jni_entrypoints_x86.S revision bf6b92a158053c98b15f4393abb3b86344ec9a20 
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     */
22DEFINE_FUNCTION art_jni_dlsym_lookup_stub
23    subl LITERAL(4), %esp         // align stack
24    CFI_ADJUST_CFA_OFFSET(4)
25    SETUP_GOT                     // pushes ebx
26    pushl %fs:THREAD_SELF_OFFSET  // pass Thread::Current()
27    CFI_ADJUST_CFA_OFFSET(4)
28    call PLT_SYMBOL(artFindNativeMethod)  // (Thread*)
29    UNDO_SETUP_GOT
30    addl LITERAL(8), %esp         // restore the stack
31    CFI_ADJUST_CFA_OFFSET(-12)
32    testl %eax, %eax         // check if returned method code is null
33    jz .Lno_native_code_found     // if null, jump to return to handle
34    jmp *%eax                     // otherwise, tail call to intended method
35.Lno_native_code_found:
36    ret
37END_FUNCTION art_jni_dlsym_lookup_stub
38