xref: /qemu/target/alpha/mem_helper.c (revision 6ad4d7eed05a1e23537fc92b50f898f5977f37e6)

/*
 *  Helpers for loads and stores
 *
 *  Copyright (c) 2007 Jocelyn Mayer
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */

#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/helper-proto.h"
#include "exec/exec-all.h"
#include "exec/cpu_ldst.h"

/* Softmmu support */
#ifndef CONFIG_USER_ONLY
void alpha_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
                                   MMUAccessType access_type,
                                   int mmu_idx, uintptr_t retaddr)
{
    AlphaCPU *cpu = ALPHA_CPU(cs);
    CPUAlphaState *env = &cpu->env;
    uint64_t pc;
    uint32_t insn;

    if (retaddr) {
        cpu_restore_state(cs, retaddr);
    }

    pc = env->pc;
    insn = cpu_ldl_code(env, pc);

    env->trap_arg0 = addr;
    env->trap_arg1 = insn >> 26;                /* opcode */
    env->trap_arg2 = (insn >> 21) & 31;         /* dest regno */
    cs->exception_index = EXCP_UNALIGN;
    env->error_code = 0;
    cpu_loop_exit(cs);
}

void alpha_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
                                     vaddr addr, unsigned size,
                                     MMUAccessType access_type,
                                     int mmu_idx, MemTxAttrs attrs,
                                     MemTxResult response, uintptr_t retaddr)
{
    AlphaCPU *cpu = ALPHA_CPU(cs);
    CPUAlphaState *env = &cpu->env;

    if (retaddr) {
        cpu_restore_state(cs, retaddr);
    }

    env->trap_arg0 = addr;
    env->trap_arg1 = access_type == MMU_DATA_STORE ? 1 : 0;
    cs->exception_index = EXCP_MCHK;
    env->error_code = 0;
    cpu_loop_exit(cs);
}

/* try to fill the TLB and return an exception if error. If retaddr is
   NULL, it means that the function was called in C code (i.e. not
   from generated code or from helper.c) */
/* XXX: fix it to restore all registers */
void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
              int mmu_idx, uintptr_t retaddr)
{
    int ret;

    ret = alpha_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx);
    if (unlikely(ret != 0)) {
        if (retaddr) {
            cpu_restore_state(cs, retaddr);
        }
        /* Exception index and error code are already set */
        cpu_loop_exit(cs);
    }
}
#endif /* CONFIG_USER_ONLY */