David,

the compiler make the rules and know, how to say it to the linker.
So its the best, you declare your assembler functions in C and
generate an assembler output.
Then you can see, how you must pass the parameters
and also the naming conventions for the linker.
And then you can insert your assembler code.
Following an example.
Compile it and then look at "test.a51".

Peter



// generate assembler output:
#pragma src(test.a51)

#include <stdio.h>

// define parameters and return value of the assembler function:
// include this line to call the assembler function from C
char asm_function( unsigned long p1, char idata *p2 );


char asm_function( unsigned long p1, char idata *p2 )
{
// define variables:
char idata asm_vars[10];

// use variables to avoid warning messages:
asm_vars[1] = 0xAA;

// use parameters to avoid warning messages:
p1++;
p2[5] = 0;

// call C functions:
printf("Test: %l %sn", 0x12345678L, "text" );

// use return value to avoid warning messages:
return 0xAA;
}