get function start address and code length

"is there a way to get the start address and code length of a function?"

Most definitely, yes. The linker map file will do.

"I need them in my prog."

This, I am curious about -- why would your prog need that info?

"is there a way to get the start address and code length of a function?"

Most definitely, yes. The linker map file will do.

"I need them in my prog."

This, I am curious about -- why would your prog need that info?

hello Dan,
thanks for your reply. It's needed by my cache algorithm. I think the linker result should not be accessible in source code.

karah

It's needed by my cache algorithm.

... on a '51 ? That must be a curious derivative indeed.

You can get the entry points of functions through function pointers, but that will mean opening a fairly nasty can of worms on a '51.

There is no really pratical way to get the functions end address during run-time.

hi Christoph,
Just as you said,You can get the entry points of functions through function pointers. I have tried in this way, but I can only get the item addresss in calltable.

unsigned char * pCode = Func;
void Func()
{
...
}

we got:
pCode = C:0xecfa

in map file:

INTERBANK CALL TABLE OF MODULE:
ADDRESS    FUNCTION NAME
----------------------
...
C:00ECFA   Func
...

PUBLIC SYMBOLS OF MODULE:
VALUE     CLASS    TYPE    PUBLIC SYMBOL NAME
---------------------------------------------
...
00889CAC  CODE/B8   ---       Func
...

Karah

I have tried in this way, but I can only get the item addresss in calltable.

So you are using code banking ? In that case, the can of worms mentioned just got a whole lot nastier.

You could, of course, rip the functions start address out of the call table. There has to be a call to the appropriate address in there.

The question still is - what are you trying to accomplish ? The '51 architecture does not lend itself too well to doing things like virtual memory. If you are trying to relocate functions to a different address, all non-relative jumps will end up at some meaningless address - instant crash.