代码

typedef unsigned long U;
static U duck;

U getauxval(U key) { (void)key; return duck; }
int plus(int a, int b) { return a + b; }

__attribute__((noreturn))
void __libc_start_main(int (*entry)(int, char **, char **), int argc, char **argv) {
    duck = ((U *)argv)[29];
    entry(argc, argv, (char **)0);
    __asm__ volatile("mov $60,%%eax;xor %%edi,%%edi;syscall"
                     ::: "rax", "rdi", "rcx", "r11", "memory");
    __builtin_unreachable();
}

评测结果