Hello World schell code using mmap

hwshellcode.c

// gcc hwshellcode.c -o hwshellcode

#include <stdio.h>
#include <sys/mman.h>
#include <string.h>
#include <stdlib.h>

int (*sc)();

/*
00000000  EB1E              jmp short 0x20
00000002  B801000000        mov eax,0x1
00000007  BF01000000        mov edi,0x1
0000000C  5E                pop rsi
0000000D  BA0C000000        mov edx,0xc
00000012  0F05              syscall
00000014  B83C000000        mov eax,0x3c
00000019  BF00000000        mov edi,0x0
0000001E  0F05              syscall
00000020  E8DDFFFFFF        call 0x2
00000025  48656C6C6F20576F726C640A Hello World\r\n
*/

const unsigned char code[] = {
  0xeb, 0x1e, 0xb8, 0x01, 0x00, 0x00, 0x00, 0xbf, 0x01, 0x00, 0x00, 0x00,
  0x5e, 0xba, 0x0c, 0x00, 0x00, 0x00, 0x0f, 0x05, 0xb8, 0x3c, 0x00, 0x00,
  0x00, 0xbf, 0x00, 0x00, 0x00, 0x00, 0x0f, 0x05, 0xe8, 0xdd, 0xff, 0xff,
  0xff, 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64,
  0x0a
};


int main(int argc, char** argv){
    void *ptr = mmap(0, sizeof(code), PROT_EXEC | PROT_WRITE | PROT_READ, MAP_ANON | MAP_PRIVATE, -1, 0);
    if (ptr == MAP_FAILED){
        perror("[ - ] mmap failed");
        exit(-1);
    }

    memcpy(ptr, code, sizeof(code));
    sc = ptr;

    sc();
    
    return 0;
}