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Update cmp_rm32_r32(0x89) instruction

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tuz358
2018-03-16 15:26:59 +09:00
parent f6a63b323a
commit 7ff08d268c
1 changed files with 18 additions and 74 deletions
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62
instructions.cpp
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@@ -184,9 +184,7 @@ void Instructions::calc_rm32_r32_case0to2(uint32_t addr, uint32_t dst, int calc_
case AND: memory.write_uint32(addr, dst & this->registers[this->R]); break;
case SUB: memory.write_uint32(addr, dst - this->registers[this->R]); break;
case XOR: memory.write_uint32(addr, dst ^ this->registers[this->R]); break;
case CMP:
// TODO: implement
break;
case CMP: set_flag(!(dst - this->registers[this->R]), ZF); break;
default: break;
}
}
@@ -249,9 +247,7 @@ void Instructions::calc_r32_rm32(uint32_t *dst, uint32_t *src, int calc_type){
case AND: *dst &= *src; break;
case SUB: *dst -= *src; break;
case XOR: *dst ^= *src; break;
case CMP:
// TODO: implement
break;
case CMP: set_flag(!(dst - this->registers[this->R]), ZF); break;
default: break;
}
}
@@ -302,59 +298,7 @@ void Instructions::xor_rm32_r32() { this->template_rm32_r32(XOR); }
void Instructions::xor_r32_rm32() { this->template_r32_rm32(XOR); }
void Instructions::xor_eax_imm32(){ this->template_eax_imm32(XOR); }
void Instructions::cmp_rm32_r32(){
//printf("cmp_rm32_r32 called.\n");
uint32_t addr, dst, imm32, result;
uint8_t imm8;
this->modrm = memory.read_uint8(this->eip);
this->calc_modrm();
switch (this->mod) {
case 0:
// cmp [M], R
// addr : M
this->eip++;
addr = this->registers[this->M];
// dst : data of [M]
dst = memory.read_uint32(addr);
result = dst - this->registers[this->R];
set_flag(!result, ZF);
break;
case 1:
// cmp [M+imm8], R
this->eip++;
imm8 = memory.read_uint8(this->eip);
// addr : M
addr = this->registers[this->M];
// dst : data of [M+imm8]
dst = memory.read_uint32(addr + imm8);
result = dst - this->registers[this->R];
set_flag(!result, ZF);
break;
case 2:
// cmp [M+imm32], R
this->eip++;
imm32 = memory.read_uint32(this->eip);
imm32 = swap_endian32(imm32);
// addr : M
addr = this->registers[this->M];
// dst : data of [M+imm32]
dst = memory.read_uint32(addr + imm32);
result = dst - this->registers[this->R];
set_flag(!result, ZF);
this->eip += 4;
break;
default:
// case mod == 3
// cmp M, R
this->eip++;
result = this->registers[this->M] - this->registers[this->R];
set_flag(!result, ZF);
break;
}
}
void Instructions::cmp_rm32_r32() { this->template_rm32_r32(CMP); }
void Instructions::cmp_eax_imm32(){ this->template_eax_imm32(CMP); }
void Instructions::inc_eax(){ this->registers[0]++; }