find-CBasePlayerPawn_CommitSuicide

Find CBasePlayerPawn_CommitSuicide

Locate CBasePlayerPawn_CommitSuicide in CS2 server.dll or server.so using IDA Pro MCP tools.

Method

1. Get CBasePlayerPawn vtable information:

   ALWAYS Use SKILL /get-vtable-from-yaml with class_name=CBasePlayerPawn.

   Extract vtable_va and vtable_entries from the result.

2. Decompile the virtual function at vtable[398 ~ 402]:

   mcp__ida-pro-mcp__decompile addr="<vtable_entries[index]>"
   

   where index ranges fronm 398 to 402

3. Verify function characteristics to identify CBasePlayerPawn::CommitSuicide:

   The function should look like:

   Windows:

   char __fastcall sub_180BE9210(float *a1, unsigned __int8 a2, char a3)
   {
      __int64 v4; // rbp
      char result; // al
      _BYTE v7[112]; // [rsp+40h] [rbp-138h] BYREF
      __int64 v8; // [rsp+B0h] [rbp-C8h]
      int v9; // [rsp+180h] [rbp+8h] BYREF
      char v10; // [rsp+198h] [rbp+20h] BYREF
   
      v4 = a2;
      result = (*(__int64 (__fastcall **)(float *))(*(_QWORD *)a1 + 1336LL))(a1);
      if ( result )
      {
         sub_1808757E0(&v9, *(_DWORD *)(*((_QWORD *)a1 + 2) + 56LL));
         result = sub_1801C22A0(a1 + 824, (float *)&v9);
         if ( !result || a3 )
         {
            sub_1808757E0(&v9, *(_DWORD *)(*((_QWORD *)a1 + 2) + 56LL));
            a1[824] = *(float *)sub_1801965D0(&v10, &v9);
            sub_180DFABA0((unsigned int)v7, (_DWORD)a1, (_DWORD)a1, 0, 1065353216, (_DWORD)v4 << 6, 0);
            v8 |= (32 * (v4 ^ 1) + 32) | 0x116;
            sub_1803C8520(a1, (__int64)v7, 0LL);//CBaseEntity::TakeDamageOld
            return sub_180DFBEE0((__int64)v7);
         }
      }
      return result;
   }
   

   Linux:

   void __fastcall sub_1628A10(__int64 a1, unsigned __int8 a2, char a3)
   {
      unsigned __int8 (*v4)(void); // rax
      _BYTE v5[112]; // [rsp+0h] [rbp-140h] BYREF
      __int64 v6; // [rsp+70h] [rbp-D0h]
   
      v4 = *(unsigned __int8 (**)(void))(*(_QWORD *)a1 + 1328LL);
      if ( (char *)v4 == (char *)CBaseEntity_IsPlayerPawn )
      {
         if ( *(_BYTE *)(a1 + 1472) )
            return;
      }
      else if ( !v4() )
      {
         return;
      }
      if ( *(float *)(a1 + 4072) <= sub_118C0E0(*(unsigned int *)(*(_QWORD *)(a1 + 16) + 56LL)) || a3 )
      {
         *(float *)(a1 + 4072) = sub_118C0E0(*(unsigned int *)(*(_QWORD *)(a1 + 16) + 56LL)) + 5.0;
         sub_18B0D40(v5, a1, a1, 0LL, a2 << 6, 0LL, 1.0);
         v6 |= (a2 == 0 ? 64LL : 32LL) | 0x116;
         sub_C8A650(a1, v5, 0LL);
         sub_189BA20(v5);//CBaseEntity::TakeDamageOld
      }
   }
   

   where the CBaseEntity::TakeDamageOld can be verified by checking string "CBaseEntity::TakeDamageOld: damagetype %d with info.GetDamagePosition() == Vector::vZero\n" in it's decompiled procedure.

   If the code pattern match, proceed to rename.

4. Rename the function:

   mcp__ida-pro-mcp__rename batch={"func": [{"addr": "<function_addr>", "name": "CBasePlayerPawn_CommitSuicide"}]}
   

5. Generate and validate unique 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 beside the binary:

   ALWAYS Use SKILL /write-vfunc-as-yaml to write the analysis results.

   Required parameters:

   • func_name: CBasePlayerPawn_CommitSuicide
   • func_addr: The function address from step 2
   • func_sig: The validated signature from step 6

   VTable parameters:

   • vtable_name: CBasePlayerPawn
   • vfunc_index: The vtable index from step 3
   • vfunc_offset: vfunc_offset = vfunc_index * 8

Function Characteristics

• Parameters: (this) where this is CBasePlayerPawn pointer
• Purpose: Handles player suicide/death state cleanup and processing
• Key Operations:
  • Sets up player state at offset 0x890 (2192 bytes)
  • Calls cleanup functions
  • Invokes virtual function for death handling
  • Sets death-related flags (bit 21 = 0x200000)
  • Finalizes the suicide process

VTable Information

• VTable Name: CBasePlayerPawn::\vftable'`
• VTable Mangled Name: ??_7CBasePlayerPawn@@6B@ (Windows) / _ZTV16CBasePlayerPawn (Linux)
• VTable Index: 400 (IDA index) / 399 (array index) - This can change when game updates.
• VTable Offset: 0xC78 - This can change when game updates.

• Note that for server.so, the first 16 bytes of "vftable" are for RTTI. The real vftable = _ZTV16CBasePlayerPawn + 0x10.

Unique Identifiers

The function can be uniquely identified by:

1. Offset 0x890 (4C 8D A7 90 08 00 00) - LEA r12, [rdi+890h]

   • This is a1 + 274 in QWORD pointer arithmetic

2. Vtable offset 0xBF8 (FF 90 F8 0B 00 00) - call qword ptr [rax+0BF8h]

   • Virtual function call at index 383
   • This corresponds to (*a1 + 3064) in bytes

3. Sequential function call pattern:

   • Call to view initialization
   • Virtual call at vtable[383]
   • Two helper function calls for offset calculations

Output YAML Format

The output YAML filename depends on the platform:

• server.dll → CBasePlayerPawn_CommitSuicide.windows.yaml
• server.so → CBasePlayerPawn_CommitSuicide.linux.yaml