initial commitHEADmaster

1 files changed, 49 insertions, 0 deletions

diff --git a/src/Instruction.cpp b/src/Instruction.cpp
new file mode 100644
index 0000000..c74139b
--- /dev/null
+++ b/src/Instruction.cpp
@@ -0,0 +1,49 @@
+#include "Instruction.h"
+
+#include "Exceptions.h"
+
+namespace x86 { 
+  std::string Register2Str(x86::Register reg) {
+    switch(reg){
+    case x86::Register::EAX:    return "EAX";
+    case x86::Register::ECX:    return "ECX";      
+    case x86::Register::EDX:    return "EDX";      
+    case x86::Register::EBX:    return "EBX";      
+    case x86::Register::ESP:    return "ESP";      
+    case x86::Register::EBP:    return "EBP";      
+    case x86::Register::ESI:    return "ESI";      
+    case x86::Register::EDI:    return "EDI";      
+    }
+    throw std::runtime_error("Register not found!");
+  }
+
+  SIB ProcessSIB(uint8_t sib) {
+    uint8_t scale_mask = 0b11000000;
+    uint8_t index_mask = 0b00111000;
+    uint8_t base_mask  = 0b00000111;
+
+    uint8_t scale = (sib & scale_mask) >> 6;
+    uint8_t index = (sib & index_mask) >> 3;
+    uint8_t base = sib & base_mask;
+
+    if(index == 4) index = x86::Register::SIB_NONE;
+    if(base == 4)  base  = x86::Register::SIB_DISP;
+
+    return {.m_Scale = scale, .m_Index = (x86::Register)index, .m_Base = (x86::Register)base};	  
+  }
+}
+
+std::string Opcode2Str(Opcode op) {
+  switch(op) {
+  case Opcode::INVALID:                    return "INVALID";
+  case Opcode::ADD_RM32_R32:               return "ADD_RM32_R32";
+  case Opcode::ADD_R32_RM32:               return "ADD_R32_RM32";
+  case Opcode::MOV_R32_IMM32 ... 0xBF:     return "MOV_R32_IMM32";
+  case Opcode::MOV_RM32_R32:               return "MOV_RM32_R32";
+  case Opcode::NOP:                        return "NOP";
+  case Opcode::HLT:                        return "HLT";
+  }
+
+  std::string what = "Opcode2Str could not find '" + std::to_string(op) + "'!"; 
+  throw CPUException(what);
+}