| Elliott Hughes | 9ea4d5f | 2013-10-18 18:21:11 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 The Android Open Source Project |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * * Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * * Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in |
| 12 | * the documentation and/or other materials provided with the |
| 13 | * distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 16 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 17 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 18 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 19 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 21 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| 22 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 23 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 24 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 25 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| Elliott Hughes | ed74484 | 2013-11-07 10:31:05 -0800 | [diff] [blame] | 29 | #include <private/bionic_asm.h> |
| Elliott Hughes | 9ea4d5f | 2013-10-18 18:21:11 -0700 | [diff] [blame] | 30 | |
| 31 | // This custom code preserves the return address across the system call. |
| 32 | |
| 33 | ENTRY(vfork) |
| 34 | popq %rdi // Grab the return address. |
| 35 | movl $__NR_vfork, %eax |
| 36 | syscall |
| 37 | pushq %rdi // Restore the return address. |
| 38 | cmpq $-MAX_ERRNO, %rax |
| 39 | jb 1f |
| 40 | negl %eax |
| 41 | movl %eax, %edi |
| 42 | call __set_errno |
| Elliott Hughes | 9ea4d5f | 2013-10-18 18:21:11 -0700 | [diff] [blame] | 43 | 1: |
| 44 | ret |
| 45 | END(vfork) |