Keil forum Cortex : Saving registers during interrupts

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Cortex : Saving registers during interrupts

VIKTOR BUCHRT over 16 years ago

Hi

Want to know if there is a way to instruct the compiler to preserve more than the normal registers (R0-R3, R12, LR, PSR, and PC) during an interrupt.

Regards
Viktor Bucher

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0 Christoph Franck over 16 years ago in reply to VIKTOR BUCHRT

Those registers must only be preserved during an interrupt call and not when called from the main program.

Then write two versions of the function, one for calling from the ISR and one for calling from the main program. That avoids pesky reentrancy issues, too.
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0 Christoph Franck over 16 years ago in reply to VIKTOR BUCHRT

Those registers must only be preserved during an interrupt call and not when called from the main program.

Then write two versions of the function, one for calling from the ISR and one for calling from the main program. That avoids pesky reentrancy issues, too.
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