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-rw-r--r--libc/sysdeps/linux/riscv32/vfork.S42
1 files changed, 42 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/riscv32/vfork.S b/libc/sysdeps/linux/riscv32/vfork.S
new file mode 100644
index 000000000..a624f2a7c
--- /dev/null
+++ b/libc/sysdeps/linux/riscv32/vfork.S
@@ -0,0 +1,42 @@
+/* vfork for Linux, RISC-V version.
+ Copyright (C) 2005-2018 Free Software Foundation, Inc.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+/* vfork() is just a special case of clone(). */
+
+#include <sys/asm.h>
+#include <sysdep.h>
+#define __ASSEMBLY__
+#include <linux/sched.h>
+#include <asm/signal.h>
+
+ .text
+LEAF (__vfork)
+
+ li a0, (CLONE_VFORK | CLONE_VM | SIGCHLD)
+ mv a1, sp
+
+ li a7, __NR_clone
+ scall
+
+ bltz a0, 1f
+ ret
+
+1: j __syscall_error
+END (__vfork)
+libc_hidden_def(vfork)
+
+weak_alias (__vfork, vfork)