psxrecomp

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Commit Graph

Author	SHA1	Message	Date
Matthew Stanley	6e2926c52e	fix: resolve MIPS jump tables with RAM-to-ROM address translation The BIOS shell code (ROM 0xBFC18000+) runs from RAM at 0x80030000+. Jump tables in shell functions store RAM-space target addresses, but at recompile time only the ROM data is available. Three fixes: 1. function_discovery.cpp: detect jump table pattern (SLTIU/SLL/LUI/ ADDU/LW/JR) during function scanning, translate RAM table addresses to ROM, push case targets onto BFS work queue so case body code is included in the function's instruction set. 2. full_function_emitter.cpp: detect same pattern at jr emission time, read table from ROM with RAM-to-ROM mapping, emit C switch/goto instead of cpu->pc=reg;return for resolved tables. 3. code_generator.cpp: add ram_to_rom() helper for the existing jump table detection (used by a different code path). Result: 13 jump tables resolved across the BIOS, +6 functions discovered, +2825 instructions included. Dispatch miss at 0x80058564 (memcard SIO handler) eliminated. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>	2026-04-13 00:40:46 -07:00
Matthew Stanley	7c40d33db3	Phase 1 complete: recompiler proven correct on SCPH1001.BIN Phase 1a (boot slice): 30 instructions at 0xBFC00000, compiles clean. Phase 1b (instruction coverage): 54 opcodes implemented in strict_translator, 44,629 walker-reachable instructions covered, 0 missing. Phase 1c (function discovery): 76 functions from 2 seeds, 2,988 instructions, 199 call edges, 27 indirect jumps. All validated through StrictTranslator. Phase 1d (indirect control flow): 27 sites classified — 21 A0/B0/C0 dispatch stubs, 4 computed calls, 2 computed tail calls. Ghidra cross-referenced with 0 disagreements. Phase 1e (relocation): ROM-to-RAM copy at FUN_bfc00420 proven with both Ghidra (static) and DuckStation (runtime). 69 address aliases, 68/69 function entries match byte-for-byte in RAM. Normalization rule documented. Includes PRINCIPLES.md and DEBUG.md adapted from recomp-template. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>	2026-04-11 21:26:04 -07:00

Author

SHA1

Message

Date

Matthew Stanley

6e2926c52e

fix: resolve MIPS jump tables with RAM-to-ROM address translation

The BIOS shell code (ROM 0xBFC18000+) runs from RAM at 0x80030000+.
Jump tables in shell functions store RAM-space target addresses, but
at recompile time only the ROM data is available.

Three fixes:
1. function_discovery.cpp: detect jump table pattern (SLTIU/SLL/LUI/
   ADDU/LW/JR) during function scanning, translate RAM table addresses
   to ROM, push case targets onto BFS work queue so case body code is
   included in the function's instruction set.
2. full_function_emitter.cpp: detect same pattern at jr emission time,
   read table from ROM with RAM-to-ROM mapping, emit C switch/goto
   instead of cpu->pc=reg;return for resolved tables.
3. code_generator.cpp: add ram_to_rom() helper for the existing jump
   table detection (used by a different code path).

Result: 13 jump tables resolved across the BIOS, +6 functions discovered,
+2825 instructions included. Dispatch miss at 0x80058564 (memcard SIO
handler) eliminated.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-13 00:40:46 -07:00

Matthew Stanley

7c40d33db3

Phase 1 complete: recompiler proven correct on SCPH1001.BIN

Phase 1a (boot slice): 30 instructions at 0xBFC00000, compiles clean.
Phase 1b (instruction coverage): 54 opcodes implemented in strict_translator,
  44,629 walker-reachable instructions covered, 0 missing.
Phase 1c (function discovery): 76 functions from 2 seeds, 2,988 instructions,
  199 call edges, 27 indirect jumps. All validated through StrictTranslator.
Phase 1d (indirect control flow): 27 sites classified — 21 A0/B0/C0 dispatch
  stubs, 4 computed calls, 2 computed tail calls. Ghidra cross-referenced
  with 0 disagreements.
Phase 1e (relocation): ROM-to-RAM copy at FUN_bfc00420 proven with both
  Ghidra (static) and DuckStation (runtime). 69 address aliases, 68/69
  function entries match byte-for-byte in RAM. Normalization rule documented.

Includes PRINCIPLES.md and DEBUG.md adapted from recomp-template.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-11 21:26:04 -07:00

2 Commits