find-CBaseEntity_SetGroundEntity: Скилл поиска функции в CS2

--- name: find-CBaseEntity_SetGroundEntity description: Find and identify the CBaseEntity_SetGroundEntity function in CS2 binary using IDA Pro MCP. Use this skill when reverse engineering CS2 server.dll or libserver.so to locate the SetGroundEntity function by analyzing CTriggerPush_Touch's decompiled code for a specific call pattern within the spawnflags 0x80 branch. disable-model-invocation: true --- # Find CBaseEntity_SetGroundEntity Locate `CBaseEntity_SetGroundEntity` in CS2 server.dll or libserver.so using IDA Pro MCP tools. ## Method ### 1. Get CTriggerPush_Touch Function Info **ALWAYS** Use SKILL `/get-func-from-yaml` with `func_name=CTriggerPush_Touch`. If the skill returns an error, stop and report to user. ### 2. Decompile CTriggerPush_Touch ``` mcp__ida-pro-mcp__decompile addr="<func_va>" ``` ### 3. Locate CBaseEntity_SetGroundEntity in the Decompiled Code Find the following code pattern inside the `(spawnflags & 0x80) != 0` branch: ```c if ( (*(_DWORD *)(a1 + <offset>) & 0x80) != 0 ) { // ... vector math and dot product calculation ... if ( v_dotproduct > 0.0 ) sub_XXXXXXXX(a2, 0LL, 0LL); // <-- This is CBaseEntity_SetGroundEntity sub_YYYYYYYY(a1); } ``` **Identification criteria:** - Inside the `& 0x80` spawnflags branch (NOT the else branch) - Called with exactly 3 arguments: `(a2, 0, 0)` — the touched entity and two NULL pointers - Immediately followed by another call that takes only `a1` (the trigger entity) - Guarded by a `> 0.0` dot product check Extract the address of this call target as the `CBaseEntity_SetGroundEntity` address. ### 4. Rename the Function ``` mcp__ida-pro-mcp__rename batch={"func": [{"addr": "<function_addr>", "name": "CBaseEntity_SetGroundEntity"}]} ``` ### 5. Generate Signature **ALWAYS** Use SKILL `/generate-signature-for-function` to generate a robust and unique signature for the function. ### 6. Write IDA Analysis Output as YAML **ALWAYS** Use SKILL `/write-func-as-yaml` to write the analysis results. Required parameters: - `func_name`: `CBaseEntity_SetGroundEntity` - `func_addr`: The function address from step 3 - `func_sig`: The validated signature from step 5 ## Function Characteristics - **Type**: Non-virtual (regular) function - **Parameters**: `(entity, ground_entity, unknown)` — typically called as `(touched_entity, NULL, NULL)` to clear ground entity - **Purpose**: Sets or clears the ground entity for a given entity, used in trigger push logic to unground a pushed entity ## Output YAML Format The output YAML filename depends on the platform: - `server.dll` → `CBaseEntity_SetGroundEntity.windows.yaml` - `libserver.so` / `libserver.so` → `CBaseEntity_SetGroundEntity.linux.yaml`