mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Matthew Stanley
5b3c7dd08d
Today's session work
- runtime/src/debug_server.c: freeze_check TCP cmd snapshots all liveness
counters (PC, exception entries, exception_reentry_blocks, dirty_ram
blocks/insns, fn_entry total + top-K histogram, SIO IRQ pending +
countdown, sio_stat/i_stat/i_mask, mc_max_state) for tight-loop
diagnosis when the runtime hangs
- runtime/src/debug_server.c: wtrace slot 12 covering [0x72F0..0x72F4]
(data-byte counter); measured peak=1 confirming setup_data_phase resets
the counter mid-cycle
- runtime/src/interrupts.c: exception_entries_total + exception_reentry_blocks
counters + psx_get_freeze_diag accessor
- runtime/src/sio.c: sio_get_freeze_diag accessor for IRQ pacing internals
- memory entries: phase4_card_gate_setup_writes_2026_04_28 (refutes the
prior \"missing [0x7568+slot] clearer\" framing — setup functions write
LSB=0 directly), phase4_72f0_one_byte_per_vblank_2026_04_28 (peak=1
measurement)
Overnight session work bundled in
- runtime/src/dirty_ram_interp.{c,h}: small MIPS interpreter for
install-at-runtime kernel RAM stubs (Rule 18; e.g., SIO data-byte
handler the BIOS writes to RAM 0xCF0)
- recompiler/src/full_function_emitter.{cpp,h}: 3057 jal/jalr continuation
return labels added to dispatch table (continuation fix); branch
fall-through fix for conditional-branch delay slots
- recompiler/src/strict_translator.cpp: matching translator updates
- generated/: regenerated SCPH1001 dispatch + full C output reflecting
the recompiler changes
- runtime/include/debug_server.h, src/memory.c: card_txn ring + SIO IRQ
ring + EvCB walk ring + per-PC dirty_ram counters + always-on wtrace
coverage for [0x755A], [0x7514], [0x7528], [0x7520], [0x74A4],
[0x75C0..C8], [0x74B8..C0]
- recompiler/tests/, runtime/tests/: SIO/card protocol unit tests
- tools/: 60+ Python diagnostic scripts (chain_trace analysis, SIO trace
diff, EvCB walker, wtrace dumpers, etc.)
- docs/: psx_bios_disasm reference + dynamic_handler_install rationale
- OVERNIGHT_2026_04_28.md, SUMMARY_20260412_2.md: session logs
Phase 4 status (still blocked, root cause better understood)
- BIOS card chain runs through R-handlers correctly (chain_trace shows
R1..R11 cycling 26x); shell IS retriggering _card_read
- Install handler at ROM 0xBFC15F1C increments [0x72F0] correctly per
SIO IRQ; gate at <0x80 / <0x7F is correct
- Bottleneck: SIO IRQ countdown is access-paced, fires ~1× per VBlank
vs ~128× needed; setup_data_phase (called from outer coord on VBlank)
zeroes [0x72F0] before counter reaches 128
- Both attempted fixes today caused freezes:
* VBlank deferral on [0x75C0]==1 — pending VBlank already in i_stat
delivered anyway; tighter dispatch gate also locked up
* Cycle-paced sio_tick at rates 50, 200 (and gated on [0x75C0]==1) —
runtime freezes once data phase activates, root cause unidentified
- delay=5 narrows the threshold (peak=2 vs peak=1, no freeze) but
doesn't get to 0x80
- Real fix likely requires deeper instrumentation of the freeze (call
stack / dispatch state at the moment of TCP starvation)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
53 lines
1.7 KiB
Python
53 lines
1.7 KiB
Python
#!/usr/bin/env python3
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"""Search PSX runtime RAM for a 4-byte value via TCP debug server."""
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import subprocess
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import json
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import sys
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NC = '/c/Program Files (x86)/Nmap/ncat'
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TARGET = '9c600000' # 0x0000609C in little-endian hex
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RANGES = [
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(0x0000, 0x8000), # kernel
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(0x30000, 0x90000), # shell data
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]
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found = []
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for (start, end) in RANGES:
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print(f"Scanning 0x{start:05X}-0x{end:05X}...")
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for base in range(start, end, 0x1000):
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addr_hex = format(base, 'x')
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cmd = f"""(printf '{{"cmd":"read_ram","addr":"{addr_hex}","len":4096}}\\n'; sleep 0.5) | "{NC}" localhost 4370"""
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try:
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proc = subprocess.run(
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['bash', '-c', cmd],
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capture_output=True, text=True, timeout=10
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)
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d = json.loads(proc.stdout.strip())
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hexdata = d.get('hex', '').lower()
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pos = 0
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while True:
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idx = hexdata.find(TARGET, pos)
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if idx == -1:
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break
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# Check alignment: idx must be even (byte-aligned)
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if idx % 2 != 0:
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pos = idx + 1
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continue
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byte_offset = idx // 2
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ram_addr = base + byte_offset
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found.append(ram_addr)
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print(f" FOUND at 0x{ram_addr:08X} (chunk 0x{base:05X}, byte offset 0x{byte_offset:03X})")
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pos = idx + len(TARGET)
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except Exception as e:
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print(f" Error at 0x{base:05X}: {e}", file=sys.stderr)
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print()
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if found:
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print(f"=== {len(found)} match(es) found ===")
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for addr in found:
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print(f" 0x{addr:08X}")
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else:
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print("=== No matches found ===")
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