[Bug target/77933] Stack corruption on ARM when using high registers and __builtin_return_address

[thopre01 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77933

--- Comment #6 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
Author: thopre01
Date: Thu Nov 17 20:30:41 2016
New Revision: 242560

URL: https://gcc.gnu.org/viewcvs?rev=242560&root=gcc&view=rev
Log:
Fix PR77933: stack corruption on ARM when using high registers and LR

2016-11-08  Thomas Preud'homme  <thomas.preudhomme@arm.com>

        Backport from mainline
        2016-11-08  Thomas Preud'homme  <thomas.preudhomme@arm.com>

        gcc/
        PR target/77933
        * config/arm/arm.c (thumb1_expand_prologue): Distinguish between lr
        being live in the function and lr needing to be saved.  Distinguish
        between already saved pushable registers and registers to push.
        Check for LR being an available pushable register.

        gcc/testsuite/
        PR target/77933
        * gcc.target/arm/pr77933-1.c: New test.
        * gcc.target/arm/pr77933-2.c: Likewise.


Added:
    branches/ARM/embedded-6-branch/gcc/testsuite/gcc.target/arm/pr77933-1.c
    branches/ARM/embedded-6-branch/gcc/testsuite/gcc.target/arm/pr77933-2.c
Modified:
    branches/ARM/embedded-6-branch/gcc/ChangeLog.arm
    branches/ARM/embedded-6-branch/gcc/config/arm/arm.c
    branches/ARM/embedded-6-branch/gcc/testsuite/ChangeLog.arm