CodeWarrior Development Tools中的主题 Access linker symbols in S12Z tool chain (eclipse)

Access linker symbols in S12Z tool chain (eclipse)

alessandromommo — Tue, 25 Nov 2014 09:46:29 GMT

I'm compiling using CW10.6 eclipse plugin. I tried to retreive linker defined symbols referencing to memory segments. I used macros taken from MCU_Build_Tools_Utilities, Revised: June 10, 2014, page 100. They are:

#define __SEG_START_REF(a) __SEG_START_ ## a

#define __SEG_END_REF(a) __SEG_END_ ## a

#define __SEG_SIZE_REF(a) __SEG_SIZE_ ## a

#define __SEG_START_DEF(a) extern char __SEG_START_REF(a) []

#define __SEG_END_DEF(a) extern char __SEG_END_REF( a) []

#define __SEG_SIZE_DEF(a) extern char __SEG_SIZE_REF( a) []

I have defined the symbol SHADOW_ROM_S in prm file covering a memory area from 0xFFEE00 to 0xFFEFFF. In my code I define a variable ptTest and I tried the following assigment

char* const ptTest = __SEG_START_REF(SHADOW_ROM_S);

By the way, before previous assigment i used macro __SEG_START_DEF(SHADOW_ROM_S) to declare a variable __SEG_START_SHADOW_ROM_S.

I expected to have ptTest egual to 0xFFEE00 but i got a pointer to 0 instead.

What should I do to get the correct value?

Thanks,

Alessandro

Re: Access linker symbols in S12Z tool chain (eclipse)

trytohelp — Thu, 27 Nov 2014 09:58:53 GMT

Hi Alessandro,

I don't have a S12Z device so I can not test it.

I've created an example for S12Z and tried it on S12 simulator.

It seems to be running so I think it should work on S12Z too.

I think the problem is may be linked to the initialization of your variable pTest which should be defined as far.

Please have a look to the example attached.

It should work.

Have a great day,
Pascal Irrle

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: Access linker symbols in S12Z tool chain (eclipse)

alessandromommo — Mon, 01 Dec 2014 11:01:32 GMT

Thanks so much for help.

Regards,

Alessandro

2014-11-27 10:59 GMT+01:00 Pascal Irrle <admin@community.freescale.com>:

<https://community.freescale.com/>
Access linker symbols in S12Z tool chain (eclipse)
reply from Pascal Irrle
<https://community.freescale.com/people/trytohelp?et=watches.email.thread>
in CodeWarrior Development Tools - View the full discussion
<https://community.freescale.com/message/457770?et=watches.email.thread#457770>