Mirrors/cpu-emulator
1
0
Fork 0
mirror of https://github.com/tuz358/cpu-emulator.git synced 2025-12-18 13:04:35 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

Add mov_rm32_r32(0x89) instruction

Browse Source
This commit is contained in:
tuz358
2018-03-04 23:02:14 +09:00
parent 27a7d866d2
commit bf7fa49eee
2 changed files with 46 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
include/instructions.h
View File

@@ -24,6 +24,7 @@ public:
void execute_opcode(uint8_t opcode); void execute_opcode(uint8_t opcode);
void xor_rm32_r32(); // 0x31 void xor_rm32_r32(); // 0x31
void mov_rm32_r32(); // 0x89
void nop(); // 0x90 void nop(); // 0x90
void mov_ecx_imm32(); // 0xb9 void mov_ecx_imm32(); // 0xb9
void mov_ebx_imm32(); // 0xbb void mov_ebx_imm32(); // 0xbb

45
instructions.cpp
View File

@@ -21,6 +21,7 @@ void Instructions::init_instructions(){
memset(this->instructions, 0, sizeof(this->instructions)); memset(this->instructions, 0, sizeof(this->instructions));
this->instructions[0x31] = &Instructions::xor_rm32_r32; this->instructions[0x31] = &Instructions::xor_rm32_r32;
this->instructions[0x89] = &Instructions::mov_rm32_r32;
this->instructions[0x90] = &Instructions::nop; this->instructions[0x90] = &Instructions::nop;
this->instructions[0xb9] = &Instructions::mov_ecx_imm32; this->instructions[0xb9] = &Instructions::mov_ecx_imm32;
this->instructions[0xbb] = &Instructions::mov_ebx_imm32; this->instructions[0xbb] = &Instructions::mov_ebx_imm32;
@@ -94,6 +95,50 @@ void Instructions::xor_rm32_r32(){
} }
} }
void Instructions::mov_rm32_r32(){
printf("mov_rm32_r32 called.\n");
uint32_t addr, imm32;
uint8_t imm8;
this->modrm = memory.read_uint8(this->eip);
this->calc_modrm();
switch (this->mod) {
case 0:
// mov [M], R
// addr : M
this->eip++;
addr = this->registers[this->M];
memory.write_uint32(addr, this->registers[this->R]);
break;
case 1:
// mov [M+imm8], R
this->eip++;
imm8 = memory.read_uint8(this->eip);
// addr : M
addr = this->registers[this->M];
memory.write_uint32(addr + imm8, this->registers[this->R]);
this->eip++;
break;
case 2:
// mov [M+imm32], R
this->eip++;
imm32 = memory.read_uint32(this->eip);
imm32 = swap_endian32(imm32);
// addr : M
addr = this->registers[this->M];
memory.write_uint32(addr, this->registers[this->R]);
this->eip += 4;
break;
default:
// case mod == 3
// mov M, R
this->eip++;
this->registers[this->M] = this->registers[this->R];
break;
}
}
void Instructions::nop(){ void Instructions::nop(){
printf("nop called.\n"); printf("nop called.\n");
} }