1 0c7c441e 2006-02-10 devnull /* Copyright (C) 2001 Free Software Foundation, Inc.
 2 0c7c441e 2006-02-10 devnull    This file is part of the GNU C Library.
 3 0c7c441e 2006-02-10 devnull    Contributed by Jakub Jelinek <jakub@redhat.com>.
 4 0c7c441e 2006-02-10 devnull 
 5 0c7c441e 2006-02-10 devnull    The GNU C Library is free software; you can redistribute it and/or
 6 0c7c441e 2006-02-10 devnull    modify it under the terms of the GNU Lesser General Public
 7 0c7c441e 2006-02-10 devnull    License as published by the Free Software Foundation; either
 8 0c7c441e 2006-02-10 devnull    version 2.1 of the License, or (at your option) any later version.
 9 0c7c441e 2006-02-10 devnull 
10 0c7c441e 2006-02-10 devnull    The GNU C Library is distributed in the hope that it will be useful,
11 0c7c441e 2006-02-10 devnull    but WITHOUT ANY WARRANTY; without even the implied warranty of
12 0c7c441e 2006-02-10 devnull    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 0c7c441e 2006-02-10 devnull    Lesser General Public License for more details.
14 0c7c441e 2006-02-10 devnull 
15 0c7c441e 2006-02-10 devnull    You should have received a copy of the GNU Lesser General Public
16 0c7c441e 2006-02-10 devnull    License along with the GNU C Library; if not, write to the Free
17 0c7c441e 2006-02-10 devnull    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 0c7c441e 2006-02-10 devnull    02111-1307 USA.  */
19 0c7c441e 2006-02-10 devnull 
20 0c7c441e 2006-02-10 devnull #include <ucontext.h>
21 0c7c441e 2006-02-10 devnull 
22 8712d1a3 2006-02-16 devnull #define UC_M_PC 40
23 8712d1a3 2006-02-16 devnull #define UC_M_NPC 48
24 8712d1a3 2006-02-16 devnull 
25 0c7c441e 2006-02-10 devnull extern int __getcontext (ucontext_t *ucp);
26 0c7c441e 2006-02-10 devnull extern int __setcontext (const ucontext_t *ucp, int restoremask);
27 0c7c441e 2006-02-10 devnull 
28 0c7c441e 2006-02-10 devnull int
29 8712d1a3 2006-02-16 devnull swapcontext (ucontext_t *oucp, const ucontext_t *ucp)
30 0c7c441e 2006-02-10 devnull {
31 0c7c441e 2006-02-10 devnull   extern void __swapcontext_ret (void);
32 0c7c441e 2006-02-10 devnull   /* Save the current machine context to oucp.  */
33 0c7c441e 2006-02-10 devnull   __getcontext (oucp);
34 0c7c441e 2006-02-10 devnull   /* Modify oucp to skip the __setcontext call on reactivation.  */
35 8712d1a3 2006-02-16 devnull   *(long*)((char*)oucp+UC_M_PC) = (long)__swapcontext_ret;
36 8712d1a3 2006-02-16 devnull   *(long*)((char*)oucp+UC_M_NPC) = (long)__swapcontext_ret + 4;
37 0c7c441e 2006-02-10 devnull   /* Restore the machine context in ucp.  */
38 0c7c441e 2006-02-10 devnull   __setcontext (ucp, 1);
39 0c7c441e 2006-02-10 devnull   return 0;
40 0c7c441e 2006-02-10 devnull }
41 0c7c441e 2006-02-10 devnull 
42 0c7c441e 2006-02-10 devnull asm ("							\n\
43 0c7c441e 2006-02-10 devnull 	.text						\n\
44 0c7c441e 2006-02-10 devnull 	.type	__swapcontext_ret, #function		\n\
45 0c7c441e 2006-02-10 devnull __swapcontext_ret:					\n\
46 0c7c441e 2006-02-10 devnull 	return	%i7 + 8					\n\
47 0c7c441e 2006-02-10 devnull 	 clr	%o0					\n\
48 0c7c441e 2006-02-10 devnull 	.size	__swapcontext_ret, .-__swapcontext_ret	\n\
49 0c7c441e 2006-02-10 devnull      ");
50 0c7c441e 2006-02-10 devnull