Dynamic memory allocation in Assembly

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estrang

Joined: 02 Nov 2005
Posts: 38

estrang 12 Nov 2005, 11:40

How do you dynamically allocate memory in assembly?

I mean when i use buffers in assembly i have to do

Code:

db 0Fh dup( 00h )

, which consumes a lot of the apps size.

How do you dynamically allocate memory and use it on runtime??

12 Nov 2005, 11:40

vbVeryBeginner

Joined: 15 Aug 2004
Posts: 884
Location: \\world\asia\malaysia

vbVeryBeginner 12 Nov 2005, 12:24

Code:

rb 0xF

12 Nov 2005, 12:24

Eoin

Joined: 16 Jun 2003
Posts: 68
Location: Ireland

Eoin 12 Nov 2005, 15:54

For Dynamic allocation, i.e when the size can only be determined at runtime and not compile time there are a number of functions available depending on OS.

If your linking with a C library you can use malloc. If not you can use HeapAlloc when in windows, I'm not sure about the Linux/*BSD functions.

12 Nov 2005, 15:54

ccrayne

Joined: 17 May 2005
Posts: 12

ccrayne 12 Nov 2005, 20:25

In DOS, use INT 21h with AH = 48h and BX = number of paragraphs requested.

12 Nov 2005, 20:25

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