[Bug breakpoints/27009] New: [s390] GDB branches randomly for BC instruction while displaced stepping

[Bug breakpoints/27009] New: [s390] GDB branches randomly for BC instruction while displaced stepping

[gfrix98 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

            Bug ID: 27009
           Summary: [s390] GDB branches randomly for BC instruction while
                    displaced stepping
           Product: gdb
           Version: 10.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: gfrix98 at gmail dot com
  Target Milestone: ---

I noticed this problem while working an s390x port.

Minimal testcase:
        .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 step
over the breakpoint with stepi.
(gdb) set displaced-stepping on
(gdb) b insn
(gdb) r
(gdb) stepi

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.

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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[gfrix98 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

Giancarlo Frix <gfrix98 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gfrix98 at gmail dot com
             Target|                            |s390x-ibm-linux-gnu
               Host|                            |s390x-ibm-linux-gnu

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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Joel Brobecker <brobecke@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=296cfb88895e35d8bfc5ce43449e65a92d87354d

commit 296cfb88895e35d8bfc5ce43449e65a92d87354d
Author: Giancarlo Frix <gfrix@rocketsoftware.com>
Date:   Sun Dec 6 14:27:52 2020 +0400

    s390: Fix BC instruction breakpoint handling

    This fixes a long-lived bug in the s390 port.

    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
    the branch target is an absolute address, this would cause the inferior
    to jump around wildly whenever the branch was taken, either crashing it
    or causing it to behave unpredictably.

    It turns out that the logic to handle BC instructions correctly was in
    the code, but that the enum value representing its opcode has always
    been incorrect.

    This patch corrects the enum value to the actual opcode, fixing the
    stepping problem. The enum value is also used in the prologue analysis
    code, so this also fixes a minor bug where more of the prologue would
    be read than was necessary.

    gdb/ChangeLog:

            PR breakpoints/27009
            * s390-tdep.h (op_bc): Correct BC opcode value.

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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[brobecker at gnat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

Joel Brobecker <brobecker at gnat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |brobecker at gnat dot com
   Target Milestone|---                         |10.2

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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The gdb-10-branch branch has been updated by Joel Brobecker
<brobecke@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=47c4623c7587a0008597a4a10a7f32bbac1f7ad4

commit 47c4623c7587a0008597a4a10a7f32bbac1f7ad4
Author: Giancarlo Frix <gfrix@rocketsoftware.com>
Date:   Sun Dec 6 14:30:53 2020 +0400

    s390: Fix BC instruction breakpoint handling

    This fixes a long-lived bug in the s390 port.

    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
    the branch target is an absolute address, this would cause the inferior
    to jump around wildly whenever the branch was taken, either crashing it
    or causing it to behave unpredictably.

    It turns out that the logic to handle BC instructions correctly was in
    the code, but that the enum value representing its opcode has always
    been incorrect.

    This patch corrects the enum value to the actual opcode, fixing the
    stepping problem. The enum value is also used in the prologue analysis
    code, so this also fixes a minor bug where more of the prologue would
    be read than was necessary.

    gdb/ChangeLog:

            PR breakpoints/27009
            * s390-tdep.h (op_bc): Correct BC opcode value.

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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[brobecker at gnat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

Joel Brobecker <brobecker at gnat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Joel Brobecker <brobecker at gnat dot com> ---
patches pushed a while ago. Just forgot to close the PR.

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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[ahmedsayeed1982 at yahoo dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

Ahmed Sayeed <ahmedsayeed1982 at yahoo dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ahmedsayeed1982 at yahoo dot 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 step
over the breakpoint with stepi.
(gdb) set displaced-stepping on
(gdb) b insn
(gdb) r
(gdb) stepi
http://ooviv.xyz/

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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[ucelsanicin at yahoo dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

Ucel Sani <ucelsanicin at yahoo dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ucelsanicin at yahoo dot com

--- Comment #5 from Ucel Sani <ucelsanicin at yahoo dot com> ---
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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[donipah907 at mtlcz dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

james rohan <donipah907 at mtlcz dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |donipah907 at mtlcz dot com

--- Comment #6 from james rohan <donipah907 at mtlcz dot com> ---
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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mark at klomp dot org

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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[focixujo at livinginsurance dot co.uk]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

james robin <focixujo at livinginsurance dot co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |focixujo at livinginsurance dot co
                   |                            |.uk

--- Comment #7 from james robin <focixujo at livinginsurance dot co.uk> ---
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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[mehmetgelisin at aol dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

Mehmet gelisin <mehmetgelisin at aol dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mehmetgelisin at aol dot com

--- Comment #8 from Mehmet gelisin <mehmetgelisin at aol dot com> ---
Actually, I made some progress.  The solib-search-path isn't sufficient, I
think GDB opens /lib/libpthread.so.0 on my system. http://www-look-4.com/  It
would be more appropriate to use "set sysroot" in this situation.  When setting
the sysroot, to the base of what you provided, then the correct
/lib/libpthread.so.0 is loaded by GDB. http://www.compilatori.com/

Another note for those trying to reproduce: if you have a --enable-targets=all
GDB, it will (erroneously) http://www.wearelondonmade.com/ detect the core as
having the Symbian osabi and then tell you that it doesn't know how to handle
cores.  Use "set osabi GNU/Linux" to force it to use that osabi.
http://www.jopspeech.com/

So now the status is that I do get a crash, but I think it's not the same as
you, I think it's earlier. http://joerg.li/ I build with --enable-ubsan, and
that looks like an undefined behabior sanitizer message

$ ../gdb -nx --data-directory=../data-directory   http://connstr.net/           
(gdb) set osabi GNU/Linux 
(gdb) set sysroot /home/simark/build/binutils-gdb/gdb/repo
(gdb) file Foo
Reading symbols from Foo... http://embermanchester.uk/ 
(gdb) core-file Foo-core 
warning: Can't open file http://www.slipstone.co.uk/ 
/media/mmcblk0p1/install/usr/bin/Foo during file-backed mapping note processing
warning: Can't open file /lib/libm-2.21.so during file-backed mapping note
processing
warning: Can't open file /lib/libpthread-2.21.so during file-backed mapping
note processing http://www.logoarts.co.uk/ 
warning: Can't open file /lib/libgcc_s.so.1 during file-backed mapping note
processing
warning: Can't open file /media/mmcblk0p1/install/usr/lib/libstdc++.so.6 during
file-backed mapping note processing
warning: Can't open file /lib/libc-2.21.so http://www.acpirateradio.co.uk/ 
during file-backed mapping note processing
warning: Can't open file /lib/ld-2.21.so during file-backed mapping note
processing
[New LWP 29367]
[New LWP 29368] https://waytowhatsnext.com/ 
warning: Could not load shared library symbols for 5 libraries, e.g.
/lib/libc.so.6.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
https://www.webb-dev.co.uk/ 
warning: Unable to find libthread_db matching inferior's thread library, thread
debugging will not be available.
warning: Unable to find libthread_db matching inferior's thread library, thread
debugging will not be available. http://www.iu-bloomington.com/ 
Core was generated by `./Foo'.
Program terminated with signal SIGABRT, Aborted.
#0  0xb6c3809c in pthread_cond_wait () from
/home/simark/build/binutils-gdb/gdb/repo/lib/libpthread.so.0
[Current thread is 1 (LWP 29367)]
(gdb) bt
/home/simark/src/binutils-gdb/gdb/arm-tdep.c:1551:30: runtime error: shift
exponent 32 is too large for 32-bit type 'unsigned int'
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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[diheto5497 at secbuf dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

diheto <diheto5497 at secbuf dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |diheto5497 at secbuf dot com

--- Comment #9 from diheto <diheto5497 at secbuf dot com> ---
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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[tes.vik1986 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

Kylan <tes.vik1986 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tes.vik1986 at gmail dot com

--- Comment #10 from Kylan <tes.vik1986 at gmail dot com> ---
#6  0x00000100007f721c in target
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<the_sparc64_linux_nat_target>, object=TARGET_OBJECT_MEMORY, annex=0x0,
buf=0x7feffe3b000 "", offset=8791798050744, len=8) at
/home/simark/src/binutils-gdb/gdb/target.c:1415v
http://www.compilatori.com/category/technology/
        #7  0x00000100007f69d4 in target_read_memory (memaddr=8791798050744,
http://www.wearelondonmade.com/services/car-repair-services/ 
myaddr=0x7feffe3b000 "", len=8) at
/home/simark/src/binutils-gdb/gdb/target.c:1218
        #8  0x0000010000758520 in sparc_supply_rwindow (regcache=0x10000fea4f0,
http://www.jopspeech.com/technology/thunderbolt-4/ sp=8791798050736, regnum=-1)
at /home/simark/src/binutils-gdb/gdb/sparc-tdep.c:1960
http://www-look-4.com/travel/new-cars/
        #9  0x000001000076208c in sparc64_supply_gregset (gregmap=0x10000be3190
http://joerg.li/technology/b-class-cars/   <sparc64_linux_ptrace_gregmap>,
regcache=0x10000fea4f0, regnum=-1, gregs=0x7feffe3b230) at
/home/simark/src/binutils-gdb/gdb/sparc64-tdep.c:1974
http://connstr.net/technology/nasa-latest/
        #10 0x0000010000751b64 in sparc_fetch_inferior_registers
(regcache=0x10000fea4f0, regnum=80) at
/home/simark/src/binutils-gdb/gdb/sparc-nat.c:170
http://embermanchester.uk/travel/whatsapp/
        #11 0x0000010000759d68 in sparc64_linux_nat_target::fetch_registers
(this=0x10000fa2c40 <the_sparc64_linux_nat_target>, regcache=0x10000fea4f0,
regnum=80) at http://www.slipstone.co.uk/category/technology/
/home/simark/src/binutils-gdb/gdb/sparc64-linux-nat.c:38
        #12 0x00000100008146ec in target_fetch_registers
(regcache=0x10000fea4f0, regno=80) at
/home/simark/src/binutils-gdb/gdb/target.c:3287 
http://www.acpirateradio.co.uk/health/transportation-security/
        #13 0x00000100006a8c5c in regcache::raw_update (this=0x10000fea4f0,
regnum=80) at /home/simark/src/binutils-gdb/gdb/regcache.c:584
http://www.logoarts.co.uk/computers/printer-types/
        #14 0x00000100006a8d94 in readable_regcache::raw_read
(this=0x10000fea4f0, regnum=80, buf=0x7feffe3b7c0 "") at
/home/simark/src/binutils-gdb/gdb/regcache.c:598
https://waytowhatsnext.com/property/disney-at-home/
        #15 0x00000100006a93b8 in readable_regcache::cooked_read
(this=0x10000fea4f0, https://www.webb-dev.co.uk/services/vaccine-services/ 
regnum=80, buf=0x7feffe3b7c0 "") at
/home/simark/src/binutils-gdb/gdb/regcache.c:690
http://www.iu-bloomington.com/shopping/hatchback-cars/

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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[gulsenenginar at aol dot com]

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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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[vmireskazki at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

vmireskazki at gmail dot com changed:

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                 CC|                            |vmireskazki at gmail dot com

--- Comment #12 from vmireskazki at gmail dot com ---
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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[progonsaytu at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

progonsaytu <progonsaytu at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |progonsaytu at gmail dot com

--- Comment #13 from progonsaytu <progonsaytu at gmail dot com> ---
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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[glassmtech at ukr dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

glassmtech <glassmtech at ukr dot net> changed:

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----------------------------------------------------------------------------
                 CC|                            |glassmtech at ukr dot net

--- Comment #14 from glassmtech <glassmtech at ukr dot net> ---
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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[paneki8601 at dukeoo dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

paneki <paneki8601 at dukeoo dot com> changed:

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----------------------------------------------------------------------------
                 CC|                            |paneki8601 at dukeoo dot com

--- Comment #15 from paneki <paneki8601 at dukeoo dot com> ---
Your article has piqued a lot of positive interest.  I can see why since you
have done such a good job of making it interesting.
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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[xecana8007 at funboxcn dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

tesaso8237 at funboxcn dot comxecana8007@funboxcn.com <xecana8007 at funboxcn dot com> changed:

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----------------------------------------------------------------------------
                 CC|                            |xecana8007 at funboxcn dot com

--- Comment #16 from tesaso8237 at funboxcn dot comxecana8007@funboxcn.com <xecana8007 at funboxcn dot com> ---
Great knowledge, do anyone mind merely reference back to it
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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[xecana8007 at funboxcn dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

--- Comment #17 from tesaso8237 at funboxcn dot comxecana8007@funboxcn.com <xecana8007 at funboxcn dot com> ---
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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[xecana8007 at funboxcn dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

--- Comment #18 from tesaso8237 at funboxcn dot comxecana8007@funboxcn.com <xecana8007 at funboxcn dot com> ---
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[Bug breakpoints/27009] [s390] GDB branches randomly for BC instruction while displaced stepping

[gexed96894 at keagenan dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27009

gexed96894 <gexed96894 at keagenan dot com> changed:

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                 CC|                            |gexed96894 at keagenan dot com

--- Comment #19 from gexed96894 <gexed96894 at keagenan dot com> ---
I read your blog frequently and I just thought I’d say keep up the amazing
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