tile: add basic support for tilegx

This adds basic support for tile architecture.
Only static binaries, no ld.so or threading support.
Tested with qemu-tilegx only.

1 files changed, 45 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/tile/vfork.S b/libc/sysdeps/linux/tile/vfork.S
new file mode 100644
index 000000000..ab104a0c1
--- /dev/null
+++ b/libc/sysdeps/linux/tile/vfork.S
@@ -0,0 +1,45 @@
+/* Copyright (C) 2011-2018 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/>.  */
+
+#include <sysdep.h>
+#define __ASSEMBLY__  /* for kernel headers */
+#include <linux/sched.h>
+#include <asm/signal.h>
+
+/* Clone the calling process, but without copying the whole address space.
+   The calling process is suspended until the new process exits or is
+   replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
+   and the process ID of the new process to the old process.  */
+
+	.text
+ENTRY (__vfork)
+	{
+	 moveli r0, CLONE_VFORK | CLONE_VM | SIGCHLD
+	 move r1, zero
+	}
+	{
+	 move r2, zero
+	 move r3, zero
+	}
+	moveli TREG_SYSCALL_NR_NAME, __NR_clone
+	swint1
+
+	bnez r1, 0f
+	jrp lr
+PSEUDO_END (__vfork)
+libc_hidden_def (vfork)
+
+weak_alias (__vfork, vfork)