Hi Jonathan
I am interested in find evaluate the value of argument in the
function. $C displays only the stack, this can be viewed by even pstack.
I also tried <address>::dis this address of frame in the stack. But I
am more interested in analyzing the function argument at this time.
For Example.
My Sample code
================
#include <stdio.h>
int main()
{
char *temp;
strcpy(temp,"Hello Oviya!");
printf("%s\n", temp);
return 0;
}
pstack of corefile
=================
core 'core' of 7253: ./testdump
ff2b30c4 strcpy (0, 2087c, 0, 48656c6c, 22718, ff29bbd0) + 2f8
000106b8 main (1, ffbef8a4, ffbef8ac, 20800, 0, 0) + 18
00010678 _start (0, 0, 0, 0, 0, 0) + 108
Gdb trace
============
gdb testdump core
GNU gdb 6.5
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.
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details.
This GDB was configured as "sparc-sun-solaris2.8"...
Reading symbols from /usr/lib/libc.so.1...done.
Loaded symbols for /lib/libc.so.1
Reading symbols from /usr/lib/libdl.so.1...done.
Loaded symbols for /lib/libdl.so.1
Reading symbols from
/usr/platform/SUNW,Ultra-1/lib/libc_psr.so.1...done.
Loaded symbols for /usr/platform/SUNW,Ultra-5_10/lib/libc_psr.so.1
Reading symbols from /usr/lib/ld.so.1...done.
Loaded symbols for /usr/lib/ld.so.1
Core was generated by `./testdump'.
Program terminated with signal 11, Segmentation fault.
#0 0xff2b30c4 in strcpy () from /lib/libc.so.1
(gdb) bt
#0 0xff2b30c4 in strcpy () from /lib/libc.so.1
#1 0x000106c0 in main () at testdump.c:10
(gdb) f 1
#1 0x000106c0 in main () at testdump.c:10
10 strcpy(temp,"Hello Oviya!");
(gdb) p temp
$1 = 0x0
------------------------------------------------
In this example I am able to identify the arguments of strcpy and trying
to print the value of temp.
mdb trace
============
> $c
libc.so.1`strcpy+0x2f8(0, 2087c, 0, 48656c6c, 22718, ff29bbd0)
main+0x18(1, ffbef8a4, ffbef8ac, 20800, 0, 0)
_start+0x108(0, 0, 0, 0, 0, 0)
> $C
ffbef798 libc.so.1`strcpy+0x2f8(0, 2087c, 0, 48656c6c, 22718, ff29bbd0)
ffbef7d8 main+0x18(1, ffbef8a4, ffbef8ac, 20800, 0, 0)
ffbef840 _start+0x108(0, 0, 0, 0, 0, 0)
This trace has many arguments (6 arguments) how to identify the temp and
its value. What are these 6 arguments means?
Regards,
Oviaprasad D
-----Original Message-----
From: Jonathan Adams [mailto:jonathan.ad...@sun.com]
Sent: Monday, June 22, 2009 9:41 PM
To: Oviaprasad Dharuman (WT01 - Telecom Equipment)
Cc: mdb-discuss at opensolaris.org
Subject: Re: [mdb-discuss] Setting Frame and printing the function
argument
On Mon, Jun 22, 2009 at 09:59:25AM +0530, oviaprasad.dharuman at wipro.com
wrote:
> Hi All,
>
> I am new to this group. I frequently use gdb to debug my core
> files. Can you please any one tell me how to move to particular frame
in
> the stack and how to print the value of argument that was passed to
> particular function.
$C will output the stack, as well as any known arguments. Unlike gdb,
mdb is a mostly-stateless debugger. There's no concept of moving up and
down the stack.
Cheers,
- jonathan
> Regards,
> Oviaprasad D
>
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