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Subject: [Bug tdep/28355] [aarch64] regcache.cc:257: A problem internal to
 GDBserver has been detected. Unknown register tag_ctl requested
Date: Wed, 03 Nov 2021 13:04:37 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28355

--- Comment #26 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot g=
nu.org> ---
The gdb-11-branch branch has been updated by Luis Machado
<luisgpm@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3Deb79b2318066=
cafb75ffdce310e3bbd44f7c79e3

commit eb79b2318066cafb75ffdce310e3bbd44f7c79e3
Author: Luis Machado <luis.machado@linaro.org>
Date:   Fri Oct 29 14:54:36 2021 -0300

    [AArch64] Make gdbserver register set selection dynamic

    The current register set selection mechanism for AArch64 is static, bas=
ed
    on a pre-populated array of register sets.

    This means that we might potentially probe register sets that are not
    available. This is OK if the kernel errors out during ptrace, but probi=
ng
the
    tag_ctl register, for example, does not result in a ptrace error if the
kernel
    supports the tagged address ABI but not MTE (PR 28355).

    Making the register set selection dynamic, based on feature checks, sol=
ves
    this and simplifies the code a bit. It allows us to list all of the
register
    sets only once, and pick and choose based on HWCAP/HWCAP2 or other
properties.

    gdb/ChangeLog:

    2021-11-03  Luis Machado  <luis.machado@linaro.org>

            PR gdb/28355

            * arch/aarch64.h (struct aarch64_features): New struct.

    gdbserver/ChangeLog:

    2021-11-03  Luis Machado  <luis.machado@linaro.org>

            PR gdb/28355

            * linux-aarch64-low.cc (is_sve_tdesc): Remove.
            (aarch64_target::low_arch_setup): Rework to adjust the register
sets.
            (aarch64_regsets): Update to list all register sets.
            (aarch64_regsets_info, regs_info_aarch64): Replace NULL with
nullptr.
            (aarch64_sve_regsets, aarch64_sve_regsets_info)
            (regs_info_aarch64_sve): Remove.
            (aarch64_adjust_register_sets): New.
            (aarch64_target::get_regs_info): Remove references to removed
structs.
            (initialize_low_arch): Likewise.

--=20
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