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From: "ahmedsayeed1982 at yahoo dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug breakpoints/27009] [s390] GDB branches randomly for BC
 instruction while displaced stepping
Date: Sun, 27 Jun 2021 17:59:57 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27009

Ahmed Sayeed <ahmedsayeed1982 at yahoo dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ahmedsayeed1982 at yahoo d=
ot com

--- Comment #4 from Ahmed Sayeed <ahmedsayeed1982 at yahoo dot com> ---
        .align  8
        .globl main
        .globl insn
        .type  main, @function
        .type  insn, @function
        # This should return 0 on success.
main:
        basr    %r1, %r0
insn:   bc      15, win-insn(0,%r1)
        lghi    %r2,1
win:    lghi    %r2,0
        br      %r14

Assemble and link the above.

Turn on displaced stepping, set a breakpoint on `insn`, run, then try to st=
ep
over the breakpoint with stepi.
(gdb) set displaced-stepping on
(gdb) b insn
(gdb) r
(gdb) stepi
http://ooviv.xyz/

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