projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d614a753 | 1 | /* Copyright (C) 1999-2020 Free Software Foundation, Inc. |
| 74804c97 UD |
2 | This file is part of the GNU C Library. |
| 3 | Contributed by Philip Blundell <philb@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. | |
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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. |
| 74804c97 | 14 | |
| 3214b89b | 15 | You should have received a copy of the GNU Lesser General Public |
| ab84e3ff | 16 | License along with the GNU C Library. If not, see |
| 5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
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18 | |
| 19 | #include <sysdep.h> | |
| 20 | #define _ERRNO_H 1 | |
| 21 | #include <bits/errno.h> | |
| 5675da1e RM |
22 | #include <tcb-offsets.h> |
| 23 | ||
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24 | |
| 25 | /* Clone the calling process, but without copying the whole address space. | |
| 26 | The calling process is suspended until the new process exits or is | |
| 27 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, | |
| 28 | and the process ID of the new process to the old process. */ | |
| 29 | ||
| 30 | ENTRY (__vfork) | |
| 73886008 UW |
31 | /* The DO_CALL macro saves r7 on the stack, to enable generation |
| 32 | of ARM unwind info. Since the stack is initially shared between | |
| 33 | parent and child of vfork, that saved value could be corrupted. | |
| 34 | To avoid this problem, we save r7 into ip as well, and restore | |
| 35 | from there. */ | |
| 36 | mov ip, r7 | |
| 37 | cfi_register (r7, ip) | |
| 38 | .fnstart | |
| 55668624 | 39 | push { r7 } |
| 73886008 UW |
40 | cfi_adjust_cfa_offset (4) |
| 41 | .save { r7 } | |
| 42 | ldr r7, =SYS_ify (vfork) | |
| 43 | swi 0x0 | |
| 44 | .fnend | |
| 45 | add sp, sp, #4 | |
| 46 | cfi_adjust_cfa_offset (-4) | |
| 47 | mov r7, ip | |
| 5675da1e RM |
48 | cfi_restore (r7) |
| 49 | ||
| 74804c97 | 50 | cmn a1, #4096 |
| 6ccd0107 | 51 | it cc |
| 47f0752a | 52 | RETINSTR(cc, lr) |
| 74804c97 | 53 | |
| 02a9f771 | 54 | b PLTJMP(SYSCALL_ERROR) |
| 74804c97 | 55 | PSEUDO_END (__vfork) |
| db160231 | 56 | libc_hidden_def (__vfork) |
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57 | |
| 58 | weak_alias (__vfork, vfork) | |
| 5675da1e | 59 | strong_alias (__vfork, __libc_vfork) |