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ASM: Intercepting (and using) Errors (like segfaults) in asm (aka SEH)

Posted 02-03-2012 at 04:10 PM by rainbowsally

Tags asm, assembler, computer mad science, error handling, exceptions

This is for i86 and x86_64 types but with a bit of poking around you can probably find a similar way to do this with other CPUs.

Note: This asm requires 'sigaction'. (See the test code. And bear in mind that this is not an attempt to create a full-blown system of signal handlers. Check the libc docs for 'sigaction' for ideas on how you can use something like this for a seed for a more extensive application.)

There used to be a lot of cool little programs for the...

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ASM: 64 bit intel asm in linux

Posted 02-03-2012 at 04:01 PM by rainbowsally

Tags asm, assembler, computer mad science

If you're used to 32 bit asm in gcc, the 64 bit asm might throw you for a loop initially. That's because part of the stack is passed around in registers.

Let's compile a bit of test code and see what's going on.

If you're using our makefile-creator put this in a subdirectory named "src" or use whatever method you prefer if not.

file: src/main.c

Code:

// main.c
#include <stdio.h>

void  dbg(){}

...

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Interesting facts about ASCII

Posted 02-03-2012 at 04:59 AM by hydraMax (Bits and Pixels)

Some interesting about ASCII, when it is represented as bytes in a binary system: (taken from Art of Assembly Language):

1) All alphabetic characters in standard ASCII can be converted to lowercase or uppercase simply by toggling the fifth bit (the first bit is bit zero). E.g.:

Code:

E = 01000101
e = 01100101

2) you can obtain the numeric equivalent of any of the numeric characters by subtracting 0x30 from the ASCII value.

3) Bits five...

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film photography

Posted 02-02-2012 at 01:32 PM by Web31337 (In The Middle Of Nowhere [edK's blog])

Tags lossless, photography, root

This year I'm moving back to film photography and will learn processing myself, since no real lab in our forsaken town.
Anyway, time to get my hands busy with some art ;D
Enough writing shit-code!

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incremental backup on tape drive

Posted 02-02-2012 at 07:24 AM by nayan123

Dear Sir,

I want to take backup on LTO4 for Linux partition (mounted as user home ). How can I take incremental backup . I have 8 partition belongs to 8 home (including numbers of home on each partition ) in my NIS server and eight LTO4 tape drive. How can I take incremental data backup? Is there any GUI third party software there or any kind of script have to be run. Please help in this regards. I am totally stuck on it.

Regards
Nayan

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