qemu/target/alpha/mem_helper.c

/*
 *  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 2.1 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"

static void do_unaligned_access(CPUAlphaState *env, vaddr addr, uintptr_t retaddr)
{
    uint64_t pc;
    uint32_t insn;

    cpu_restore_state(env_cpu(env), 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 */
}

#ifdef CONFIG_USER_ONLY
void alpha_cpu_record_sigbus(CPUState *cs, vaddr addr,
                             MMUAccessType access_type, uintptr_t retaddr)
{
    AlphaCPU *cpu = ALPHA_CPU(cs);
    CPUAlphaState *env = &cpu->env;

    do_unaligned_access(env, addr, retaddr);
}
#else
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;

    do_unaligned_access(env, addr, retaddr);
    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;

    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_restore(cs, retaddr);
}
#endif /* CONFIG_USER_ONLY */