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Fix masking of FPU top-of-stack in several places. Fixes DOS Quake.

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This commit is contained in:
SarahW 2018-10-09 13:51:05 +01:00
commit d9e38fe37c
3 changed files with 5 additions and 5 deletions
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6
src/x87_ops_misc.h
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@ -144,7 +144,7 @@ static int FSAVE()
{
FP_ENTER();
if (fplog) pclog("FSAVE %08X:%08X %i\n", easeg, cpu_state.eaaddr, cpu_state.ismmx);
cpu_state.npxs = (cpu_state.npxs & ~(7 << 11)) | (cpu_state.TOP << 11);
cpu_state.npxs = (cpu_state.npxs & ~(7 << 11)) | ((cpu_state.TOP & 7) << 11);
switch ((cr0 & 1) | (cpu_state.op32 & 0x100))
{
@ -308,7 +308,7 @@ static int opFSTSW_a16(uint32_t fetchdat)
fetch_ea_16(fetchdat);
SEG_CHECK_WRITE(cpu_state.ea_seg);
if (fplog) pclog("FSTSW %08X:%08X\n", easeg, cpu_state.eaaddr);
seteaw((cpu_state.npxs & 0xC7FF) | (cpu_state.TOP << 11));
seteaw((cpu_state.npxs & 0xC7FF) | ((cpu_state.TOP & 7) << 11));
CLOCK_CYCLES(3);
return cpu_state.abrt;
}
@ -318,7 +318,7 @@ static int opFSTSW_a32(uint32_t fetchdat)
fetch_ea_32(fetchdat);
SEG_CHECK_WRITE(cpu_state.ea_seg);
if (fplog) pclog("FSTSW %08X:%08X\n", easeg, cpu_state.eaaddr);
seteaw((cpu_state.npxs & 0xC7FF) | (cpu_state.TOP << 11));
seteaw((cpu_state.npxs & 0xC7FF) | ((cpu_state.TOP & 7) << 11));
CLOCK_CYCLES(3);
return cpu_state.abrt;
}