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kernel/x86: Determine math/SIMD exception cause in exception handler.

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Fixes a TODO.

Change-Id: I75e7f05bd72f1500234a7b43ed9da01d3a61ecf2
Reviewed-on: https://review.haiku-os.org/c/haiku/+/9082
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: Jérôme Duval <[email protected]>
Reviewed-by: waddlesplash <[email protected]>
This commit is contained in:
Augustin Cavalier
2025-03-11 02:13:26 +00:00
committed by waddlesplash
parent 4c76039f6f
commit bdb6d7db1a
1 changed files with 30 additions and 11 deletions
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src/system/kernel/arch/x86/arch_int.cpp
+30 -11
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@@ -28,6 +28,7 @@
#include <arch/x86/msi.h>
#include <arch/x86/msi_priv.h>
#include <fenv.h>
#include <stdio.h>
// interrupt controllers
@@ -157,13 +158,39 @@ x86_unexpected_exception(iframe* frame)
break;
case 16: // x87 FPU Floating-Point Error (#MF)
case 19: // SIMD Floating-Point Exception (#XF)
{
type = B_FLOATING_POINT_EXCEPTION;
signalNumber = SIGFPE;
signalCode = FPE_FLTDIV;
// TODO: Determine the correct cause via the FPU status
// register!
signalCode = FPE_FLTINV;
signalAddress = frame->ip;
uint32 status = 0;
if (frame->vector == 19) {
// MXCSR is only available on SSE, however exception 19 should only
// ever occur if the processor has SSE anyway and OSXMMEXCPT is set.
__stmxcsr(&status);
} else {
uint16 fsw = 0;
__fnstsw(&fsw);
status = fsw;
}
// Determine the real cause of the exception, if possible.
if ((status & FE_INVALID) != 0)
signalCode = FPE_FLTINV;
else if ((status & FE_DENORMAL) != 0)
signalCode = FPE_FLTUND;
else if ((status & FE_DIVBYZERO) != 0)
signalCode = FPE_FLTDIV;
else if ((status & FE_OVERFLOW) != 0)
signalCode = FPE_FLTOVF;
else if ((status & FE_UNDERFLOW) != 0)
signalCode = FPE_FLTUND;
else if ((status & FE_INEXACT) != 0)
signalCode = FPE_FLTRES;
break;
}
case 17: // Alignment Check Exception (#AC)
type = B_ALIGNMENT_EXCEPTION;
@@ -174,14 +201,6 @@ x86_unexpected_exception(iframe* frame)
signalError = EFAULT;
break;
case 19: // SIMD Floating-Point Exception (#XF)
type = B_FLOATING_POINT_EXCEPTION;
signalNumber = SIGFPE;
signalCode = FPE_FLTDIV;
// TODO: Determine the correct cause via the MXCSR register!
signalAddress = frame->ip;
break;
default:
x86_invalid_exception(frame);
return;