===== 05 TAR F27 COP0 R6 JUMPDEST | BIOS 19951204 System ROM Version 3.0 11/18/96 A BadVaddr as the group starts: 00000480 COP0 r6 (JUMPDEST) (row 78). As the group starts: BFC02BAC; I_MASK 0C040009 Interrupts off, cold then warm: before a taken beq BFC02BAC, after it BFC02BAC, after a j BFC02BAC; warm BFC02BAC BFC02BAC BFC02BAC (code at 8010FAC0) Around EnterCriticalSection (a syscall): BFC02BAC then BFC02BAC; after ExitCriticalSection BFC02BAC A 3 word loop at 8010FAC0 (nop, bne at +4, addiu in its slot at +8), interrupts on, 250000 turns (about 750000 cycles) each run: r6, EPC, Cause after it, then r6 again 1000 cycles on: r6 BFC02BAC EPC 8010FAC0 (+0) Cause 00000000; r6 later BFC02BAC r6 8010FAC0 EPC 8010FAC4 (+4) Cause D0000000; r6 later 8010FAC0 r6 8010FAC0 EPC 8010FAC4 (+4) Cause D0000000; r6 later 8010FAC0 r6 8010FAC0 EPC 8010FAC4 (+4) Cause D0000000; r6 later 8010FAC0 r6 8010FAC0 EPC 8010FAC0 (+0) Cause 00000000; r6 later 8010FAC0 r6 8010FAC0 EPC 8010FAC4 (+4) Cause D0000000; r6 later 8010FAC0 r6 8010FAC0 EPC 8010FAC0 (+0) Cause 00000000; r6 later 8010FAC0 r6 8010FAC0 EPC 8010FAC0 (+0) Cause 00000000; r6 later 8010FAC0 r6 8010FAC0 EPC 8010FAC4 (+4) Cause 10000000; r6 later 8010FAC0 r6 8010FAC0 EPC 8010FAC0 (+0) Cause 00000000; r6 later 8010FAC0 r6 8010FAC0 EPC 8010FAC0 (+0) Cause 00000000; r6 later 8010FAC0 r6 8010FAC0 EPC 8010FAC4 (+4) Cause D0000000; r6 later 8010FAC0 Done.