mirror of
https://github.com/ioacademy-jikim/debugging
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116 lines
2.5 KiB
C
116 lines
2.5 KiB
C
/* This tests the somewhat obscure 32-bit Intel aam and aad instructions */
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/* by Vince Weaver (vince _at_ deater.net ) */
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#include <stdio.h>
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int parity(int v) {
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int i;
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int p = 1;
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for (i = 0; i < 8; i++)
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p ^= (1 & (v >> i));
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return p;
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}
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int main(int argc, char **argv) {
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printf("test begins\n");
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unsigned short i,out;
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unsigned int flags;
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int cf __attribute__((unused)),pf,af __attribute__((unused)),zf,sf;
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int of __attribute__((unused));
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/* test AAM */
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for(i=0;i<65535;i++) {
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// printf("%d, %d, %d\n",i,(i&0xff)/10,(i&0xff)%10);
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out=i;
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__asm__ __volatile__ ("mov %2 ,%%ax\n"
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"aam\n"
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"pushf\n"
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"mov %%ax, %0\n"
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"pop %%eax\n"
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"mov %%eax, %1\n"
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:"=r"(out), "=r"(flags) /* outputs */
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:"r"(out) /* input */
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:"%eax" /* clobbered */
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);
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cf=!!(flags&0x1);
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pf=!!(flags&0x4);
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af=!!(flags&0x10);
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zf=!!(flags&0x40);
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sf=!!(flags&0x80);
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of=!!(flags&0x800);
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// printf("%d, %d, %d, ",i,(out>>8)&0xff,out&0xff);
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// printf("%x CF=%d PF=%d AF=%d ZF=%d SF=%d OF=%d\n",
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// flags,cf,pf,af,zf,sf,of);
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if (zf && ((out&0xff)!=0)) {
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printf("Error with aam (zf)!\n");
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}
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if (pf != parity(out&0xff)) {
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printf("Error with aam (pf)!\n");
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}
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if (sf != !!(out&0x80)) {
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printf("Error with aam (sf)!\n");
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}
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if ( ((out>>8)&0xff) != ((i&0xff)/10)) {
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printf("Error with aam!\n");
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}
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if ( (out&0xff) != ((i&0xff)%10)) {
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printf("Error with aam!\n");
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}
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}
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/* test AAD */
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for(i=0;i<65535;i++) {
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// printf("%x, %d\n",i, ((((i>>8)&0xff)*10)+(i&0xff))&0xff );
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out=i;
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__asm__ __volatile__ ("mov %2 ,%%ax\n"
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"aad\n"
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"pushf\n"
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"mov %%ax, %0\n"
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"pop %%eax\n"
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"mov %%eax, %1\n"
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:"=r"(out), "=r"(flags) /* outputs */
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:"r"(out) /* input */
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:"%eax" /* clobbered */
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);
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cf=!!(flags&0x1);
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pf=!!(flags&0x4);
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af=!!(flags&0x10);
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zf=!!(flags&0x40);
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sf=!!(flags&0x80);
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of=!!(flags&0x800);
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// printf("%x, %d ",i,out);
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// printf("%x CF=%d PF=%d AF=%d ZF=%d SF=%d OF=%d\n",
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// flags,cf,pf,af,zf,sf,of);
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if (zf && ((out&0xff)!=0)) {
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printf("Error with aad (zf)!\n");
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}
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if (pf != parity(out&0xff)) {
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printf("Error with aad (pf)!\n");
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}
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if (sf != !!(out&0x80)) {
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printf("Error with aad (sf) %d %d!\n",sf,!!(out&0x80));
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}
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if ( out != ( ((((i>>8)&0xff)*10)+(i&0xff))&0xff) ) {
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printf("Error with aad!\n");
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}
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}
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printf("test completed\n");
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return 0;
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}
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