RE: Hardfault handler implementation - changing SP in case of stack overflow

Turbo J — Tue, 22 Sep 2020 10:04:06 GMT

Nope. That check in line 68 checks if the SP was bigger than __StackTop, which is equal to end-of-RAM in most cases. That indicates something has completely trashed the SP value altogether, and it is unusable. Hence the jump to "_MoveSP", which just uses __StackTop in order to keep the remaining C code form generating another hard fault (would result in lockup reset).

Also note that this code won't work properly with PSP (e.g. RTOS) setups, as it assumes one single stack between __StackTop and __StackLimit.