ARM VERSION 1.2 Scheda Tecnica Scaricare il pdf (Pagina 164)

100

101

The C and C++ Libraries

4.9.11 __rt_stack_postlongjmp()

This function sets sp and sl to correct values after a call to

longjmp()

. An incomplete

prototype implementation in assembler code is in

rt_memory.s

Implementation

This function is called with r0 containing the pre-

setjmp()

value for sl, and r1

containing the pre-

setjmp()

value for sp.

If your memory model is used only with non stack-checked ATPCS, you do not have to

implement this function.

Returns

The function must set sl and sp to valid post-

longjmp()

values. The registers must be set

atomically to avoid interrupt problems. So in the minimal implementation where the

memory model requires no special handling, you would push r0 and r1 on the stack and

then use

LDM

to load sl and sp atomically with the new values.

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ARM VERSION 1.2 Scheda Tecnica Pagina 164

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