import dll in PE for ARM

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flx

Joined: 27 Jan 2017
Posts: 4

flx 27 Jan 2017, 10:05

I am trying to write app (.exe) for WinCE on ARM which uses external dll.
How do I import dll in FASMARM for PE files?
I tried this

Code:

format PE

section '.code' code readable executable
<...>

section '.idata' import data readable
library coredll, 'coredll.dll'

import coredll,\
       MessageBoxW,'MessageBoxW'

and it says "illegal instruction" on "library coredll,'coredll.dll'".

27 Jan 2017, 10:05

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20343
Location: In your JS exploiting you and your system

revolution 27 Jan 2017, 10:14

There are four example files for ARM PE in the fasmarm download. This is the second one and perhaps the one you are after:

Code:

; Example of building a WinCE executable using medium level macros

        include 'wince.inc'
        format  PE GUI
        entry   Start

section '.text' code readable executable

proc Start uses[lr]
        apscall MessageBoxW,0,addr Text,addr Caption,0
        ret
endp

Caption du      'ARM example MLI macros',0
Text    du      'Hello ArmCE world',0

section '.idata' import readable writeable

        library coredll,'COREDLL.DLL'
        include 'APICE\COREDLL.INC'

27 Jan 2017, 10:14

flx

Joined: 27 Jan 2017
Posts: 4

flx 27 Jan 2017, 10:42

My fault not to look for example folder. Thank you, it works.

27 Jan 2017, 10:42

flx

Joined: 27 Jan 2017
Posts: 4

flx 15 Feb 2017, 14:32

Ok, one more noob question. Now I need to export some functions from dll. How?
public and export macros don't work for WinCE on ARM (public does nothing, and export doesn't exist)
I also tried to construct export section manually, but I run into the issue that dd instruction always puts 0 after const, thus
dd 1,2 assembles to 0000001 00000000 00000002 00000000 instead of 00000001 00000002. How do I fix that?

15 Feb 2017, 14:32

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20343
Location: In your JS exploiting you and your system

revolution 15 Feb 2017, 14:35

dd defines 64-bit values.
dw defines 32-bit values.
dh defines 16-bit values.
db defines 8-bit values.

BTW: public is not a macro. export is a macro.

15 Feb 2017, 14:35

flx

Joined: 27 Jan 2017
Posts: 4

flx 15 Feb 2017, 15:00

That's unexpected. Compared to ARM's dcb, dcw, dcd, dcq.
But thank you, I took export.inc from FASM for x86, replaced dd's in it for dw and dw for dh, and got working export macro.

15 Feb 2017, 15:00

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20343
Location: In your JS exploiting you and your system

revolution 15 Feb 2017, 15:06

Section 7 of the docs.

15 Feb 2017, 15:06

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