On Fri, Jan 31, 2014 at 10:45:17AM +0100, Holger Hans Peter Freyther wrote: > 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 \
You're not the first in this file, but please don't mix tabs and spaces
for indentation.
> "
> 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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--
Martin 'JaMa' Jansa jabber: martin.ja...@gmail.com
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