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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	void* a;
  5. 	void* b;
  6. 	void* c;
  7. 	a=b=c=NULL;
  8. 	__asm__ volatile (
  9. 		"mov %%esp,%%eax\n\t"
  10. 		"push %%eax\n\t"
  11. 		"mov %%esp,%%ebx\n\t"
  12. 		"pop %%eax\n\t"
  13. 		"mov %%esp,%%ecx\n\t"
  14. 		"mov %%eax,%0\n\t"
  15. 		"mov %%ebx,%1\n\t"
  16. 		"mov %%ecx,%2\n\t"
  17. 	: "=m"(a),"=m"(b),"=m"(c)
  18. 	::"%eax","%ebx","%ecx");
  19. 	printf("%p\n%p\n%p\n",a,b,c);
  20. 	putchar('\n');
  21. 	a=b=c=NULL;
  22. 	__asm__ volatile (
  23. 		"mov %%esp,%0\n\t"
  24. 		"push %%eax\n\t"
  25. 		"mov %%esp,%1\n\t"
  26. 		"pop %%eax\n\t"
  27. 		"mov %%esp,%2\n\t"
  28. 	: "=m"(a),"=m"(b),"=m"(c)
  29. 	::);
  30. 	printf("%p\n%p\n%p\n",a,b,c);
  31. 	putchar('\n');
  32. 	a=b=NULL;
  33. 	__asm__ volatile (
  34. 		"mov %%esp,%0\n\t"
  35. 		"push %%eax\n\t"
  36. 		"lea %1,%%ebx\n\t"
  37. 		"pop %%eax\n\t"
  38. 		"mov %%ebx,%0\n\t"
  39. 	: "=m"(a),"=m"(b)
  40. 	::"%ebx");
  41. 	printf("%p\n%p\n",a,&b);
  42. 	return 0;
  43. }
  44.  
Success #stdin #stdout 0s 2248KB
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0xbffceb60
0xbffceb5c
0xbffceb60

0xbffceb5c
(nil)
0xbffceb60

0xbffceb74
0xbffceb78
https://ideone.com/nIfolQ
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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