[Bug breakpoints/12435] New: gcc46: prologue skip skips too far

[Bug breakpoints/12435] New: gcc46: prologue skip skips too far

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12435

           Summary: gcc46: prologue skip skips too far
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: breakpoints
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jan.kratochvil@redhat.com
              Host: x86_64-fedora15-linux-gnu
            Target: x86_64-fedora15-linux-gnu


Created attachment 5209
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5209
naive GDB patch

GDB HEAD
gcc-4.6.0-0.3.fc15.x86_64
->
`break internal_error' (that is the function GDB) is never hit.

./gdb -nx ./gdb -ex 'b internal_error' -ex 'disass internal_error'
Breakpoint 1 at 0x48f3cd: file utils.c, line 1242.
Dump of assembler code for function internal_error:
   0x000000000048f39c <+0>:    push   %rbp
   0x000000000048f39d <+1>:    mov    %rsp,%rbp
   0x000000000048f3a0 <+4>:    sub    $0xf0,%rsp
   0x000000000048f3a7 <+11>:    mov    %rdi,-0xd8(%rbp)
   0x000000000048f3ae <+18>:    mov    %esi,-0xdc(%rbp)
   0x000000000048f3b4 <+24>:    mov    %rcx,-0x98(%rbp)
   0x000000000048f3bb <+31>:    mov    %r8,-0x90(%rbp)
   0x000000000048f3c2 <+38>:    mov    %r9,-0x88(%rbp)
   0x000000000048f3c9 <+45>:    test   %al,%al
   0x000000000048f3cb <+47>:    je     0x48f3ed <internal_error+81>
=== breakponit here
   0x000000000048f3cd <+49>:    movaps %xmm0,-0x80(%rbp)
   0x000000000048f3d1 <+53>:    movaps %xmm1,-0x70(%rbp)
   0x000000000048f3d5 <+57>:    movaps %xmm2,-0x60(%rbp)
   0x000000000048f3d9 <+61>:    movaps %xmm3,-0x50(%rbp)
   0x000000000048f3dd <+65>:    movaps %xmm4,-0x40(%rbp)
   0x000000000048f3e1 <+69>:    movaps %xmm5,-0x30(%rbp)
   0x000000000048f3e5 <+73>:    movaps %xmm6,-0x20(%rbp)
   0x000000000048f3e9 <+77>:    movaps %xmm7,-0x10(%rbp)
   0x000000000048f3ed <+81>:    mov    %rdx,-0xe8(%rbp)
=== jump target
   0x000000000048f3f4 <+88>:    movl   $0x18,-0xc8(%rbp)

.debug_line is weird

Fixed by the naive attached GDB patch but it has heavy regressions.
Maybe GCC should be fixed?
There is still missing the prologue end marker.

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[Bug breakpoints/12435] gcc46: prologue skip skips too far

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12435

Jan Kratochvil <jan.kratochvil at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #5209|0                           |1
        is obsolete|                            |

--- Comment #1 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2011-01-26 10:17:36 UTC ---
Created attachment 5214
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5214
Working patch.

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[Bug breakpoints/12435] gcc46: prologue skip skips too far

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12435

--- Comment #2 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2011-01-26 10:26:29 UTC ---
GCC PR: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47471

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[Bug breakpoints/12435] gcc46: prologue skip skips too far

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12435

--- Comment #3 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2011-03-26 07:01:36 UTC ---
gdb-patches post:
http://sourceware.org/ml/gdb-patches/2011-03/msg01108.html

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[Bug breakpoints/12435] gcc46: prologue skip skips too far

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12435

Jan Kratochvil <jan.kratochvil at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
         AssignedTo|unassigned at sourceware    |jan.kratochvil at redhat
                   |dot org                     |dot com

--- Comment #4 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2011-07-22 21:59:23 UTC ---
[patch] workaround gcc46: prologue skip skips too far (PR 12435) #2
http://sourceware.org/ml/gdb-patches/2011-07/msg00645.html

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[Bug breakpoints/12435] gcc46: prologue skip skips too far

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=12435

--- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2011-09-08 15:38:24 UTC ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    jkratoch@sourceware.org    2011-09-08 15:38:16

Modified files:
    gdb            : ChangeLog amd64-tdep.c dwarf2read.c symtab.h 
    gdb/testsuite  : ChangeLog 
Added files:
    gdb/testsuite/gdb.arch: amd64-prologue-xmm.c 
                            amd64-prologue-xmm.exp 
                            amd64-prologue-xmm.s 

Log message:
    gdb/
    PR breakpoints/12435
    * amd64-tdep.c (amd64_skip_prologue): New variables start_pc_sal,
    next_sal, buf, offset and xmmreg.  Advance PC if it sees the PR.
    * dwarf2read.c (process_full_comp_unit): Initialize
    amd64_prologue_line_bug.
    * symtab.h (struct symtab): New field amd64_prologue_line_bug.

    gdb/testsuite/
    PR breakpoints/12435
    * gdb.arch/amd64-prologue-xmm.c: New file.
    * gdb.arch/amd64-prologue-xmm.exp: New file.
    * gdb.arch/amd64-prologue-xmm.s: New file.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.13312&r2=1.13313
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/amd64-tdep.c.diff?cvsroot=src&r1=1.91&r2=1.92
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/dwarf2read.c.diff?cvsroot=src&r1=1.558&r2=1.559
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/symtab.h.diff?cvsroot=src&r1=1.186&r2=1.187
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.2847&r2=1.2848
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.arch/amd64-prologue-xmm.c.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.arch/amd64-prologue-xmm.exp.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.arch/amd64-prologue-xmm.s.diff?cvsroot=src&r1=NONE&r2=1.1

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[Bug breakpoints/12435] gcc46: prologue skip skips too far

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12435

Jan Kratochvil <jan.kratochvil at redhat dot com> changed:

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

--- Comment #6 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2011-09-08 15:41:08 UTC ---
Workarounded.

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