mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 18:25:35 -04:00
Matthew Stanley
b3833aa253
Root cause: the recompiler split the kernel exception handler at the jalr $s1 (chain handler dispatch) into func_00000C80 and func_00000E10. The chain-walker continuation at BFC10910 never executed — only the first handler in chain 0 was ever called. I_STAT bits 0 (VBlank) and 2 (CDROM) were never acknowledged, causing an interrupt livelock. Fixes: - Emitter jalr/jal safety-net: when the return address falls outside the current function, emit a continuation psx_dispatch call after the jalr dispatch. This bridges split functions at indirect calls. - Merged exception handler: removed BFC10910 seed so the chain walker continuation is part of func_00000C80 (C fall-through after jalr). - 0xBFC10910 dispatch special case in psx_unknown_dispatch: chain handlers return to $ra=BFC10910 via jr $ra (compiled as `return;`); the dispatch loop picks up the $ra value — handled as a no-op since the continuation already ran via C fall-through. - Post-exception adaptive cooldown: if the handler didn't clear any I_STAT bits, give main code 500 blocks before re-firing. Prevents VBlank livelock when no handler claims the interrupt. - SIO byte write handler in mmio_write8 (was missing, caused crash). - GPU→RAM DMA ch2 stub: fills target with zeros, completes transfer. - Dispatch trace (debug_server_trace_dispatch) added to emitter template so it survives regeneration. Result: shell device detection completes, StartPad dispatched, chain E014 populated, GPU actively rendering the Memory Card / CD-ROM screen. VSync counter still 0 (handler installed but not yet incrementing — next investigation). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
144 lines
4.1 KiB
C
144 lines
4.1 KiB
C
/*
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* debug_server.h -- TCP debug server for PSX recomp v4
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*
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* Non-blocking TCP server on localhost (default port 4370).
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* JSON-over-newline protocol, polled once per vblank.
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* Includes a 36000-frame ring buffer for retroactive state queries.
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*
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* Same public API names as nesrecomp/snesrecomp debug servers
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* so TCP.md and DEBUG.md documentation is reusable across projects.
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*/
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#ifndef PSXRECOMP_V4_DEBUG_SERVER_H
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#define PSXRECOMP_V4_DEBUG_SERVER_H
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#include <stdint.h>
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#include "cpu_state.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* ---- Ring buffer frame record ---- */
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#define FRAME_HISTORY_CAP 36000 /* ~10 min @ 60fps */
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#define MAX_FRAME_DIFFS 32
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#define RAM_SNAPSHOT_REGIONS 4
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#define RAM_SNAPSHOT_SIZE 128
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typedef struct {
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uint16_t addr;
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uint8_t mine;
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uint8_t theirs;
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} FrameDiffEntry;
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typedef struct {
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uint32_t frame_number;
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int verify_pass; /* 1=pass, 0=fail, -1=not checked */
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int diff_count;
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/* ---- MIPS CPU state ---- */
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uint32_t gpr[32];
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uint32_t hi, lo;
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uint32_t cop0_sr;
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uint32_t cop0_cause;
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uint32_t cop0_epc;
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/* ---- Interrupt state ---- */
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uint32_t i_stat;
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uint32_t i_mask;
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/* ---- GPU display state ---- */
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uint16_t display_area_x, display_area_y;
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uint16_t display_w, display_h;
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uint8_t display_disabled;
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/* ---- SIO state ---- */
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uint16_t pad_buttons;
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uint16_t sio_stat;
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uint16_t sio_ctrl;
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/* ---- Timing ---- */
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uint32_t dispatch_count;
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uint64_t total_dispatches;
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/* ---- Game-specific (filled by hook) ---- */
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uint8_t game_data[32];
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/* ---- Last function name ---- */
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char last_func[32];
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/* ---- Configurable RAM snapshot regions ---- */
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uint32_t snapshot_addr[RAM_SNAPSHOT_REGIONS];
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uint8_t snapshot_data[RAM_SNAPSHOT_REGIONS][RAM_SNAPSHOT_SIZE];
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/* ---- Divergence diffs (verify mode) ---- */
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FrameDiffEntry diffs[MAX_FRAME_DIFFS];
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} PSXFrameRecord;
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/* ---- Public API (same names as NES version) ---- */
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/* Initialize the server. Call once at startup.
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* port=0 uses the default (4370). */
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void debug_server_init(int port);
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/* Poll for incoming connections and commands. Non-blocking.
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* Call once per vblank. */
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void debug_server_poll(void);
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/* Record the current frame's state into the ring buffer.
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* Call after vblank processing. */
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void debug_server_record_frame(void);
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/* Block while paused, polling TCP + SDL events.
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* Call from vblank callback before frame processing. */
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void debug_server_wait_if_paused(void);
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/* Graceful shutdown. Call at exit. */
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void debug_server_shutdown(void);
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/* Check if a TCP client is connected. */
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int debug_server_is_connected(void);
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/* ---- Tier 1 reverse debugger: write trace ---- */
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/* Current dispatch target — set by psx_dispatch() before each call.
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* Captured by the write-trace hook for function attribution. */
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extern uint32_t g_debug_current_func_addr;
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/* Multi-range write-trace check. Called from memory.c write paths.
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* Iterates up to 8 configurable address ranges; records matching
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* writes into the 1M-entry ring buffer with function + frame attribution. */
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void debug_server_trace_write_check(uint32_t phys, uint32_t old_val,
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uint32_t new_val, uint8_t width);
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/* MMIO write trace — separate ring buffer for 0x1F801xxx writes. */
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void debug_server_trace_mmio_write(uint32_t addr, uint32_t val, uint8_t width);
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/* Dispatch trace — record every function dispatched. */
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void debug_server_trace_dispatch(uint32_t func_addr);
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/* ---- Watchpoint notifications ---- */
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void debug_server_check_watchpoints(void);
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/* ---- Input override ---- */
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/* Returns >= 0 if the debug server wants to override pad input,
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* -1 if no override is active. Value is PS1 16-bit button mask. */
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int debug_server_get_input_override(void);
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/* ---- Send helpers (for extensions) ---- */
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/* Set the CPU state pointer for register queries. Call after CPU init. */
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void debug_server_set_cpu(CPUState *cpu);
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void debug_server_send_line(const char *json);
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void debug_server_send_fmt(const char *fmt, ...);
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#ifdef __cplusplus
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}
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#endif
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#endif /* PSXRECOMP_V4_DEBUG_SERVER_H */
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