df08823d07
Centralize calculation of signal and ucode delivered on unhandled page fault in new function vm_fault_trap(). MD trap_pfault() now almost always uses the signal numbers and error codes calculated in consistent MI way. This introduces the protection fault compatibility sysctls to all non-x86 architectures which did not have that bug, but apparently they were already much more wrong in selecting delivered signals on protection violations. Change the delivered signal for accesses to mapped area after the backing object was truncated. According to POSIX description for mmap(2): The system shall always zero-fill any partial page at the end of an object. Further, the system shall never write out any modified portions of the last page of an object which are beyond its end. References within the address range starting at pa and continuing for len bytes to whole pages following the end of an object shall result in delivery of a SIGBUS signal. An implementation may generate SIGBUS signals when a reference would cause an error in the mapped object, such as out-of-space condition. Adjust according to the description, keeping the existing compatibility code for SIGSEGV/SIGBUS on protection failures. For situations where kernel cannot handle page fault due to resource limit enforcement, SIGBUS with a new error code BUS_OBJERR is delivered. Also, provide a new error code SEGV_PKUERR for SIGSEGV on amd64 due to protection key access violation. vm_fault_hold() is renamed to vm_fault(). Fixed some nits in trap_pfault()s like mis-interpreting Mach errors as errnos. Removed unneeded truncations of the fault addresses reported by hardware. PR: 211924 Reviewed by: alc Discussed with: jilles, markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D21566
148 lines
4.9 KiB
C
148 lines
4.9 KiB
C
/*-
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* SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
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*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)vm_param.h 8.1 (Berkeley) 6/11/93
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $FreeBSD$
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*/
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/*
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* Machine independent virtual memory parameters.
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*/
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#ifndef _VM_PARAM_
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#define _VM_PARAM_
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#include <machine/vmparam.h>
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/*
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* CTL_VM identifiers
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*/
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#define VM_TOTAL 1 /* struct vmtotal */
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#define VM_METER VM_TOTAL/* deprecated, use VM_TOTAL */
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#define VM_LOADAVG 2 /* struct loadavg */
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#define VM_V_FREE_MIN 3 /* vm_cnt.v_free_min */
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#define VM_V_FREE_TARGET 4 /* vm_cnt.v_free_target */
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#define VM_V_FREE_RESERVED 5 /* vm_cnt.v_free_reserved */
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#define VM_V_INACTIVE_TARGET 6 /* vm_cnt.v_inactive_target */
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#define VM_OBSOLETE_7 7 /* unused, formerly v_cache_min */
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#define VM_OBSOLETE_8 8 /* unused, formerly v_cache_max */
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#define VM_V_PAGEOUT_FREE_MIN 9 /* vm_cnt.v_pageout_free_min */
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#define VM_OBSOLETE_10 10 /* pageout algorithm */
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#define VM_SWAPPING_ENABLED 11 /* swapping enabled */
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#define VM_OVERCOMMIT 12 /* vm.overcommit */
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#define VM_MAXID 13 /* number of valid vm ids */
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/*
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* Structure for swap device statistics
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*/
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#define XSWDEV_VERSION 2
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struct xswdev {
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u_int xsw_version;
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dev_t xsw_dev;
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int xsw_flags;
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int xsw_nblks;
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int xsw_used;
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};
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/*
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* Return values from the VM routines.
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*/
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#define KERN_SUCCESS 0
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#define KERN_INVALID_ADDRESS 1
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#define KERN_PROTECTION_FAILURE 2
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#define KERN_NO_SPACE 3
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#define KERN_INVALID_ARGUMENT 4
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#define KERN_FAILURE 5
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#define KERN_RESOURCE_SHORTAGE 6
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#define KERN_NOT_RECEIVER 7
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#define KERN_NO_ACCESS 8
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#define KERN_OUT_OF_BOUNDS 9
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#ifndef PA_LOCK_COUNT
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#ifdef SMP
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#define PA_LOCK_COUNT 32
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#else
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#define PA_LOCK_COUNT 1
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#endif /* !SMP */
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#endif /* !PA_LOCK_COUNT */
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#ifndef KSTACK_MAX_PAGES
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#define KSTACK_MAX_PAGES 32
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#endif
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#ifndef PHYS_AVAIL_ENTRIES
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#define PHYS_AVAIL_ENTRIES (VM_PHYSSEG_MAX * 2)
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#endif
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#define PHYS_AVAIL_COUNT (PHYS_AVAIL_ENTRIES + 2)
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#ifndef ASSEMBLER
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#ifdef _KERNEL
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#define num_pages(x) \
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((vm_offset_t)((((vm_offset_t)(x)) + PAGE_MASK) >> PAGE_SHIFT))
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extern unsigned long maxtsiz;
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extern unsigned long dfldsiz;
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extern unsigned long maxdsiz;
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extern unsigned long dflssiz;
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extern unsigned long maxssiz;
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extern unsigned long sgrowsiz;
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#endif /* _KERNEL */
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#endif /* ASSEMBLER */
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#endif /* _VM_PARAM_ */
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