Defining __initial_sp, __heap_base and __heap_limit
One of several methods you can use to specify the initial stack pointer and heap bounds is to define the following symbols:
__initial_sp
__heap_base
__heap_limit.
The constants STACK_BASE, HEAP_BASE and HEAP_SIZE can be defined in a header file, for example stack.h, as follows:
/* stack.h */
#define HEAP_BASE 0x20100000 /* Example memory addresses */
#define STACK_BASE 0x20200000
#define HEAP_SIZE ((STACK_BASE-HEAP_BASE)/2)
#define STACK_SIZE ((STACK_BASE-HEAP_BASE)/2)
Note
This method of specifying the initial stack pointer and heap bounds is supported by both the standard C library (standardlib) and the micro C library (microlib).
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