Scroll wheel issue in Ubuntu guest on Vmware Fusion

The scroll wheel on my Logitech USB mouse was not working in the Ubuntu 7.10 guest running on VMware Fusion.

Fix: change the driver in the mouse section of /etc/X11/xorg.conf from ps/2 to imps/2

Ref : http://communities.vmware.com/message/780209

uid and gid

use the id command to find out the uid and the gid of a user.
example:

% id root
uid=0(root) gid=0(root) groups=0(root)

Printing code at a PC value in gdb

x /i $pc

Then you can

si

to continue stepping, along with a display of the instruction corresponding to the PC

Problem in searching with Eclipse

Workspace/Project search for text, on my Eclipse CDT projects, returned "0 matches" in spite of the searched text being present.

The problem was that my default VM was set to the GNU Java VM.
Setting this to the Sun VM solved the problem.

http://ubuntuforums.org/showthread.php?t=201378 shows how to install the Sun VM on Ubutnu and make Eclipse use it.

Intel syntax in gdb

You can get gdb to use Intel syntax to display assembly code by using

set disassembly-flavor intel

Disassembing an elf binary on x86 Linux

An ELF binary can be disassembled on an x86 Linux machine using objdump .

1. compile your file using gcc

> gcc test.c -o test

2. get the objdump

>objdump test -f -D --disassembler-options intel

This would print the assembly equivalent of the elf binary test .

The -f option displays summary information from the section headers of the object file. This displays the starting address from where the program would begin execution.

--disassembler-options intel prints the output assembly in intel format

See the man pages of objdump for a comprehensive explanation of the options.

The target of instructions like

jmp DWORD PTR ds:0x80496b0

can be obtained by

>objdump -R test

I will post more information about disassembling in a future post.