User guide

Note

The names __ARM_stack_overflow and __Thumb_stack_overflow are illustrative and do not correspond to

any actual implementation.

Routine using more than 256 bytes of stack

In this case, a new value of sp must be proposed to the limit-checking code using a sequence such as the following:

SUB ip, sp, #size ; ARM code version

CMP ip, sl

BLLO __ARM_stack_overflow

or in Thumb code:

LDR r7, #-size ; Thumb code version

ADD r7, sp

CMP r7, sl

BLLO __Thumb_stack_overflow

This is necessary to ensure that sp cannot become less than the lowest usable address in the stack.

Note

The names __ARM_stack_overflow and __Thumb_stack_overflow are illustrative and do not correspond to

any actual implementation.

Using the Procedure Call Standard