[Bug target/108779] AARCH64 should add an option to change TLS register location to support EL1/EL2/EL3 system registers

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108779

--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Kyrylo Tkachov <ktkachov@gcc.gnu.org>:

https://gcc.gnu.org/g:4389a2d2d0cc639cbeeb8453dc20bf315316d4e3

commit r14-1781-g4389a2d2d0cc639cbeeb8453dc20bf315316d4e3
Author: Kyrylo Tkachov <kyrylo.tkachov@arm.com>
Date:   Tue Jun 13 10:13:55 2023 +0100

    aarch64: Extend -mtp= arguments

    After discussing the -mtp= option with Arm's LLVM developers we'd like to
extend
    the functionality of the option somewhat.
    First of all, there is another TPIDR register that can be used to read the
thread pointer:
    TPIDRRO_EL0 (which can also be accessed by AArch32 under another name) so
it makes sense
    to add -mtp=tpidrr0_el0. This makes the existing arguments el0, el1, el2,
el3 somewhat
    inconsistent in their naming so this patch introduces the more "full" names
    tpidr_el0, tpidr_el1, tpidr_el2, tpidr_el3 and makes the above short names
alias of these new ones.
    Long story short, we preserve backwards compatibility and add a new TPIDR
register to access through
    -mtp that wasn't available previously.
    There is more relevant discussion of the options at
https://reviews.llvm.org/D152433 if you're interested.

    Bootstrapped and tested on aarch64-none-linux-gnu.

    gcc/ChangeLog:

            PR target/108779
            * config/aarch64/aarch64-opts.h (enum aarch64_tp_reg): Add
            AARCH64_TPIDRRO_EL0 value.
            * config/aarch64/aarch64.cc (aarch64_output_load_tp): Define.
            * config/aarch64/aarch64.opt (tpidr_el0, tpidr_el1, tpidr_el2,
            tpidr_el3, tpidrro_el3): New accepted values to -mtp=.
            * doc/invoke.texi (AArch64 Options): Document new -mtp= options.

    gcc/testsuite/ChangeLog:

            PR target/108779
            * gcc.target/aarch64/mtp_5.c: New test.
            * gcc.target/aarch64/mtp_6.c: New test.
            * gcc.target/aarch64/mtp_7.c: New test.
            * gcc.target/aarch64/mtp_8.c: New test.
            * gcc.target/aarch64/mtp_9.c: New test.