ArmPkg/ArmExceptionLib: use EL0 stack for synchronous exceptions
In order to be able to produce meaningful diagnostic output when taking synchronous exceptions that have been caused by corruption of the stack pointer, prepare the EL0 stack pointer and switch to it when handling the 'Sync exception using SPx' exception class. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
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@@ -16,7 +16,7 @@
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#include <Uefi.h>
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#include <Chipset/AArch64.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Protocol/DebugSupport.h> // for MAX_AARCH64_EXCEPTION
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UINTN gMaxExceptionNumber = MAX_AARCH64_EXCEPTION;
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@@ -25,11 +25,26 @@ EFI_EXCEPTION_CALLBACK gDebuggerExceptionHandlers[MAX_AARCH64_EXCEPTION + 1] =
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PHYSICAL_ADDRESS gExceptionVectorAlignmentMask = ARM_VECTOR_TABLE_ALIGNMENT;
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UINTN gDebuggerNoHandlerValue = 0; // todo: define for AArch64
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#define EL0_STACK_PAGES 2
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VOID
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RegisterEl0Stack (
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IN VOID *Stack
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);
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RETURN_STATUS ArchVectorConfig(
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IN UINTN VectorBaseAddress
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)
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{
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UINTN HcrReg;
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UINT8 *Stack;
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Stack = AllocatePages (EL0_STACK_PAGES);
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if (Stack == NULL) {
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return RETURN_OUT_OF_RESOURCES;
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}
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RegisterEl0Stack ((UINT8 *)Stack + EFI_PAGES_TO_SIZE (EL0_STACK_PAGES));
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if (ArmReadCurrentEL() == AARCH64_EL2) {
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HcrReg = ArmReadHcr();
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