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From: "Neeraj kushwaha" <kushneeraj@gmail.com>
To: gdb@sourceware.org
Subject: value of local variable stored in register
Date: Mon, 04 Feb 2008 04:53:00 -0000	[thread overview]
Message-ID: <df5e18bd0802032053o7dddab55n6b01a369424e727b@mail.gmail.com> (raw)

Hi All,

I am trying to find the value of local variable stored in register.
But I am getting wrong value from gdb.
Here what i am trying

#include<stdio.h>

int main()
{
int *a=0;
volatile register int b=0xabcd;
 register int c=20;
printf("%x\n",b*c);
*a=0;
return 0;
}


------------------------------
-----------------------
GDB info:

Core was generated by `./a.out'.
Program terminated with signal 11, Segmentation fault.
 #0  0x080483e1 in main () at 1.c:9
9       *a=0;
(gdb) info local
a = (int *) 0x0
b = 43981
c = 11305136
(gdb) info reg
eax            0x0      0
ecx            0x0      0
edx            0xac80b0 11305136
 ebx            0xac6ff4 11300852
esp            0xbfc65a00       0xbfc65a00
ebp            0xbfc65a28       0xbfc65a28
esi            0x973ca0 9911456
edi            0x0      0
eip            0x80483e1        0x80483e1 <main+61>
 eflags         0x210282 [ SF IF RF ID ]
cs             0x73     115
ss             0x7b     123
ds             0x7b     123
es             0x7b     123
fs             0x0      0
gs             0x33     51
 (gdb)


The value of local variable is shown as c = 11305136, but actual value is 20.

How to get the correct value of variables which are stored in register.

Regards
Neeraj


             reply	other threads:[~2008-02-04  4:53 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-04  4:53 Neeraj kushwaha [this message]
2008-02-04  5:28 ` Rohit Arul Raj
2008-02-04  6:39   ` Neeraj kushwaha
2008-02-04  7:03     ` Rohit Arul Raj
2008-02-04  7:42       ` Rohit Arul Raj
2008-02-04 20:32 ` Eli Zaretskii
2008-02-05 19:42   ` Jim Blandy
2008-02-05 20:35     ` Eli Zaretskii
2008-02-06  0:27       ` Jim Blandy
2008-02-06  4:18         ` Eli Zaretskii
2008-02-06  6:26           ` Jim Blandy

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