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From: "dmitry.neverov at jetbrains dot com"
 <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/30446] New: Wrong raw v0 register value on aarch64
Date: Mon, 15 May 2023 07:28:00 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: gdb
X-Bugzilla-Version: 13.1
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: dmitry.neverov at jetbrains dot com
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30446

            Bug ID: 30446
           Summary: Wrong raw v0 register value on aarch64
           Product: gdb
           Version: 13.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: dmitry.neverov at jetbrains dot com
  Target Milestone: ---

When evaluating $v0, gdb/mi returns:

-data-list-register-values --thread 1 --frame 0 --skip-unavailable r 34
^done,register-values=3D[{number=3D"34",value=3D"{d =3D {f =3D {0x000000000=
0000000,
0x0000000000000000}, u =3D {0x2f2f2f2f2f2f2f2f, 0x2f2f2f2f2f2f2f2f}, s =3D
{0x2f2f2f2f2f2f2f2f, 0x2f2f2f2f2f2f2f2f}}, s =3D {f =3D {0x00000000, 0x0000=
0000,
0x00000000, 0x00000000}, u =3D {0x2f2f2f2f, 0x2f2f2f2f, 0x2f2f2f2f, 0x2f2f2=
f2f},
s =3D {0x2f2f2f2f, 0x2f2f2f2f, 0x2f2f2f2f, 0x2f2f2f2f}}, h =3D {f =3D {0x00=
00,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000}, u =3D {0x2f2f, 0x2=
f2f,
0x2f2f, 0x2f2f, 0x2f2f, 0x2f2f, 0x2f2f, 0x2f2f}, s =3D {0x2f2f, 0x2f2f, 0x2=
f2f,
0x2f2f, 0x2f2f, 0x2f2f, 0x2f2f, 0x2f2f}}, b =3D {u =3D {0x2f, 0x2f, 0x2f, 0=
x2f,
0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f}, s =
=3D
{0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x=
2f,
0x2f, 0x2f, 0x2f}}, q =3D {u =3D {0x2f2f2f2f2f2f2f2f2f2f2f2f2f2f2f2f}, s =3D
{0x2f2f2f2f2f2f2f2f2f2f2f2f2f2f2f2f}}}"}]

The first member in the union is itself a union with 3 members:

d =3D {f =3D {0x0000000000000000, 0x0000000000000000}, u =3D {0x2f2f2f2f2f2=
f2f2f,
0x2f2f2f2f2f2f2f2f}, s =3D {0x2f2f2f2f2f2f2f2f, 0x2f2f2f2f2f2f2f2f}}

The first member (f) has a different raw value comparing to 'u' and 's'. Th=
is
seems to be a bug, since the command asked for a raw value which should be =
the
same for all union members.

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