[v2] Armada 7k/8k - misc improvements

[edk2] [platforms: PATCH v2 03/12] Marvell/Armada: Armada70x0Lib: Terminate call stack list at entry

Posted by Marcin Wojtas 7 years, 2 months ago

From: Ard Biesheuvel <ard.biesheuvel@linaro.org>

To avoid dereferencing junk when walking the call stack in exception
handlers (which may prevent us from getting a full backtrace), set
the frame pointer to 0x0 when first entering UEFI.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
---
 Platform/Marvell/Armada/Library/Armada70x0Lib/AArch64/ArmPlatformHelper.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Platform/Marvell/Armada/Library/Armada70x0Lib/AArch64/ArmPlatformHelper.S b/Platform/Marvell/Armada/Library/Armada70x0Lib/AArch64/ArmPlatformHelper.S
index 9265636..72f8cfc 100644
--- a/Platform/Marvell/Armada/Library/Armada70x0Lib/AArch64/ArmPlatformHelper.S
+++ b/Platform/Marvell/Armada/Library/Armada70x0Lib/AArch64/ArmPlatformHelper.S
@@ -16,6 +16,7 @@
 #include <Library/ArmLib.h>
 
 ASM_FUNC(ArmPlatformPeiBootAction)
+  mov   x29, xzr
   ret
 
 //UINTN
-- 
2.7.4

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