ArmPkg/DefaultExceptionHandlerLib AARCH64: add minimal backtrace to crash dump
When dumping the CPU state after an unhandled fault, walk the stack
frames and decode the return addresses so we can show a minimal
backtrace. Unfortunately, we do not have sufficient information to
show the function names, but at least we can see the modules and the
return addresses inside the modules.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Tested-by: Leif Lindholm <leif.lindholm@linaro.org>
diff --git a/ArmPkg/Library/DefaultExceptionHandlerLib/AArch64/DefaultExceptionHandler.c b/ArmPkg/Library/DefaultExceptionHandlerLib/AArch64/DefaultExceptionHandler.c
index 31fc936..84b442f 100644
--- a/ArmPkg/Library/DefaultExceptionHandlerLib/AArch64/DefaultExceptionHandler.c
+++ b/ArmPkg/Library/DefaultExceptionHandlerLib/AArch64/DefaultExceptionHandler.c
@@ -152,9 +152,30 @@
CHAR8 *Pdb;
UINTN ImageBase;
UINTN PeCoffSizeOfHeader;
+ UINT64 *Fp;
+
Pdb = GetImageName (SystemContext.SystemContextAArch64->ELR, &ImageBase, &PeCoffSizeOfHeader);
if (Pdb != NULL) {
DEBUG ((EFI_D_ERROR, "%a loaded at 0x%016lx \n", Pdb, ImageBase));
+
+ Pdb = GetImageName (SystemContext.SystemContextAArch64->LR, &ImageBase,
+ &PeCoffSizeOfHeader);
+ if (Pdb != NULL) {
+ DEBUG ((EFI_D_ERROR, "called from %a (0x%016lx) loaded at 0x%016lx \n",
+ Pdb, SystemContext.SystemContextAArch64->LR, ImageBase));
+ }
+ for (Fp = (UINT64 *)SystemContext.SystemContextAArch64->FP;
+ *Fp != 0;
+ Fp = (UINT64 *)Fp[0]) {
+ if (Fp[1] == SystemContext.SystemContextAArch64->LR) {
+ continue;
+ }
+ Pdb = GetImageName (Fp[1], &ImageBase, &PeCoffSizeOfHeader);
+ if (Pdb != NULL) {
+ DEBUG ((EFI_D_ERROR, "called from %a (0x%016lx) loaded at 0x%016lx \n",
+ Pdb, Fp[1], ImageBase));
+ }
+ }
}
DEBUG_CODE_END ();
