signed int __fastcall JNI_OnLoad(_JavaVM *a1)

((int (__fastcall *)(_JavaVM *, _JNIEnv **, signed int))v1->functions->GetEnv)(v1, &v8, 65540)  
    /*  v1:JavaVM  v8:JniEnv  65540:jni version */

((int (__fastcall *)(_JNIEnv *, char *))v3->functions->FindClass)(v3, v4)   
    /*  v3:JNIEnv  v4:类名    */

((int (__fastcall *)(_JNIEnv *, int, char **, signed int))v3->functions->RegisterNatives)(v3, v5, off_400C, 2)
    /*  v3:JniEnv  v5:FindClass得到的jclass对象  off_400C:要注册的methods  2:注册的methods个数
        method的格式为：函数名 函数描述(smali格式) 函数指针
        例如(in ida)：
            DCD aHello              ; "hello"
            DCD aLjavaLangStr_1     ; "()Ljava/lang/String;"
            DCD native_hello+1
    */

void soinfo::CallConstructors() {
    ...
    // DT_INIT should be called before DT_INIT_ARRAY if both are present.
    CallFunction("DT_INIT", init_func);
    CallArray("DT_INIT_ARRAY", init_array, init_array_count, false);    // CallArray 中也会调用 CallFunction 函数
}

void soinfo::CallFunction(const char* function_name UNUSED, linker_function_t function) {
  if (function == NULL || reinterpret_cast<uintptr_t>(function) == static_cast<uintptr_t>(-1)) {
    return;
  }

  TRACE("[ Calling %s @ %p for '%s' ]", function_name, function, name);
  function();
  TRACE("[ Done calling %s @ %p for '%s' ]", function_name, function, name);

  // The function may have called dlopen(3) or dlclose(3), so we need to ensure our data structures
  // are still writable. This happens with our debug malloc (see http://b/7941716).
  set_soinfo_pool_protection(PROT_READ | PROT_WRITE);
}

// Encryption/Decryption with RC6-w/r/b
//
// Input:   Plaintext stored in four w-bit input registers A, B, C & D
//  r is the number of rounds
//  w-bit round keys S[0, ... , 2r + 3]
//
// Output: Ciphertext stored in A, B, C, D
//
// '''Encryption Procedure:'''

  B = B + S[0]
  D = D + S[1]
  for i = 1 to r do
  {
    t = (B*(2B + 1)) <<< lg w
    u = (D*(2D + 1)) <<< lg w
    A = ((A ⊕ t) <<< u) + S[2i]
    C = ((C ⊕ u) <<< t) + S[2i + 1]
                (A, B, C, D)  =  (B, C, D, A)
  }
  A = A + S[2r + 2]
  C = C + S[2r + 3]

B               loc_XXXX

PUSH            {R0,R4,R5,R7,LR}
SUB             SP, SP, #8
MOV             R2, R2
ADD             SP, SP, #8
ADD.W           R0, R0, #1
SUB.W           R0, R0, #1
MOV             R3, R3
POP.W           {R0,R4,R5,R7,LR}
ADD.W           R1, R1, #1
SUB.W           R1, R1, #1

PUSH.W          {R4-R10,LR}
POP.W           {R4-R10,LR}

 for i from 0 to 255
     S[i] := i
 endfor
 j := 0
 for( i=0 ; i<256 ; i++)
     j := (j + S[i] + key[i mod keylength]) % 256
     swap values of S[i] and S[j]
 endfor

 i := 0
 j := 0
 while GeneratingOutput:
     i := (i + 1) mod 256   //a
     j := (j + S[i]) mod 256 //b
     swap values of S[i] and S[j]  //c
     k := inputByte ^ S[(S[i] + S[j]) % 256]
     output K
 endwhile

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