target-i386/mem_helper.c

   1 /*
   2  *  x86 memory access helpers
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   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.
  10  *
  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.
  15  *
  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/>.
  18  */
  19
  20 #include "cpu.h"
  21 #include "dyngen-exec.h"
  22 #include "helper.h"
  23
  24 #if !defined(CONFIG_USER_ONLY)
  25 #include "softmmu_exec.h"
  26 #endif /* !defined(CONFIG_USER_ONLY) */
  27
  28 /* broken thread support */
  29
  30 static spinlock_t global_cpu_lock = SPIN_LOCK_UNLOCKED;
  31
  32 void helper_lock(void)
  33 {
  34     spin_lock(&global_cpu_lock);
  35 }
  36
  37 void helper_unlock(void)
  38 {
  39     spin_unlock(&global_cpu_lock);
  40 }
  41
  42 void helper_cmpxchg8b(target_ulong a0)
  43 {
  44     uint64_t d;
  45     int eflags;
  46
  47     eflags = helper_cc_compute_all(CC_OP);
  48     d = ldq(a0);
  49     if (d == (((uint64_t)EDX << 32) | (uint32_t)EAX)) {
  50         stq(a0, ((uint64_t)ECX << 32) | (uint32_t)EBX);
  51         eflags |= CC_Z;
  52     } else {
  53         /* always do the store */
  54         stq(a0, d);
  55         EDX = (uint32_t)(d >> 32);
  56         EAX = (uint32_t)d;
  57         eflags &= ~CC_Z;
  58     }
  59     CC_SRC = eflags;
  60 }
  61
  62 #ifdef TARGET_X86_64
  63 void helper_cmpxchg16b(target_ulong a0)
  64 {
  65     uint64_t d0, d1;
  66     int eflags;
  67
  68     if ((a0 & 0xf) != 0) {
  69         raise_exception(env, EXCP0D_GPF);
  70     }
  71     eflags = helper_cc_compute_all(CC_OP);
  72     d0 = ldq(a0);
  73     d1 = ldq(a0 + 8);
  74     if (d0 == EAX && d1 == EDX) {
  75         stq(a0, EBX);
  76         stq(a0 + 8, ECX);
  77         eflags |= CC_Z;
  78     } else {
  79         /* always do the store */
  80         stq(a0, d0);
  81         stq(a0 + 8, d1);
  82         EDX = d1;
  83         EAX = d0;
  84         eflags &= ~CC_Z;
  85     }
  86     CC_SRC = eflags;
  87 }
  88 #endif
  89
  90 void helper_boundw(target_ulong a0, int v)
  91 {
  92     int low, high;
  93
  94     low = ldsw(a0);
  95     high = ldsw(a0 + 2);
  96     v = (int16_t)v;
  97     if (v < low || v > high) {
  98         raise_exception(env, EXCP05_BOUND);
  99     }
 100 }
 101
 102 void helper_boundl(target_ulong a0, int v)
 103 {
 104     int low, high;
 105
 106     low = ldl(a0);
 107     high = ldl(a0 + 4);
 108     if (v < low || v > high) {
 109         raise_exception(env, EXCP05_BOUND);
 110     }
 111 }
 112
 113 #if !defined(CONFIG_USER_ONLY)
 114
 115 #define MMUSUFFIX _mmu
 116
 117 #define SHIFT 0
 118 #include "softmmu_template.h"
 119
 120 #define SHIFT 1
 121 #include "softmmu_template.h"
 122
 123 #define SHIFT 2
 124 #include "softmmu_template.h"
 125
 126 #define SHIFT 3
 127 #include "softmmu_template.h"
 128
 129 #endif
 130
 131 #if !defined(CONFIG_USER_ONLY)
 132 /* try to fill the TLB and return an exception if error. If retaddr is
 133    NULL, it means that the function was called in C code (i.e. not
 134    from generated code or from helper.c) */
 135 /* XXX: fix it to restore all registers */
 136 void tlb_fill(CPUX86State *env1, target_ulong addr, int is_write, int mmu_idx,
 137               uintptr_t retaddr)
 138 {
 139     TranslationBlock *tb;
 140     int ret;
 141     CPUX86State *saved_env;
 142
 143     saved_env = env;
 144     env = env1;
 145
 146     ret = cpu_x86_handle_mmu_fault(env, addr, is_write, mmu_idx);
 147     if (ret) {
 148         if (retaddr) {
 149             /* now we have a real cpu fault */
 150             tb = tb_find_pc(retaddr);
 151             if (tb) {
 152                 /* the PC is inside the translated code. It means that we have
 153                    a virtual CPU fault */
 154                 cpu_restore_state(tb, env, retaddr);
 155             }
 156         }
 157         raise_exception_err(env, env->exception_index, env->error_code);
 158     }
 159     env = saved_env;
 160 }
 161 #endif