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Operating Systems AIX Gdb on a 64 bit executable - cannot access memory Post 302916156 by bagpussnz on Monday 8th of September 2014 12:43:10 AM
Old 09-08-2014
Gdb on a 64 bit executable - cannot access memory

Hi,
Can anyone explain this please.....

A simple test program...

### snip
Code:
#include <stdio.h>

main() {
static int n;

n = 6;

printf("hello %d\n", n);
n=7;
}

### snip

64 bit compile/link....


Code:
$ export OBJECT_MODE=64
$ cc -g -o hello hello.c
$ gdb ./hello
(gdb) b 8
Breakpoint 1 at 0x1000004a4: file hello.c, line 8.
(gdb) r
Starting program: /src/kiwi_7.94_01oct2014/hello 

Breakpoint 1, main () at hello.c:8
8       printf("hello %d\n", n);
(gdb) p n
Cannot access memory at address 0x10000708
(gdb)

If you take off the "static" on line 4, it works fine. Smilie

Also it works fine in 32 bit mode.
Moderator's Comments:
Mod Comment Please use CODE tags when displaying sample input, output, and code segments.

Last edited by Don Cragun; 09-08-2014 at 04:42 PM.. Reason: Add CODE tags.
 

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GZEXE(1)						      General Commands Manual							  GZEXE(1)

NAME
gzexe - compress executable files in place SYNOPSIS
gzexe name ... DESCRIPTION
The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a penalty in performance). For example if you execute ``gzexe /usr/bin/gdb'' it will create the following two files: -rwxr-xr-x 1 root root 1026675 Jun 7 13:53 /usr/bin/gdb -rwxr-xr-x 1 root root 2304524 May 30 13:02 /usr/bin/gdb~ /usr/bin/gdb~ is the original file and /usr/bin/gdb is the self-uncompressing executable file. You can remove /usr/bin/gdb~ once you are sure that /usr/bin/gdb works properly. This utility is most useful on systems with very small disks. OPTIONS
-d Decompress the given executables instead of compressing them. SEE ALSO
gzip(1), znew(1), zmore(1), zcmp(1), zforce(1) CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the PATH environment variable to find gzip and some standard utilities (basename, chmod, ln, mkdir, mktemp, rm, sleep, and tail). BUGS
gzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases, using chmod or chown. GZEXE(1)
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