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Add opcode_ff(0xff) instruction

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tuz358
2018-03-05 10:22:31 +09:00
parent 1ce883a1a0
commit 47352b68f2
2 changed files with 22 additions and 0 deletions
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1
include/instructions.h
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@@ -32,4 +32,5 @@ public:
void mov_ebx_imm32(); // 0xbb void mov_ebx_imm32(); // 0xbb
void jmp_imm8(); // 0xeb void jmp_imm8(); // 0xeb
void hlt(); // 0xf4 void hlt(); // 0xf4
void opcode_ff(); // 0xff
}; };

21
instructions.cpp
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@@ -29,6 +29,7 @@ void Instructions::init_instructions(){
this->instructions[0xbb] = &Instructions::mov_ebx_imm32; this->instructions[0xbb] = &Instructions::mov_ebx_imm32;
this->instructions[0xeb] = &Instructions::jmp_imm8; this->instructions[0xeb] = &Instructions::jmp_imm8;
this->instructions[0xf4] = &Instructions::hlt; this->instructions[0xf4] = &Instructions::hlt;
this->instructions[0xff] = &Instructions::opcode_ff;
} }
void Instructions::init_modrm(){ void Instructions::init_modrm(){
@@ -230,3 +231,23 @@ void Instructions::hlt(){
printf("hlt called.\n"); printf("hlt called.\n");
this->eip = 0x00; this->eip = 0x00;
} }
void Instructions::opcode_ff(){
printf("opcode_ff called.\n");
this->modrm = memory.read_uint8(this->eip);
this->calc_modrm();
switch (this->R) {
case 0:
// TODO: add inc_r32() function
// this->execute_opcode(0x40+this->M)
break;
case 1:
this->execute_opcode(0x48+this->M); // dec r32
this->eip++;
break;
default:
break;
}
}