x86: split off memory access helpers

Move memory access helpers to mem_helper.c.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

target-i386/mem_helper.c

@@ -0,0 +1,161 @@
+/*
+ *  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 "dyngen-exec.h"
+#include "helper.h"
+
+#if !defined(CONFIG_USER_ONLY)
+#include "softmmu_exec.h"
+#endif /* !defined(CONFIG_USER_ONLY) */
+
+/* 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(target_ulong a0)
+{
+    uint64_t d;
+    int eflags;
+
+    eflags = helper_cc_compute_all(CC_OP);
+    d = ldq(a0);
+    if (d == (((uint64_t)EDX << 32) | (uint32_t)EAX)) {
+        stq(a0, ((uint64_t)ECX << 32) | (uint32_t)EBX);
+        eflags |= CC_Z;
+    } else {
+        /* always do the store */
+        stq(a0, d);
+        EDX = (uint32_t)(d >> 32);
+        EAX = (uint32_t)d;
+        eflags &= ~CC_Z;
+    }
+    CC_SRC = eflags;
+}
+
+#ifdef TARGET_X86_64
+void helper_cmpxchg16b(target_ulong a0)
+{
+    uint64_t d0, d1;
+    int eflags;
+
+    if ((a0 & 0xf) != 0) {
+        raise_exception(env, EXCP0D_GPF);
+    }
+    eflags = helper_cc_compute_all(CC_OP);
+    d0 = ldq(a0);
+    d1 = ldq(a0 + 8);
+    if (d0 == EAX && d1 == EDX) {
+        stq(a0, EBX);
+        stq(a0 + 8, ECX);
+        eflags |= CC_Z;
+    } else {
+        /* always do the store */
+        stq(a0, d0);
+        stq(a0 + 8, d1);
+        EDX = d1;
+        EAX = d0;
+        eflags &= ~CC_Z;
+    }
+    CC_SRC = eflags;
+}
+#endif
+
+void helper_boundw(target_ulong a0, int v)
+{
+    int low, high;
+
+    low = ldsw(a0);
+    high = ldsw(a0 + 2);
+    v = (int16_t)v;
+    if (v < low || v > high) {
+        raise_exception(env, EXCP05_BOUND);
+    }
+}
+
+void helper_boundl(target_ulong a0, int v)
+{
+    int low, high;
+
+    low = ldl(a0);
+    high = ldl(a0 + 4);
+    if (v < low || v > high) {
+        raise_exception(env, EXCP05_BOUND);
+    }
+}
+
+#if !defined(CONFIG_USER_ONLY)
+
+#define MMUSUFFIX _mmu
+
+#define SHIFT 0
+#include "softmmu_template.h"
+
+#define SHIFT 1
+#include "softmmu_template.h"
+
+#define SHIFT 2
+#include "softmmu_template.h"
+
+#define SHIFT 3
+#include "softmmu_template.h"
+
+#endif
+
+#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(CPUX86State *env1, target_ulong addr, int is_write, int mmu_idx,
+              uintptr_t retaddr)
+{
+    TranslationBlock *tb;
+    int ret;
+    CPUX86State *saved_env;
+
+    saved_env = env;
+    env = env1;
+
+    ret = cpu_x86_handle_mmu_fault(env, addr, is_write, mmu_idx);
+    if (ret) {
+        if (retaddr) {
+            /* now we have a real cpu fault */
+            tb = tb_find_pc(retaddr);
+            if (tb) {
+                /* the PC is inside the translated code. It means that we have
+                   a virtual CPU fault */
+                cpu_restore_state(tb, env, retaddr);
+            }
+        }
+        raise_exception_err(env, env->exception_index, env->error_code);
+    }
+    env = saved_env;
+}
+#endif