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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug testsuite/26990] New: [-m32] FAIL: gdb.arch/amd64-gs_base.exp:
 print fs_base
Date: Tue, 01 Dec 2020 13:08:26 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26990

            Bug ID: 26990
           Summary: [-m32] FAIL: gdb.arch/amd64-gs_base.exp: print fs_base
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

With target board unix/-m32, I see:
...
FAIL: gdb.arch/amd64-gs_base.exp: print fs_base
FAIL: gdb.arch/amd64-gs_base.exp: print gs_base
FAIL: gdb.arch/amd64-gs_base.exp: info registers fs_base and gs_base with v=
alue
...

In more detail:
...
(gdb) print /x $fs_base^M
$1 =3D void^M
(gdb) FAIL: gdb.arch/amd64-gs_base.exp: print fs_base
print /x $gs_base^M
$2 =3D void^M
(gdb) FAIL: gdb.arch/amd64-gs_base.exp: print gs_base
print $fs_base =3D 2^M
$3 =3D 2^M
(gdb) PASS: gdb.arch/amd64-gs_base.exp: set fs_base
print $gs_base =3D 3^M
$4 =3D 3^M
(gdb) PASS: gdb.arch/amd64-gs_base.exp: set gs_base
info register sys^M
orig_eax       0xffffffff          -1^M
(gdb) FAIL: gdb.arch/amd64-gs_base.exp: info registers fs_base and gs_base =
with
value
...

Using maint print xml-tdesc, we can see the presence of fs_base for -m64:
...
$ gcc hello.c
$ gdb -batch a.out -ex start -ex "maint print xml-tdesc" \
  | grep -i fs_base
    <reg name=3D"fs_base" bitsize=3D"64" type=3D"int" regnum=3D"58"/>
$
...
and -m32:
...
$ gcc hello.c -m32
$ gdb -batch a.out -ex start -ex "maint print xml-tdesc" \
  | grep -i fs_base
$
...

So, we should just make this unsupported for -m32, instead of failing.

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