User guide

By default, the stack pointer sp is initialized to 0x08000000 for ARMulator. If you are using a development board,

you must set $top_of_memory. For example, for most (unexpanded) ARM Integrator boards, set

$top_of_memory to 0x40000.

6.4.2 Sample code

The C code fragment in Example 6-1 shows the use of semihosting SWIs to output text. See the main.c source

code for the definitions of demo_malloc(), demo_printf(), demo_float_print(), and demo_sprintf().

The code selected by the #ifdef EMBEDDED is used in Loading the ROM image at address 0 and other examples.

Example 6-1 extract from main.c

int main(void)

{

printf("C Library Example\n");

#ifdef EMBEDDED

/* ensure no C library functions that uses semihosting SWIs are linked */

#pragma import(__use_no_semihosting_swi)

#endif

demo_printf();

demo_sprintf();

demo_float_print();

demo_malloc();

return 0;

}

Writing Code for ROM