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Save/Restore the necessary registers for an ISR

Question asked by andy tsybezoff on Feb 2, 2017
Latest reply on Feb 3, 2017 by alexander.yakovlev

Hi to all!
I try to port free RTOS to P1010. I have some questions about macroses isr_prologue/isr_epilogue in eppc_exception.asm. As i know these marcoses save/restore task current contexts. Size of context is 320 bytes. 20 registers saved by macroses. Please, tell me someone about r0, r3-r12!!! this is GRPs??? why i should save its??? what kind of data does it store??? where are r1 and r2 in these macroses???