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Non-808x interpreters: fetch the next instruction after a CR0 paging bit toggle with the old CR0 paging bit value, fixes SCO Unix.

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OBattler
2024-08-27 02:34:59 +02:00
parent f9b80f1a10
commit 7c7cc921ee
8 changed files with 79 additions and 15 deletions
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21
src/cpu/x86_ops_pmode.h
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@@ -431,12 +431,21 @@ op0F01_common(uint32_t fetchdat, int is32, int is286, int ea32)
if (cpu_mod != 3)
SEG_CHECK_WRITE(cpu_state.ea_seg);
if (is386 && is32 && (cpu_mod == 3)) {
if (is486 || isibm486)
seteaw(cr0);
else if (is386 && !cpu_16bitbus)
seteaw(cr0 | /* 0x7FFFFF00 */ 0x7FFFFFE0);
else
seteaw(cr0 | 0x7FFFFFF0);
if (cpu_flush_pending) {
if (is486 || isibm486)
seteaw(cr0 ^ 0x80000000);
else if (is386 && !cpu_16bitbus)
seteaw((cr0 ^ 0x80000000) | /* 0x7FFFFF00 */ 0x7FFFFFE0);
else
seteaw((cr0 ^ 0x80000000) | 0x7FFFFFF0);
} else {
if (is486 || isibm486)
seteaw(cr0);
else if (is386 && !cpu_16bitbus)
seteaw(cr0 | /* 0x7FFFFF00 */ 0x7FFFFFE0);
else
seteaw(cr0 | 0x7FFFFFF0);
}
} else {
if (is486 || isibm486)
seteaw(msw);