C6678 cmd 问题

Hi Jinming,

                Please check if below info could solve your question:

(The related information can be found in spru186q section 7.13.2 ,  7.13.4 and 7.13.6)

A special symbol, denoted by a dot (.), represents the current value of the section program counter (SPC) during allocation.

An SPC represents the current address within a section of code or data. Initially, the assembler sets each SPC to 0. As the assembler fills a section with code or data, it increments the  appropriate SPC. If you

resume assembling into a section, the assembler remembers the appropriate SPC's previous value and continues incrementing the SPC from that value. 

For example, suppose a program needs to know the address of the beginning of the .text section. By using the .global directive, you can create an external undefined variable called Tstart in the program. Also, you can create variable called Tsize to record the section size.

 Following is the one link command example :

  GROUP

  {

    .text:

    {

      Tstart = .;

    }

     .dummy {Tsize = . - Tstart ;} 

  }

  >   GEM0_TEXT_MEM

The symbols declared in the link CMD files can be accessed in assembly language modules.