mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 10:19:47 -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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"""Dump write trace entries for a specific address range."""
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import socket, json, sys
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port = int(sys.argv[1]) if len(sys.argv) > 1 else 4370
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filter_lo = int(sys.argv[2], 16) if len(sys.argv) > 2 else 0x79EB0
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filter_hi = int(sys.argv[3], 16) if len(sys.argv) > 3 else 0x79EC0
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def to_int(v):
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if isinstance(v, str):
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return int(v, 16) if v.startswith('0x') else int(v)
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return v
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s = socket.create_connection(('localhost', port), timeout=10)
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s.sendall(b'{"cmd":"wtrace_dump","start":0,"count":200}\n')
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data = b''
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while b'\n' not in data:
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chunk = s.recv(65536)
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if not chunk:
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break
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data += chunk
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s.close()
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resp = json.loads(data.split(b'\n')[0])
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if not resp.get('ok'):
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print(f'Error: {resp}')
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sys.exit(1)
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entries = resp.get('entries', [])
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print(f'Total trace entries: {len(entries)}')
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found = 0
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for e in entries:
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phys = to_int(e.get('addr', 0))
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if filter_lo <= phys < filter_hi:
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found += 1
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func_val = to_int(e.get('func', 0))
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old_val = to_int(e.get('old', 0))
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new_val = to_int(e.get('new', 0))
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ra_val = to_int(e.get('ra', 0))
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w = to_int(e.get('width', 0))
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frame = e.get('frame', '?')
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print(f' addr=0x{phys:08X} old=0x{old_val:08X} new=0x{new_val:08X} '
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f'w={w} func=0x{func_val:08X} ra=0x{ra_val:08X} frame={frame}')
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if found == 0:
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print(f'No writes to range 0x{filter_lo:08X}-0x{filter_hi:08X}')
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print(f'Sample entries:')
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for e in entries[:5]:
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phys = to_int(e.get('addr', 0))
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new_val = to_int(e.get('new', 0))
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func_val = to_int(e.get('func', 0))
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print(f' addr=0x{phys:08X} new=0x{new_val:08X} func=0x{func_val:08X}')
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