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C and Assembly


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  #1  
Old March 29th, 2006, 03:31 AM
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C and Assembly
I am new to the assembly world. I am trying to use assembly with C . how do i integrate assemmbly with C.
How do i pass the parameter.
How do i access the arrays passed to the assemlby part of the program.
I am using İntel- base and NASM under Linux
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Old March 29th, 2006, 09:20 AM
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Old March 30th, 2006, 09:25 AM
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I know this isn't really what you asked, but GCC has an inline assembler option.

There's a little tutorial about it here:
http://www.ibiblio.org/gferg/ldp/GC...mbly-HOWTO.html

To enter an ASM block in C code with GCC, you could do:
Code:
char* str = "abc %i\n";

int main() {
    ...
    __asm__ (
        "pushl $123\n"
        "pushl str\n"
        "call printf\n"
    );
    ...
}

Which would printf abc 123.

There is also an extended ASM option which allows you to use C variables, where the compiler will translate the actual addresses and such for you, then insert them into your given ASM code template.

Syntax is a little different from Intel's, but it's not too bad, and it's convenient to use inline to experiment.
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Old March 30th, 2006, 09:50 AM
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Here are some good tutorials on Assembly languages :

http://www.freeprogrammingresources.com/assembly.html

Most particularly, I recommend you to read http://savannah.nongnu.org/download/pgubook/ProgrammingGroundUp-1-0-booksize.pdf
Although it uses the AT&T syntax, it provides a lot of useful information, especially on the C calling convention and stackframe

Here is a link to another book with examples written in NASM : http://www.drpaulcarter.com/pcasm/
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