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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug tdep/31507] [gdb, aarch64] FAIL:
 gdb.arch/disp-step-insn-reloc.exp: can_relocate_adr_forward: relocated
 instruction
Date: Mon, 18 Mar 2024 15:11:51 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31507

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |luis.machado at arm dot com
          Component|gdb                         |tdep

--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
This may be a regression due to:
...
commit 0c27188999bfc5bf03536bf44593c4ed8df296c3
Author: Luis Machado <luis.machado@linaro.org>
Date:   Thu Jan 9 16:04:36 2020 -0300

    Fix step-over-syscall.exp failure

    In particular, this one:

    FAIL: gdb.base/step-over-syscall.exp: fork: displaced=3Don:
check_pc_after_cross_syscall: single step over fork final pc

    When ptrace fork event reporting is enabled, GDB gets a PTRACE_EVENT_FO=
RK
    event whenever the inferior executes the fork syscall.

    Then the logic is that GDB needs to step the inferior yet again in orde=
r to
    receive a predetermined SIGTRAP, but no execution takes place because t=
he
    signal was already queued for delivery. That means the PC should stay t=
he
same.

    I noticed the aarch64 code is currently adjusting the PC in this situat=
ion,
    making the inferior skip an instruction without executing it.

    The following change checks if we did not execute the instruction
    (pc - to =3D=3D 0), making proper adjustments for such case.

    Regression tested on aarch64-linux-gnu on the tryserver.

    gdb/ChangeLog:

    2020-01-21  Luis Machado  <luis.machado@linaro.org>
...

Luis, could you take a look?

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