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FRET-qemu/tcg/i386/tcg-target.c
Aurelien Jarno 17cf428f2e tcg/i386: generates dec/inc instead of sub/add when possible 
We must take care that dec/inc do not compute CF, which is needed by
add2/sub2.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2009-09-27 20:00:39 +02:00

1256 lines
36 KiB
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/*
* 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.
*/
#ifndef NDEBUG
static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
"%eax",
"%ecx",
"%edx",
"%ebx",
"%esp",
"%ebp",
"%esi",
"%edi",
};
#endif
static const int tcg_target_reg_alloc_order[] = {
TCG_REG_EAX,
TCG_REG_EDX,
TCG_REG_ECX,
TCG_REG_EBX,
TCG_REG_ESI,
TCG_REG_EDI,
TCG_REG_EBP,
};
static const int tcg_target_call_iarg_regs[3] = { TCG_REG_EAX, TCG_REG_EDX, TCG_REG_ECX };
static const int tcg_target_call_oarg_regs[2] = { TCG_REG_EAX, TCG_REG_EDX };
static uint8_t *tb_ret_addr;
static void patch_reloc(uint8_t *code_ptr, int type,
tcg_target_long value, tcg_target_long addend)
{
value += addend;
switch(type) {
case R_386_32:
*(uint32_t *)code_ptr = value;
break;
case R_386_PC32:
*(uint32_t *)code_ptr = value - (long)code_ptr;
break;
default:
tcg_abort();
}
}
/* maximum number of register used for input function arguments */
static inline int tcg_target_get_call_iarg_regs_count(int flags)
{
flags &= TCG_CALL_TYPE_MASK;
switch(flags) {
case TCG_CALL_TYPE_STD:
return 0;
case TCG_CALL_TYPE_REGPARM_1:
case TCG_CALL_TYPE_REGPARM_2:
case TCG_CALL_TYPE_REGPARM:
return flags - TCG_CALL_TYPE_REGPARM_1 + 1;
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':
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;
tcg_regset_set32(ct->u.regs, 0, 0xf);
break;
case 'r':
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, 0xff);
break;
/* qemu_ld/st address constraint */
case 'L':
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, 0xff);
tcg_regset_reset_reg(ct->u.regs, TCG_REG_EAX);
tcg_regset_reset_reg(ct->u.regs, TCG_REG_EDX);
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,
const TCGArgConstraint *arg_ct)
{
int ct;
ct = arg_ct->ct;
if (ct & TCG_CT_CONST)
return 1;
else
return 0;
}
#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
#define SHIFT_ROL 0
#define SHIFT_ROR 1
#define SHIFT_SHL 4
#define SHIFT_SHR 5
#define SHIFT_SAR 7
#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
#define P_EXT 0x100 /* 0x0f opcode prefix */
static const uint8_t tcg_cond_to_jcc[10] = {
[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,
};
static inline void tcg_out_opc(TCGContext *s, int opc)
{
if (opc & P_EXT)
tcg_out8(s, 0x0f);
tcg_out8(s, opc);
}
static inline void tcg_out_modrm(TCGContext *s, int opc, int r, int rm)
{
tcg_out_opc(s, opc);
tcg_out8(s, 0xc0 | (r << 3) | rm);
}
/* rm == -1 means no register index */
static inline void tcg_out_modrm_offset(TCGContext *s, int opc, int r, int rm,
int32_t offset)
{
tcg_out_opc(s, opc);
if (rm == -1) {
tcg_out8(s, 0x05 | (r << 3));
tcg_out32(s, offset);
} else if (offset == 0 && rm != TCG_REG_EBP) {
if (rm == TCG_REG_ESP) {
tcg_out8(s, 0x04 | (r << 3));
tcg_out8(s, 0x24);
} else {
tcg_out8(s, 0x00 | (r << 3) | rm);
}
} else if ((int8_t)offset == offset) {
if (rm == TCG_REG_ESP) {
tcg_out8(s, 0x44 | (r << 3));
tcg_out8(s, 0x24);
} else {
tcg_out8(s, 0x40 | (r << 3) | rm);
}
tcg_out8(s, offset);
} else {
if (rm == TCG_REG_ESP) {
tcg_out8(s, 0x84 | (r << 3));
tcg_out8(s, 0x24);
} else {
tcg_out8(s, 0x80 | (r << 3) | rm);
}
tcg_out32(s, offset);
}
}
static inline void tcg_out_mov(TCGContext *s, int ret, int arg)
{
if (arg != ret)
tcg_out_modrm(s, 0x8b, ret, arg);
}
static inline void tcg_out_movi(TCGContext *s, TCGType type,
int ret, int32_t arg)
{
if (arg == 0) {
/* xor r0,r0 */
tcg_out_modrm(s, 0x01 | (ARITH_XOR << 3), ret, ret);
} else {
tcg_out8(s, 0xb8 + ret);
tcg_out32(s, arg);
}
}
static inline void tcg_out_ld(TCGContext *s, TCGType type, int ret,
int arg1, tcg_target_long arg2)
{
/* movl */
tcg_out_modrm_offset(s, 0x8b, ret, arg1, arg2);
}
static inline void tcg_out_st(TCGContext *s, TCGType type, int arg,
int arg1, tcg_target_long arg2)
{
/* movl */
tcg_out_modrm_offset(s, 0x89, arg, arg1, arg2);
}
static inline void tgen_arithi(TCGContext *s, int c, int r0, int32_t val, int cf)
{
if (!cf && ((c == ARITH_ADD && val == 1) || (c == ARITH_SUB && val == -1))) {
/* inc */
tcg_out_opc(s, 0x40 + r0);
} else if (!cf && ((c == ARITH_ADD && val == -1) || (c == ARITH_SUB && val == 1))) {
/* dec */
tcg_out_opc(s, 0x48 + r0);
} else if (val == (int8_t)val) {
tcg_out_modrm(s, 0x83, c, r0);
tcg_out8(s, val);
} else if (c == ARITH_AND && val == 0xffu && r0 < 4) {
/* movzbl */
tcg_out_modrm(s, 0xb6 | P_EXT, r0, r0);
} else if (c == ARITH_AND && val == 0xffffu) {
/* movzwl */
tcg_out_modrm(s, 0xb7 | P_EXT, r0, r0);
} else {
tcg_out_modrm(s, 0x81, c, r0);
tcg_out32(s, val);
}
}
static void tcg_out_addi(TCGContext *s, int reg, tcg_target_long val)
{
if (val != 0)
tgen_arithi(s, ARITH_ADD, reg, val, 0);
}
static void tcg_out_jxx(TCGContext *s, int opc, int label_index)
{
int32_t val, val1;
TCGLabel *l = &s->labels[label_index];
if (l->has_value) {
val = l->u.value - (tcg_target_long)s->code_ptr;
val1 = val - 2;
if ((int8_t)val1 == val1) {
if (opc == -1)
tcg_out8(s, 0xeb);
else
tcg_out8(s, 0x70 + opc);
tcg_out8(s, val1);
} else {
if (opc == -1) {
tcg_out8(s, 0xe9);
tcg_out32(s, val - 5);
} else {
tcg_out8(s, 0x0f);
tcg_out8(s, 0x80 + opc);
tcg_out32(s, val - 6);
}
}
} else {
if (opc == -1) {
tcg_out8(s, 0xe9);
} else {
tcg_out8(s, 0x0f);
tcg_out8(s, 0x80 + opc);
}
tcg_out_reloc(s, s->code_ptr, R_386_PC32, label_index, -4);
s->code_ptr += 4;
}
}
static void tcg_out_brcond(TCGContext *s, int cond,
TCGArg arg1, TCGArg arg2, int const_arg2,
int label_index)
{
if (const_arg2) {
if (arg2 == 0) {
/* test r, r */
tcg_out_modrm(s, 0x85, arg1, arg1);
} else {
tgen_arithi(s, ARITH_CMP, arg1, arg2, 0);
}
} else {
tcg_out_modrm(s, 0x01 | (ARITH_CMP << 3), arg2, arg1);
}
tcg_out_jxx(s, tcg_cond_to_jcc[cond], label_index);
}
/* 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 label_next;
label_next = gen_new_label();
switch(args[4]) {
case TCG_COND_EQ:
tcg_out_brcond(s, TCG_COND_NE, args[0], args[2], const_args[2], label_next);
tcg_out_brcond(s, TCG_COND_EQ, args[1], args[3], const_args[3], args[5]);
break;
case TCG_COND_NE:
tcg_out_brcond(s, TCG_COND_NE, args[0], args[2], const_args[2], args[5]);
tcg_out_brcond(s, TCG_COND_NE, args[1], args[3], const_args[3], args[5]);
break;
case TCG_COND_LT:
tcg_out_brcond(s, TCG_COND_LT, args[1], args[3], const_args[3], args[5]);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_LTU, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_LE:
tcg_out_brcond(s, TCG_COND_LT, args[1], args[3], const_args[3], args[5]);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_LEU, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_GT:
tcg_out_brcond(s, TCG_COND_GT, args[1], args[3], const_args[3], args[5]);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_GTU, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_GE:
tcg_out_brcond(s, TCG_COND_GT, args[1], args[3], const_args[3], args[5]);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_GEU, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_LTU:
tcg_out_brcond(s, TCG_COND_LTU, args[1], args[3], const_args[3], args[5]);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_LTU, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_LEU:
tcg_out_brcond(s, TCG_COND_LTU, args[1], args[3], const_args[3], args[5]);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_LEU, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_GTU:
tcg_out_brcond(s, TCG_COND_GTU, args[1], args[3], const_args[3], args[5]);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_GTU, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_GEU:
tcg_out_brcond(s, TCG_COND_GTU, args[1], args[3], const_args[3], args[5]);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_GEU, args[0], args[2], const_args[2], args[5]);
break;
default:
tcg_abort();
}
tcg_out_label(s, label_next, (tcg_target_long)s->code_ptr);
}
#if defined(CONFIG_SOFTMMU)
#include "../../softmmu_defs.h"
static void *qemu_ld_helpers[4] = {
__ldb_mmu,
__ldw_mmu,
__ldl_mmu,
__ldq_mmu,
};
static void *qemu_st_helpers[4] = {
__stb_mmu,
__stw_mmu,
__stl_mmu,
__stq_mmu,
};
#endif
#ifndef CONFIG_USER_ONLY
#define GUEST_BASE 0
#endif
/* 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,
int opc)
{
int addr_reg, data_reg, data_reg2, r0, r1, mem_index, s_bits, bswap;
#if defined(CONFIG_SOFTMMU)
uint8_t *label1_ptr, *label2_ptr;
#endif
#if TARGET_LONG_BITS == 64
#if defined(CONFIG_SOFTMMU)
uint8_t *label3_ptr;
#endif
int addr_reg2;
#endif
data_reg = *args++;
if (opc == 3)
data_reg2 = *args++;
else
data_reg2 = 0;
addr_reg = *args++;
#if TARGET_LONG_BITS == 64
addr_reg2 = *args++;
#endif
mem_index = *args;
s_bits = opc & 3;
r0 = TCG_REG_EAX;
r1 = TCG_REG_EDX;
#if defined(CONFIG_SOFTMMU)
tcg_out_mov(s, r1, addr_reg);
tcg_out_mov(s, r0, addr_reg);
tcg_out_modrm(s, 0xc1, 5, r1); /* shr $x, r1 */
tcg_out8(s, TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS);
tcg_out_modrm(s, 0x81, 4, r0); /* andl $x, r0 */
tcg_out32(s, TARGET_PAGE_MASK | ((1 << s_bits) - 1));
tcg_out_modrm(s, 0x81, 4, r1); /* andl $x, r1 */
tcg_out32(s, (CPU_TLB_SIZE - 1) << CPU_TLB_ENTRY_BITS);
tcg_out_opc(s, 0x8d); /* lea offset(r1, %ebp), r1 */
tcg_out8(s, 0x80 | (r1 << 3) | 0x04);
tcg_out8(s, (5 << 3) | r1);
tcg_out32(s, offsetof(CPUState, tlb_table[mem_index][0].addr_read));
/* cmp 0(r1), r0 */
tcg_out_modrm_offset(s, 0x3b, r0, r1, 0);
tcg_out_mov(s, r0, addr_reg);
#if TARGET_LONG_BITS == 32
/* je label1 */
tcg_out8(s, 0x70 + JCC_JE);
label1_ptr = s->code_ptr;
s->code_ptr++;
#else
/* jne label3 */
tcg_out8(s, 0x70 + JCC_JNE);
label3_ptr = s->code_ptr;
s->code_ptr++;
/* cmp 4(r1), addr_reg2 */
tcg_out_modrm_offset(s, 0x3b, addr_reg2, r1, 4);
/* je label1 */
tcg_out8(s, 0x70 + JCC_JE);
label1_ptr = s->code_ptr;
s->code_ptr++;
/* label3: */
*label3_ptr = s->code_ptr - label3_ptr - 1;
#endif
/* XXX: move that code at the end of the TB */
#if TARGET_LONG_BITS == 32
tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_EDX, mem_index);
#else
tcg_out_mov(s, TCG_REG_EDX, addr_reg2);
tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_ECX, mem_index);
#endif
tcg_out8(s, 0xe8);
tcg_out32(s, (tcg_target_long)qemu_ld_helpers[s_bits] -
(tcg_target_long)s->code_ptr - 4);
switch(opc) {
case 0 | 4:
/* movsbl */
tcg_out_modrm(s, 0xbe | P_EXT, data_reg, TCG_REG_EAX);
break;
case 1 | 4:
/* movswl */
tcg_out_modrm(s, 0xbf | P_EXT, data_reg, TCG_REG_EAX);
break;
case 0:
/* movzbl */
tcg_out_modrm(s, 0xb6 | P_EXT, data_reg, TCG_REG_EAX);
break;
case 1:
/* movzwl */
tcg_out_modrm(s, 0xb7 | P_EXT, data_reg, TCG_REG_EAX);
break;
case 2:
default:
tcg_out_mov(s, data_reg, TCG_REG_EAX);
break;
case 3:
if (data_reg == TCG_REG_EDX) {
tcg_out_opc(s, 0x90 + TCG_REG_EDX); /* xchg %edx, %eax */
tcg_out_mov(s, data_reg2, TCG_REG_EAX);
} else {
tcg_out_mov(s, data_reg, TCG_REG_EAX);
tcg_out_mov(s, data_reg2, TCG_REG_EDX);
}
break;
}
/* jmp label2 */
tcg_out8(s, 0xeb);
label2_ptr = s->code_ptr;
s->code_ptr++;
/* label1: */
*label1_ptr = s->code_ptr - label1_ptr - 1;
/* add x(r1), r0 */
tcg_out_modrm_offset(s, 0x03, r0, r1, offsetof(CPUTLBEntry, addend) -
offsetof(CPUTLBEntry, addr_read));
#else
r0 = addr_reg;
#endif
#ifdef TARGET_WORDS_BIGENDIAN
bswap = 1;
#else
bswap = 0;
#endif
switch(opc) {
case 0:
/* movzbl */
tcg_out_modrm_offset(s, 0xb6 | P_EXT, data_reg, r0, GUEST_BASE);
break;
case 0 | 4:
/* movsbl */
tcg_out_modrm_offset(s, 0xbe | P_EXT, data_reg, r0, GUEST_BASE);
break;
case 1:
/* movzwl */
tcg_out_modrm_offset(s, 0xb7 | P_EXT, data_reg, r0, GUEST_BASE);
if (bswap) {
/* rolw $8, data_reg */
tcg_out8(s, 0x66);
tcg_out_modrm(s, 0xc1, 0, data_reg);
tcg_out8(s, 8);
}
break;
case 1 | 4:
/* movswl */
tcg_out_modrm_offset(s, 0xbf | P_EXT, data_reg, r0, GUEST_BASE);
if (bswap) {
/* rolw $8, data_reg */
tcg_out8(s, 0x66);
tcg_out_modrm(s, 0xc1, 0, data_reg);
tcg_out8(s, 8);
/* movswl data_reg, data_reg */
tcg_out_modrm(s, 0xbf | P_EXT, data_reg, data_reg);
}
break;
case 2:
/* movl (r0), data_reg */
tcg_out_modrm_offset(s, 0x8b, data_reg, r0, GUEST_BASE);
if (bswap) {
/* bswap */
tcg_out_opc(s, (0xc8 + data_reg) | P_EXT);
}
break;
case 3:
/* XXX: could be nicer */
if (r0 == data_reg) {
r1 = TCG_REG_EDX;
if (r1 == data_reg)
r1 = TCG_REG_EAX;
tcg_out_mov(s, r1, r0);
r0 = r1;
}
if (!bswap) {
tcg_out_modrm_offset(s, 0x8b, data_reg, r0, GUEST_BASE);
tcg_out_modrm_offset(s, 0x8b, data_reg2, r0, GUEST_BASE + 4);
} else {
tcg_out_modrm_offset(s, 0x8b, data_reg, r0, GUEST_BASE + 4);
tcg_out_opc(s, (0xc8 + data_reg) | P_EXT);
tcg_out_modrm_offset(s, 0x8b, data_reg2, r0, GUEST_BASE);
/* bswap */
tcg_out_opc(s, (0xc8 + data_reg2) | P_EXT);
}
break;
default:
tcg_abort();
}
#if defined(CONFIG_SOFTMMU)
/* label2: */
*label2_ptr = s->code_ptr - label2_ptr - 1;
#endif
}
static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
int opc)
{
int addr_reg, data_reg, data_reg2, r0, r1, mem_index, s_bits, bswap;
#if defined(CONFIG_SOFTMMU)
uint8_t *label1_ptr, *label2_ptr;
#endif
#if TARGET_LONG_BITS == 64
#if defined(CONFIG_SOFTMMU)
uint8_t *label3_ptr;
#endif
int addr_reg2;
#endif
data_reg = *args++;
if (opc == 3)
data_reg2 = *args++;
else
data_reg2 = 0;
addr_reg = *args++;
#if TARGET_LONG_BITS == 64
addr_reg2 = *args++;
#endif
mem_index = *args;
s_bits = opc;
r0 = TCG_REG_EAX;
r1 = TCG_REG_EDX;
#if defined(CONFIG_SOFTMMU)
tcg_out_mov(s, r1, addr_reg);
tcg_out_mov(s, r0, addr_reg);
tcg_out_modrm(s, 0xc1, 5, r1); /* shr $x, r1 */
tcg_out8(s, TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS);
tcg_out_modrm(s, 0x81, 4, r0); /* andl $x, r0 */
tcg_out32(s, TARGET_PAGE_MASK | ((1 << s_bits) - 1));
tcg_out_modrm(s, 0x81, 4, r1); /* andl $x, r1 */
tcg_out32(s, (CPU_TLB_SIZE - 1) << CPU_TLB_ENTRY_BITS);
tcg_out_opc(s, 0x8d); /* lea offset(r1, %ebp), r1 */
tcg_out8(s, 0x80 | (r1 << 3) | 0x04);
tcg_out8(s, (5 << 3) | r1);
tcg_out32(s, offsetof(CPUState, tlb_table[mem_index][0].addr_write));
/* cmp 0(r1), r0 */
tcg_out_modrm_offset(s, 0x3b, r0, r1, 0);
tcg_out_mov(s, r0, addr_reg);
#if TARGET_LONG_BITS == 32
/* je label1 */
tcg_out8(s, 0x70 + JCC_JE);
label1_ptr = s->code_ptr;
s->code_ptr++;
#else
/* jne label3 */
tcg_out8(s, 0x70 + JCC_JNE);
label3_ptr = s->code_ptr;
s->code_ptr++;
/* cmp 4(r1), addr_reg2 */
tcg_out_modrm_offset(s, 0x3b, addr_reg2, r1, 4);
/* je label1 */
tcg_out8(s, 0x70 + JCC_JE);
label1_ptr = s->code_ptr;
s->code_ptr++;
/* label3: */
*label3_ptr = s->code_ptr - label3_ptr - 1;
#endif
/* XXX: move that code at the end of the TB */
#if TARGET_LONG_BITS == 32
if (opc == 3) {
tcg_out_mov(s, TCG_REG_EDX, data_reg);
tcg_out_mov(s, TCG_REG_ECX, data_reg2);
tcg_out8(s, 0x6a); /* push Ib */
tcg_out8(s, mem_index);
tcg_out8(s, 0xe8);
tcg_out32(s, (tcg_target_long)qemu_st_helpers[s_bits] -
(tcg_target_long)s->code_ptr - 4);
tcg_out_addi(s, TCG_REG_ESP, 4);
} else {
switch(opc) {
case 0:
/* movzbl */
tcg_out_modrm(s, 0xb6 | P_EXT, TCG_REG_EDX, data_reg);
break;
case 1:
/* movzwl */
tcg_out_modrm(s, 0xb7 | P_EXT, TCG_REG_EDX, data_reg);
break;
case 2:
tcg_out_mov(s, TCG_REG_EDX, data_reg);
break;
}
tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_ECX, mem_index);
tcg_out8(s, 0xe8);
tcg_out32(s, (tcg_target_long)qemu_st_helpers[s_bits] -
(tcg_target_long)s->code_ptr - 4);
}
#else
if (opc == 3) {
tcg_out_mov(s, TCG_REG_EDX, addr_reg2);
tcg_out8(s, 0x6a); /* push Ib */
tcg_out8(s, mem_index);
tcg_out_opc(s, 0x50 + data_reg2); /* push */
tcg_out_opc(s, 0x50 + data_reg); /* push */
tcg_out8(s, 0xe8);
tcg_out32(s, (tcg_target_long)qemu_st_helpers[s_bits] -
(tcg_target_long)s->code_ptr - 4);
tcg_out_addi(s, TCG_REG_ESP, 12);
} else {
tcg_out_mov(s, TCG_REG_EDX, addr_reg2);
switch(opc) {
case 0:
/* movzbl */
tcg_out_modrm(s, 0xb6 | P_EXT, TCG_REG_ECX, data_reg);
break;
case 1:
/* movzwl */
tcg_out_modrm(s, 0xb7 | P_EXT, TCG_REG_ECX, data_reg);
break;
case 2:
tcg_out_mov(s, TCG_REG_ECX, data_reg);
break;
}
tcg_out8(s, 0x6a); /* push Ib */
tcg_out8(s, mem_index);
tcg_out8(s, 0xe8);
tcg_out32(s, (tcg_target_long)qemu_st_helpers[s_bits] -
(tcg_target_long)s->code_ptr - 4);
tcg_out_addi(s, TCG_REG_ESP, 4);
}
#endif
/* jmp label2 */
tcg_out8(s, 0xeb);
label2_ptr = s->code_ptr;
s->code_ptr++;
/* label1: */
*label1_ptr = s->code_ptr - label1_ptr - 1;
/* add x(r1), r0 */
tcg_out_modrm_offset(s, 0x03, r0, r1, offsetof(CPUTLBEntry, addend) -
offsetof(CPUTLBEntry, addr_write));
#else
r0 = addr_reg;
#endif
#ifdef TARGET_WORDS_BIGENDIAN
bswap = 1;
#else
bswap = 0;
#endif
switch(opc) {
case 0:
/* movb */
tcg_out_modrm_offset(s, 0x88, data_reg, r0, GUEST_BASE);
break;
case 1:
if (bswap) {
tcg_out_mov(s, r1, data_reg);
tcg_out8(s, 0x66); /* rolw $8, %ecx */
tcg_out_modrm(s, 0xc1, 0, r1);
tcg_out8(s, 8);
data_reg = r1;
}
/* movw */
tcg_out8(s, 0x66);
tcg_out_modrm_offset(s, 0x89, data_reg, r0, GUEST_BASE);
break;
case 2:
if (bswap) {
tcg_out_mov(s, r1, data_reg);
/* bswap data_reg */
tcg_out_opc(s, (0xc8 + r1) | P_EXT);
data_reg = r1;
}
/* movl */
tcg_out_modrm_offset(s, 0x89, data_reg, r0, GUEST_BASE);
break;
case 3:
if (bswap) {
tcg_out_mov(s, r1, data_reg2);
/* bswap data_reg */
tcg_out_opc(s, (0xc8 + r1) | P_EXT);
tcg_out_modrm_offset(s, 0x89, r1, r0, GUEST_BASE);
tcg_out_mov(s, r1, data_reg);
/* bswap data_reg */
tcg_out_opc(s, (0xc8 + r1) | P_EXT);
tcg_out_modrm_offset(s, 0x89, r1, r0, GUEST_BASE + 4);
} else {
tcg_out_modrm_offset(s, 0x89, data_reg, r0, GUEST_BASE);
tcg_out_modrm_offset(s, 0x89, data_reg2, r0, GUEST_BASE + 4);
}
break;
default:
tcg_abort();
}
#if defined(CONFIG_SOFTMMU)
/* label2: */
*label2_ptr = s->code_ptr - label2_ptr - 1;
#endif
}
static inline void tcg_out_op(TCGContext *s, int opc,
const TCGArg *args, const int *const_args)
{
int c;
switch(opc) {
case INDEX_op_exit_tb:
tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_EAX, args[0]);
tcg_out8(s, 0xe9); /* jmp tb_ret_addr */
tcg_out32(s, tb_ret_addr - s->code_ptr - 4);
break;
case INDEX_op_goto_tb:
if (s->tb_jmp_offset) {
/* direct jump method */
tcg_out8(s, 0xe9); /* jmp im */
s->tb_jmp_offset[args[0]] = s->code_ptr - s->code_buf;
tcg_out32(s, 0);
} else {
/* indirect jump method */
/* jmp Ev */
tcg_out_modrm_offset(s, 0xff, 4, -1,
(tcg_target_long)(s->tb_next + args[0]));
}
s->tb_next_offset[args[0]] = s->code_ptr - s->code_buf;
break;
case INDEX_op_call:
if (const_args[0]) {
tcg_out8(s, 0xe8);
tcg_out32(s, args[0] - (tcg_target_long)s->code_ptr - 4);
} else {
tcg_out_modrm(s, 0xff, 2, args[0]);
}
break;
case INDEX_op_jmp:
if (const_args[0]) {
tcg_out8(s, 0xe9);
tcg_out32(s, args[0] - (tcg_target_long)s->code_ptr - 4);
} else {
tcg_out_modrm(s, 0xff, 4, args[0]);
}
break;
case INDEX_op_br:
tcg_out_jxx(s, JCC_JMP, args[0]);
break;
case INDEX_op_movi_i32:
tcg_out_movi(s, TCG_TYPE_I32, args[0], args[1]);
break;
case INDEX_op_ld8u_i32:
/* movzbl */
tcg_out_modrm_offset(s, 0xb6 | P_EXT, args[0], args[1], args[2]);
break;
case INDEX_op_ld8s_i32:
/* movsbl */
tcg_out_modrm_offset(s, 0xbe | P_EXT, args[0], args[1], args[2]);
break;
case INDEX_op_ld16u_i32:
/* movzwl */
tcg_out_modrm_offset(s, 0xb7 | P_EXT, args[0], args[1], args[2]);
break;
case INDEX_op_ld16s_i32:
/* movswl */
tcg_out_modrm_offset(s, 0xbf | P_EXT, args[0], args[1], args[2]);
break;
case INDEX_op_ld_i32:
/* movl */
tcg_out_modrm_offset(s, 0x8b, args[0], args[1], args[2]);
break;
case INDEX_op_st8_i32:
/* movb */
tcg_out_modrm_offset(s, 0x88, args[0], args[1], args[2]);
break;
case INDEX_op_st16_i32:
/* movw */
tcg_out8(s, 0x66);
tcg_out_modrm_offset(s, 0x89, args[0], args[1], args[2]);
break;
case INDEX_op_st_i32:
/* movl */
tcg_out_modrm_offset(s, 0x89, args[0], args[1], args[2]);
break;
case INDEX_op_sub_i32:
c = ARITH_SUB;
goto gen_arith;
case INDEX_op_and_i32:
c = ARITH_AND;
goto gen_arith;
case INDEX_op_or_i32:
c = ARITH_OR;
goto gen_arith;
case INDEX_op_xor_i32:
c = ARITH_XOR;
goto gen_arith;
case INDEX_op_add_i32:
c = ARITH_ADD;
gen_arith:
if (const_args[2]) {
tgen_arithi(s, c, args[0], args[2], 0);
} else {
tcg_out_modrm(s, 0x01 | (c << 3), args[2], args[0]);
}
break;
case INDEX_op_mul_i32:
if (const_args[2]) {
int32_t val;
val = args[2];
if (val == (int8_t)val) {
tcg_out_modrm(s, 0x6b, args[0], args[0]);
tcg_out8(s, val);
} else {
tcg_out_modrm(s, 0x69, args[0], args[0]);
tcg_out32(s, val);
}
} else {
tcg_out_modrm(s, 0xaf | P_EXT, args[0], args[2]);
}
break;
case INDEX_op_mulu2_i32:
tcg_out_modrm(s, 0xf7, 4, args[3]);
break;
case INDEX_op_div2_i32:
tcg_out_modrm(s, 0xf7, 7, args[4]);
break;
case INDEX_op_divu2_i32:
tcg_out_modrm(s, 0xf7, 6, args[4]);
break;
case INDEX_op_shl_i32:
c = SHIFT_SHL;
gen_shift32:
if (const_args[2]) {
if (args[2] == 1) {
tcg_out_modrm(s, 0xd1, c, args[0]);
} else {
tcg_out_modrm(s, 0xc1, c, args[0]);
tcg_out8(s, args[2]);
}
} else {
tcg_out_modrm(s, 0xd3, c, args[0]);
}
break;
case INDEX_op_shr_i32:
c = SHIFT_SHR;
goto gen_shift32;
case INDEX_op_sar_i32:
c = SHIFT_SAR;
goto gen_shift32;
case INDEX_op_rotl_i32:
c = SHIFT_ROL;
goto gen_shift32;
case INDEX_op_rotr_i32:
c = SHIFT_ROR;
goto gen_shift32;
case INDEX_op_add2_i32:
if (const_args[4])
tgen_arithi(s, ARITH_ADD, args[0], args[4], 1);
else
tcg_out_modrm(s, 0x01 | (ARITH_ADD << 3), args[4], args[0]);
if (const_args[5])
tgen_arithi(s, ARITH_ADC, args[1], args[5], 1);
else
tcg_out_modrm(s, 0x01 | (ARITH_ADC << 3), args[5], args[1]);
break;
case INDEX_op_sub2_i32:
if (const_args[4])
tgen_arithi(s, ARITH_SUB, args[0], args[4], 1);
else
tcg_out_modrm(s, 0x01 | (ARITH_SUB << 3), args[4], args[0]);
if (const_args[5])
tgen_arithi(s, ARITH_SBB, args[1], args[5], 1);
else
tcg_out_modrm(s, 0x01 | (ARITH_SBB << 3), args[5], args[1]);
break;
case INDEX_op_brcond_i32:
tcg_out_brcond(s, args[2], args[0], args[1], const_args[1], args[3]);
break;
case INDEX_op_brcond2_i32:
tcg_out_brcond2(s, args, const_args);
break;
case INDEX_op_bswap16_i32:
tcg_out8(s, 0x66);
tcg_out_modrm(s, 0xc1, SHIFT_ROL, args[0]);
tcg_out8(s, 8);
break;
case INDEX_op_bswap32_i32:
tcg_out_opc(s, (0xc8 + args[0]) | P_EXT);
break;
case INDEX_op_neg_i32:
tcg_out_modrm(s, 0xf7, 3, args[0]);
break;
case INDEX_op_not_i32:
tcg_out_modrm(s, 0xf7, 2, args[0]);
break;
case INDEX_op_ext8s_i32:
tcg_out_modrm(s, 0xbe | P_EXT, args[0], args[1]);
break;
case INDEX_op_ext16s_i32:
tcg_out_modrm(s, 0xbf | P_EXT, args[0], args[1]);
break;
case INDEX_op_qemu_ld8u:
tcg_out_qemu_ld(s, args, 0);
break;
case INDEX_op_qemu_ld8s:
tcg_out_qemu_ld(s, args, 0 | 4);
break;
case INDEX_op_qemu_ld16u:
tcg_out_qemu_ld(s, args, 1);
break;
case INDEX_op_qemu_ld16s:
tcg_out_qemu_ld(s, args, 1 | 4);
break;
case INDEX_op_qemu_ld32u:
tcg_out_qemu_ld(s, args, 2);
break;
case INDEX_op_qemu_ld64:
tcg_out_qemu_ld(s, args, 3);
break;
case INDEX_op_qemu_st8:
tcg_out_qemu_st(s, args, 0);
break;
case INDEX_op_qemu_st16:
tcg_out_qemu_st(s, args, 1);
break;
case INDEX_op_qemu_st32:
tcg_out_qemu_st(s, args, 2);
break;
case INDEX_op_qemu_st64:
tcg_out_qemu_st(s, args, 3);
break;
default:
tcg_abort();
}
}
static const TCGTargetOpDef x86_op_defs[] = {
{ INDEX_op_exit_tb, { } },
{ INDEX_op_goto_tb, { } },
{ INDEX_op_call, { "ri" } },
{ INDEX_op_jmp, { "ri" } },
{ INDEX_op_br, { } },
{ INDEX_op_mov_i32, { "r", "r" } },
{ INDEX_op_movi_i32, { "r" } },
{ 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, { "q", "r" } },
{ INDEX_op_st16_i32, { "r", "r" } },
{ INDEX_op_st_i32, { "r", "r" } },
{ INDEX_op_add_i32, { "r", "0", "ri" } },
{ INDEX_op_sub_i32, { "r", "0", "ri" } },
{ INDEX_op_mul_i32, { "r", "0", "ri" } },
{ INDEX_op_mulu2_i32, { "a", "d", "a", "r" } },
{ 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_shl_i32, { "r", "0", "ci" } },
{ INDEX_op_shr_i32, { "r", "0", "ci" } },
{ INDEX_op_sar_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_add2_i32, { "r", "r", "0", "1", "ri", "ri" } },
{ INDEX_op_sub2_i32, { "r", "r", "0", "1", "ri", "ri" } },
{ INDEX_op_brcond2_i32, { "r", "r", "ri", "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" } },
#if TARGET_LONG_BITS == 32
{ INDEX_op_qemu_ld8u, { "r", "L" } },
{ INDEX_op_qemu_ld8s, { "r", "L" } },
{ INDEX_op_qemu_ld16u, { "r", "L" } },
{ INDEX_op_qemu_ld16s, { "r", "L" } },
{ INDEX_op_qemu_ld32u, { "r", "L" } },
{ INDEX_op_qemu_ld64, { "r", "r", "L" } },
{ INDEX_op_qemu_st8, { "cb", "L" } },
{ INDEX_op_qemu_st16, { "L", "L" } },
{ INDEX_op_qemu_st32, { "L", "L" } },
{ INDEX_op_qemu_st64, { "L", "L", "L" } },
#else
{ INDEX_op_qemu_ld8u, { "r", "L", "L" } },
{ INDEX_op_qemu_ld8s, { "r", "L", "L" } },
{ INDEX_op_qemu_ld16u, { "r", "L", "L" } },
{ INDEX_op_qemu_ld16s, { "r", "L", "L" } },
{ INDEX_op_qemu_ld32u, { "r", "L", "L" } },
{ INDEX_op_qemu_ld64, { "r", "r", "L", "L" } },
{ INDEX_op_qemu_st8, { "cb", "L", "L" } },
{ INDEX_op_qemu_st16, { "L", "L", "L" } },
{ INDEX_op_qemu_st32, { "L", "L", "L" } },
{ INDEX_op_qemu_st64, { "L", "L", "L", "L" } },
#endif
{ -1 },
};
static int tcg_target_callee_save_regs[] = {
/* TCG_REG_EBP, */ /* currently used for the global env, so no
need to save */
TCG_REG_EBX,
TCG_REG_ESI,
TCG_REG_EDI,
};
static inline void tcg_out_push(TCGContext *s, int reg)
{
tcg_out_opc(s, 0x50 + reg);
}
static inline void tcg_out_pop(TCGContext *s, int reg)
{
tcg_out_opc(s, 0x58 + reg);
}
/* Generate global QEMU prologue and epilogue code */
void tcg_target_qemu_prologue(TCGContext *s)
{
int i, frame_size, push_size, stack_addend;
/* TB prologue */
/* 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]);
}
/* reserve some stack space */
push_size = 4 + ARRAY_SIZE(tcg_target_callee_save_regs) * 4;
frame_size = push_size + TCG_STATIC_CALL_ARGS_SIZE;
frame_size = (frame_size + TCG_TARGET_STACK_ALIGN - 1) &
~(TCG_TARGET_STACK_ALIGN - 1);
stack_addend = frame_size - push_size;
tcg_out_addi(s, TCG_REG_ESP, -stack_addend);
tcg_out_modrm(s, 0xff, 4, TCG_REG_EAX); /* jmp *%eax */
/* TB epilogue */
tb_ret_addr = s->code_ptr;
tcg_out_addi(s, TCG_REG_ESP, 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_out8(s, 0xc3); /* ret */
}
void tcg_target_init(TCGContext *s)
{
/* fail safe */
if ((1 << CPU_TLB_ENTRY_BITS) != sizeof(CPUTLBEntry))
tcg_abort();
tcg_regset_set32(tcg_target_available_regs[TCG_TYPE_I32], 0, 0xff);
tcg_regset_set32(tcg_target_call_clobber_regs, 0,
(1 << TCG_REG_EAX) |
(1 << TCG_REG_EDX) |
(1 << TCG_REG_ECX));
tcg_regset_clear(s->reserved_regs);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_ESP);
tcg_add_target_add_op_defs(x86_op_defs);
}
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