I had a look at bug reports https://sourceforge.net/p/sdcc/bugs/2131/ and https://sourceforge.net/p/sdcc/bugs/2339/ and section "3.8.4 Z80 Interrupt Service Routines" in the manual.
According to the manual, we have: 1) non-interruptible isr (can be interrupted by nmi only): void i1(void) __interrupt 2) interruptible isr (can be interrupted by any interupt) void i2(void) __critical __interrupt(0) 3) nmi handler (can be interrupted by nmi only) void i3(void) __critical __interrupt We generate code: 1) save regs ... restore regs reti 2) di save regs ... restore regs ei reti 3) save regs ... restore regs retn Out of these, 3) looks correct to me. But 1) fails to reenable interrupts at the end (I think there should be an ei before the reti). And 2) is completly wrong, I think it should be: ei save regs ... restore regs reti Did I miss something? Philipp (who so far always wrote his interrupt handlers in asm instead of using the SDCC-provided facilities)
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