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i386: handle double and triple faults

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This commit is contained in:
cracyc 2024-03-23 10:00:50 -05:00
parent f2f62c0d66
commit d252b1f474
1 changed files with 36 additions and 28 deletions
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64
src/devices/cpu/i386/i386segs.hxx
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@ -436,18 +436,6 @@ void i386_device::i386_trap(int irq, int irq_gate, int trap_level)
type = (v2>>8) & 0x1F;
flags = (v2>>8) & 0xf0ff;
if(trap_level == 2)
{
LOGMASKED(LOG_PM_FAULT_DF, "IRQ: Double fault.\n");
FAULT_EXP(FAULT_DF,0);
}
if(trap_level >= 3)
{
LOGMASKED(LOG_PM_EVENTS, "IRQ: Triple fault. CPU reset.\n");
pulse_input_line(INPUT_LINE_RESET, attotime::zero);
return;
}
/* segment privilege checks */
if(entry >= m_idtr.limit)
{
@ -778,30 +766,50 @@ void i386_device::i386_trap(int irq, int irq_gate, int trap_level)
void i386_device::i386_trap_with_error(int irq, int irq_gate, int trap_level, uint32_t error)
{
i386_trap(irq,irq_gate,trap_level);
if(irq == 8 || irq == 10 || irq == 11 || irq == 12 || irq == 13 || irq == 14)
try
{
// for these exceptions, an error code is pushed onto the stack by the processor.
// no error code is pushed for software interrupts, either.
if(PROTECTED_MODE)
i386_trap(irq,irq_gate,trap_level);
if(irq == 8 || irq == 10 || irq == 11 || irq == 12 || irq == 13 || irq == 14)
{
uint32_t entry = irq * 8;
uint32_t v2,type;
v2 = READ32PL(m_idtr.base + entry + 4, 0);
type = (v2>>8) & 0x1F;
if(type == 5)
// for these exceptions, an error code is pushed onto the stack by the processor.
// no error code is pushed for software interrupts, either.
if(PROTECTED_MODE)
{
v2 = READ32PL(m_idtr.base + entry, 0);
v2 = READ32PL(m_gdtr.base + ((v2 >> 16) & 0xfff8) + 4, 0);
uint32_t entry = irq * 8;
uint32_t v2,type;
v2 = READ32PL(m_idtr.base + entry + 4, 0);
type = (v2>>8) & 0x1F;
if(type == 5)
{
v2 = READ32PL(m_idtr.base + entry, 0);
v2 = READ32PL(m_gdtr.base + ((v2 >> 16) & 0xfff8) + 4, 0);
type = (v2>>8) & 0x1F;
}
if(type >= 9)
PUSH32(error);
else
PUSH16(error);
}
if(type >= 9)
PUSH32(error);
else
PUSH16(error);
}
else
PUSH16(error);
}
catch(uint64_t e)
{
trap_level++;
if(trap_level == 1)
{
m_ext = 1;
LOGMASKED(LOG_PM_FAULT_DF, "IRQ: Double fault.\n");
i386_trap_with_error(FAULT_DF,0,trap_level,0);
return;
}
if(trap_level >= 2)
{
LOGMASKED(LOG_PM_EVENTS, "IRQ: Triple fault. CPU reset.\n");
pulse_input_line(INPUT_LINE_RESET, attotime::zero);
return;
}
}
}