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From: "gulsenenginar at aol 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: Sat, 09 Oct 2021 11:00:50 +0000 [thread overview]
Message-ID: <bug-27009-4717-98VbWJ5hqZ@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-27009-4717@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=27009
Gulsen Engin <gulsenenginar at aol dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |gulsenenginar at aol dot com
--- Comment #11 from Gulsen Engin <gulsenenginar at aol dot com> ---
Minimal testcase: http://www.compilatori.com/category/computers/
.align 8
.globl main http://www.acpirateradio.co.uk/category/property/
.globl insn
.type main, @function http://www.logoarts.co.uk/category/services/
.type insn, @function
# This should return 0 on success.
http://www.slipstone.co.uk/tech/nvidia-and-samsung/
main:
basr %r1, %r0
insn: bc 15, win-insn(0,%r1)
http://embermanchester.uk/category/technology/
lghi %r2,1
win: lghi %r2,0
br %r14
http://connstr.net/category/tech/
Assemble and link the above.
Turn on displaced stepping, set a breakpoint on `insn`, run, then try to step
over the breakpoint with stepi. http://joerg.li/computers/latest-car-deals/
(gdb) set displaced-stepping on
(gdb) b insn http://www.jopspeech.com/services/surface-duo/
(gdb) r
(gdb) stepi http://www.wearelondonmade.com/tech/nvidia-and-samsung/
instead of branching to `win`, gdb will branch to an apparently random nearby
address, and the inferior will generally crash. This problem is present in all
versions of GDB I've tested.
https://waytowhatsnext.com/computers/what-is-ssl-certificate/
When trying to step over a breakpoint set on a BC (branch on condition)
instruction with displaced stepping on IBM Z, gdb would incorrectly
adjust the pc regardless of whether or not the branch was taken. Since
http://www.iu-bloomington.com/technology/advantages-of-online-banks/
the branch target is an absolute address, this would cause the inferior
to jump around wildly whenever the branch was taken, either crashing it
https://komiya-dental.com/sports/telegram/
or causing it to behave unpredicta
When trying to step over a breakpoint set on a BC (branch on condition)
http://www-look-4.com/property/houses-in-france/
instruction with displaced stepping on IBM Z, gdb would incorrectly
adjust the pc regardless of whether or not the branch was taken. Since
the branch target is an absolute address,
https://www.webb-dev.co.uk/sports/sports-and-health/ this would cause the
inferior
to jump around wildly whenever the branch was taken, either crashing it
or causing it to behave unpredicta
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next prev parent reply other threads:[~2021-10-09 11:00 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-03 23:07 [Bug breakpoints/27009] New: " gfrix98 at gmail dot com
2020-12-03 23:09 ` [Bug breakpoints/27009] " gfrix98 at gmail dot com
2020-12-06 10:28 ` cvs-commit at gcc dot gnu.org
2020-12-06 10:29 ` brobecker at gnat dot com
2020-12-06 10:31 ` cvs-commit at gcc dot gnu.org
2021-01-31 6:26 ` brobecker at gnat dot com
2021-06-27 17:59 ` ahmedsayeed1982 at yahoo dot com
2021-08-10 12:45 ` ucelsanicin at yahoo dot com
2021-09-02 11:06 ` donipah907 at mtlcz dot com
2021-09-02 11:15 ` mark at klomp dot org
2021-09-06 9:09 ` focixujo at livinginsurance dot co.uk
2021-09-10 19:38 ` mehmetgelisin at aol dot com
2021-09-22 10:11 ` diheto5497 at secbuf dot com
2021-09-26 13:31 ` tes.vik1986 at gmail dot com
2021-10-09 11:00 ` gulsenenginar at aol dot com [this message]
2021-10-17 19:51 ` vmireskazki at gmail dot com
2021-10-19 7:15 ` progonsaytu at gmail dot com
2021-10-24 10:02 ` glassmtech at ukr dot net
2021-11-06 21:13 ` paneki8601 at dukeoo dot com
2021-11-16 19:08 ` xecana8007 at funboxcn dot com
2021-11-16 19:12 ` xecana8007 at funboxcn dot com
2021-11-16 19:15 ` xecana8007 at funboxcn dot com
2021-11-22 7:39 ` gexed96894 at keagenan dot com
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