Lab46 Wiki

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
**PNC the 3**

Alright, so PNC3!! So guys the goal is to create a **primereg** in assembly. It should be possible with our current knowledge in assembly. If you would like, and just primereg isn't enough for you by all means go further and do things such as:

  * **primeregb**
  * **primeregs**
  * **primeregbs**
  * **primerega**
  * **primeregba**
  * **primeregboa**

good luck guys! Have fun! \\

** compiling **
<code>
nasm -f elf64 -o pnc3.o pnc3.asm 
ld -o pnc3 pnc3.o 
</code>

** gdb commands **
  * show registers
  * info registers  (shows info on register)
     * this can be shortened as an example to: i r eax
  * set disassembly-flavor intel  (sets assembly flavor up to intel)  
  * break _start:  (start of program, go step by step from here)
  * layout asm
  * ni - next instruction
  * si - step instruction


example of displaying registers: \\
<cli>
break _start \\Breakpoint 1, 0x0000000000400080 in _start ()
(gdb) display/x $rax
1: /x $rax = 0x0
(gdb) display/x $rbx
2: /x $rbx = 0x0
(gdb) display/x $rcx
3: /x $rcx = 0x0
(gdb) display/x $rip
4: /x $rip = 0x400080
(gdb)
si
</cli>
Helpful sources:

Register usage: {{:notes:comporg:projects:reg.png?400|}}
Take note of registers r12-r15

http://blog.rchapman.org/posts/Linux_System_Call_Table_for_x86_64/ \\

https://cs.brown.edu/courses/cs033/docs/guides/x64_cheatsheet.pdf \\

https://www.cs.uaf.edu/2017/fall/cs301/reference/x86_64.html \\

http://www.egr.unlv.edu/~ed/assembly64.pdf \\

http://www.felixcloutier.com/x86/ (large list of assembly instructions) \\

**kupala nasm tutorial!! great tutorial!!** https://www.youtube.com/watch?v=VQAKkuLL31g&list=PLetF-YjXm-sCH6FrTz4AQhfH6INDQvQSn
Lab46 Wiki

User Tools

Site Tools

Page Tools
