| 1 | /* vfork for Linux, RISC-V version. |
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| 2 | Copyright (C) 2005-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library. If not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | /* vfork() is just a special case of clone(). */ |
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| 20 | |
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| 21 | #include <sys/asm.h> |
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| 22 | #include <sysdep.h> |
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| 23 | #define __ASSEMBLY__ |
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| 24 | #include <asm/signal.h> |
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| 25 | |
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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 |
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| 28 | wake it up on mm_release. */ |
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| 29 | |
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| 30 | .text |
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| 31 | LEAF (__libc_vfork) |
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| 32 | |
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| 33 | li a0, (CLONE_VFORK | CLONE_VM | SIGCHLD) |
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| 34 | mv a1, sp |
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| 35 | |
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| 36 | li a7, __NR_clone |
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| 37 | scall |
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| 38 | |
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| 39 | bltz a0, 1f |
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| 40 | ret |
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| 41 | |
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| 42 | 1: j __syscall_error |
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| 43 | END (__libc_vfork) |
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| 44 | |
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| 45 | weak_alias (__libc_vfork, vfork) |
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| 46 | strong_alias (__libc_vfork, __vfork) |
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| 47 | libc_hidden_def (__vfork) |
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| 48 | |
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