From: Holger Hans Peter Freyther Date: Fri, 31 Jan 2014 09:45:17 +0000 (+0100) Subject: gcc: Include patch scheduled for GCC 4.8.3 to fix epilogue on ARM X-Git-Tag: lucaceresoli/bug-15201-perf-libtraceevent-missing~34705 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3004eb3b7ee5fd8dfe9c4e5749b4e125d0bd4b59;p=thirdparty%2Fopenembedded%2Fopenembedded-core-contrib.git 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... $RANDOM"; done) | logger; done busybox's syslogd would from time to read a huge negative value and then exit, strace would get stuck waiting on a syscall. After this patch it appears to work better. Signed-off-by: Holger Hans Peter Freyther Signed-off-by: Richard Purdie --- diff --git a/meta/recipes-devtools/gcc/gcc-4.8.inc b/meta/recipes-devtools/gcc/gcc-4.8.inc index a140573d713..fdd0c12ae08 100644 --- a/meta/recipes-devtools/gcc/gcc-4.8.inc +++ b/meta/recipes-devtools/gcc/gcc-4.8.inc @@ -68,6 +68,7 @@ SRC_URI = "${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 00000000000..0ef245a17fd --- /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,