C struct

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donn

Joined: 05 Mar 2010
Posts: 321

donn 11 Nov 2015, 16:33

Hi,

I have been editing Vid's msvc example, thought it may be useful to practice converting a C linked list to Asm as a C library. How should I reference Asm structs? I read that struct members are sequentially ordered in memory, but not sure how to access them or if I should be using the struc directive. If there are any other examples I could examine or documentation to read up on, will certainly take a look. I have been experimenting with many different variations but will keep trying.

Code:

extern struct Struct1{
        int member1;
};

Thanks a lot

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11 Nov 2015, 16:33

revolution
When all else fails, read the source

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

revolution 11 Nov 2015, 23:32

You define the internal structure layout separately from the external reference. Once you have the reference address (from the external label) then it is up to your code how it interprets the data that exists there (perhaps with a 'struc', 'struct' or just plain code).

11 Nov 2015, 23:32

donn

Joined: 05 Mar 2010
Posts: 321

donn 12 Nov 2015, 15:41

Awesome, got it, thanks!

c.h (Not able to upload attachment of this, "The Extension h is not allowed"):

Code:


struct Struct1{
        int member1;
} struct1;

Code:

extern struct Struct1 struct1;

Code:

public struct1 as '_struct1'

Code:

        struc Struct1 member1{
                .member1 dd member1
        }

        struct1 Struct1 77

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Filename:	asm.asm
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Description:	cl c/ c.c link c.obj asm.obj	Download
Filename:	c.c
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12 Nov 2015, 15:41

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