80486DX2-66/86Box-fork
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The NCR 53C810 is now threaded;

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Reverted my IDIV fixes - fixes font glitches in Windows XP and possibly other things as well;
Slight fix to line repeat detection in pclog_ex().
This commit is contained in:
OBattler
2017-12-16 19:46:07 +01:00
parent 3a32bda6dc
commit 31153f20d4
5 changed files with 506 additions and 264 deletions
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182
src/cpu/x86_ops_misc.h
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@@ -64,9 +64,10 @@ static int opSETALC(uint32_t fetchdat)
static int opF6_a16(uint32_t fetchdat)
{
int32_t tempsrc, tempdst, tempws, tempws2 = 0;
int tempws, tempws2 = 0;
uint16_t tempw, src16;
uint8_t src, dst;
int8_t temps;
fetch_ea_16(fetchdat);
dst = geteab(); if (cpu_state.abrt) return 1;
@@ -130,32 +131,24 @@ static int opF6_a16(uint32_t fetchdat)
PREFETCH_RUN(is486 ? 16 : 14, 2, rmdat, (cpu_mod == 3) ? 0:1,0,0,0, 0);
break;
case 0x38: /*IDIV AL,b*/
if (dst == 0) {
x86_int(0); /* Divide by zero. */
return 1;
}
tempsrc = (int16_t) AX;
tempdst = (int8_t) dst;
tempws = tempsrc / tempdst;
if ((tempws > 127) || (tempws < -128)) {
x86_int(0);
return 1;
}
tempws = (int8_t) tempws;
tempws2 = (int8_t) (tempsrc % tempdst);
AH = (uint8_t) tempws2;
AL = (uint8_t) tempws;
if (!cpu_iscyrix) {
flags_rebuild();
flags|=0x8D5; /*Not a Cyrix*/
}
tempws = (int)(int16_t)AX;
if (dst != 0) tempws2 = tempws / (int)((int8_t)dst);
temps = tempws2 & 0xff;
if (dst && ((int)temps == tempws2))
{
AH = (tempws % (int)((int8_t)dst)) & 0xff;
AL = tempws2 & 0xff;
if (!cpu_iscyrix)
{
flags_rebuild();
flags|=0x8D5; /*Not a Cyrix*/
}
}
else
{
x86_int(0);
return 1;
}
CLOCK_CYCLES(19);
PREFETCH_RUN(19, 2, rmdat, (cpu_mod == 3) ? 0:1,0,0,0, 0);
break;
@@ -168,9 +161,10 @@ static int opF6_a16(uint32_t fetchdat)
}
static int opF6_a32(uint32_t fetchdat)
{
int tempsrc, tempdst, tempws, tempws2 = 0;
int tempws, tempws2 = 0;
uint16_t tempw, src16;
uint8_t src, dst;
int8_t temps;
fetch_ea_32(fetchdat);
dst = geteab(); if (cpu_state.abrt) return 1;
@@ -234,32 +228,24 @@ static int opF6_a32(uint32_t fetchdat)
PREFETCH_RUN(is486 ? 16 : 14, 2, rmdat, (cpu_mod == 3) ? 0:1,0,0,0, 1);
break;
case 0x38: /*IDIV AL,b*/
if (dst == 0) {
x86_int(0); /* Divide by zero. */
return 1;
}
tempsrc = (int16_t) AX;
tempdst = (int8_t) dst;
tempws = tempsrc / tempdst;
if ((tempws > 127) || (tempws < -128)) {
x86_int(0);
return 1;
}
tempws = (int8_t) tempws;
tempws2 = (int8_t) (tempsrc % tempdst);
AH = (uint8_t) tempws2;
AL = (uint8_t) tempws;
if (!cpu_iscyrix) {
flags_rebuild();
flags|=0x8D5; /*Not a Cyrix*/
}
tempws = (int)(int16_t)AX;
if (dst != 0) tempws2 = tempws / (int)((int8_t)dst);
temps = tempws2 & 0xff;
if (dst && ((int)temps == tempws2))
{
AH = (tempws % (int)((int8_t)dst)) & 0xff;
AL = tempws2 & 0xff;
if (!cpu_iscyrix)
{
flags_rebuild();
flags|=0x8D5; /*Not a Cyrix*/
}
}
else
{
x86_int(0);
return 1;
}
CLOCK_CYCLES(19);
PREFETCH_RUN(19, 2, rmdat, (cpu_mod == 3) ? 0:1,0,0,0, 1);
break;
@@ -276,7 +262,8 @@ static int opF6_a32(uint32_t fetchdat)
static int opF7_w_a16(uint32_t fetchdat)
{
uint32_t templ, templ2;
int32_t tempsrc, tempdst, tempws, tempws2 = 0;
int tempws, tempws2 = 0;
int16_t temps16;
uint16_t src, dst;
fetch_ea_16(fetchdat);
@@ -339,32 +326,21 @@ static int opF7_w_a16(uint32_t fetchdat)
CLOCK_CYCLES(is486 ? 24 : 22);
PREFETCH_RUN(is486 ? 24 : 22, 2, rmdat, (cpu_mod == 3) ? 0:1,0,0,0, 0);
break;
case 0x38: /*IDIV DX:AX,w*/
if (dst == 0) {
x86_int(0); /* Divide by zero. */
return 1;
}
templ = (uint32_t) DX;
templ = (templ << 16) | AX;
tempsrc = (int32_t) templ;
tempdst = (int16_t) dst;
tempws = tempsrc / tempdst;
if ((tempws > 32767) || (tempws < -32768)) {
x86_int(0);
return 1;
}
tempws = (int16_t) tempws;
tempws2 = (int16_t) (tempsrc % tempdst);
DX = (uint16_t) tempws2;
AX = (uint16_t) tempws;
if (!cpu_iscyrix) setznp16(AX); /*Not a Cyrix*/
case 0x38: /*IDIV AX,w*/
tempws = (int)((DX << 16)|AX);
if (dst) tempws2 = tempws / (int)((int16_t)dst);
temps16 = tempws2 & 0xffff;
if ((dst != 0) && ((int)temps16 == tempws2))
{
DX = tempws % (int)((int16_t)dst);
AX = tempws2 & 0xffff;
if (!cpu_iscyrix) setznp16(AX); /*Not a Cyrix*/
}
else
{
x86_int(0);
return 1;
}
CLOCK_CYCLES(27);
PREFETCH_RUN(27, 2, rmdat, (cpu_mod == 3) ? 0:1,0,0,0, 0);
break;
@@ -378,7 +354,8 @@ static int opF7_w_a16(uint32_t fetchdat)
static int opF7_w_a32(uint32_t fetchdat)
{
uint32_t templ, templ2;
int tempsrc, tempdst, tempws, tempws2 = 0;
int tempws, tempws2 = 0;
int16_t temps16;
uint16_t src, dst;
fetch_ea_32(fetchdat);
@@ -441,32 +418,21 @@ static int opF7_w_a32(uint32_t fetchdat)
CLOCK_CYCLES(is486 ? 24 : 22);
PREFETCH_RUN(is486 ? 24 : 22, 2, rmdat, (cpu_mod == 3) ? 0:1,0,0,0, 1);
break;
case 0x38: /*IDIV DX:AX,w*/
if (dst == 0) {
x86_int(0); /* Divide by zero. */
return 1;
}
templ = (uint32_t) DX;
templ = (templ << 16) | AX;
tempsrc = (int32_t) templ;
tempdst = (int16_t) dst;
tempws = tempsrc / tempdst;
if ((tempws > 32767) || (tempws < -32768)) {
x86_int(0);
return 1;
}
tempws = (int16_t) tempws;
tempws2 = (int16_t) (tempsrc % tempdst);
DX = (uint16_t) tempws2;
AX = (uint16_t) tempws;
if (!cpu_iscyrix) setznp16(AX); /*Not a Cyrix*/
case 0x38: /*IDIV AX,w*/
tempws = (int)((DX << 16)|AX);
if (dst) tempws2 = tempws / (int)((int16_t)dst);
temps16 = tempws2 & 0xffff;
if ((dst != 0) && ((int)temps16 == tempws2))
{
DX = tempws % (int)((int16_t)dst);
AX = tempws2 & 0xffff;
if (!cpu_iscyrix) setznp16(AX); /*Not a Cyrix*/
}
else
{
x86_int(0);
return 1;
}
CLOCK_CYCLES(27);
PREFETCH_RUN(27, 2, rmdat, (cpu_mod == 3) ? 0:1,0,0,0, 1);
break;