| 1 | /* Copyright (C) 2000-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 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 |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | |
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| 19 | #include <sysdep.h> |
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| 20 | #define _SIGNAL_H |
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| 21 | #include <bits/signum-arch.h> |
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| 22 | #include <tcb-offsets.h> |
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| 23 | |
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| 24 | /* The following are defined in linux/sched.h, which unfortunately */ |
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| 25 | /* is not safe for inclusion in an assembly file. */ |
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| 26 | #define CLONE_VM 0x00000100 /* set if VM shared between processes */ |
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| 27 | #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ |
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| 28 | |
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| 29 | /* pid_t vfork(void); */ |
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| 30 | /* Implemented as __clone_syscall(CLONE_VFORK | CLONE_VM | SIGCHLD, 0) */ |
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| 31 | |
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| 32 | ENTRY (__libc_vfork) |
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| 33 | .prologue // work around a GAS bug which triggers if |
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| 34 | .body // first .prologue is not at the beginning of proc. |
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| 35 | alloc r2=ar.pfs,0,0,2,0 |
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| 36 | mov out0=CLONE_VM+CLONE_VFORK+SIGCHLD |
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| 37 | mov out1=0 /* Standard sp value. */ |
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| 38 | ;; |
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| 39 | DO_CALL (SYS_ify (clone)) |
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| 40 | cmp.eq p6,p0=0,r8 |
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| 41 | (p6) br.cond.dptk 1f |
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| 42 | 1: |
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| 43 | cmp.eq p6,p0=-1,r10 |
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| 44 | (p6) br.cond.spnt.few __syscall_error |
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| 45 | ret |
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| 46 | PSEUDO_END (__libc_vfork) |
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| 47 | |
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| 48 | strong_alias (__libc_vfork, __vfork) |
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| 49 | libc_hidden_def (__vfork) |
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| 50 | weak_alias (__vfork, vfork) |
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| 51 | |
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