Learning linux gas for 32bit architectures. AT&T is fairly universal when
disassembling which is why I chose this. However, intel syntax is used in
windows and GNU tools provide an option for it. So the real reason is so
I can just jump in w/o having to mess with settings :P
Currently using gcc -S -m32 -O0 code.c to produce 32bit assembly output
and studying that to learn since I haven't found any really good tutorials
on this online.
Explanation on the flags:
-S: produce assembly output
-m32: target 32bit architecture
-O0: Optimization set to 0, [0-3]
To produce an executable is no problem. gcc -m32 -g code.s or you can
take the long route and type this
as code.s -o code.o
ld code.o -o runexe
main.c & Makefile included is my test outputter. Running make or
make all will produce assembly output
You can also check the exit code of a program by running echo $?
<3 GDB is love, GDB is life <3
My most used commands are:
disass
info registers
x $gpr + # (gpr = general purpose register)
-
Addresing Modes
http://docs.oracle.com/cd/E19120-01/open.solaris/817-5477/ennby/index.html -
Jumps & Flags
www.unixwiz.net/techtips/x86-jumps.html