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Refactor: Seperate executor cases to categories.

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0x221E
2026-02-05 00:42:25 +01:00
parent fe1370359e
commit ac6bf8cb46
15 changed files with 127 additions and 69 deletions
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66
src/ExecutorCases.cpp
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@@ -1,5 +1,10 @@
#include "ExecutorCases.h"
#include "DataTransfer.h"
#include "ControlFlow.h"
#include "Arithmetic.h"
#include "Misc.h"
#include "Instruction.h"
#include "Bus.h"
@@ -10,70 +15,11 @@ CPUContext::CPUContext(Instruction& i, uint32_t& ip, uint32_t& flags, uint32_t*
CPUContext::~CPUContext() = default;
// NO SIB SUPPORT YET
namespace executor_cases {
void Nop(CPUContext& cc){
std::cout << "No op" << std::endl;
}
void Hlt(CPUContext& cc){
std::cout << "Program halted!" << std::endl;
exit(0);
}
void Mov_r32_imm32(CPUContext& cc){
cc.m_Registers[cc.m_Instruction.m_Operand1] = cc.m_Instruction.m_Operand2;
}
void Add_rm32_r32(CPUContext& cc){
x86::ModRM modrm = cc.m_Instruction.optional.m_ModRM;
switch(modrm.m_State) {
case x86::ModRMState::R:
{
cc.m_Registers[modrm.m_Rm] += cc.m_Registers[modrm.m_Reg];
break;
}
case x86::ModRMState::LR:
{
uint32_t dstPrevValue = cc.m_Bus->AccessX<uint32_t>(cc.m_Registers[modrm.m_Rm]);
uint32_t currRegValue = cc.m_Registers[modrm.m_Reg];
uint32_t result = dstPrevValue + currRegValue;
cc.m_Bus->WriteX<uint32_t>(cc.m_Registers[modrm.m_Rm], result);
break;
}
case x86::ModRMState::LR_DISP8:
case x86::ModRMState::LR_DISP32:
{
uint32_t dstAddress = cc.m_Registers[modrm.m_Rm] + cc.m_Instruction.m_Operand1;
uint32_t dstPrevValue = cc.m_Bus->AccessX<uint32_t>(dstAddress);
uint32_t currRegValue = cc.m_Registers[modrm.m_Reg];
uint32_t result = dstPrevValue + currRegValue;
cc.m_Bus->WriteX<uint32_t>(dstAddress, result);
break;
}
case x86::ModRMState::DISP32:
{
uint32_t dstAddress = cc.m_Instruction.m_Operand1;
uint32_t dstPrevValue = cc.m_Bus->AccessX<uint32_t>(dstAddress);
uint32_t currRegValue = cc.m_Registers[modrm.m_Reg];
uint32_t result = dstPrevValue + currRegValue;
cc.m_Bus->WriteX<uint32_t>(dstAddress, result);
break;
}
default:
{
throw std::runtime_error("Invalid ModRM State encountered during Add_rm32_r32");
}
}
}
}
constexpr std::array<ExecutorCase, 255> GenerateExecutorTable(){
std::array<ExecutorCase, 255> table{};
table[Opcode::NOP] = executor_cases::Nop;
table[Opcode::HLT] = executor_cases::Hlt;
table[Opcode::MOV_R_IMM32] = executor_cases::Mov_r32_imm32;
table[Opcode::MOV_R32_IMM32] = executor_cases::Mov_r32_imm32;
table[Opcode::ADD_RM32_R32] = executor_cases::Add_rm32_r32;
return table;
}