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>
47 lines
1.2 KiB
Python
47 lines
1.2 KiB
Python
#!/usr/bin/env python3
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"""Read a small VRAM tile and report non-zero pixel count."""
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import socket, json, sys
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from PIL import Image
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port = int(sys.argv[1]) if len(sys.argv) > 1 else 4371
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x, y = 0, 0
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w, h = 128, 128
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s = socket.create_connection(('localhost', port), timeout=5)
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cmd = f'{{"cmd":"read_vram","x":{x},"y":{y},"w":{w},"h":{h}}}\n'
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s.sendall(cmd.encode())
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data = b''
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while True:
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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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if b'\n' in data:
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break
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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('Error:', resp)
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sys.exit(1)
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pixels = bytes.fromhex(resp['pixels'])
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rw, rh = resp['w'], resp['h']
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nz = sum(1 for i in range(0, len(pixels), 2) if pixels[i] | pixels[i+1])
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print(f'Tile {rw}x{rh}, {len(pixels)} bytes, {nz} non-black pixels out of {rw*rh}')
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# Save as image
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img = Image.new('RGB', (rw, rh))
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for py in range(rh):
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for px in range(rw):
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off = (py * rw + px) * 2
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if off + 1 >= len(pixels):
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break
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val = pixels[off] | (pixels[off + 1] << 8)
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r = (val & 0x1F) << 3
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g = ((val >> 5) & 0x1F) << 3
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b = ((val >> 10) & 0x1F) << 3
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img.putpixel((px, py), (r, g, b))
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img.save('ds_tile.png')
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print('Saved ds_tile.png')
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