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Check that aarch64 JIT interpreter functions match generic CPU behavior
Analyze jitc.log to find JIT compilation issues — fragment gaps, branch overflow, bad codegen
Analyze a kernel Oops from the printk buffer in a PearPC memory dump
Based on SOC occupation classification
Showing SKILL.md
| name | check-trace |
| description | Analyze the JIT dispatch trace to diagnose boot stalls or crashes |
| allowed-tools | Bash, Read, Grep |
| argument-hint | ["pattern-or-address"] |
Analyze jitc_trace.log for the pattern or address $ARGUMENTS.
If no argument, check the tail of the trace to diagnose what the CPU is doing.
Check trace tail (last 30 lines):
tail -30 jitc_trace.log
Identify the pattern:
Count exception dispatches:
grep -c 'pa=00000300' jitc_trace.log # DSI count
grep -c 'pa=00000900' jitc_trace.log # DEC count
grep -c 'pa=00000c00' jitc_trace.log # SC count
If argument is a hex address, search for dispatches to/from that address:
grep 'pa=ADDRESS\|ea=ADDRESS' jitc_trace.log | head -20
Check DEC timer status:
grep '\[DEC\]' BOOT_LOG | tail -5
Check WATCH events:
grep '\[WATCH\]' BOOT_LOG | tail -10
DISPATCH ea=EFFECTIVE_ADDR pa=PHYSICAL_ADDR msr=MSR_VALUE
SEQ_NUM pc=PA msr=MSR cr=CR lr=LR ctr=CTR r0=R0 r1=SP r2=R2 r3=R3 r4=R4 r5=R5 dec=DEC
ea = effective (virtual) address the kernel seespa = physical address after translationdec = decrementer register value (should change over time)r1 = stack pointer (0xC01Cxxxx for idle thread, 0xC04Dxxxx for init thread)