main.c

#include <stdlib.h>
#include <stdio.h>
#include "x86_decoder.h"

//MOV
//                        100 - rsp 111 - rdi (mov rdi to rsp)
//    0100 1000 1000 1001 1110 0111
//         1R0B 1000 1001 11          - qwordreg 1 to qwordreg2
//         

// 64 bit 
void test1(unsigned char * bytes){
    int i = 0;
    for(i = 0; i< 3; i++)
        printf("%x ", bytes[i]);
    printf("\n");
    decode_x86_inst(bytes, 64);
}

int main(){
    unsigned char * bytes = (unsigned char *) malloc(sizeof(unsigned char) * MAX_INSTR_LEN);
    if(bytes == NULL){
        printf("malloc failed in main()\n");
        return -1;
    }
    
    // REG.W, mov op, and modrm registers
    bytes[0] = 0x48;
    bytes[1] = 0x89;
    bytes[2] = 0xe7;
    test1(bytes);
    printf("mov rdi, rsp\n");

    // call op and displacement 
    bytes[0] = 0xe8;
    bytes[1] = 0x08;
    bytes[2] = 0x0e;
    test1(bytes);
    printf("call 0xe0d\n");

    // call op and 64 bit negative displacement 
    bytes[0] = 0xe8;
    bytes[1] = 0x08;
    bytes[2] = 0x0e;
    bytes[3] = 0x0;
    bytes[4] = 0xff;
    test1(bytes);
    printf("call 0xffffffffff000e0d\n");

    // call op and 64 bit positive displacement 
    bytes[0] = 0xe8;
    bytes[1] = 0x08;
    bytes[2] = 0x0e;
    bytes[3] = 0x0;
    bytes[4] = 0x7f;
    test1(bytes);
    printf("call 0x7f000e0d\n");

    // rdtsc has imm8
    bytes[0] = 0xf;
    bytes[1] = 0x31;
    bytes[2] = 0x0e;
    test1(bytes);
    printf("rdtsc\n");

    bytes[0] = 0x40;
    bytes[1] = 0x55;
    bytes[2] = 0x0e;
    test1(bytes);
    printf("push rbp\n");

    bytes[0] = 0x48;
    bytes[1] = 0x89;
    bytes[2] = 0xe5;
    test1(bytes);
    printf("mov rbp, rsp\n");

    bytes[0] = 0x41;
    bytes[1] = 0x57;
    bytes[2] = 0xe5;
    test1(bytes);
    printf("push r15\n");

    bytes[0] = 0x89;
    bytes[1] = 0xc0;
    bytes[2] = 0xe5;
    test1(bytes);
    printf("mov eax, eax\n");

    return 0;
}