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 } 63
