tmp

 

 

 

 

extern int shared;
int main() {
    int a = 100;
    swap(&a, &shared);
}

 

 

 

int shared = 1;
void swap(int *a, int *b) {
    *a ^= *b ^= *a ^= *b;
}

 

 

 

 

 

 

char* str = "Hello World!\n";

void print()
{
    asm("movq $13,%%rdx \n\t"
        "movq %0,%%rcx \n\t"
        "movq $0,%%rbx\n\t"
        "movq $4,%%rax \n\t"
        "int $0x80  \n\t"
        ::"r"(str):"rdx","rcx","rbx");
}

void exit()
{
    asm("movq $42,%rbx \n\t"
    "movq $1,%rax \n\t"
    "int $0x80  \n\t"
    );
}

void nomain()
{
    print();
    exit();
}          

 

 

 

ENTRY(nomain)

SECTIONS
{
  . = 0x08048000 + SIZEOF_HEADERS;
  tinytext : { *(.text) *(.data) *(.rodata)}
  /DISCARD/ :{ *(.comment) *(.eh_frame) *(.shstrtab) *(.symtab) *(.strtab)}
}