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Add FSUB/FSUBP/FISUB operator for x86 assembler (Subtract)

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emvivre 2018-01-07 11:30:22 +01:00 committed by radare
parent 65a71bcaed
commit ab3ff60f2e
1 changed files with 86 additions and 0 deletions
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86
libr/asm/p/asm_x86_nz.c
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@ -2979,6 +2979,89 @@ static int opfimul(RAsm *a, ut8 *data, const Opcode *op) {
return l;
}
static int opfsub(RAsm *a, ut8 *data, const Opcode *op) {
int l = 0;
switch (op->operands_count) {
case 1:
if ( op->operands[0].type & OT_MEMORY ) {
if ( op->operands[0].type & OT_DWORD ) {
data[l++] = 0xd8;
data[l++] = 0x20 | op->operands[0].regs[0];
} else if ( op->operands[0].type & OT_QWORD ) {
data[l++] = 0xdc;
data[l++] = 0x20 | op->operands[0].regs[0];
} else {
return -1;
}
} else {
return -1;
}
break;
case 2:
if ( op->operands[0].type & OT_FPUREG & ~OT_REGALL && op->operands[0].reg == 0 &&
op->operands[1].type & OT_FPUREG & ~OT_REGALL ) {
data[l++] = 0xd8;
data[l++] = 0xe0 | op->operands[1].reg;
} else if ( op->operands[0].type & OT_FPUREG & ~OT_REGALL &&
op->operands[1].type & OT_FPUREG & ~OT_REGALL && op->operands[1].reg == 0 ) {
data[l++] = 0xdc;
data[l++] = 0xe0 | op->operands[0].reg;
} else {
return -1;
}
break;
default:
return -1;
}
return l;
}
static int opfsubp(RAsm *a, ut8 *data, const Opcode *op) {
int l = 0;
switch (op->operands_count) {
case 0:
data[l++] = 0xde;
data[l++] = 0xe9;
break;
case 2:
if ( op->operands[0].type & OT_FPUREG & ~OT_REGALL &&
op->operands[1].type & OT_FPUREG & ~OT_REGALL && op->operands[1].reg == 0 ) {
data[l++] = 0xde;
data[l++] = 0xe8 | op->operands[0].reg;
} else {
return -1;
}
break;
default:
return -1;
}
return l;
}
static int opfisub(RAsm *a, ut8 *data, const Opcode *op) {
int l = 0;
switch (op->operands_count) {
case 1:
if ( op->operands[0].type & OT_MEMORY ) {
if ( op->operands[0].type & OT_DWORD ) {
data[l++] = 0xda;
data[l++] = 0x20 | op->operands[0].regs[0];
} else if ( op->operands[0].type & OT_WORD ) {
data[l++] = 0xde;
data[l++] = 0x20 | op->operands[0].regs[0];
} else {
return -1;
}
} else {
return -1;
}
break;
default:
return -1;
}
return l;
}
typedef struct lookup_t {
char mnemonic[12];
int only_x32;
@ -3087,6 +3170,7 @@ LookupTable oplookup[] = {
{"fimul", 0, &opfimul, 0},
{"fincstp", 0, NULL, 0xd9f7, 2},
{"finit", 0, NULL, 0x9bdbe3, 3},
{"fisub", 0, &opfisub, 0},
{"fist", 0, &opfist, 0},
{"fistp", 0, &opfistp, 0},
{"fisttp", 0, &opfisttp, 0},
@ -3116,6 +3200,8 @@ LookupTable oplookup[] = {
{"fsincos", 0, NULL, 0xd9fb, 2},
{"fsqrt", 0, NULL, 0xd9fa, 2},
{"fstenv", 0, &opfstenv, 0},
{"fsub", 0, &opfsub, 0},
{"fsubp", 0, &opfsubp, 0},
{"ftst", 0, NULL, 0xd9e4, 2},
{"fucom", 0, &opfucom, 0},
{"fucomp", 0, &opfucomp, 0},