Update for the SH port from Jean-Yves Avenard <jean-yves_avenard@hp.com>

1 files changed, 123 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/sh/vfork.S b/libc/sysdeps/linux/sh/vfork.S
new file mode 100644
index 000000000..6b20cc3bb
--- /dev/null
+++ b/libc/sysdeps/linux/sh/vfork.S
@@ -0,0 +1,123 @@
+/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+   Copyright (C) 2001 Hewlett-Packard Australia

+

+ This program is free software; you can redistribute it and/or modify it under
+ the terms of the GNU Library General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at your option) any
+ later version.
+
+ This program 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 Library General Public License for more
+ details.
+
+ You should have received a copy of the GNU Library General Public License
+ along with this program; if not, write to the Free Software Foundation, Inc.,
+ 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ Derived in part from the Linux-8086 C library, the GNU C Library, and several
+ other sundry sources.  Files within this library are copyright by their
+ respective copyright holders.

+*/
+
+#include <sysdep.h>
+#define _ERRNO_H	1
+#include <bits/errno.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.  */
+
+.global errno
+
+ENTRY (__vfork)
+
+	mov.l	@r15+,r3		// pop value from the stack
+	mov.l	.L5,r1
+	mov.l	r3,@r1			// save it in .sav_stack
+
+	mov.w	.L3, r3
+
+#ifdef HIOS
+	trapa	#0x28
+#else
+	trapa	#0x10
+#endif
+
+	mov     r0, r1
+// 12 arithmetic shifts for the crappy sh2, because shad doesn't exist!	
+	shar	r1
+	shar	r1
+	shar	r1
+	shar	r1
+	shar	r1
+	shar	r1
+	shar	r1
+	shar	r1
+	shar	r1
+	shar	r1
+	shar	r1
+	shar	r1
+
+//	mov	#-12, r2
+//	shad	r2, r1
+	not	r1, r1			// r1=0 means r0 = -1 to -4095
+	tst	r1, r1			// i.e. error in linux
+	bf	1f
+	mov.w	.L1, r1
+	cmp/eq	r1, r0
+	bt	2f
+	mov.l	.L2, r1
+	jmp	@r1
+	 mov	r0, r4
+
+	.align	4
+
+1:
+	mov.l	.L5,r1
+	mov.l	@r1,r3			// get it from .sav_stack
+	mov.l	r3,@-r15		// restore value to the stack
+
+	rts
+	 nop
+
+	.align	4
+
+2:
+__syscall_error:
+	/* Store it in errno... */
+	mov.l	.L4, r1
+	mov.l	r0, @r1
+
+	mov.l	.L5,r1
+	mov.l	@r1,r3			// get it from .sav_stack
+	mov.l	r3,@-r15		// restore value to the stack
+
+	/* And just kick back a -1.  */
+	rts
+	 mov	#-1, r0
+
+	.align	4
+.L1:
+	.word	-ENOSYS
+.L3:
+	.word	190			//__NR_vfork
+
+	.align	4			// Shouldn't be necessary as previously with have two words
+.L2:
+	.long	__syscall_error
+
+.L4:	.long	errno
+
+.L5:	.long	.sav_stack
+
+	.data
+
+	.align 4
+
+.sav_stack:					//area to temporary save the stach
+	.long	0
+
+.weak	vfork
+vfork = __vfork