c_cpp 你好ç

Posted 2021-05-14

#include <stdio.h>
int main(int argc, char const* argv[])
{
    printf("Hello World!\n");
    return 0;
}

#define INLINE_SYSCALL(name, nr, args...) \
  ({                                          \
    unsigned int resultvar = INTERNAL_SYSCALL (name, , nr, args);         \
    if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (resultvar, )))        \
      {                                       \
    __set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, ));           \
    resultvar = 0xffffffff;                           \
      }                                       \
    (int) resultvar; })

  
# define INTERNAL_SYSCALL(name, err, nr, args...) \
  ({                                          \
    register unsigned int resultvar;                          \
    EXTRAVAR_##nr                                 \
    asm volatile (                                \
    LOADARGS_##nr                                 \
    "movl %1, %%eax\n\t"                              \
    "int $0x80\n\t"                               \
    RESTOREARGS_##nr                                  \
    : "=a" (resultvar)                                \
    : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc");              \
    (int) resultvar; })

/*
 * # define LOADARGS_3 \
 *     "xchgl %%ebx, %%edi\n\t"
 *
 * # define RESTOREARGS_3 \
 *     "xchgl %%edi, %%ebx\n\t"
 *
 *  __NR_execve = 11 (unistd.h)
 *
 * # define ASMFMT_3(arg1, arg2, arg3) \
 * , "b" (arg1), "c" (arg2), "d" (arg3)
 */