Datasheet

The C and C++ Libraries
4-72 Copyright © 1999-2001 ARM Limited. All rights reserved. ARM DUI 0067D
preserve any other registers. On entry to this function, sp and sl are exactly as they were
on entry to the whole application, so a valid stack can be inherited from the execution
environment if desired. (sl is only required if stack checking is used.)
4.9.9 __rt_stack_overflow()
This function is called if a stack overflow occurs. An incomplete prototype
implementation is in
rt_memory.s
Implementation
This function is called with r12 (ip) equal to the desired new sp, and with sp up to 256
bytes below sl.
If your memory model is used only with the default non stack-checked ATPCS, you do
not have to implement this function.
The stack overflow routines are called at function entry if a stack limit check fails. These
are subject to the usual register-use restrictions on stack overflow routines. In particular,
they cannot use r0-r3 because the arguments are still held there, and they cannot use
registers r4 to r11 in case the routine did not save them.
Returns
The function does not return to lr. It must return by branching to
__rt_stack_overflow_return .