 | | __attribute__ ((rcx_interrrupt)) : how to use ? —Martin Cornelius
| | | | hi there, i´m still not really sure when and why to use __attribute__ ((rcx_interrrupt)) my current assumptions: 1 - it should be used for functions that are called AS interrupt handlers, to make sure registers are pushed onto the stack, and (...) (25 years ago, 31-Jan-00, to lugnet.robotics.rcx.legos)
| | | | | | | | | | Re: __attribute__ ((rcx_interrrupt)) : how to use ? —Ben Jackson
| | | | | (...) Right. The calling conventions of the H8 say that r0-r3 are scratch registers (aka caller saves). However, interrupt handlers must preserve ALL of the registers. So the rcx_interrupt attribute makes that happen. (...) The compiler will only (...) (25 years ago, 31-Jan-00, to lugnet.robotics.rcx.legos)
| | | | | | | | | | | | Re: __attribute__ ((rcx_interrrupt)) : how to use ? —Martin Cornelius
| | | | | (...) Well, i got the definitive answer from Markus 8-). It was in german, so i'll try to translate it: the effect of __attribute__ ((rcx_interrrupt)) depends on the calling context: - in leaf functions (that do not call other functions), it makes (...) (25 years ago, 1-Feb-00, to lugnet.robotics.rcx.legos)
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