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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug tdep/31453] [gdb/tdep, arm] FAIL: gdb.arch/pr25124.exp:
 disassemble thumb instruction (1st try)
Date: Wed, 20 Mar 2024 08:56:47 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31453

--- Comment #3 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom de Vries <vries@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3D8a61ee551ce3=
059f602fee1e576af08c03f991bc

commit 8a61ee551ce3059f602fee1e576af08c03f991bc
Author: Tom de Vries <tdevries@suse.de>
Date:   Wed Mar 20 09:57:49 2024 +0100

    [gdb/symtab] Workaround PR gas/31115

    On arm-linux, with gas 2.40, I run into:
    ...
    (gdb) x /i main+8^M
       0x4e1 <main+7>:      vrhadd.u16      d14, d14, d31^M
    (gdb) FAIL: gdb.arch/pr25124.exp: disassemble thumb instruction (1st tr=
y)
    ...

    This is a regression due to PR gas/31115, which makes gas produce a low=
_pc
    with the thumb bit set (0x4d8 & 0x1):
    ...
     <1><24>: Abbrev Number: 2 (DW_TAG_subprogram)
        <25>   DW_AT_name        : main
        <29>   DW_AT_external    : 1
        <29>   DW_AT_type        : <0x2f>
        <2a>   DW_AT_low_pc      : 0x4d9
        <2e>   DW_AT_high_pc     : 12
    ...

    The regression was introduced in 2.39, and is also present in 2.40 and
2.41,
    and hasn't been fixed yet.

    Work around this in read_func_scope, by using gdbarch_addr_bits_remove =
on
    low_pc and high_pc.

    Tested on arm-linux and x86_64-linux.

    PR tdep/31453
    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=3D31453

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