Studium/Hardwarenahe_Programmierung
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a5: Flags ausgelesen

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This commit is contained in:
Johannes Theiner 2019-01-03 10:26:05 +01:00
parent 7654da783f
commit d14a041061
3 changed files with 23 additions and 17 deletions
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1
.gitignore vendored
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@ -6,6 +6,7 @@ CMakeFiles
*.cmake
CMakeCache.txt
Makefile
!/src/c/a5/Makefile
Hardwarenahe_Programmierung.cbp
*~
*.[oa]

8
src/c/a5/addsub.asm
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@ -30,14 +30,10 @@ return:
pop edx;Flagregister in edx schreiben
;FIXME: Hier wird an die falsche Stelle oder so geschrieben
mov ebx, [ebp+20]
mov [ebx], edx
;mov [ebp+20], edx;Flagregister aus edx in flags ptr aus C kopieren
;mov word[ebp+24], 32
pop edx
pop ecx
@ -47,6 +43,4 @@ return:
pop ebp
ret
section .data
temp dw 0
section .data

31
src/c/a5/flagtest.c
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@ -26,9 +26,12 @@ int main(int argc, char **argv) {
int op2 = atoi(argv[3]);
char what = *argv[2];
signed short sop1 = (short) op1;
signed short sop2 = (short) op2;
unsigned short uop1 = (unsigned short) op1;
unsigned short uop2 = (unsigned short) op2;
unsigned int *flags = malloc(sizeof(unsigned int));
//TODO: DEBUG Statement, remove later
*flags = 42;
int result = addsub(op1, op2, what, flags);
@ -38,22 +41,30 @@ int main(int argc, char **argv) {
printf("Flags:\n");
printf("O D I T S Z A P C\n");
int flagArray[12];
/*
* TODO: Interpretation wenn Fehler im ASM behoben
* https://stackoverflow.com/a/9361069
*/
printf("%u\n\n", *flags);
printf("%p\n", flags);
for(int i = 0; i < 12; ++i) {
flagArray[i] = *flags % 2;
*flags = *flags / 2;
}
for(int i = 12; i > 0; --i) {
printf("%d ", flagArray[i-1]);
}
printf("\n\n");
printf("Ergebnis und Operanden Signed:\n");
printf("%d %c %d = %d", op1, what, op2, signedRes);
printf("%d %c %d = %d", sop1, what, sop2, signedRes);
printf("\n\n");
printf("Ergebnis und Operanden Unsigned:\n");
printf("%d %c %d = %u", op1, what, op2, unsignedRes);
printf("%u %c %u = %u", uop1, what, uop2, unsignedRes);
printf("\n\n");