11.2 Locating Objects at a Specific Address

In this example, the C language array buf1 is located at a specific address in data memory. The address of buf1 can be confirmed by executing the program in the simulator, or by examining the link map.

#include <stdio.h>
int __attribute__((address(0xa0000200))) buf1[128];

The equivalent array definition in assembly language appears below. The .align directive is optional and represents the default alignment in data memory. Use of * as a section name causes the assembler to generate a unique name based on the source file name.

.globl	buf1
            .section	*,address(0xa0000200),bss
            .align	  2
            .type	   buf1, @object
            .size	   buf1, 512
buf1:
            .space	  512