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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "asm_support_x86.S"
     18 
     19     /*
     20      * Jni dlsym lookup stub.
     21      */
     22 DEFINE_FUNCTION art_jni_dlsym_lookup_stub
     23     subl LITERAL(8), %esp         // align stack
     24     CFI_ADJUST_CFA_OFFSET(8)
     25     pushl %fs:THREAD_SELF_OFFSET  // pass Thread::Current()
     26     CFI_ADJUST_CFA_OFFSET(4)
     27     call SYMBOL(artFindNativeMethod)  // (Thread*)
     28     addl LITERAL(12), %esp        // remove argument & padding
     29     CFI_ADJUST_CFA_OFFSET(-12)
     30     testl %eax, %eax              // check if returned method code is null
     31     jz .Lno_native_code_found     // if null, jump to return to handle
     32     jmp *%eax                     // otherwise, tail call to intended method
     33 .Lno_native_code_found:
     34     ret
     35 END_FUNCTION art_jni_dlsym_lookup_stub
     36