find-CCSPlayer_MovementServices_CheckJumpButton_WaterPatch

CCSPlayer_MovementServices_CheckJumpButton_WaterPatch

Overview

Locate the water jump velocity assignment inside CCSPlayer_MovementServices_CheckJumpButton and generate a patch that changes the immediate value from 100.0f (0x42C80000) to 145.0f (0x43110000).

The target code pattern in pseudocode:

if ( v5 == (int *)0x8000 )    // move type check for water
{
    *(_DWORD *)(a2 + 64) = 1120403456;  // <-- patch target: 100.0f -> 145.0f
}

In assembly, this is a mov dword ptr [reg+40h], 42C80000h instruction. The patch changes the immediate operand from 42C80000h (100.0f) to 43110000h (145.0f).

Prerequisites

• CCSPlayer_MovementServices_CheckJumpButton must already be identified. Use SKILL /get-func-from-yaml with func_name=CCSPlayer_MovementServices_CheckJumpButton to load its address. If YAML does not exist, run SKILL /find-CCSPlayer_MovementServices_CheckJumpButton first.

Location Steps

1. Get CheckJumpButton Function Address

ALWAYS Use SKILL /get-func-from-yaml with func_name=CCSPlayer_MovementServices_CheckJumpButton.

If the skill returns an error, stop and report to user.

2. Decompile and Locate the Water Jump Pattern

Decompile the function:

mcp__ida-pro-mcp__decompile(addr="<func_va>")

In the decompiled output, search for the water jump velocity pattern. The key indicators are:

• A comparison against 0x8000 (water move type)
• Inside the if-block: *(_DWORD *)(a2 + 64) = 1120403456 (which is 100.0f as IEEE 754)
• Note: 1120403456 decimal = 0x42C80000 = 100.0f in IEEE 754 floating point

Note the address annotation on the assignment line.

3. Disassemble Around the Assignment

Disassemble the function around the annotated address to find the exact mov instruction:

mcp__ida-pro-mcp__disasm(addr="<func_va>", offset=<estimated_offset>, max_instructions=20)

Look for this assembly pattern:

cmp     rax, 8000h              ; check water move type
jnz     short loc_XXXXXXXX      ; skip if not water
mov     dword ptr [rsi+40h], 42C80000h  ; <-- patch target: 100.0f