S12 / MagniV MicrocontrollersのトピックRe: define objects to segments in PRM file

define objects to segments in PRM file

mikoran — Thu, 31 Jul 2008 11:19:43 GMT

how can we temporarily assigned an object to segments in PRM file so that we could retrieve the starting and end addresses of a segment in PRM using __SEG_START and __SEG_END

tnx

Re: define objects to segments in PRM file

CrasyCat — Mon, 04 Aug 2008 20:11:57 GMT

Hello

It depends on the type of the object you wish to place there.

If it is a variable, variable definition should be done as follows:

#pragma DATA_SEG MyDataSegment

int myVar;

#pragma DATAEG DEFAULT.

You can then retrieve the segment start & end address using __SEG_START_MyDataSegment and __SEG_END_MyDataSegment .

If it is a constant, constant definition should be done as follows:

#pragma CONST_SEG MyConstSegment

conts int myVar= 10;

#pragma CONST_SEG DEFAULT.

You can then retrieve the segment start & end address using __SEG_START_MyConstSegment and __SEG_END_MyConstSegment.

If it is a function, function implementation should be done as follows:

#pragma CODE_SEG MyCodeSegment

void foo(void) {

}

#pragma CODE_SEG DEFAULT.

You can then retrieve the segment start & end address using __SEG_START_MyCodeSegment and __SEG_END_MyCodeSegment.

CrasyCat

Re: define objects to segments in PRM file

mikoran — Wed, 06 Aug 2008 07:07:47 GMT

I tried it but it doesnt work. Still I got zero as the value for start and end address..

Re: define objects to segments in PRM file

CompilerGuru — Wed, 06 Aug 2008 08:42:55 GMT

What's the difference in this issue compared to
http://forums.freescale.com/freescale/board/message?board.id=16BITCOMM&message.id=6209
?

In that issue you did not actually place anything in those sections, and therefore the linker did not allocate it and therefore you got 0. Did you now allocate something?

Anyway, please provide much more details, otherwise I don't think it is possible to help much, we just would guess what your problem is, and we probably guess incorrectly.

Also have a look at the startup code, there the end address of the stack is taken with this method, there it does work. So you can check what you do differently.

Daniel