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donn



Joined: 05 Mar 2010
Posts: 178
donn
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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Post 11 Nov 2015, 16:33
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17352
Location: In your JS exploiting you and your system
revolution
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).
Post 11 Nov 2015, 23:32
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donn



Joined: 05 Mar 2010
Posts: 178
donn
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
Filesize: 534 Bytes
Downloaded: 218 Time(s)

Description: cl c/ c.c
link c.obj asm.obj

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Filename: c.c
Filesize: 349 Bytes
Downloaded: 202 Time(s)

Post 12 Nov 2015, 15:41
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