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  1. #include <stdio.h>
  2.  
  3. unsigned int hoge(void);
  4. __asm__(
  5.     "hoge:\n\t"
  6.     "pushl %ebx\n\t"
  7.  
  8.     "subl    $4,      %esp # allocate a buffer\n\t"
  9.     "leal    1(%esp), %ebx\n\t"
  10.     "pushl   %ebx          # where to store the second character\n\t"
  11.     "decl    %ebx\n\t"
  12.     "pushl   %ebx          # where to store the first character\n\t"
  13.     "pushl   $str1\n\t"
  14.     "call    scanf\n\t"
  15.     "add     $12,     %esp # discard the arguments\n\t"
  16.     "movzwl  (%esp),  %ebx\n\t"
  17.     "addl    $4,      %esp # discard the buffer\n\t"
  18.  
  19.  
  20.     "movl %ebx, %eax\n\t"
  21.     "popl %ebx\n\t"
  22.     "ret\n\t"
  23.  
  24.     "# put this where won't be executed\n\t"
  25.     "str1: .asciz \"%c %c\"\n\t"
  26. );
  27.  
  28. int main(void) {
  29.     printf("%x\n",hoge());
  30. 	return 0;
  31. }
  32.  
Success #stdin #stdout 0s 2164KB
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https://ideone.com/pNCqxa
language:
C (gcc 8.3)
created:
8 years ago
visibility:
secret

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