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any gdb script to parse string?

how can i get the addr following "saved eip" and "Arglist at" from the output of "info f" in gdb?

Code:

(gdb) info f

Stack level 9, frame at 0xbfffcc78:

 eip = 0x42d5310e in EvalAll (epeval.c:218); saved eip 0x42d53c3a

 called by frame at 0xbfffccb8, caller of frame at 0xbfffcc38

 source language c.

 Arglist at 0xbfffcc78, args: r=0x894a488, sArg=0x89f6e83 " $$searchdata{starfirst} ", flags=0, sName=0x89ffe28 "$衆224\b\001", 

    pRet=0xbfffcca8

 Locals at 0xbfffcc78, Previous frame's sp is 0x0

 Saved registers:

  ebx at 0xbfffcc6c, ebp at 0xbfffcc78, esi at 0xbfffcc70, edi at 0xbfffcc74, eip at 0xbfffcc7c

I wanna use the two addr in my gdb script.

Quote:

Originally Posted by jackandking (Post 3366016)

how can i get the addr following "saved eip" and "Arglist at" from the output of "info f" in gdb?

Code:

(gdb) info f

Stack level 9, frame at 0xbfffcc78:

 eip = 0x42d5310e in EvalAll (epeval.c:218); saved eip 0x42d53c3a

 called by frame at 0xbfffccb8, caller of frame at 0xbfffcc38

 source language c.

 Arglist at 0xbfffcc78, args: r=0x894a488, sArg=0x89f6e83 " $$searchdata{starfirst} ", flags=0, sName=0x89ffe28 "$衆224\b\001", 

    pRet=0xbfffcca8

 Locals at 0xbfffcc78, Previous frame's sp is 0x0

 Saved registers:

  ebx at 0xbfffcc6c, ebp at 0xbfffcc78, esi at 0xbfffcc70, edi at 0xbfffcc74, eip at 0xbfffcc7c

I wanna use the two addr in my gdb script.

You can redirect output to the file, then process file with any external program (invoked by the gdb's shell call), write output in the form of

$name1 = value1
$name2 = value2

to the file, source this file to gdb and use those variables.

Tricky and ugly but doable.
You can have a look for something resembling here:
http://statifier.sf.net

Statifier is a program that convert dynamically linked executable to pseudo-static.
It uses gdb to dump process memory and registers to the files as part of statifying process

Files src/gdb_runner.gdb and src/statifier.gdb are examples of such tricks.
PLease notes, that those files are preprocessed with sed before be used, but anyway you should get idea.

EDIT: Statifier don't use gdb any more, but files mentioned above still can be found in the release < 1.7.0 or in SVN - tag 1.6.15

It's very useful to me,
thanks a lot.

Quote:

Originally Posted by jackandking (Post 3367614)

It's very useful to me,
thanks a lot.

You are welcome