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Honore the fixed bits of flags when pushing them to the stack, fixes #5093.

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This commit is contained in:
OBattler
2025-05-17 21:02:06 +02:00
parent dc9101c00c
commit ddd271f6ee
3 changed files with 12 additions and 26 deletions
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17
src/cpu/x86_ops_flag.h
View File

@@ -121,6 +121,7 @@ opPUSHF(UNUSED(uint32_t fetchdat))
temp = (cpu_state.flags & ~I_FLAG) | 0x3000;
if (cpu_state.eflags & VIF_FLAG)
temp |= I_FLAG;
temp = (temp & 0x7fd5) | 2;
PUSH_W(temp);
} else {
x86gpf(NULL, 0);
@@ -128,6 +129,7 @@ opPUSHF(UNUSED(uint32_t fetchdat))
}
} else {
flags_rebuild();
cpu_state.flags = (cpu_state.flags & 0x7fd5) | 2;
PUSH_W(cpu_state.flags);
}
CLOCK_CYCLES(4);
@@ -149,6 +151,7 @@ opPUSHFD(UNUSED(uint32_t fetchdat))
else
tempw = cpu_state.eflags & 4;
flags_rebuild();
cpu_state.flags = (cpu_state.flags & 0x7fd5) | 2;
PUSH_L(cpu_state.flags | (tempw << 16));
CLOCK_CYCLES(4);
PREFETCH_RUN(4, 1, -1, 0, 0, 0, 1, 0);
@@ -160,23 +163,11 @@ opPOPF_186(UNUSED(uint32_t fetchdat))
{
uint16_t tempw;
if ((cpu_state.eflags & VM_FLAG) && (IOPL < 3)) {
x86gpf(NULL, 0);
return 1;
}
tempw = POP_W();
if (cpu_state.abrt)
return 1;
if (!(msw & 1))
cpu_state.flags = (cpu_state.flags & 0x7000) | (tempw & 0x0fd5) | 2;
else if (!(CPL))
cpu_state.flags = (tempw & 0x7fd5) | 2;
else if (IOPLp)
cpu_state.flags = (cpu_state.flags & 0x3000) | (tempw & 0x4fd5) | 2;
else
cpu_state.flags = (cpu_state.flags & 0x3200) | (tempw & 0x4dd5) | 2;
cpu_state.flags = (cpu_state.flags & 0x7000) | (tempw & 0x0fd5) | 2;
flags_extract();
#ifdef USE_DEBUG_REGS_486
rf_flag_no_clear = 1;

17
src/cpu/x86_ops_flag_2386.h
View File

@@ -121,6 +121,7 @@ opPUSHF(UNUSED(uint32_t fetchdat))
temp = (cpu_state.flags & ~I_FLAG) | 0x3000;
if (cpu_state.eflags & VIF_FLAG)
temp |= I_FLAG;
temp = (temp & 0x7fd5) | 2;
PUSH_W(temp);
} else {
x86gpf(NULL, 0);
@@ -128,6 +129,7 @@ opPUSHF(UNUSED(uint32_t fetchdat))
}
} else {
flags_rebuild();
cpu_state.flags = (cpu_state.flags & 0x7fd5) | 2;
PUSH_W(cpu_state.flags);
}
CLOCK_CYCLES(4);
@@ -149,6 +151,7 @@ opPUSHFD(UNUSED(uint32_t fetchdat))
else
tempw = cpu_state.eflags & 4;
flags_rebuild();
cpu_state.flags = (cpu_state.flags & 0x7fd5) | 2;
PUSH_L(cpu_state.flags | (tempw << 16));
CLOCK_CYCLES(4);
PREFETCH_RUN(4, 1, -1, 0, 0, 0, 1, 0);
@@ -160,23 +163,11 @@ opPOPF_186(UNUSED(uint32_t fetchdat))
{
uint16_t tempw;
if ((cpu_state.eflags & VM_FLAG) && (IOPL < 3)) {
x86gpf(NULL, 0);
return 1;
}
tempw = POP_W();
if (cpu_state.abrt)
return 1;
if (!(msw & 1))
cpu_state.flags = (cpu_state.flags & 0x7000) | (tempw & 0x0fd5) | 2;
else if (!(CPL))
cpu_state.flags = (tempw & 0x7fd5) | 2;
else if (IOPLp)
cpu_state.flags = (cpu_state.flags & 0x3000) | (tempw & 0x4fd5) | 2;
else
cpu_state.flags = (cpu_state.flags & 0x3200) | (tempw & 0x4dd5) | 2;
cpu_state.flags = (cpu_state.flags & 0x7000) | (tempw & 0x0fd5) | 2;
flags_extract();
rf_flag_no_clear = 1;