tcg: Rename tcg-target.c to tcg-target.inc.c

Rename the per-architecture tcg-target.c files to tcg-target.inc.c.
This makes it clearer that they are not intended to be standalone
C files, but are instead #included into another source file.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <1456238983-10160-2-git-send-email-peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 2464 insertions, 0 deletions

diff --git a/tcg/i386/tcg-target.inc.c b/tcg/i386/tcg-target.inc.c
new file mode 100644
index 0000000000..d90636cb4e
--- /dev/null
+++ b/tcg/i386/tcg-target.inc.c
@@ -0,0 +1,2464 @@
+/*
+ * Tiny Code Generator for QEMU
+ *
+ * Copyright (c) 2008 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "tcg-be-ldst.h"
+
+#ifndef NDEBUG
+static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
+#if TCG_TARGET_REG_BITS == 64
+    "%rax", "%rcx", "%rdx", "%rbx", "%rsp", "%rbp", "%rsi", "%rdi",
+    "%r8",  "%r9",  "%r10", "%r11", "%r12", "%r13", "%r14", "%r15",
+#else
+    "%eax", "%ecx", "%edx", "%ebx", "%esp", "%ebp", "%esi", "%edi",
+#endif
+};
+#endif
+
+static const int tcg_target_reg_alloc_order[] = {
+#if TCG_TARGET_REG_BITS == 64
+    TCG_REG_RBP,
+    TCG_REG_RBX,
+    TCG_REG_R12,
+    TCG_REG_R13,
+    TCG_REG_R14,
+    TCG_REG_R15,
+    TCG_REG_R10,
+    TCG_REG_R11,
+    TCG_REG_R9,
+    TCG_REG_R8,
+    TCG_REG_RCX,
+    TCG_REG_RDX,
+    TCG_REG_RSI,
+    TCG_REG_RDI,
+    TCG_REG_RAX,
+#else
+    TCG_REG_EBX,
+    TCG_REG_ESI,
+    TCG_REG_EDI,
+    TCG_REG_EBP,
+    TCG_REG_ECX,
+    TCG_REG_EDX,
+    TCG_REG_EAX,
+#endif
+};
+
+static const int tcg_target_call_iarg_regs[] = {
+#if TCG_TARGET_REG_BITS == 64
+#if defined(_WIN64)
+    TCG_REG_RCX,
+    TCG_REG_RDX,
+#else
+    TCG_REG_RDI,
+    TCG_REG_RSI,
+    TCG_REG_RDX,
+    TCG_REG_RCX,
+#endif
+    TCG_REG_R8,
+    TCG_REG_R9,
+#else
+    /* 32 bit mode uses stack based calling convention (GCC default). */
+#endif
+};
+
+static const int tcg_target_call_oarg_regs[] = {
+    TCG_REG_EAX,
+#if TCG_TARGET_REG_BITS == 32
+    TCG_REG_EDX
+#endif
+};
+
+/* Constants we accept.  */
+#define TCG_CT_CONST_S32 0x100
+#define TCG_CT_CONST_U32 0x200
+#define TCG_CT_CONST_I32 0x400
+
+/* Registers used with L constraint, which are the first argument 
+   registers on x86_64, and two random call clobbered registers on
+   i386. */
+#if TCG_TARGET_REG_BITS == 64
+# define TCG_REG_L0 tcg_target_call_iarg_regs[0]
+# define TCG_REG_L1 tcg_target_call_iarg_regs[1]
+#else
+# define TCG_REG_L0 TCG_REG_EAX
+# define TCG_REG_L1 TCG_REG_EDX
+#endif
+
+/* The host compiler should supply <cpuid.h> to enable runtime features
+   detection, as we're not going to go so far as our own inline assembly.
+   If not available, default values will be assumed.  */
+#if defined(CONFIG_CPUID_H)
+#include <cpuid.h>
+#endif
+
+/* For 32-bit, we are going to attempt to determine at runtime whether cmov
+   is available.  */
+#if TCG_TARGET_REG_BITS == 64
+# define have_cmov 1
+#elif defined(CONFIG_CPUID_H) && defined(bit_CMOV)
+static bool have_cmov;
+#else
+# define have_cmov 0
+#endif
+
+/* If bit_MOVBE is defined in cpuid.h (added in GCC version 4.6), we are
+   going to attempt to determine at runtime whether movbe is available.  */
+#if defined(CONFIG_CPUID_H) && defined(bit_MOVBE)
+static bool have_movbe;
+#else
+# define have_movbe 0
+#endif
+
+/* We need this symbol in tcg-target.h, and we can't properly conditionalize
+   it there.  Therefore we always define the variable.  */
+bool have_bmi1;
+
+#if defined(CONFIG_CPUID_H) && defined(bit_BMI2)
+static bool have_bmi2;
+#else
+# define have_bmi2 0
+#endif
+
+static tcg_insn_unit *tb_ret_addr;
+
+static void patch_reloc(tcg_insn_unit *code_ptr, int type,
+                        intptr_t value, intptr_t addend)
+{
+    value += addend;
+    switch(type) {
+    case R_386_PC32:
+        value -= (uintptr_t)code_ptr;
+        if (value != (int32_t)value) {
+            tcg_abort();
+        }
+        tcg_patch32(code_ptr, value);
+        break;
+    case R_386_PC8:
+        value -= (uintptr_t)code_ptr;
+        if (value != (int8_t)value) {
+            tcg_abort();
+        }
+        tcg_patch8(code_ptr, value);
+        break;
+    default:
+        tcg_abort();
+    }
+}
+
+/* parse target specific constraints */
+static int target_parse_constraint(TCGArgConstraint *ct, const char **pct_str)
+{
+    const char *ct_str;
+
+    ct_str = *pct_str;
+    switch(ct_str[0]) {
+    case 'a':
+        ct->ct |= TCG_CT_REG;
+        tcg_regset_set_reg(ct->u.regs, TCG_REG_EAX);
+        break;
+    case 'b':
+        ct->ct |= TCG_CT_REG;
+        tcg_regset_set_reg(ct->u.regs, TCG_REG_EBX);
+        break;
+    case 'c':
+    case_c:
+        ct->ct |= TCG_CT_REG;
+        tcg_regset_set_reg(ct->u.regs, TCG_REG_ECX);
+        break;
+    case 'd':
+        ct->ct |= TCG_CT_REG;
+        tcg_regset_set_reg(ct->u.regs, TCG_REG_EDX);
+        break;
+    case 'S':
+        ct->ct |= TCG_CT_REG;
+        tcg_regset_set_reg(ct->u.regs, TCG_REG_ESI);
+        break;
+    case 'D':
+        ct->ct |= TCG_CT_REG;
+        tcg_regset_set_reg(ct->u.regs, TCG_REG_EDI);
+        break;
+    case 'q':
+        ct->ct |= TCG_CT_REG;
+        if (TCG_TARGET_REG_BITS == 64) {
+            tcg_regset_set32(ct->u.regs, 0, 0xffff);
+        } else {
+            tcg_regset_set32(ct->u.regs, 0, 0xf);
+        }
+        break;
+    case 'Q':
+        ct->ct |= TCG_CT_REG;
+        tcg_regset_set32(ct->u.regs, 0, 0xf);
+        break;
+    case 'r':
+    case_r:
+        ct->ct |= TCG_CT_REG;
+        if (TCG_TARGET_REG_BITS == 64) {
+            tcg_regset_set32(ct->u.regs, 0, 0xffff);
+        } else {
+            tcg_regset_set32(ct->u.regs, 0, 0xff);
+        }
+        break;
+    case 'C':
+        /* With SHRX et al, we need not use ECX as shift count register.  */
+        if (have_bmi2) {
+            goto case_r;
+        } else {
+            goto case_c;
+        }
+
+        /* qemu_ld/st address constraint */
+    case 'L':
+        ct->ct |= TCG_CT_REG;
+        if (TCG_TARGET_REG_BITS == 64) {
+            tcg_regset_set32(ct->u.regs, 0, 0xffff);
+        } else {
+            tcg_regset_set32(ct->u.regs, 0, 0xff);
+        }
+        tcg_regset_reset_reg(ct->u.regs, TCG_REG_L0);
+        tcg_regset_reset_reg(ct->u.regs, TCG_REG_L1);
+        break;
+
+    case 'e':
+        ct->ct |= TCG_CT_CONST_S32;
+        break;
+    case 'Z':
+        ct->ct |= TCG_CT_CONST_U32;
+        break;
+    case 'I':
+        ct->ct |= TCG_CT_CONST_I32;
+        break;
+
+    default:
+        return -1;
+    }
+    ct_str++;
+    *pct_str = ct_str;
+    return 0;
+}
+
+/* test if a constant matches the constraint */
+static inline int tcg_target_const_match(tcg_target_long val, TCGType type,
+                                         const TCGArgConstraint *arg_ct)
+{
+    int ct = arg_ct->ct;
+    if (ct & TCG_CT_CONST) {
+        return 1;
+    }
+    if ((ct & TCG_CT_CONST_S32) && val == (int32_t)val) {
+        return 1;
+    }
+    if ((ct & TCG_CT_CONST_U32) && val == (uint32_t)val) {
+        return 1;
+    }
+    if ((ct & TCG_CT_CONST_I32) && ~val == (int32_t)~val) {
+        return 1;
+    }
+    return 0;
+}
+
+#if TCG_TARGET_REG_BITS == 64
+# define LOWREGMASK(x)	((x) & 7)
+#else
+# define LOWREGMASK(x)	(x)
+#endif
+
+#define P_EXT		0x100		/* 0x0f opcode prefix */
+#define P_EXT38         0x200           /* 0x0f 0x38 opcode prefix */
+#define P_DATA16        0x400           /* 0x66 opcode prefix */
+#if TCG_TARGET_REG_BITS == 64
+# define P_ADDR32       0x800           /* 0x67 opcode prefix */
+# define P_REXW         0x1000          /* Set REX.W = 1 */
+# define P_REXB_R       0x2000          /* REG field as byte register */
+# define P_REXB_RM      0x4000          /* R/M field as byte register */
+# define P_GS           0x8000          /* gs segment override */
+#else
+# define P_ADDR32	0
+# define P_REXW		0
+# define P_REXB_R	0
+# define P_REXB_RM	0
+# define P_GS           0
+#endif
+#define P_SIMDF3        0x10000         /* 0xf3 opcode prefix */
+#define P_SIMDF2        0x20000         /* 0xf2 opcode prefix */
+
+#define OPC_ARITH_EvIz	(0x81)
+#define OPC_ARITH_EvIb	(0x83)
+#define OPC_ARITH_GvEv	(0x03)		/* ... plus (ARITH_FOO << 3) */
+#define OPC_ANDN        (0xf2 | P_EXT38)
+#define OPC_ADD_GvEv	(OPC_ARITH_GvEv | (ARITH_ADD << 3))
+#define OPC_BSWAP	(0xc8 | P_EXT)
+#define OPC_CALL_Jz	(0xe8)
+#define OPC_CMOVCC      (0x40 | P_EXT)  /* ... plus condition code */
+#define OPC_CMP_GvEv	(OPC_ARITH_GvEv | (ARITH_CMP << 3))
+#define OPC_DEC_r32	(0x48)
+#define OPC_IMUL_GvEv	(0xaf | P_EXT)
+#define OPC_IMUL_GvEvIb	(0x6b)
+#define OPC_IMUL_GvEvIz	(0x69)
+#define OPC_INC_r32	(0x40)
+#define OPC_JCC_long	(0x80 | P_EXT)	/* ... plus condition code */
+#define OPC_JCC_short	(0x70)		/* ... plus condition code */
+#define OPC_JMP_long	(0xe9)
+#define OPC_JMP_short	(0xeb)
+#define OPC_LEA         (0x8d)
+#define OPC_MOVB_EvGv	(0x88)		/* stores, more or less */
+#define OPC_MOVL_EvGv	(0x89)		/* stores, more or less */
+#define OPC_MOVL_GvEv	(0x8b)		/* loads, more or less */
+#define OPC_MOVB_EvIz   (0xc6)
+#define OPC_MOVL_EvIz	(0xc7)
+#define OPC_MOVL_Iv     (0xb8)
+#define OPC_MOVBE_GyMy  (0xf0 | P_EXT38)
+#define OPC_MOVBE_MyGy  (0xf1 | P_EXT38)
+#define OPC_MOVSBL	(0xbe | P_EXT)
+#define OPC_MOVSWL	(0xbf | P_EXT)
+#define OPC_MOVSLQ	(0x63 | P_REXW)
+#define OPC_MOVZBL	(0xb6 | P_EXT)
+#define OPC_MOVZWL	(0xb7 | P_EXT)
+#define OPC_POP_r32	(0x58)
+#define OPC_PUSH_r32	(0x50)
+#define OPC_PUSH_Iv	(0x68)
+#define OPC_PUSH_Ib	(0x6a)
+#define OPC_RET		(0xc3)
+#define OPC_SETCC	(0x90 | P_EXT | P_REXB_RM) /* ... plus cc */
+#define OPC_SHIFT_1	(0xd1)
+#define OPC_SHIFT_Ib	(0xc1)
+#define OPC_SHIFT_cl	(0xd3)
+#define OPC_SARX        (0xf7 | P_EXT38 | P_SIMDF3)
+#define OPC_SHLX        (0xf7 | P_EXT38 | P_DATA16)
+#define OPC_SHRX        (0xf7 | P_EXT38 | P_SIMDF2)
+#define OPC_TESTL	(0x85)
+#define OPC_XCHG_ax_r32	(0x90)
+
+#define OPC_GRP3_Ev	(0xf7)
+#define OPC_GRP5	(0xff)
+
+/* Group 1 opcode extensions for 0x80-0x83.
+   These are also used as modifiers for OPC_ARITH.  */
+#define ARITH_ADD 0
+#define ARITH_OR  1
+#define ARITH_ADC 2
+#define ARITH_SBB 3
+#define ARITH_AND 4
+#define ARITH_SUB 5
+#define ARITH_XOR 6
+#define ARITH_CMP 7
+
+/* Group 2 opcode extensions for 0xc0, 0xc1, 0xd0-0xd3.  */
+#define SHIFT_ROL 0
+#define SHIFT_ROR 1
+#define SHIFT_SHL 4
+#define SHIFT_SHR 5
+#define SHIFT_SAR 7
+
+/* Group 3 opcode extensions for 0xf6, 0xf7.  To be used with OPC_GRP3.  */
+#define EXT3_NOT   2
+#define EXT3_NEG   3
+#define EXT3_MUL   4
+#define EXT3_IMUL  5
+#define EXT3_DIV   6
+#define EXT3_IDIV  7
+
+/* Group 5 opcode extensions for 0xff.  To be used with OPC_GRP5.  */
+#define EXT5_INC_Ev	0
+#define EXT5_DEC_Ev	1
+#define EXT5_CALLN_Ev	2
+#define EXT5_JMPN_Ev	4
+
+/* Condition codes to be added to OPC_JCC_{long,short}.  */
+#define JCC_JMP (-1)
+#define JCC_JO  0x0
+#define JCC_JNO 0x1
+#define JCC_JB  0x2
+#define JCC_JAE 0x3
+#define JCC_JE  0x4
+#define JCC_JNE 0x5
+#define JCC_JBE 0x6
+#define JCC_JA  0x7
+#define JCC_JS  0x8
+#define JCC_JNS 0x9
+#define JCC_JP  0xa
+#define JCC_JNP 0xb
+#define JCC_JL  0xc
+#define JCC_JGE 0xd
+#define JCC_JLE 0xe
+#define JCC_JG  0xf
+
+static const uint8_t tcg_cond_to_jcc[] = {
+    [TCG_COND_EQ] = JCC_JE,
+    [TCG_COND_NE] = JCC_JNE,
+    [TCG_COND_LT] = JCC_JL,
+    [TCG_COND_GE] = JCC_JGE,
+    [TCG_COND_LE] = JCC_JLE,
+    [TCG_COND_GT] = JCC_JG,
+    [TCG_COND_LTU] = JCC_JB,
+    [TCG_COND_GEU] = JCC_JAE,
+    [TCG_COND_LEU] = JCC_JBE,
+    [TCG_COND_GTU] = JCC_JA,
+};
+
+#if TCG_TARGET_REG_BITS == 64
+static void tcg_out_opc(TCGContext *s, int opc, int r, int rm, int x)
+{
+    int rex;
+
+    if (opc & P_GS) {
+        tcg_out8(s, 0x65);
+    }
+    if (opc & P_DATA16) {
+        /* We should never be asking for both 16 and 64-bit operation.  */
+        assert((opc & P_REXW) == 0);
+        tcg_out8(s, 0x66);
+    }
+    if (opc & P_ADDR32) {
+        tcg_out8(s, 0x67);
+    }
+
+    rex = 0;
+    rex |= (opc & P_REXW) ? 0x8 : 0x0;  /* REX.W */
+    rex |= (r & 8) >> 1;                /* REX.R */
+    rex |= (x & 8) >> 2;                /* REX.X */
+    rex |= (rm & 8) >> 3;               /* REX.B */
+
+    /* P_REXB_{R,RM} indicates that the given register is the low byte.
+       For %[abcd]l we need no REX prefix, but for %{si,di,bp,sp}l we do,
+       as otherwise the encoding indicates %[abcd]h.  Note that the values
+       that are ORed in merely indicate that the REX byte must be present;
+       those bits get discarded in output.  */
+    rex |= opc & (r >= 4 ? P_REXB_R : 0);
+    rex |= opc & (rm >= 4 ? P_REXB_RM : 0);
+
+    if (rex) {
+        tcg_out8(s, (uint8_t)(rex | 0x40));
+    }
+
+    if (opc & (P_EXT | P_EXT38)) {
+        tcg_out8(s, 0x0f);
+        if (opc & P_EXT38) {
+            tcg_out8(s, 0x38);
+        }
+    }
+
+    tcg_out8(s, opc);
+}
+#else
+static void tcg_out_opc(TCGContext *s, int opc)
+{
+    if (opc & P_DATA16) {
+        tcg_out8(s, 0x66);
+    }
+    if (opc & (P_EXT | P_EXT38)) {
+        tcg_out8(s, 0x0f);
+        if (opc & P_EXT38) {
+            tcg_out8(s, 0x38);
+        }
+    }
+    tcg_out8(s, opc);
+}
+/* Discard the register arguments to tcg_out_opc early, so as not to penalize
+   the 32-bit compilation paths.  This method works with all versions of gcc,
+   whereas relying on optimization may not be able to exclude them.  */
+#define tcg_out_opc(s, opc, r, rm, x)  (tcg_out_opc)(s, opc)
+#endif
+
+static void tcg_out_modrm(TCGContext *s, int opc, int r, int rm)
+{
+    tcg_out_opc(s, opc, r, rm, 0);
+    tcg_out8(s, 0xc0 | (LOWREGMASK(r) << 3) | LOWREGMASK(rm));
+}
+
+static void tcg_out_vex_modrm(TCGContext *s, int opc, int r, int v, int rm)
+{
+    int tmp;
+
+    if ((opc & (P_REXW | P_EXT | P_EXT38)) || (rm & 8)) {
+        /* Three byte VEX prefix.  */
+        tcg_out8(s, 0xc4);
+
+        /* VEX.m-mmmm */
+        if (opc & P_EXT38) {
+            tmp = 2;
+        } else if (opc & P_EXT) {
+            tmp = 1;
+        } else {
+            tcg_abort();
+        }
+        tmp |= 0x40;                       /* VEX.X */
+        tmp |= (r & 8 ? 0 : 0x80);         /* VEX.R */
+        tmp |= (rm & 8 ? 0 : 0x20);        /* VEX.B */
+        tcg_out8(s, tmp);
+
+        tmp = (opc & P_REXW ? 0x80 : 0);   /* VEX.W */
+    } else {
+        /* Two byte VEX prefix.  */
+        tcg_out8(s, 0xc5);
+
+        tmp = (r & 8 ? 0 : 0x80);          /* VEX.R */
+    }
+    /* VEX.pp */
+    if (opc & P_DATA16) {
+        tmp |= 1;                          /* 0x66 */
+    } else if (opc & P_SIMDF3) {
+        tmp |= 2;                          /* 0xf3 */
+    } else if (opc & P_SIMDF2) {
+        tmp |= 3;                          /* 0xf2 */
+    }
+    tmp |= (~v & 15) << 3;                 /* VEX.vvvv */
+    tcg_out8(s, tmp);
+    tcg_out8(s, opc);
+    tcg_out8(s, 0xc0 | (LOWREGMASK(r) << 3) | LOWREGMASK(rm));
+}
+
+/* Output an opcode with a full "rm + (index<<shift) + offset" address mode.
+   We handle either RM and INDEX missing with a negative value.  In 64-bit
+   mode for absolute addresses, ~RM is the size of the immediate operand
+   that will follow the instruction.  */
+
+static void tcg_out_modrm_sib_offset(TCGContext *s, int opc, int r, int rm,
+                                     int index, int shift, intptr_t offset)
+{
+    int mod, len;
+
+    if (index < 0 && rm < 0) {
+        if (TCG_TARGET_REG_BITS == 64) {
+            /* Try for a rip-relative addressing mode.  This has replaced
+               the 32-bit-mode absolute addressing encoding.  */
+            intptr_t pc = (intptr_t)s->code_ptr + 5 + ~rm;
+            intptr_t disp = offset - pc;
+            if (disp == (int32_t)disp) {
+                tcg_out_opc(s, opc, r, 0, 0);
+                tcg_out8(s, (LOWREGMASK(r) << 3) | 5);
+                tcg_out32(s, disp);
+                return;
+            }
+
+            /* Try for an absolute address encoding.  This requires the
+               use of the MODRM+SIB encoding and is therefore larger than
+               rip-relative addressing.  */
+            if (offset == (int32_t)offset) {
+                tcg_out_opc(s, opc, r, 0, 0);
+                tcg_out8(s, (LOWREGMASK(r) << 3) | 4);
+                tcg_out8(s, (4 << 3) | 5);
+                tcg_out32(s, offset);
+                return;
+            }
+
+            /* ??? The memory isn't directly addressable.  */
+            tcg_abort();
+        } else {
+            /* Absolute address.  */
+            tcg_out_opc(s, opc, r, 0, 0);
+            tcg_out8(s, (r << 3) | 5);
+            tcg_out32(s, offset);
+            return;
+        }
+    }
+
+    /* Find the length of the immediate addend.  Note that the encoding
+       that would be used for (%ebp) indicates absolute addressing.  */
+    if (rm < 0) {
+        mod = 0, len = 4, rm = 5;
+    } else if (offset == 0 && LOWREGMASK(rm) != TCG_REG_EBP) {
+        mod = 0, len = 0;
+    } else if (offset == (int8_t)offset) {
+        mod = 0x40, len = 1;
+    } else {
+        mod = 0x80, len = 4;
+    }
+
+    /* Use a single byte MODRM format if possible.  Note that the encoding
+       that would be used for %esp is the escape to the two byte form.  */
+    if (index < 0 && LOWREGMASK(rm) != TCG_REG_ESP) {
+        /* Single byte MODRM format.  */
+        tcg_out_opc(s, opc, r, rm, 0);
+        tcg_out8(s, mod | (LOWREGMASK(r) << 3) | LOWREGMASK(rm));
+    } else {
+        /* Two byte MODRM+SIB format.  */
+
+        /* Note that the encoding that would place %esp into the index
+           field indicates no index register.  In 64-bit mode, the REX.X
+           bit counts, so %r12 can be used as the index.  */
+        if (index < 0) {
+            index = 4;
+        } else {
+            assert(index != TCG_REG_ESP);
+        }
+
+        tcg_out_opc(s, opc, r, rm, index);
+        tcg_out8(s, mod | (LOWREGMASK(r) << 3) | 4);
+        tcg_out8(s, (shift << 6) | (LOWREGMASK(index) << 3) | LOWREGMASK(rm));
+    }
+
+    if (len == 1) {
+        tcg_out8(s, offset);
+    } else if (len == 4) {
+        tcg_out32(s, offset);
+    }
+}
+
+/* A simplification of the above with no index or shift.  */
+static inline void tcg_out_modrm_offset(TCGContext *s, int opc, int r,
+                                        int rm, intptr_t offset)
+{
+    tcg_out_modrm_sib_offset(s, opc, r, rm, -1, 0, offset);
+}
+
+/* Generate dest op= src.  Uses the same ARITH_* codes as tgen_arithi.  */
+static inline void tgen_arithr(TCGContext *s, int subop, int dest, int src)
+{
+    /* Propagate an opcode prefix, such as P_REXW.  */
+    int ext = subop & ~0x7;
+    subop &= 0x7;
+
+    tcg_out_modrm(s, OPC_ARITH_GvEv + (subop << 3) + ext, dest, src);
+}
+
+static inline void tcg_out_mov(TCGContext *s, TCGType type,
+                               TCGReg ret, TCGReg arg)
+{
+    if (arg != ret) {
+        int opc = OPC_MOVL_GvEv + (type == TCG_TYPE_I64 ? P_REXW : 0);
+        tcg_out_modrm(s, opc, ret, arg);
+    }
+}
+
+static void tcg_out_movi(TCGContext *s, TCGType type,
+                         TCGReg ret, tcg_target_long arg)
+{
+    tcg_target_long diff;
+
+    if (arg == 0) {
+        tgen_arithr(s, ARITH_XOR, ret, ret);
+        return;
+    }
+    if (arg == (uint32_t)arg || type == TCG_TYPE_I32) {
+        tcg_out_opc(s, OPC_MOVL_Iv + LOWREGMASK(ret), 0, ret, 0);
+        tcg_out32(s, arg);
+        return;
+    }
+    if (arg == (int32_t)arg) {
+        tcg_out_modrm(s, OPC_MOVL_EvIz + P_REXW, 0, ret);
+        tcg_out32(s, arg);
+        return;
+    }
+
+    /* Try a 7 byte pc-relative lea before the 10 byte movq.  */
+    diff = arg - ((uintptr_t)s->code_ptr + 7);
+    if (diff == (int32_t)diff) {
+        tcg_out_opc(s, OPC_LEA | P_REXW, ret, 0, 0);
+        tcg_out8(s, (LOWREGMASK(ret) << 3) | 5);
+        tcg_out32(s, diff);
+        return;
+    }
+
+    tcg_out_opc(s, OPC_MOVL_Iv + P_REXW + LOWREGMASK(ret), 0, ret, 0);
+    tcg_out64(s, arg);
+}
+
+static inline void tcg_out_pushi(TCGContext *s, tcg_target_long val)
+{
+    if (val == (int8_t)val) {
+        tcg_out_opc(s, OPC_PUSH_Ib, 0, 0, 0);
+        tcg_out8(s, val);
+    } else if (val == (int32_t)val) {
+        tcg_out_opc(s, OPC_PUSH_Iv, 0, 0, 0);
+        tcg_out32(s, val);
+    } else {
+        tcg_abort();
+    }
+}
+
+static inline void tcg_out_push(TCGContext *s, int reg)
+{
+    tcg_out_opc(s, OPC_PUSH_r32 + LOWREGMASK(reg), 0, reg, 0);
+}
+
+static inline void tcg_out_pop(TCGContext *s, int reg)
+{
+    tcg_out_opc(s, OPC_POP_r32 + LOWREGMASK(reg), 0, reg, 0);
+}
+
+static inline void tcg_out_ld(TCGContext *s, TCGType type, TCGReg ret,
+                              TCGReg arg1, intptr_t arg2)
+{
+    int opc = OPC_MOVL_GvEv + (type == TCG_TYPE_I64 ? P_REXW : 0);
+    tcg_out_modrm_offset(s, opc, ret, arg1, arg2);
+}
+
+static inline void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg,
+                              TCGReg arg1, intptr_t arg2)
+{
+    int opc = OPC_MOVL_EvGv + (type == TCG_TYPE_I64 ? P_REXW : 0);
+    tcg_out_modrm_offset(s, opc, arg, arg1, arg2);
+}
+
+static inline void tcg_out_sti(TCGContext *s, TCGType type, TCGReg base,
+                               tcg_target_long ofs, tcg_target_long val)
+{
+    int opc = OPC_MOVL_EvIz + (type == TCG_TYPE_I64 ? P_REXW : 0);
+    tcg_out_modrm_offset(s, opc, 0, base, ofs);
+    tcg_out32(s, val);
+}
+
+static void tcg_out_shifti(TCGContext *s, int subopc, int reg, int count)
+{
+    /* Propagate an opcode prefix, such as P_DATA16.  */
+    int ext = subopc & ~0x7;
+    subopc &= 0x7;
+
+    if (count == 1) {
+        tcg_out_modrm(s, OPC_SHIFT_1 + ext, subopc, reg);
+    } else {
+        tcg_out_modrm(s, OPC_SHIFT_Ib + ext, subopc, reg);
+        tcg_out8(s, count);
+    }
+}
+
+static inline void tcg_out_bswap32(TCGContext *s, int reg)
+{
+    tcg_out_opc(s, OPC_BSWAP + LOWREGMASK(reg), 0, reg, 0);
+}
+
+static inline void tcg_out_rolw_8(TCGContext *s, int reg)
+{
+    tcg_out_shifti(s, SHIFT_ROL + P_DATA16, reg, 8);
+}
+
+static inline void tcg_out_ext8u(TCGContext *s, int dest, int src)
+{
+    /* movzbl */
+    assert(src < 4 || TCG_TARGET_REG_BITS == 64);
+    tcg_out_modrm(s, OPC_MOVZBL + P_REXB_RM, dest, src);
+}
+
+static void tcg_out_ext8s(TCGContext *s, int dest, int src, int rexw)
+{
+    /* movsbl */
+    assert(src < 4 || TCG_TARGET_REG_BITS == 64);
+    tcg_out_modrm(s, OPC_MOVSBL + P_REXB_RM + rexw, dest, src);
+}
+
+static inline void tcg_out_ext16u(TCGContext *s, int dest, int src)
+{
+    /* movzwl */
+    tcg_out_modrm(s, OPC_MOVZWL, dest, src);
+}
+
+static inline void tcg_out_ext16s(TCGContext *s, int dest, int src, int rexw)
+{
+    /* movsw[lq] */
+    tcg_out_modrm(s, OPC_MOVSWL + rexw, dest, src);
+}
+
+static inline void tcg_out_ext32u(TCGContext *s, int dest, int src)
+{
+    /* 32-bit mov zero extends.  */
+    tcg_out_modrm(s, OPC_MOVL_GvEv, dest, src);
+}
+
+static inline void tcg_out_ext32s(TCGContext *s, int dest, int src)
+{
+    tcg_out_modrm(s, OPC_MOVSLQ, dest, src);
+}
+
+static inline void tcg_out_bswap64(TCGContext *s, int reg)
+{
+    tcg_out_opc(s, OPC_BSWAP + P_REXW + LOWREGMASK(reg), 0, reg, 0);
+}
+
+static void tgen_arithi(TCGContext *s, int c, int r0,
+                        tcg_target_long val, int cf)
+{
+    int rexw = 0;
+
+    if (TCG_TARGET_REG_BITS == 64) {
+        rexw = c & -8;
+        c &= 7;
+    }
+
+    /* ??? While INC is 2 bytes shorter than ADDL $1, they also induce
+       partial flags update stalls on Pentium4 and are not recommended
+       by current Intel optimization manuals.  */
+    if (!cf && (c == ARITH_ADD || c == ARITH_SUB) && (val == 1 || val == -1)) {
+        int is_inc = (c == ARITH_ADD) ^ (val < 0);
+        if (TCG_TARGET_REG_BITS == 64) {
+            /* The single-byte increment encodings are re-tasked as the
+               REX prefixes.  Use the MODRM encoding.  */
+            tcg_out_modrm(s, OPC_GRP5 + rexw,
+                          (is_inc ? EXT5_INC_Ev : EXT5_DEC_Ev), r0);
+        } else {
+            tcg_out8(s, (is_inc ? OPC_INC_r32 : OPC_DEC_r32) + r0);
+        }
+        return;
+    }
+
+    if (c == ARITH_AND) {
+        if (TCG_TARGET_REG_BITS == 64) {
+            if (val == 0xffffffffu) {
+                tcg_out_ext32u(s, r0, r0);
+                return;
+            }
+            if (val == (uint32_t)val) {
+                /* AND with no high bits set can use a 32-bit operation.  */
+                rexw = 0;
+            }
+        }
+        if (val == 0xffu && (r0 < 4 || TCG_TARGET_REG_BITS == 64)) {
+            tcg_out_ext8u(s, r0, r0);
+            return;
+        }
+        if (val == 0xffffu) {
+            tcg_out_ext16u(s, r0, r0);
+            return;
+        }
+    }
+
+    if (val == (int8_t)val) {
+        tcg_out_modrm(s, OPC_ARITH_EvIb + rexw, c, r0);
+        tcg_out8(s, val);
+        return;
+    }
+    if (rexw == 0 || val == (int32_t)val) {
+        tcg_out_modrm(s, OPC_ARITH_EvIz + rexw, c, r0);
+        tcg_out32(s, val);
+        return;
+    }
+
+    tcg_abort();
+}
+
+static void tcg_out_addi(TCGContext *s, int reg, tcg_target_long val)
+{
+    if (val != 0) {
+        tgen_arithi(s, ARITH_ADD + P_REXW, reg, val, 0);
+    }
+}
+
+/* Use SMALL != 0 to force a short forward branch.  */
+static void tcg_out_jxx(TCGContext *s, int opc, TCGLabel *l, int small)
+{
+    int32_t val, val1;
+
+    if (l->has_value) {
+        val = tcg_pcrel_diff(s, l->u.value_ptr);
+        val1 = val - 2;
+        if ((int8_t)val1 == val1) {
+            if (opc == -1) {
+                tcg_out8(s, OPC_JMP_short);
+            } else {
+                tcg_out8(s, OPC_JCC_short + opc);
+            }
+            tcg_out8(s, val1);
+        } else {
+            if (small) {
+                tcg_abort();
+            }
+            if (opc == -1) {
+                tcg_out8(s, OPC_JMP_long);
+                tcg_out32(s, val - 5);
+            } else {
+                tcg_out_opc(s, OPC_JCC_long + opc, 0, 0, 0);
+                tcg_out32(s, val - 6);
+            }
+        }
+    } else if (small) {
+        if (opc == -1) {
+            tcg_out8(s, OPC_JMP_short);
+        } else {
+            tcg_out8(s, OPC_JCC_short + opc);
+        }
+        tcg_out_reloc(s, s->code_ptr, R_386_PC8, l, -1);
+        s->code_ptr += 1;
+    } else {
+        if (opc == -1) {
+            tcg_out8(s, OPC_JMP_long);
+        } else {
+            tcg_out_opc(s, OPC_JCC_long + opc, 0, 0, 0);
+        }
+        tcg_out_reloc(s, s->code_ptr, R_386_PC32, l, -4);
+        s->code_ptr += 4;
+    }
+}
+
+static void tcg_out_cmp(TCGContext *s, TCGArg arg1, TCGArg arg2,
+                        int const_arg2, int rexw)
+{
+    if (const_arg2) {
+        if (arg2 == 0) {
+            /* test r, r */
+            tcg_out_modrm(s, OPC_TESTL + rexw, arg1, arg1);
+        } else {
+            tgen_arithi(s, ARITH_CMP + rexw, arg1, arg2, 0);
+        }
+    } else {
+        tgen_arithr(s, ARITH_CMP + rexw, arg1, arg2);
+    }
+}
+
+static void tcg_out_brcond32(TCGContext *s, TCGCond cond,
+                             TCGArg arg1, TCGArg arg2, int const_arg2,
+                             TCGLabel *label, int small)
+{
+    tcg_out_cmp(s, arg1, arg2, const_arg2, 0);
+    tcg_out_jxx(s, tcg_cond_to_jcc[cond], label, small);
+}
+
+#if TCG_TARGET_REG_BITS == 64
+static void tcg_out_brcond64(TCGContext *s, TCGCond cond,
+                             TCGArg arg1, TCGArg arg2, int const_arg2,
+                             TCGLabel *label, int small)
+{
+    tcg_out_cmp(s, arg1, arg2, const_arg2, P_REXW);
+    tcg_out_jxx(s, tcg_cond_to_jcc[cond], label, small);
+}
+#else
+/* XXX: we implement it at the target level to avoid having to
+   handle cross basic blocks temporaries */
+static void tcg_out_brcond2(TCGContext *s, const TCGArg *args,
+                            const int *const_args, int small)
+{
+    TCGLabel *label_next = gen_new_label();
+    TCGLabel *label_this = arg_label(args[5]);
+
+    switch(args[4]) {
+    case TCG_COND_EQ:
+        tcg_out_brcond32(s, TCG_COND_NE, args[0], args[2], const_args[2],
+                         label_next, 1);
+        tcg_out_brcond32(s, TCG_COND_EQ, args[1], args[3], const_args[3],
+                         label_this, small);
+        break;
+    case TCG_COND_NE:
+        tcg_out_brcond32(s, TCG_COND_NE, args[0], args[2], const_args[2],
+                         label_this, small);
+        tcg_out_brcond32(s, TCG_COND_NE, args[1], args[3], const_args[3],
+                         label_this, small);
+        break;
+    case TCG_COND_LT:
+        tcg_out_brcond32(s, TCG_COND_LT, args[1], args[3], const_args[3],
+                         label_this, small);
+        tcg_out_jxx(s, JCC_JNE, label_next, 1);
+        tcg_out_brcond32(s, TCG_COND_LTU, args[0], args[2], const_args[2],
+                         label_this, small);
+        break;
+    case TCG_COND_LE:
+        tcg_out_brcond32(s, TCG_COND_LT, args[1], args[3], const_args[3],
+                         label_this, small);
+        tcg_out_jxx(s, JCC_JNE, label_next, 1);
+        tcg_out_brcond32(s, TCG_COND_LEU, args[0], args[2], const_args[2],
+                         label_this, small);
+        break;
+    case TCG_COND_GT:
+        tcg_out_brcond32(s, TCG_COND_GT, args[1], args[3], const_args[3],
+                         label_this, small);
+        tcg_out_jxx(s, JCC_JNE, label_next, 1);
+        tcg_out_brcond32(s, TCG_COND_GTU, args[0], args[2], const_args[2],
+                         label_this, small);
+        break;
+    case TCG_COND_GE:
+        tcg_out_brcond32(s, TCG_COND_GT, args[1], args[3], const_args[3],
+                         label_this, small);
+        tcg_out_jxx(s, JCC_JNE, label_next, 1);
+        tcg_out_brcond32(s, TCG_COND_GEU, args[0], args[2], const_args[2],
+                         label_this, small);
+        break;
+    case TCG_COND_LTU:
+        tcg_out_brcond32(s, TCG_COND_LTU, args[1], args[3], const_args[3],
+                         label_this, small);
+        tcg_out_jxx(s, JCC_JNE, label_next, 1);
+        tcg_out_brcond32(s, TCG_COND_LTU, args[0], args[2], const_args[2],
+                         label_this, small);
+        break;
+    case TCG_COND_LEU:
+        tcg_out_brcond32(s, TCG_COND_LTU, args[1], args[3], const_args[3],
+                         label_this, small);
+        tcg_out_jxx(s, JCC_JNE, label_next, 1);
+        tcg_out_brcond32(s, TCG_COND_LEU, args[0], args[2], const_args[2],
+                         label_this, small);
+        break;
+    case TCG_COND_GTU:
+        tcg_out_brcond32(s, TCG_COND_GTU, args[1], args[3], const_args[3],
+                         label_this, small);
+        tcg_out_jxx(s, JCC_JNE, label_next, 1);
+        tcg_out_brcond32(s, TCG_COND_GTU, args[0], args[2], const_args[2],
+                         label_this, small);
+        break;
+    case TCG_COND_GEU:
+        tcg_out_brcond32(s, TCG_COND_GTU, args[1], args[3], const_args[3],
+                         label_this, small);
+        tcg_out_jxx(s, JCC_JNE, label_next, 1);
+        tcg_out_brcond32(s, TCG_COND_GEU, args[0], args[2], const_args[2],
+                         label_this, small);
+        break;
+    default:
+        tcg_abort();
+    }
+    tcg_out_label(s, label_next, s->code_ptr);
+}
+#endif
+
+static void tcg_out_setcond32(TCGContext *s, TCGCond cond, TCGArg dest,
+                              TCGArg arg1, TCGArg arg2, int const_arg2)
+{
+    tcg_out_cmp(s, arg1, arg2, const_arg2, 0);
+    tcg_out_modrm(s, OPC_SETCC | tcg_cond_to_jcc[cond], 0, dest);
+    tcg_out_ext8u(s, dest, dest);
+}
+
+#if TCG_TARGET_REG_BITS == 64
+static void tcg_out_setcond64(TCGContext *s, TCGCond cond, TCGArg dest,
+                              TCGArg arg1, TCGArg arg2, int const_arg2)
+{
+    tcg_out_cmp(s, arg1, arg2, const_arg2, P_REXW);
+    tcg_out_modrm(s, OPC_SETCC | tcg_cond_to_jcc[cond], 0, dest);
+    tcg_out_ext8u(s, dest, dest);
+}
+#else
+static void tcg_out_setcond2(TCGContext *s, const TCGArg *args,
+                             const int *const_args)
+{
+    TCGArg new_args[6];
+    TCGLabel *label_true, *label_over;
+
+    memcpy(new_args, args+1, 5*sizeof(TCGArg));
+
+    if (args[0] == args[1] || args[0] == args[2]
+        || (!const_args[3] && args[0] == args[3])
+        || (!const_args[4] && args[0] == args[4])) {
+        /* When the destination overlaps with one of the argument
+           registers, don't do anything tricky.  */
+        label_true = gen_new_label();
+        label_over = gen_new_label();
+
+        new_args[5] = label_arg(label_true);
+        tcg_out_brcond2(s, new_args, const_args+1, 1);
+
+        tcg_out_movi(s, TCG_TYPE_I32, args[0], 0);
+        tcg_out_jxx(s, JCC_JMP, label_over, 1);
+        tcg_out_label(s, label_true, s->code_ptr);
+
+        tcg_out_movi(s, TCG_TYPE_I32, args[0], 1);
+        tcg_out_label(s, label_over, s->code_ptr);
+    } else {
+        /* When the destination does not overlap one of the arguments,
+           clear the destination first, jump if cond false, and emit an
+           increment in the true case.  This results in smaller code.  */
+
+        tcg_out_movi(s, TCG_TYPE_I32, args[0], 0);
+
+        label_over = gen_new_label();
+        new_args[4] = tcg_invert_cond(new_args[4]);
+        new_args[5] = label_arg(label_over);
+        tcg_out_brcond2(s, new_args, const_args+1, 1);
+
+        tgen_arithi(s, ARITH_ADD, args[0], 1, 0);
+        tcg_out_label(s, label_over, s->code_ptr);
+    }
+}
+#endif
+
+static void tcg_out_movcond32(TCGContext *s, TCGCond cond, TCGArg dest,
+                              TCGArg c1, TCGArg c2, int const_c2,
+                              TCGArg v1)
+{
+    tcg_out_cmp(s, c1, c2, const_c2, 0);
+    if (have_cmov) {
+        tcg_out_modrm(s, OPC_CMOVCC | tcg_cond_to_jcc[cond], dest, v1);
+    } else {
+        TCGLabel *over = gen_new_label();
+        tcg_out_jxx(s, tcg_cond_to_jcc[tcg_invert_cond(cond)], over, 1);
+        tcg_out_mov(s, TCG_TYPE_I32, dest, v1);
+        tcg_out_label(s, over, s->code_ptr);
+    }
+}
+
+#if TCG_TARGET_REG_BITS == 64
+static void tcg_out_movcond64(TCGContext *s, TCGCond cond, TCGArg dest,
+                              TCGArg c1, TCGArg c2, int const_c2,
+                              TCGArg v1)
+{
+    tcg_out_cmp(s, c1, c2, const_c2, P_REXW);
+    tcg_out_modrm(s, OPC_CMOVCC | tcg_cond_to_jcc[cond] | P_REXW, dest, v1);
+}
+#endif
+
+static void tcg_out_branch(TCGContext *s, int call, tcg_insn_unit *dest)
+{
+    intptr_t disp = tcg_pcrel_diff(s, dest) - 5;
+
+    if (disp == (int32_t)disp) {
+        tcg_out_opc(s, call ? OPC_CALL_Jz : OPC_JMP_long, 0, 0, 0);
+        tcg_out32(s, disp);
+    } else {
+        tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R10, (uintptr_t)dest);
+        tcg_out_modrm(s, OPC_GRP5,
+                      call ? EXT5_CALLN_Ev : EXT5_JMPN_Ev, TCG_REG_R10);
+    }
+}
+
+static inline void tcg_out_call(TCGContext *s, tcg_insn_unit *dest)
+{
+    tcg_out_branch(s, 1, dest);
+}
+
+static void tcg_out_jmp(TCGContext *s, tcg_insn_unit *dest)
+{
+    tcg_out_branch(s, 0, dest);
+}
+
+#if defined(CONFIG_SOFTMMU)
+/* helper signature: helper_ret_ld_mmu(CPUState *env, target_ulong addr,
+ *                                     int mmu_idx, uintptr_t ra)
+ */
+static void * const qemu_ld_helpers[16] = {
+    [MO_UB]   = helper_ret_ldub_mmu,
+    [MO_LEUW] = helper_le_lduw_mmu,
+    [MO_LEUL] = helper_le_ldul_mmu,
+    [MO_LEQ]  = helper_le_ldq_mmu,
+    [MO_BEUW] = helper_be_lduw_mmu,
+    [MO_BEUL] = helper_be_ldul_mmu,
+    [MO_BEQ]  = helper_be_ldq_mmu,
+};
+
+/* helper signature: helper_ret_st_mmu(CPUState *env, target_ulong addr,
+ *                                     uintxx_t val, int mmu_idx, uintptr_t ra)
+ */
+static void * const qemu_st_helpers[16] = {
+    [MO_UB]   = helper_ret_stb_mmu,
+    [MO_LEUW] = helper_le_stw_mmu,
+    [MO_LEUL] = helper_le_stl_mmu,
+    [MO_LEQ]  = helper_le_stq_mmu,
+    [MO_BEUW] = helper_be_stw_mmu,
+    [MO_BEUL] = helper_be_stl_mmu,
+    [MO_BEQ]  = helper_be_stq_mmu,
+};
+
+/* Perform the TLB load and compare.
+
+   Inputs:
+   ADDRLO and ADDRHI contain the low and high part of the address.
+
+   MEM_INDEX and S_BITS are the memory context and log2 size of the load.
+
+   WHICH is the offset into the CPUTLBEntry structure of the slot to read.
+   This should be offsetof addr_read or addr_write.
+
+   Outputs:
+   LABEL_PTRS is filled with 1 (32-bit addresses) or 2 (64-bit addresses)
+   positions of the displacements of forward jumps to the TLB miss case.
+
+   Second argument register is loaded with the low part of the address.
+   In the TLB hit case, it has been adjusted as indicated by the TLB
+   and so is a host address.  In the TLB miss case, it continues to
+   hold a guest address.
+
+   First argument register is clobbered.  */
+
+static inline void tcg_out_tlb_load(TCGContext *s, TCGReg addrlo, TCGReg addrhi,
+                                    int mem_index, TCGMemOp opc,
+                                    tcg_insn_unit **label_ptr, int which)
+{
+    const TCGReg r0 = TCG_REG_L0;
+    const TCGReg r1 = TCG_REG_L1;
+    TCGType ttype = TCG_TYPE_I32;
+    TCGType tlbtype = TCG_TYPE_I32;
+    int trexw = 0, hrexw = 0, tlbrexw = 0;
+    int s_mask = (1 << (opc & MO_SIZE)) - 1;
+    bool aligned = (opc & MO_AMASK) == MO_ALIGN || s_mask == 0;
+
+    if (TCG_TARGET_REG_BITS == 64) {
+        if (TARGET_LONG_BITS == 64) {
+            ttype = TCG_TYPE_I64;
+            trexw = P_REXW;
+        }
+        if (TCG_TYPE_PTR == TCG_TYPE_I64) {
+            hrexw = P_REXW;
+            if (TARGET_PAGE_BITS + CPU_TLB_BITS > 32) {
+                tlbtype = TCG_TYPE_I64;
+                tlbrexw = P_REXW;
+            }
+        }
+    }
+
+    tcg_out_mov(s, tlbtype, r0, addrlo);
+    if (aligned) {
+        tcg_out_mov(s, ttype, r1, addrlo);
+    } else {
+        /* For unaligned access check that we don't cross pages using
+           the page address of the last byte.  */
+        tcg_out_modrm_offset(s, OPC_LEA + trexw, r1, addrlo, s_mask);
+    }
+
+    tcg_out_shifti(s, SHIFT_SHR + tlbrexw, r0,
+                   TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS);
+
+    tgen_arithi(s, ARITH_AND + trexw, r1,
+                TARGET_PAGE_MASK | (aligned ? s_mask : 0), 0);
+    tgen_arithi(s, ARITH_AND + tlbrexw, r0,
+                (CPU_TLB_SIZE - 1) << CPU_TLB_ENTRY_BITS, 0);
+
+    tcg_out_modrm_sib_offset(s, OPC_LEA + hrexw, r0, TCG_AREG0, r0, 0,
+                             offsetof(CPUArchState, tlb_table[mem_index][0])
+                             + which);
+
+    /* cmp 0(r0), r1 */
+    tcg_out_modrm_offset(s, OPC_CMP_GvEv + trexw, r1, r0, 0);
+
+    /* Prepare for both the fast path add of the tlb addend, and the slow
+       path function argument setup.  There are two cases worth note:
+       For 32-bit guest and x86_64 host, MOVL zero-extends the guest address
+       before the fastpath ADDQ below.  For 64-bit guest and x32 host, MOVQ
+       copies the entire guest address for the slow path, while truncation
+       for the 32-bit host happens with the fastpath ADDL below.  */
+    tcg_out_mov(s, ttype, r1, addrlo);
+
+    /* jne slow_path */
+    tcg_out_opc(s, OPC_JCC_long + JCC_JNE, 0, 0, 0);
+    label_ptr[0] = s->code_ptr;
+    s->code_ptr += 4;
+
+    if (TARGET_LONG_BITS > TCG_TARGET_REG_BITS) {
+        /* cmp 4(r0), addrhi */
+        tcg_out_modrm_offset(s, OPC_CMP_GvEv, addrhi, r0, 4);
+
+        /* jne slow_path */
+        tcg_out_opc(s, OPC_JCC_long + JCC_JNE, 0, 0, 0);
+        label_ptr[1] = s->code_ptr;
+        s->code_ptr += 4;
+    }
+
+    /* TLB Hit.  */
+
+    /* add addend(r0), r1 */
+    tcg_out_modrm_offset(s, OPC_ADD_GvEv + hrexw, r1, r0,
+                         offsetof(CPUTLBEntry, addend) - which);
+}
+
+/*
+ * Record the context of a call to the out of line helper code for the slow path
+ * for a load or store, so that we can later generate the correct helper code
+ */
+static void add_qemu_ldst_label(TCGContext *s, bool is_ld, TCGMemOpIdx oi,
+                                TCGReg datalo, TCGReg datahi,
+                                TCGReg addrlo, TCGReg addrhi,
+                                tcg_insn_unit *raddr,
+                                tcg_insn_unit **label_ptr)
+{
+    TCGLabelQemuLdst *label = new_ldst_label(s);
+
+    label->is_ld = is_ld;
+    label->oi = oi;
+    label->datalo_reg = datalo;
+    label->datahi_reg = datahi;
+    label->addrlo_reg = addrlo;
+    label->addrhi_reg = addrhi;
+    label->raddr = raddr;
+    label->label_ptr[0] = label_ptr[0];
+    if (TARGET_LONG_BITS > TCG_TARGET_REG_BITS) {
+        label->label_ptr[1] = label_ptr[1];
+    }
+}
+
+/*
+ * Generate code for the slow path for a load at the end of block
+ */
+static void tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
+{
+    TCGMemOpIdx oi = l->oi;
+    TCGMemOp opc = get_memop(oi);
+    TCGReg data_reg;
+    tcg_insn_unit **label_ptr = &l->label_ptr[0];
+
+    /* resolve label address */
+    tcg_patch32(label_ptr[0], s->code_ptr - label_ptr[0] - 4);
+    if (TARGET_LONG_BITS > TCG_TARGET_REG_BITS) {
+        tcg_patch32(label_ptr[1], s->code_ptr - label_ptr[1] - 4);
+    }
+
+    if (TCG_TARGET_REG_BITS == 32) {
+        int ofs = 0;
+
+        tcg_out_st(s, TCG_TYPE_PTR, TCG_AREG0, TCG_REG_ESP, ofs);
+        ofs += 4;
+
+        tcg_out_st(s, TCG_TYPE_I32, l->addrlo_reg, TCG_REG_ESP, ofs);
+        ofs += 4;
+
+        if (TARGET_LONG_BITS == 64) {
+            tcg_out_st(s, TCG_TYPE_I32, l->addrhi_reg, TCG_REG_ESP, ofs);
+            ofs += 4;
+        }
+
+        tcg_out_sti(s, TCG_TYPE_I32, TCG_REG_ESP, ofs, oi);
+        ofs += 4;
+
+        tcg_out_sti(s, TCG_TYPE_PTR, TCG_REG_ESP, ofs, (uintptr_t)l->raddr);
+    } else {
+        tcg_out_mov(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[0], TCG_AREG0);
+        /* The second argument is already loaded with addrlo.  */
+        tcg_out_movi(s, TCG_TYPE_I32, tcg_target_call_iarg_regs[2], oi);
+        tcg_out_movi(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[3],
+                     (uintptr_t)l->raddr);
+    }
+
+    tcg_out_call(s, qemu_ld_helpers[opc & (MO_BSWAP | MO_SIZE)]);
+
+    data_reg = l->datalo_reg;
+    switch (opc & MO_SSIZE) {
+    case MO_SB:
+        tcg_out_ext8s(s, data_reg, TCG_REG_EAX, P_REXW);
+        break;
+    case MO_SW:
+        tcg_out_ext16s(s, data_reg, TCG_REG_EAX, P_REXW);
+        break;
+#if TCG_TARGET_REG_BITS == 64
+    case MO_SL:
+        tcg_out_ext32s(s, data_reg, TCG_REG_EAX);
+        break;
+#endif
+    case MO_UB:
+    case MO_UW:
+        /* Note that the helpers have zero-extended to tcg_target_long.  */
+    case MO_UL:
+        tcg_out_mov(s, TCG_TYPE_I32, data_reg, TCG_REG_EAX);
+        break;
+    case MO_Q:
+        if (TCG_TARGET_REG_BITS == 64) {
+            tcg_out_mov(s, TCG_TYPE_I64, data_reg, TCG_REG_RAX);
+        } else if (data_reg == TCG_REG_EDX) {
+            /* xchg %edx, %eax */
+            tcg_out_opc(s, OPC_XCHG_ax_r32 + TCG_REG_EDX, 0, 0, 0);
+            tcg_out_mov(s, TCG_TYPE_I32, l->datahi_reg, TCG_REG_EAX);
+        } else {
+            tcg_out_mov(s, TCG_TYPE_I32, data_reg, TCG_REG_EAX);
+            tcg_out_mov(s, TCG_TYPE_I32, l->datahi_reg, TCG_REG_EDX);
+        }
+        break;
+    default:
+        tcg_abort();
+    }
+
+    /* Jump to the code corresponding to next IR of qemu_st */
+    tcg_out_jmp(s, l->raddr);
+}
+
+/*
+ * Generate code for the slow path for a store at the end of block
+ */
+static void tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
+{
+    TCGMemOpIdx oi = l->oi;
+    TCGMemOp opc = get_memop(oi);
+    TCGMemOp s_bits = opc & MO_SIZE;
+    tcg_insn_unit **label_ptr = &l->label_ptr[0];
+    TCGReg retaddr;
+
+    /* resolve label address */
+    tcg_patch32(label_ptr[0], s->code_ptr - label_ptr[0] - 4);
+    if (TARGET_LONG_BITS > TCG_TARGET_REG_BITS) {
+        tcg_patch32(label_ptr[1], s->code_ptr - label_ptr[1] - 4);
+    }
+
+    if (TCG_TARGET_REG_BITS == 32) {
+        int ofs = 0;
+
+        tcg_out_st(s, TCG_TYPE_PTR, TCG_AREG0, TCG_REG_ESP, ofs);
+        ofs += 4;
+
+        tcg_out_st(s, TCG_TYPE_I32, l->addrlo_reg, TCG_REG_ESP, ofs);
+        ofs += 4;
+
+        if (TARGET_LONG_BITS == 64) {
+            tcg_out_st(s, TCG_TYPE_I32, l->addrhi_reg, TCG_REG_ESP, ofs);
+            ofs += 4;
+        }
+
+        tcg_out_st(s, TCG_TYPE_I32, l->datalo_reg, TCG_REG_ESP, ofs);
+        ofs += 4;
+
+        if (s_bits == MO_64) {
+            tcg_out_st(s, TCG_TYPE_I32, l->datahi_reg, TCG_REG_ESP, ofs);
+            ofs += 4;
+        }
+
+        tcg_out_sti(s, TCG_TYPE_I32, TCG_REG_ESP, ofs, oi);
+        ofs += 4;
+
+        retaddr = TCG_REG_EAX;
+        tcg_out_movi(s, TCG_TYPE_PTR, retaddr, (uintptr_t)l->raddr);
+        tcg_out_st(s, TCG_TYPE_PTR, retaddr, TCG_REG_ESP, ofs);
+    } else {
+        tcg_out_mov(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[0], TCG_AREG0);
+        /* The second argument is already loaded with addrlo.  */
+        tcg_out_mov(s, (s_bits == MO_64 ? TCG_TYPE_I64 : TCG_TYPE_I32),
+                    tcg_target_call_iarg_regs[2], l->datalo_reg);
+        tcg_out_movi(s, TCG_TYPE_I32, tcg_target_call_iarg_regs[3], oi);
+
+        if (ARRAY_SIZE(tcg_target_call_iarg_regs) > 4) {
+            retaddr = tcg_target_call_iarg_regs[4];
+            tcg_out_movi(s, TCG_TYPE_PTR, retaddr, (uintptr_t)l->raddr);
+        } else {
+            retaddr = TCG_REG_RAX;
+            tcg_out_movi(s, TCG_TYPE_PTR, retaddr, (uintptr_t)l->raddr);
+            tcg_out_st(s, TCG_TYPE_PTR, retaddr, TCG_REG_ESP,
+                       TCG_TARGET_CALL_STACK_OFFSET);
+        }
+    }
+
+    /* "Tail call" to the helper, with the return address back inline.  */
+    tcg_out_push(s, retaddr);
+    tcg_out_jmp(s, qemu_st_helpers[opc & (MO_BSWAP | MO_SIZE)]);
+}
+#elif defined(__x86_64__) && defined(__linux__)
+# include <asm/prctl.h>
+# include <sys/prctl.h>
+
+int arch_prctl(int code, unsigned long addr);
+
+static int guest_base_flags;
+static inline void setup_guest_base_seg(void)
+{
+    if (arch_prctl(ARCH_SET_GS, guest_base) == 0) {
+        guest_base_flags = P_GS;
+    }
+}
+#else
+# define guest_base_flags 0
+static inline void setup_guest_base_seg(void) { }
+#endif /* SOFTMMU */
+
+static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
+                                   TCGReg base, int index, intptr_t ofs,
+                                   int seg, TCGMemOp memop)
+{
+    const TCGMemOp real_bswap = memop & MO_BSWAP;
+    TCGMemOp bswap = real_bswap;
+    int movop = OPC_MOVL_GvEv;
+
+    if (have_movbe && real_bswap) {
+        bswap = 0;
+        movop = OPC_MOVBE_GyMy;
+    }
+
+    switch (memop & MO_SSIZE) {
+    case MO_UB:
+        tcg_out_modrm_sib_offset(s, OPC_MOVZBL + seg, datalo,
+                                 base, index, 0, ofs);
+        break;
+    case MO_SB:
+        tcg_out_modrm_sib_offset(s, OPC_MOVSBL + P_REXW + seg, datalo,
+                                 base, index, 0, ofs);
+        break;
+    case MO_UW:
+        tcg_out_modrm_sib_offset(s, OPC_MOVZWL + seg, datalo,
+                                 base, index, 0, ofs);
+        if (real_bswap) {
+            tcg_out_rolw_8(s, datalo);
+        }
+        break;
+    case MO_SW:
+        if (real_bswap) {
+            if (have_movbe) {
+                tcg_out_modrm_sib_offset(s, OPC_MOVBE_GyMy + P_DATA16 + seg,
+                                         datalo, base, index, 0, ofs);
+            } else {
+                tcg_out_modrm_sib_offset(s, OPC_MOVZWL + seg, datalo,
+                                         base, index, 0, ofs);
+                tcg_out_rolw_8(s, datalo);
+            }
+            tcg_out_modrm(s, OPC_MOVSWL + P_REXW, datalo, datalo);
+        } else {
+            tcg_out_modrm_sib_offset(s, OPC_MOVSWL + P_REXW + seg,
+                                     datalo, base, index, 0, ofs);
+        }
+        break;
+    case MO_UL:
+        tcg_out_modrm_sib_offset(s, movop + seg, datalo, base, index, 0, ofs);
+        if (bswap) {
+            tcg_out_bswap32(s, datalo);
+        }
+        break;
+#if TCG_TARGET_REG_BITS == 64
+    case MO_SL:
+        if (real_bswap) {
+            tcg_out_modrm_sib_offset(s, movop + seg, datalo,
+                                     base, index, 0, ofs);
+            if (bswap) {
+                tcg_out_bswap32(s, datalo);
+            }
+            tcg_out_ext32s(s, datalo, datalo);
+        } else {
+            tcg_out_modrm_sib_offset(s, OPC_MOVSLQ + seg, datalo,
+                                     base, index, 0, ofs);
+        }
+        break;
+#endif
+    case MO_Q:
+        if (TCG_TARGET_REG_BITS == 64) {
+            tcg_out_modrm_sib_offset(s, movop + P_REXW + seg, datalo,
+                                     base, index, 0, ofs);
+            if (bswap) {
+                tcg_out_bswap64(s, datalo);
+            }
+        } else {
+            if (real_bswap) {
+                int t = datalo;
+                datalo = datahi;
+                datahi = t;
+            }
+            if (base != datalo) {
+                tcg_out_modrm_sib_offset(s, movop + seg, datalo,
+                                         base, index, 0, ofs);
+                tcg_out_modrm_sib_offset(s, movop + seg, datahi,
+                                         base, index, 0, ofs + 4);
+            } else {
+                tcg_out_modrm_sib_offset(s, movop + seg, datahi,
+                                         base, index, 0, ofs + 4);
+                tcg_out_modrm_sib_offset(s, movop + seg, datalo,
+                                         base, index, 0, ofs);
+            }
+            if (bswap) {
+                tcg_out_bswap32(s, datalo);
+                tcg_out_bswap32(s, datahi);
+            }
+        }
+        break;
+    default:
+        tcg_abort();
+    }
+}
+
+/* XXX: qemu_ld and qemu_st could be modified to clobber only EDX and
+   EAX. It will be useful once fixed registers globals are less
+   common. */
+static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, bool is64)
+{
+    TCGReg datalo, datahi, addrlo;
+    TCGReg addrhi __attribute__((unused));
+    TCGMemOpIdx oi;
+    TCGMemOp opc;
+#if defined(CONFIG_SOFTMMU)
+    int mem_index;
+    tcg_insn_unit *label_ptr[2];
+#endif
+
+    datalo = *args++;
+    datahi = (TCG_TARGET_REG_BITS == 32 && is64 ? *args++ : 0);
+    addrlo = *args++;
+    addrhi = (TARGET_LONG_BITS > TCG_TARGET_REG_BITS ? *args++ : 0);
+    oi = *args++;
+    opc = get_memop(oi);
+
+#if defined(CONFIG_SOFTMMU)
+    mem_index = get_mmuidx(oi);
+
+    tcg_out_tlb_load(s, addrlo, addrhi, mem_index, opc,
+                     label_ptr, offsetof(CPUTLBEntry, addr_read));
+
+    /* TLB Hit.  */
+    tcg_out_qemu_ld_direct(s, datalo, datahi, TCG_REG_L1, -1, 0, 0, opc);
+
+    /* Record the current context of a load into ldst label */
+    add_qemu_ldst_label(s, true, oi, datalo, datahi, addrlo, addrhi,
+                        s->code_ptr, label_ptr);
+#else
+    {
+        int32_t offset = guest_base;
+        TCGReg base = addrlo;
+        int index = -1;
+        int seg = 0;
+
+        /* For a 32-bit guest, the high 32 bits may contain garbage.
+           We can do this with the ADDR32 prefix if we're not using
+           a guest base, or when using segmentation.  Otherwise we
+           need to zero-extend manually.  */
+        if (guest_base == 0 || guest_base_flags) {
+            seg = guest_base_flags;
+            offset = 0;
+            if (TCG_TARGET_REG_BITS > TARGET_LONG_BITS) {
+                seg |= P_ADDR32;
+            }
+        } else if (TCG_TARGET_REG_BITS == 64) {
+            if (TARGET_LONG_BITS == 32) {
+                tcg_out_ext32u(s, TCG_REG_L0, base);
+                base = TCG_REG_L0;
+            }
+            if (offset != guest_base) {
+                tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_L1, guest_base);
+                index = TCG_REG_L1;
+                offset = 0;
+            }
+        }
+
+        tcg_out_qemu_ld_direct(s, datalo, datahi,
+                               base, index, offset, seg, opc);
+    }
+#endif
+}
+
+static void tcg_out_qemu_st_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
+                                   TCGReg base, intptr_t ofs, int seg,
+                                   TCGMemOp memop)
+{
+    /* ??? Ideally we wouldn't need a scratch register.  For user-only,
+       we could perform the bswap twice to restore the original value
+       instead of moving to the scratch.  But as it is, the L constraint
+       means that TCG_REG_L0 is definitely free here.  */
+    const TCGReg scratch = TCG_REG_L0;
+    const TCGMemOp real_bswap = memop & MO_BSWAP;
+    TCGMemOp bswap = real_bswap;
+    int movop = OPC_MOVL_EvGv;
+
+    if (have_movbe && real_bswap) {
+        bswap = 0;
+        movop = OPC_MOVBE_MyGy;
+    }
+
+    switch (memop & MO_SIZE) {
+    case MO_8:
+        /* In 32-bit mode, 8-bit stores can only happen from [abcd]x.
+           Use the scratch register if necessary.  */
+        if (TCG_TARGET_REG_BITS == 32 && datalo >= 4) {
+            tcg_out_mov(s, TCG_TYPE_I32, scratch, datalo);
+            datalo = scratch;
+        }
+        tcg_out_modrm_offset(s, OPC_MOVB_EvGv + P_REXB_R + seg,
+                             datalo, base, ofs);
+        break;
+    case MO_16:
+        if (bswap) {
+            tcg_out_mov(s, TCG_TYPE_I32, scratch, datalo);
+            tcg_out_rolw_8(s, scratch);
+            datalo = scratch;
+        }
+        tcg_out_modrm_offset(s, movop + P_DATA16 + seg, datalo, base, ofs);
+        break;
+    case MO_32:
+        if (bswap) {
+            tcg_out_mov(s, TCG_TYPE_I32, scratch, datalo);
+            tcg_out_bswap32(s, scratch);
+            datalo = scratch;
+        }
+        tcg_out_modrm_offset(s, movop + seg, datalo, base, ofs);
+        break;
+    case MO_64:
+        if (TCG_TARGET_REG_BITS == 64) {
+            if (bswap) {
+                tcg_out_mov(s, TCG_TYPE_I64, scratch, datalo);
+                tcg_out_bswap64(s, scratch);
+                datalo = scratch;
+            }
+            tcg_out_modrm_offset(s, movop + P_REXW + seg, datalo, base, ofs);
+        } else if (bswap) {
+            tcg_out_mov(s, TCG_TYPE_I32, scratch, datahi);
+            tcg_out_bswap32(s, scratch);
+            tcg_out_modrm_offset(s, OPC_MOVL_EvGv + seg, scratch, base, ofs);
+            tcg_out_mov(s, TCG_TYPE_I32, scratch, datalo);
+            tcg_out_bswap32(s, scratch);
+            tcg_out_modrm_offset(s, OPC_MOVL_EvGv + seg, scratch, base, ofs+4);
+        } else {
+            if (real_bswap) {
+                int t = datalo;
+                datalo = datahi;
+                datahi = t;
+            }
+            tcg_out_modrm_offset(s, movop + seg, datalo, base, ofs);
+            tcg_out_modrm_offset(s, movop + seg, datahi, base, ofs+4);
+        }
+        break;
+    default:
+        tcg_abort();
+    }
+}
+
+static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is64)
+{
+    TCGReg datalo, datahi, addrlo;
+    TCGReg addrhi __attribute__((unused));
+    TCGMemOpIdx oi;
+    TCGMemOp opc;
+#if defined(CONFIG_SOFTMMU)
+    int mem_index;
+    tcg_insn_unit *label_ptr[2];
+#endif
+
+    datalo = *args++;
+    datahi = (TCG_TARGET_REG_BITS == 32 && is64 ? *args++ : 0);
+    addrlo = *args++;
+    addrhi = (TARGET_LONG_BITS > TCG_TARGET_REG_BITS ? *args++ : 0);
+    oi = *args++;
+    opc = get_memop(oi);
+
+#if defined(CONFIG_SOFTMMU)
+    mem_index = get_mmuidx(oi);
+
+    tcg_out_tlb_load(s, addrlo, addrhi, mem_index, opc,
+                     label_ptr, offsetof(CPUTLBEntry, addr_write));
+
+    /* TLB Hit.  */
+    tcg_out_qemu_st_direct(s, datalo, datahi, TCG_REG_L1, 0, 0, opc);
+
+    /* Record the current context of a store into ldst label */
+    add_qemu_ldst_label(s, false, oi, datalo, datahi, addrlo, addrhi,
+                        s->code_ptr, label_ptr);
+#else
+    {
+        int32_t offset = guest_base;
+        TCGReg base = addrlo;
+        int seg = 0;
+
+        /* See comment in tcg_out_qemu_ld re zero-extension of addrlo.  */
+        if (guest_base == 0 || guest_base_flags) {
+            seg = guest_base_flags;
+            offset = 0;
+            if (TCG_TARGET_REG_BITS > TARGET_LONG_BITS) {
+                seg |= P_ADDR32;
+            }
+        } else if (TCG_TARGET_REG_BITS == 64) {
+            /* ??? Note that we can't use the same SIB addressing scheme
+               as for loads, since we require L0 free for bswap.  */
+            if (offset != guest_base) {
+                if (TARGET_LONG_BITS == 32) {
+                    tcg_out_ext32u(s, TCG_REG_L0, base);
+                    base = TCG_REG_L0;
+                }
+                tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_L1, guest_base);
+                tgen_arithr(s, ARITH_ADD + P_REXW, TCG_REG_L1, base);
+                base = TCG_REG_L1;
+                offset = 0;
+            } else if (TARGET_LONG_BITS == 32) {
+                tcg_out_ext32u(s, TCG_REG_L1, base);
+                base = TCG_REG_L1;
+            }
+        }
+
+        tcg_out_qemu_st_direct(s, datalo, datahi, base, offset, seg, opc);
+    }
+#endif
+}
+
+static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
+                              const TCGArg *args, const int *const_args)
+{
+    int c, vexop, rexw = 0;
+
+#if TCG_TARGET_REG_BITS == 64
+# define OP_32_64(x) \
+        case glue(glue(INDEX_op_, x), _i64): \
+            rexw = P_REXW; /* FALLTHRU */    \
+        case glue(glue(INDEX_op_, x), _i32)
+#else
+# define OP_32_64(x) \
+        case glue(glue(INDEX_op_, x), _i32)
+#endif
+
+    switch(opc) {
+    case INDEX_op_exit_tb:
+        tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_EAX, args[0]);
+        tcg_out_jmp(s, tb_ret_addr);
+        break;
+    case INDEX_op_goto_tb:
+        if (s->tb_jmp_offset) {
+            /* direct jump method */
+            tcg_out8(s, OPC_JMP_long); /* jmp im */
+            s->tb_jmp_offset[args[0]] = tcg_current_code_size(s);
+            tcg_out32(s, 0);
+        } else {
+            /* indirect jump method */
+            tcg_out_modrm_offset(s, OPC_GRP5, EXT5_JMPN_Ev, -1,
+                                 (intptr_t)(s->tb_next + args[0]));
+        }
+        s->tb_next_offset[args[0]] = tcg_current_code_size(s);
+        break;
+    case INDEX_op_br:
+        tcg_out_jxx(s, JCC_JMP, arg_label(args[0]), 0);
+        break;
+    OP_32_64(ld8u):
+        /* Note that we can ignore REXW for the zero-extend to 64-bit.  */
+        tcg_out_modrm_offset(s, OPC_MOVZBL, args[0], args[1], args[2]);
+        break;
+    OP_32_64(ld8s):
+        tcg_out_modrm_offset(s, OPC_MOVSBL + rexw, args[0], args[1], args[2]);
+        break;
+    OP_32_64(ld16u):
+        /* Note that we can ignore REXW for the zero-extend to 64-bit.  */
+        tcg_out_modrm_offset(s, OPC_MOVZWL, args[0], args[1], args[2]);
+        break;
+    OP_32_64(ld16s):
+        tcg_out_modrm_offset(s, OPC_MOVSWL + rexw, args[0], args[1], args[2]);
+        break;
+#if TCG_TARGET_REG_BITS == 64
+    case INDEX_op_ld32u_i64:
+#endif
+    case INDEX_op_ld_i32:
+        tcg_out_ld(s, TCG_TYPE_I32, args[0], args[1], args[2]);
+        break;
+
+    OP_32_64(st8):
+        if (const_args[0]) {
+            tcg_out_modrm_offset(s, OPC_MOVB_EvIz,
+                                 0, args[1], args[2]);
+            tcg_out8(s, args[0]);
+        } else {
+            tcg_out_modrm_offset(s, OPC_MOVB_EvGv | P_REXB_R,
+                                 args[0], args[1], args[2]);
+        }
+        break;
+    OP_32_64(st16):
+        if (const_args[0]) {
+            tcg_out_modrm_offset(s, OPC_MOVL_EvIz | P_DATA16,
+                                 0, args[1], args[2]);
+            tcg_out16(s, args[0]);
+        } else {
+            tcg_out_modrm_offset(s, OPC_MOVL_EvGv | P_DATA16,
+                                 args[0], args[1], args[2]);
+        }
+        break;
+#if TCG_TARGET_REG_BITS == 64
+    case INDEX_op_st32_i64:
+#endif
+    case INDEX_op_st_i32:
+        if (const_args[0]) {
+            tcg_out_modrm_offset(s, OPC_MOVL_EvIz, 0, args[1], args[2]);
+            tcg_out32(s, args[0]);
+        } else {
+            tcg_out_st(s, TCG_TYPE_I32, args[0], args[1], args[2]);
+        }
+        break;
+
+    OP_32_64(add):
+        /* For 3-operand addition, use LEA.  */
+        if (args[0] != args[1]) {
+            TCGArg a0 = args[0], a1 = args[1], a2 = args[2], c3 = 0;
+
+            if (const_args[2]) {
+                c3 = a2, a2 = -1;
+            } else if (a0 == a2) {
+                /* Watch out for dest = src + dest, since we've removed
+                   the matching constraint on the add.  */
+                tgen_arithr(s, ARITH_ADD + rexw, a0, a1);
+                break;
+            }
+
+            tcg_out_modrm_sib_offset(s, OPC_LEA + rexw, a0, a1, a2, 0, c3);
+            break;
+        }
+        c = ARITH_ADD;
+        goto gen_arith;
+    OP_32_64(sub):
+        c = ARITH_SUB;
+        goto gen_arith;
+    OP_32_64(and):
+        c = ARITH_AND;
+        goto gen_arith;
+    OP_32_64(or):
+        c = ARITH_OR;
+        goto gen_arith;
+    OP_32_64(xor):
+        c = ARITH_XOR;
+        goto gen_arith;
+    gen_arith:
+        if (const_args[2]) {
+            tgen_arithi(s, c + rexw, args[0], args[2], 0);
+        } else {
+            tgen_arithr(s, c + rexw, args[0], args[2]);
+        }
+        break;
+
+    OP_32_64(andc):
+        if (const_args[2]) {
+            tcg_out_mov(s, rexw ? TCG_TYPE_I64 : TCG_TYPE_I32,
+                        args[0], args[1]);
+            tgen_arithi(s, ARITH_AND + rexw, args[0], ~args[2], 0);
+        } else {
+            tcg_out_vex_modrm(s, OPC_ANDN + rexw, args[0], args[2], args[1]);
+        }
+        break;
+
+    OP_32_64(mul):
+        if (const_args[2]) {
+            int32_t val;
+            val = args[2];
+            if (val == (int8_t)val) {
+                tcg_out_modrm(s, OPC_IMUL_GvEvIb + rexw, args[0], args[0]);
+                tcg_out8(s, val);
+            } else {
+                tcg_out_modrm(s, OPC_IMUL_GvEvIz + rexw, args[0], args[0]);
+                tcg_out32(s, val);
+            }
+        } else {
+            tcg_out_modrm(s, OPC_IMUL_GvEv + rexw, args[0], args[2]);
+        }
+        break;
+
+    OP_32_64(div2):
+        tcg_out_modrm(s, OPC_GRP3_Ev + rexw, EXT3_IDIV, args[4]);
+        break;
+    OP_32_64(divu2):
+        tcg_out_modrm(s, OPC_GRP3_Ev + rexw, EXT3_DIV, args[4]);
+        break;
+
+    OP_32_64(shl):
+        c = SHIFT_SHL;
+        vexop = OPC_SHLX;
+        goto gen_shift_maybe_vex;
+    OP_32_64(shr):
+        c = SHIFT_SHR;
+        vexop = OPC_SHRX;
+        goto gen_shift_maybe_vex;
+    OP_32_64(sar):
+        c = SHIFT_SAR;
+        vexop = OPC_SARX;
+        goto gen_shift_maybe_vex;
+    OP_32_64(rotl):
+        c = SHIFT_ROL;
+        goto gen_shift;
+    OP_32_64(rotr):
+        c = SHIFT_ROR;
+        goto gen_shift;
+    gen_shift_maybe_vex:
+        if (have_bmi2 && !const_args[2]) {
+            tcg_out_vex_modrm(s, vexop + rexw, args[0], args[2], args[1]);
+            break;
+        }
+        /* FALLTHRU */
+    gen_shift:
+        if (const_args[2]) {
+            tcg_out_shifti(s, c + rexw, args[0], args[2]);
+        } else {
+            tcg_out_modrm(s, OPC_SHIFT_cl + rexw, c, args[0]);
+        }
+        break;
+
+    case INDEX_op_brcond_i32:
+        tcg_out_brcond32(s, args[2], args[0], args[1], const_args[1],
+                         arg_label(args[3]), 0);
+        break;
+    case INDEX_op_setcond_i32:
+        tcg_out_setcond32(s, args[3], args[0], args[1],
+                          args[2], const_args[2]);
+        break;
+    case INDEX_op_movcond_i32:
+        tcg_out_movcond32(s, args[5], args[0], args[1],
+                          args[2], const_args[2], args[3]);
+        break;
+
+    OP_32_64(bswap16):
+        tcg_out_rolw_8(s, args[0]);
+        break;
+    OP_32_64(bswap32):
+        tcg_out_bswap32(s, args[0]);
+        break;
+
+    OP_32_64(neg):
+        tcg_out_modrm(s, OPC_GRP3_Ev + rexw, EXT3_NEG, args[0]);
+        break;
+    OP_32_64(not):
+        tcg_out_modrm(s, OPC_GRP3_Ev + rexw, EXT3_NOT, args[0]);
+        break;
+
+    OP_32_64(ext8s):
+        tcg_out_ext8s(s, args[0], args[1], rexw);
+        break;
+    OP_32_64(ext16s):
+        tcg_out_ext16s(s, args[0], args[1], rexw);
+        break;
+    OP_32_64(ext8u):
+        tcg_out_ext8u(s, args[0], args[1]);
+        break;
+    OP_32_64(ext16u):
+        tcg_out_ext16u(s, args[0], args[1]);
+        break;
+
+    case INDEX_op_qemu_ld_i32:
+        tcg_out_qemu_ld(s, args, 0);
+        break;
+    case INDEX_op_qemu_ld_i64:
+        tcg_out_qemu_ld(s, args, 1);
+        break;
+    case INDEX_op_qemu_st_i32:
+        tcg_out_qemu_st(s, args, 0);
+        break;
+    case INDEX_op_qemu_st_i64:
+        tcg_out_qemu_st(s, args, 1);
+        break;
+
+    OP_32_64(mulu2):
+        tcg_out_modrm(s, OPC_GRP3_Ev + rexw, EXT3_MUL, args[3]);
+        break;
+    OP_32_64(muls2):
+        tcg_out_modrm(s, OPC_GRP3_Ev + rexw, EXT3_IMUL, args[3]);
+        break;
+    OP_32_64(add2):
+        if (const_args[4]) {
+            tgen_arithi(s, ARITH_ADD + rexw, args[0], args[4], 1);
+        } else {
+            tgen_arithr(s, ARITH_ADD + rexw, args[0], args[4]);
+        }
+        if (const_args[5]) {
+            tgen_arithi(s, ARITH_ADC + rexw, args[1], args[5], 1);
+        } else {
+            tgen_arithr(s, ARITH_ADC + rexw, args[1], args[5]);
+        }
+        break;
+    OP_32_64(sub2):
+        if (const_args[4]) {
+            tgen_arithi(s, ARITH_SUB + rexw, args[0], args[4], 1);
+        } else {
+            tgen_arithr(s, ARITH_SUB + rexw, args[0], args[4]);
+        }
+        if (const_args[5]) {
+            tgen_arithi(s, ARITH_SBB + rexw, args[1], args[5], 1);
+        } else {
+            tgen_arithr(s, ARITH_SBB + rexw, args[1], args[5]);
+        }
+        break;
+
+#if TCG_TARGET_REG_BITS == 32
+    case INDEX_op_brcond2_i32:
+        tcg_out_brcond2(s, args, const_args, 0);
+        break;
+    case INDEX_op_setcond2_i32:
+        tcg_out_setcond2(s, args, const_args);
+        break;
+#else /* TCG_TARGET_REG_BITS == 64 */
+    case INDEX_op_ld32s_i64:
+        tcg_out_modrm_offset(s, OPC_MOVSLQ, args[0], args[1], args[2]);
+        break;
+    case INDEX_op_ld_i64:
+        tcg_out_ld(s, TCG_TYPE_I64, args[0], args[1], args[2]);
+        break;
+    case INDEX_op_st_i64:
+        if (const_args[0]) {
+            tcg_out_modrm_offset(s, OPC_MOVL_EvIz | P_REXW,
+                                 0, args[1], args[2]);
+            tcg_out32(s, args[0]);
+        } else {
+            tcg_out_st(s, TCG_TYPE_I64, args[0], args[1], args[2]);
+        }
+        break;
+
+    case INDEX_op_brcond_i64:
+        tcg_out_brcond64(s, args[2], args[0], args[1], const_args[1],
+                         arg_label(args[3]), 0);
+        break;
+    case INDEX_op_setcond_i64:
+        tcg_out_setcond64(s, args[3], args[0], args[1],
+                          args[2], const_args[2]);
+        break;
+    case INDEX_op_movcond_i64:
+        tcg_out_movcond64(s, args[5], args[0], args[1],
+                          args[2], const_args[2], args[3]);
+        break;
+
+    case INDEX_op_bswap64_i64:
+        tcg_out_bswap64(s, args[0]);
+        break;
+    case INDEX_op_extu_i32_i64:
+    case INDEX_op_ext32u_i64:
+        tcg_out_ext32u(s, args[0], args[1]);
+        break;
+    case INDEX_op_ext_i32_i64:
+    case INDEX_op_ext32s_i64:
+        tcg_out_ext32s(s, args[0], args[1]);
+        break;
+#endif
+
+    OP_32_64(deposit):
+        if (args[3] == 0 && args[4] == 8) {
+            /* load bits 0..7 */
+            tcg_out_modrm(s, OPC_MOVB_EvGv | P_REXB_R | P_REXB_RM,
+                          args[2], args[0]);
+        } else if (args[3] == 8 && args[4] == 8) {
+            /* load bits 8..15 */
+            tcg_out_modrm(s, OPC_MOVB_EvGv, args[2], args[0] + 4);
+        } else if (args[3] == 0 && args[4] == 16) {
+            /* load bits 0..15 */
+            tcg_out_modrm(s, OPC_MOVL_EvGv | P_DATA16, args[2], args[0]);
+        } else {
+            tcg_abort();
+        }
+        break;
+
+    case INDEX_op_mov_i32:  /* Always emitted via tcg_out_mov.  */
+    case INDEX_op_mov_i64:
+    case INDEX_op_movi_i32: /* Always emitted via tcg_out_movi.  */
+    case INDEX_op_movi_i64:
+    case INDEX_op_call:     /* Always emitted via tcg_out_call.  */
+    default:
+        tcg_abort();
+    }
+
+#undef OP_32_64
+}
+
+static const TCGTargetOpDef x86_op_defs[] = {
+    { INDEX_op_exit_tb, { } },
+    { INDEX_op_goto_tb, { } },
+    { INDEX_op_br, { } },
+    { INDEX_op_ld8u_i32, { "r", "r" } },
+    { INDEX_op_ld8s_i32, { "r", "r" } },
+    { INDEX_op_ld16u_i32, { "r", "r" } },
+    { INDEX_op_ld16s_i32, { "r", "r" } },
+    { INDEX_op_ld_i32, { "r", "r" } },
+    { INDEX_op_st8_i32, { "qi", "r" } },
+    { INDEX_op_st16_i32, { "ri", "r" } },
+    { INDEX_op_st_i32, { "ri", "r" } },
+
+    { INDEX_op_add_i32, { "r", "r", "ri" } },
+    { INDEX_op_sub_i32, { "r", "0", "ri" } },
+    { INDEX_op_mul_i32, { "r", "0", "ri" } },
+    { INDEX_op_div2_i32, { "a", "d", "0", "1", "r" } },
+    { INDEX_op_divu2_i32, { "a", "d", "0", "1", "r" } },
+    { INDEX_op_and_i32, { "r", "0", "ri" } },
+    { INDEX_op_or_i32, { "r", "0", "ri" } },
+    { INDEX_op_xor_i32, { "r", "0", "ri" } },
+    { INDEX_op_andc_i32, { "r", "r", "ri" } },
+
+    { INDEX_op_shl_i32, { "r", "0", "Ci" } },
+    { INDEX_op_shr_i32, { "r", "0", "Ci" } },
+    { INDEX_op_sar_i32, { "r", "0", "Ci" } },
+    { INDEX_op_rotl_i32, { "r", "0", "ci" } },
+    { INDEX_op_rotr_i32, { "r", "0", "ci" } },
+
+    { INDEX_op_brcond_i32, { "r", "ri" } },
+
+    { INDEX_op_bswap16_i32, { "r", "0" } },
+    { INDEX_op_bswap32_i32, { "r", "0" } },
+
+    { INDEX_op_neg_i32, { "r", "0" } },
+
+    { INDEX_op_not_i32, { "r", "0" } },
+
+    { INDEX_op_ext8s_i32, { "r", "q" } },
+    { INDEX_op_ext16s_i32, { "r", "r" } },
+    { INDEX_op_ext8u_i32, { "r", "q" } },
+    { INDEX_op_ext16u_i32, { "r", "r" } },
+
+    { INDEX_op_setcond_i32, { "q", "r", "ri" } },
+
+    { INDEX_op_deposit_i32, { "Q", "0", "Q" } },
+    { INDEX_op_movcond_i32, { "r", "r", "ri", "r", "0" } },
+
+    { INDEX_op_mulu2_i32, { "a", "d", "a", "r" } },
+    { INDEX_op_muls2_i32, { "a", "d", "a", "r" } },
+    { INDEX_op_add2_i32, { "r", "r", "0", "1", "ri", "ri" } },
+    { INDEX_op_sub2_i32, { "r", "r", "0", "1", "ri", "ri" } },
+
+#if TCG_TARGET_REG_BITS == 32
+    { INDEX_op_brcond2_i32, { "r", "r", "ri", "ri" } },
+    { INDEX_op_setcond2_i32, { "r", "r", "r", "ri", "ri" } },
+#else
+    { INDEX_op_ld8u_i64, { "r", "r" } },
+    { INDEX_op_ld8s_i64, { "r", "r" } },
+    { INDEX_op_ld16u_i64, { "r", "r" } },
+    { INDEX_op_ld16s_i64, { "r", "r" } },
+    { INDEX_op_ld32u_i64, { "r", "r" } },
+    { INDEX_op_ld32s_i64, { "r", "r" } },
+    { INDEX_op_ld_i64, { "r", "r" } },
+    { INDEX_op_st8_i64, { "ri", "r" } },
+    { INDEX_op_st16_i64, { "ri", "r" } },
+    { INDEX_op_st32_i64, { "ri", "r" } },
+    { INDEX_op_st_i64, { "re", "r" } },
+
+    { INDEX_op_add_i64, { "r", "r", "re" } },
+    { INDEX_op_mul_i64, { "r", "0", "re" } },
+    { INDEX_op_div2_i64, { "a", "d", "0", "1", "r" } },
+    { INDEX_op_divu2_i64, { "a", "d", "0", "1", "r" } },
+    { INDEX_op_sub_i64, { "r", "0", "re" } },
+    { INDEX_op_and_i64, { "r", "0", "reZ" } },
+    { INDEX_op_or_i64, { "r", "0", "re" } },
+    { INDEX_op_xor_i64, { "r", "0", "re" } },
+    { INDEX_op_andc_i64, { "r", "r", "rI" } },
+
+    { INDEX_op_shl_i64, { "r", "0", "Ci" } },
+    { INDEX_op_shr_i64, { "r", "0", "Ci" } },
+    { INDEX_op_sar_i64, { "r", "0", "Ci" } },
+    { INDEX_op_rotl_i64, { "r", "0", "ci" } },
+    { INDEX_op_rotr_i64, { "r", "0", "ci" } },
+
+    { INDEX_op_brcond_i64, { "r", "re" } },
+    { INDEX_op_setcond_i64, { "r", "r", "re" } },
+
+    { INDEX_op_bswap16_i64, { "r", "0" } },
+    { INDEX_op_bswap32_i64, { "r", "0" } },
+    { INDEX_op_bswap64_i64, { "r", "0" } },
+    { INDEX_op_neg_i64, { "r", "0" } },
+    { INDEX_op_not_i64, { "r", "0" } },
+
+    { INDEX_op_ext8s_i64, { "r", "r" } },
+    { INDEX_op_ext16s_i64, { "r", "r" } },
+    { INDEX_op_ext32s_i64, { "r", "r" } },
+    { INDEX_op_ext8u_i64, { "r", "r" } },
+    { INDEX_op_ext16u_i64, { "r", "r" } },
+    { INDEX_op_ext32u_i64, { "r", "r" } },
+
+    { INDEX_op_ext_i32_i64, { "r", "r" } },
+    { INDEX_op_extu_i32_i64, { "r", "r" } },
+
+    { INDEX_op_deposit_i64, { "Q", "0", "Q" } },
+    { INDEX_op_movcond_i64, { "r", "r", "re", "r", "0" } },
+
+    { INDEX_op_mulu2_i64, { "a", "d", "a", "r" } },
+    { INDEX_op_muls2_i64, { "a", "d", "a", "r" } },
+    { INDEX_op_add2_i64, { "r", "r", "0", "1", "re", "re" } },
+    { INDEX_op_sub2_i64, { "r", "r", "0", "1", "re", "re" } },
+#endif
+
+#if TCG_TARGET_REG_BITS == 64
+    { INDEX_op_qemu_ld_i32, { "r", "L" } },
+    { INDEX_op_qemu_st_i32, { "L", "L" } },
+    { INDEX_op_qemu_ld_i64, { "r", "L" } },
+    { INDEX_op_qemu_st_i64, { "L", "L" } },
+#elif TARGET_LONG_BITS <= TCG_TARGET_REG_BITS
+    { INDEX_op_qemu_ld_i32, { "r", "L" } },
+    { INDEX_op_qemu_st_i32, { "L", "L" } },
+    { INDEX_op_qemu_ld_i64, { "r", "r", "L" } },
+    { INDEX_op_qemu_st_i64, { "L", "L", "L" } },
+#else
+    { INDEX_op_qemu_ld_i32, { "r", "L", "L" } },
+    { INDEX_op_qemu_st_i32, { "L", "L", "L" } },
+    { INDEX_op_qemu_ld_i64, { "r", "r", "L", "L" } },
+    { INDEX_op_qemu_st_i64, { "L", "L", "L", "L" } },
+#endif
+    { -1 },
+};
+
+static int tcg_target_callee_save_regs[] = {
+#if TCG_TARGET_REG_BITS == 64
+    TCG_REG_RBP,
+    TCG_REG_RBX,
+#if defined(_WIN64)
+    TCG_REG_RDI,
+    TCG_REG_RSI,
+#endif
+    TCG_REG_R12,
+    TCG_REG_R13,
+    TCG_REG_R14, /* Currently used for the global env. */
+    TCG_REG_R15,
+#else
+    TCG_REG_EBP, /* Currently used for the global env. */
+    TCG_REG_EBX,
+    TCG_REG_ESI,
+    TCG_REG_EDI,
+#endif
+};
+
+/* Compute frame size via macros, to share between tcg_target_qemu_prologue
+   and tcg_register_jit.  */
+
+#define PUSH_SIZE \
+    ((1 + ARRAY_SIZE(tcg_target_callee_save_regs)) \
+     * (TCG_TARGET_REG_BITS / 8))
+
+#define FRAME_SIZE \
+    ((PUSH_SIZE \
+      + TCG_STATIC_CALL_ARGS_SIZE \
+      + CPU_TEMP_BUF_NLONGS * sizeof(long) \
+      + TCG_TARGET_STACK_ALIGN - 1) \
+     & ~(TCG_TARGET_STACK_ALIGN - 1))
+
+/* Generate global QEMU prologue and epilogue code */
+static void tcg_target_qemu_prologue(TCGContext *s)
+{
+    int i, stack_addend;
+
+    /* TB prologue */
+
+    /* Reserve some stack space, also for TCG temps.  */
+    stack_addend = FRAME_SIZE - PUSH_SIZE;
+    tcg_set_frame(s, TCG_REG_CALL_STACK, TCG_STATIC_CALL_ARGS_SIZE,
+                  CPU_TEMP_BUF_NLONGS * sizeof(long));
+
+    /* Save all callee saved registers.  */
+    for (i = 0; i < ARRAY_SIZE(tcg_target_callee_save_regs); i++) {
+        tcg_out_push(s, tcg_target_callee_save_regs[i]);
+    }
+
+#if TCG_TARGET_REG_BITS == 32
+    tcg_out_ld(s, TCG_TYPE_PTR, TCG_AREG0, TCG_REG_ESP,
+               (ARRAY_SIZE(tcg_target_callee_save_regs) + 1) * 4);
+    tcg_out_addi(s, TCG_REG_ESP, -stack_addend);
+    /* jmp *tb.  */
+    tcg_out_modrm_offset(s, OPC_GRP5, EXT5_JMPN_Ev, TCG_REG_ESP,
+		         (ARRAY_SIZE(tcg_target_callee_save_regs) + 2) * 4
+			 + stack_addend);
+#else
+    tcg_out_mov(s, TCG_TYPE_PTR, TCG_AREG0, tcg_target_call_iarg_regs[0]);
+    tcg_out_addi(s, TCG_REG_ESP, -stack_addend);
+    /* jmp *tb.  */
+    tcg_out_modrm(s, OPC_GRP5, EXT5_JMPN_Ev, tcg_target_call_iarg_regs[1]);
+#endif
+
+    /* TB epilogue */
+    tb_ret_addr = s->code_ptr;
+
+    tcg_out_addi(s, TCG_REG_CALL_STACK, stack_addend);
+
+    for (i = ARRAY_SIZE(tcg_target_callee_save_regs) - 1; i >= 0; i--) {
+        tcg_out_pop(s, tcg_target_callee_save_regs[i]);
+    }
+    tcg_out_opc(s, OPC_RET, 0, 0, 0);
+
+#if !defined(CONFIG_SOFTMMU)
+    /* Try to set up a segment register to point to guest_base.  */
+    if (guest_base) {
+        setup_guest_base_seg();
+    }
+#endif
+}
+
+static void tcg_target_init(TCGContext *s)
+{
+#ifdef CONFIG_CPUID_H
+    unsigned a, b, c, d;
+    int max = __get_cpuid_max(0, 0);
+
+    if (max >= 1) {
+        __cpuid(1, a, b, c, d);
+#ifndef have_cmov
+        /* For 32-bit, 99% certainty that we're running on hardware that
+           supports cmov, but we still need to check.  In case cmov is not
+           available, we'll use a small forward branch.  */
+        have_cmov = (d & bit_CMOV) != 0;
+#endif
+#ifndef have_movbe
+        /* MOVBE is only available on Intel Atom and Haswell CPUs, so we
+           need to probe for it.  */
+        have_movbe = (c & bit_MOVBE) != 0;
+#endif
+    }
+
+    if (max >= 7) {
+        /* BMI1 is available on AMD Piledriver and Intel Haswell CPUs.  */
+        __cpuid_count(7, 0, a, b, c, d);
+#ifdef bit_BMI
+        have_bmi1 = (b & bit_BMI) != 0;
+#endif
+#ifndef have_bmi2
+        have_bmi2 = (b & bit_BMI2) != 0;
+#endif
+    }
+#endif
+
+    if (TCG_TARGET_REG_BITS == 64) {
+        tcg_regset_set32(tcg_target_available_regs[TCG_TYPE_I32], 0, 0xffff);
+        tcg_regset_set32(tcg_target_available_regs[TCG_TYPE_I64], 0, 0xffff);
+    } else {
+        tcg_regset_set32(tcg_target_available_regs[TCG_TYPE_I32], 0, 0xff);
+    }
+
+    tcg_regset_clear(tcg_target_call_clobber_regs);
+    tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_EAX);
+    tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_EDX);
+    tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_ECX);
+    if (TCG_TARGET_REG_BITS == 64) {
+#if !defined(_WIN64)
+        tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_RDI);
+        tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_RSI);
+#endif
+        tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R8);
+        tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R9);
+        tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R10);
+        tcg_regset_set_reg(tcg_target_call_clobber_regs, TCG_REG_R11);
+    }
+
+    tcg_regset_clear(s->reserved_regs);
+    tcg_regset_set_reg(s->reserved_regs, TCG_REG_CALL_STACK);
+
+    tcg_add_target_add_op_defs(x86_op_defs);
+}
+
+typedef struct {
+    DebugFrameHeader h;
+    uint8_t fde_def_cfa[4];
+    uint8_t fde_reg_ofs[14];
+} DebugFrame;
+
+/* We're expecting a 2 byte uleb128 encoded value.  */
+QEMU_BUILD_BUG_ON(FRAME_SIZE >= (1 << 14));
+
+#if !defined(__ELF__)
+    /* Host machine without ELF. */
+#elif TCG_TARGET_REG_BITS == 64
+#define ELF_HOST_MACHINE EM_X86_64
+static const DebugFrame debug_frame = {
+    .h.cie.len = sizeof(DebugFrameCIE)-4, /* length after .len member */
+    .h.cie.id = -1,
+    .h.cie.version = 1,
+    .h.cie.code_align = 1,
+    .h.cie.data_align = 0x78,             /* sleb128 -8 */
+    .h.cie.return_column = 16,
+
+    /* Total FDE size does not include the "len" member.  */
+    .h.fde.len = sizeof(DebugFrame) - offsetof(DebugFrame, h.fde.cie_offset),
+
+    .fde_def_cfa = {
+        12, 7,                          /* DW_CFA_def_cfa %rsp, ... */
+        (FRAME_SIZE & 0x7f) | 0x80,     /* ... uleb128 FRAME_SIZE */
+        (FRAME_SIZE >> 7)
+    },
+    .fde_reg_ofs = {
+        0x90, 1,                        /* DW_CFA_offset, %rip, -8 */
+        /* The following ordering must match tcg_target_callee_save_regs.  */
+        0x86, 2,                        /* DW_CFA_offset, %rbp, -16 */
+        0x83, 3,                        /* DW_CFA_offset, %rbx, -24 */
+        0x8c, 4,                        /* DW_CFA_offset, %r12, -32 */
+        0x8d, 5,                        /* DW_CFA_offset, %r13, -40 */
+        0x8e, 6,                        /* DW_CFA_offset, %r14, -48 */
+        0x8f, 7,                        /* DW_CFA_offset, %r15, -56 */
+    }
+};
+#else
+#define ELF_HOST_MACHINE EM_386
+static const DebugFrame debug_frame = {
+    .h.cie.len = sizeof(DebugFrameCIE)-4, /* length after .len member */
+    .h.cie.id = -1,
+    .h.cie.version = 1,
+    .h.cie.code_align = 1,
+    .h.cie.data_align = 0x7c,             /* sleb128 -4 */
+    .h.cie.return_column = 8,
+
+    /* Total FDE size does not include the "len" member.  */
+    .h.fde.len = sizeof(DebugFrame) - offsetof(DebugFrame, h.fde.cie_offset),
+
+    .fde_def_cfa = {
+        12, 4,                          /* DW_CFA_def_cfa %esp, ... */
+        (FRAME_SIZE & 0x7f) | 0x80,     /* ... uleb128 FRAME_SIZE */
+        (FRAME_SIZE >> 7)
+    },
+    .fde_reg_ofs = {
+        0x88, 1,                        /* DW_CFA_offset, %eip, -4 */
+        /* The following ordering must match tcg_target_callee_save_regs.  */
+        0x85, 2,                        /* DW_CFA_offset, %ebp, -8 */
+        0x83, 3,                        /* DW_CFA_offset, %ebx, -12 */
+        0x86, 4,                        /* DW_CFA_offset, %esi, -16 */
+        0x87, 5,                        /* DW_CFA_offset, %edi, -20 */
+    }
+};
+#endif
+
+#if defined(ELF_HOST_MACHINE)
+void tcg_register_jit(void *buf, size_t buf_size)
+{
+    tcg_register_jit_int(buf, buf_size, &debug_frame, sizeof(debug_frame));
+}
+#endif