Classic/Legacy CodeWarriorのトピックRe: How to get a CPU register value in a c file?

How to get a CPU register value in a c file?

admin — Mon, 28 Aug 2006 08:39:25 GMT

Hello,

I want to get the SP and IX value in a c file, how to do it?

Thanks.

Re: How to get a CPU register value in a c file?

CrasyCat — Mon, 28 Aug 2006 17:09:48 GMT

Hello

You have to use inline assembly to retrieve value from a register in a C variable.

The assembler instructions then depends on the CPU you are targeting.

CrasyCat

Re: How to get a CPU register value in a c file?

Lundin — Mon, 28 Aug 2006 17:24:12 GMT

Well, it shouldn't be impossible to get the SP through ANSI C:

unsigned char* stackPtr;

{
volatile unsigned char foo;
stackPtr = &foo + sizeof(foo);
}

But I would still recommend inline asm in this case. And to get index registers etc, you must use it.

Re: How to get a CPU register value in a c file?

marvin — Wed, 30 Aug 2006 13:33:33 GMT

Lower 16-bits of the SP you can get by the following code.

volatile unsigned int StackPtr;

asm(move.w SP,StackPtr);