Mark, I have tried this before and this doesn't work. Execution flow never arrives to "2:".
All the other values are extra info I have collected. But problem was isolated using breakpoints to avoid stepping influence. Best regards, Alex Citando Mark Chambers <markc at mail.com>: > RFI = Return From Interrupt. In normal usage the current > address is copied into SRR0 when an exception occurs so > the processor will return to that point with an RFI. So this > code is 'faking out' the RFI instruction to return to 2: > > Are you maybe trying to trace through this code? If so, > and depending on your debugger, you may not be able to. > If your debugger uses trace or some other exception to do > single step, once you get past mtspr SRR0,r4 the single > step exception will overwrite the correct SRR0. You > can see if this is the case by only tracing to mtspr SRR0,r4 > and then putting a breakpoint at 2: > > Good luck, > Mark Chambers >
