1 files changed, 102 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/hppa/clone.S b/libc/sysdeps/linux/hppa/clone.S
new file mode 100644
index 000000000..56a40eadc
--- /dev/null
+++ b/libc/sysdeps/linux/hppa/clone.S
@@ -0,0 +1,102 @@
+/* Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by David Huggins-Daines <dhd@debian.org>, 2000.
+   Based on the Alpha version by Richard Henderson <rth@tamu.edu>, 1996.
+
+   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>
+#include <sys/syscall.h>
+
+/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */
+
+.text
+.global __clone
+.type   __clone,%function
+__clone:
+	/* FIXME: I have no idea how profiling works on hppa. */
+
+	/* Sanity check arguments.  */
+	comib,=  0,%arg0,.Lerror        /* no NULL function pointers */
+	ldi     -EINVAL,%ret0
+	comib,=  0,%arg1,.Lerror        /* no NULL stack pointers */
+	nop
+
+	/* Save the fn ptr and arg on the new stack.  */
+	stwm    %arg0,64(%arg1)
+	stw	%arg3,-60(%arg1)
+
+	/* Save the PIC register. */
+#ifdef __PIC__
+	stw	%r19,-32(%sr0, %sp)	/* parent */
+#endif
+
+	/* Do the system call */
+	copy	%arg2,%arg0
+	ble     0x100(%sr2,%r0)
+	ldi	__NR_clone,%r20
+
+	ldi	-4096,%r1
+	comclr,>>= %r1,%ret0,%r0	/* Note: unsigned compare. */
+	b,n	.Lerror
+
+	comib,=,n 0,%ret0,thread_start
+
+	/* Successful return from the parent
+	   No need to restore the PIC register, 
+	   since we return immediately. */
+
+	bv	%r0(%rp)
+	nop
+
+	/* Something bad happened -- no child created */
+.Lerror:
+
+	/* Restore the PIC register on error */
+#ifdef __PIC__
+	ldw	-32(%sr0, %sp), %r19	/* parent */
+#endif
+
+	b	__syscall_error
+	sub     %r0,%ret0,%arg0
+
+thread_start:
+
+	/* Load up the arguments.  */
+	ldw	-60(%sr0, %sp),%arg0
+	ldw     -64(%sr0, %sp),%r22
+
+	/* $$dyncall fixes childs PIC register */
+
+	/* Call the user's function */
+	bl	$$dyncall,%r31
+	copy	%r31,%rp
+
+	bl	_exit,%rp
+	copy	%ret0,%arg0
+
+	/* Die horribly.  */
+	iitlbp	%r0,(%r0)
+
+.size __clone,.-__clone
+
+.weak clone
+	clone = __clone