[Bug target/99725] arm: ICE in dwarf2out_frame_debug_adjust_cfa with -mcmse

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99725

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Alex Coplan
<acoplan@gcc.gnu.org>:

https://gcc.gnu.org/g:1cbde1725cac9ae53b892449c847f28f977f3a9b

commit r10-9877-g1cbde1725cac9ae53b892449c847f28f977f3a9b
Author: Alex Coplan <alex.coplan@arm.com>
Date:   Tue May 11 13:11:09 2021 +0100

    arm: Avoid emitting bogus CFA adjusts for CMSE nonsecure calls [PR99725]

    The PR shows us attaching REG_CFA_ADJUST_CFA notes to stack pointer
    adjustments emitted in cmse_nonsecure_call_inline_register_clear (when
    -march=armv8.1-m.main). However, the stack pointer is not guaranteed to
    be the CFA reg. If we're at -O0 or we have -fno-omit-frame-pointer, then
    the frame pointer will be used as the CFA reg, and these notes on the sp
    adjustments will lead to ICEs in dwarf2out_frame_debug_adjust_cfa.

    This patch avoids emitting these notes if the current function has a
    frame pointer.

    gcc/ChangeLog:

            PR target/99725
            * config/arm/arm.c (cmse_nonsecure_call_inline_register_clear):
            Avoid emitting CFA adjusts on the sp if we have the fp.

    gcc/testsuite/ChangeLog:

            PR target/99725
            * gcc.target/arm/cmse/pr99725.c: New test.

    (cherry picked from commit 2ac1f0eb3887335b7a7e845812956fa436e72a91)