first commit

instructions.cpp

@@ -0,0 +1,41 @@
+#include "include/instructions.h"
+
+void Instructions::init(uint32_t eip, uint32_t esp){
+  // initialize general purpose registers
+  this->eax = 0;
+  this->ecx = 0;
+  this->edx = 0;
+  this->ebx = 0;
+  this->esp = esp;
+  this->ebp = 0;
+  this->esi = 0;
+  this->edi = 0;
+
+  // initialize eflags register
+  this->eflags = 0;
+
+  // initialize instruction pointer
+  this->eip = eip;
+
+  this->init_instructions();
+}
+
+void Instructions::init_instructions(){
+  memset(this->instructions, 0, sizeof(this->instructions));
+
+  this->instructions[0x90] = &Instructions::nop;
+  this->instructions[0xf4] = &Instructions::hlt;
+}
+
+void Instructions::execute_opcode(uint8_t opcode){
+  (this->*instructions[opcode])();
+}
+
+void Instructions::nop(){
+  printf("nop called.\n");
+}
+
+void Instructions::hlt(){
+  printf("hlt called.\n");
+  this->eip = 0x00;
+}