Add qemu 2.4.0

[kvmfornfv.git] / qemu / target-i386 / mem_helper.c

diff --git a/qemu/target-i386/mem_helper.c b/qemu/target-i386/mem_helper.c
new file mode 100644 (file)
index 0000000..1aec8a5
--- /dev/null
+++ b/qemu/target-i386/mem_helper.c
@@ -0,0 +1,132 @@
+/*
+ *  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