Hi Eric,
If you use a typedef, and then declare the typedef with the pragma linkage,
it -should- do it for you.
We do that all the time with the Dignus compilers.
For example, to invoke the and OS-style linkage that passed
an integer (by-reference) and return a value with a pointer, you
might do this:
typedef void os_func_type(int val, int *retval_ptr);
#pragma linkage(os_func_type, OS)
os_func_type *os_func_ptr;
Then assign to address to the function pointer (in your case
it would be the result of the LOAD) and just make your function
calls through the pointer.
os_func_ptr = entry-point-from-load
The compiler we generate code that passes the address of
copy for the first parameter (since C is pass-by-value, a copy
of the integer is made, as i was declared by-value), and then
address of an int for the return value. The compiler will also
set the VL-bit on the last parm; then load the pointer into R15
and BALR-away.
os_func_ptr(val, &retval);
I'm pretty sure that would work for the IBM XLC compiler too.
- Dave Rivers -
==
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