5.10.3. Writing your own memory model
If the provided memory models do not meet your requirements,
you can write your own. A memory model must define the functions
described in Table 5.14.
All functions are ARM state functions. The library takes care of
entry from Thumb state if this is required. An incomplete prototype
implementation for the model is provided in rt_memory.s located
in the ...\include directory.
Use the prototype as a starting point for your own implementation.
Table 5.14. Memory model functions
| Function | Description |
|---|
__rt_stackheap_init() | Sets the application stack and initial heap.
See __rt_stackheap_init(). |
__rt_heap_extend() | Returns a new block of memory to add to the
heap. See __rt_heap_extend(). |
__rt_stack_postlongjmp() | Atomically sets the stack pointer and stack
limit pointer to their correct values after a call to longjmp(). See __rt_stack_postlongjmp(). |
__rt_stack_overflow() | Handles stack overflows. (This is only required
to be implemented for stack-checked variants.) See __rt_stack_overflow(). |
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