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Add add_rm32_r32(0x01) instruction

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tuz358
2018-03-05 08:34:42 +09:00
parent bf7fa49eee
commit d4ec188ef1
2 changed files with 52 additions and 0 deletions
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1
include/instructions.h
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@@ -23,6 +23,7 @@ public:
void calc_modrm();
void execute_opcode(uint8_t opcode);
void add_rm32_r32(); // 0x01
void xor_rm32_r32(); // 0x31
void mov_rm32_r32(); // 0x89
void nop(); // 0x90

51
instructions.cpp
View File

@@ -20,6 +20,7 @@ void Instructions::init(uint32_t eip, uint32_t esp, Memory memory){
void Instructions::init_instructions(){
memset(this->instructions, 0, sizeof(this->instructions));
this->instructions[0x01] = &Instructions::add_rm32_r32;
this->instructions[0x31] = &Instructions::xor_rm32_r32;
this->instructions[0x89] = &Instructions::mov_rm32_r32;
this->instructions[0x90] = &Instructions::nop;
@@ -46,6 +47,56 @@ void Instructions::execute_opcode(uint8_t opcode){
(this->*instructions[opcode])();
}
void Instructions::add_rm32_r32(){
printf("add_rm32_r32 called.\n");
uint32_t addr, dst, imm32;
uint8_t imm8;
this->modrm = memory.read_uint8(this->eip);
this->calc_modrm();
switch (this->mod) {
case 0:
// add [M], R
// addr : M
this->eip++;
addr = this->registers[this->M];
// dst : data of [M]
dst = memory.read_uint32(addr);
memory.write_uint32(addr, dst + this->registers[this->R]);
break;
case 1:
// add [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);
memory.write_uint32(addr + imm8, dst + this->registers[this->R]);
this->eip++;
break;
case 2:
// add [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); // error
memory.write_uint32(addr, dst + this->registers[this->R]);
this->eip += 4;
break;
default:
// case mod == 3
// add M, R
this->eip++;
this->registers[this->M] += this->registers[this->R];
break;
}
}
void Instructions::xor_rm32_r32(){
printf("xor_rm32_r32 called.\n");
uint32_t addr, dst, imm32;