section alignment / func alignment (x86-64 windows)

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gravvityy

Joined: 17 Oct 2019
Posts: 2

gravvityy 17 Oct 2019, 23:41

is there a way to set section alignment and make sure every function / proc aligns on an address that is a multiple of 16 or must i type "align 16" between each function? is there an easy way to do this (with a macro perhaps?)

Code:

section '.text' code readable writeable executable

edit: and i just realized i posted this in the wrong section, move if possible please Smile

17 Oct 2019, 23:41

donn

Joined: 05 Mar 2010
Posts: 321

donn 18 Oct 2019, 13:18

I use:

Code:

section '.text' code readable writeable executable align 16

Code:

section '.data' data readable writeable align 16

And keep the stack aligned separately.

Code:

        and rsp, -32

Also, I ensure the stack pointer increments and decrements are paired:

Code:

sub rsp, 8*8
...
add rsp, 8*8

mostly just from trial and error, furs mentioned the and rsp, -32 technique, I believe.

18 Oct 2019, 13:18

gravvityy

Joined: 17 Oct 2019
Posts: 2

gravvityy 19 Oct 2019, 01:41

Code:

Y:\andrew\Desktop>fasm test.asm test.exe
flat assembler  version 1.73.16  (1048576 kilobytes memory)
test.asm [17]:
section '.data' data readable writeable align 16
processed: section '.data' data readable writeable align 16
error: extra characters on line.

am i missing something? doesn't seem to like adding 'align 16' on segments (PE64)

19 Oct 2019, 01:41

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