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d4697bc9 | 1 | /* Copyright (C) 2001-2014 Free Software Foundation, Inc. |
c9cf6dde AJ |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
c9cf6dde AJ |
17 | |
18 | #include <sysdep.h> | |
19 | #define _ERRNO_H 1 | |
20 | #include <bits/errno.h> | |
21 | ||
22 | /* Clone the calling process, but without copying the whole address space. | |
23 | The calling process is suspended until the new process exits or is | |
24 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, | |
25 | and the process ID of the new process to the old process. */ | |
26 | ||
27 | ENTRY (__vfork) | |
28 | ||
04d12383 AJ |
29 | /* Pop the return PC value into RDI. We need a register that |
30 | is preserved by the syscall and that we're allowed to destroy. */ | |
acd42b78 | 31 | popq %rdi |
0e328c85 | 32 | cfi_adjust_cfa_offset(-8) |
6c30d38f | 33 | cfi_register(%rip, %rdi) |
c9cf6dde | 34 | |
6fadea9f UD |
35 | #ifdef SAVE_PID |
36 | SAVE_PID | |
37 | #endif | |
38 | ||
c9cf6dde AJ |
39 | /* Stuff the syscall number in RAX and enter into the kernel. */ |
40 | movl $SYS_ify (vfork), %eax | |
41 | syscall | |
c9cf6dde | 42 | |
c9cf6dde | 43 | /* Push back the return PC. */ |
04d12383 | 44 | pushq %rdi |
0e328c85 | 45 | cfi_adjust_cfa_offset(8) |
c9cf6dde | 46 | |
6fadea9f UD |
47 | #ifdef RESTORE_PID |
48 | RESTORE_PID | |
49 | #endif | |
50 | ||
acd42b78 UD |
51 | cmpl $-4095, %eax |
52 | jae SYSCALL_ERROR_LABEL /* Branch forward if it failed. */ | |
53 | ||
54 | /* Normal return. */ | |
c9cf6dde AJ |
55 | ret |
56 | ||
57 | PSEUDO_END (__vfork) | |
a4baf360 | 58 | libc_hidden_def (__vfork) |
c9cf6dde AJ |
59 | |
60 | weak_alias (__vfork, vfork) |