Example using .csect pseudo-op with td storage-mapping class

The source for the main C prgram td1.c

1. The following is the source for the C main program td1.c:

   
   /* This C module named td1.c   */
   extern long   t_data;
   extern  void mod_s();
   main()
   {
            mod_s();
            printf("t_data is %d\n", t_data);
   }
   

2. The following is the assembler source for module mod1.s:

   
           .file  "mod1.s"
           .csect .mod_s[PR]
           .globl .mod_s[PR]
           .set    RTOC, 2
           l   5, t_data[TD](RTOC)  # Now GPR5 contains the
                                    # t_data value 0x10
           ai  5,5,14
           stu 5, t_data[TD](RTOC)
           br
           .globl  t_data[TD]
           .toc
           .csect  t_data[TD]  # t_data is a global symbol
                               # that has value of 0x10
                               # using TD csect will put this
                               # data into TOC area
           .long    0x10
   

3. The following commands assemble and compile the source programs into an executable td1:

   
   as -o mod1.o mod1.s
   cc -o td1 td1.c mod1.o
   

4. Running td1 prints the following:

   
   t_data is 30