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Old 04-03-2003, 06:17 AM   #1
Registered: Mar 2003
Location: Kurnool, India.
Distribution: Redhat 9
Posts: 67

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Using asm code in C program.

How can we access asm code in C.

suppose one file functions.asm contains all the functions defined.
And main.c contains the program.
Do I need to access the asm functions in my program using 'asm' keyword
or I can just use the function name given in the asm file.
Or do I need to compile the asm file and use it as include at the time of compilation of my main program.

Please do reply a sequence.
Though I did lot of programming in C, I never tried this.
Old 04-03-2003, 07:20 AM   #2
Registered: Mar 2002
Location: Ukraine, Kiev
Distribution: Mandrake 7.2
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It depends on what os/compiler you use.
In general you can declare functions in header file, define functions, in asm file and use them in c file. In this way you have to link object files generated from c and asm files together. But there are many specific things which is depend of os/compiler. For example in DOS/Windows you have to define function name in asm file with first char '_' (i.e. suppose in header you define "int dosomething()" but in asm defination yu have to declare it as "_dosomething" ).
Keyword asm (or __asm, _asm in some C dialects) is used to write asm commands direct in C code, i.e __asm cli;. In many cases this approach is preffer because can avoid many specific troubles. From other side embedded assembler can introduce some restriction to use some futures of assembler language (restricted command set etc.).
Old 04-03-2003, 11:00 PM   #3
Registered: Mar 2003
Location: Kurnool, India.
Distribution: Redhat 9
Posts: 67

Original Poster
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Thanx tda, the information given is really good. I think now I have to give a try to check my skills.


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