[Bug gdb/18605] New: single step over ARM Cortex 'udiv' instruction

[Bug gdb/18605] New: single step over ARM Cortex 'udiv' instruction

[m.krivtsov at samsung dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18605

            Bug ID: 18605
           Summary: single step over ARM Cortex 'udiv' instruction
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: m.krivtsov at samsung dot com
  Target Milestone: ---

While hunting for bug in application on ARM development board I met strange GDB
behavior - it fails to single step over 'udiv' instruction complaining about
memory access failure:

> Cannot access memory at address 0xffffffd3

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[Bug gdb/18605] single step over ARM Cortex 'udiv' instruction

[m.krivtsov at samsung dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18605

--- Comment #1 from Mikhail I. Krivtsov <m.krivtsov at samsung dot com> ---
Created attachment 8395
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8395&action=edit
test case

armv7l-tizen-linux-gnueabi-gcc -O0 -Wall -Wextra -o udiv-test udiv-test.c
-save-temps -g

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[Bug gdb/18605] single step over ARM Cortex 'udiv' instruction

[m.krivtsov at samsung dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18605

--- Comment #2 from Mikhail I. Krivtsov <m.krivtsov at samsung dot com> ---
Created attachment 8396
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8396&action=edit
test case log

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[Bug gdb/18605] single step over ARM Cortex 'udiv' instruction

[m.krivtsov at samsung dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18605

Mikhail I. Krivtsov <m.krivtsov at samsung dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kinetik at flim dot org,
                   |                            |ramana.radhakrishnan@codito
                   |                            |.com, rearnsha at arm dot com

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[Bug gdb/18605] single step over ARM Cortex 'udiv' instruction

[qiyao at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18605

Yao Qi <qiyao at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |qiyao at gcc dot gnu.org
           Assignee|unassigned at sourceware dot org   |qiyao at gcc dot gnu.org

--- Comment #3 from Yao Qi <qiyao at gcc dot gnu.org> ---
GDB doesn't handle this instruction correctly during software single step. 
I'll take a look.

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[Bug tdep/18605] single step over ARM Cortex 'udiv' instruction

[qiyao at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18605

Yao Qi <qiyao at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
          Component|gdb                         |tdep

--- Comment #4 from Yao Qi <qiyao at gcc dot gnu.org> ---
Patch is posted here
https://sourceware.org/ml/gdb-patches/2015-06/msg00610.html

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[Bug tdep/18605] single step over ARM Cortex 'udiv' instruction

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18605

--- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Yao Qi <qiyao@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=7b9be803fed8f500b512d5685773c84fffcdf63f

commit 7b9be803fed8f500b512d5685773c84fffcdf63f
Author: Yao Qi <yao.qi@linaro.org>
Date:   Tue Jun 30 09:24:43 2015 +0100

    Handle media instructions in arm software single step.

    This patch fixes PR 18605 which is about incorrectly decoding media
    instructions in software single step.

    gdb:

    2015-06-30  Yao Qi  <yao.qi@linaro.org>

        PR tdep/18605
        * arm-tdep.c (arm_get_next_pc_raw): Break for media
        instructions.

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[Bug tdep/18605] single step over ARM Cortex 'udiv' instruction

[qiyao at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18605

Yao Qi <qiyao at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |7.10

--- Comment #6 from Yao Qi <qiyao at gcc dot gnu.org> ---
Patch is pushed in.  Close this bug.

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