1 files changed, 83 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/frv/clone.S b/libc/sysdeps/linux/frv/clone.S
new file mode 100644
index 000000000..2e3c6b742
--- /dev/null
+++ b/libc/sysdeps/linux/frv/clone.S
@@ -0,0 +1,83 @@
+/* Copyright (C) 2003 Free Software Foudnation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Alexandre Oliva <aoliva@redhat.com>, 2003.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* clone() is even more special than fork() as it mucks with stacks
+   and invokes a function in the right context after its all over.  */
+
+#include <asm/unistd.h>
+#define _ERRNO_H	1
+#include <bits/errno.h>
+
+	.text
+	.globl	__clone
+	.type __clone,@function
+/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */
+__clone:
+	/* Sanity check arguments.  */
+	cmp.p	gr8, gr0, icc0
+	cmp	gr9, gr0, icc1
+	mov.p	gr8, gr4
+	beq	icc0, #0, .Lerror
+	mov.p	gr11, gr5
+	beq	icc1, #0, .Lerror
+
+	mov.p	gr10, gr8
+	setlos	#__NR_clone, gr7
+	tra	gr0,gr0
+
+	cmp	gr8, gr0, icc0
+	bgtlr	icc0, #1
+	beq	icc0, #0, .Lthread_start
+
+.Lsys_error:
+	sethi.p	#gotofffuncdeschi(__syscall_error), gr14
+	setlo	#gotofffuncdesclo(__syscall_error), gr14
+	ldd	@(gr14, gr15), gr14
+	jmpl	@(gr14, gr0)
+
+.Lerror:
+	setlos.p #-EINVAL, gr7
+	bra	.Lsys_error
+
+###############################################################################
+#
+# come here as the new thread [GR4 is fn, GR5 is arg]
+#
+###############################################################################
+.Lthread_start:
+	/* Save the PIC register.  */
+	mov	gr15, gr17
+
+	/* Call the user's function.  */
+	ldd.p	@(gr4, gr0), gr14
+	mov	gr5, gr8
+	calll	@(gr14, gr0)
+
+	/* Call _exit, rather simply inlining the syscall, such that
+	   breakpoints work.*/
+
+	mov.p	gr17, gr15
+	call	_exit
+
+	/* Should never get here.  */
+	jmpl	@(gr0, gr0)
+	.size	__clone,.-__clone
+
+.weak	clone
+	clone = __clone