c443c2be17
This seems to especially affect the kernel, but in an interrupt-heavy system, this fixes a bug that can cause frequent NULL pointer dereference crashes on ARM systems. Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
33 lines
1.1 KiB
Diff
33 lines
1.1 KiB
Diff
From 9a228f68817f79bbd1d295b8e6fcaed25c47ee8f Mon Sep 17 00:00:00 2001
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From: ramana <ramana@138bc75d-0d04-0410-961f-82ee72b054a4>
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Date: Wed, 30 Oct 2013 10:54:04 +0000
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Subject: [PATCH] Fix PR target/58854
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2013-10-30 Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
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PR target/58854
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* config/arm/arm.c (arm_expand_epilogue_apcs_frame): Emit blockage.
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git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@204203 138bc75d-0d04-0410-961f-82ee72b054a4
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---
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(omitted from this patch) gcc/ChangeLog | 5 +++++
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gcc/config/arm/arm.c | 1 +
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2 files changed, 6 insertions(+), 0 deletions(-)
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diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
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index 212a4bc..23dfc0e 100644
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--- a/gcc/config/arm/arm.c
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+++ b/gcc/config/arm/arm.c
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@@ -26547,6 +26547,7 @@ arm_expand_epilogue_apcs_frame (bool really_return)
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num_regs = bit_count (saved_regs_mask);
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if ((offsets->outgoing_args != (1 + num_regs)) || cfun->calls_alloca)
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{
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+ emit_insn (gen_blockage ());
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/* Unwind the stack to just below the saved registers. */
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emit_insn (gen_addsi3 (stack_pointer_rtx,
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hard_frame_pointer_rtx,
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--
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1.7.1
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