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Implement system menu guard opcode

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gamer147
2026-07-29 14:25:29 -04:00
parent 0c7d77805e
commit 2065a1c504
8 changed files with 156 additions and 12 deletions
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5
vm-map/engine-ctx.toml
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@@ -592,3 +592,8 @@ offset = 0xa0ce8
name = "timed_callback_abort_signal"
type = "int"
note = "scheduler-polled abort/input signal cleared when op 0xd5 starts; redirects to abort PC when configured"
[[field]]
offset = 0xa0d10
name = "system_menu_actions_enabled"
type = "int"
note = "op 0x142 replaces this AGERC/IAGEService reentrancy guard; scene reset defaults it to 1, while CONFIG brackets its scripted settings UI with 0 then 1"

17
vm-map/opcodes.toml
View File

@@ -2964,23 +2964,24 @@ observed_types = ["l-int"]
[[opcode]]
op = 0x142
label = "u0041FB10"
label = "set-system-menu-enabled"
argc = 1
abi_source = "kelebek+decode-validated"
[opcode.semantics]
name = "u0041FB10"
category = "unknown"
summary = ""
name = "set-system-menu-enabled"
category = "input"
summary = "(enabled) - replace the EngineCtx flag exposed through IAGEService to gate reentrant native AGERC system-menu actions. Scene reset defaults it to 1; CONFIG writes 0 on entry and 1 immediately before teardown and exit."
details = "Port status (2026-07-29): implemented as an EngineCtx-lifetime signed-dword field on VirtualMachine. Root scene reload restores one. The current Godot frontend has no AGERC native system menu, so the value is retained for exact state parity and a future equivalent menu consumer without affecting game input or persisted settings."
noop_headless = false
source = "kelebek"
confidence = "low"
source = "investigation"
confidence = "high"
depends_on = []
evidence = ""
evidence = "Ghidra /v2: op_0x142_set_system_menu_actions_enabled@0x421fe0 directly stores operand 1 at EngineCtx+0xa0d10. scene_context_init_reset initializes the field to 1. iage_service_query_system_menu_enabled@0x45f7c0 exposes it as a boolean through the AGE:IAGEService vtable at +0xb4. Shipped /support/AGERC.DLL's agerc_refresh_system_menu_state@0x10002e10 calls that method; zero invokes EnableMenuItem(...,MF_GRAYED) for command ids 0x9c63/64/65/68/6c/6e/6f. CONFIG.BIN's only sites bracket its complete scripted settings UI with 0 then 1."
[[opcode.semantics.args]]
i = 1
role = ""
role = "native system-menu actions enabled (zero disables; nonzero enables)"
observed_types = ["imm"]
[[opcode]]