Passing Params From One Proc to Another in x86 Assembly

Asked Mar 16 '15 at 21:49

Active Mar 16 '15 at 21:58

Viewed 35 times

so im having trouble understanding how to pass parameters from one proc to another, both in a different .asm file. Im using TASM on a 64 bit.

So lets say i have a main proc:

extrn   addproc: proc, putint: proc
main    proc    
mov ax, n  ;where n is an integer
call    addproc
main    endp
 end    main

how would i send n to addproc and use it to add 2 to it (just for example)

addproc proc    
add ax, 2
addproc endp
 end    addproc

edited Mar 16 '15 at 21:58

Sam Protsenko

asked Mar 16 '15 at 21:49

ShadowViper

That for example should work fine, even if it isn't the standard convention. – Jester Mar 16 '15 at 21:53
See [this](https://en.wikipedia.org/wiki/Calling_convention#x86) and [this](https://en.wikipedia.org/wiki/X86_calling_conventions#x86-64_calling_conventions). – Sam Protsenko Mar 16 '15 at 21:56
@Jester what is the standard convention? – ShadowViper Mar 16 '15 at 22:07
@User.1 the addproc? or both? – ShadowViper Mar 17 '15 at 00:01
Just addproc. Unless you are using the c runtime library, main should end with a call to the windows exit process function. That's something that higher level languages do for you. See http://stackoverflow.com/a/1023600/2189500 – David Wohlferd Mar 17 '15 at 04:06

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