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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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2
src/386_dynarec.c
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@ -663,7 +663,7 @@ void exec386_dynarec(int cycs)
valid_block = 0;
}
}
if (valid_block && block->was_recompiled && (block->flags & CODEBLOCK_STATIC_TOP) && block->TOP != cpu_state.TOP)
if (valid_block && block->was_recompiled && (block->flags & CODEBLOCK_STATIC_TOP) && block->TOP != (cpu_state.TOP & 7))
{
/*FPU top-of-stack does not match the value this block was compiled
with, re-compile using dynamic top-of-stack*/

2
src/codegen_backend.c
View file

@ -303,7 +303,7 @@ void codegen_block_start_recompile(codeblock_t *block)
cpu_state.seg_ds.checked = cpu_state.seg_es.checked = cpu_state.seg_fs.checked = cpu_state.seg_gs.checked = (cr0 & 1) ? 0 : 1;
block->TOP = cpu_state.TOP;
block->TOP = cpu_state.TOP & 7;
block->was_recompiled = 1;
codegen_flat_ds = !(cpu_cur_status & CPU_STATUS_NOTFLATDS);

6
src/x87_ops_misc.h
View file

@ -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;
}