Re: GDB record patch 0.1.1 for GDB-6.6 release (It make I386 and MIPS GDB support Reversible Debugging)

[Michael Snyder <msnyder at specifix dot com>]

Teawater, 

I just want to acknowledge your contribution.  I've noticed your
postings, just have not had time to sit down and pore over them.

I am very interested in what you are doing, and I hope that I or
another maintainer can take the time to look it over soon -- hard
to make promises, since it is rather different from anything 
that most of us are actively engaged on.

Cheers,
Michael

On Thu, 2007-11-22 at 17:13 +0800, Tea wrote:
> Hi everybody,
> 
> GDB record patch disassemble the instruction that will be executed to
> get which memory and register will be changed and record them to
> record all the program running message.
> The main change of this version record patch is support the I386
> instructions(System call, floating-point instructions and SSE
> instructions are still not support).
> The work of next stage is make GDB record patch support I386-Linux system call.
> Please give me your thought about the "record" and help me test it.
> Thanks a lot.
> BTW, I am sorry I compress the patch because it is too big to send to
> the maillist.
> 
> To make and install the GDB record patch 0.1.1 with GDB-6.6:
> tar vxjf gdb-6.6.tar.bz2
> bunzip2 gdb-6.6-record-0.1.1.patch.bz2
> patch -p0 < gdb-6.6-record-0.1.1.patch
> mkdir bgdb
> cd bgdb
> ../gdb-6.6/configure
> make
> make install
> 
> The following is how to use the record:
> cat 1.c
> int     a = 0;
> int
> cool ()
> {
>         a += 3;
> 
>         return (a);
> }
> int
> main()
> {
>         int     b = 0;
>         int     c = 1;
> 
>         b = cool ();
> 
>         c += 1;
>         a -= 2;
> 
>         return (0);
> }
> gcc -g 1.c
> gdb a.out
> GNU gdb 6.6
> Record 0.1.1
> Copyright (C) 2006 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i686-pc-linux-gnu"...
> Using host libthread_db library "/lib/tls/libthread_db.so.1".
> Setting up the environment for debugging gdb.
> Function "internal_error" not defined.
> Make breakpoint pending on future shared library load? (y or [n])
> [answered N; input not from terminal]
> Function "info_command" not defined.
> Make breakpoint pending on future shared library load? (y or [n])
> [answered N; input not from terminal]
> /home/xxx/rec/bgdb/gdb/.gdbinit:8: Error in sourced command file:
> No breakpoint number 0.
> (gdb) b main
> Breakpoint 1 at 0x8048331: file 1.c, line 12.
> (gdb) r
> Starting program: /home/xxx/rec/bgdb/gdb/a.out
> 
> Breakpoint 1, main () at 1.c:12
> 12              int     b = 0;
> (gdb) p a
> $1 = 0
> (gdb) p b
> During symbol reading, incomplete CFI data; unspecified registers
> (e.g., eax) at 0x8048324.
> $2 = 134513500
> (gdb) p c
> $3 = 7610400
> (gdb) rec
> record: record and reverse function is started.
> (gdb) n
> 13              int     c = 1;
> (gdb)
> 15              b = cool ();
> (gdb)
> 17              c += 1;
> (gdb) p a
> $4 = 3
> (gdb) p b
> $5 = 3
> (gdb) p c
> $6 = 1
> (gdb) n
> 18              a -= 2;
> (gdb)
> 20              return (0);
> (gdb) p a
> $7 = 1
> (gdb) p b
> $8 = 3
> (gdb) p c
> $9 = 2
> (gdb) rev
> record: GDB is set to reverse debug mode.
> (gdb) s
> 18              a -= 2;
> (gdb)
> 0x0804834a      17              c += 1;
> (gdb) p a
> $10 = 3
> (gdb) p b
> $11 = 3
> (gdb) p c
> $12 = 1
> (gdb) s
> 0x08048344      15              b = cool ();
> (gdb) s
> cool () at 1.c:5
> 5               a += 3;
> (gdb) p a
> $13 = 0
> (gdb) s
> 0x08048311      4       {
> (gdb)
> main () at 1.c:15
> 15              b = cool ();
> (gdb)
> 13              int     c = 1;
> (gdb) p a
> $14 = 0
> (gdb) p b
> $15 = 0
> (gdb) p c
> $16 = 7610400
> (gdb) rev
> record: GDB is set to normal debug mode.
> (gdb) n
> 15              b = cool ();
> (gdb)
> 17              c += 1;
> (gdb) n
> 18              a -= 2;
> (gdb) p a
> $4 = 3
> (gdb) p b
> $5 = 3
> (gdb) p c
> $6 = 2
> (gdb) quit
> The program is running.  Exit anyway? (y or n) y
> record: record and reverse function is stopped.
> You can find out the change of the values of "a", "b" and "c" when the
> GDB normal debug and reverse debug.
> 
> Thanks,
> teawater
> 
> 
> Signed-Off-By: Teawater Zhu <teawater@gmail.com>