1 /*
2 * Support for o32 Linux/MIPS ELF binaries.
3 *
4 * Copyright (C) 1999, 2001 Ralf Baechle
5 * Copyright (C) 1999, 2001 Silicon Graphics, Inc.
6 *
7 * Heavily inspired by the 32-bit Sparc compat code which is
8 * Copyright (C) 1995, 1996, 1997, 1998 David S. Miller (davem@redhat.com)
9 * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek (jj@ultra.linux.cz)
10 */
11
12 #define ELF_ARCH EM_MIPS
13 #define ELF_CLASS ELFCLASS32
14 #ifdef __MIPSEB__
15 #define ELF_DATA ELFDATA2MSB;
16 #else /* __MIPSEL__ */
17 #define ELF_DATA ELFDATA2LSB;
18 #endif
19
20 /* ELF register definitions */
21 #define ELF_NGREG 45
22 #define ELF_NFPREG 33
23
24 typedef unsigned int elf_greg_t;
25 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
26
27 typedef double elf_fpreg_t;
28 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
29
30 /*
31 * This is used to ensure we don't load something for the wrong architecture.
32 */
33 #define elf_check_arch(hdr) \
34 ({ \
35 int __res = 1; \
36 struct elfhdr *__h = (hdr); \
37 \
38 if (__h->e_machine != EM_MIPS) \
39 __res = 0; \
40 if (__h->e_ident[EI_CLASS] != ELFCLASS32) \
41 __res = 0; \
42 if ((__h->e_flags & EF_MIPS_ABI2) != 0) \
43 __res = 0; \
44 if (((__h->e_flags & EF_MIPS_ABI) != 0) && \
45 ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32)) \
46 __res = 0; \
47 \
48 __res; \
49 })
50
51 #define TASK32_SIZE 0x7fff8000UL
52 #undef ELF_ET_DYN_BASE
53 #define ELF_ET_DYN_BASE (TASK32_SIZE / 3 * 2)
54
55 #include <asm/processor.h>
56
57 /*
58 * When this file is selected, we are definitely running a 64bit kernel.
59 * So using the right regs define in asm/reg.h
60 */
61 #define WANT_COMPAT_REG_H
62
63 /* These MUST be defined before elf.h gets included */
64 extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
65 #define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
66 #define ELF_CORE_COPY_TASK_REGS(_tsk, _dest) \
67 ({ \
68 int __res = 1; \
69 elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk)); \
70 __res; \
71 })
72
73 #include <linux/module.h>
74 #include <linux/elfcore.h>
75 #include <linux/compat.h>
76 #include <linux/math64.h>
77
78 #define elf_prstatus elf_prstatus32
79 struct elf_prstatus32
80 {
81 struct elf_siginfo pr_info; /* Info associated with signal */
82 short pr_cursig; /* Current signal */
83 unsigned int pr_sigpend; /* Set of pending signals */
84 unsigned int pr_sighold; /* Set of held signals */
85 pid_t pr_pid;
86 pid_t pr_ppid;
87 pid_t pr_pgrp;
88 pid_t pr_sid;
89 struct compat_timeval pr_utime; /* User time */
90 struct compat_timeval pr_stime; /* System time */
91 struct compat_timeval pr_cutime;/* Cumulative user time */
92 struct compat_timeval pr_cstime;/* Cumulative system time */
93 elf_gregset_t pr_reg; /* GP registers */
94 int pr_fpvalid; /* True if math co-processor being used. */
95 };
96
97 #define elf_prpsinfo elf_prpsinfo32
98 struct elf_prpsinfo32
99 {
100 char pr_state; /* numeric process state */
101 char pr_sname; /* char for pr_state */
102 char pr_zomb; /* zombie */
103 char pr_nice; /* nice val */
104 unsigned int pr_flag; /* flags */
105 __kernel_uid_t pr_uid;
106 __kernel_gid_t pr_gid;
107 pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
108 /* Lots missing */
109 char pr_fname[16]; /* filename of executable */
110 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
111 };
112
113 #define elf_caddr_t u32
114 #define init_elf_binfmt init_elf32_binfmt
115
116 #define jiffies_to_timeval jiffies_to_compat_timeval
117 static inline void
jiffies_to_compat_timeval(unsigned long jiffies,struct compat_timeval * value)118 jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
119 {
120 /*
121 * Convert jiffies to nanoseconds and separate with
122 * one divide.
123 */
124 u64 nsec = (u64)jiffies * TICK_NSEC;
125 u32 rem;
126 value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
127 value->tv_usec = rem / NSEC_PER_USEC;
128 }
129
elf32_core_copy_regs(elf_gregset_t grp,struct pt_regs * regs)130 void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
131 {
132 int i;
133
134 for (i = 0; i < EF_R0; i++)
135 grp[i] = 0;
136 grp[EF_R0] = 0;
137 for (i = 1; i <= 31; i++)
138 grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
139 grp[EF_R26] = 0;
140 grp[EF_R27] = 0;
141 grp[EF_LO] = (elf_greg_t) regs->lo;
142 grp[EF_HI] = (elf_greg_t) regs->hi;
143 grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
144 grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
145 grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
146 grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
147 #ifdef EF_UNUSED0
148 grp[EF_UNUSED0] = 0;
149 #endif
150 }
151
152 MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
153 MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
154
155 #undef MODULE_DESCRIPTION
156 #undef MODULE_AUTHOR
157
158 #undef TASK_SIZE
159 #define TASK_SIZE TASK_SIZE32
160
161 #include "../../../fs/binfmt_elf.c"
162