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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug tdep/29405] New: [gdb,tdep/aarch64] FAIL:
 gdb.base/step-over-syscall.exp: vfork: displaced=on/off: pc after stepi
 matches insn addr after syscall
Date: Mon, 25 Jul 2022 15:44:16 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29405

            Bug ID: 29405
           Summary: [gdb,tdep/aarch64] FAIL:
                    gdb.base/step-over-syscall.exp: vfork:
                    displaced=3Don/off: pc after stepi matches insn addr
                    after syscall
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tdep
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

On aarch64, I run into:
...
FAIL: gdb.base/step-over-syscall.exp: vfork: displaced=3Doff: pc after stepi
matches insn addr after syscall
FAIL: gdb.base/step-over-syscall.exp: vfork: displaced=3Don: pc after stepi
matches insn addr after syscall
...

In more detail:
...
(gdb) PASS: gdb.base/step-over-syscall.exp: vfork: displaced=3Doff: syscall
number matches
PASS: gdb.base/step-over-syscall.exp: vfork: displaced=3Doff: find syscall =
insn
in vfork
x/2i $pc^M
=3D> 0xfffff7e31c0c <vfork+12>:   svc     #0x0^M
   0xfffff7e31c10 <vfork+16>:   cmn     x0, #0xfff^M
(gdb) PASS: gdb.base/step-over-syscall.exp: vfork: displaced=3Doff: pc
before/after syscall instruction
stepi^M
[Detaching after vfork from child process 8493]^M
0x0000fffff7e31c14 in vfork () from /lib64/libc.so.6^M
1: x/i $pc^M
=3D> 0xfffff7e31c14 <vfork+20>:   b.cs    0xfffff7e31c1c <vfork+28>  // b.h=
s,
b.nlast^M
(gdb) PASS: gdb.base/step-over-syscall.exp: vfork: displaced=3Doff: stepi v=
fork
insn
print /x $pc^M
$2 =3D 0xfffff7e31c14^M
(gdb) PASS: gdb.base/step-over-syscall.exp: vfork: displaced=3Doff: pc after
stepi
FAIL: gdb.base/step-over-syscall.exp: vfork: displaced=3Doff: pc after stepi
matches insn addr after syscall
...

I suppose the test-case expects to land on the cmn insn, but instead it lan=
ds
on  the next insn.

--=20
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