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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 | |
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15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
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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 | mov out0=CLONE_VM+CLONE_VFORK+SIGCHLD | |
42 | mov out1=0 /* Standard sp value. */ | |
43 | ;; | |
44 | st4 [r14]=r15 | |
45 | DO_CALL (SYS_ify (clone)) | |
46 | cmp.eq p0,p7=0,r8 | |
47 | adds r14=PID,r13 | |
48 | ;; | |
49 | (p7) ld4 r16=[r14] | |
50 | cmp.eq p6,p0=-1,r10 | |
51 | ;; | |
52 | (p7) sub r15=0,r16 | |
53 | ;; | |
54 | (p7) st4 [r14]=r15 | |
55 | (p6) br.cond.spnt.few __syscall_error | |
56 | ret | |
57 | PSEUDO_END(__vfork) | |
58 | ||
59 | weak_alias (__vfork, vfork) |