Exception causing insns in delay slots

Fri Apr 26 04:15:00 GMT 2002

 From: Jason Merrill <jason@redhat.com>
 Date: 2002年4月26日 11:43:39 +0100
 context->ra - 1 isn't supposed to be the previous instruction; it's
 supposed to point somewhere inside the throwing instruction.

Aha, that makes sense.
 > Basically, for signal frame dwarf2 unwind to work in the current
 > framework the signal handler advances the program counter past
 > the exception causing instruction and that value minus one has to
 > be within the exception causing instruction.

 Sounds right to me. What's the problem?

No problem, just didn't understand how it was supposed
to work I guess.
 The dwarf2 unwind information does not know about delay slots; it assumes
 that code is executed linearly, so it's important that the shuffling of
 instructions for delay slot scheduling doesn't affect register save
 information. Other than that, it should be fine.

Ok, this seems to doubly confirm the need for my reorg fix.