projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d4697bc9 | 1 | /* Copyright (C) 2000-2014 Free Software Foundation, Inc. |
| d5efd131 MF |
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 | |
| 75efb018 MF |
15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
| d5efd131 MF |
17 | |
| 18 | ||
| 19 | #include <sysdep.h> | |
| 20 | #define _SIGNAL_H | |
| 21 | #include <bits/signum.h> | |
| 22 | #include <tcb-offsets.h> | |
| 23 | ||
| 24 | /* The following are defined in linux/sched.h, which unfortunately */ | |
| 25 | /* is not safe for inclusion in an assembly file. */ | |
| 26 | #define CLONE_VM 0x00000100 /* set if VM shared between processes */ | |
| 27 | #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ | |
| 28 | ||
| 29 | /* pid_t vfork(void); */ | |
| 30 | /* Implemented as __clone_syscall(CLONE_VFORK | CLONE_VM | SIGCHLD, 0) */ | |
| 31 | ||
| 32 | ENTRY(__vfork) | |
| 33 | .prologue // work around a GAS bug which triggers if | |
| 34 | .body // first .prologue is not at the beginning of proc. | |
| 35 | alloc r2=ar.pfs,0,0,2,0 | |
| 36 | adds r14=PID,r13 | |
| 37 | ;; | |
| 38 | ld4 r16=[r14] | |
| 39 | ;; | |
| 40 | sub r15=0,r16 | |
| 41 | cmp.eq p6,p0=0,r16 | |
| 42 | ;; | |
| 43 | (p6) movl r15=0x80000000 | |
| 44 | mov out0=CLONE_VM+CLONE_VFORK+SIGCHLD | |
| 45 | mov out1=0 /* Standard sp value. */ | |
| 46 | ;; | |
| 47 | st4 [r14]=r15 | |
| 48 | DO_CALL (SYS_ify (clone)) | |
| 49 | cmp.eq p6,p0=0,r8 | |
| 50 | adds r14=PID,r13 | |
| 51 | (p6) br.cond.dptk 1f | |
| 52 | ;; | |
| 53 | ld4 r15=[r14] | |
| 54 | ;; | |
| 55 | extr.u r16=r15,0,31 | |
| 56 | ;; | |
| 57 | cmp.eq p0,p6=0,r16 | |
| 58 | ;; | |
| 59 | (p6) sub r16=0,r15 | |
| 60 | ;; | |
| 61 | st4 [r14]=r16 | |
| 62 | 1: | |
| 63 | cmp.eq p6,p0=-1,r10 | |
| 64 | (p6) br.cond.spnt.few __syscall_error | |
| 65 | ret | |
| 66 | PSEUDO_END(__vfork) | |
| 67 | libc_hidden_def (__vfork) | |
| 68 | weak_alias (__vfork, vfork) |