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From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: edk2-devel@lists.01.org, liming.gao@intel.com
Cc: leif.lindholm@linaro.org, Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: [PATCH] MdePkg/BaseLib AARCH64: terminate stack frame list on stack switch
Date: Fri,  9 Sep 2016 08:21:26 +0100	[thread overview]
Message-ID: <1473405686-5465-1-git-send-email-ard.biesheuvel@linaro.org> (raw)

When switching to the DXE phase stack, set the frame pointer to zero so
that code walking the stack frame will not try to access stack frames\
belonging to the old stack.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 MdePkg/Library/BaseLib/AArch64/SwitchStack.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/MdePkg/Library/BaseLib/AArch64/SwitchStack.S b/MdePkg/Library/BaseLib/AArch64/SwitchStack.S
index 2bce9c998f4f..c3ac8d7e4dfe 100644
--- a/MdePkg/Library/BaseLib/AArch64/SwitchStack.S
+++ b/MdePkg/Library/BaseLib/AArch64/SwitchStack.S
@@ -40,6 +40,7 @@ InternalSwitchStackAsm (
   );
 **/
 ASM_PFX(InternalSwitchStackAsm):
+    mov   x29, #0
     mov   x30, x0
     mov   sp, x3
     mov   x0, x1
-- 
2.7.4



             reply	other threads:[~2016-09-09  7:21 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-09  7:21 Ard Biesheuvel [this message]
2016-09-09 11:18 ` [PATCH] MdePkg/BaseLib AARCH64: terminate stack frame list on stack switch Leif Lindholm
2016-09-09 12:03   ` Ard Biesheuvel
2016-09-09 12:10     ` Leif Lindholm

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