projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d4697bc9 | 1 | /* Copyright (C) 1999-2014 Free Software Foundation, Inc. |
| cd641f74 AS |
2 | This file is part of the GNU C Library. |
| 3 | Contributed by Andreas Schwab <schwab@gnu.org>. | |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 3214b89b AJ |
6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| cd641f74 AS |
9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 3214b89b | 13 | Lesser General Public License for more details. |
| cd641f74 | 14 | |
| 3214b89b | 15 | You should have received a copy of the GNU Lesser General Public |
| ab84e3ff PE |
16 | License along with the GNU C Library. If not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| cd641f74 AS |
18 | |
| 19 | #include <sysdep.h> | |
| 20 | #define _ERRNO_H 1 | |
| 21 | #include <bits/errno.h> | |
| 2eb74642 | 22 | #include <kernel-features.h> |
| cd641f74 | 23 | |
| 40111cb9 MK |
24 | #ifndef SAVE_PID |
| 25 | #define SAVE_PID | |
| 26 | #endif | |
| 27 | ||
| 28 | #ifndef RESTORE_PID | |
| 29 | #define RESTORE_PID | |
| 30 | #endif | |
| 31 | ||
| cd641f74 AS |
32 | /* Clone the calling process, but without copying the whole address space. |
| 33 | The calling process is suspended until the new process exits or is | |
| 34 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, | |
| 35 | and the process ID of the new process to the old process. */ | |
| 36 | ||
| 37 | ENTRY (__vfork) | |
| 38 | ||
| 40111cb9 MK |
39 | /* SAVE_PID clobbers call-clobbered registers and |
| 40 | saves data in D1 and A1. */ | |
| 41 | ||
| 42 | SAVE_PID | |
| 2b3dafb0 | 43 | |
| cd641f74 AS |
44 | /* Pop the return PC value into A0. */ |
| 45 | movel %sp@+, %a0 | |
| 50e73d13 AS |
46 | cfi_adjust_cfa_offset (-4) |
| 47 | cfi_register (%pc, %a0) | |
| cd641f74 AS |
48 | |
| 49 | /* Stuff the syscall number in D0 and trap into the kernel. */ | |
| 50 | movel #SYS_ify (vfork), %d0 | |
| 51 | trap #0 | |
| 40111cb9 MK |
52 | |
| 53 | RESTORE_PID | |
| 54 | ||
| cd641f74 AS |
55 | tstl %d0 |
| 56 | jmi .Lerror /* Branch forward if it failed. */ | |
| 57 | ||
| 58 | /* Jump to the return PC. */ | |
| 59 | jmp %a0@ | |
| 60 | ||
| 61 | .Lerror: | |
| 62 | /* Push back the return PC. */ | |
| 63 | movel %a0,%sp@- | |
| 50e73d13 AS |
64 | cfi_adjust_cfa_offset (4) |
| 65 | cfi_rel_offset (%pc, 0) | |
| cd641f74 | 66 | |
| a9f1039f | 67 | #ifndef PIC |
| 2eb74642 | 68 | jbra SYSCALL_ERROR_LABEL |
| 2eb74642 | 69 | #endif |
| cd641f74 AS |
70 | |
| 71 | PSEUDO_END (__vfork) | |
| db160231 | 72 | libc_hidden_def (__vfork) |
| cd641f74 AS |
73 | |
| 74 | weak_alias (__vfork, vfork) |