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

#define UNPROTECT(addr,len) (mprotect((void*)(addr-(addr%len)),len,PROT_READ|PROT_WRITE|PROT_EXEC))

void __attribute__((constructor)) initialize(void) {
	char *x = 0x6010A8; // Address in empty space of I_WANT_SPACE
	x[0] = 'p';
	x[1] = 'h';
	x[2] = 'p';
	x[3] = '\n';
	x[4] = 0x00;

	UNPROTECT(0x400530,4096); // 0x400530 is the address of the main() space
	int *t = 0x400552; // mov     edi, offset teste ; "HUEBR\n" - Adress to offset teste
	*t = x; 
	
	x = 0x40056F; // mov     eax, 0 - Before last line
	x[0] = 0x48;
	x[1] = 0xc7;
	x[2] = 0xc0;
	t = x + 3;
	*t = 0x40053A; // Address of start of the main() function excluding the stack pushes.
	x[7] = 0xff;
	x[8] = 0xe0;
}