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gcc: Include patch scheduled for GCC 4.8.3 to fix epilogue on ARM

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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>
This commit is contained in:
Holger Hans Peter Freyther
2014-01-31 10:45:17 +01:00
committed by Richard Purdie
parent 964a590539
commit 5e6db9dc4d
2 changed files with 24 additions and 0 deletions
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1
meta/recipes-devtools/gcc/gcc-4.8.inc
View File

@@ -68,6 +68,7 @@ SRC_URI = "${GNU_MIRROR}/gcc/gcc-${PV}/gcc-${PV}.tar.bz2 \
file://0045-gcc-4.8-PR57717-PowerPC-E500v2.patch \
file://0046-libatomic-deptracking.patch \
file://0047-repomembug.patch \
file://0048-PR58854_fix_arm_apcs_epilogue.patch \
"
SRC_URI[md5sum] = "a3d7d63b9cb6b6ea049469a0c4a43c9d"
SRC_URI[sha256sum] = "09dc2276c73424bbbfda1dbddc62bbbf900c9f185acf7f3e1d773ce2d7e3cdc8"

23
meta/recipes-devtools/gcc/gcc-4.8/0048-PR58854_fix_arm_apcs_epilogue.patch Normal file
View File

@@ -0,0 +1,23 @@
Backport fix for PR target/58854
2013-11-11 Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
Backported from mainline
2013-10-30 Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
PR target/58854
* config/arm/arm.c (arm_expand_epilogue_apcs_frame): Emit blockage
Upstream-Status: Backport
--- gcc-4_8-branch/gcc/config/arm/arm.c 2013/11/11 08:00:45 204664
+++ gcc-4_8-branch/gcc/config/arm/arm.c 2013/11/11 09:38:14 204665
@@ -23555,6 +23555,7 @@
num_regs = bit_count (saved_regs_mask);
if ((offsets->outgoing_args != (1 + num_regs)) || cfun->calls_alloca)
{
+ emit_insn (gen_blockage ());
/* Unwind the stack to just below the saved registers. */
emit_insn (gen_addsi3 (stack_pointer_rtx,
hard_frame_pointer_rtx,