How to get section address and size

The linker will define symbols; for gcc-arm-none-eabi at least, they look like:  __bss_start__, __bss_end__, __data_start__, and __data_end__

In C, use their addresses:

extern uint8_t  __bss_start__, __bss_end__, __data_start__,  __data_end__;

  printf("BSS Start = %08x, size = %d\n", &__bss_start__, &__bss_end__ - &__bss_start__);

(I believe Keil does the same thing)

The linker will define symbols; for gcc-arm-none-eabi at least, they look like:  __bss_start__, __bss_end__, __data_start__, and __data_end__

In C, use their addresses:

extern uint8_t  __bss_start__, __bss_end__, __data_start__,  __data_end__;

  printf("BSS Start = %08x, size = %d\n", &__bss_start__, &__bss_end__ - &__bss_start__);

(I believe Keil does the same thing)

Thanks, but I don't the symbol rule in Keil, a document said use 'Section$$Base/Limit', I tried but not correct.

Are you sure?
https://www.keil.com/support/man/docs/armclang_ref/armclang_ref_pge1362066045758.htm

(Hmm.  Different number of underlines for the data section?)
I tried using an old UV4. and it did NOT work :-(  I could not find a linker option that specifically enables this.
Nor could I find any likely looking symbols in the .map file :-(

Yes, I search lots of websites, can't find the answer. But I think it should be a very common requirement.

Are you using the Free version of the compiler ("MDK-Lite")?  There is this somewhat worrying statement in the "restrictions" document that might explain why we can't get it working:

The assembler and linker create Symbolic Output Format objects which cannot be linked with third-party linker utilities. Fully licensed tools generate standard ELF/DWARF files which may be used with third-party utilities.

Hi Bill

Thanks for your reply.

My Version is: MDK-ARM Professional Version 5.21a, is it MDK-Lite ?

And what is you said third-party utilities ?

And which format is used for constdata section start address ? constdata$$Base or __constdata_start?