Recompiler — `recompiler/src/function_analysis.cpp` now stops a
function's end_addr at its mapped `jr $ra` + delay slot instead of
stretching through trailing data. Fixes Tomba's 0x80076DB0, a real
136-byte function that was being emitted as a psx_unknown_dispatch
stub because data after it poisoned the boundary heuristic.
`code_generator.cpp` emits `func_<next>(cpu); return;` as a tail
call when a mid-function seed split leaves the physical fall-through
in a different C function, plus a `debug_server_log_call_entry` at
every function entry. `full_function_emitter.cpp` splits dispatch
into `psx_dispatch_impl(cpu, addr, stop_addr)` with public
`psx_dispatch` and new `psx_dispatch_call(cpu, addr, return_addr)`
so JAL/JALR into RAM stubs can return cleanly without growing the
native stack.
Runtime — `runtime/src/dma.c`/`include/dma.h`/`src/memory.c` now
expose `dma_write_masked()`; the 16-bit and 8-bit mmio paths route
DICR/DPCR/CHCR partial writes through it so a partial DICR write no
longer accidentally clears unrelated channels' pending IRQ flags,
and CHCR only triggers DMA when the written mask actually includes
the start bit. Unified `complete_transfer(ch)` across all channels,
removed `prev_master_flag` edge detection.
MDEC (`runtime/src/mdec.c`, `include/mdec.h`) gains a full debug
surface: `MDECDebugState` snapshot, an always-on 4096-entry
`MDECDebugEvent` ring with 11 event kinds (reset, ctrl_write,
cmd_begin/done, decode_done, dma_in/out start/end, output_drained,
read_underflow), and `mdec_state` / `mdec_trace` / `mdec_trace_clear`
debug-server commands. DMA ch0/1 emit start/end events around MDEC
transfers.
CDROM (`runtime/src/cdrom.c`, `include/cdrom.h`) — read stream
separated from one-shot pending state (`read_cmd`, `read_delay`,
`start_read_stream`, `stop_read_stream`, `deliver_read_sector`);
`cdrom_state`/`cdrom_trace` report the new fields.
Thread/fiber tracing — `traps.c`'s Win32-fiber TCB save/restore now
emits 12 thread-event kinds; new `ThreadTraceEntry` ring (64 K) plus
`thread_trace` / `thread_trace_clear` debug-server commands report
both live CPU regs and the target TCB's full saved register block.
wtrace / mmio rings — `WriteTraceEntry` grew (cpu_pc, sp, v0/v1/a0-a3/
t0/t1); capacity 1 M -> 4 M. `MmioTraceEntry` grew (pc, cpu_pc, sp,
a0-a3, sr, epc, i_stat, i_mask). Both dump commands accept
`count`/`newest=1` for reverse iteration. `restore_trace` and
`dirty_block_log` emit extended register fields (a2/a3/sp).
Misc — `interrupts.c` polls debug-server every 16K checks so it
stays responsive without a separate thread. `psx_runtime.h`'s
`call_by_address` routes through `psx_dispatch_call`. Dirty-RAM
interp JAL/JALR consult `psx_dispatch_game_compiled` when the game
is wired in. iso_reader gains the entry points needed by the game
disc path. New `tools/_tomba_probe.py` for port-4470 health checks.
Generated — regenerated `SCPH1001_dispatch.c` against the new
`psx_dispatch_impl` shape.
ISSUES.md — opened Issue #3 (BIOS PS-logo glyph missing on the
disc-detected screen, cosmetic).
.gitignore — added `recompiler/build-asan*/`, `build-checked/`,
`__pycache__/`.
Validated end-to-end: BIOS boots, disc detected, Whoopee Camp FMV
plays with audio. Frame count advances through ~40K frames without
freezes. `unknown_dispatch_log.total = 0`. Remaining FMV cluster
issues (1/4-size render, FMV-2 audio missing, no skip) tracked
under TombaRecomp/ISSUES.md.
Co-Authored-By: Codex (OpenAI) <noreply@openai.com>
timers.c — timers_advance(cycles) replaces per-frame timers_tick().
Per-timer fractional accumulator + proper divisors:
- Timer 0 dotclock approx (cycles/5)
- Timer 1 HBlank clock (cycles/2146, ~263 HBlanks per NTSC frame)
- Timer 2 SYSCLK or SYSCLK/8 per mode register bit 8..9
Target/overflow flags fire IRQ when bit 4/5 of mode is set.
cdrom.c — cdrom_advance(cycles) replaces per-frame cdrom_tick().
Sector pacing from CPU clock: 451584 cycles at 1x, 225792 at 2x
(SetMode bit 7). Whole-sector mode bit 5 prepends a 12-byte BCD-MSF
header to the data buffer; SECTOR_BUFFER_SIZE = 12 + 2048.
cdrom_trace ring: always-on CDROMTraceEntry[1<<16] capturing every
register write, IRQ raise/mask, sector load, and command dispatch
with the current func/PC/frame snapshot. Query via the new
debug_server commands landed in a later commit.
psx_cycles.c — psx_advance_cycles now drives cdrom_advance and
timers_advance in addition to sio_advance.
interrupts.c — legacy per-frame timers_tick + cdrom_tick now gated
behind #ifndef PSX_ENABLE_BLOCK_CYCLES, so block-cycle builds use
the cycle-paced path exclusively.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
CDROM (adapted from v3, 487 lines):
- Removed event_deliver() — HLE disease. IRQ delivery is now purely
via i_stat bit 2; the recompiled BIOS exception handler processes
CDROM events natively through its own EvCB table.
- Removed CPUState* from all function signatures — hardware registers
don't need CPU state.
- Removed hard-coded RAM writes (0x800DEE54 etc.) — BIOS kernel state
manipulation disguised as hardware sim.
- Removed all fprintf.
- Kept: register banking, command processing, sector reads, DMA interface.
SPU (new, 89 lines, register map from v2 reference):
- Accepts all SPU register reads/writes at 0x1F801C00-0x1F801FFF
- 512KB SPU RAM with transfer address tracking and FIFO writes
- DMA4 write interface for bulk transfers
- SPUSTAT returns 0 (ready, not busy)
- No audio synthesis — placeholder for SDL_audio integration later
Memory.c: replaced inline spu_regs[] array and stub CDROM handlers
with calls to the proper cdrom.c and spu.c modules.
Validated: BIOS boots identically (16,859 GP0 writes, 1,149 draws).
No regression from previous commit.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Matthew Stanley