projects / thirdparty / glibc.git / blame
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| de96d148 | 1 | /* Copyright (C) 1999, 2002, 2003, 2005 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 PE |
16 | License along with the GNU C Library. If not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
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18 | |
| 19 | #include <sysdep.h> | |
| 20 | #define _ERRNO_H 1 | |
| 21 | #include <bits/errno.h> | |
| 227de9dd | 22 | #include <kernel-features.h> |
| 74804c97 UD |
23 | |
| 24 | /* Clone the calling process, but without copying the whole address space. | |
| 25 | The calling process is suspended until the new process exits or is | |
| 26 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, | |
| 27 | and the process ID of the new process to the old process. */ | |
| 28 | ||
| 29 | ENTRY (__vfork) | |
| 30 | ||
| 31 | #ifdef __NR_vfork | |
| 02a9f771 DJ |
32 | #ifdef SAVE_PID |
| 33 | SAVE_PID | |
| 34 | #endif | |
| 73886008 UW |
35 | #ifdef __ARM_EABI__ |
| 36 | /* The DO_CALL macro saves r7 on the stack, to enable generation | |
| 37 | of ARM unwind info. Since the stack is initially shared between | |
| 38 | parent and child of vfork, that saved value could be corrupted. | |
| 39 | To avoid this problem, we save r7 into ip as well, and restore | |
| 40 | from there. */ | |
| 41 | mov ip, r7 | |
| 42 | cfi_register (r7, ip) | |
| 43 | .fnstart | |
| 44 | str r7, [sp, #-4]! | |
| 45 | cfi_adjust_cfa_offset (4) | |
| 46 | .save { r7 } | |
| 47 | ldr r7, =SYS_ify (vfork) | |
| 48 | swi 0x0 | |
| 49 | .fnend | |
| 50 | add sp, sp, #4 | |
| 51 | cfi_adjust_cfa_offset (-4) | |
| 52 | mov r7, ip | |
| 53 | cfi_restore (r7); | |
| 54 | #else | |
| 55 | swi SYS_ify(vfork) | |
| 56 | #endif | |
| 02a9f771 DJ |
57 | #ifdef RESTORE_PID |
| 58 | RESTORE_PID | |
| 59 | #endif | |
| 74804c97 | 60 | cmn a1, #4096 |
| 47f0752a | 61 | RETINSTR(cc, lr) |
| 74804c97 | 62 | |
| 227de9dd | 63 | # ifdef __ASSUME_VFORK_SYSCALL |
| 02a9f771 | 64 | b PLTJMP(SYSCALL_ERROR) |
| 227de9dd | 65 | # else |
| 74804c97 | 66 | /* Check if vfork syscall is known at all. */ |
| 02a9f771 DJ |
67 | cmn a1, #ENOSYS |
| 68 | bne PLTJMP(SYSCALL_ERROR) | |
| 227de9dd | 69 | # endif |
| 74804c97 UD |
70 | #endif |
| 71 | ||
| 227de9dd | 72 | #ifndef __ASSUME_VFORK_SYSCALL |
| 74804c97 | 73 | /* If we don't have vfork, fork is close enough. */ |
| de96d148 | 74 | DO_CALL (fork, 0) |
| 74804c97 | 75 | cmn a1, #4096 |
| 47f0752a | 76 | RETINSTR(cc, lr) |
| 02a9f771 | 77 | b PLTJMP(SYSCALL_ERROR) |
| 011f9a85 UD |
78 | #elif !defined __NR_vfork |
| 79 | # error "__NR_vfork not available and __ASSUME_VFORK_SYSCALL defined" | |
| 227de9dd | 80 | #endif |
| c505de0a | 81 | |
| 74804c97 | 82 | PSEUDO_END (__vfork) |
| db160231 | 83 | libc_hidden_def (__vfork) |
| 74804c97 UD |
84 | |
| 85 | weak_alias (__vfork, vfork) |