projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 04277e02 | 1 | /* Copyright (C) 2001-2019 Free Software Foundation, Inc. |
| 9bab9806 UD |
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. | |
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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 | 15 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 | 16 | License along with the GNU C Library; if not, see |
| 5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
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18 | |
| 19 | #include <ucontext.h> | |
| 20 | ||
| 21 | extern int __getcontext (ucontext_t *ucp); | |
| 22 | extern int __setcontext (const ucontext_t *ucp, int restoremask); | |
| 23 | ||
| 24 | int | |
| 25 | __swapcontext (ucontext_t *oucp, const ucontext_t *ucp) | |
| 26 | { | |
| 27 | extern void __swapcontext_ret (void); | |
| 28 | /* Save the current machine context to oucp. */ | |
| 29 | __getcontext (oucp); | |
| 30 | /* Modify oucp to skip the __setcontext call on reactivation. */ | |
| 31 | oucp->uc_mcontext.mc_gregs[MC_PC] = (long) __swapcontext_ret; | |
| 32 | oucp->uc_mcontext.mc_gregs[MC_NPC] = ((long) __swapcontext_ret) + 4; | |
| 33 | /* Restore the machine context in ucp. */ | |
| 34 | __setcontext (ucp, 1); | |
| 35 | return 0; | |
| 36 | } | |
| 37 | ||
| 38 | asm (" \n\ | |
| 39 | .text \n\ | |
| 40 | .type __swapcontext_ret, #function \n\ | |
| 41 | __swapcontext_ret: \n\ | |
| 42 | return %i7 + 8 \n\ | |
| 43 | clr %o0 \n\ | |
| 44 | .size __swapcontext_ret, .-__swapcontext_ret \n\ | |
| 45 | "); | |
| 46 | ||
| 47 | weak_alias (__swapcontext, swapcontext) |