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... $RANDOM";
done) | logger;
done
busybox's syslogd would from time to read a huge negative value and
then exit, strace would get stuck waiting on a syscall. After this
patch it appears to work better.
Signed-off-by: Holger Hans Peter Freyther <hol...@moiji-mobile.com>
---
meta/recipes-devtools/gcc/gcc-4.8.inc | 1 +
.../0048-PR58854_fix_arm_apcs_epilogue.patch | 23 ++++++++++++++++++++++
2 files changed, 24 insertions(+)
create mode 100644
meta/recipes-devtools/gcc/gcc-4.8/0048-PR58854_fix_arm_apcs_epilogue.patch
diff --git a/meta/recipes-devtools/gcc/gcc-4.8.inc
b/meta/recipes-devtools/gcc/gcc-4.8.inc
index a140573..fdd0c12 100644
--- a/meta/recipes-devtools/gcc/gcc-4.8.inc
+++ b/meta/recipes-devtools/gcc/gcc-4.8.inc
@@ -68,6 +68,7 @@ SRC_URI = "${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"
diff --git
a/meta/recipes-devtools/gcc/gcc-4.8/0048-PR58854_fix_arm_apcs_epilogue.patch
b/meta/recipes-devtools/gcc/gcc-4.8/0048-PR58854_fix_arm_apcs_epilogue.patch
new file mode 100644
index 0000000..0ef245a
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc-4.8/0048-PR58854_fix_arm_apcs_epilogue.patch
@@ -0,0 +1,23 @@
+Backport fix for PR target/58854
+
+2013-11-11 Ramana Radhakrishnan <ramana.radhakrish...@arm.com>
+
+ Backported from mainline
+ 2013-10-30 Ramana Radhakrishnan <ramana.radhakrish...@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,
--
1.8.5.2
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