flat assembler - 64bit - how to load bit value and printf it

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sleepsleep

Joined: 05 Oct 2006
Posts: 12937
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sleepsleep 27 Mar 2016, 03:11

this seems troublesome, are there other methods?

Code:

 mov    rdi,f3a
 xor    rax,rax
 call   [SDL_GetVersion]

 mov    rdi,f3

 xor    r8,r8
 mov    r8b,[f3a]
 mov    rsi,r8

 xor    r9,r9
 mov    r9b,[f3b]
 mov    rdx,r9

 xor    r10,r10
 mov    r10b,[f3c]
 mov    rcx,r10

 xor    rax,rax
 call   [printf]

segment readable writeable
f3      db 'SDL version %d.%d.%d',10,0
f3a     db 0
f3b     db 0
f3c     db 0

SDL version 2.0.4

27 Mar 2016, 03:11

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20430
Location: In your JS exploiting you and your system

revolution 27 Mar 2016, 04:36

Is this for Linux or Windows?

27 Mar 2016, 04:36

sleepsleep 27 Mar 2016, 05:15

sorry revolution,
this for linux.

27 Mar 2016, 05:15

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20430
Location: In your JS exploiting you and your system

revolution 27 Mar 2016, 11:20

Moved to Linux.

27 Mar 2016, 11:20

redsock

Joined: 09 Oct 2009
Posts: 434
Location: Australia

redsock 27 Mar 2016, 23:18

Maybe I am missing something here, but at the very least:

Code:

        mov     rdi, f3a
        call    PLT [SDL_GetVersion]

        mov     rdi, f3
        movzx   esi, byte [f3a]
        movzx   edx, byte [f3b]
        movzx   ecx, byte [f3c]
        call    PLT [printf]

rax doesn't need to be defined prior to a normal register-argument function, and the argument order for x86_64 ABI non-syscall is rdi, rsi, rdx, rcx, r8, r9.

Did I miss something?

_________________
2 Ton Digital - https://2ton.com.au/

27 Mar 2016, 23:18

sleepsleep 30 Mar 2016, 11:42

thanks redsock, =)

30 Mar 2016, 11:42

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