[oe-commits] Holger Hans Peter Freyther : gcc: Include patch scheduled for GCC 4.8.3 to fix epilogue on ARM

[git at git.openembedded.org]

Module: openembedded-core.git
Branch: master-next
Commit: 3004eb3b7ee5fd8dfe9c4e5749b4e125d0bd4b59
URL:    http://git.openembedded.org/?p=openembedded-core.git&a=commit;h=3004eb3b7ee5fd8dfe9c4e5749b4e125d0bd4b59

Author: Holger Hans Peter Freyther <holger at moiji-mobile.com>
Date:   Fri Jan 31 10:45:17 2014 +0100

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

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 <holger at moiji-mobile.com>
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>

---

 meta/recipes-devtools/gcc/gcc-4.8.inc              |  1 +
 .../0048-PR58854_fix_arm_apcs_epilogue.patch       | 23 ++++++++++++++++++++++
 2 files changed, 24 insertions(+)

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.radhakrishnan at arm.com>
+
+       Backported from mainline
+        2013-10-30  Ramana Radhakrishnan  <ramana.radhakrishnan at 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,