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/*
* x86 memory access helpers
*
* Copyright (c) 2003 Fabrice Bellard
*
* 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 "cpu.h"
#include "exec/helper-proto.h"
#include "exec/cpu_ldst.h"
/* broken thread support */
static spinlock_t global_cpu_lock = SPIN_LOCK_UNLOCKED;
void helper_lock(void)
{
spin_lock(&global_cpu_lock);
}
void helper_unlock(void)
{
spin_unlock(&global_cpu_lock);
}
void helper_cmpxchg8b(CPUX86State *env, target_ulong a0)
{
uint64_t d;
int eflags;
eflags = cpu_cc_compute_all(env, CC_OP);
d = cpu_ldq_data(env, a0);
if (d == (((uint64_t)env->regs[R_EDX] << 32) | (uint32_t)env->regs[R_EAX])) {
cpu_stq_data(env, a0, ((uint64_t)env->regs[R_ECX] << 32) | (uint32_t)env->regs[R_EBX]);
eflags |= CC_Z;
} else {
/* always do the store */
cpu_stq_data(env, a0, d);
env->regs[R_EDX] = (uint32_t)(d >> 32);
env->regs[R_EAX] = (uint32_t)d;
eflags &= ~CC_Z;
}
CC_SRC = eflags;
}
#ifdef TARGET_X86_64
void helper_cmpxchg16b(CPUX86State *env, target_ulong a0)
{
uint64_t d0, d1;
int eflags;
if ((a0 & 0xf) != 0) {
raise_exception(env, EXCP0D_GPF);
}
eflags = cpu_cc_compute_all(env, CC_OP);
d0 = cpu_ldq_data(env, a0);
d1 = cpu_ldq_data(env, a0 + 8);
if (d0 == env->regs[R_EAX] && d1 == env->regs[R_EDX]) {
cpu_stq_data(env, a0, env->regs[R_EBX]);
cpu_stq_data(env, a0 + 8, env->regs[R_ECX]);
eflags |= CC_Z;
} else {
/* always do the store */
cpu_stq_data(env, a0, d0);
cpu_stq_data(env, a0 + 8, d1);
env->regs[R_EDX] = d1;
env->regs[R_EAX] = d0;
eflags &= ~CC_Z;
}
CC_SRC = eflags;
}
#endif
void helper_boundw(CPUX86State *env, target_ulong a0, int v)
{
int low, high;
low = cpu_ldsw_data(env, a0);
high = cpu_ldsw_data(env, a0 + 2);
v = (int16_t)v;
if (v < low || v > high) {
raise_exception(env, EXCP05_BOUND);
}
}
void helper_boundl(CPUX86State *env, target_ulong a0, int v)
{
int low, high;
low = cpu_ldl_data(env, a0);
high = cpu_ldl_data(env, a0 + 4);
if (v < low || v > high) {
raise_exception(env, EXCP05_BOUND);
}
}
#if !defined(CONFIG_USER_ONLY)
/* 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, int is_write, int mmu_idx,
uintptr_t retaddr)
{
int ret;
ret = x86_cpu_handle_mmu_fault(cs, addr, is_write, mmu_idx);
if (ret) {
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
if (retaddr) {
/* now we have a real cpu fault */
cpu_restore_state(cs, retaddr);
}
raise_exception_err(env, cs->exception_index, env->error_code);
}
}
#endif
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