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ArmPkg/DefaultExceptionHandlerLib: add stack dump to exception handling code 

This adds a partial stack dump (256 bytes at either side of the stack
pointer) to the CPU state dumping routine that is invoked when taking an
unexpected exception. Since dereferencing the stack pointer may itself
fault, ensure that we don't enter the dumping routine recursively.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Ard Biesheuvel 2016-05-09 16:24:18 +02:00
parent 1549fb607b
commit cd82e330bb
1 changed files with 21 additions and 0 deletions
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21
ArmPkg/Library/DefaultExceptionHandlerLib/AArch64/DefaultExceptionHandler.c
View File

@ -34,6 +34,8 @@ STATIC CHAR8 *gExceptionTypeString[] = {
"SError"
};
STATIC BOOLEAN mRecursiveException;
CHAR8 *
GetImageName (
IN UINTN FaultAddress,
@ -134,6 +136,14 @@ DefaultExceptionHandler (
{
CHAR8 Buffer[100];
UINTN CharCount;
INT32 Offset;
if (mRecursiveException) {
CharCount = AsciiSPrint (Buffer, sizeof (Buffer),"\nRecursive exception occurred while dumping the CPU state\n");
SerialPortWrite ((UINT8 *) Buffer, CharCount);
CpuDeadLoop ();
}
mRecursiveException = TRUE;
CharCount = AsciiSPrint (Buffer,sizeof (Buffer),"\n\n%a Exception at 0x%016lx\n", gExceptionTypeString[ExceptionType], SystemContext.SystemContextAArch64->ELR);
SerialPortWrite ((UINT8 *) Buffer, CharCount);
@ -183,5 +193,16 @@ DefaultExceptionHandler (
DescribeExceptionSyndrome (SystemContext.SystemContextAArch64->ESR);
ASSERT (FALSE):
DEBUG ((EFI_D_ERROR, "\nStack dump:\n"));
for (Offset = -256; Offset < 256; Offset += 32) {
DEBUG ((EFI_D_ERROR, "%c %013lx: %016lx %016lx %016lx %016lx\n",
Offset == 0 ? '>' : ' ',
SystemContext.SystemContextAArch64->SP + Offset,
*(UINT64 *)(SystemContext.SystemContextAArch64->SP + Offset),
*(UINT64 *)(SystemContext.SystemContextAArch64->SP + Offset + 8),
*(UINT64 *)(SystemContext.SystemContextAArch64->SP + Offset + 16),
*(UINT64 *)(SystemContext.SystemContextAArch64->SP + Offset + 24)));
}
CpuDeadLoop ();
}