mirror of https://gitee.com/openkylin/qemu.git
133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/*
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* x86 memory access helpers
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "cpu.h"
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#include "exec/helper-proto.h"
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#include "exec/cpu_ldst.h"
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/* broken thread support */
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static spinlock_t global_cpu_lock = SPIN_LOCK_UNLOCKED;
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void helper_lock(void)
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{
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spin_lock(&global_cpu_lock);
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}
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void helper_unlock(void)
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{
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spin_unlock(&global_cpu_lock);
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}
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void helper_cmpxchg8b(CPUX86State *env, target_ulong a0)
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{
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uint64_t d;
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int eflags;
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eflags = cpu_cc_compute_all(env, CC_OP);
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d = cpu_ldq_data(env, a0);
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if (d == (((uint64_t)env->regs[R_EDX] << 32) | (uint32_t)env->regs[R_EAX])) {
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cpu_stq_data(env, a0, ((uint64_t)env->regs[R_ECX] << 32) | (uint32_t)env->regs[R_EBX]);
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eflags |= CC_Z;
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} else {
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/* always do the store */
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cpu_stq_data(env, a0, d);
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env->regs[R_EDX] = (uint32_t)(d >> 32);
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env->regs[R_EAX] = (uint32_t)d;
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eflags &= ~CC_Z;
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}
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CC_SRC = eflags;
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}
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#ifdef TARGET_X86_64
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void helper_cmpxchg16b(CPUX86State *env, target_ulong a0)
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{
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uint64_t d0, d1;
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int eflags;
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if ((a0 & 0xf) != 0) {
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raise_exception(env, EXCP0D_GPF);
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}
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eflags = cpu_cc_compute_all(env, CC_OP);
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d0 = cpu_ldq_data(env, a0);
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d1 = cpu_ldq_data(env, a0 + 8);
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if (d0 == env->regs[R_EAX] && d1 == env->regs[R_EDX]) {
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cpu_stq_data(env, a0, env->regs[R_EBX]);
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cpu_stq_data(env, a0 + 8, env->regs[R_ECX]);
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eflags |= CC_Z;
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} else {
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/* always do the store */
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cpu_stq_data(env, a0, d0);
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cpu_stq_data(env, a0 + 8, d1);
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env->regs[R_EDX] = d1;
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env->regs[R_EAX] = d0;
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eflags &= ~CC_Z;
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}
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CC_SRC = eflags;
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}
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#endif
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void helper_boundw(CPUX86State *env, target_ulong a0, int v)
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{
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int low, high;
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low = cpu_ldsw_data(env, a0);
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high = cpu_ldsw_data(env, a0 + 2);
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v = (int16_t)v;
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if (v < low || v > high) {
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raise_exception(env, EXCP05_BOUND);
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}
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}
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void helper_boundl(CPUX86State *env, target_ulong a0, int v)
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{
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int low, high;
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low = cpu_ldl_data(env, a0);
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high = cpu_ldl_data(env, a0 + 4);
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if (v < low || v > high) {
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raise_exception(env, EXCP05_BOUND);
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}
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}
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#if !defined(CONFIG_USER_ONLY)
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/* try to fill the TLB and return an exception if error. If retaddr is
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* NULL, it means that the function was called in C code (i.e. not
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* from generated code or from helper.c)
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*/
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/* XXX: fix it to restore all registers */
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void tlb_fill(CPUState *cs, target_ulong addr, int is_write, int mmu_idx,
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uintptr_t retaddr)
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{
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int ret;
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ret = x86_cpu_handle_mmu_fault(cs, addr, is_write, mmu_idx);
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if (ret) {
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X86CPU *cpu = X86_CPU(cs);
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CPUX86State *env = &cpu->env;
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if (retaddr) {
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/* now we have a real cpu fault */
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cpu_restore_state(cs, retaddr);
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}
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raise_exception_err(env, cs->exception_index, env->error_code);
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}
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}
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#endif
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