[OE-core] [PATCH 1/2] gcc: Include patch scheduled for GCC 4.8.3 to fix epilogue on ARM

[Robert Yang]

From: Holger Hans Peter Freyther <holger at moiji-mobile.com>

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 master rev: 3004eb3b7ee5fd8dfe9c4e5749b4e125d0bd4b59)

Signed-off-by: Holger Hans Peter Freyther <holger at moiji-mobile.com>
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
Signed-off-by: Robert Yang <liezhi.yang at windriver.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 b34c7ae..f1260af 100644
--- a/meta/recipes-devtools/gcc/gcc-4.8.inc
+++ b/meta/recipes-devtools/gcc/gcc-4.8.inc
@@ -78,6 +78,7 @@ SRC_URI = "${GNU_MIRROR}/gcc/gcc-${PV}/gcc-${PV}.tar.bz2 \
 	   file://0046-libatomic-deptracking.patch \
 	   file://0047-repomembug.patch \
 	   file://0048-PR57532.patch \
+	   file://0048-PR58854_fix_arm_apcs_epilogue.patch \
 	  "
 SRC_URI[md5sum] = "3b2386c114cd74185aa3754b58a79304"
 SRC_URI[sha256sum] = "545b44be3ad9f2c4e90e6880f5c9d4f0a8f0e5f67e1ffb0d45da9fa01bb05813"
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,
-- 
1.8.3.1