201 lines
5.4 KiB
C
201 lines
5.4 KiB
C
/* $OpenBSD: kvm_mips64.c,v 1.17 2021/12/01 16:53:28 deraadt Exp $ */
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/* $NetBSD: kvm_mips.c,v 1.3 1996/03/18 22:33:44 thorpej Exp $ */
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/*-
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* Copyright (c) 1989, 1992, 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 developed by the Computer Systems
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* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
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* BG 91-66 and contributed to Berkeley. Modified for MIPS by Ralph Campbell.
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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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/*
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* MIPS machine dependent routines for kvm. Hopefully, the forthcoming
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* vm code will one day obsolete this module.
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*/
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#include <sys/types.h>
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#include <sys/signal.h>
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <nlist.h>
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#include <kvm.h>
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#include <limits.h>
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#include <db.h>
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#include "kvm_private.h"
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#include <machine/cpu.h>
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#include <machine/pte.h>
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#include <machine/pmap.h>
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#include <uvm/uvm_extern.h>
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struct vmstate {
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pt_entry_t *Sysmap;
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u_int Sysmapsize;
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vaddr_t Sysmapbase;
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int pagesize;
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int pagemask;
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int pageshift;
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};
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void
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_kvm_freevtop(kvm_t *kd)
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{
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free(kd->vmst);
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kd->vmst = NULL;
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}
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int
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_kvm_initvtop(kvm_t *kd)
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{
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struct vmstate *vm;
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struct nlist nl[4];
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struct uvmexp uvmexp;
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vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
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if (vm == 0)
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return (-1);
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kd->vmst = vm;
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nl[0].n_name = "Sysmap";
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nl[1].n_name = "Sysmapsize";
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nl[2].n_name = "uvmexp";
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nl[3].n_name = 0;
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if (kvm_nlist(kd, nl) != 0) {
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_kvm_err(kd, kd->program, "bad namelist");
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return (-1);
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}
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if (KREAD(kd, (u_long)nl[0].n_value, &vm->Sysmap)) {
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_kvm_err(kd, kd->program, "cannot read Sysmap");
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return (-1);
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}
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if (KREAD(kd, (u_long)nl[1].n_value, &vm->Sysmapsize)) {
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_kvm_err(kd, kd->program, "cannot read Sysmapsize");
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return (-1);
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}
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/*
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* We are only interested in the first three fields of struct
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* uvmexp, so do not try to read more than necessary (especially
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* in case the layout changes).
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*/
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if (kvm_read(kd, (u_long)nl[2].n_value, &uvmexp,
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3 * sizeof(int)) != 3 * sizeof(int)) {
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_kvm_err(kd, kd->program, "cannot read uvmexp");
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return (-1);
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}
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vm->pagesize = uvmexp.pagesize;
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vm->pagemask = uvmexp.pagemask;
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vm->pageshift = uvmexp.pageshift;
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/*
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* Older kernels might not have this symbol; in which case
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* we use the value of VM_MIN_KERNEL_ADDRESS they must have.
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*/
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nl[0].n_name = "Sysmapbase";
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nl[1].n_name = 0;
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if (kvm_nlist(kd, nl) != 0 ||
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KREAD(kd, (u_long)nl[0].n_value, &vm->Sysmapbase))
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vm->Sysmapbase = (vaddr_t)CKSSEG_BASE;
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return (0);
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}
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/*
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* Translate a kernel virtual address to a physical address.
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*/
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int
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_kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa)
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{
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struct vmstate *vm;
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pt_entry_t pte;
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u_long idx, addr;
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int offset;
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if (ISALIVE(kd)) {
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_kvm_err(kd, 0, "vatop called in live kernel!");
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return((off_t)0);
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}
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vm = kd->vmst;
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offset = (int)va & vm->pagemask;
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/*
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* If we are initializing (kernel segment table pointer not yet set)
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* then return pa == va to avoid infinite recursion.
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*/
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if (vm->Sysmap == 0) {
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*pa = va;
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return vm->pagesize - offset;
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}
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/*
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* Check for direct-mapped segments
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*/
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if (IS_XKPHYS(va)) {
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*pa = XKPHYS_TO_PHYS(va);
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return vm->pagesize - offset;
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}
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if (va >= (vaddr_t)CKSEG0_BASE && va < (vaddr_t)CKSSEG_BASE) {
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*pa = CKSEG0_TO_PHYS(va);
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return vm->pagesize - offset;
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}
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if (va < vm->Sysmapbase)
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goto invalid;
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idx = (va - vm->Sysmapbase) >> vm->pageshift;
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if (idx >= vm->Sysmapsize)
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goto invalid;
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addr = (u_long)vm->Sysmap + idx;
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/*
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* Can't use KREAD to read kernel segment table entries.
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* Fortunately it is 1-to-1 mapped so we don't have to.
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*/
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if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte),
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(off_t)addr) < 0)
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goto invalid;
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if (!(pte & PG_V))
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goto invalid;
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*pa = (pte & PG_FRAME) | (paddr_t)offset;
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return vm->pagesize - offset;
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invalid:
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_kvm_err(kd, 0, "invalid address (%lx)", va);
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return (0);
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}
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off_t
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_kvm_pa2off(kvm_t *kd, paddr_t pa)
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{
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_kvm_err(kd, 0, "pa2off going to be implemented!");
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return 0;
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}
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