154 lines
4.6 KiB
C
154 lines
4.6 KiB
C
/* $NetBSD: pthread_stack.c,v 1.7 2003/03/08 08:03:36 lukem Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Nathan J. Williams.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: pthread_stack.c,v 1.7 2003/03/08 08:03:36 lukem Exp $");
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#include <err.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <ucontext.h>
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#include <unistd.h>
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#include <sys/queue.h>
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#include <sys/mman.h>
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#include <sched.h>
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#include "pthread.h"
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#include "pthread_int.h"
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static pthread_t
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pthread__stackid_setup(void *base, int size);
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/* Allocate a stack for a thread, and set it up. It needs to be aligned, so
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* that a thread can find itself by its stack pointer.
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*/
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int
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pthread__stackalloc(pthread_t *newt)
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{
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void *addr;
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int ret;
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vaddr_t a, b, c, d;
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/* The mmap() interface doesn't let us specify alignment,
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* so we work around it by mmap()'ing twice the needed space,
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* then unmapping the unaligned stuff on the edges.
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*/
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addr = mmap(NULL, 2 * PT_STACKSIZE, PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_PRIVATE, -1, (off_t)0);
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if (addr == MAP_FAILED)
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return ENOMEM;
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a = (vaddr_t) addr;
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if ((a & PT_STACKMASK) != 0) {
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b = (a & ~PT_STACKMASK) + PT_STACKSIZE;
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ret = munmap((void *)a, (size_t)(b-a));
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if (ret == -1)
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return ENOMEM;
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} else {
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b = a;
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}
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c = b + PT_STACKSIZE;
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d = a + 2*PT_STACKSIZE;
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ret = munmap((void *)c, (size_t)(d-c));
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if (ret == -1)
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return ENOMEM;
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*newt = pthread__stackid_setup((void *)b, PT_STACKSIZE);
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return 0;
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}
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/*
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* Set up the slightly special stack for the "initial" thread, which
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* runs on the normal system stack, and thus gets slightly different
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* treatment.
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*/
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void
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pthread__initmain(pthread_t *newt)
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{
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void *base;
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base = (void *) (pthread__sp() & ~PT_STACKMASK);
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*newt = pthread__stackid_setup(base, PT_STACKSIZE);
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}
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static pthread_t
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/*ARGSUSED*/
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pthread__stackid_setup(void *base, int size)
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{
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pthread_t t;
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size_t pagesize;
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int ret;
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/* Protect the next-to-bottom stack page as a red zone. */
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/* XXX assumes that the stack grows down. */
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pagesize = (size_t)sysconf(_SC_PAGESIZE);
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#ifdef __hppa__
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#error "stack does not grow down"
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#endif
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ret = mprotect((char *)base + pagesize, pagesize, PROT_NONE);
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if (ret == -1)
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err(2, "Couldn't mprotect() stack redzone at %p\n",
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(char *)base + pagesize);
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/*
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* Put a pointer to the pthread in the bottom (but
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* redzone-protected section) of the stack.
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*/
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t = base;
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t->pt_stack.ss_sp = (char *)base + 2 * pagesize;
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t->pt_stack.ss_size = PT_STACKSIZE - 2 * pagesize;
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/* Set up an initial ucontext pointer to a "safe" area */
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t->pt_uc =(ucontext_t *)(void *)((char *)t->pt_stack.ss_sp +
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t->pt_stack.ss_size - (pagesize/2));
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#ifdef _UC_UCONTEXT_ALIGN
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t->pt_uc = (ucontext_t *)((uintptr_t)t->pt_uc & _UC_UCONTEXT_ALIGN);
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#endif
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return t;
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}
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