Passing Data From C to Assembly

Brian Kramer

I've been trying to pass integers from a C program to an assembly program with no success. I've got it working with pointers though. Can anyone push me in the right direction? The working example with pointers is provided below. Also, the printf function doesn't print to console which is confusing as well.

C file:

#include <stdio.h>

int* func(int*, int*, int*);

int main()
{
	int i = 12;
	int j = 13;
	int k = -5;

	int *p = func(&i,&j,&k);
	printf("%d\n", *p);

	return 0;
}

Assembly:

.text

		.def _func
_func	.cproc M, Y, Z

		.reg m
		.reg y
		.reg z
		.reg ans

		LDH *M,m
		LDH *Y,y
		LDH *Z,z

		ADD m, y, ans
		ADD ans, z, ans

		.return ans
		.endproc

over 10 years ago

0 George Mock over 10 years ago

TI__Guru**** 251180 points

Brian Kramer said:
The working example with pointers is provided below.

Please show the broken example with integers.

Thanks and regards,

-George

0 Brian Kramer over 10 years ago in reply to George Mock

Prodigy 40 points

C:

#include <stdio.h>

int func(int, int, int);

int main()
{
	int i = 12;
	int j = 13;
	int k = -5;

	int p = func(i,j,k);
	printf("%d\n", p);

	return 0;
}

Assembly:

.data

		.text

		.def _func
_func	.cproc M, Y, Z

		.reg m
		.reg y
		.reg z
		.reg ans

		MV *M,m
		MV *Y,y
		MV *Z,z

		ADD m, y, ans
		ADD ans, z, ans

		.return ans
		.endproc

I've tried many variants but here's one example. Every time the error is similar to the one above.

0 Brian Kramer over 10 years ago in reply to Brian Kramer

Prodigy 40 points

Maybe I was just looking at this too long yesterday. I got rid of the asterisks is lines 13,14,15 in the above example and it worked

0 George Mock over 10 years ago in reply to Brian Kramer

TI__Guru**** 251180 points

Brian Kramer said:
I got rid of the asterisks

That's the correct answer. -George

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Passing Data From C to Assembly