re: ISL bytecode encoding decoded; phase-end call sites located in Stage02
Read the encoding off the interpreter rather than guessing: instruction is a big-endian u32 whose LOW byte is the opcode (25 of them, table 0x822635FC), byte[2] is the instruction length -- every handler advances the pc by it -- and bytes[0..1] are operand kinds. Op 12 is a jump whose operand is relative to the code base [phase+232], which settles that offsets are code-base-relative for this opcode. Op 19 is the built-in call: id in word@+4, and word@+8 is a monotonically increasing STATEMENT id (0x245, 0x248, 0x24A, ...). Confirmed by disassembling Stage02.ssb: the stream decodes cleanly from the code base and routines terminate on ret exactly where expected. Scanning the code region on the call encoding: 2846 call sites, 73 of the 147 built-ins used. The phase-control ones are located -- built-in 6 (end phase) at 12 sites, 62 at 3, 39 (mark last phase) at 8 -- so a phase has several exit paths, as a mission with win and lose branches should. New tool tools/re-capture/isl.py with --calls and --to (resync-into-target, needed because instructions are variable-length so you cannot walk backwards). Not settled: the 147 built-ins are uncharacterised, so this is structure without meaning -- we can see THAT a phase ends, not WHAT was tested.
This commit is contained in:
Sylpheed RE agent
130
docs/re/data/isl-stage02.txt
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130
docs/re/data/isl-stage02.txt
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# Stage02.ssb — ISL built-in call sites
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2846 call sites, 73 distinct built-ins
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builtin 11 372 site(s)
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builtin 69 255 site(s)
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builtin 1 216 site(s)
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builtin 64 213 site(s)
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builtin 30 179 site(s)
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builtin 20 167 site(s)
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builtin 47 137 site(s)
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builtin 15 127 site(s)
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builtin 108 117 site(s)
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builtin 18 92 site(s)
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builtin 12 86 site(s)
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builtin 5 83 site(s)
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builtin 70 71 site(s)
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builtin 92 63 site(s)
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builtin 56 52 site(s)
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builtin 103 39 site(s)
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builtin 105 38 site(s)
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builtin 4 34 site(s)
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builtin 26 33 site(s)
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builtin 91 27 site(s)
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builtin 80 25 site(s)
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builtin 58 24 site(s)
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builtin 79 23 site(s)
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builtin 63 21 site(s)
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builtin 3 20 site(s)
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builtin 116 18 site(s)
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builtin 19 18 site(s)
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builtin 29 17 site(s)
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builtin 118 15 site(s)
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builtin 124 15 site(s)
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builtin 120 14 site(s)
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builtin 8 12 site(s)
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builtin 101 12 site(s)
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builtin 100 12 site(s)
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builtin 93 12 site(s)
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builtin 59 12 site(s)
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builtin 85 12 site(s)
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builtin 6 12 site(s)
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builtin 9 12 site(s)
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builtin 95 9 site(s)
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builtin 115 9 site(s)
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builtin 7 9 site(s)
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builtin 57 9 site(s)
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builtin 48 8 site(s)
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builtin 39 8 site(s)
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builtin 82 8 site(s)
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builtin 90 8 site(s)
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builtin 17 6 site(s)
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builtin 35 6 site(s)
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builtin 10 6 site(s)
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builtin 123 5 site(s)
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builtin 40 4 site(s)
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builtin 137 3 site(s)
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builtin 75 3 site(s)
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builtin 52 3 site(s)
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builtin 38 3 site(s)
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builtin 106 3 site(s)
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builtin 76 3 site(s)
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builtin 14 3 site(s)
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builtin 119 3 site(s)
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builtin 62 3 site(s)
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builtin 81 2 site(s)
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builtin 25 2 site(s)
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builtin 135 2 site(s)
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builtin 78 2 site(s)
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builtin 83 2 site(s)
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builtin 77 1 site(s)
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builtin 127 1 site(s)
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builtin 130 1 site(s)
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builtin 89 1 site(s)
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builtin 117 1 site(s)
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builtin 99 1 site(s)
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builtin 28 1 site(s)
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## the phase-control built-ins, by site
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builtin 6 END PHASE 12 site(s): 0x51e4 0x5828 0x6010 0x6260 0x19640 0x19934 0x1ac44 0x2b96c 0x2bfb0 0x2c1e0 0x2cf74 0x2d1dc
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builtin 62 force-end 3 site(s): 0x1482c 0x249f0 0x34a10
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builtin 39 mark LAST phase 8 site(s): 0x4dfc 0x52c8 0x60fc 0x19258 0x19724 0x2b584 0x2ba50 0x2c054
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builtin 40 result=1 4 site(s): 0x5a10 0x1a270 0x2c578 0x2d06c
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## disassembly into the first END PHASE
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resync from 0x5058
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005058: 0000080C jmp len=8 k=00,00 0000507C -> code+0x507C (file 0x50A0)
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005060: 01020C00 set.i len=12 k=01,02 00000000 00000042
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00506C: 02030C00 set.i len=12 k=02,03 00000000 00000000
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005078: 01020C00 set.i len=12 k=01,02 00000000 00000002
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005084: 02030C00 set.i len=12 k=02,03 00000004 00000000
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005090: 01020C00 set.i len=12 k=01,02 00000000 00000001
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00509C: 02030C00 set.i len=12 k=02,03 00000008 00000000
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0050A8: 01020C00 set.i len=12 k=01,02 00000000 00000009
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0050B4: 02030C00 set.i len=12 k=02,03 0000000C 00000000
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0050C0: 01020C00 set.i len=12 k=01,02 00000000 00000001
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0050CC: 02030C00 set.i len=12 k=02,03 00000010 00000000
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0050D8: 01021001 set.f len=16 k=01,02 00000000 BFF00000 00000000
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0050E8: 02030C01 set.f len=12 k=02,03 00000018 00000000
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0050F4: 00000C13 call len=12 k=00,00 00000040 00000245 builtin=64
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005100: 0000080C jmp len=8 k=00,00 0000507C -> code+0x507C (file 0x50A0)
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005108: 0000080C jmp len=8 k=00,00 0000507C -> code+0x507C (file 0x50A0)
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005110: 01020C0A op10 len=12 k=01,02 00000000 00000000
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00511C: 0000080D op13 len=8 k=00,00 00004D84
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005124: 01020C0A op10 len=12 k=01,02 00000000 00000001
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005130: 0000080D op13 len=8 k=00,00 00004E2C
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005138: 01020C0A op10 len=12 k=01,02 00000000 00000002
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005144: 0000080D op13 len=8 k=00,00 00004ED4
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00514C: 01020C0A op10 len=12 k=01,02 00000000 00000003
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005158: 0000080D op13 len=8 k=00,00 00004F7C
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005160: 00000C13 call len=12 k=00,00 00000078 00000248 builtin=120
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00516C: 01021001 set.f len=16 k=01,02 00000000 40080000 00000000
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00517C: 02030C01 set.f len=12 k=02,03 00000000 00000000
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005188: 00000C13 call len=12 k=00,00 0000003B 0000024A builtin=59
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005194: 01021001 set.f len=16 k=01,02 00000000 40080000 00000000
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0051A4: 02030C01 set.f len=12 k=02,03 00000000 00000000
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0051B0: 00000C13 call len=12 k=00,00 00000055 0000024B builtin=85
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0051BC: 01021001 set.f len=16 k=01,02 00000000 40080000 00000000
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0051CC: 02030C01 set.f len=12 k=02,03 00000000 00000000
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0051D8: 00000C13 call len=12 k=00,00 00000004 0000024C builtin=4
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0051E4: 00000C13 call len=12 k=00,00 00000006 0000024D builtin=6
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0051F0: 00000C13 call len=12 k=00,00 0000000B 0000024E builtin=11
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0051FC: 01030C00 set.i len=12 k=01,03 00000000 00000001
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005208: 01030C00 set.i len=12 k=01,03 00000004 00000056
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005214: 01021001 set.f len=16 k=01,02 00000000 00000000 00000000
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005224: 02030C01 set.f len=12 k=02,03 00000008 00000000
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005230: 00000C13 call len=12 k=00,00 00000014 00000252 builtin=20
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00523C: 01020C0A op10 len=12 k=01,02 00000000 00000001
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005248: 0000080E op14 len=8 k=00,00 0000575C
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005250: 01020C00 set.i len=12 k=01,02 00000000 00000000
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00525C: 02030C00 set.i len=12 k=02,03 00000000 00000000
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111
docs/re/structures/isl-bytecode.md
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111
docs/re/structures/isl-bytecode.md
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# The ISL script bytecode — instruction encoding decoded
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Status: ✅ the encoding, the 25-opcode table and the call form, read off the
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interpreter and confirmed by disassembling `Stage02.ssb`; 🟡 most opcode
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*semantics* are named only by their handler; ❔ the 147 built-ins are not yet
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characterised.
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Follows [mission-script-ssb](mission-script-ssb.md) (where the scripts live) and
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[mission-phase-advance](../mission-phase-advance.md) (why they matter).
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Tool: `tools/re-capture/isl.py`.
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## ✅ Encoding
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`ScriptPhase::Update` (`sub_82263408`) fetches one **big-endian u32** per
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instruction:
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```
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0x822635D4 lwz r11,0(r31) ; the instruction word
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0x822635D8 clrlwi r4,r11,24 ; OPCODE = the LOW byte
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0x822635DC cmplwi 0x18 ; 25 opcodes
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0x822635FC jump table, 25 absolute VAs
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```
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Every handler advances the pc with `lbz r11,2(r31); add r31,r11,r31`, so:
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| byte | 0 | 1 | 2 | 3 |
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|---|---|---|---|---|
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| meaning | operand kind A | operand kind B | **instruction length in bytes** | **opcode** |
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Operand words follow. The common form is 12 bytes (opcode word + two operands).
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Operand kinds go through resolvers with their own 4-entry table
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(`sub_82271D40` for integers, `cmplwi 0x3`), so there are **4 operand kinds**.
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## ✅ The opcode table
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| op | handler | what the handler does |
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|---|---|---|
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| 0 | `82263660` | integer assign — resolve rvalue (`82271D40`, kind byte[0], word@+8), resolve lvalue (`82272030`, kind byte[1], word@+4), `stw` |
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| 1 | `8226369C` | float assign — same shape with `82271F10`/`82272120` and `stfd` |
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| 2,4,6,8 | `822636D0` | → `822713E8` (a compare/branch family; four opcodes share one handler) |
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| 3,5,7,9 | `822636E4` | → `822714D0` (the sibling family) |
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| 10 | `822636F8` | → `82271598` |
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| 11 | `8226370C` | → `822716E0` |
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| **12** | `82263720` | **JUMP** — `r31 = [phase+232] + word@+4` |
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| 13–18 | `82263738`… | → `82271830`, `822718C8`, `82271960`, `822719F8`, `82271AC8`, `82271B60` |
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| **19** | `822637B0` | **CALL BUILT-IN** → `sub_82272220` |
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| 20 | `82263874` | `li r29,1` then the suspend path — **yield / return** |
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| 21 | `822637C4` | `sub_82175C20(phase+44, phase+168)` |
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| 22 | `822637E4` | `sub_82274BA0(phase+64, phase+184)` |
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| 23,24 | `82263804`… | → `82271C30`, `82271CB8` |
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Handler return codes drive the outer loop at `0x82263828`: **0** continue,
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**1** suspend, **2**/**3** other exits.
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### ✅ Jump operands are code-base-relative
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Op 12 adds its operand to `[phase+232]`, the code base — i.e. the `.ssb`
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header's code offset (`0x24` in every file). That settles, for this opcode, the
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question `mission-script-ssb.md` left open about whether offsets are file- or
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code-base-relative.
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### ✅ The call form, and a statement counter
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`sub_82272220` reads the **built-in id from word@+4** (`cmplwi 0x92` → 147
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built-ins, table `0x8227226C`) and stores **word@+8** into `[phase+200]`.
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That second word turns out to be a **monotonically increasing statement id** —
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`0x245, 0x248, 0x24A, 0x24B, 0x24C, 0x24D, 0x24E, 0x252…` along a routine. It is
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a source-position counter, presumably for the script's own error traces.
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## ✅ It decodes — Stage 02
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Disassembling from the code base runs cleanly, and routines terminate on `ret`
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(op 20) exactly where expected. Data in `data/isl-stage02.txt`.
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Scanning the whole code region for the call encoding:
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```
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2846 call sites, 73 distinct built-ins used (of 147)
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most used: 11 (×372), 69 (×255), 1 (×216), 64 (×213), 30 (×179), 20 (×167)
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```
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**The phase-control built-ins, located:**
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| built-in | meaning | sites in Stage02 |
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|---|---|---|
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| **6** | end phase (`[ScriptPhase+196] = 1`) | **12** |
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| **62** | force-end, skipping the end event | **3** |
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| **39** | mark last phase (`[phase+300] = 2`) | **8** |
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| 40 | `[phase+300] = 1` | 4 |
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Twelve end-phase sites across three phases — so a phase has several exit paths,
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which is what a mission with win *and* lose branches should look like.
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Argument passing is visible in the disassembly: pairs of
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`set.i k=01,02 <0> <value>` / `set.i k=02,03 <slot> <0>` stage arguments into
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slots, then `call`. Floats are staged the same way — e.g. `40080000` = 3.0
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immediately before several calls.
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## ❔ What this does not settle
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* **The 147 built-ins are uncharacterised.** Without them the disassembly is
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structure without meaning: we can see *that* a phase ends here, not *what was
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tested*. That is the remaining step to per-phase clear conditions.
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* Opcodes 2–11 and 13–18 are named only by handler address. The four-way sharing
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(2/4/6/8 and 3/5/7/9) suggests the handler re-reads the opcode to pick a
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comparison or a type, but that is not yet read.
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* Operand *kinds* (4 of them) are not decoded — the `k=01,02` / `k=02,03` pairs
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are recorded literally.
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* The mission-level stream at `+0x24` of a `.ssb` — as opposed to this ISL
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stream — is still only partly read.
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164
tools/re-capture/isl.py
Executable file
164
tools/re-capture/isl.py
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@@ -0,0 +1,164 @@
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#!/usr/bin/env python3
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"""Disassemble the ISL script bytecode inside a `Stage\\StageNN.ssb`.
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The VM is `ScriptPhase::Update` (`sub_82263408`). Everything below is read off
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the dispatcher and its 25 handlers, not guessed:
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0x822635D4 lwz r11,0(r31) ; instruction = one big-endian u32
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0x822635D8 clrlwi r4,r11,24 ; OPCODE = the LOW byte (= byte[3])
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0x822635DC cmplwi 0x18 ; 25 opcodes
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0x822635FC jump table (25 absolute VAs)
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Each handler advances the pc by `lbz r11,2(r31); add r31,r11,r31`, so
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**byte[2] is the instruction length in bytes**, and bytes [0]/[1] are operand
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kind selectors passed to the operand resolvers as `r4`.
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op 0 `lbz 0` + word@+8 -> resolve ; `lbz 1` + word@+4 -> lvalue ; stw
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(integer assignment; resolvers 0x82271D40 / 0x82272030)
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op 1 same shape with fmr/stfd (float assignment; 0x82271F10/0x82272120)
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op 12 JUMP: r31 = [phase+232] + word@+4
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-> jump operands are **relative to the code base**, which is the .ssb
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header's code offset (0x24). That settles the "file- or
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code-base-relative" question for this opcode at least.
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op 19 CALL BUILT-IN: `sub_82272220` reads the id from **word@+4**
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(`lwz r11,4(r28); cmplwi 0x92` -> 147 built-ins, table 0x8227226C)
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and word@+8 into [phase+200].
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op 20 sets r29=1 and takes the suspend path -> yield/return.
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Handler return codes drive the outer loop: 0 = continue, 1 = suspend,
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2/3 = other exits (`0x82263828`).
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Instruction layout, confirmed by the decode reading cleanly from the code base
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and by every routine ending on a `ret`:
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byte[3] opcode | byte[2] length | byte[1],byte[0] operand kinds
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following words: operands (12 bytes is the common `call` form)
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A `call` carries the built-in id in word@+4 and a monotonically increasing
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STATEMENT ID in word@+8 (0x245, 0x248, 0x24A, ... across a routine) -- the value
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`sub_82272220` stores to `[phase+200]`, i.e. a source-position counter.
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Usage: isl.py <file.ssb> <offset> [count] offsets are FILE offsets
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isl.py <file.ssb> --entry <off> follow from a code-base offset
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isl.py <file.ssb> --calls every built-in call site + histogram
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isl.py <file.ssb> --to <target> [n] resync and disassemble INTO target
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"""
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import struct
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import sys
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CODE_BASE_FIELD = 0x08 # .ssb header: code offset (0x24 in every file)
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# opcode -> (mnemonic, handler VA) from the jump table
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OPS = {
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0: 'set.i', 1: 'set.f',
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2: 'cmp.a', 4: 'cmp.a', 6: 'cmp.a', 8: 'cmp.a',
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3: 'cmp.b', 5: 'cmp.b', 7: 'cmp.b', 9: 'cmp.b',
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10: 'op10', 11: 'op11', 12: 'jmp', 13: 'op13', 14: 'op14', 15: 'op15',
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16: 'op16', 17: 'op17', 18: 'op18', 19: 'call', 20: 'ret',
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21: 'op21', 22: 'op22', 23: 'op23', 24: 'op24',
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}
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def load(path):
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return open(path, 'rb').read()
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def dis(b, off, count=40, code_base=0x24):
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out = []
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for _ in range(count):
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if off + 4 > len(b):
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break
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w = struct.unpack_from('>I', b, off)[0]
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op = w & 0xFF
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ln = (w >> 8) & 0xFF
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k1 = (w >> 24) & 0xFF
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k0 = (w >> 16) & 0xFF
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name = OPS.get(op, 'op%d?' % op)
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words = []
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n = max(ln, 4)
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for i in range(4, n, 4):
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if off + i + 4 <= len(b):
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words.append(struct.unpack_from('>I', b, off + i)[0])
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extra = ''
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if op == 19 and words:
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extra = ' builtin=%d' % words[0]
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elif op == 12 and words:
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extra = ' -> code+0x%X (file 0x%X)' % (words[0], code_base + words[0])
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out.append('%06X: %08X %-6s len=%-3d k=%02x,%02x %s%s' % (
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off, w, name, ln, k1, k0,
|
||||
' '.join('%08X' % x for x in words), extra))
|
||||
if ln == 0:
|
||||
out.append(' (length 0 -- stopping)')
|
||||
break
|
||||
off += ln
|
||||
if op == 20:
|
||||
break
|
||||
return out
|
||||
|
||||
|
||||
def call_sites(b):
|
||||
"""Every `call` in the code region. Scans on the encoding, not by decoding,
|
||||
so a bad length somewhere cannot hide the rest of the file."""
|
||||
code_end = struct.unpack_from('>I', b, 0x0C)[0] # symtab1 = end of code
|
||||
out = []
|
||||
off = struct.unpack_from('>I', b, CODE_BASE_FIELD)[0]
|
||||
while off + 12 <= code_end:
|
||||
w = struct.unpack_from('>I', b, off)[0]
|
||||
if (w & 0xFF) == 0x13 and ((w >> 8) & 0xFF) == 12 and (w >> 16) == 0:
|
||||
bid = struct.unpack_from('>I', b, off + 4)[0]
|
||||
if bid <= 0x92:
|
||||
out.append((off, bid, struct.unpack_from('>I', b, off + 8)[0]))
|
||||
off += 4
|
||||
return out
|
||||
|
||||
|
||||
def resync(b, target, back=400):
|
||||
"""Find a start from which linear decode lands exactly on `target`.
|
||||
|
||||
Instructions are variable-length, so you cannot simply walk backwards; but a
|
||||
wrong start almost always desynchronises into an invalid length, so trying
|
||||
every 4-byte start in a window and keeping the one that hits the target
|
||||
exactly is reliable in practice.
|
||||
"""
|
||||
for start in range(max(0, target - back), target, 4):
|
||||
off = start
|
||||
for _ in range(300):
|
||||
if off >= target or off + 4 > len(b):
|
||||
break
|
||||
ln = (struct.unpack_from('>I', b, off)[0] >> 8) & 0xFF
|
||||
if ln == 0 or ln % 2:
|
||||
off = -1
|
||||
break
|
||||
off += ln
|
||||
if off == target:
|
||||
return start
|
||||
return None
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
b = load(sys.argv[1])
|
||||
if sys.argv[2:3] == ['--calls']:
|
||||
import collections
|
||||
cs = call_sites(b)
|
||||
h = collections.Counter(bid for _, bid, _ in cs)
|
||||
print('%d call sites, %d distinct built-ins' % (len(cs), len(h)))
|
||||
for bid, n in h.most_common():
|
||||
print(' builtin %-4d %5d site(s)' % (bid, n))
|
||||
sys.exit(0)
|
||||
if sys.argv[2:3] == ['--to']:
|
||||
t = int(sys.argv[3], 0)
|
||||
st = resync(b, t)
|
||||
if st is None:
|
||||
print('could not resync into 0x%X' % t); sys.exit(1)
|
||||
print('resync from 0x%X' % st)
|
||||
print('\n'.join(dis(b, st, int(sys.argv[4], 0) if len(sys.argv) > 4 else 40)))
|
||||
sys.exit(0)
|
||||
code_base = struct.unpack_from('>I', b, CODE_BASE_FIELD)[0]
|
||||
a = sys.argv[2]
|
||||
if a == '--entry':
|
||||
off = code_base + int(sys.argv[3], 0)
|
||||
else:
|
||||
off = int(a, 0)
|
||||
cnt = int(sys.argv[4], 0) if len(sys.argv) > 4 else 40
|
||||
print('code base 0x%X, disassembling from 0x%X' % (code_base, off))
|
||||
print('\n'.join(dis(b, off, cnt, code_base)))
|
||||
Reference in New Issue
Block a user