From: "Leif Lindholm" <quic_llindhol@quicinc.com>
To: <devel@edk2.groups.io>
Cc: "Philippe Mathieu-Daudé" <philmd@linaro.org>,
"Ard Biesheuvel" <ardb+tianocore@kernel.org>,
"Sami Mujawar" <sami.mujawar@arm.com>
Subject: [edk2-devel] [PATCH v2 5/5] MdePkg/BaseLib: ensure ARM LongJump never returns 0
Date: Tue, 26 Sep 2023 18:15:23 +0100 [thread overview]
Message-ID: <20230926171523.368706-6-quic_llindhol@quicinc.com> (raw)
In-Reply-To: <20230926171523.368706-1-quic_llindhol@quicinc.com>
The ARM implementation of of InternalLongJump always returned the value
Value - but it is not supposed to ever return 0. Add the test to prevent
that, and return 1 if Value is 0 - as is already present in AArch64.
Signed-off-by: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Sami Mujawar <sami.mujawar@arm.com>
---
MdePkg/Library/BaseLib/Arm/SetJumpLongJump.S | 2 ++
MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm | 2 ++
2 files changed, 4 insertions(+)
diff --git a/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.S b/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.S
index e91320252255..14006c6123e3 100644
--- a/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.S
+++ b/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.S
@@ -57,6 +57,8 @@ ASM_PFX(SetJump):
ASM_PFX(InternalLongJump):
ldmia r0, {r3-r12,r14}
mov r13, r3
+ cmp r1, #0
+ moveq r1, #1
mov r0, r1
bx lr
diff --git a/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm b/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm
index ef02d85e0e66..15eb3dc28fb7 100644
--- a/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm
+++ b/MdePkg/Library/BaseLib/Arm/SetJumpLongJump.asm
@@ -57,6 +57,8 @@ SetJump
InternalLongJump
LDM R0, {R3-R12,R14}
MOV R13, R3
+ CMP R1, #0
+ MOVEQ R1, #1
MOV R0, R1
BX LR
--
2.30.2
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next prev parent reply other threads:[~2023-09-26 17:15 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-26 17:15 [edk2-devel] [PATCH v2 0/5] MdePkg: various fixes to ARM/AArch64 SetJump/LongJump Leif Lindholm
2023-09-26 17:15 ` [edk2-devel] [PATCH v2 1/5] MdePkg/BaseLib: fix comments in ARM* SetJump/LongJump implementations Leif Lindholm
2023-09-29 15:06 ` Sami Mujawar
2023-09-26 17:15 ` [edk2-devel] [PATCH v2 2/5] MdePkg/BaseLib: add ASSERT in ARM* SetJump implementations Leif Lindholm
2023-09-29 15:06 ` Sami Mujawar
2023-10-02 15:52 ` Leif Lindholm
2023-09-26 17:15 ` [edk2-devel] [PATCH v2 3/5] MdePkg/BaseLib: use normal register init in ARM " Leif Lindholm
2023-09-29 15:07 ` Sami Mujawar
2023-10-02 18:00 ` Philippe Mathieu-Daudé
2023-10-03 10:43 ` Leif Lindholm
2023-09-26 17:15 ` [edk2-devel] [PATCH v2 4/5] MdePkg/BaseLib: correct register sizes in AArch64 SetJump/LongJump Leif Lindholm
2023-09-29 15:07 ` Sami Mujawar
2023-09-29 22:00 ` Andrei Warkentin
2023-10-02 17:56 ` Philippe Mathieu-Daudé
2023-09-26 17:15 ` Leif Lindholm [this message]
2023-09-29 15:07 ` [edk2-devel] [PATCH v2 5/5] MdePkg/BaseLib: ensure ARM LongJump never returns 0 Sami Mujawar
2023-10-02 17:58 ` Philippe Mathieu-Daudé
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