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1 | /* Copyright (C) 2001 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Jakub Jelinek <jakub@redhat.com>. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9bab9806 UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
9bab9806 | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
9bab9806 UD |
19 | |
20 | #include <ucontext.h> | |
21 | ||
22 | extern int __getcontext (ucontext_t *ucp); | |
23 | extern int __setcontext (const ucontext_t *ucp, int restoremask); | |
24 | ||
25 | int | |
26 | __swapcontext (ucontext_t *oucp, const ucontext_t *ucp) | |
27 | { | |
28 | extern void __swapcontext_ret (void); | |
29 | /* Save the current machine context to oucp. */ | |
30 | __getcontext (oucp); | |
31 | /* Modify oucp to skip the __setcontext call on reactivation. */ | |
32 | oucp->uc_mcontext.mc_gregs[MC_PC] = (long) __swapcontext_ret; | |
33 | oucp->uc_mcontext.mc_gregs[MC_NPC] = ((long) __swapcontext_ret) + 4; | |
34 | /* Restore the machine context in ucp. */ | |
35 | __setcontext (ucp, 1); | |
36 | return 0; | |
37 | } | |
38 | ||
39 | asm (" \n\ | |
40 | .text \n\ | |
41 | .type __swapcontext_ret, #function \n\ | |
42 | __swapcontext_ret: \n\ | |
43 | return %i7 + 8 \n\ | |
44 | clr %o0 \n\ | |
45 | .size __swapcontext_ret, .-__swapcontext_ret \n\ | |
46 | "); | |
47 | ||
48 | weak_alias (__swapcontext, swapcontext) |