New crate `xenia-jit` — the PPC->x64 block-JIT runtime substrate, behind
default-OFF XENIA_JIT. Phase 0 ports ZERO opcodes to native: every guest
instruction is emitted as `call jit_interpret_one` (the interpreter), so a
JIT-compiled block is byte-identical to step_block by construction. This
proves the ABI/counters/exit-semantics/mem-helpers/code-cache before any
opcode is hand-written.
- JitEnv{ctx, mem (fat raw ptr), last_result}; compiled block =
extern "C" fn(*mut JitEnv)->u32 (StepResult discriminant, 0=Continue).
Emitted code pins ctx in r15 + env in rbx (callee-saved across calls),
offsets via offset_of!.
- Determinism postlude: cycle_count/timebase +=1 after every retired
instruction; block stops at the same instruction as the interpreter
(non-Continue result, or taken-branch pc discontinuity).
- Per-slot JitCache mirrors BlockCache's (start_pc, page_version) gate;
each CompiledBlock OWNS a copy of its decoded instrs so baked instr
pointers can't dangle after a block-cache eviction.
- xenia-cpu: `pub fn interpret_one` (execute without the cycle bump — the
JIT owns counting).
- Seam: run_superblock main.rs:3154 dispatches to the JIT when enabled;
WorkerCtx gains an Option<JitCache> (Some only when XENIA_JIT set and
RET-CAPTURE debug env unset). observe_per_instruction gate unchanged, so
tooling runs never reach the JIT.
Gate: golden n200m BYTE-IDENTICAL both with and without XENIA_JIT=1.
Throughput -n 200M --gpu-inline: 4.5s interp vs 7.1s all-fallback skeleton
(the per-instruction call overhead Phase 1 removes for hot opcodes).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Workspace gains a new xenia-ui member that owns the winit/wgpu
window, the Xenos display pipeline (xenos_pipeline + render +
texture_cache_host), HUD font/blit shaders, and the input-bridge
plumbing the app uses to surface guest framebuffers and overlays.
Workspace dependencies grow accordingly: rusqlite is replaced with
duckdb (analysis pipeline now writes DuckDB stores), and tracing /
metrics / pprof / winit / wgpu / gilrs / pollster / crossbeam /
bytemuck are added at workspace level so xenia-ui and xenia-app
share versions. Cargo.lock regenerated.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Rust reimplementation of the xenia Xbox 360 emulator targeting reverse-
engineering and preservation, initially scoped to Project Sylpheed.
Includes:
- XEX2 loader (LZX decompression, AES decryption, PE parsing)
- XISO / XGD2 disc image VFS
- PPC interpreter with 200+ opcodes and VMX128 decoding
- Static analyzer: functions, cross-references, labels, asm + SQLite output
- HLE kernel covering the xboxkrnl/xam subset used by Sylpheed init
- Debugger with in-memory and SQLite-backed execution tracing
- `xenia-rs` CLI with extract/dis/exec commands that produce cumulative,
superset SQLite databases and opt-in instruction/import/branch traces
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
