Malloc: what is SysCall analog for malloc?

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narada

Joined: 15 Feb 2008
Posts: 77
Location: Ukraine, Dnepropetrovsk

narada 13 Apr 2009, 16:13

As i see, fasm uses syscall#45 to get memory, but in my sources #45==Sys_Brk...

Can anybody help me with this...

Description:	Syscalls... from my sources... no malloc founded(((	Download
Filename:	syscalls.inc
Filesize:	6.68 KB
Downloaded:	543 Time(s)

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13 Apr 2009, 16:13

asmcoder

Joined: 02 Jun 2008
Posts: 784

asmcoder 13 Apr 2009, 17:36

[content deleted]

Last edited by asmcoder on 14 Aug 2009, 14:52; edited 1 time in total

13 Apr 2009, 17:36

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 13 Apr 2009, 18:26

There is no one actually, if you malloc twice and then dealloc the first malloc you can't SYS_BRK to free without first moving the memory block of the second allocation to the beginning.

You have to implement the memory heap yourself, libc does that way.

Then you have the change of using SYS_MMAP2 which is kinda Windows' VirtualAlloc but extended to support even more (like CreateFileMapping+MapViewOfFile).

13 Apr 2009, 18:26

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 13 Apr 2009, 19:18

http://x86asm.net/articles/memory-allocation-in-linux/index.html

13 Apr 2009, 19:18

narada

Joined: 15 Feb 2008
Posts: 77
Location: Ukraine, Dnepropetrovsk

narada 13 Apr 2009, 19:23

thanks )

13 Apr 2009, 19:23

narada

Joined: 15 Feb 2008
Posts: 77
Location: Ukraine, Dnepropetrovsk

narada 13 Apr 2009, 20:13

P.S. sys_brk is ok, becouse I need only 1 buffer for crypt/decrypt.

13 Apr 2009, 20:13

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