Author Topic: Finding Syscalls (Read 5154 times)

Legimet · « **on:** September 09, 2013, 09:43:22 pm »

I would like to know how Ndless syscalls are found. How do you do it?

Lionel Debroux · « **Reply #1 on:** September 10, 2013, 01:41:10 am »

Such things are usually found through comparison of disassembly with older versions, and more disassembly

Legimet · « **Reply #2 on:** September 10, 2013, 06:53:16 pm »

So what file has to be disassembled, and what is a good disassembler?

lkj · « **Reply #3 on:** September 10, 2013, 08:16:57 pm »

You need to disassemble the unencrypted OS. I think the easiest way to get that is dumping the memory to a file in nspire_emu. You can do that with the "wm" command in the integrated debugger.
IDA is the normally used disassembler.

Legimet · « **Reply #4 on:** September 10, 2013, 09:14:41 pm »

OK, I'll take a look at IDA. What arguments should I pass to wm? It looks like you need the start address and the size.

Lionel Debroux · « **Reply #5 on:** September 11, 2013, 01:22:19 am »

The boot1 is loaded at 0 (when execution starts - it's unmapped later), the boot2 and diags are loaded at 0x11800000, the OS is loaded at 0x10000000.

Legimet · « **Reply #6 on:** September 11, 2013, 08:05:22 pm »

Thanks, I got it disassembled.

Author Topic: Finding Syscalls (Read 5154 times)

Legimet

Finding Syscalls

Lionel Debroux

Re: Finding Syscalls

Legimet

Re: Finding Syscalls

lkj

Re: Finding Syscalls

Legimet

Re: Finding Syscalls

Lionel Debroux

Re: Finding Syscalls

Legimet

Re: Finding Syscalls