5e6db9dc4d
GCC 4.8.0, 4.8.1 and 4.8.2 can generate broken epilogues for the ABI used by the kernel. Apply the patch that is included for GCC 4.8.3 from http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854. The issue was found on Yocto/Dora and the patch should be backported to this branch. A kernel built with Dora's GCC 4.8.1 misbehaved on: while true; do (for i in `seq 1 100`; do echo "Log message... $RANDOM"; done) | logger; done busybox's syslogd would from time to read a huge negative value and then exit, strace would get stuck waiting on a syscall. After this patch it appears to work better. (From OE-Core rev: 3004eb3b7ee5fd8dfe9c4e5749b4e125d0bd4b59) Signed-off-by: Holger Hans Peter Freyther <holger@moiji-mobile.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
24 lines
818 B
Diff
24 lines
818 B
Diff
Backport fix for PR target/58854
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2013-11-11 Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
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Backported from mainline
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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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Upstream-Status: Backport
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--- gcc-4_8-branch/gcc/config/arm/arm.c 2013/11/11 08:00:45 204664
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+++ gcc-4_8-branch/gcc/config/arm/arm.c 2013/11/11 09:38:14 204665
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@@ -23555,6 +23555,7 @@
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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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