From 97c9163d97911dad0afcd0dae39e5c426e27e921 Mon Sep 17 00:00:00 2001 From: Holger Hans Peter Freyther Date: Fri, 14 Feb 2014 10:40:57 +0800 Subject: [PATCH] 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... $RANDOM"; done) | logger; done busybox's syslogd would from time to read a huge negative value and then exit, strace would get stuck waiting on a syscall. After this patch it appears to work better. (From OE-Core master rev: 3004eb3b7ee5fd8dfe9c4e5749b4e125d0bd4b59) (From OE-Core rev: acef5185492287b9569f7fbbc3e9570d688e9c9f) Signed-off-by: Holger Hans Peter Freyther Signed-off-by: Richard Purdie Signed-off-by: Robert Yang Signed-off-by: Richard Purdie --- meta/recipes-devtools/gcc/gcc-4.8.inc | 1 + .../0048-PR58854_fix_arm_apcs_epilogue.patch | 23 +++++++++++++++++++ 2 files changed, 24 insertions(+) create mode 100644 meta/recipes-devtools/gcc/gcc-4.8/0048-PR58854_fix_arm_apcs_epilogue.patch diff --git a/meta/recipes-devtools/gcc/gcc-4.8.inc b/meta/recipes-devtools/gcc/gcc-4.8.inc index b34c7ae3c4..f1260af3a3 100644 --- a/meta/recipes-devtools/gcc/gcc-4.8.inc +++ b/meta/recipes-devtools/gcc/gcc-4.8.inc @@ -78,6 +78,7 @@ SRC_URI = "${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 0000000000..0ef245a17f --- /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 + + Backported from mainline + 2013-10-30 Ramana Radhakrishnan + + 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,