how do i output object files?

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luna7ic

Joined: 26 Oct 2017
Posts: 3

luna7ic 26 Oct 2017, 22:00

i need to output my fasm code tp object code so i can link it to my c code.
how do i do that? I plan on doing inline assembly using fasm.

26 Oct 2017, 22:00

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20448
Location: In your JS exploiting you and your system

revolution 26 Oct 2017, 22:24

The output type is controlled by format.

Code:

; example of making Win32 COFF object file

format MS COFF

extrn '__imp__MessageBoxA@16' as MessageBox:dword

section '.text' code readable executable

 public _demo

 _demo:
        push    0
        push    _caption
        push    _message
        push    0
        call    [MessageBox]
        ret

section '.data' data readable writeable

 _caption db 'Win32 assembly',0
 _message db 'Coffee time!',0

See the "EXAMPLES" folder for more examples of output formants.

26 Oct 2017, 22:24

Kenneth Zheng

Joined: 30 Apr 2008
Posts: 14
Location: Shanghai, China

Kenneth Zheng 27 Oct 2017, 06:59

another method is used DLL file. Please reference below steps for it:
1. Based on C:\fasm\examples\DLL\errormsgs.asm to cto insert your ASM API into it and then create export API　in the DLL file.
2. C code uses two APIs "LoadLibrary() and GetProcAddress()" API to invoke DLL's API.

Thanks.

Kenneth Zheng

_________________
Pure Assembly Language Funs

27 Oct 2017, 06:59

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