| 1 | /* Copyright (C) 2001-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <ucontext.h> |
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| 19 | |
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| 20 | extern int __getcontext (ucontext_t *ucp); |
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| 21 | extern int __setcontext (const ucontext_t *ucp, int restoremask); |
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| 22 | |
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| 23 | int |
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| 24 | __swapcontext (ucontext_t *oucp, const ucontext_t *ucp) |
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| 25 | { |
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| 26 | extern void __swapcontext_ret (void); |
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| 27 | /* Save the current machine context to oucp. */ |
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| 28 | __getcontext (ucp: oucp); |
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| 29 | /* Modify oucp to skip the __setcontext call on reactivation. */ |
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| 30 | oucp->uc_mcontext.mc_gregs[MC_PC] = (long) __swapcontext_ret; |
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| 31 | oucp->uc_mcontext.mc_gregs[MC_NPC] = ((long) __swapcontext_ret) + 4; |
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| 32 | /* Restore the machine context in ucp. */ |
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| 33 | __setcontext (ucp, restoremask: 1); |
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| 34 | return 0; |
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| 35 | } |
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| 36 | |
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| 37 | asm (" \n\ |
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| 38 | .text \n\ |
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| 39 | .type __swapcontext_ret, #function \n\ |
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| 40 | __swapcontext_ret: \n\ |
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| 41 | return %i7 + 8 \n\ |
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| 42 | clr %o0 \n\ |
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| 43 | .size __swapcontext_ret, .-__swapcontext_ret \n\ |
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| 44 | " ); |
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| 45 | |
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| 46 | weak_alias (__swapcontext, swapcontext) |
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| 47 | |
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