| [a070eff] | 1 | /*
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| 2 | * Copyright (c) 2013 Vojtech Horky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libc
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| 30 | * @{
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| 31 | */
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| 32 | /** @file Long jump implementation.
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| 33 | *
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| 34 | * Implementation inspired by Jiri Zarevucky's code from
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| 35 | * http://bazaar.launchpad.net/~zarevucky-jiri/helenos/stdc/revision/1544/uspace/lib/posix/setjmp.h
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| 36 | */
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| 37 |
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| 38 | #include <setjmp.h>
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| 39 | #include <libarch/fibril.h>
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| 40 | #include <fibril.h>
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| 41 |
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| 42 | struct jmp_buf_interal {
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| 43 | context_t context;
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| 44 | int return_value;
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| 45 | };
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| 46 |
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| 47 | /**
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| 48 | * Save current environment (registers).
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| 49 | *
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| 50 | * This function may return twice.
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| 51 | *
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| 52 | * @param env Variable where to save the environment.
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| 53 | * @return Whether the call returned after longjmp.
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| 54 | * @retval 0 Environment was saved, normal execution.
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| 55 | * @retval other longjmp was executed and returned here.
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| 56 | */
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| 57 | int setjmp(jmp_buf env) {
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| 58 | env->return_value = 0;
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| 59 | context_save(&env[0].context);
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| 60 | return env->return_value;
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| 61 | }
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| 62 |
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| 63 | /**
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| 64 | * Restore environment previously stored by setjmp.
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| 65 | *
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| 66 | * This function never returns.
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| 67 | *
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| 68 | * @param env Variable with the environment previously stored by call
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| 69 | * to setjmp.
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| 70 | * @param val Value to fake when returning from setjmp (0 is transformed to 1).
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| 71 | */
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| 72 | void longjmp(jmp_buf env, int val) {
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| 73 | env[0].return_value = (val == 0) ? 1 : val;
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| 74 | context_restore(&env[0].context);
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| 75 | __builtin_unreachable();
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| 76 | }
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| 77 |
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| 78 | /** @}
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| 79 | */
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