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Fixed the IDIV instructions on 286+ again, this time properly, fixes hang with the NCR 53C810 BIOS v4.0x.

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OBattler
2017-12-14 03:33:07 +01:00
parent ed384101fd
commit 28426e53af
2 changed files with 115 additions and 83 deletions
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40
src/cpu/386_dynarec.c
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@@ -463,28 +463,30 @@ int divl(uint32_t val)
}
int idivl(int32_t val)
{
int64_t num, quo;
int32_t rem, quo32;
uint64_t tempsrc;
int64_t tempws, tempws2 = 0;
if (val==0)
{
divexcp();
return 1;
}
if (val == 0) {
divexcp(); /* Divide by zero. */
return 1;
}
num=(((uint64_t)EDX)<<32)|EAX;
quo=num/val;
rem=num%val;
quo32=(int32_t)(quo&0xFFFFFFFF);
tempsrc = (uint64_t) EDX;
tempsrc = (tempsrc << 32) | EAX;
tempws = ((int64_t)tempsrc) / ((int64_t)((int32_t)val));
if ((quo > 0x000000007FFFFFFFLL) || (quo < 0xFFFFFFFF80000000LL))
{
divexcp();
return 1;
}
EDX=rem;
EAX=quo32;
return 0;
if ((tempws > 2147483647LL) || (tempws < -2147483648LL)) {
divexcp();
return 1;
}
tempws = (int32_t) tempws;
tempws2 = (int32_t) ((int64_t)tempsrc) % ((int64_t)((int32_t)val));
DX = (uint32_t) tempws2;
AX = (uint32_t) tempws;
return 0;
}