memcheck/tests/x86/pushpopmem.c

   1
   2 #include <assert.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5
   6 unsigned int do32 ( unsigned int x )
   7 {
   8   unsigned int* y = malloc(sizeof(unsigned int));
   9   unsigned int* z = malloc(sizeof(unsigned int));
  10   unsigned int t;
  11   assert(y);
  12   assert(z);
  13   y[0] = x;
  14   __asm__ __volatile__(
  15      "pushl %0\n\t"
  16      "pushl %1\n\t"
  17      "popl %%ebx\n\t"
  18      "popl %%eax\n\t"
  19      "pushl 0(%%eax)\n\t"
  20      "popl 0(%%ebx)"
  21      : /*OUT*/
  22      : /*IN*/ "r"(y), "r"(z)
  23      : /*TRASH*/ "memory", "eax", "ebx"
  24   );
  25   t = z[0];
  26   free(y);
  27   free(z);
  28   return t;
  29 }
  30
  31 unsigned short do16 ( unsigned short x )
  32 {
  33   unsigned short* y = malloc(sizeof(unsigned short));
  34   unsigned short* z = malloc(sizeof(unsigned short));
  35   unsigned short t;
  36   assert(y);
  37   assert(z);
  38   y[0] = x;
  39   __asm__ __volatile__(
  40      "pushl %0\n\t"
  41      "pushl %1\n\t"
  42      "popl %%ebx\n\t"
  43      "popl %%eax\n\t"
  44      "pushw 0(%%eax)\n\t"
  45      "popw 0(%%ebx)"
  46      : /*OUT*/
  47      : /*IN*/ "r"(y), "r"(z)
  48      : /*TRASH*/ "memory", "eax", "ebx"
  49   );
  50   t = z[0];
  51   free(y);
  52   free(z);
  53   return t;
  54 }
  55
  56
  57 int main ( void )
  58 {
  59    printf("do32: 0x%08X\n", do32(0xCafeBabe) );
  60    printf("do16: 0x%08X\n", (unsigned int)do16(0xfeBa) );
  61    return 0;
  62 }