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tcg-i386: Tidy jumps. 

Define OPC_JCC*, OC_JMP*, and EXT_JMPN_Ev.  Use them throughout.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2010-04-14 08:26:50 -07:00 committed by Aurelien Jarno
parent a042ef9470
commit da441cffde
1 changed files with 33 additions and 25 deletions
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58
tcg/i386/tcg-target.c
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@ -159,6 +159,10 @@ static inline int tcg_target_const_match(tcg_target_long val,
#define P_EXT 0x100 /* 0x0f opcode prefix */
#define OPC_BSWAP (0xc8 | P_EXT)
#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_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 */
@ -166,6 +170,7 @@ static inline int tcg_target_const_match(tcg_target_long val,
#define OPC_SHIFT_Ib (0xc1)
#define OPC_SHIFT_cl (0xd3)
/* Group 1 opcode extensions for 0x80-0x83. */
#define ARITH_ADD 0
#define ARITH_OR 1
#define ARITH_ADC 2
@ -175,12 +180,17 @@ static inline int tcg_target_const_match(tcg_target_long val,
#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 5 opcode extensions for 0xff. */
#define EXT_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
@ -353,9 +363,9 @@ static void tcg_out_jxx(TCGContext *s, int opc, int label_index, int small)
val1 = val - 2;
if ((int8_t)val1 == val1) {
if (opc == -1) {
tcg_out8(s, 0xeb);
tcg_out8(s, OPC_JMP_short);
} else {
tcg_out8(s, 0x70 + opc);
tcg_out8(s, OPC_JCC_short + opc);
}
tcg_out8(s, val1);
} else {
@ -363,28 +373,26 @@ static void tcg_out_jxx(TCGContext *s, int opc, int label_index, int small)
tcg_abort();
}
if (opc == -1) {
tcg_out8(s, 0xe9);
tcg_out8(s, OPC_JMP_long);
tcg_out32(s, val - 5);
} else {
tcg_out8(s, 0x0f);
tcg_out8(s, 0x80 + opc);
tcg_out_opc(s, OPC_JCC_long + opc);
tcg_out32(s, val - 6);
}
}
} else if (small) {
if (opc == -1) {
tcg_out8(s, 0xeb);
tcg_out8(s, OPC_JMP_short);
} else {
tcg_out8(s, 0x70 + opc);
tcg_out8(s, OPC_JCC_short + opc);
}
tcg_out_reloc(s, s->code_ptr, R_386_PC8, label_index, -1);
s->code_ptr += 1;
} else {
if (opc == -1) {
tcg_out8(s, 0xe9);
tcg_out8(s, OPC_JMP_long);
} else {
tcg_out8(s, 0x0f);
tcg_out8(s, 0x80 + opc);
tcg_out_opc(s, OPC_JCC_long + opc);
}
tcg_out_reloc(s, s->code_ptr, R_386_PC32, label_index, -4);
s->code_ptr += 4;
@ -627,12 +635,12 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
#if TARGET_LONG_BITS == 32
/* je label1 */
tcg_out8(s, 0x70 + JCC_JE);
tcg_out8(s, OPC_JCC_short + JCC_JE);
label1_ptr = s->code_ptr;
s->code_ptr++;
#else
/* jne label3 */
tcg_out8(s, 0x70 + JCC_JNE);
tcg_out8(s, OPC_JCC_short + JCC_JNE);
label3_ptr = s->code_ptr;
s->code_ptr++;
@ -640,7 +648,7 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
tcg_out_modrm_offset(s, 0x3b, addr_reg2, r1, 4);
/* je label1 */
tcg_out8(s, 0x70 + JCC_JE);
tcg_out8(s, OPC_JCC_short + JCC_JE);
label1_ptr = s->code_ptr;
s->code_ptr++;
@ -692,7 +700,7 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
}
/* jmp label2 */
tcg_out8(s, 0xeb);
tcg_out8(s, OPC_JMP_short);
label2_ptr = s->code_ptr;
s->code_ptr++;
@ -827,12 +835,12 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
#if TARGET_LONG_BITS == 32
/* je label1 */
tcg_out8(s, 0x70 + JCC_JE);
tcg_out8(s, OPC_JCC_short + JCC_JE);
label1_ptr = s->code_ptr;
s->code_ptr++;
#else
/* jne label3 */
tcg_out8(s, 0x70 + JCC_JNE);
tcg_out8(s, OPC_JCC_short + JCC_JNE);
label3_ptr = s->code_ptr;
s->code_ptr++;
@ -840,7 +848,7 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
tcg_out_modrm_offset(s, 0x3b, addr_reg2, r1, 4);
/* je label1 */
tcg_out8(s, 0x70 + JCC_JE);
tcg_out8(s, OPC_JCC_short + JCC_JE);
label1_ptr = s->code_ptr;
s->code_ptr++;
@ -914,7 +922,7 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
#endif
/* jmp label2 */
tcg_out8(s, 0xeb);
tcg_out8(s, OPC_JMP_short);
label2_ptr = s->code_ptr;
s->code_ptr++;
@ -986,19 +994,18 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
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_out8(s, OPC_JMP_long); /* 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 */
tcg_out8(s, OPC_JMP_long); /* 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_out_modrm_offset(s, 0xff, EXT_JMPN_Ev, -1,
(tcg_target_long)(s->tb_next + args[0]));
}
s->tb_next_offset[args[0]] = s->code_ptr - s->code_buf;
@ -1013,10 +1020,11 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
break;
case INDEX_op_jmp:
if (const_args[0]) {
tcg_out8(s, 0xe9);
tcg_out8(s, OPC_JMP_long);
tcg_out32(s, args[0] - (tcg_target_long)s->code_ptr - 4);
} else {
tcg_out_modrm(s, 0xff, 4, args[0]);
/* jmp *reg */
tcg_out_modrm(s, 0xff, EXT_JMPN_Ev, args[0]);
}
break;
case INDEX_op_br:
@ -1341,7 +1349,7 @@ void tcg_target_qemu_prologue(TCGContext *s)
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 */
tcg_out_modrm(s, 0xff, EXT_JMPN_Ev, TCG_REG_EAX); /* jmp *%eax */
/* TB epilogue */
tb_ret_addr = s->code_ptr;