risc-v: initial 64 bit port, static only (no TLS/NPTL)

Only a simple hello world is tested in qemu system emulation.

1 files changed, 42 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/riscv64/vfork.S b/libc/sysdeps/linux/riscv64/vfork.S
new file mode 100644
index 000000000..a624f2a7c
--- /dev/null
+++ b/libc/sysdeps/linux/riscv64/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)