xref: /qemu/linux-user/elfload.c (revision a9f495b93f1497ced94dbe51ebb733537e0fa1ab)

/* This is the Linux kernel elf-loading code, ported into user space */
#include "qemu/osdep.h"
#include <sys/param.h>

#include <sys/resource.h>
#include <sys/shm.h>

#include "qemu.h"
#include "user-internals.h"
#include "signal-common.h"
#include "loader.h"
#include "user-mmap.h"
#include "disas/disas.h"
#include "qemu/bitops.h"
#include "qemu/path.h"
#include "qemu/queue.h"
#include "qemu/guest-random.h"
#include "qemu/units.h"
#include "qemu/selfmap.h"
#include "qemu/lockable.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "target_signal.h"
#include "accel/tcg/debuginfo.h"

#ifdef _ARCH_PPC64
#undef ARCH_DLINFO
#undef ELF_PLATFORM
#undef ELF_HWCAP
#undef ELF_HWCAP2
#undef ELF_CLASS
#undef ELF_DATA
#undef ELF_ARCH
#endif

#ifndef TARGET_ARCH_HAS_SIGTRAMP_PAGE
#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 0
#endif

typedef struct {
    const uint8_t *image;
    const uint32_t *relocs;
    unsigned image_size;
    unsigned reloc_count;
    unsigned sigreturn_ofs;
    unsigned rt_sigreturn_ofs;
} VdsoImageInfo;

#define ELF_OSABI   ELFOSABI_SYSV

/* from personality.h */

/*
 * Flags for bug emulation.
 *
 * These occupy the top three bytes.
 */
enum {
    ADDR_NO_RANDOMIZE = 0x0040000,      /* disable randomization of VA space */
    FDPIC_FUNCPTRS =    0x0080000,      /* userspace function ptrs point to
                                           descriptors (signal handling) */
    MMAP_PAGE_ZERO =    0x0100000,
    ADDR_COMPAT_LAYOUT = 0x0200000,
    READ_IMPLIES_EXEC = 0x0400000,
    ADDR_LIMIT_32BIT =  0x0800000,
    SHORT_INODE =       0x1000000,
    WHOLE_SECONDS =     0x2000000,
    STICKY_TIMEOUTS =   0x4000000,
    ADDR_LIMIT_3GB =    0x8000000,
};

/*
 * Personality types.
 *
 * These go in the low byte.  Avoid using the top bit, it will
 * conflict with error returns.
 */
enum {
    PER_LINUX =         0x0000,
    PER_LINUX_32BIT =   0x0000 | ADDR_LIMIT_32BIT,
    PER_LINUX_FDPIC =   0x0000 | FDPIC_FUNCPTRS,
    PER_SVR4 =          0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
    PER_SVR3 =          0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
    PER_SCOSVR3 =       0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS | SHORT_INODE,
    PER_OSR5 =          0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
    PER_WYSEV386 =      0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
    PER_ISCR4 =         0x0005 | STICKY_TIMEOUTS,
    PER_BSD =           0x0006,
    PER_SUNOS =         0x0006 | STICKY_TIMEOUTS,
    PER_XENIX =         0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
    PER_LINUX32 =       0x0008,
    PER_LINUX32_3GB =   0x0008 | ADDR_LIMIT_3GB,
    PER_IRIX32 =        0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
    PER_IRIXN32 =       0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
    PER_IRIX64 =        0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
    PER_RISCOS =        0x000c,
    PER_SOLARIS =       0x000d | STICKY_TIMEOUTS,
    PER_UW7 =           0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
    PER_OSF4 =          0x000f,                  /* OSF/1 v4 */
    PER_HPUX =          0x0010,
    PER_MASK =          0x00ff,
};

/*
 * Return the base personality without flags.
 */
#define personality(pers)       (pers & PER_MASK)

int info_is_fdpic(struct image_info *info)
{
    return info->personality == PER_LINUX_FDPIC;
}

/* this flag is uneffective under linux too, should be deleted */
#ifndef MAP_DENYWRITE
#define MAP_DENYWRITE 0
#endif

/* should probably go in elf.h */
#ifndef ELIBBAD
#define ELIBBAD 80
#endif

#if TARGET_BIG_ENDIAN
#define ELF_DATA        ELFDATA2MSB
#else
#define ELF_DATA        ELFDATA2LSB
#endif

#ifdef TARGET_ABI_MIPSN32
typedef abi_ullong      target_elf_greg_t;
#define tswapreg(ptr)   tswap64(ptr)
#else
typedef abi_ulong       target_elf_greg_t;
#define tswapreg(ptr)   tswapal(ptr)
#endif

#ifdef USE_UID16
typedef abi_ushort      target_uid_t;
typedef abi_ushort      target_gid_t;
#else
typedef abi_uint        target_uid_t;
typedef abi_uint        target_gid_t;
#endif
typedef abi_int         target_pid_t;

#ifdef TARGET_I386

#define ELF_HWCAP get_elf_hwcap()

static uint32_t get_elf_hwcap(void)
{
    X86CPU *cpu = X86_CPU(thread_cpu);

    return cpu->env.features[FEAT_1_EDX];
}

#ifdef TARGET_X86_64
#define ELF_CLASS      ELFCLASS64
#define ELF_ARCH       EM_X86_64

#define ELF_PLATFORM   "x86_64"

static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
    regs->rax = 0;
    regs->rsp = infop->start_stack;
    regs->rip = infop->entry;
}

#define ELF_NREG    27
typedef target_elf_greg_t  target_elf_gregset_t[ELF_NREG];

/*
 * Note that ELF_NREG should be 29 as there should be place for
 * TRAPNO and ERR "registers" as well but linux doesn't dump
 * those.
 *
 * See linux kernel: arch/x86/include/asm/elf.h
 */
static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
{
    (*regs)[0] = tswapreg(env->regs[15]);
    (*regs)[1] = tswapreg(env->regs[14]);
    (*regs)[2] = tswapreg(env->regs[13]);
    (*regs)[3] = tswapreg(env->regs[12]);
    (*regs)[4] = tswapreg(env->regs[R_EBP]);
    (*regs)[5] = tswapreg(env->regs[R_EBX]);
    (*regs)[6] = tswapreg(env->regs[11]);
    (*regs)[7] = tswapreg(env->regs[10]);
    (*regs)[8] = tswapreg(env->regs[9]);
    (*regs)[9] = tswapreg(env->regs[8]);
    (*regs)[10] = tswapreg(env->regs[R_EAX]);
    (*regs)[11] = tswapreg(env->regs[R_ECX]);
    (*regs)[12] = tswapreg(env->regs[R_EDX]);
    (*regs)[13] = tswapreg(env->regs[R_ESI]);
    (*regs)[14] = tswapreg(env->regs[R_EDI]);
    (*regs)[15] = tswapreg(env->regs[R_EAX]); /* XXX */
    (*regs)[16] = tswapreg(env->eip);
    (*regs)[17] = tswapreg(env->segs[R_CS].selector & 0xffff);
    (*regs)[18] = tswapreg(env->eflags);
    (*regs)[19] = tswapreg(env->regs[R_ESP]);
    (*regs)[20] = tswapreg(env->segs[R_SS].selector & 0xffff);
    (*regs)[21] = tswapreg(env->segs[R_FS].selector & 0xffff);
    (*regs)[22] = tswapreg(env->segs[R_GS].selector & 0xffff);
    (*regs)[23] = tswapreg(env->segs[R_DS].selector & 0xffff);
    (*regs)[24] = tswapreg(env->segs[R_ES].selector & 0xffff);
    (*regs)[25] = tswapreg(env->segs[R_FS].selector & 0xffff);
    (*regs)[26] = tswapreg(env->segs[R_GS].selector & 0xffff);
}

#if ULONG_MAX > UINT32_MAX
#define INIT_GUEST_COMMPAGE
static bool init_guest_commpage(void)
{
    /*
     * The vsyscall page is at a high negative address aka kernel space,
     * which means that we cannot actually allocate it with target_mmap.
     * We still should be able to use page_set_flags, unless the user
     * has specified -R reserved_va, which would trigger an assert().
     */
    if (reserved_va != 0 &&
        TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE - 1 > reserved_va) {
        error_report("Cannot allocate vsyscall page");
        exit(EXIT_FAILURE);
    }
    page_set_flags(TARGET_VSYSCALL_PAGE,
                   TARGET_VSYSCALL_PAGE | ~TARGET_PAGE_MASK,
                   PAGE_EXEC | PAGE_VALID);
    return true;
}
#endif
#else

/*
 * This is used to ensure we don't load something for the wrong architecture.
 */
#define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )

/*
 * These are used to set parameters in the core dumps.
 */
#define ELF_CLASS       ELFCLASS32
#define ELF_ARCH        EM_386

#define ELF_PLATFORM get_elf_platform()
#define EXSTACK_DEFAULT true

static const char *get_elf_platform(void)
{
    static char elf_platform[] = "i386";
    int family = object_property_get_int(OBJECT(thread_cpu), "family", NULL);
    if (family > 6) {
        family = 6;
    }
    if (family >= 3) {
        elf_platform[1] = '0' + family;
    }
    return elf_platform;
}

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    regs->esp = infop->start_stack;
    regs->eip = infop->entry;

    /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
       starts %edx contains a pointer to a function which might be
       registered using `atexit'.  This provides a mean for the
       dynamic linker to call DT_FINI functions for shared libraries
       that have been loaded before the code runs.

       A value of 0 tells we have no such handler.  */
    regs->edx = 0;
}

#define ELF_NREG    17
typedef target_elf_greg_t  target_elf_gregset_t[ELF_NREG];

/*
 * Note that ELF_NREG should be 19 as there should be place for
 * TRAPNO and ERR "registers" as well but linux doesn't dump
 * those.
 *
 * See linux kernel: arch/x86/include/asm/elf.h
 */
static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
{
    (*regs)[0] = tswapreg(env->regs[R_EBX]);
    (*regs)[1] = tswapreg(env->regs[R_ECX]);
    (*regs)[2] = tswapreg(env->regs[R_EDX]);
    (*regs)[3] = tswapreg(env->regs[R_ESI]);
    (*regs)[4] = tswapreg(env->regs[R_EDI]);
    (*regs)[5] = tswapreg(env->regs[R_EBP]);
    (*regs)[6] = tswapreg(env->regs[R_EAX]);
    (*regs)[7] = tswapreg(env->segs[R_DS].selector & 0xffff);
    (*regs)[8] = tswapreg(env->segs[R_ES].selector & 0xffff);
    (*regs)[9] = tswapreg(env->segs[R_FS].selector & 0xffff);
    (*regs)[10] = tswapreg(env->segs[R_GS].selector & 0xffff);
    (*regs)[11] = tswapreg(env->regs[R_EAX]); /* XXX */
    (*regs)[12] = tswapreg(env->eip);
    (*regs)[13] = tswapreg(env->segs[R_CS].selector & 0xffff);
    (*regs)[14] = tswapreg(env->eflags);
    (*regs)[15] = tswapreg(env->regs[R_ESP]);
    (*regs)[16] = tswapreg(env->segs[R_SS].selector & 0xffff);
}

/*
 * i386 is the only target which supplies AT_SYSINFO for the vdso.
 * All others only supply AT_SYSINFO_EHDR.
 */
#define DLINFO_ARCH_ITEMS (vdso_info != NULL)
#define ARCH_DLINFO                                     \
    do {                                                \
        if (vdso_info) {                                \
            NEW_AUX_ENT(AT_SYSINFO, vdso_info->entry);  \
        }                                               \
    } while (0)

#endif /* TARGET_X86_64 */

#define VDSO_HEADER "vdso.c.inc"

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE       4096

#endif /* TARGET_I386 */

#ifdef TARGET_ARM

#ifndef TARGET_AARCH64
/* 32 bit ARM definitions */

#define ELF_ARCH        EM_ARM
#define ELF_CLASS       ELFCLASS32
#define EXSTACK_DEFAULT true

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    abi_long stack = infop->start_stack;
    memset(regs, 0, sizeof(*regs));

    regs->uregs[16] = ARM_CPU_MODE_USR;
    if (infop->entry & 1) {
        regs->uregs[16] |= CPSR_T;
    }
    regs->uregs[15] = infop->entry & 0xfffffffe;
    regs->uregs[13] = infop->start_stack;
    /* FIXME - what to for failure of get_user()? */
    get_user_ual(regs->uregs[2], stack + 8); /* envp */
    get_user_ual(regs->uregs[1], stack + 4); /* envp */
    /* XXX: it seems that r0 is zeroed after ! */
    regs->uregs[0] = 0;
    /* For uClinux PIC binaries.  */
    /* XXX: Linux does this only on ARM with no MMU (do we care ?) */
    regs->uregs[10] = infop->start_data;

    /* Support ARM FDPIC.  */
    if (info_is_fdpic(infop)) {
        /* As described in the ABI document, r7 points to the loadmap info
         * prepared by the kernel. If an interpreter is needed, r8 points
         * to the interpreter loadmap and r9 points to the interpreter
         * PT_DYNAMIC info. If no interpreter is needed, r8 is zero, and
         * r9 points to the main program PT_DYNAMIC info.
         */
        regs->uregs[7] = infop->loadmap_addr;
        if (infop->interpreter_loadmap_addr) {
            /* Executable is dynamically loaded.  */
            regs->uregs[8] = infop->interpreter_loadmap_addr;
            regs->uregs[9] = infop->interpreter_pt_dynamic_addr;
        } else {
            regs->uregs[8] = 0;
            regs->uregs[9] = infop->pt_dynamic_addr;
        }
    }
}

#define ELF_NREG    18
typedef target_elf_greg_t  target_elf_gregset_t[ELF_NREG];

static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUARMState *env)
{
    (*regs)[0] = tswapreg(env->regs[0]);
    (*regs)[1] = tswapreg(env->regs[1]);
    (*regs)[2] = tswapreg(env->regs[2]);
    (*regs)[3] = tswapreg(env->regs[3]);
    (*regs)[4] = tswapreg(env->regs[4]);
    (*regs)[5] = tswapreg(env->regs[5]);
    (*regs)[6] = tswapreg(env->regs[6]);
    (*regs)[7] = tswapreg(env->regs[7]);
    (*regs)[8] = tswapreg(env->regs[8]);
    (*regs)[9] = tswapreg(env->regs[9]);
    (*regs)[10] = tswapreg(env->regs[10]);
    (*regs)[11] = tswapreg(env->regs[11]);
    (*regs)[12] = tswapreg(env->regs[12]);
    (*regs)[13] = tswapreg(env->regs[13]);
    (*regs)[14] = tswapreg(env->regs[14]);
    (*regs)[15] = tswapreg(env->regs[15]);

    (*regs)[16] = tswapreg(cpsr_read((CPUARMState *)env));
    (*regs)[17] = tswapreg(env->regs[0]); /* XXX */
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE       4096

enum
{
    ARM_HWCAP_ARM_SWP       = 1 << 0,
    ARM_HWCAP_ARM_HALF      = 1 << 1,
    ARM_HWCAP_ARM_THUMB     = 1 << 2,
    ARM_HWCAP_ARM_26BIT     = 1 << 3,
    ARM_HWCAP_ARM_FAST_MULT = 1 << 4,
    ARM_HWCAP_ARM_FPA       = 1 << 5,
    ARM_HWCAP_ARM_VFP       = 1 << 6,
    ARM_HWCAP_ARM_EDSP      = 1 << 7,
    ARM_HWCAP_ARM_JAVA      = 1 << 8,
    ARM_HWCAP_ARM_IWMMXT    = 1 << 9,
    ARM_HWCAP_ARM_CRUNCH    = 1 << 10,
    ARM_HWCAP_ARM_THUMBEE   = 1 << 11,
    ARM_HWCAP_ARM_NEON      = 1 << 12,
    ARM_HWCAP_ARM_VFPv3     = 1 << 13,
    ARM_HWCAP_ARM_VFPv3D16  = 1 << 14,
    ARM_HWCAP_ARM_TLS       = 1 << 15,
    ARM_HWCAP_ARM_VFPv4     = 1 << 16,
    ARM_HWCAP_ARM_IDIVA     = 1 << 17,
    ARM_HWCAP_ARM_IDIVT     = 1 << 18,
    ARM_HWCAP_ARM_VFPD32    = 1 << 19,
    ARM_HWCAP_ARM_LPAE      = 1 << 20,
    ARM_HWCAP_ARM_EVTSTRM   = 1 << 21,
    ARM_HWCAP_ARM_FPHP      = 1 << 22,
    ARM_HWCAP_ARM_ASIMDHP   = 1 << 23,
    ARM_HWCAP_ARM_ASIMDDP   = 1 << 24,
    ARM_HWCAP_ARM_ASIMDFHM  = 1 << 25,
    ARM_HWCAP_ARM_ASIMDBF16 = 1 << 26,
    ARM_HWCAP_ARM_I8MM      = 1 << 27,
};

enum {
    ARM_HWCAP2_ARM_AES      = 1 << 0,
    ARM_HWCAP2_ARM_PMULL    = 1 << 1,
    ARM_HWCAP2_ARM_SHA1     = 1 << 2,
    ARM_HWCAP2_ARM_SHA2     = 1 << 3,
    ARM_HWCAP2_ARM_CRC32    = 1 << 4,
    ARM_HWCAP2_ARM_SB       = 1 << 5,
    ARM_HWCAP2_ARM_SSBS     = 1 << 6,
};

/* The commpage only exists for 32 bit kernels */

#define HI_COMMPAGE (intptr_t)0xffff0f00u

static bool init_guest_commpage(void)
{
    ARMCPU *cpu = ARM_CPU(thread_cpu);
    abi_ptr commpage;
    void *want;
    void *addr;

    /*
     * M-profile allocates maximum of 2GB address space, so can never
     * allocate the commpage.  Skip it.
     */
    if (arm_feature(&cpu->env, ARM_FEATURE_M)) {
        return true;
    }

    commpage = HI_COMMPAGE & -qemu_host_page_size;
    want = g2h_untagged(commpage);
    addr = mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE,
                MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);

    if (addr == MAP_FAILED) {
        perror("Allocating guest commpage");
        exit(EXIT_FAILURE);
    }
    if (addr != want) {
        return false;
    }

    /* Set kernel helper versions; rest of page is 0.  */
    __put_user(5, (uint32_t *)g2h_untagged(0xffff0ffcu));

    if (mprotect(addr, qemu_host_page_size, PROT_READ)) {
        perror("Protecting guest commpage");
        exit(EXIT_FAILURE);
    }

    page_set_flags(commpage, commpage | ~qemu_host_page_mask,
                   PAGE_READ | PAGE_EXEC | PAGE_VALID);
    return true;
}

#define ELF_HWCAP get_elf_hwcap()
#define ELF_HWCAP2 get_elf_hwcap2()

uint32_t get_elf_hwcap(void)
{
    ARMCPU *cpu = ARM_CPU(thread_cpu);
    uint32_t hwcaps = 0;

    hwcaps |= ARM_HWCAP_ARM_SWP;
    hwcaps |= ARM_HWCAP_ARM_HALF;
    hwcaps |= ARM_HWCAP_ARM_THUMB;
    hwcaps |= ARM_HWCAP_ARM_FAST_MULT;

    /* probe for the extra features */
#define GET_FEATURE(feat, hwcap) \
    do { if (arm_feature(&cpu->env, feat)) { hwcaps |= hwcap; } } while (0)

#define GET_FEATURE_ID(feat, hwcap) \
    do { if (cpu_isar_feature(feat, cpu)) { hwcaps |= hwcap; } } while (0)

    /* EDSP is in v5TE and above, but all our v5 CPUs are v5TE */
    GET_FEATURE(ARM_FEATURE_V5, ARM_HWCAP_ARM_EDSP);
    GET_FEATURE(ARM_FEATURE_IWMMXT, ARM_HWCAP_ARM_IWMMXT);
    GET_FEATURE(ARM_FEATURE_THUMB2EE, ARM_HWCAP_ARM_THUMBEE);
    GET_FEATURE(ARM_FEATURE_NEON, ARM_HWCAP_ARM_NEON);
    GET_FEATURE(ARM_FEATURE_V6K, ARM_HWCAP_ARM_TLS);
    GET_FEATURE(ARM_FEATURE_LPAE, ARM_HWCAP_ARM_LPAE);
    GET_FEATURE_ID(aa32_arm_div, ARM_HWCAP_ARM_IDIVA);
    GET_FEATURE_ID(aa32_thumb_div, ARM_HWCAP_ARM_IDIVT);
    GET_FEATURE_ID(aa32_vfp, ARM_HWCAP_ARM_VFP);

    if (cpu_isar_feature(aa32_fpsp_v3, cpu) ||
        cpu_isar_feature(aa32_fpdp_v3, cpu)) {
        hwcaps |= ARM_HWCAP_ARM_VFPv3;
        if (cpu_isar_feature(aa32_simd_r32, cpu)) {
            hwcaps |= ARM_HWCAP_ARM_VFPD32;
        } else {
            hwcaps |= ARM_HWCAP_ARM_VFPv3D16;
        }
    }
    GET_FEATURE_ID(aa32_simdfmac, ARM_HWCAP_ARM_VFPv4);
    /*
     * MVFR1.FPHP and .SIMDHP must be in sync, and QEMU uses the same
     * isar_feature function for both. The kernel reports them as two hwcaps.
     */
    GET_FEATURE_ID(aa32_fp16_arith, ARM_HWCAP_ARM_FPHP);
    GET_FEATURE_ID(aa32_fp16_arith, ARM_HWCAP_ARM_ASIMDHP);
    GET_FEATURE_ID(aa32_dp, ARM_HWCAP_ARM_ASIMDDP);
    GET_FEATURE_ID(aa32_fhm, ARM_HWCAP_ARM_ASIMDFHM);
    GET_FEATURE_ID(aa32_bf16, ARM_HWCAP_ARM_ASIMDBF16);
    GET_FEATURE_ID(aa32_i8mm, ARM_HWCAP_ARM_I8MM);

    return hwcaps;
}

uint32_t get_elf_hwcap2(void)
{
    ARMCPU *cpu = ARM_CPU(thread_cpu);
    uint32_t hwcaps = 0;

    GET_FEATURE_ID(aa32_aes, ARM_HWCAP2_ARM_AES);
    GET_FEATURE_ID(aa32_pmull, ARM_HWCAP2_ARM_PMULL);
    GET_FEATURE_ID(aa32_sha1, ARM_HWCAP2_ARM_SHA1);
    GET_FEATURE_ID(aa32_sha2, ARM_HWCAP2_ARM_SHA2);
    GET_FEATURE_ID(aa32_crc32, ARM_HWCAP2_ARM_CRC32);
    GET_FEATURE_ID(aa32_sb, ARM_HWCAP2_ARM_SB);
    GET_FEATURE_ID(aa32_ssbs, ARM_HWCAP2_ARM_SSBS);
    return hwcaps;
}

const char *elf_hwcap_str(uint32_t bit)
{
    static const char *hwcap_str[] = {
    [__builtin_ctz(ARM_HWCAP_ARM_SWP      )] = "swp",
    [__builtin_ctz(ARM_HWCAP_ARM_HALF     )] = "half",
    [__builtin_ctz(ARM_HWCAP_ARM_THUMB    )] = "thumb",
    [__builtin_ctz(ARM_HWCAP_ARM_26BIT    )] = "26bit",
    [__builtin_ctz(ARM_HWCAP_ARM_FAST_MULT)] = "fast_mult",
    [__builtin_ctz(ARM_HWCAP_ARM_FPA      )] = "fpa",
    [__builtin_ctz(ARM_HWCAP_ARM_VFP      )] = "vfp",
    [__builtin_ctz(ARM_HWCAP_ARM_EDSP     )] = "edsp",
    [__builtin_ctz(ARM_HWCAP_ARM_JAVA     )] = "java",
    [__builtin_ctz(ARM_HWCAP_ARM_IWMMXT   )] = "iwmmxt",
    [__builtin_ctz(ARM_HWCAP_ARM_CRUNCH   )] = "crunch",
    [__builtin_ctz(ARM_HWCAP_ARM_THUMBEE  )] = "thumbee",
    [__builtin_ctz(ARM_HWCAP_ARM_NEON     )] = "neon",
    [__builtin_ctz(ARM_HWCAP_ARM_VFPv3    )] = "vfpv3",
    [__builtin_ctz(ARM_HWCAP_ARM_VFPv3D16 )] = "vfpv3d16",
    [__builtin_ctz(ARM_HWCAP_ARM_TLS      )] = "tls",
    [__builtin_ctz(ARM_HWCAP_ARM_VFPv4    )] = "vfpv4",
    [__builtin_ctz(ARM_HWCAP_ARM_IDIVA    )] = "idiva",
    [__builtin_ctz(ARM_HWCAP_ARM_IDIVT    )] = "idivt",
    [__builtin_ctz(ARM_HWCAP_ARM_VFPD32   )] = "vfpd32",
    [__builtin_ctz(ARM_HWCAP_ARM_LPAE     )] = "lpae",
    [__builtin_ctz(ARM_HWCAP_ARM_EVTSTRM  )] = "evtstrm",
    [__builtin_ctz(ARM_HWCAP_ARM_FPHP     )] = "fphp",
    [__builtin_ctz(ARM_HWCAP_ARM_ASIMDHP  )] = "asimdhp",
    [__builtin_ctz(ARM_HWCAP_ARM_ASIMDDP  )] = "asimddp",
    [__builtin_ctz(ARM_HWCAP_ARM_ASIMDFHM )] = "asimdfhm",
    [__builtin_ctz(ARM_HWCAP_ARM_ASIMDBF16)] = "asimdbf16",
    [__builtin_ctz(ARM_HWCAP_ARM_I8MM     )] = "i8mm",
    };

    return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
}

const char *elf_hwcap2_str(uint32_t bit)
{
    static const char *hwcap_str[] = {
    [__builtin_ctz(ARM_HWCAP2_ARM_AES  )] = "aes",
    [__builtin_ctz(ARM_HWCAP2_ARM_PMULL)] = "pmull",
    [__builtin_ctz(ARM_HWCAP2_ARM_SHA1 )] = "sha1",
    [__builtin_ctz(ARM_HWCAP2_ARM_SHA2 )] = "sha2",
    [__builtin_ctz(ARM_HWCAP2_ARM_CRC32)] = "crc32",
    [__builtin_ctz(ARM_HWCAP2_ARM_SB   )] = "sb",
    [__builtin_ctz(ARM_HWCAP2_ARM_SSBS )] = "ssbs",
    };

    return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
}

#undef GET_FEATURE
#undef GET_FEATURE_ID

#define ELF_PLATFORM get_elf_platform()

static const char *get_elf_platform(void)
{
    CPUARMState *env = cpu_env(thread_cpu);

#if TARGET_BIG_ENDIAN
# define END  "b"
#else
# define END  "l"
#endif

    if (arm_feature(env, ARM_FEATURE_V8)) {
        return "v8" END;
    } else if (arm_feature(env, ARM_FEATURE_V7)) {
        if (arm_feature(env, ARM_FEATURE_M)) {
            return "v7m" END;
        } else {
            return "v7" END;
        }
    } else if (arm_feature(env, ARM_FEATURE_V6)) {
        return "v6" END;
    } else if (arm_feature(env, ARM_FEATURE_V5)) {
        return "v5" END;
    } else {
        return "v4" END;
    }

#undef END
}

#else
/* 64 bit ARM definitions */

#define ELF_ARCH        EM_AARCH64
#define ELF_CLASS       ELFCLASS64
#if TARGET_BIG_ENDIAN
# define ELF_PLATFORM    "aarch64_be"
#else
# define ELF_PLATFORM    "aarch64"
#endif

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    abi_long stack = infop->start_stack;
    memset(regs, 0, sizeof(*regs));

    regs->pc = infop->entry & ~0x3ULL;
    regs->sp = stack;
}

#define ELF_NREG    34
typedef target_elf_greg_t  target_elf_gregset_t[ELF_NREG];

static void elf_core_copy_regs(target_elf_gregset_t *regs,
                               const CPUARMState *env)
{
    int i;

    for (i = 0; i < 32; i++) {
        (*regs)[i] = tswapreg(env->xregs[i]);
    }
    (*regs)[32] = tswapreg(env->pc);
    (*regs)[33] = tswapreg(pstate_read((CPUARMState *)env));
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE       4096

enum {
    ARM_HWCAP_A64_FP            = 1 << 0,
    ARM_HWCAP_A64_ASIMD         = 1 << 1,
    ARM_HWCAP_A64_EVTSTRM       = 1 << 2,
    ARM_HWCAP_A64_AES           = 1 << 3,
    ARM_HWCAP_A64_PMULL         = 1 << 4,
    ARM_HWCAP_A64_SHA1          = 1 << 5,
    ARM_HWCAP_A64_SHA2          = 1 << 6,
    ARM_HWCAP_A64_CRC32         = 1 << 7,
    ARM_HWCAP_A64_ATOMICS       = 1 << 8,
    ARM_HWCAP_A64_FPHP          = 1 << 9,
    ARM_HWCAP_A64_ASIMDHP       = 1 << 10,
    ARM_HWCAP_A64_CPUID         = 1 << 11,
    ARM_HWCAP_A64_ASIMDRDM      = 1 << 12,
    ARM_HWCAP_A64_JSCVT         = 1 << 13,
    ARM_HWCAP_A64_FCMA          = 1 << 14,
    ARM_HWCAP_A64_LRCPC         = 1 << 15,
    ARM_HWCAP_A64_DCPOP         = 1 << 16,
    ARM_HWCAP_A64_SHA3          = 1 << 17,
    ARM_HWCAP_A64_SM3           = 1 << 18,
    ARM_HWCAP_A64_SM4           = 1 << 19,
    ARM_HWCAP_A64_ASIMDDP       = 1 << 20,
    ARM_HWCAP_A64_SHA512        = 1 << 21,
    ARM_HWCAP_A64_SVE           = 1 << 22,
    ARM_HWCAP_A64_ASIMDFHM      = 1 << 23,
    ARM_HWCAP_A64_DIT           = 1 << 24,
    ARM_HWCAP_A64_USCAT         = 1 << 25,
    ARM_HWCAP_A64_ILRCPC        = 1 << 26,
    ARM_HWCAP_A64_FLAGM         = 1 << 27,
    ARM_HWCAP_A64_SSBS          = 1 << 28,
    ARM_HWCAP_A64_SB            = 1 << 29,
    ARM_HWCAP_A64_PACA          = 1 << 30,
    ARM_HWCAP_A64_PACG          = 1UL << 31,

    ARM_HWCAP2_A64_DCPODP       = 1 << 0,
    ARM_HWCAP2_A64_SVE2         = 1 << 1,
    ARM_HWCAP2_A64_SVEAES       = 1 << 2,
    ARM_HWCAP2_A64_SVEPMULL     = 1 << 3,
    ARM_HWCAP2_A64_SVEBITPERM   = 1 << 4,
    ARM_HWCAP2_A64_SVESHA3      = 1 << 5,
    ARM_HWCAP2_A64_SVESM4       = 1 << 6,
    ARM_HWCAP2_A64_FLAGM2       = 1 << 7,
    ARM_HWCAP2_A64_FRINT        = 1 << 8,
    ARM_HWCAP2_A64_SVEI8MM      = 1 << 9,
    ARM_HWCAP2_A64_SVEF32MM     = 1 << 10,
    ARM_HWCAP2_A64_SVEF64MM     = 1 << 11,
    ARM_HWCAP2_A64_SVEBF16      = 1 << 12,
    ARM_HWCAP2_A64_I8MM         = 1 << 13,
    ARM_HWCAP2_A64_BF16         = 1 << 14,
    ARM_HWCAP2_A64_DGH          = 1 << 15,
    ARM_HWCAP2_A64_RNG          = 1 << 16,
    ARM_HWCAP2_A64_BTI          = 1 << 17,
    ARM_HWCAP2_A64_MTE          = 1 << 18,
    ARM_HWCAP2_A64_ECV          = 1 << 19,
    ARM_HWCAP2_A64_AFP          = 1 << 20,
    ARM_HWCAP2_A64_RPRES        = 1 << 21,
    ARM_HWCAP2_A64_MTE3         = 1 << 22,
    ARM_HWCAP2_A64_SME          = 1 << 23,
    ARM_HWCAP2_A64_SME_I16I64   = 1 << 24,
    ARM_HWCAP2_A64_SME_F64F64   = 1 << 25,
    ARM_HWCAP2_A64_SME_I8I32    = 1 << 26,
    ARM_HWCAP2_A64_SME_F16F32   = 1 << 27,
    ARM_HWCAP2_A64_SME_B16F32   = 1 << 28,
    ARM_HWCAP2_A64_SME_F32F32   = 1 << 29,
    ARM_HWCAP2_A64_SME_FA64     = 1 << 30,
    ARM_HWCAP2_A64_WFXT         = 1ULL << 31,
    ARM_HWCAP2_A64_EBF16        = 1ULL << 32,
    ARM_HWCAP2_A64_SVE_EBF16    = 1ULL << 33,
    ARM_HWCAP2_A64_CSSC         = 1ULL << 34,
    ARM_HWCAP2_A64_RPRFM        = 1ULL << 35,
    ARM_HWCAP2_A64_SVE2P1       = 1ULL << 36,
    ARM_HWCAP2_A64_SME2         = 1ULL << 37,
    ARM_HWCAP2_A64_SME2P1       = 1ULL << 38,
    ARM_HWCAP2_A64_SME_I16I32   = 1ULL << 39,
    ARM_HWCAP2_A64_SME_BI32I32  = 1ULL << 40,
    ARM_HWCAP2_A64_SME_B16B16   = 1ULL << 41,
    ARM_HWCAP2_A64_SME_F16F16   = 1ULL << 42,
    ARM_HWCAP2_A64_MOPS         = 1ULL << 43,
    ARM_HWCAP2_A64_HBC          = 1ULL << 44,
};

#define ELF_HWCAP   get_elf_hwcap()
#define ELF_HWCAP2  get_elf_hwcap2()

#define GET_FEATURE_ID(feat, hwcap) \
    do { if (cpu_isar_feature(feat, cpu)) { hwcaps |= hwcap; } } while (0)

uint32_t get_elf_hwcap(void)
{
    ARMCPU *cpu = ARM_CPU(thread_cpu);
    uint32_t hwcaps = 0;

    hwcaps |= ARM_HWCAP_A64_FP;
    hwcaps |= ARM_HWCAP_A64_ASIMD;
    hwcaps |= ARM_HWCAP_A64_CPUID;

    /* probe for the extra features */

    GET_FEATURE_ID(aa64_aes, ARM_HWCAP_A64_AES);
    GET_FEATURE_ID(aa64_pmull, ARM_HWCAP_A64_PMULL);
    GET_FEATURE_ID(aa64_sha1, ARM_HWCAP_A64_SHA1);
    GET_FEATURE_ID(aa64_sha256, ARM_HWCAP_A64_SHA2);
    GET_FEATURE_ID(aa64_sha512, ARM_HWCAP_A64_SHA512);
    GET_FEATURE_ID(aa64_crc32, ARM_HWCAP_A64_CRC32);
    GET_FEATURE_ID(aa64_sha3, ARM_HWCAP_A64_SHA3);
    GET_FEATURE_ID(aa64_sm3, ARM_HWCAP_A64_SM3);
    GET_FEATURE_ID(aa64_sm4, ARM_HWCAP_A64_SM4);
    GET_FEATURE_ID(aa64_fp16, ARM_HWCAP_A64_FPHP | ARM_HWCAP_A64_ASIMDHP);
    GET_FEATURE_ID(aa64_atomics, ARM_HWCAP_A64_ATOMICS);
    GET_FEATURE_ID(aa64_rdm, ARM_HWCAP_A64_ASIMDRDM);
    GET_FEATURE_ID(aa64_dp, ARM_HWCAP_A64_ASIMDDP);
    GET_FEATURE_ID(aa64_fcma, ARM_HWCAP_A64_FCMA);
    GET_FEATURE_ID(aa64_sve, ARM_HWCAP_A64_SVE);
    GET_FEATURE_ID(aa64_pauth, ARM_HWCAP_A64_PACA | ARM_HWCAP_A64_PACG);
    GET_FEATURE_ID(aa64_fhm, ARM_HWCAP_A64_ASIMDFHM);
    GET_FEATURE_ID(aa64_jscvt, ARM_HWCAP_A64_JSCVT);
    GET_FEATURE_ID(aa64_sb, ARM_HWCAP_A64_SB);
    GET_FEATURE_ID(aa64_condm_4, ARM_HWCAP_A64_FLAGM);
    GET_FEATURE_ID(aa64_dcpop, ARM_HWCAP_A64_DCPOP);
    GET_FEATURE_ID(aa64_rcpc_8_3, ARM_HWCAP_A64_LRCPC);
    GET_FEATURE_ID(aa64_rcpc_8_4, ARM_HWCAP_A64_ILRCPC);

    return hwcaps;
}

uint32_t get_elf_hwcap2(void)
{
    ARMCPU *cpu = ARM_CPU(thread_cpu);
    uint32_t hwcaps = 0;

    GET_FEATURE_ID(aa64_dcpodp, ARM_HWCAP2_A64_DCPODP);
    GET_FEATURE_ID(aa64_sve2, ARM_HWCAP2_A64_SVE2);
    GET_FEATURE_ID(aa64_sve2_aes, ARM_HWCAP2_A64_SVEAES);
    GET_FEATURE_ID(aa64_sve2_pmull128, ARM_HWCAP2_A64_SVEPMULL);
    GET_FEATURE_ID(aa64_sve2_bitperm, ARM_HWCAP2_A64_SVEBITPERM);
    GET_FEATURE_ID(aa64_sve2_sha3, ARM_HWCAP2_A64_SVESHA3);
    GET_FEATURE_ID(aa64_sve2_sm4, ARM_HWCAP2_A64_SVESM4);
    GET_FEATURE_ID(aa64_condm_5, ARM_HWCAP2_A64_FLAGM2);
    GET_FEATURE_ID(aa64_frint, ARM_HWCAP2_A64_FRINT);
    GET_FEATURE_ID(aa64_sve_i8mm, ARM_HWCAP2_A64_SVEI8MM);
    GET_FEATURE_ID(aa64_sve_f32mm, ARM_HWCAP2_A64_SVEF32MM);
    GET_FEATURE_ID(aa64_sve_f64mm, ARM_HWCAP2_A64_SVEF64MM);
    GET_FEATURE_ID(aa64_sve_bf16, ARM_HWCAP2_A64_SVEBF16);
    GET_FEATURE_ID(aa64_i8mm, ARM_HWCAP2_A64_I8MM);
    GET_FEATURE_ID(aa64_bf16, ARM_HWCAP2_A64_BF16);
    GET_FEATURE_ID(aa64_rndr, ARM_HWCAP2_A64_RNG);
    GET_FEATURE_ID(aa64_bti, ARM_HWCAP2_A64_BTI);
    GET_FEATURE_ID(aa64_mte, ARM_HWCAP2_A64_MTE);
    GET_FEATURE_ID(aa64_sme, (ARM_HWCAP2_A64_SME |
                              ARM_HWCAP2_A64_SME_F32F32 |
                              ARM_HWCAP2_A64_SME_B16F32 |
                              ARM_HWCAP2_A64_SME_F16F32 |
                              ARM_HWCAP2_A64_SME_I8I32));
    GET_FEATURE_ID(aa64_sme_f64f64, ARM_HWCAP2_A64_SME_F64F64);
    GET_FEATURE_ID(aa64_sme_i16i64, ARM_HWCAP2_A64_SME_I16I64);
    GET_FEATURE_ID(aa64_sme_fa64, ARM_HWCAP2_A64_SME_FA64);
    GET_FEATURE_ID(aa64_hbc, ARM_HWCAP2_A64_HBC);
    GET_FEATURE_ID(aa64_mops, ARM_HWCAP2_A64_MOPS);

    return hwcaps;
}

const char *elf_hwcap_str(uint32_t bit)
{
    static const char *hwcap_str[] = {
    [__builtin_ctz(ARM_HWCAP_A64_FP      )] = "fp",
    [__builtin_ctz(ARM_HWCAP_A64_ASIMD   )] = "asimd",
    [__builtin_ctz(ARM_HWCAP_A64_EVTSTRM )] = "evtstrm",
    [__builtin_ctz(ARM_HWCAP_A64_AES     )] = "aes",
    [__builtin_ctz(ARM_HWCAP_A64_PMULL   )] = "pmull",
    [__builtin_ctz(ARM_HWCAP_A64_SHA1    )] = "sha1",
    [__builtin_ctz(ARM_HWCAP_A64_SHA2    )] = "sha2",
    [__builtin_ctz(ARM_HWCAP_A64_CRC32   )] = "crc32",
    [__builtin_ctz(ARM_HWCAP_A64_ATOMICS )] = "atomics",
    [__builtin_ctz(ARM_HWCAP_A64_FPHP    )] = "fphp",
    [__builtin_ctz(ARM_HWCAP_A64_ASIMDHP )] = "asimdhp",
    [__builtin_ctz(ARM_HWCAP_A64_CPUID   )] = "cpuid",
    [__builtin_ctz(ARM_HWCAP_A64_ASIMDRDM)] = "asimdrdm",
    [__builtin_ctz(ARM_HWCAP_A64_JSCVT   )] = "jscvt",
    [__builtin_ctz(ARM_HWCAP_A64_FCMA    )] = "fcma",
    [__builtin_ctz(ARM_HWCAP_A64_LRCPC   )] = "lrcpc",
    [__builtin_ctz(ARM_HWCAP_A64_DCPOP   )] = "dcpop",
    [__builtin_ctz(ARM_HWCAP_A64_SHA3    )] = "sha3",
    [__builtin_ctz(ARM_HWCAP_A64_SM3     )] = "sm3",
    [__builtin_ctz(ARM_HWCAP_A64_SM4     )] = "sm4",
    [__builtin_ctz(ARM_HWCAP_A64_ASIMDDP )] = "asimddp",
    [__builtin_ctz(ARM_HWCAP_A64_SHA512  )] = "sha512",
    [__builtin_ctz(ARM_HWCAP_A64_SVE     )] = "sve",
    [__builtin_ctz(ARM_HWCAP_A64_ASIMDFHM)] = "asimdfhm",
    [__builtin_ctz(ARM_HWCAP_A64_DIT     )] = "dit",
    [__builtin_ctz(ARM_HWCAP_A64_USCAT   )] = "uscat",
    [__builtin_ctz(ARM_HWCAP_A64_ILRCPC  )] = "ilrcpc",
    [__builtin_ctz(ARM_HWCAP_A64_FLAGM   )] = "flagm",
    [__builtin_ctz(ARM_HWCAP_A64_SSBS    )] = "ssbs",
    [__builtin_ctz(ARM_HWCAP_A64_SB      )] = "sb",
    [__builtin_ctz(ARM_HWCAP_A64_PACA    )] = "paca",
    [__builtin_ctz(ARM_HWCAP_A64_PACG    )] = "pacg",
    };

    return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
}

const char *elf_hwcap2_str(uint32_t bit)
{
    static const char *hwcap_str[] = {
    [__builtin_ctz(ARM_HWCAP2_A64_DCPODP       )] = "dcpodp",
    [__builtin_ctz(ARM_HWCAP2_A64_SVE2         )] = "sve2",
    [__builtin_ctz(ARM_HWCAP2_A64_SVEAES       )] = "sveaes",
    [__builtin_ctz(ARM_HWCAP2_A64_SVEPMULL     )] = "svepmull",
    [__builtin_ctz(ARM_HWCAP2_A64_SVEBITPERM   )] = "svebitperm",
    [__builtin_ctz(ARM_HWCAP2_A64_SVESHA3      )] = "svesha3",
    [__builtin_ctz(ARM_HWCAP2_A64_SVESM4       )] = "svesm4",
    [__builtin_ctz(ARM_HWCAP2_A64_FLAGM2       )] = "flagm2",
    [__builtin_ctz(ARM_HWCAP2_A64_FRINT        )] = "frint",
    [__builtin_ctz(ARM_HWCAP2_A64_SVEI8MM      )] = "svei8mm",
    [__builtin_ctz(ARM_HWCAP2_A64_SVEF32MM     )] = "svef32mm",
    [__builtin_ctz(ARM_HWCAP2_A64_SVEF64MM     )] = "svef64mm",
    [__builtin_ctz(ARM_HWCAP2_A64_SVEBF16      )] = "svebf16",
    [__builtin_ctz(ARM_HWCAP2_A64_I8MM         )] = "i8mm",
    [__builtin_ctz(ARM_HWCAP2_A64_BF16         )] = "bf16",
    [__builtin_ctz(ARM_HWCAP2_A64_DGH          )] = "dgh",
    [__builtin_ctz(ARM_HWCAP2_A64_RNG          )] = "rng",
    [__builtin_ctz(ARM_HWCAP2_A64_BTI          )] = "bti",
    [__builtin_ctz(ARM_HWCAP2_A64_MTE          )] = "mte",
    [__builtin_ctz(ARM_HWCAP2_A64_ECV          )] = "ecv",
    [__builtin_ctz(ARM_HWCAP2_A64_AFP          )] = "afp",
    [__builtin_ctz(ARM_HWCAP2_A64_RPRES        )] = "rpres",
    [__builtin_ctz(ARM_HWCAP2_A64_MTE3         )] = "mte3",
    [__builtin_ctz(ARM_HWCAP2_A64_SME          )] = "sme",
    [__builtin_ctz(ARM_HWCAP2_A64_SME_I16I64   )] = "smei16i64",
    [__builtin_ctz(ARM_HWCAP2_A64_SME_F64F64   )] = "smef64f64",
    [__builtin_ctz(ARM_HWCAP2_A64_SME_I8I32    )] = "smei8i32",
    [__builtin_ctz(ARM_HWCAP2_A64_SME_F16F32   )] = "smef16f32",
    [__builtin_ctz(ARM_HWCAP2_A64_SME_B16F32   )] = "smeb16f32",
    [__builtin_ctz(ARM_HWCAP2_A64_SME_F32F32   )] = "smef32f32",
    [__builtin_ctz(ARM_HWCAP2_A64_SME_FA64     )] = "smefa64",
    [__builtin_ctz(ARM_HWCAP2_A64_WFXT         )] = "wfxt",
    [__builtin_ctzll(ARM_HWCAP2_A64_EBF16      )] = "ebf16",
    [__builtin_ctzll(ARM_HWCAP2_A64_SVE_EBF16  )] = "sveebf16",
    [__builtin_ctzll(ARM_HWCAP2_A64_CSSC       )] = "cssc",
    [__builtin_ctzll(ARM_HWCAP2_A64_RPRFM      )] = "rprfm",
    [__builtin_ctzll(ARM_HWCAP2_A64_SVE2P1     )] = "sve2p1",
    [__builtin_ctzll(ARM_HWCAP2_A64_SME2       )] = "sme2",
    [__builtin_ctzll(ARM_HWCAP2_A64_SME2P1     )] = "sme2p1",
    [__builtin_ctzll(ARM_HWCAP2_A64_SME_I16I32 )] = "smei16i32",
    [__builtin_ctzll(ARM_HWCAP2_A64_SME_BI32I32)] = "smebi32i32",
    [__builtin_ctzll(ARM_HWCAP2_A64_SME_B16B16 )] = "smeb16b16",
    [__builtin_ctzll(ARM_HWCAP2_A64_SME_F16F16 )] = "smef16f16",
    [__builtin_ctzll(ARM_HWCAP2_A64_MOPS       )] = "mops",
    [__builtin_ctzll(ARM_HWCAP2_A64_HBC        )] = "hbc",
    };

    return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
}

#undef GET_FEATURE_ID

#endif /* not TARGET_AARCH64 */

#if TARGET_BIG_ENDIAN
# define VDSO_HEADER  "vdso-be.c.inc"
#else
# define VDSO_HEADER  "vdso-le.c.inc"
#endif

#endif /* TARGET_ARM */

#ifdef TARGET_SPARC
#ifdef TARGET_SPARC64

#define ELF_HWCAP  (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \
                    | HWCAP_SPARC_MULDIV | HWCAP_SPARC_V9)
#ifndef TARGET_ABI32
#define elf_check_arch(x) ( (x) == EM_SPARCV9 || (x) == EM_SPARC32PLUS )
#else
#define elf_check_arch(x) ( (x) == EM_SPARC32PLUS || (x) == EM_SPARC )
#endif

#define ELF_CLASS   ELFCLASS64
#define ELF_ARCH    EM_SPARCV9
#else
#define ELF_HWCAP  (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \
                    | HWCAP_SPARC_MULDIV)
#define ELF_CLASS   ELFCLASS32
#define ELF_ARCH    EM_SPARC
#endif /* TARGET_SPARC64 */

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    /* Note that target_cpu_copy_regs does not read psr/tstate. */
    regs->pc = infop->entry;
    regs->npc = regs->pc + 4;
    regs->y = 0;
    regs->u_regs[14] = (infop->start_stack - 16 * sizeof(abi_ulong)
                        - TARGET_STACK_BIAS);
}
#endif /* TARGET_SPARC */

#ifdef TARGET_PPC

#define ELF_MACHINE    PPC_ELF_MACHINE

#if defined(TARGET_PPC64)

#define elf_check_arch(x) ( (x) == EM_PPC64 )

#define ELF_CLASS       ELFCLASS64

#else

#define ELF_CLASS       ELFCLASS32
#define EXSTACK_DEFAULT true

#endif

#define ELF_ARCH        EM_PPC

/* Feature masks for the Aux Vector Hardware Capabilities (AT_HWCAP).
   See arch/powerpc/include/asm/cputable.h.  */
enum {
    QEMU_PPC_FEATURE_32 = 0x80000000,
    QEMU_PPC_FEATURE_64 = 0x40000000,
    QEMU_PPC_FEATURE_601_INSTR = 0x20000000,
    QEMU_PPC_FEATURE_HAS_ALTIVEC = 0x10000000,
    QEMU_PPC_FEATURE_HAS_FPU = 0x08000000,
    QEMU_PPC_FEATURE_HAS_MMU = 0x04000000,
    QEMU_PPC_FEATURE_HAS_4xxMAC = 0x02000000,
    QEMU_PPC_FEATURE_UNIFIED_CACHE = 0x01000000,
    QEMU_PPC_FEATURE_HAS_SPE = 0x00800000,
    QEMU_PPC_FEATURE_HAS_EFP_SINGLE = 0x00400000,
    QEMU_PPC_FEATURE_HAS_EFP_DOUBLE = 0x00200000,
    QEMU_PPC_FEATURE_NO_TB = 0x00100000,
    QEMU_PPC_FEATURE_POWER4 = 0x00080000,
    QEMU_PPC_FEATURE_POWER5 = 0x00040000,
    QEMU_PPC_FEATURE_POWER5_PLUS = 0x00020000,
    QEMU_PPC_FEATURE_CELL = 0x00010000,
    QEMU_PPC_FEATURE_BOOKE = 0x00008000,
    QEMU_PPC_FEATURE_SMT = 0x00004000,
    QEMU_PPC_FEATURE_ICACHE_SNOOP = 0x00002000,
    QEMU_PPC_FEATURE_ARCH_2_05 = 0x00001000,
    QEMU_PPC_FEATURE_PA6T = 0x00000800,
    QEMU_PPC_FEATURE_HAS_DFP = 0x00000400,
    QEMU_PPC_FEATURE_POWER6_EXT = 0x00000200,
    QEMU_PPC_FEATURE_ARCH_2_06 = 0x00000100,
    QEMU_PPC_FEATURE_HAS_VSX = 0x00000080,
    QEMU_PPC_FEATURE_PSERIES_PERFMON_COMPAT = 0x00000040,

    QEMU_PPC_FEATURE_TRUE_LE = 0x00000002,
    QEMU_PPC_FEATURE_PPC_LE = 0x00000001,

    /* Feature definitions in AT_HWCAP2.  */
    QEMU_PPC_FEATURE2_ARCH_2_07 = 0x80000000, /* ISA 2.07 */
    QEMU_PPC_FEATURE2_HAS_HTM = 0x40000000, /* Hardware Transactional Memory */
    QEMU_PPC_FEATURE2_HAS_DSCR = 0x20000000, /* Data Stream Control Register */
    QEMU_PPC_FEATURE2_HAS_EBB = 0x10000000, /* Event Base Branching */
    QEMU_PPC_FEATURE2_HAS_ISEL = 0x08000000, /* Integer Select */
    QEMU_PPC_FEATURE2_HAS_TAR = 0x04000000, /* Target Address Register */
    QEMU_PPC_FEATURE2_VEC_CRYPTO = 0x02000000,
    QEMU_PPC_FEATURE2_HTM_NOSC = 0x01000000,
    QEMU_PPC_FEATURE2_ARCH_3_00 = 0x00800000, /* ISA 3.00 */
    QEMU_PPC_FEATURE2_HAS_IEEE128 = 0x00400000, /* VSX IEEE Bin Float 128-bit */
    QEMU_PPC_FEATURE2_DARN = 0x00200000, /* darn random number insn */
    QEMU_PPC_FEATURE2_SCV = 0x00100000, /* scv syscall */
    QEMU_PPC_FEATURE2_HTM_NO_SUSPEND = 0x00080000, /* TM w/o suspended state */
    QEMU_PPC_FEATURE2_ARCH_3_1 = 0x00040000, /* ISA 3.1 */
    QEMU_PPC_FEATURE2_MMA = 0x00020000, /* Matrix-Multiply Assist */
};

#define ELF_HWCAP get_elf_hwcap()

static uint32_t get_elf_hwcap(void)
{
    PowerPCCPU *cpu = POWERPC_CPU(thread_cpu);
    uint32_t features = 0;

    /* We don't have to be terribly complete here; the high points are
       Altivec/FP/SPE support.  Anything else is just a bonus.  */
#define GET_FEATURE(flag, feature)                                      \
    do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0)
#define GET_FEATURE2(flags, feature) \
    do { \
        if ((cpu->env.insns_flags2 & flags) == flags) { \
            features |= feature; \
        } \
    } while (0)
    GET_FEATURE(PPC_64B, QEMU_PPC_FEATURE_64);
    GET_FEATURE(PPC_FLOAT, QEMU_PPC_FEATURE_HAS_FPU);
    GET_FEATURE(PPC_ALTIVEC, QEMU_PPC_FEATURE_HAS_ALTIVEC);
    GET_FEATURE(PPC_SPE, QEMU_PPC_FEATURE_HAS_SPE);
    GET_FEATURE(PPC_SPE_SINGLE, QEMU_PPC_FEATURE_HAS_EFP_SINGLE);
    GET_FEATURE(PPC_SPE_DOUBLE, QEMU_PPC_FEATURE_HAS_EFP_DOUBLE);
    GET_FEATURE(PPC_BOOKE, QEMU_PPC_FEATURE_BOOKE);
    GET_FEATURE(PPC_405_MAC, QEMU_PPC_FEATURE_HAS_4xxMAC);
    GET_FEATURE2(PPC2_DFP, QEMU_PPC_FEATURE_HAS_DFP);
    GET_FEATURE2(PPC2_VSX, QEMU_PPC_FEATURE_HAS_VSX);
    GET_FEATURE2((PPC2_PERM_ISA206 | PPC2_DIVE_ISA206 | PPC2_ATOMIC_ISA206 |
                  PPC2_FP_CVT_ISA206 | PPC2_FP_TST_ISA206),
                  QEMU_PPC_FEATURE_ARCH_2_06);
#undef GET_FEATURE
#undef GET_FEATURE2

    return features;
}

#define ELF_HWCAP2 get_elf_hwcap2()

static uint32_t get_elf_hwcap2(void)
{
    PowerPCCPU *cpu = POWERPC_CPU(thread_cpu);
    uint32_t features = 0;

#define GET_FEATURE(flag, feature)                                      \
    do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0)
#define GET_FEATURE2(flag, feature)                                      \
    do { if (cpu->env.insns_flags2 & flag) { features |= feature; } } while (0)

    GET_FEATURE(PPC_ISEL, QEMU_PPC_FEATURE2_HAS_ISEL);
    GET_FEATURE2(PPC2_BCTAR_ISA207, QEMU_PPC_FEATURE2_HAS_TAR);
    GET_FEATURE2((PPC2_BCTAR_ISA207 | PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 |
                  PPC2_ISA207S), QEMU_PPC_FEATURE2_ARCH_2_07 |
                  QEMU_PPC_FEATURE2_VEC_CRYPTO);
    GET_FEATURE2(PPC2_ISA300, QEMU_PPC_FEATURE2_ARCH_3_00 |
                 QEMU_PPC_FEATURE2_DARN | QEMU_PPC_FEATURE2_HAS_IEEE128);
    GET_FEATURE2(PPC2_ISA310, QEMU_PPC_FEATURE2_ARCH_3_1 |
                 QEMU_PPC_FEATURE2_MMA);

#undef GET_FEATURE
#undef GET_FEATURE2

    return features;
}

/*
 * The requirements here are:
 * - keep the final alignment of sp (sp & 0xf)
 * - make sure the 32-bit value at the first 16 byte aligned position of
 *   AUXV is greater than 16 for glibc compatibility.
 *   AT_IGNOREPPC is used for that.
 * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
 *   even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
 */
#define DLINFO_ARCH_ITEMS       5
#define ARCH_DLINFO                                     \
    do {                                                \
        PowerPCCPU *cpu = POWERPC_CPU(thread_cpu);              \
        /*                                              \
         * Handle glibc compatibility: these magic entries must \
         * be at the lowest addresses in the final auxv.        \
         */                                             \
        NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC);        \
        NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC);        \
        NEW_AUX_ENT(AT_DCACHEBSIZE, cpu->env.dcache_line_size); \
        NEW_AUX_ENT(AT_ICACHEBSIZE, cpu->env.icache_line_size); \
        NEW_AUX_ENT(AT_UCACHEBSIZE, 0);                 \
    } while (0)

static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop)
{
    _regs->gpr[1] = infop->start_stack;
#if defined(TARGET_PPC64)
    if (get_ppc64_abi(infop) < 2) {
        uint64_t val;
        get_user_u64(val, infop->entry + 8);
        _regs->gpr[2] = val + infop->load_bias;
        get_user_u64(val, infop->entry);
        infop->entry = val + infop->load_bias;
    } else {
        _regs->gpr[12] = infop->entry;  /* r12 set to global entry address */
    }
#endif
    _regs->nip = infop->entry;
}

/* See linux kernel: arch/powerpc/include/asm/elf.h.  */
#define ELF_NREG 48
typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];

static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUPPCState *env)
{
    int i;
    target_ulong ccr = 0;

    for (i = 0; i < ARRAY_SIZE(env->gpr); i++) {
        (*regs)[i] = tswapreg(env->gpr[i]);
    }

    (*regs)[32] = tswapreg(env->nip);
    (*regs)[33] = tswapreg(env->msr);
    (*regs)[35] = tswapreg(env->ctr);
    (*regs)[36] = tswapreg(env->lr);
    (*regs)[37] = tswapreg(cpu_read_xer(env));

    ccr = ppc_get_cr(env);
    (*regs)[38] = tswapreg(ccr);
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE       4096

#endif

#ifdef TARGET_LOONGARCH64

#define ELF_CLASS   ELFCLASS64
#define ELF_ARCH    EM_LOONGARCH
#define EXSTACK_DEFAULT true

#define elf_check_arch(x) ((x) == EM_LOONGARCH)

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    /*Set crmd PG,DA = 1,0 */
    regs->csr.crmd = 2 << 3;
    regs->csr.era = infop->entry;
    regs->regs[3] = infop->start_stack;
}

/* See linux kernel: arch/loongarch/include/asm/elf.h */
#define ELF_NREG 45
typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];

enum {
    TARGET_EF_R0 = 0,
    TARGET_EF_CSR_ERA = TARGET_EF_R0 + 33,
    TARGET_EF_CSR_BADV = TARGET_EF_R0 + 34,
};

static void elf_core_copy_regs(target_elf_gregset_t *regs,
                               const CPULoongArchState *env)
{
    int i;

    (*regs)[TARGET_EF_R0] = 0;

    for (i = 1; i < ARRAY_SIZE(env->gpr); i++) {
        (*regs)[TARGET_EF_R0 + i] = tswapreg(env->gpr[i]);
    }

    (*regs)[TARGET_EF_CSR_ERA] = tswapreg(env->pc);
    (*regs)[TARGET_EF_CSR_BADV] = tswapreg(env->CSR_BADV);
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE        4096

#define ELF_HWCAP get_elf_hwcap()

/* See arch/loongarch/include/uapi/asm/hwcap.h */
enum {
    HWCAP_LOONGARCH_CPUCFG   = (1 << 0),
    HWCAP_LOONGARCH_LAM      = (1 << 1),
    HWCAP_LOONGARCH_UAL      = (1 << 2),
    HWCAP_LOONGARCH_FPU      = (1 << 3),
    HWCAP_LOONGARCH_LSX      = (1 << 4),
    HWCAP_LOONGARCH_LASX     = (1 << 5),
    HWCAP_LOONGARCH_CRC32    = (1 << 6),
    HWCAP_LOONGARCH_COMPLEX  = (1 << 7),
    HWCAP_LOONGARCH_CRYPTO   = (1 << 8),
    HWCAP_LOONGARCH_LVZ      = (1 << 9),
    HWCAP_LOONGARCH_LBT_X86  = (1 << 10),
    HWCAP_LOONGARCH_LBT_ARM  = (1 << 11),
    HWCAP_LOONGARCH_LBT_MIPS = (1 << 12),
};

static uint32_t get_elf_hwcap(void)
{
    LoongArchCPU *cpu = LOONGARCH_CPU(thread_cpu);
    uint32_t hwcaps = 0;

    hwcaps |= HWCAP_LOONGARCH_CRC32;

    if (FIELD_EX32(cpu->env.cpucfg[1], CPUCFG1, UAL)) {
        hwcaps |= HWCAP_LOONGARCH_UAL;
    }

    if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, FP)) {
        hwcaps |= HWCAP_LOONGARCH_FPU;
    }

    if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LAM)) {
        hwcaps |= HWCAP_LOONGARCH_LAM;
    }

    if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LSX)) {
        hwcaps |= HWCAP_LOONGARCH_LSX;
    }

    if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LASX)) {
        hwcaps |= HWCAP_LOONGARCH_LASX;
    }

    return hwcaps;
}

#define ELF_PLATFORM "loongarch"

#endif /* TARGET_LOONGARCH64 */

#ifdef TARGET_MIPS

#ifdef TARGET_MIPS64
#define ELF_CLASS   ELFCLASS64
#else
#define ELF_CLASS   ELFCLASS32
#endif
#define ELF_ARCH    EM_MIPS
#define EXSTACK_DEFAULT true

#ifdef TARGET_ABI_MIPSN32
#define elf_check_abi(x) ((x) & EF_MIPS_ABI2)
#else
#define elf_check_abi(x) (!((x) & EF_MIPS_ABI2))
#endif

#define ELF_BASE_PLATFORM get_elf_base_platform()

#define MATCH_PLATFORM_INSN(_flags, _base_platform)      \
    do { if ((cpu->env.insn_flags & (_flags)) == _flags) \
    { return _base_platform; } } while (0)

static const char *get_elf_base_platform(void)
{
    MIPSCPU *cpu = MIPS_CPU(thread_cpu);

    /* 64 bit ISAs goes first */
    MATCH_PLATFORM_INSN(CPU_MIPS64R6, "mips64r6");
    MATCH_PLATFORM_INSN(CPU_MIPS64R5, "mips64r5");
    MATCH_PLATFORM_INSN(CPU_MIPS64R2, "mips64r2");
    MATCH_PLATFORM_INSN(CPU_MIPS64R1, "mips64");
    MATCH_PLATFORM_INSN(CPU_MIPS5, "mips5");
    MATCH_PLATFORM_INSN(CPU_MIPS4, "mips4");
    MATCH_PLATFORM_INSN(CPU_MIPS3, "mips3");

    /* 32 bit ISAs */
    MATCH_PLATFORM_INSN(CPU_MIPS32R6, "mips32r6");
    MATCH_PLATFORM_INSN(CPU_MIPS32R5, "mips32r5");
    MATCH_PLATFORM_INSN(CPU_MIPS32R2, "mips32r2");
    MATCH_PLATFORM_INSN(CPU_MIPS32R1, "mips32");
    MATCH_PLATFORM_INSN(CPU_MIPS2, "mips2");

    /* Fallback */
    return "mips";
}
#undef MATCH_PLATFORM_INSN

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    regs->cp0_status = 2 << CP0St_KSU;
    regs->cp0_epc = infop->entry;
    regs->regs[29] = infop->start_stack;
}

/* See linux kernel: arch/mips/include/asm/elf.h.  */
#define ELF_NREG 45
typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];

/* See linux kernel: arch/mips/include/asm/reg.h.  */
enum {
#ifdef TARGET_MIPS64
    TARGET_EF_R0 = 0,
#else
    TARGET_EF_R0 = 6,
#endif
    TARGET_EF_R26 = TARGET_EF_R0 + 26,
    TARGET_EF_R27 = TARGET_EF_R0 + 27,
    TARGET_EF_LO = TARGET_EF_R0 + 32,
    TARGET_EF_HI = TARGET_EF_R0 + 33,
    TARGET_EF_CP0_EPC = TARGET_EF_R0 + 34,
    TARGET_EF_CP0_BADVADDR = TARGET_EF_R0 + 35,
    TARGET_EF_CP0_STATUS = TARGET_EF_R0 + 36,
    TARGET_EF_CP0_CAUSE = TARGET_EF_R0 + 37
};

/* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs.  */
static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMIPSState *env)
{
    int i;

    for (i = 0; i < TARGET_EF_R0; i++) {
        (*regs)[i] = 0;
    }
    (*regs)[TARGET_EF_R0] = 0;

    for (i = 1; i < ARRAY_SIZE(env->active_tc.gpr); i++) {
        (*regs)[TARGET_EF_R0 + i] = tswapreg(env->active_tc.gpr[i]);
    }

    (*regs)[TARGET_EF_R26] = 0;
    (*regs)[TARGET_EF_R27] = 0;
    (*regs)[TARGET_EF_LO] = tswapreg(env->active_tc.LO[0]);
    (*regs)[TARGET_EF_HI] = tswapreg(env->active_tc.HI[0]);
    (*regs)[TARGET_EF_CP0_EPC] = tswapreg(env->active_tc.PC);
    (*regs)[TARGET_EF_CP0_BADVADDR] = tswapreg(env->CP0_BadVAddr);
    (*regs)[TARGET_EF_CP0_STATUS] = tswapreg(env->CP0_Status);
    (*regs)[TARGET_EF_CP0_CAUSE] = tswapreg(env->CP0_Cause);
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE        4096

/* See arch/mips/include/uapi/asm/hwcap.h.  */
enum {
    HWCAP_MIPS_R6           = (1 << 0),
    HWCAP_MIPS_MSA          = (1 << 1),
    HWCAP_MIPS_CRC32        = (1 << 2),
    HWCAP_MIPS_MIPS16       = (1 << 3),
    HWCAP_MIPS_MDMX         = (1 << 4),
    HWCAP_MIPS_MIPS3D       = (1 << 5),
    HWCAP_MIPS_SMARTMIPS    = (1 << 6),
    HWCAP_MIPS_DSP          = (1 << 7),
    HWCAP_MIPS_DSP2         = (1 << 8),
    HWCAP_MIPS_DSP3         = (1 << 9),
    HWCAP_MIPS_MIPS16E2     = (1 << 10),
    HWCAP_LOONGSON_MMI      = (1 << 11),
    HWCAP_LOONGSON_EXT      = (1 << 12),
    HWCAP_LOONGSON_EXT2     = (1 << 13),
    HWCAP_LOONGSON_CPUCFG   = (1 << 14),
};

#define ELF_HWCAP get_elf_hwcap()

#define GET_FEATURE_INSN(_flag, _hwcap) \
    do { if (cpu->env.insn_flags & (_flag)) { hwcaps |= _hwcap; } } while (0)

#define GET_FEATURE_REG_SET(_reg, _mask, _hwcap) \
    do { if (cpu->env._reg & (_mask)) { hwcaps |= _hwcap; } } while (0)

#define GET_FEATURE_REG_EQU(_reg, _start, _length, _val, _hwcap) \
    do { \
        if (extract32(cpu->env._reg, (_start), (_length)) == (_val)) { \
            hwcaps |= _hwcap; \
        } \
    } while (0)

static uint32_t get_elf_hwcap(void)
{
    MIPSCPU *cpu = MIPS_CPU(thread_cpu);
    uint32_t hwcaps = 0;

    GET_FEATURE_REG_EQU(CP0_Config0, CP0C0_AR, CP0C0_AR_LENGTH,
                        2, HWCAP_MIPS_R6);
    GET_FEATURE_REG_SET(CP0_Config3, 1 << CP0C3_MSAP, HWCAP_MIPS_MSA);
    GET_FEATURE_INSN(ASE_LMMI, HWCAP_LOONGSON_MMI);
    GET_FEATURE_INSN(ASE_LEXT, HWCAP_LOONGSON_EXT);

    return hwcaps;
}

#undef GET_FEATURE_REG_EQU
#undef GET_FEATURE_REG_SET
#undef GET_FEATURE_INSN

#endif /* TARGET_MIPS */

#ifdef TARGET_MICROBLAZE

#define elf_check_arch(x) ( (x) == EM_MICROBLAZE || (x) == EM_MICROBLAZE_OLD)

#define ELF_CLASS   ELFCLASS32
#define ELF_ARCH    EM_MICROBLAZE

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    regs->pc = infop->entry;
    regs->r1 = infop->start_stack;

}

#define ELF_EXEC_PAGESIZE        4096

#define USE_ELF_CORE_DUMP
#define ELF_NREG 38
typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];

/* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs.  */
static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMBState *env)
{
    int i, pos = 0;

    for (i = 0; i < 32; i++) {
        (*regs)[pos++] = tswapreg(env->regs[i]);
    }

    (*regs)[pos++] = tswapreg(env->pc);
    (*regs)[pos++] = tswapreg(mb_cpu_read_msr(env));
    (*regs)[pos++] = 0;
    (*regs)[pos++] = tswapreg(env->ear);
    (*regs)[pos++] = 0;
    (*regs)[pos++] = tswapreg(env->esr);
}

#endif /* TARGET_MICROBLAZE */

#ifdef TARGET_NIOS2

#define elf_check_arch(x) ((x) == EM_ALTERA_NIOS2)

#define ELF_CLASS   ELFCLASS32
#define ELF_ARCH    EM_ALTERA_NIOS2

static void init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
    regs->ea = infop->entry;
    regs->sp = infop->start_stack;
}

#define LO_COMMPAGE  TARGET_PAGE_SIZE

static bool init_guest_commpage(void)
{
    static const uint8_t kuser_page[4 + 2 * 64] = {
        /* __kuser_helper_version */
        [0x00] = 0x02, 0x00, 0x00, 0x00,

        /* __kuser_cmpxchg */
        [0x04] = 0x3a, 0x6c, 0x3b, 0x00,  /* trap 16 */
                 0x3a, 0x28, 0x00, 0xf8,  /* ret */

        /* __kuser_sigtramp */
        [0x44] = 0xc4, 0x22, 0x80, 0x00,  /* movi r2, __NR_rt_sigreturn */
                 0x3a, 0x68, 0x3b, 0x00,  /* trap 0 */
    };

    void *want = g2h_untagged(LO_COMMPAGE & -qemu_host_page_size);
    void *addr = mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE,
                      MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);

    if (addr == MAP_FAILED) {
        perror("Allocating guest commpage");
        exit(EXIT_FAILURE);
    }
    if (addr != want) {
        return false;
    }

    memcpy(addr, kuser_page, sizeof(kuser_page));

    if (mprotect(addr, qemu_host_page_size, PROT_READ)) {
        perror("Protecting guest commpage");
        exit(EXIT_FAILURE);
    }

    page_set_flags(LO_COMMPAGE, LO_COMMPAGE | ~TARGET_PAGE_MASK,
                   PAGE_READ | PAGE_EXEC | PAGE_VALID);
    return true;
}

#define ELF_EXEC_PAGESIZE        4096

#define USE_ELF_CORE_DUMP
#define ELF_NREG 49
typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];

/* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs.  */
static void elf_core_copy_regs(target_elf_gregset_t *regs,
                               const CPUNios2State *env)
{
    int i;

    (*regs)[0] = -1;
    for (i = 1; i < 8; i++)    /* r0-r7 */
        (*regs)[i] = tswapreg(env->regs[i + 7]);

    for (i = 8; i < 16; i++)   /* r8-r15 */
        (*regs)[i] = tswapreg(env->regs[i - 8]);

    for (i = 16; i < 24; i++)  /* r16-r23 */
        (*regs)[i] = tswapreg(env->regs[i + 7]);
    (*regs)[24] = -1;    /* R_ET */
    (*regs)[25] = -1;    /* R_BT */
    (*regs)[26] = tswapreg(env->regs[R_GP]);
    (*regs)[27] = tswapreg(env->regs[R_SP]);
    (*regs)[28] = tswapreg(env->regs[R_FP]);
    (*regs)[29] = tswapreg(env->regs[R_EA]);
    (*regs)[30] = -1;    /* R_SSTATUS */
    (*regs)[31] = tswapreg(env->regs[R_RA]);

    (*regs)[32] = tswapreg(env->pc);

    (*regs)[33] = -1; /* R_STATUS */
    (*regs)[34] = tswapreg(env->regs[CR_ESTATUS]);

    for (i = 35; i < 49; i++)    /* ... */
        (*regs)[i] = -1;
}

#endif /* TARGET_NIOS2 */

#ifdef TARGET_OPENRISC

#define ELF_ARCH EM_OPENRISC
#define ELF_CLASS ELFCLASS32
#define ELF_DATA  ELFDATA2MSB

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    regs->pc = infop->entry;
    regs->gpr[1] = infop->start_stack;
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE 8192

/* See linux kernel arch/openrisc/include/asm/elf.h.  */
#define ELF_NREG 34 /* gprs and pc, sr */
typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];

static void elf_core_copy_regs(target_elf_gregset_t *regs,
                               const CPUOpenRISCState *env)
{
    int i;

    for (i = 0; i < 32; i++) {
        (*regs)[i] = tswapreg(cpu_get_gpr(env, i));
    }
    (*regs)[32] = tswapreg(env->pc);
    (*regs)[33] = tswapreg(cpu_get_sr(env));
}
#define ELF_HWCAP 0
#define ELF_PLATFORM NULL

#endif /* TARGET_OPENRISC */

#ifdef TARGET_SH4

#define ELF_CLASS ELFCLASS32
#define ELF_ARCH  EM_SH

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    /* Check other registers XXXXX */
    regs->pc = infop->entry;
    regs->regs[15] = infop->start_stack;
}

/* See linux kernel: arch/sh/include/asm/elf.h.  */
#define ELF_NREG 23
typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];

/* See linux kernel: arch/sh/include/asm/ptrace.h.  */
enum {
    TARGET_REG_PC = 16,
    TARGET_REG_PR = 17,
    TARGET_REG_SR = 18,
    TARGET_REG_GBR = 19,
    TARGET_REG_MACH = 20,
    TARGET_REG_MACL = 21,
    TARGET_REG_SYSCALL = 22
};

static inline void elf_core_copy_regs(target_elf_gregset_t *regs,
                                      const CPUSH4State *env)
{
    int i;

    for (i = 0; i < 16; i++) {
        (*regs)[i] = tswapreg(env->gregs[i]);
    }

    (*regs)[TARGET_REG_PC] = tswapreg(env->pc);
    (*regs)[TARGET_REG_PR] = tswapreg(env->pr);
    (*regs)[TARGET_REG_SR] = tswapreg(env->sr);
    (*regs)[TARGET_REG_GBR] = tswapreg(env->gbr);
    (*regs)[TARGET_REG_MACH] = tswapreg(env->mach);
    (*regs)[TARGET_REG_MACL] = tswapreg(env->macl);
    (*regs)[TARGET_REG_SYSCALL] = 0; /* FIXME */
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE        4096

enum {
    SH_CPU_HAS_FPU            = 0x0001, /* Hardware FPU support */
    SH_CPU_HAS_P2_FLUSH_BUG   = 0x0002, /* Need to flush the cache in P2 area */
    SH_CPU_HAS_MMU_PAGE_ASSOC = 0x0004, /* SH3: TLB way selection bit support */
    SH_CPU_HAS_DSP            = 0x0008, /* SH-DSP: DSP support */
    SH_CPU_HAS_PERF_COUNTER   = 0x0010, /* Hardware performance counters */
    SH_CPU_HAS_PTEA           = 0x0020, /* PTEA register */
    SH_CPU_HAS_LLSC           = 0x0040, /* movli.l/movco.l */
    SH_CPU_HAS_L2_CACHE       = 0x0080, /* Secondary cache / URAM */
    SH_CPU_HAS_OP32           = 0x0100, /* 32-bit instruction support */
    SH_CPU_HAS_PTEAEX         = 0x0200, /* PTE ASID Extension support */
};

#define ELF_HWCAP get_elf_hwcap()

static uint32_t get_elf_hwcap(void)
{
    SuperHCPU *cpu = SUPERH_CPU(thread_cpu);
    uint32_t hwcap = 0;

    hwcap |= SH_CPU_HAS_FPU;

    if (cpu->env.features & SH_FEATURE_SH4A) {
        hwcap |= SH_CPU_HAS_LLSC;
    }

    return hwcap;
}

#endif

#ifdef TARGET_CRIS

#define ELF_CLASS ELFCLASS32
#define ELF_ARCH  EM_CRIS

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    regs->erp = infop->entry;
}

#define ELF_EXEC_PAGESIZE        8192

#endif

#ifdef TARGET_M68K

#define ELF_CLASS       ELFCLASS32
#define ELF_ARCH        EM_68K

/* ??? Does this need to do anything?
   #define ELF_PLAT_INIT(_r) */

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    regs->usp = infop->start_stack;
    regs->sr = 0;
    regs->pc = infop->entry;
}

/* See linux kernel: arch/m68k/include/asm/elf.h.  */
#define ELF_NREG 20
typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];

static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUM68KState *env)
{
    (*regs)[0] = tswapreg(env->dregs[1]);
    (*regs)[1] = tswapreg(env->dregs[2]);
    (*regs)[2] = tswapreg(env->dregs[3]);
    (*regs)[3] = tswapreg(env->dregs[4]);
    (*regs)[4] = tswapreg(env->dregs[5]);
    (*regs)[5] = tswapreg(env->dregs[6]);
    (*regs)[6] = tswapreg(env->dregs[7]);
    (*regs)[7] = tswapreg(env->aregs[0]);
    (*regs)[8] = tswapreg(env->aregs[1]);
    (*regs)[9] = tswapreg(env->aregs[2]);
    (*regs)[10] = tswapreg(env->aregs[3]);
    (*regs)[11] = tswapreg(env->aregs[4]);
    (*regs)[12] = tswapreg(env->aregs[5]);
    (*regs)[13] = tswapreg(env->aregs[6]);
    (*regs)[14] = tswapreg(env->dregs[0]);
    (*regs)[15] = tswapreg(env->aregs[7]);
    (*regs)[16] = tswapreg(env->dregs[0]); /* FIXME: orig_d0 */
    (*regs)[17] = tswapreg(env->sr);
    (*regs)[18] = tswapreg(env->pc);
    (*regs)[19] = 0;  /* FIXME: regs->format | regs->vector */
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE       8192

#endif

#ifdef TARGET_ALPHA

#define ELF_CLASS      ELFCLASS64
#define ELF_ARCH       EM_ALPHA

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    regs->pc = infop->entry;
    regs->ps = 8;
    regs->usp = infop->start_stack;
}

#define ELF_EXEC_PAGESIZE        8192

#endif /* TARGET_ALPHA */

#ifdef TARGET_S390X

#define ELF_CLASS	ELFCLASS64
#define ELF_DATA	ELFDATA2MSB
#define ELF_ARCH	EM_S390

#include "elf.h"

#define ELF_HWCAP get_elf_hwcap()

#define GET_FEATURE(_feat, _hwcap) \
    do { if (s390_has_feat(_feat)) { hwcap |= _hwcap; } } while (0)

uint32_t get_elf_hwcap(void)
{
    /*
     * Let's assume we always have esan3 and zarch.
     * 31-bit processes can use 64-bit registers (high gprs).
     */
    uint32_t hwcap = HWCAP_S390_ESAN3 | HWCAP_S390_ZARCH | HWCAP_S390_HIGH_GPRS;

    GET_FEATURE(S390_FEAT_STFLE, HWCAP_S390_STFLE);
    GET_FEATURE(S390_FEAT_MSA, HWCAP_S390_MSA);
    GET_FEATURE(S390_FEAT_LONG_DISPLACEMENT, HWCAP_S390_LDISP);
    GET_FEATURE(S390_FEAT_EXTENDED_IMMEDIATE, HWCAP_S390_EIMM);
    if (s390_has_feat(S390_FEAT_EXTENDED_TRANSLATION_3) &&
        s390_has_feat(S390_FEAT_ETF3_ENH)) {
        hwcap |= HWCAP_S390_ETF3EH;
    }
    GET_FEATURE(S390_FEAT_VECTOR, HWCAP_S390_VXRS);
    GET_FEATURE(S390_FEAT_VECTOR_ENH, HWCAP_S390_VXRS_EXT);
    GET_FEATURE(S390_FEAT_VECTOR_ENH2, HWCAP_S390_VXRS_EXT2);

    return hwcap;
}

const char *elf_hwcap_str(uint32_t bit)
{
    static const char *hwcap_str[] = {
        [HWCAP_S390_NR_ESAN3]     = "esan3",
        [HWCAP_S390_NR_ZARCH]     = "zarch",
        [HWCAP_S390_NR_STFLE]     = "stfle",
        [HWCAP_S390_NR_MSA]       = "msa",
        [HWCAP_S390_NR_LDISP]     = "ldisp",
        [HWCAP_S390_NR_EIMM]      = "eimm",
        [HWCAP_S390_NR_DFP]       = "dfp",
        [HWCAP_S390_NR_HPAGE]     = "edat",
        [HWCAP_S390_NR_ETF3EH]    = "etf3eh",
        [HWCAP_S390_NR_HIGH_GPRS] = "highgprs",
        [HWCAP_S390_NR_TE]        = "te",
        [HWCAP_S390_NR_VXRS]      = "vx",
        [HWCAP_S390_NR_VXRS_BCD]  = "vxd",
        [HWCAP_S390_NR_VXRS_EXT]  = "vxe",
        [HWCAP_S390_NR_GS]        = "gs",
        [HWCAP_S390_NR_VXRS_EXT2] = "vxe2",
        [HWCAP_S390_NR_VXRS_PDE]  = "vxp",
        [HWCAP_S390_NR_SORT]      = "sort",
        [HWCAP_S390_NR_DFLT]      = "dflt",
        [HWCAP_S390_NR_NNPA]      = "nnpa",
        [HWCAP_S390_NR_PCI_MIO]   = "pcimio",
        [HWCAP_S390_NR_SIE]       = "sie",
    };

    return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
}

static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
    regs->psw.addr = infop->entry;
    regs->psw.mask = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | \
                     PSW_MASK_MCHECK | PSW_MASK_PSTATE | PSW_MASK_64 | \
                     PSW_MASK_32;
    regs->gprs[15] = infop->start_stack;
}

/* See linux kernel: arch/s390/include/uapi/asm/ptrace.h (s390_regs).  */
#define ELF_NREG 27
typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];

enum {
    TARGET_REG_PSWM = 0,
    TARGET_REG_PSWA = 1,
    TARGET_REG_GPRS = 2,
    TARGET_REG_ARS = 18,
    TARGET_REG_ORIG_R2 = 26,
};

static void elf_core_copy_regs(target_elf_gregset_t *regs,
                               const CPUS390XState *env)
{
    int i;
    uint32_t *aregs;

    (*regs)[TARGET_REG_PSWM] = tswapreg(env->psw.mask);
    (*regs)[TARGET_REG_PSWA] = tswapreg(env->psw.addr);
    for (i = 0; i < 16; i++) {
        (*regs)[TARGET_REG_GPRS + i] = tswapreg(env->regs[i]);
    }
    aregs = (uint32_t *)&((*regs)[TARGET_REG_ARS]);
    for (i = 0; i < 16; i++) {
        aregs[i] = tswap32(env->aregs[i]);
    }
    (*regs)[TARGET_REG_ORIG_R2] = 0;
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE 4096

#endif /* TARGET_S390X */

#ifdef TARGET_RISCV

#define ELF_ARCH  EM_RISCV

#ifdef TARGET_RISCV32
#define ELF_CLASS ELFCLASS32
#else
#define ELF_CLASS ELFCLASS64
#endif

#define ELF_HWCAP get_elf_hwcap()

static uint32_t get_elf_hwcap(void)
{
#define MISA_BIT(EXT) (1 << (EXT - 'A'))
    RISCVCPU *cpu = RISCV_CPU(thread_cpu);
    uint32_t mask = MISA_BIT('I') | MISA_BIT('M') | MISA_BIT('A')
                    | MISA_BIT('F') | MISA_BIT('D') | MISA_BIT('C')
                    | MISA_BIT('V');

    return cpu->env.misa_ext & mask;
#undef MISA_BIT
}

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    regs->sepc = infop->entry;
    regs->sp = infop->start_stack;
}

#define ELF_EXEC_PAGESIZE 4096

#endif /* TARGET_RISCV */

#ifdef TARGET_HPPA

#define ELF_CLASS       ELFCLASS32
#define ELF_ARCH        EM_PARISC
#define ELF_PLATFORM    "PARISC"
#define STACK_GROWS_DOWN 0
#define STACK_ALIGNMENT  64

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    regs->iaoq[0] = infop->entry;
    regs->iaoq[1] = infop->entry + 4;
    regs->gr[23] = 0;
    regs->gr[24] = infop->argv;
    regs->gr[25] = infop->argc;
    /* The top-of-stack contains a linkage buffer.  */
    regs->gr[30] = infop->start_stack + 64;
    regs->gr[31] = infop->entry;
}

#define LO_COMMPAGE  0

static bool init_guest_commpage(void)
{
    void *want = g2h_untagged(LO_COMMPAGE);
    void *addr = mmap(want, qemu_host_page_size, PROT_NONE,
                      MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);

    if (addr == MAP_FAILED) {
        perror("Allocating guest commpage");
        exit(EXIT_FAILURE);
    }
    if (addr != want) {
        return false;
    }

    /*
     * On Linux, page zero is normally marked execute only + gateway.
     * Normal read or write is supposed to fail (thus PROT_NONE above),
     * but specific offsets have kernel code mapped to raise permissions
     * and implement syscalls.  Here, simply mark the page executable.
     * Special case the entry points during translation (see do_page_zero).
     */
    page_set_flags(LO_COMMPAGE, LO_COMMPAGE | ~TARGET_PAGE_MASK,
                   PAGE_EXEC | PAGE_VALID);
    return true;
}

#endif /* TARGET_HPPA */

#ifdef TARGET_XTENSA

#define ELF_CLASS       ELFCLASS32
#define ELF_ARCH        EM_XTENSA

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    regs->windowbase = 0;
    regs->windowstart = 1;
    regs->areg[1] = infop->start_stack;
    regs->pc = infop->entry;
    if (info_is_fdpic(infop)) {
        regs->areg[4] = infop->loadmap_addr;
        regs->areg[5] = infop->interpreter_loadmap_addr;
        if (infop->interpreter_loadmap_addr) {
            regs->areg[6] = infop->interpreter_pt_dynamic_addr;
        } else {
            regs->areg[6] = infop->pt_dynamic_addr;
        }
    }
}

/* See linux kernel: arch/xtensa/include/asm/elf.h.  */
#define ELF_NREG 128
typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];

enum {
    TARGET_REG_PC,
    TARGET_REG_PS,
    TARGET_REG_LBEG,
    TARGET_REG_LEND,
    TARGET_REG_LCOUNT,
    TARGET_REG_SAR,
    TARGET_REG_WINDOWSTART,
    TARGET_REG_WINDOWBASE,
    TARGET_REG_THREADPTR,
    TARGET_REG_AR0 = 64,
};

static void elf_core_copy_regs(target_elf_gregset_t *regs,
                               const CPUXtensaState *env)
{
    unsigned i;

    (*regs)[TARGET_REG_PC] = tswapreg(env->pc);
    (*regs)[TARGET_REG_PS] = tswapreg(env->sregs[PS] & ~PS_EXCM);
    (*regs)[TARGET_REG_LBEG] = tswapreg(env->sregs[LBEG]);
    (*regs)[TARGET_REG_LEND] = tswapreg(env->sregs[LEND]);
    (*regs)[TARGET_REG_LCOUNT] = tswapreg(env->sregs[LCOUNT]);
    (*regs)[TARGET_REG_SAR] = tswapreg(env->sregs[SAR]);
    (*regs)[TARGET_REG_WINDOWSTART] = tswapreg(env->sregs[WINDOW_START]);
    (*regs)[TARGET_REG_WINDOWBASE] = tswapreg(env->sregs[WINDOW_BASE]);
    (*regs)[TARGET_REG_THREADPTR] = tswapreg(env->uregs[THREADPTR]);
    xtensa_sync_phys_from_window((CPUXtensaState *)env);
    for (i = 0; i < env->config->nareg; ++i) {
        (*regs)[TARGET_REG_AR0 + i] = tswapreg(env->phys_regs[i]);
    }
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE       4096

#endif /* TARGET_XTENSA */

#ifdef TARGET_HEXAGON

#define ELF_CLASS       ELFCLASS32
#define ELF_ARCH        EM_HEXAGON

static inline void init_thread(struct target_pt_regs *regs,
                               struct image_info *infop)
{
    regs->sepc = infop->entry;
    regs->sp = infop->start_stack;
}

#endif /* TARGET_HEXAGON */

#ifndef ELF_BASE_PLATFORM
#define ELF_BASE_PLATFORM (NULL)
#endif

#ifndef ELF_PLATFORM
#define ELF_PLATFORM (NULL)
#endif

#ifndef ELF_MACHINE
#define ELF_MACHINE ELF_ARCH
#endif

#ifndef elf_check_arch
#define elf_check_arch(x) ((x) == ELF_ARCH)
#endif

#ifndef elf_check_abi
#define elf_check_abi(x) (1)
#endif

#ifndef ELF_HWCAP
#define ELF_HWCAP 0
#endif

#ifndef STACK_GROWS_DOWN
#define STACK_GROWS_DOWN 1
#endif

#ifndef STACK_ALIGNMENT
#define STACK_ALIGNMENT 16
#endif

#ifdef TARGET_ABI32
#undef ELF_CLASS
#define ELF_CLASS ELFCLASS32
#undef bswaptls
#define bswaptls(ptr) bswap32s(ptr)
#endif

#ifndef EXSTACK_DEFAULT
#define EXSTACK_DEFAULT false
#endif

#include "elf.h"

/* We must delay the following stanzas until after "elf.h". */
#if defined(TARGET_AARCH64)

static bool arch_parse_elf_property(uint32_t pr_type, uint32_t pr_datasz,
                                    const uint32_t *data,
                                    struct image_info *info,
                                    Error **errp)
{
    if (pr_type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) {
        if (pr_datasz != sizeof(uint32_t)) {
            error_setg(errp, "Ill-formed GNU_PROPERTY_AARCH64_FEATURE_1_AND");
            return false;
        }
        /* We will extract GNU_PROPERTY_AARCH64_FEATURE_1_BTI later. */
        info->note_flags = *data;
    }
    return true;
}
#define ARCH_USE_GNU_PROPERTY 1

#else

static bool arch_parse_elf_property(uint32_t pr_type, uint32_t pr_datasz,
                                    const uint32_t *data,
                                    struct image_info *info,
                                    Error **errp)
{
    g_assert_not_reached();
}
#define ARCH_USE_GNU_PROPERTY 0

#endif

struct exec
{
    unsigned int a_info;   /* Use macros N_MAGIC, etc for access */
    unsigned int a_text;   /* length of text, in bytes */
    unsigned int a_data;   /* length of data, in bytes */
    unsigned int a_bss;    /* length of uninitialized data area, in bytes */
    unsigned int a_syms;   /* length of symbol table data in file, in bytes */
    unsigned int a_entry;  /* start address */
    unsigned int a_trsize; /* length of relocation info for text, in bytes */
    unsigned int a_drsize; /* length of relocation info for data, in bytes */
};


#define N_MAGIC(exec) ((exec).a_info & 0xffff)
#define OMAGIC 0407
#define NMAGIC 0410
#define ZMAGIC 0413
#define QMAGIC 0314

#define DLINFO_ITEMS 16

static inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
{
    memcpy(to, from, n);
}

#ifdef BSWAP_NEEDED
static void bswap_ehdr(struct elfhdr *ehdr)
{
    bswap16s(&ehdr->e_type);            /* Object file type */
    bswap16s(&ehdr->e_machine);         /* Architecture */
    bswap32s(&ehdr->e_version);         /* Object file version */
    bswaptls(&ehdr->e_entry);           /* Entry point virtual address */
    bswaptls(&ehdr->e_phoff);           /* Program header table file offset */
    bswaptls(&ehdr->e_shoff);           /* Section header table file offset */
    bswap32s(&ehdr->e_flags);           /* Processor-specific flags */
    bswap16s(&ehdr->e_ehsize);          /* ELF header size in bytes */
    bswap16s(&ehdr->e_phentsize);       /* Program header table entry size */
    bswap16s(&ehdr->e_phnum);           /* Program header table entry count */
    bswap16s(&ehdr->e_shentsize);       /* Section header table entry size */
    bswap16s(&ehdr->e_shnum);           /* Section header table entry count */
    bswap16s(&ehdr->e_shstrndx);        /* Section header string table index */
}

static void bswap_phdr(struct elf_phdr *phdr, int phnum)
{
    int i;
    for (i = 0; i < phnum; ++i, ++phdr) {
        bswap32s(&phdr->p_type);        /* Segment type */
        bswap32s(&phdr->p_flags);       /* Segment flags */
        bswaptls(&phdr->p_offset);      /* Segment file offset */
        bswaptls(&phdr->p_vaddr);       /* Segment virtual address */
        bswaptls(&phdr->p_paddr);       /* Segment physical address */
        bswaptls(&phdr->p_filesz);      /* Segment size in file */
        bswaptls(&phdr->p_memsz);       /* Segment size in memory */
        bswaptls(&phdr->p_align);       /* Segment alignment */
    }
}

static void bswap_shdr(struct elf_shdr *shdr, int shnum)
{
    int i;
    for (i = 0; i < shnum; ++i, ++shdr) {
        bswap32s(&shdr->sh_name);
        bswap32s(&shdr->sh_type);
        bswaptls(&shdr->sh_flags);
        bswaptls(&shdr->sh_addr);
        bswaptls(&shdr->sh_offset);
        bswaptls(&shdr->sh_size);
        bswap32s(&shdr->sh_link);
        bswap32s(&shdr->sh_info);
        bswaptls(&shdr->sh_addralign);
        bswaptls(&shdr->sh_entsize);
    }
}

static void bswap_sym(struct elf_sym *sym)
{
    bswap32s(&sym->st_name);
    bswaptls(&sym->st_value);
    bswaptls(&sym->st_size);
    bswap16s(&sym->st_shndx);
}

#ifdef TARGET_MIPS
static void bswap_mips_abiflags(Mips_elf_abiflags_v0 *abiflags)
{
    bswap16s(&abiflags->version);
    bswap32s(&abiflags->ases);
    bswap32s(&abiflags->isa_ext);
    bswap32s(&abiflags->flags1);
    bswap32s(&abiflags->flags2);
}
#endif
#else
static inline void bswap_ehdr(struct elfhdr *ehdr) { }
static inline void bswap_phdr(struct elf_phdr *phdr, int phnum) { }
static inline void bswap_shdr(struct elf_shdr *shdr, int shnum) { }
static inline void bswap_sym(struct elf_sym *sym) { }
#ifdef TARGET_MIPS
static inline void bswap_mips_abiflags(Mips_elf_abiflags_v0 *abiflags) { }
#endif
#endif

#ifdef USE_ELF_CORE_DUMP
static int elf_core_dump(int, const CPUArchState *);
#endif /* USE_ELF_CORE_DUMP */
static void load_symbols(struct elfhdr *hdr, const ImageSource *src,
                         abi_ulong load_bias);

/* Verify the portions of EHDR within E_IDENT for the target.
   This can be performed before bswapping the entire header.  */
static bool elf_check_ident(struct elfhdr *ehdr)
{
    return (ehdr->e_ident[EI_MAG0] == ELFMAG0
            && ehdr->e_ident[EI_MAG1] == ELFMAG1
            && ehdr->e_ident[EI_MAG2] == ELFMAG2
            && ehdr->e_ident[EI_MAG3] == ELFMAG3
            && ehdr->e_ident[EI_CLASS] == ELF_CLASS
            && ehdr->e_ident[EI_DATA] == ELF_DATA
            && ehdr->e_ident[EI_VERSION] == EV_CURRENT);
}

/* Verify the portions of EHDR outside of E_IDENT for the target.
   This has to wait until after bswapping the header.  */
static bool elf_check_ehdr(struct elfhdr *ehdr)
{
    return (elf_check_arch(ehdr->e_machine)
            && elf_check_abi(ehdr->e_flags)
            && ehdr->e_ehsize == sizeof(struct elfhdr)
            && ehdr->e_phentsize == sizeof(struct elf_phdr)
            && (ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN));
}

/*
 * 'copy_elf_strings()' copies argument/envelope strings from user
 * memory to free pages in kernel mem. These are in a format ready
 * to be put directly into the top of new user memory.
 *
 */
static abi_ulong copy_elf_strings(int argc, char **argv, char *scratch,
                                  abi_ulong p, abi_ulong stack_limit)
{
    char *tmp;
    int len, i;
    abi_ulong top = p;

    if (!p) {
        return 0;       /* bullet-proofing */
    }

    if (STACK_GROWS_DOWN) {
        int offset = ((p - 1) % TARGET_PAGE_SIZE) + 1;
        for (i = argc - 1; i >= 0; --i) {
            tmp = argv[i];
            if (!tmp) {
                fprintf(stderr, "VFS: argc is wrong");
                exit(-1);
            }
            len = strlen(tmp) + 1;
            tmp += len;

            if (len > (p - stack_limit)) {
                return 0;
            }
            while (len) {
                int bytes_to_copy = (len > offset) ? offset : len;
                tmp -= bytes_to_copy;
                p -= bytes_to_copy;
                offset -= bytes_to_copy;
                len -= bytes_to_copy;

                memcpy_fromfs(scratch + offset, tmp, bytes_to_copy);

                if (offset == 0) {
                    memcpy_to_target(p, scratch, top - p);
                    top = p;
                    offset = TARGET_PAGE_SIZE;
                }
            }
        }
        if (p != top) {
            memcpy_to_target(p, scratch + offset, top - p);
        }
    } else {
        int remaining = TARGET_PAGE_SIZE - (p % TARGET_PAGE_SIZE);
        for (i = 0; i < argc; ++i) {
            tmp = argv[i];
            if (!tmp) {
                fprintf(stderr, "VFS: argc is wrong");
                exit(-1);
            }
            len = strlen(tmp) + 1;
            if (len > (stack_limit - p)) {
                return 0;
            }
            while (len) {
                int bytes_to_copy = (len > remaining) ? remaining : len;

                memcpy_fromfs(scratch + (p - top), tmp, bytes_to_copy);

                tmp += bytes_to_copy;
                remaining -= bytes_to_copy;
                p += bytes_to_copy;
                len -= bytes_to_copy;

                if (remaining == 0) {
                    memcpy_to_target(top, scratch, p - top);
                    top = p;
                    remaining = TARGET_PAGE_SIZE;
                }
            }
        }
        if (p != top) {
            memcpy_to_target(top, scratch, p - top);
        }
    }

    return p;
}

/* Older linux kernels provide up to MAX_ARG_PAGES (default: 32) of
 * argument/environment space. Newer kernels (>2.6.33) allow more,
 * dependent on stack size, but guarantee at least 32 pages for
 * backwards compatibility.
 */
#define STACK_LOWER_LIMIT (32 * TARGET_PAGE_SIZE)

static abi_ulong setup_arg_pages(struct linux_binprm *bprm,
                                 struct image_info *info)
{
    abi_ulong size, error, guard;
    int prot;

    size = guest_stack_size;
    if (size < STACK_LOWER_LIMIT) {
        size = STACK_LOWER_LIMIT;
    }

    if (STACK_GROWS_DOWN) {
        guard = TARGET_PAGE_SIZE;
        if (guard < qemu_real_host_page_size()) {
            guard = qemu_real_host_page_size();
        }
    } else {
        /* no guard page for hppa target where stack grows upwards. */
        guard = 0;
    }

    prot = PROT_READ | PROT_WRITE;
    if (info->exec_stack) {
        prot |= PROT_EXEC;
    }
    error = target_mmap(0, size + guard, prot,
                        MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
    if (error == -1) {
        perror("mmap stack");
        exit(-1);
    }

    /* We reserve one extra page at the top of the stack as guard.  */
    if (STACK_GROWS_DOWN) {
        target_mprotect(error, guard, PROT_NONE);
        info->stack_limit = error + guard;
        return info->stack_limit + size - sizeof(void *);
    } else {
        info->stack_limit = error + size;
        return error;
    }
}

/**
 * zero_bss:
 *
 * Map and zero the bss.  We need to explicitly zero any fractional pages
 * after the data section (i.e. bss).  Return false on mapping failure.
 */
static bool zero_bss(abi_ulong start_bss, abi_ulong end_bss,
                     int prot, Error **errp)
{
    abi_ulong align_bss;

    /* We only expect writable bss; the code segment shouldn't need this. */
    if (!(prot & PROT_WRITE)) {
        error_setg(errp, "PT_LOAD with non-writable bss");
        return false;
    }

    align_bss = TARGET_PAGE_ALIGN(start_bss);
    end_bss = TARGET_PAGE_ALIGN(end_bss);

    if (start_bss < align_bss) {
        int flags = page_get_flags(start_bss);

        if (!(flags & PAGE_BITS)) {
            /*
             * The whole address space of the executable was reserved
             * at the start, therefore all pages will be VALID.
             * But assuming there are no PROT_NONE PT_LOAD segments,
             * a PROT_NONE page means no data all bss, and we can
             * simply extend the new anon mapping back to the start
             * of the page of bss.
             */
            align_bss -= TARGET_PAGE_SIZE;
        } else {
            /*
             * The start of the bss shares a page with something.
             * The only thing that we expect is the data section,
             * which would already be marked writable.
             * Overlapping the RX code segment seems malformed.
             */
            if (!(flags & PAGE_WRITE)) {
                error_setg(errp, "PT_LOAD with bss overlapping "
                           "non-writable page");
                return false;
            }

            /* The page is already mapped and writable. */
            memset(g2h_untagged(start_bss), 0, align_bss - start_bss);
        }
    }

    if (align_bss < end_bss &&
        target_mmap(align_bss, end_bss - align_bss, prot,
                    MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == -1) {
        error_setg_errno(errp, errno, "Error mapping bss");
        return false;
    }
    return true;
}

#if defined(TARGET_ARM)
static int elf_is_fdpic(struct elfhdr *exec)
{
    return exec->e_ident[EI_OSABI] == ELFOSABI_ARM_FDPIC;
}
#elif defined(TARGET_XTENSA)
static int elf_is_fdpic(struct elfhdr *exec)
{
    return exec->e_ident[EI_OSABI] == ELFOSABI_XTENSA_FDPIC;
}
#else
/* Default implementation, always false.  */
static int elf_is_fdpic(struct elfhdr *exec)
{
    return 0;
}
#endif

static abi_ulong loader_build_fdpic_loadmap(struct image_info *info, abi_ulong sp)
{
    uint16_t n;
    struct elf32_fdpic_loadseg *loadsegs = info->loadsegs;

    /* elf32_fdpic_loadseg */
    n = info->nsegs;
    while (n--) {
        sp -= 12;
        put_user_u32(loadsegs[n].addr, sp+0);
        put_user_u32(loadsegs[n].p_vaddr, sp+4);
        put_user_u32(loadsegs[n].p_memsz, sp+8);
    }

    /* elf32_fdpic_loadmap */
    sp -= 4;
    put_user_u16(0, sp+0); /* version */
    put_user_u16(info->nsegs, sp+2); /* nsegs */

    info->personality = PER_LINUX_FDPIC;
    info->loadmap_addr = sp;

    return sp;
}

static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
                                   struct elfhdr *exec,
                                   struct image_info *info,
                                   struct image_info *interp_info,
                                   struct image_info *vdso_info)
{
    abi_ulong sp;
    abi_ulong u_argc, u_argv, u_envp, u_auxv;
    int size;
    int i;
    abi_ulong u_rand_bytes;
    uint8_t k_rand_bytes[16];
    abi_ulong u_platform, u_base_platform;
    const char *k_platform, *k_base_platform;
    const int n = sizeof(elf_addr_t);

    sp = p;

    /* Needs to be before we load the env/argc/... */
    if (elf_is_fdpic(exec)) {
        /* Need 4 byte alignment for these structs */
        sp &= ~3;
        sp = loader_build_fdpic_loadmap(info, sp);
        info->other_info = interp_info;
        if (interp_info) {
            interp_info->other_info = info;
            sp = loader_build_fdpic_loadmap(interp_info, sp);
            info->interpreter_loadmap_addr = interp_info->loadmap_addr;
            info->interpreter_pt_dynamic_addr = interp_info->pt_dynamic_addr;
        } else {
            info->interpreter_loadmap_addr = 0;
            info->interpreter_pt_dynamic_addr = 0;
        }
    }

    u_base_platform = 0;
    k_base_platform = ELF_BASE_PLATFORM;
    if (k_base_platform) {
        size_t len = strlen(k_base_platform) + 1;
        if (STACK_GROWS_DOWN) {
            sp -= (len + n - 1) & ~(n - 1);
            u_base_platform = sp;
            /* FIXME - check return value of memcpy_to_target() for failure */
            memcpy_to_target(sp, k_base_platform, len);
        } else {
            memcpy_to_target(sp, k_base_platform, len);
            u_base_platform = sp;
            sp += len + 1;
        }
    }

    u_platform = 0;
    k_platform = ELF_PLATFORM;
    if (k_platform) {
        size_t len = strlen(k_platform) + 1;
        if (STACK_GROWS_DOWN) {
            sp -= (len + n - 1) & ~(n - 1);
            u_platform = sp;
            /* FIXME - check return value of memcpy_to_target() for failure */
            memcpy_to_target(sp, k_platform, len);
        } else {
            memcpy_to_target(sp, k_platform, len);
            u_platform = sp;
            sp += len + 1;
        }
    }

    /* Provide 16 byte alignment for the PRNG, and basic alignment for
     * the argv and envp pointers.
     */
    if (STACK_GROWS_DOWN) {
        sp = QEMU_ALIGN_DOWN(sp, 16);
    } else {
        sp = QEMU_ALIGN_UP(sp, 16);
    }

    /*
     * Generate 16 random bytes for userspace PRNG seeding.
     */
    qemu_guest_getrandom_nofail(k_rand_bytes, sizeof(k_rand_bytes));
    if (STACK_GROWS_DOWN) {
        sp -= 16;
        u_rand_bytes = sp;
        /* FIXME - check return value of memcpy_to_target() for failure */
        memcpy_to_target(sp, k_rand_bytes, 16);
    } else {
        memcpy_to_target(sp, k_rand_bytes, 16);
        u_rand_bytes = sp;
        sp += 16;
    }

    size = (DLINFO_ITEMS + 1) * 2;
    if (k_base_platform) {
        size += 2;
    }
    if (k_platform) {
        size += 2;
    }
    if (vdso_info) {
        size += 2;
    }
#ifdef DLINFO_ARCH_ITEMS
    size += DLINFO_ARCH_ITEMS * 2;
#endif
#ifdef ELF_HWCAP2
    size += 2;
#endif
    info->auxv_len = size * n;

    size += envc + argc + 2;
    size += 1;  /* argc itself */
    size *= n;

    /* Allocate space and finalize stack alignment for entry now.  */
    if (STACK_GROWS_DOWN) {
        u_argc = QEMU_ALIGN_DOWN(sp - size, STACK_ALIGNMENT);
        sp = u_argc;
    } else {
        u_argc = sp;
        sp = QEMU_ALIGN_UP(sp + size, STACK_ALIGNMENT);
    }

    u_argv = u_argc + n;
    u_envp = u_argv + (argc + 1) * n;
    u_auxv = u_envp + (envc + 1) * n;
    info->saved_auxv = u_auxv;
    info->argc = argc;
    info->envc = envc;
    info->argv = u_argv;
    info->envp = u_envp;

    /* This is correct because Linux defines
     * elf_addr_t as Elf32_Off / Elf64_Off
     */
#define NEW_AUX_ENT(id, val) do {               \
        put_user_ual(id, u_auxv);  u_auxv += n; \
        put_user_ual(val, u_auxv); u_auxv += n; \
    } while(0)

#ifdef ARCH_DLINFO
    /*
     * ARCH_DLINFO must come first so platform specific code can enforce
     * special alignment requirements on the AUXV if necessary (eg. PPC).
     */
    ARCH_DLINFO;
#endif
    /* There must be exactly DLINFO_ITEMS entries here, or the assert
     * on info->auxv_len will trigger.
     */
    NEW_AUX_ENT(AT_PHDR, (abi_ulong)(info->load_addr + exec->e_phoff));
    NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr)));
    NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
    if ((info->alignment & ~qemu_host_page_mask) != 0) {
        /* Target doesn't support host page size alignment */
        NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
    } else {
        NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(MAX(TARGET_PAGE_SIZE,
                                               qemu_host_page_size)));
    }
    NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_info ? interp_info->load_addr : 0));
    NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
    NEW_AUX_ENT(AT_ENTRY, info->entry);
    NEW_AUX_ENT(AT_UID, (abi_ulong) getuid());
    NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid());
    NEW_AUX_ENT(AT_GID, (abi_ulong) getgid());
    NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid());
    NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP);
    NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK));
    NEW_AUX_ENT(AT_RANDOM, (abi_ulong) u_rand_bytes);
    NEW_AUX_ENT(AT_SECURE, (abi_ulong) qemu_getauxval(AT_SECURE));
    NEW_AUX_ENT(AT_EXECFN, info->file_string);

#ifdef ELF_HWCAP2
    NEW_AUX_ENT(AT_HWCAP2, (abi_ulong) ELF_HWCAP2);
#endif

    if (u_base_platform) {
        NEW_AUX_ENT(AT_BASE_PLATFORM, u_base_platform);
    }
    if (u_platform) {
        NEW_AUX_ENT(AT_PLATFORM, u_platform);
    }
    if (vdso_info) {
        NEW_AUX_ENT(AT_SYSINFO_EHDR, vdso_info->load_addr);
    }
    NEW_AUX_ENT (AT_NULL, 0);
#undef NEW_AUX_ENT

    /* Check that our initial calculation of the auxv length matches how much
     * we actually put into it.
     */
    assert(info->auxv_len == u_auxv - info->saved_auxv);

    put_user_ual(argc, u_argc);

    p = info->arg_strings;
    for (i = 0; i < argc; ++i) {
        put_user_ual(p, u_argv);
        u_argv += n;
        p += target_strlen(p) + 1;
    }
    put_user_ual(0, u_argv);

    p = info->env_strings;
    for (i = 0; i < envc; ++i) {
        put_user_ual(p, u_envp);
        u_envp += n;
        p += target_strlen(p) + 1;
    }
    put_user_ual(0, u_envp);

    return sp;
}

#if defined(HI_COMMPAGE)
#define LO_COMMPAGE -1
#elif defined(LO_COMMPAGE)
#define HI_COMMPAGE 0
#else
#define HI_COMMPAGE 0
#define LO_COMMPAGE -1
#ifndef INIT_GUEST_COMMPAGE
#define init_guest_commpage() true
#endif
#endif

/**
 * pgb_try_mmap:
 * @addr: host start address
 * @addr_last: host last address
 * @keep: do not unmap the probe region
 *
 * Return 1 if [@addr, @addr_last] is not mapped in the host,
 * return 0 if it is not available to map, and -1 on mmap error.
 * If @keep, the region is left mapped on success, otherwise unmapped.
 */
static int pgb_try_mmap(uintptr_t addr, uintptr_t addr_last, bool keep)
{
    size_t size = addr_last - addr + 1;
    void *p = mmap((void *)addr, size, PROT_NONE,
                   MAP_ANONYMOUS | MAP_PRIVATE |
                   MAP_NORESERVE | MAP_FIXED_NOREPLACE, -1, 0);
    int ret;

    if (p == MAP_FAILED) {
        return errno == EEXIST ? 0 : -1;
    }
    ret = p == (void *)addr;
    if (!keep || !ret) {
        munmap(p, size);
    }
    return ret;
}

/**
 * pgb_try_mmap_skip_brk(uintptr_t addr, uintptr_t size, uintptr_t brk)
 * @addr: host address
 * @addr_last: host last address
 * @brk: host brk
 *
 * Like pgb_try_mmap, but additionally reserve some memory following brk.
 */
static int pgb_try_mmap_skip_brk(uintptr_t addr, uintptr_t addr_last,
                                 uintptr_t brk, bool keep)
{
    uintptr_t brk_last = brk + 16 * MiB - 1;

    /* Do not map anything close to the host brk. */
    if (addr <= brk_last && brk <= addr_last) {
        return 0;
    }
    return pgb_try_mmap(addr, addr_last, keep);
}

/**
 * pgb_try_mmap_set:
 * @ga: set of guest addrs
 * @base: guest_base
 * @brk: host brk
 *
 * Return true if all @ga can be mapped by the host at @base.
 * On success, retain the mapping at index 0 for reserved_va.
 */

typedef struct PGBAddrs {
    uintptr_t bounds[3][2]; /* start/last pairs */
    int nbounds;
} PGBAddrs;

static bool pgb_try_mmap_set(const PGBAddrs *ga, uintptr_t base, uintptr_t brk)
{
    for (int i = ga->nbounds - 1; i >= 0; --i) {
        if (pgb_try_mmap_skip_brk(ga->bounds[i][0] + base,
                                  ga->bounds[i][1] + base,
                                  brk, i == 0 && reserved_va) <= 0) {
            return false;
        }
    }
    return true;
}

/**
 * pgb_addr_set:
 * @ga: output set of guest addrs
 * @guest_loaddr: guest image low address
 * @guest_loaddr: guest image high address
 * @identity: create for identity mapping
 *
 * Fill in @ga with the image, COMMPAGE and NULL page.
 */
static bool pgb_addr_set(PGBAddrs *ga, abi_ulong guest_loaddr,
                         abi_ulong guest_hiaddr, bool try_identity)
{
    int n;

    /*
     * With a low commpage, or a guest mapped very low,
     * we may not be able to use the identity map.
     */
    if (try_identity) {
        if (LO_COMMPAGE != -1 && LO_COMMPAGE < mmap_min_addr) {
            return false;
        }
        if (guest_loaddr != 0 && guest_loaddr < mmap_min_addr) {
            return false;
        }
    }

    memset(ga, 0, sizeof(*ga));
    n = 0;

    if (reserved_va) {
        ga->bounds[n][0] = try_identity ? mmap_min_addr : 0;
        ga->bounds[n][1] = reserved_va;
        n++;
        /* LO_COMMPAGE and NULL handled by reserving from 0. */
    } else {
        /* Add any LO_COMMPAGE or NULL page. */
        if (LO_COMMPAGE != -1) {
            ga->bounds[n][0] = 0;
            ga->bounds[n][1] = LO_COMMPAGE + TARGET_PAGE_SIZE - 1;
            n++;
        } else if (!try_identity) {
            ga->bounds[n][0] = 0;
            ga->bounds[n][1] = TARGET_PAGE_SIZE - 1;
            n++;
        }

        /* Add the guest image for ET_EXEC. */
        if (guest_loaddr) {
            ga->bounds[n][0] = guest_loaddr;
            ga->bounds[n][1] = guest_hiaddr;
            n++;
        }
    }

    /*
     * Temporarily disable
     *   "comparison is always false due to limited range of data type"
     * due to comparison between unsigned and (possible) 0.
     */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wtype-limits"

    /* Add any HI_COMMPAGE not covered by reserved_va. */
    if (reserved_va < HI_COMMPAGE) {
        ga->bounds[n][0] = HI_COMMPAGE & qemu_host_page_mask;
        ga->bounds[n][1] = HI_COMMPAGE + TARGET_PAGE_SIZE - 1;
        n++;
    }

#pragma GCC diagnostic pop

    ga->nbounds = n;
    return true;
}

static void pgb_fail_in_use(const char *image_name)
{
    error_report("%s: requires virtual address space that is in use "
                 "(omit the -B option or choose a different value)",
                 image_name);
    exit(EXIT_FAILURE);
}

static void pgb_fixed(const char *image_name, uintptr_t guest_loaddr,
                      uintptr_t guest_hiaddr, uintptr_t align)
{
    PGBAddrs ga;
    uintptr_t brk = (uintptr_t)sbrk(0);

    if (!QEMU_IS_ALIGNED(guest_base, align)) {
        fprintf(stderr, "Requested guest base %p does not satisfy "
                "host minimum alignment (0x%" PRIxPTR ")\n",
                (void *)guest_base, align);
        exit(EXIT_FAILURE);
    }

    if (!pgb_addr_set(&ga, guest_loaddr, guest_hiaddr, !guest_base)
        || !pgb_try_mmap_set(&ga, guest_base, brk)) {
        pgb_fail_in_use(image_name);
    }
}

/**
 * pgb_find_fallback:
 *
 * This is a fallback method for finding holes in the host address space
 * if we don't have the benefit of being able to access /proc/self/map.
 * It can potentially take a very long time as we can only dumbly iterate
 * up the host address space seeing if the allocation would work.
 */
static uintptr_t pgb_find_fallback(const PGBAddrs *ga, uintptr_t align,
                                   uintptr_t brk)
{
    /* TODO: come up with a better estimate of how much to skip. */
    uintptr_t skip = sizeof(uintptr_t) == 4 ? MiB : GiB;

    for (uintptr_t base = skip; ; base += skip) {
        base = ROUND_UP(base, align);
        if (pgb_try_mmap_set(ga, base, brk)) {
            return base;
        }
        if (base >= -skip) {
            return -1;
        }
    }
}

static uintptr_t pgb_try_itree(const PGBAddrs *ga, uintptr_t base,
                               IntervalTreeRoot *root)
{
    for (int i = ga->nbounds - 1; i >= 0; --i) {
        uintptr_t s = base + ga->bounds[i][0];
        uintptr_t l = base + ga->bounds[i][1];
        IntervalTreeNode *n;

        if (l < s) {
            /* Wraparound. Skip to advance S to mmap_min_addr. */
            return mmap_min_addr - s;
        }

        n = interval_tree_iter_first(root, s, l);
        if (n != NULL) {
            /* Conflict.  Skip to advance S to LAST + 1. */
            return n->last - s + 1;
        }
    }
    return 0;  /* success */
}

static uintptr_t pgb_find_itree(const PGBAddrs *ga, IntervalTreeRoot *root,
                                uintptr_t align, uintptr_t brk)
{
    uintptr_t last = mmap_min_addr;
    uintptr_t base, skip;

    while (true) {
        base = ROUND_UP(last, align);
        if (base < last) {
            return -1;
        }

        skip = pgb_try_itree(ga, base, root);
        if (skip == 0) {
            break;
        }

        last = base + skip;
        if (last < base) {
            return -1;
        }
    }

    /*
     * We've chosen 'base' based on holes in the interval tree,
     * but we don't yet know if it is a valid host address.
     * Because it is the first matching hole, if the host addresses
     * are invalid we know there are no further matches.
     */
    return pgb_try_mmap_set(ga, base, brk) ? base : -1;
}

static void pgb_dynamic(const char *image_name, uintptr_t guest_loaddr,
                        uintptr_t guest_hiaddr, uintptr_t align)
{
    IntervalTreeRoot *root;
    uintptr_t brk, ret;
    PGBAddrs ga;

    assert(QEMU_IS_ALIGNED(guest_loaddr, align));

    /* Try the identity map first. */
    if (pgb_addr_set(&ga, guest_loaddr, guest_hiaddr, true)) {
        brk = (uintptr_t)sbrk(0);
        if (pgb_try_mmap_set(&ga, 0, brk)) {
            guest_base = 0;
            return;
        }
    }

    /*
     * Rebuild the address set for non-identity map.
     * This differs in the mapping of the guest NULL page.
     */
    pgb_addr_set(&ga, guest_loaddr, guest_hiaddr, false);

    root = read_self_maps();

    /* Read brk after we've read the maps, which will malloc. */
    brk = (uintptr_t)sbrk(0);

    if (!root) {
        ret = pgb_find_fallback(&ga, align, brk);
    } else {
        /*
         * Reserve the area close to the host brk.
         * This will be freed with the rest of the tree.
         */
        IntervalTreeNode *b = g_new0(IntervalTreeNode, 1);
        b->start = brk;
        b->last = brk + 16 * MiB - 1;
        interval_tree_insert(b, root);

        ret = pgb_find_itree(&ga, root, align, brk);
        free_self_maps(root);
    }

    if (ret == -1) {
        int w = TARGET_LONG_BITS / 4;

        error_report("%s: Unable to find a guest_base to satisfy all "
                     "guest address mapping requirements", image_name);

        for (int i = 0; i < ga.nbounds; ++i) {
            error_printf("  %0*" PRIx64 "-%0*" PRIx64 "\n",
                         w, (uint64_t)ga.bounds[i][0],
                         w, (uint64_t)ga.bounds[i][1]);
        }
        exit(EXIT_FAILURE);
    }
    guest_base = ret;
}

void probe_guest_base(const char *image_name, abi_ulong guest_loaddr,
                      abi_ulong guest_hiaddr)
{
    /* In order to use host shmat, we must be able to honor SHMLBA.  */
    uintptr_t align = MAX(SHMLBA, qemu_host_page_size);

    /* Sanity check the guest binary. */
    if (reserved_va) {
        if (guest_hiaddr > reserved_va) {
            error_report("%s: requires more than reserved virtual "
                         "address space (0x%" PRIx64 " > 0x%lx)",
                         image_name, (uint64_t)guest_hiaddr, reserved_va);
            exit(EXIT_FAILURE);
        }
    } else {
        if (guest_hiaddr != (uintptr_t)guest_hiaddr) {
            error_report("%s: requires more virtual address space "
                         "than the host can provide (0x%" PRIx64 ")",
                         image_name, (uint64_t)guest_hiaddr + 1);
            exit(EXIT_FAILURE);
        }
    }

    if (have_guest_base) {
        pgb_fixed(image_name, guest_loaddr, guest_hiaddr, align);
    } else {
        pgb_dynamic(image_name, guest_loaddr, guest_hiaddr, align);
    }

    /* Reserve and initialize the commpage. */
    if (!init_guest_commpage()) {
        /* We have already probed for the commpage being free. */
        g_assert_not_reached();
    }

    assert(QEMU_IS_ALIGNED(guest_base, align));
    qemu_log_mask(CPU_LOG_PAGE, "Locating guest address space "
                  "@ 0x%" PRIx64 "\n", (uint64_t)guest_base);
}

enum {
    /* The string "GNU\0" as a magic number. */
    GNU0_MAGIC = const_le32('G' | 'N' << 8 | 'U' << 16),
    NOTE_DATA_SZ = 1 * KiB,
    NOTE_NAME_SZ = 4,
    ELF_GNU_PROPERTY_ALIGN = ELF_CLASS == ELFCLASS32 ? 4 : 8,
};

/*
 * Process a single gnu_property entry.
 * Return false for error.
 */
static bool parse_elf_property(const uint32_t *data, int *off, int datasz,
                               struct image_info *info, bool have_prev_type,
                               uint32_t *prev_type, Error **errp)
{
    uint32_t pr_type, pr_datasz, step;

    if (*off > datasz || !QEMU_IS_ALIGNED(*off, ELF_GNU_PROPERTY_ALIGN)) {
        goto error_data;
    }
    datasz -= *off;
    data += *off / sizeof(uint32_t);

    if (datasz < 2 * sizeof(uint32_t)) {
        goto error_data;
    }
    pr_type = data[0];
    pr_datasz = data[1];
    data += 2;
    datasz -= 2 * sizeof(uint32_t);
    step = ROUND_UP(pr_datasz, ELF_GNU_PROPERTY_ALIGN);
    if (step > datasz) {
        goto error_data;
    }

    /* Properties are supposed to be unique and sorted on pr_type. */
    if (have_prev_type && pr_type <= *prev_type) {
        if (pr_type == *prev_type) {
            error_setg(errp, "Duplicate property in PT_GNU_PROPERTY");
        } else {
            error_setg(errp, "Unsorted property in PT_GNU_PROPERTY");
        }
        return false;
    }
    *prev_type = pr_type;

    if (!arch_parse_elf_property(pr_type, pr_datasz, data, info, errp)) {
        return false;
    }

    *off += 2 * sizeof(uint32_t) + step;
    return true;

 error_data:
    error_setg(errp, "Ill-formed property in PT_GNU_PROPERTY");
    return false;
}

/* Process NT_GNU_PROPERTY_TYPE_0. */
static bool parse_elf_properties(const ImageSource *src,
                                 struct image_info *info,
                                 const struct elf_phdr *phdr,
                                 Error **errp)
{
    union {
        struct elf_note nhdr;
        uint32_t data[NOTE_DATA_SZ / sizeof(uint32_t)];
    } note;

    int n, off, datasz;
    bool have_prev_type;
    uint32_t prev_type;

    /* Unless the arch requires properties, ignore them. */
    if (!ARCH_USE_GNU_PROPERTY) {
        return true;
    }

    /* If the properties are crazy large, that's too bad. */
    n = phdr->p_filesz;
    if (n > sizeof(note)) {
        error_setg(errp, "PT_GNU_PROPERTY too large");
        return false;
    }
    if (n < sizeof(note.nhdr)) {
        error_setg(errp, "PT_GNU_PROPERTY too small");
        return false;
    }

    if (!imgsrc_read(&note, phdr->p_offset, n, src, errp)) {
        return false;
    }

    /*
     * The contents of a valid PT_GNU_PROPERTY is a sequence
     * of uint32_t -- swap them all now.
     */
#ifdef BSWAP_NEEDED
    for (int i = 0; i < n / 4; i++) {
        bswap32s(note.data + i);
    }
#endif

    /*
     * Note that nhdr is 3 words, and that the "name" described by namesz
     * immediately follows nhdr and is thus at the 4th word.  Further, all
     * of the inputs to the kernel's round_up are multiples of 4.
     */
    if (note.nhdr.n_type != NT_GNU_PROPERTY_TYPE_0 ||
        note.nhdr.n_namesz != NOTE_NAME_SZ ||
        note.data[3] != GNU0_MAGIC) {
        error_setg(errp, "Invalid note in PT_GNU_PROPERTY");
        return false;
    }
    off = sizeof(note.nhdr) + NOTE_NAME_SZ;

    datasz = note.nhdr.n_descsz + off;
    if (datasz > n) {
        error_setg(errp, "Invalid note size in PT_GNU_PROPERTY");
        return false;
    }

    have_prev_type = false;
    prev_type = 0;
    while (1) {
        if (off == datasz) {
            return true;  /* end, exit ok */
        }
        if (!parse_elf_property(note.data, &off, datasz, info,
                                have_prev_type, &prev_type, errp)) {
            return false;
        }
        have_prev_type = true;
    }
}

/**
 * load_elf_image: Load an ELF image into the address space.
 * @image_name: the filename of the image, to use in error messages.
 * @src: the ImageSource from which to read.
 * @info: info collected from the loaded image.
 * @ehdr: the ELF header, not yet bswapped.
 * @pinterp_name: record any PT_INTERP string found.
 *
 * On return: @info values will be filled in, as necessary or available.
 */

static void load_elf_image(const char *image_name, const ImageSource *src,
                           struct image_info *info, struct elfhdr *ehdr,
                           char **pinterp_name)
{
    g_autofree struct elf_phdr *phdr = NULL;
    abi_ulong load_addr, load_bias, loaddr, hiaddr, error;
    int i, prot_exec;
    Error *err = NULL;

    /*
     * First of all, some simple consistency checks.
     * Note that we rely on the bswapped ehdr staying in bprm_buf,
     * for later use by load_elf_binary and create_elf_tables.
     */
    if (!imgsrc_read(ehdr, 0, sizeof(*ehdr), src, &err)) {
        goto exit_errmsg;
    }
    if (!elf_check_ident(ehdr)) {
        error_setg(&err, "Invalid ELF image for this architecture");
        goto exit_errmsg;
    }
    bswap_ehdr(ehdr);
    if (!elf_check_ehdr(ehdr)) {
        error_setg(&err, "Invalid ELF image for this architecture");
        goto exit_errmsg;
    }

    phdr = imgsrc_read_alloc(ehdr->e_phoff,
                             ehdr->e_phnum * sizeof(struct elf_phdr),
                             src, &err);
    if (phdr == NULL) {
        goto exit_errmsg;
    }
    bswap_phdr(phdr, ehdr->e_phnum);

    info->nsegs = 0;
    info->pt_dynamic_addr = 0;

    mmap_lock();

    /*
     * Find the maximum size of the image and allocate an appropriate
     * amount of memory to handle that.  Locate the interpreter, if any.
     */
    loaddr = -1, hiaddr = 0;
    info->alignment = 0;
    info->exec_stack = EXSTACK_DEFAULT;
    for (i = 0; i < ehdr->e_phnum; ++i) {
        struct elf_phdr *eppnt = phdr + i;
        if (eppnt->p_type == PT_LOAD) {
            abi_ulong a = eppnt->p_vaddr - eppnt->p_offset;
            if (a < loaddr) {
                loaddr = a;
            }
            a = eppnt->p_vaddr + eppnt->p_memsz - 1;
            if (a > hiaddr) {
                hiaddr = a;
            }
            ++info->nsegs;
            info->alignment |= eppnt->p_align;
        } else if (eppnt->p_type == PT_INTERP && pinterp_name) {
            g_autofree char *interp_name = NULL;

            if (*pinterp_name) {
                error_setg(&err, "Multiple PT_INTERP entries");
                goto exit_errmsg;
            }

            interp_name = imgsrc_read_alloc(eppnt->p_offset, eppnt->p_filesz,
                                            src, &err);
            if (interp_name == NULL) {
                goto exit_errmsg;
            }
            if (interp_name[eppnt->p_filesz - 1] != 0) {
                error_setg(&err, "Invalid PT_INTERP entry");
                goto exit_errmsg;
            }
            *pinterp_name = g_steal_pointer(&interp_name);
        } else if (eppnt->p_type == PT_GNU_PROPERTY) {
            if (!parse_elf_properties(src, info, eppnt, &err)) {
                goto exit_errmsg;
            }
        } else if (eppnt->p_type == PT_GNU_STACK) {
            info->exec_stack = eppnt->p_flags & PF_X;
        }
    }

    load_addr = loaddr;

    if (pinterp_name != NULL) {
        if (ehdr->e_type == ET_EXEC) {
            /*
             * Make sure that the low address does not conflict with
             * MMAP_MIN_ADDR or the QEMU application itself.
             */
            probe_guest_base(image_name, loaddr, hiaddr);
        } else {
            abi_ulong align;

            /*
             * The binary is dynamic, but we still need to
             * select guest_base.  In this case we pass a size.
             */
            probe_guest_base(image_name, 0, hiaddr - loaddr);

            /*
             * Avoid collision with the loader by providing a different
             * default load address.
             */
            load_addr += elf_et_dyn_base;

            /*
             * TODO: Better support for mmap alignment is desirable.
             * Since we do not have complete control over the guest
             * address space, we prefer the kernel to choose some address
             * rather than force the use of LOAD_ADDR via MAP_FIXED.
             * But without MAP_FIXED we cannot guarantee alignment,
             * only suggest it.
             */
            align = pow2ceil(info->alignment);
            if (align) {
                load_addr &= -align;
            }
        }
    }

    /*
     * Reserve address space for all of this.
     *
     * In the case of ET_EXEC, we supply MAP_FIXED_NOREPLACE so that we get
     * exactly the address range that is required.  Without reserved_va,
     * the guest address space is not isolated.  We have attempted to avoid
     * conflict with the host program itself via probe_guest_base, but using
     * MAP_FIXED_NOREPLACE instead of MAP_FIXED provides an extra check.
     *
     * Otherwise this is ET_DYN, and we are searching for a location
     * that can hold the memory space required.  If the image is
     * pre-linked, LOAD_ADDR will be non-zero, and the kernel should
     * honor that address if it happens to be free.
     *
     * In both cases, we will overwrite pages in this range with mappings
     * from the executable.
     */
    load_addr = target_mmap(load_addr, (size_t)hiaddr - loaddr + 1, PROT_NONE,
                            MAP_PRIVATE | MAP_ANON | MAP_NORESERVE |
                            (ehdr->e_type == ET_EXEC ? MAP_FIXED_NOREPLACE : 0),
                            -1, 0);
    if (load_addr == -1) {
        goto exit_mmap;
    }
    load_bias = load_addr - loaddr;

    if (elf_is_fdpic(ehdr)) {
        struct elf32_fdpic_loadseg *loadsegs = info->loadsegs =
            g_malloc(sizeof(*loadsegs) * info->nsegs);

        for (i = 0; i < ehdr->e_phnum; ++i) {
            switch (phdr[i].p_type) {
            case PT_DYNAMIC:
                info->pt_dynamic_addr = phdr[i].p_vaddr + load_bias;
                break;
            case PT_LOAD:
                loadsegs->addr = phdr[i].p_vaddr + load_bias;
                loadsegs->p_vaddr = phdr[i].p_vaddr;
                loadsegs->p_memsz = phdr[i].p_memsz;
                ++loadsegs;
                break;
            }
        }
    }

    info->load_bias = load_bias;
    info->code_offset = load_bias;
    info->data_offset = load_bias;
    info->load_addr = load_addr;
    info->entry = ehdr->e_entry + load_bias;
    info->start_code = -1;
    info->end_code = 0;
    info->start_data = -1;
    info->end_data = 0;
    /* Usual start for brk is after all sections of the main executable. */
    info->brk = TARGET_PAGE_ALIGN(hiaddr + load_bias);
    info->elf_flags = ehdr->e_flags;

    prot_exec = PROT_EXEC;
#ifdef TARGET_AARCH64
    /*
     * If the BTI feature is present, this indicates that the executable
     * pages of the startup binary should be mapped with PROT_BTI, so that
     * branch targets are enforced.
     *
     * The startup binary is either the interpreter or the static executable.
     * The interpreter is responsible for all pages of a dynamic executable.
     *
     * Elf notes are backward compatible to older cpus.
     * Do not enable BTI unless it is supported.
     */
    if ((info->note_flags & GNU_PROPERTY_AARCH64_FEATURE_1_BTI)
        && (pinterp_name == NULL || *pinterp_name == 0)
        && cpu_isar_feature(aa64_bti, ARM_CPU(thread_cpu))) {
        prot_exec |= TARGET_PROT_BTI;
    }
#endif

    for (i = 0; i < ehdr->e_phnum; i++) {
        struct elf_phdr *eppnt = phdr + i;
        if (eppnt->p_type == PT_LOAD) {
            abi_ulong vaddr, vaddr_po, vaddr_ps, vaddr_ef, vaddr_em;
            int elf_prot = 0;

            if (eppnt->p_flags & PF_R) {
                elf_prot |= PROT_READ;
            }
            if (eppnt->p_flags & PF_W) {
                elf_prot |= PROT_WRITE;
            }
            if (eppnt->p_flags & PF_X) {
                elf_prot |= prot_exec;
            }

            vaddr = load_bias + eppnt->p_vaddr;
            vaddr_po = vaddr & ~TARGET_PAGE_MASK;
            vaddr_ps = vaddr & TARGET_PAGE_MASK;

            vaddr_ef = vaddr + eppnt->p_filesz;
            vaddr_em = vaddr + eppnt->p_memsz;

            /*
             * Some segments may be completely empty, with a non-zero p_memsz
             * but no backing file segment.
             */
            if (eppnt->p_filesz != 0) {
                error = imgsrc_mmap(vaddr_ps, eppnt->p_filesz + vaddr_po,
                                    elf_prot, MAP_PRIVATE | MAP_FIXED,
                                    src, eppnt->p_offset - vaddr_po);
                if (error == -1) {
                    goto exit_mmap;
                }
            }

            /* If the load segment requests extra zeros (e.g. bss), map it. */
            if (vaddr_ef < vaddr_em &&
                !zero_bss(vaddr_ef, vaddr_em, elf_prot, &err)) {
                goto exit_errmsg;
            }

            /* Find the full program boundaries.  */
            if (elf_prot & PROT_EXEC) {
                if (vaddr < info->start_code) {
                    info->start_code = vaddr;
                }
                if (vaddr_ef > info->end_code) {
                    info->end_code = vaddr_ef;
                }
            }
            if (elf_prot & PROT_WRITE) {
                if (vaddr < info->start_data) {
                    info->start_data = vaddr;
                }
                if (vaddr_ef > info->end_data) {
                    info->end_data = vaddr_ef;
                }
            }
#ifdef TARGET_MIPS
        } else if (eppnt->p_type == PT_MIPS_ABIFLAGS) {
            Mips_elf_abiflags_v0 abiflags;

            if (!imgsrc_read(&abiflags, eppnt->p_offset, sizeof(abiflags),
                             src, &err)) {
                goto exit_errmsg;
            }
            bswap_mips_abiflags(&abiflags);
            info->fp_abi = abiflags.fp_abi;
#endif
        }
    }

    if (info->end_data == 0) {
        info->start_data = info->end_code;
        info->end_data = info->end_code;
    }

    if (qemu_log_enabled()) {
        load_symbols(ehdr, src, load_bias);
    }

    debuginfo_report_elf(image_name, src->fd, load_bias);

    mmap_unlock();

    close(src->fd);
    return;

 exit_mmap:
    error_setg_errno(&err, errno, "Error mapping file");
    goto exit_errmsg;
 exit_errmsg:
    error_reportf_err(err, "%s: ", image_name);
    exit(-1);
}

static void load_elf_interp(const char *filename, struct image_info *info,
                            char bprm_buf[BPRM_BUF_SIZE])
{
    struct elfhdr ehdr;
    ImageSource src;
    int fd, retval;
    Error *err = NULL;

    fd = open(path(filename), O_RDONLY);
    if (fd < 0) {
        error_setg_file_open(&err, errno, filename);
        error_report_err(err);
        exit(-1);
    }

    retval = read(fd, bprm_buf, BPRM_BUF_SIZE);
    if (retval < 0) {
        error_setg_errno(&err, errno, "Error reading file header");
        error_reportf_err(err, "%s: ", filename);
        exit(-1);
    }

    src.fd = fd;
    src.cache = bprm_buf;
    src.cache_size = retval;

    load_elf_image(filename, &src, info, &ehdr, NULL);
}

#ifdef VDSO_HEADER
#include VDSO_HEADER
#define  vdso_image_info()  &vdso_image_info
#else
#define  vdso_image_info()  NULL
#endif

static void load_elf_vdso(struct image_info *info, const VdsoImageInfo *vdso)
{
    ImageSource src;
    struct elfhdr ehdr;
    abi_ulong load_bias, load_addr;

    src.fd = -1;
    src.cache = vdso->image;
    src.cache_size = vdso->image_size;

    load_elf_image("<internal-vdso>", &src, info, &ehdr, NULL);
    load_addr = info->load_addr;
    load_bias = info->load_bias;

    /*
     * We need to relocate the VDSO image.  The one built into the kernel
     * is built for a fixed address.  The one built for QEMU is not, since
     * that requires close control of the guest address space.
     * We pre-processed the image to locate all of the addresses that need
     * to be updated.
     */
    for (unsigned i = 0, n = vdso->reloc_count; i < n; i++) {
        abi_ulong *addr = g2h_untagged(load_addr + vdso->relocs[i]);
        *addr = tswapal(tswapal(*addr) + load_bias);
    }

    /* Install signal trampolines, if present. */
    if (vdso->sigreturn_ofs) {
        default_sigreturn = load_addr + vdso->sigreturn_ofs;
    }
    if (vdso->rt_sigreturn_ofs) {
        default_rt_sigreturn = load_addr + vdso->rt_sigreturn_ofs;
    }

    /* Remove write from VDSO segment. */
    target_mprotect(info->start_data, info->end_data - info->start_data,
                    PROT_READ | PROT_EXEC);
}

static int symfind(const void *s0, const void *s1)
{
    struct elf_sym *sym = (struct elf_sym *)s1;
    __typeof(sym->st_value) addr = *(uint64_t *)s0;
    int result = 0;

    if (addr < sym->st_value) {
        result = -1;
    } else if (addr >= sym->st_value + sym->st_size) {
        result = 1;
    }
    return result;
}

static const char *lookup_symbolxx(struct syminfo *s, uint64_t orig_addr)
{
#if ELF_CLASS == ELFCLASS32
    struct elf_sym *syms = s->disas_symtab.elf32;
#else
    struct elf_sym *syms = s->disas_symtab.elf64;
#endif

    // binary search
    struct elf_sym *sym;

    sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms), symfind);
    if (sym != NULL) {
        return s->disas_strtab + sym->st_name;
    }

    return "";
}

/* FIXME: This should use elf_ops.h  */
static int symcmp(const void *s0, const void *s1)
{
    struct elf_sym *sym0 = (struct elf_sym *)s0;
    struct elf_sym *sym1 = (struct elf_sym *)s1;
    return (sym0->st_value < sym1->st_value)
        ? -1
        : ((sym0->st_value > sym1->st_value) ? 1 : 0);
}

/* Best attempt to load symbols from this ELF object. */
static void load_symbols(struct elfhdr *hdr, const ImageSource *src,
                         abi_ulong load_bias)
{
    int i, shnum, nsyms, sym_idx = 0, str_idx = 0;
    g_autofree struct elf_shdr *shdr = NULL;
    char *strings = NULL;
    struct elf_sym *syms = NULL;
    struct elf_sym *new_syms;
    uint64_t segsz;

    shnum = hdr->e_shnum;
    shdr = imgsrc_read_alloc(hdr->e_shoff, shnum * sizeof(struct elf_shdr),
                             src, NULL);
    if (shdr == NULL) {
        return;
    }

    bswap_shdr(shdr, shnum);
    for (i = 0; i < shnum; ++i) {
        if (shdr[i].sh_type == SHT_SYMTAB) {
            sym_idx = i;
            str_idx = shdr[i].sh_link;
            goto found;
        }
    }

    /* There will be no symbol table if the file was stripped.  */
    return;

 found:
    /* Now know where the strtab and symtab are.  Snarf them.  */

    segsz = shdr[str_idx].sh_size;
    strings = g_try_malloc(segsz);
    if (!strings) {
        goto give_up;
    }
    if (!imgsrc_read(strings, shdr[str_idx].sh_offset, segsz, src, NULL)) {
        goto give_up;
    }

    segsz = shdr[sym_idx].sh_size;
    if (segsz / sizeof(struct elf_sym) > INT_MAX) {
        /*
         * Implausibly large symbol table: give up rather than ploughing
         * on with the number of symbols calculation overflowing.
         */
        goto give_up;
    }
    nsyms = segsz / sizeof(struct elf_sym);
    syms = g_try_malloc(segsz);
    if (!syms) {
        goto give_up;
    }
    if (!imgsrc_read(syms, shdr[sym_idx].sh_offset, segsz, src, NULL)) {
        goto give_up;
    }

    for (i = 0; i < nsyms; ) {
        bswap_sym(syms + i);
        /* Throw away entries which we do not need.  */
        if (syms[i].st_shndx == SHN_UNDEF
            || syms[i].st_shndx >= SHN_LORESERVE
            || ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
            if (i < --nsyms) {
                syms[i] = syms[nsyms];
            }
        } else {
#if defined(TARGET_ARM) || defined (TARGET_MIPS)
            /* The bottom address bit marks a Thumb or MIPS16 symbol.  */
            syms[i].st_value &= ~(target_ulong)1;
#endif
            syms[i].st_value += load_bias;
            i++;
        }
    }

    /* No "useful" symbol.  */
    if (nsyms == 0) {
        goto give_up;
    }

    /*
     * Attempt to free the storage associated with the local symbols
     * that we threw away.  Whether or not this has any effect on the
     * memory allocation depends on the malloc implementation and how
     * many symbols we managed to discard.
     */
    new_syms = g_try_renew(struct elf_sym, syms, nsyms);
    if (new_syms == NULL) {
        goto give_up;
    }
    syms = new_syms;

    qsort(syms, nsyms, sizeof(*syms), symcmp);

    {
        struct syminfo *s = g_new(struct syminfo, 1);

        s->disas_strtab = strings;
        s->disas_num_syms = nsyms;
#if ELF_CLASS == ELFCLASS32
        s->disas_symtab.elf32 = syms;
#else
        s->disas_symtab.elf64 = syms;
#endif
        s->lookup_symbol = lookup_symbolxx;
        s->next = syminfos;
        syminfos = s;
    }
    return;

 give_up:
    g_free(strings);
    g_free(syms);
}

uint32_t get_elf_eflags(int fd)
{
    struct elfhdr ehdr;
    off_t offset;
    int ret;

    /* Read ELF header */
    offset = lseek(fd, 0, SEEK_SET);
    if (offset == (off_t) -1) {
        return 0;
    }
    ret = read(fd, &ehdr, sizeof(ehdr));
    if (ret < sizeof(ehdr)) {
        return 0;
    }
    offset = lseek(fd, offset, SEEK_SET);
    if (offset == (off_t) -1) {
        return 0;
    }

    /* Check ELF signature */
    if (!elf_check_ident(&ehdr)) {
        return 0;
    }

    /* check header */
    bswap_ehdr(&ehdr);
    if (!elf_check_ehdr(&ehdr)) {
        return 0;
    }

    /* return architecture id */
    return ehdr.e_flags;
}

int load_elf_binary(struct linux_binprm *bprm, struct image_info *info)
{
    /*
     * We need a copy of the elf header for passing to create_elf_tables.
     * We will have overwritten the original when we re-use bprm->buf
     * while loading the interpreter.  Allocate the storage for this now
     * and let elf_load_image do any swapping that may be required.
     */
    struct elfhdr ehdr;
    struct image_info interp_info, vdso_info;
    char *elf_interpreter = NULL;
    char *scratch;

    memset(&interp_info, 0, sizeof(interp_info));
#ifdef TARGET_MIPS
    interp_info.fp_abi = MIPS_ABI_FP_UNKNOWN;
#endif

    load_elf_image(bprm->filename, &bprm->src, info, &ehdr, &elf_interpreter);

    /* Do this so that we can load the interpreter, if need be.  We will
       change some of these later */
    bprm->p = setup_arg_pages(bprm, info);

    scratch = g_new0(char, TARGET_PAGE_SIZE);
    if (STACK_GROWS_DOWN) {
        bprm->p = copy_elf_strings(1, &bprm->filename, scratch,
                                   bprm->p, info->stack_limit);
        info->file_string = bprm->p;
        bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch,
                                   bprm->p, info->stack_limit);
        info->env_strings = bprm->p;
        bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch,
                                   bprm->p, info->stack_limit);
        info->arg_strings = bprm->p;
    } else {
        info->arg_strings = bprm->p;
        bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch,
                                   bprm->p, info->stack_limit);
        info->env_strings = bprm->p;
        bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch,
                                   bprm->p, info->stack_limit);
        info->file_string = bprm->p;
        bprm->p = copy_elf_strings(1, &bprm->filename, scratch,
                                   bprm->p, info->stack_limit);
    }

    g_free(scratch);

    if (!bprm->p) {
        fprintf(stderr, "%s: %s\n", bprm->filename, strerror(E2BIG));
        exit(-1);
    }

    if (elf_interpreter) {
        load_elf_interp(elf_interpreter, &interp_info, bprm->buf);

        /*
         * While unusual because of ELF_ET_DYN_BASE, if we are unlucky
         * with the mappings the interpreter can be loaded above but
         * near the main executable, which can leave very little room
         * for the heap.
         * If the current brk has less than 16MB, use the end of the
         * interpreter.
         */
        if (interp_info.brk > info->brk &&
            interp_info.load_bias - info->brk < 16 * MiB)  {
            info->brk = interp_info.brk;
        }

        /* If the program interpreter is one of these two, then assume
           an iBCS2 image.  Otherwise assume a native linux image.  */

        if (strcmp(elf_interpreter, "/usr/lib/libc.so.1") == 0
            || strcmp(elf_interpreter, "/usr/lib/ld.so.1") == 0) {
            info->personality = PER_SVR4;

            /* Why this, you ask???  Well SVr4 maps page 0 as read-only,
               and some applications "depend" upon this behavior.  Since
               we do not have the power to recompile these, we emulate
               the SVr4 behavior.  Sigh.  */
            target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
                        MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
        }
#ifdef TARGET_MIPS
        info->interp_fp_abi = interp_info.fp_abi;
#endif
    }

    /*
     * Load a vdso if available, which will amongst other things contain the
     * signal trampolines.  Otherwise, allocate a separate page for them.
     */
    const VdsoImageInfo *vdso = vdso_image_info();
    if (vdso) {
        load_elf_vdso(&vdso_info, vdso);
    } else if (TARGET_ARCH_HAS_SIGTRAMP_PAGE) {
        abi_long tramp_page = target_mmap(0, TARGET_PAGE_SIZE,
                                          PROT_READ | PROT_WRITE,
                                          MAP_PRIVATE | MAP_ANON, -1, 0);
        if (tramp_page == -1) {
            return -errno;
        }

        setup_sigtramp(tramp_page);
        target_mprotect(tramp_page, TARGET_PAGE_SIZE, PROT_READ | PROT_EXEC);
    }

    bprm->p = create_elf_tables(bprm->p, bprm->argc, bprm->envc, &ehdr, info,
                                elf_interpreter ? &interp_info : NULL,
                                vdso ? &vdso_info : NULL);
    info->start_stack = bprm->p;

    /* If we have an interpreter, set that as the program's entry point.
       Copy the load_bias as well, to help PPC64 interpret the entry
       point as a function descriptor.  Do this after creating elf tables
       so that we copy the original program entry point into the AUXV.  */
    if (elf_interpreter) {
        info->load_bias = interp_info.load_bias;
        info->entry = interp_info.entry;
        g_free(elf_interpreter);
    }

#ifdef USE_ELF_CORE_DUMP
    bprm->core_dump = &elf_core_dump;
#endif

    return 0;
}

#ifdef USE_ELF_CORE_DUMP
/*
 * Definitions to generate Intel SVR4-like core files.
 * These mostly have the same names as the SVR4 types with "target_elf_"
 * tacked on the front to prevent clashes with linux definitions,
 * and the typedef forms have been avoided.  This is mostly like
 * the SVR4 structure, but more Linuxy, with things that Linux does
 * not support and which gdb doesn't really use excluded.
 *
 * Fields we don't dump (their contents is zero) in linux-user qemu
 * are marked with XXX.
 *
 * Core dump code is copied from linux kernel (fs/binfmt_elf.c).
 *
 * Porting ELF coredump for target is (quite) simple process.  First you
 * define USE_ELF_CORE_DUMP in target ELF code (where init_thread() for
 * the target resides):
 *
 * #define USE_ELF_CORE_DUMP
 *
 * Next you define type of register set used for dumping.  ELF specification
 * says that it needs to be array of elf_greg_t that has size of ELF_NREG.
 *
 * typedef <target_regtype> target_elf_greg_t;
 * #define ELF_NREG <number of registers>
 * typedef taret_elf_greg_t target_elf_gregset_t[ELF_NREG];
 *
 * Last step is to implement target specific function that copies registers
 * from given cpu into just specified register set.  Prototype is:
 *
 * static void elf_core_copy_regs(taret_elf_gregset_t *regs,
 *                                const CPUArchState *env);
 *
 * Parameters:
 *     regs - copy register values into here (allocated and zeroed by caller)
 *     env - copy registers from here
 *
 * Example for ARM target is provided in this file.
 */

/* An ELF note in memory */
struct memelfnote {
    const char *name;
    size_t     namesz;
    size_t     namesz_rounded;
    int        type;
    size_t     datasz;
    size_t     datasz_rounded;
    void       *data;
    size_t     notesz;
};

struct target_elf_siginfo {
    abi_int    si_signo; /* signal number */
    abi_int    si_code;  /* extra code */
    abi_int    si_errno; /* errno */
};

struct target_elf_prstatus {
    struct target_elf_siginfo pr_info;      /* Info associated with signal */
    abi_short          pr_cursig;    /* Current signal */
    abi_ulong          pr_sigpend;   /* XXX */
    abi_ulong          pr_sighold;   /* XXX */
    target_pid_t       pr_pid;
    target_pid_t       pr_ppid;
    target_pid_t       pr_pgrp;
    target_pid_t       pr_sid;
    struct target_timeval pr_utime;  /* XXX User time */
    struct target_timeval pr_stime;  /* XXX System time */
    struct target_timeval pr_cutime; /* XXX Cumulative user time */
    struct target_timeval pr_cstime; /* XXX Cumulative system time */
    target_elf_gregset_t      pr_reg;       /* GP registers */
    abi_int            pr_fpvalid;   /* XXX */
};

#define ELF_PRARGSZ     (80) /* Number of chars for args */

struct target_elf_prpsinfo {
    char         pr_state;       /* numeric process state */
    char         pr_sname;       /* char for pr_state */
    char         pr_zomb;        /* zombie */
    char         pr_nice;        /* nice val */
    abi_ulong    pr_flag;        /* flags */
    target_uid_t pr_uid;
    target_gid_t pr_gid;
    target_pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
    /* Lots missing */
    char    pr_fname[16] QEMU_NONSTRING; /* filename of executable */
    char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
};

/* Here is the structure in which status of each thread is captured. */
struct elf_thread_status {
    QTAILQ_ENTRY(elf_thread_status)  ets_link;
    struct target_elf_prstatus prstatus;   /* NT_PRSTATUS */
#if 0
    elf_fpregset_t fpu;             /* NT_PRFPREG */
    struct task_struct *thread;
    elf_fpxregset_t xfpu;           /* ELF_CORE_XFPREG_TYPE */
#endif
    struct memelfnote notes[1];
    int num_notes;
};

struct elf_note_info {
    struct memelfnote   *notes;
    struct target_elf_prstatus *prstatus;  /* NT_PRSTATUS */
    struct target_elf_prpsinfo *psinfo;    /* NT_PRPSINFO */

    QTAILQ_HEAD(, elf_thread_status) thread_list;
#if 0
    /*
     * Current version of ELF coredump doesn't support
     * dumping fp regs etc.
     */
    elf_fpregset_t *fpu;
    elf_fpxregset_t *xfpu;
    int thread_status_size;
#endif
    int notes_size;
    int numnote;
};

struct vm_area_struct {
    target_ulong   vma_start;  /* start vaddr of memory region */
    target_ulong   vma_end;    /* end vaddr of memory region */
    abi_ulong      vma_flags;  /* protection etc. flags for the region */
    QTAILQ_ENTRY(vm_area_struct) vma_link;
};

struct mm_struct {
    QTAILQ_HEAD(, vm_area_struct) mm_mmap;
    int mm_count;           /* number of mappings */
};

static struct mm_struct *vma_init(void);
static void vma_delete(struct mm_struct *);
static int vma_add_mapping(struct mm_struct *, target_ulong,
                           target_ulong, abi_ulong);
static int vma_get_mapping_count(const struct mm_struct *);
static struct vm_area_struct *vma_first(const struct mm_struct *);
static struct vm_area_struct *vma_next(struct vm_area_struct *);
static abi_ulong vma_dump_size(const struct vm_area_struct *);
static int vma_walker(void *priv, target_ulong start, target_ulong end,
                      unsigned long flags);

static void fill_elf_header(struct elfhdr *, int, uint16_t, uint32_t);
static void fill_note(struct memelfnote *, const char *, int,
                      unsigned int, void *);
static void fill_prstatus(struct target_elf_prstatus *, const TaskState *, int);
static int fill_psinfo(struct target_elf_prpsinfo *, const TaskState *);
static void fill_auxv_note(struct memelfnote *, const TaskState *);
static void fill_elf_note_phdr(struct elf_phdr *, int, off_t);
static size_t note_size(const struct memelfnote *);
static void free_note_info(struct elf_note_info *);
static int fill_note_info(struct elf_note_info *, long, const CPUArchState *);
static void fill_thread_info(struct elf_note_info *, const CPUArchState *);

static int dump_write(int, const void *, size_t);
static int write_note(struct memelfnote *, int);
static int write_note_info(struct elf_note_info *, int);

#ifdef BSWAP_NEEDED
static void bswap_prstatus(struct target_elf_prstatus *prstatus)
{
    prstatus->pr_info.si_signo = tswap32(prstatus->pr_info.si_signo);
    prstatus->pr_info.si_code = tswap32(prstatus->pr_info.si_code);
    prstatus->pr_info.si_errno = tswap32(prstatus->pr_info.si_errno);
    prstatus->pr_cursig = tswap16(prstatus->pr_cursig);
    prstatus->pr_sigpend = tswapal(prstatus->pr_sigpend);
    prstatus->pr_sighold = tswapal(prstatus->pr_sighold);
    prstatus->pr_pid = tswap32(prstatus->pr_pid);
    prstatus->pr_ppid = tswap32(prstatus->pr_ppid);
    prstatus->pr_pgrp = tswap32(prstatus->pr_pgrp);
    prstatus->pr_sid = tswap32(prstatus->pr_sid);
    /* cpu times are not filled, so we skip them */
    /* regs should be in correct format already */
    prstatus->pr_fpvalid = tswap32(prstatus->pr_fpvalid);
}

static void bswap_psinfo(struct target_elf_prpsinfo *psinfo)
{
    psinfo->pr_flag = tswapal(psinfo->pr_flag);
    psinfo->pr_uid = tswap16(psinfo->pr_uid);
    psinfo->pr_gid = tswap16(psinfo->pr_gid);
    psinfo->pr_pid = tswap32(psinfo->pr_pid);
    psinfo->pr_ppid = tswap32(psinfo->pr_ppid);
    psinfo->pr_pgrp = tswap32(psinfo->pr_pgrp);
    psinfo->pr_sid = tswap32(psinfo->pr_sid);
}

static void bswap_note(struct elf_note *en)
{
    bswap32s(&en->n_namesz);
    bswap32s(&en->n_descsz);
    bswap32s(&en->n_type);
}
#else
static inline void bswap_prstatus(struct target_elf_prstatus *p) { }
static inline void bswap_psinfo(struct target_elf_prpsinfo *p) {}
static inline void bswap_note(struct elf_note *en) { }
#endif /* BSWAP_NEEDED */

/*
 * Minimal support for linux memory regions.  These are needed
 * when we are finding out what memory exactly belongs to
 * emulated process.  No locks needed here, as long as
 * thread that received the signal is stopped.
 */

static struct mm_struct *vma_init(void)
{
    struct mm_struct *mm;

    if ((mm = g_malloc(sizeof (*mm))) == NULL)
        return (NULL);

    mm->mm_count = 0;
    QTAILQ_INIT(&mm->mm_mmap);

    return (mm);
}

static void vma_delete(struct mm_struct *mm)
{
    struct vm_area_struct *vma;

    while ((vma = vma_first(mm)) != NULL) {
        QTAILQ_REMOVE(&mm->mm_mmap, vma, vma_link);
        g_free(vma);
    }
    g_free(mm);
}

static int vma_add_mapping(struct mm_struct *mm, target_ulong start,
                           target_ulong end, abi_ulong flags)
{
    struct vm_area_struct *vma;

    if ((vma = g_malloc0(sizeof (*vma))) == NULL)
        return (-1);

    vma->vma_start = start;
    vma->vma_end = end;
    vma->vma_flags = flags;

    QTAILQ_INSERT_TAIL(&mm->mm_mmap, vma, vma_link);
    mm->mm_count++;

    return (0);
}

static struct vm_area_struct *vma_first(const struct mm_struct *mm)
{
    return (QTAILQ_FIRST(&mm->mm_mmap));
}

static struct vm_area_struct *vma_next(struct vm_area_struct *vma)
{
    return (QTAILQ_NEXT(vma, vma_link));
}

static int vma_get_mapping_count(const struct mm_struct *mm)
{
    return (mm->mm_count);
}

/*
 * Calculate file (dump) size of given memory region.
 */
static abi_ulong vma_dump_size(const struct vm_area_struct *vma)
{
    /* if we cannot even read the first page, skip it */
    if (!access_ok_untagged(VERIFY_READ, vma->vma_start, TARGET_PAGE_SIZE))
        return (0);

    /*
     * Usually we don't dump executable pages as they contain
     * non-writable code that debugger can read directly from
     * target library etc.  However, thread stacks are marked
     * also executable so we read in first page of given region
     * and check whether it contains elf header.  If there is
     * no elf header, we dump it.
     */
    if (vma->vma_flags & PROT_EXEC) {
        char page[TARGET_PAGE_SIZE];

        if (copy_from_user(page, vma->vma_start, sizeof (page))) {
            return 0;
        }
        if ((page[EI_MAG0] == ELFMAG0) &&
            (page[EI_MAG1] == ELFMAG1) &&
            (page[EI_MAG2] == ELFMAG2) &&
            (page[EI_MAG3] == ELFMAG3)) {
            /*
             * Mappings are possibly from ELF binary.  Don't dump
             * them.
             */
            return (0);
        }
    }

    return (vma->vma_end - vma->vma_start);
}

static int vma_walker(void *priv, target_ulong start, target_ulong end,
                      unsigned long flags)
{
    struct mm_struct *mm = (struct mm_struct *)priv;

    vma_add_mapping(mm, start, end, flags);
    return (0);
}

static void fill_note(struct memelfnote *note, const char *name, int type,
                      unsigned int sz, void *data)
{
    unsigned int namesz;

    namesz = strlen(name) + 1;
    note->name = name;
    note->namesz = namesz;
    note->namesz_rounded = roundup(namesz, sizeof (int32_t));
    note->type = type;
    note->datasz = sz;
    note->datasz_rounded = roundup(sz, sizeof (int32_t));

    note->data = data;

    /*
     * We calculate rounded up note size here as specified by
     * ELF document.
     */
    note->notesz = sizeof (struct elf_note) +
        note->namesz_rounded + note->datasz_rounded;
}

static void fill_elf_header(struct elfhdr *elf, int segs, uint16_t machine,
                            uint32_t flags)
{
    (void) memset(elf, 0, sizeof(*elf));

    (void) memcpy(elf->e_ident, ELFMAG, SELFMAG);
    elf->e_ident[EI_CLASS] = ELF_CLASS;
    elf->e_ident[EI_DATA] = ELF_DATA;
    elf->e_ident[EI_VERSION] = EV_CURRENT;
    elf->e_ident[EI_OSABI] = ELF_OSABI;

    elf->e_type = ET_CORE;
    elf->e_machine = machine;
    elf->e_version = EV_CURRENT;
    elf->e_phoff = sizeof(struct elfhdr);
    elf->e_flags = flags;
    elf->e_ehsize = sizeof(struct elfhdr);
    elf->e_phentsize = sizeof(struct elf_phdr);
    elf->e_phnum = segs;

    bswap_ehdr(elf);
}

static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, off_t offset)
{
    phdr->p_type = PT_NOTE;
    phdr->p_offset = offset;
    phdr->p_vaddr = 0;
    phdr->p_paddr = 0;
    phdr->p_filesz = sz;
    phdr->p_memsz = 0;
    phdr->p_flags = 0;
    phdr->p_align = 0;

    bswap_phdr(phdr, 1);
}

static size_t note_size(const struct memelfnote *note)
{
    return (note->notesz);
}

static void fill_prstatus(struct target_elf_prstatus *prstatus,
                          const TaskState *ts, int signr)
{
    (void) memset(prstatus, 0, sizeof (*prstatus));
    prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
    prstatus->pr_pid = ts->ts_tid;
    prstatus->pr_ppid = getppid();
    prstatus->pr_pgrp = getpgrp();
    prstatus->pr_sid = getsid(0);

    bswap_prstatus(prstatus);
}

static int fill_psinfo(struct target_elf_prpsinfo *psinfo, const TaskState *ts)
{
    char *base_filename;
    unsigned int i, len;

    (void) memset(psinfo, 0, sizeof (*psinfo));

    len = ts->info->env_strings - ts->info->arg_strings;
    if (len >= ELF_PRARGSZ)
        len = ELF_PRARGSZ - 1;
    if (copy_from_user(&psinfo->pr_psargs, ts->info->arg_strings, len)) {
        return -EFAULT;
    }
    for (i = 0; i < len; i++)
        if (psinfo->pr_psargs[i] == 0)
            psinfo->pr_psargs[i] = ' ';
    psinfo->pr_psargs[len] = 0;

    psinfo->pr_pid = getpid();
    psinfo->pr_ppid = getppid();
    psinfo->pr_pgrp = getpgrp();
    psinfo->pr_sid = getsid(0);
    psinfo->pr_uid = getuid();
    psinfo->pr_gid = getgid();

    base_filename = g_path_get_basename(ts->bprm->filename);
    /*
     * Using strncpy here is fine: at max-length,
     * this field is not NUL-terminated.
     */
    (void) strncpy(psinfo->pr_fname, base_filename,
                   sizeof(psinfo->pr_fname));

    g_free(base_filename);
    bswap_psinfo(psinfo);
    return (0);
}

static void fill_auxv_note(struct memelfnote *note, const TaskState *ts)
{
    elf_addr_t auxv = (elf_addr_t)ts->info->saved_auxv;
    elf_addr_t orig_auxv = auxv;
    void *ptr;
    int len = ts->info->auxv_len;

    /*
     * Auxiliary vector is stored in target process stack.  It contains
     * {type, value} pairs that we need to dump into note.  This is not
     * strictly necessary but we do it here for sake of completeness.
     */

    /* read in whole auxv vector and copy it to memelfnote */
    ptr = lock_user(VERIFY_READ, orig_auxv, len, 0);
    if (ptr != NULL) {
        fill_note(note, "CORE", NT_AUXV, len, ptr);
        unlock_user(ptr, auxv, len);
    }
}

/*
 * Constructs name of coredump file.  We have following convention
 * for the name:
 *     qemu_<basename-of-target-binary>_<date>-<time>_<pid>.core
 *
 * Returns the filename
 */
static char *core_dump_filename(const TaskState *ts)
{
    g_autoptr(GDateTime) now = g_date_time_new_now_local();
    g_autofree char *nowstr = g_date_time_format(now, "%Y%m%d-%H%M%S");
    g_autofree char *base_filename = g_path_get_basename(ts->bprm->filename);

    return g_strdup_printf("qemu_%s_%s_%d.core",
                           base_filename, nowstr, (int)getpid());
}

static int dump_write(int fd, const void *ptr, size_t size)
{
    const char *bufp = (const char *)ptr;
    ssize_t bytes_written, bytes_left;
    struct rlimit dumpsize;
    off_t pos;

    bytes_written = 0;
    getrlimit(RLIMIT_CORE, &dumpsize);
    if ((pos = lseek(fd, 0, SEEK_CUR))==-1) {
        if (errno == ESPIPE) { /* not a seekable stream */
            bytes_left = size;
        } else {
            return pos;
        }
    } else {
        if (dumpsize.rlim_cur <= pos) {
            return -1;
        } else if (dumpsize.rlim_cur == RLIM_INFINITY) {
            bytes_left = size;
        } else {
            size_t limit_left=dumpsize.rlim_cur - pos;
            bytes_left = limit_left >= size ? size : limit_left ;
        }
    }

    /*
     * In normal conditions, single write(2) should do but
     * in case of socket etc. this mechanism is more portable.
     */
    do {
        bytes_written = write(fd, bufp, bytes_left);
        if (bytes_written < 0) {
            if (errno == EINTR)
                continue;
            return (-1);
        } else if (bytes_written == 0) { /* eof */
            return (-1);
        }
        bufp += bytes_written;
        bytes_left -= bytes_written;
    } while (bytes_left > 0);

    return (0);
}

static int write_note(struct memelfnote *men, int fd)
{
    struct elf_note en;

    en.n_namesz = men->namesz;
    en.n_type = men->type;
    en.n_descsz = men->datasz;

    bswap_note(&en);

    if (dump_write(fd, &en, sizeof(en)) != 0)
        return (-1);
    if (dump_write(fd, men->name, men->namesz_rounded) != 0)
        return (-1);
    if (dump_write(fd, men->data, men->datasz_rounded) != 0)
        return (-1);

    return (0);
}

static void fill_thread_info(struct elf_note_info *info, const CPUArchState *env)
{
    CPUState *cpu = env_cpu((CPUArchState *)env);
    TaskState *ts = (TaskState *)cpu->opaque;
    struct elf_thread_status *ets;

    ets = g_malloc0(sizeof (*ets));
    ets->num_notes = 1; /* only prstatus is dumped */
    fill_prstatus(&ets->prstatus, ts, 0);
    elf_core_copy_regs(&ets->prstatus.pr_reg, env);
    fill_note(&ets->notes[0], "CORE", NT_PRSTATUS, sizeof (ets->prstatus),
              &ets->prstatus);

    QTAILQ_INSERT_TAIL(&info->thread_list, ets, ets_link);

    info->notes_size += note_size(&ets->notes[0]);
}

static void init_note_info(struct elf_note_info *info)
{
    /* Initialize the elf_note_info structure so that it is at
     * least safe to call free_note_info() on it. Must be
     * called before calling fill_note_info().
     */
    memset(info, 0, sizeof (*info));
    QTAILQ_INIT(&info->thread_list);
}

static int fill_note_info(struct elf_note_info *info,
                          long signr, const CPUArchState *env)
{
#define NUMNOTES 3
    CPUState *cpu = env_cpu((CPUArchState *)env);
    TaskState *ts = (TaskState *)cpu->opaque;
    int i;

    info->notes = g_new0(struct memelfnote, NUMNOTES);
    if (info->notes == NULL)
        return (-ENOMEM);
    info->prstatus = g_malloc0(sizeof (*info->prstatus));
    if (info->prstatus == NULL)
        return (-ENOMEM);
    info->psinfo = g_malloc0(sizeof (*info->psinfo));
    if (info->prstatus == NULL)
        return (-ENOMEM);

    /*
     * First fill in status (and registers) of current thread
     * including process info & aux vector.
     */
    fill_prstatus(info->prstatus, ts, signr);
    elf_core_copy_regs(&info->prstatus->pr_reg, env);
    fill_note(&info->notes[0], "CORE", NT_PRSTATUS,
              sizeof (*info->prstatus), info->prstatus);
    fill_psinfo(info->psinfo, ts);
    fill_note(&info->notes[1], "CORE", NT_PRPSINFO,
              sizeof (*info->psinfo), info->psinfo);
    fill_auxv_note(&info->notes[2], ts);
    info->numnote = 3;

    info->notes_size = 0;
    for (i = 0; i < info->numnote; i++)
        info->notes_size += note_size(&info->notes[i]);

    /* read and fill status of all threads */
    WITH_QEMU_LOCK_GUARD(&qemu_cpu_list_lock) {
        CPU_FOREACH(cpu) {
            if (cpu == thread_cpu) {
                continue;
            }
            fill_thread_info(info, cpu_env(cpu));
        }
    }

    return (0);
}

static void free_note_info(struct elf_note_info *info)
{
    struct elf_thread_status *ets;

    while (!QTAILQ_EMPTY(&info->thread_list)) {
        ets = QTAILQ_FIRST(&info->thread_list);
        QTAILQ_REMOVE(&info->thread_list, ets, ets_link);
        g_free(ets);
    }

    g_free(info->prstatus);
    g_free(info->psinfo);
    g_free(info->notes);
}

static int write_note_info(struct elf_note_info *info, int fd)
{
    struct elf_thread_status *ets;
    int i, error = 0;

    /* write prstatus, psinfo and auxv for current thread */
    for (i = 0; i < info->numnote; i++)
        if ((error = write_note(&info->notes[i], fd)) != 0)
            return (error);

    /* write prstatus for each thread */
    QTAILQ_FOREACH(ets, &info->thread_list, ets_link) {
        if ((error = write_note(&ets->notes[0], fd)) != 0)
            return (error);
    }

    return (0);
}

/*
 * Write out ELF coredump.
 *
 * See documentation of ELF object file format in:
 * http://www.caldera.com/developers/devspecs/gabi41.pdf
 *
 * Coredump format in linux is following:
 *
 * 0   +----------------------+         \
 *     | ELF header           | ET_CORE  |
 *     +----------------------+          |
 *     | ELF program headers  |          |--- headers
 *     | - NOTE section       |          |
 *     | - PT_LOAD sections   |          |
 *     +----------------------+         /
 *     | NOTEs:               |
 *     | - NT_PRSTATUS        |
 *     | - NT_PRSINFO         |
 *     | - NT_AUXV            |
 *     +----------------------+ <-- aligned to target page
 *     | Process memory dump  |
 *     :                      :
 *     .                      .
 *     :                      :
 *     |                      |
 *     +----------------------+
 *
 * NT_PRSTATUS -> struct elf_prstatus (per thread)
 * NT_PRSINFO  -> struct elf_prpsinfo
 * NT_AUXV is array of { type, value } pairs (see fill_auxv_note()).
 *
 * Format follows System V format as close as possible.  Current
 * version limitations are as follows:
 *     - no floating point registers are dumped
 *
 * Function returns 0 in case of success, negative errno otherwise.
 *
 * TODO: make this work also during runtime: it should be
 * possible to force coredump from running process and then
 * continue processing.  For example qemu could set up SIGUSR2
 * handler (provided that target process haven't registered
 * handler for that) that does the dump when signal is received.
 */
static int elf_core_dump(int signr, const CPUArchState *env)
{
    const CPUState *cpu = env_cpu((CPUArchState *)env);
    const TaskState *ts = (const TaskState *)cpu->opaque;
    struct vm_area_struct *vma = NULL;
    g_autofree char *corefile = NULL;
    struct elf_note_info info;
    struct elfhdr elf;
    struct elf_phdr phdr;
    struct rlimit dumpsize;
    struct mm_struct *mm = NULL;
    off_t offset = 0, data_offset = 0;
    int segs = 0;
    int fd = -1;

    init_note_info(&info);

    errno = 0;
    getrlimit(RLIMIT_CORE, &dumpsize);
    if (dumpsize.rlim_cur == 0)
        return 0;

    corefile = core_dump_filename(ts);

    if ((fd = open(corefile, O_WRONLY | O_CREAT,
                   S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) < 0)
        return (-errno);

    /*
     * Walk through target process memory mappings and
     * set up structure containing this information.  After
     * this point vma_xxx functions can be used.
     */
    if ((mm = vma_init()) == NULL)
        goto out;

    walk_memory_regions(mm, vma_walker);
    segs = vma_get_mapping_count(mm);

    /*
     * Construct valid coredump ELF header.  We also
     * add one more segment for notes.
     */
    fill_elf_header(&elf, segs + 1, ELF_MACHINE, 0);
    if (dump_write(fd, &elf, sizeof (elf)) != 0)
        goto out;

    /* fill in the in-memory version of notes */
    if (fill_note_info(&info, signr, env) < 0)
        goto out;

    offset += sizeof (elf);                             /* elf header */
    offset += (segs + 1) * sizeof (struct elf_phdr);    /* program headers */

    /* write out notes program header */
    fill_elf_note_phdr(&phdr, info.notes_size, offset);

    offset += info.notes_size;
    if (dump_write(fd, &phdr, sizeof (phdr)) != 0)
        goto out;

    /*
     * ELF specification wants data to start at page boundary so
     * we align it here.
     */
    data_offset = offset = roundup(offset, ELF_EXEC_PAGESIZE);

    /*
     * Write program headers for memory regions mapped in
     * the target process.
     */
    for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) {
        (void) memset(&phdr, 0, sizeof (phdr));

        phdr.p_type = PT_LOAD;
        phdr.p_offset = offset;
        phdr.p_vaddr = vma->vma_start;
        phdr.p_paddr = 0;
        phdr.p_filesz = vma_dump_size(vma);
        offset += phdr.p_filesz;
        phdr.p_memsz = vma->vma_end - vma->vma_start;
        phdr.p_flags = vma->vma_flags & PROT_READ ? PF_R : 0;
        if (vma->vma_flags & PROT_WRITE)
            phdr.p_flags |= PF_W;
        if (vma->vma_flags & PROT_EXEC)
            phdr.p_flags |= PF_X;
        phdr.p_align = ELF_EXEC_PAGESIZE;

        bswap_phdr(&phdr, 1);
        if (dump_write(fd, &phdr, sizeof(phdr)) != 0) {
            goto out;
        }
    }

    /*
     * Next we write notes just after program headers.  No
     * alignment needed here.
     */
    if (write_note_info(&info, fd) < 0)
        goto out;

    /* align data to page boundary */
    if (lseek(fd, data_offset, SEEK_SET) != data_offset)
        goto out;

    /*
     * Finally we can dump process memory into corefile as well.
     */
    for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) {
        abi_ulong addr;
        abi_ulong end;

        end = vma->vma_start + vma_dump_size(vma);

        for (addr = vma->vma_start; addr < end;
             addr += TARGET_PAGE_SIZE) {
            char page[TARGET_PAGE_SIZE];
            int error;

            /*
             *  Read in page from target process memory and
             *  write it to coredump file.
             */
            error = copy_from_user(page, addr, sizeof (page));
            if (error != 0) {
                (void) fprintf(stderr, "unable to dump " TARGET_ABI_FMT_lx "\n",
                               addr);
                errno = -error;
                goto out;
            }
            if (dump_write(fd, page, TARGET_PAGE_SIZE) < 0)
                goto out;
        }
    }

 out:
    free_note_info(&info);
    if (mm != NULL)
        vma_delete(mm);
    (void) close(fd);

    if (errno != 0)
        return (-errno);
    return (0);
}
#endif /* USE_ELF_CORE_DUMP */

void do_init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
    init_thread(regs, infop);
}