/* * Copyright (C) 2000 Jason Evans . * All rights reserved. * Copyright (C) 2000 Daniel M. Eischen . * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice(s), this list of conditions and the following disclaimer as * the first lines of this file unmodified other than the possible * addition of one or more copyright notices. * 2. Redistributions in binary form must reproduce the above copyright * notice(s), this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD$ */ #include #include #include #include #include #include #include "pthread_private.h" /* Prototypes: */ static inline int check_stack(pthread_t thread, void *stackp); #pragma weak siglongjmp=_thread_siglongjmp #pragma weak longjmp=_thread_longjmp #pragma weak _longjmp=__thread_longjmp void _thread_siglongjmp(sigjmp_buf env, int savemask) { struct pthread *curthread = _get_curthread(); if (check_stack(curthread, (void *) GET_STACK_SJB(env))) PANIC("siglongjmp()ing between thread contexts is undefined by " "POSIX 1003.1"); /* * The stack pointer is somewhere within the threads stack. * Jump to the users context. */ __siglongjmp(env, savemask); } void _thread_longjmp(jmp_buf env, int val) { struct pthread *curthread = _get_curthread(); if (check_stack(curthread, (void *) GET_STACK_JB(env))) PANIC("longjmp()ing between thread contexts is undefined by " "POSIX 1003.1"); /* * The stack pointer is somewhere within the threads stack. * Jump to the users context. */ __longjmp(env, val); } void __thread_longjmp(jmp_buf env, int val) { struct pthread *curthread = _get_curthread(); if (check_stack(curthread, (void *) GET_STACK_JB(env))) PANIC("_longjmp()ing between thread contexts is undefined by " "POSIX 1003.1"); /* * The stack pointer is somewhere within the threads stack. * Jump to the users context. */ ___longjmp(env, val); } /* Returns 0 if stack check is OK, non-zero otherwise. */ static inline int check_stack(pthread_t thread, void *stackp) { void *stack_begin, *stack_end; /* Get the bounds of the current threads stack. */ PTHREAD_ASSERT(thread->stack != NULL, "Thread stack pointer is null"); stack_begin = thread->stack; stack_end = stack_begin + thread->attr.stacksize_attr; /* * Make sure we aren't jumping to a different stack. Make sure * jmp_stackp is between stack_begin and stack end, to correctly detect * this condition regardless of whether the stack grows up or down. */ if (((stackp < stack_begin) && (stackp < stack_end)) || ((stackp > stack_begin) && (stackp > stack_end))) return (1); else return (0); }