2 * x86 memory access helpers
4 * Copyright (c) 2003 Fabrice Bellard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
23 #if !defined(CONFIG_USER_ONLY)
24 #include "exec/softmmu_exec.h"
25 #endif /* !defined(CONFIG_USER_ONLY) */
27 /* broken thread support */
29 static spinlock_t global_cpu_lock = SPIN_LOCK_UNLOCKED;
31 void helper_lock(void)
33 spin_lock(&global_cpu_lock);
36 void helper_unlock(void)
38 spin_unlock(&global_cpu_lock);
41 void helper_cmpxchg8b(CPUX86State *env, target_ulong a0)
46 eflags = cpu_cc_compute_all(env, CC_OP);
47 d = cpu_ldq_data(env, a0);
48 if (d == (((uint64_t)EDX << 32) | (uint32_t)EAX)) {
49 cpu_stq_data(env, a0, ((uint64_t)ECX << 32) | (uint32_t)EBX);
52 /* always do the store */
53 cpu_stq_data(env, a0, d);
54 EDX = (uint32_t)(d >> 32);
62 void helper_cmpxchg16b(CPUX86State *env, target_ulong a0)
67 if ((a0 & 0xf) != 0) {
68 raise_exception(env, EXCP0D_GPF);
70 eflags = cpu_cc_compute_all(env, CC_OP);
71 d0 = cpu_ldq_data(env, a0);
72 d1 = cpu_ldq_data(env, a0 + 8);
73 if (d0 == EAX && d1 == EDX) {
74 cpu_stq_data(env, a0, EBX);
75 cpu_stq_data(env, a0 + 8, ECX);
78 /* always do the store */
79 cpu_stq_data(env, a0, d0);
80 cpu_stq_data(env, a0 + 8, d1);
89 void helper_boundw(CPUX86State *env, target_ulong a0, int v)
93 low = cpu_ldsw_data(env, a0);
94 high = cpu_ldsw_data(env, a0 + 2);
96 if (v < low || v > high) {
97 raise_exception(env, EXCP05_BOUND);
101 void helper_boundl(CPUX86State *env, target_ulong a0, int v)
105 low = cpu_ldl_data(env, a0);
106 high = cpu_ldl_data(env, a0 + 4);
107 if (v < low || v > high) {
108 raise_exception(env, EXCP05_BOUND);
112 #if !defined(CONFIG_USER_ONLY)
114 #define MMUSUFFIX _mmu
117 #include "exec/softmmu_template.h"
120 #include "exec/softmmu_template.h"
123 #include "exec/softmmu_template.h"
126 #include "exec/softmmu_template.h"
130 #if !defined(CONFIG_USER_ONLY)
131 /* try to fill the TLB and return an exception if error. If retaddr is
132 NULL, it means that the function was called in C code (i.e. not
133 from generated code or from helper.c) */
134 /* XXX: fix it to restore all registers */
135 void tlb_fill(CPUX86State *env, target_ulong addr, int is_write, int mmu_idx,
140 ret = cpu_x86_handle_mmu_fault(env, addr, is_write, mmu_idx);
143 /* now we have a real cpu fault */
144 cpu_restore_state(env, retaddr);
146 raise_exception_err(env, env->exception_index, env->error_code);