Basic doubts in assembly programming

createdon2003 — Wed, 31 Oct 2007 19:21:19 GMT

I am programming on msc8144, sc3000 architecture.

In assembly programming can someone explain stack based calling convention?
Mainly I would like to know how offsets (from stack pointer) for input arguments and local variables is computed.

void f1()
{
word16 ar1[ ];
word16 ar2[ ];
word16 ar3[ ];
word16 i,j,k;
/* function body*/
f2(ar1[ ], ar2[ ], ar3[ ], i, j ,k);
/* function body*/
}

f2(word16 a1[ ], word16 a2[ ], word16 a3[ ], word16 i, word16 j, word16 k)
{
word16 b1[ ];
word16 b2[ ];
word16 b3[ ];

/*function body*/
}

Now if I want to write function f2 in assembly, how to create memory to store temporary arrays b1, b2, b3.
how to access input arguments to the function.

It would be helpful if someone can provide resource links, where assembly programming examples are given.

Thank you
Naveen

Re: Basic doubts in assembly programming

CrasyCat — Fri, 02 Nov 2007 15:25:59 GMT

Hello

For StarCore there is a ABI defining how parameters should be passed to a function.

Please look at {Install}\Help\PDF\MNSC100ABI.pdf chapter "1.6 Function Calling Sequence".

Around allocating space for local variable, you need to reserve some space on the stack.

I would recommend you to check "Keep .sl File" check box in the Compiler panel and to look at how the compiler is managing the local variables.

Alternatively you can write your function in inline assembly. Please refer to {Install}\Help\PDF\StarCore_C_Compiler_User_Guide.pdf chapter "Mixing C, Assembly Code".

I hope this helps.

CrasyCat

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Basic doubts in assembly programming

Re: Basic doubts in assembly programming