反汇编如何寻找参数（变量）来源

Question

sub esp,0x64
mov eax,dword ptr ds:[0x5AF00C]
xor eax,esp
mov dword ptr ss:[esp+0x60],eax
movss xmm0,dword ptr ds:[0x5AF150]
mulss xmm0,dword ptr ds:[0x593528]
mov eax,dword ptr ss:[esp+0x68]
push ebx
mov ebx,dword ptr ss:[esp+0x74]                     
push ebp
push esi                                            
mov dword ptr ss:[esp+0xC],eax
mov ebp,ecx                                         
cvttss2si eax,xmm0
push edi                                            
push 0x48                                           
mov dword ptr ss:[ebp+0x4],0x0                      
lea edi,dword ptr ss:[esp+0x18]                     
mov ecx,0x17                                        
mov esi,ebx                                         
rep movs dword ptr es:[edi],dword ptr ds:[esi]      
mov esi,dword ptr ss:[esp+0x80]                     

代码如上，我要怎么找到rep movs dword ptr es:[edi],dword ptr ds:[esi]这句的esi的内容被哪里写入的呢？
内存断点没办法在写入之前应用

Answer 1

局部变量，往上翻翻就有了
实在不行用ida转成c看看就知道了

lea edi,[arg.1]
mov ecx,0x17
mov dword ptr ss:[ebp+0x4],eax
lea esi,dword ptr ss:[esp+0x14]

一个传入的参数，一个局部变量，这不是很清楚嘛