lib/libkvm/kvm_x86_64.c

   1 /*      $NetBSD: kvm_x86_64.c,v 1.10 2014/02/19 20:21:22 dsl Exp $      */
   2
   3 /*-
   4  * Copyright (c) 1989, 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software developed by the Computer Systems
   8  * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
   9  * BG 91-66 and contributed to Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #if defined(LIBC_SCCS) && !defined(lint)
  38 #if 0
  39 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93";
  40 #else
  41 __RCSID("$NetBSD: kvm_x86_64.c,v 1.10 2014/02/19 20:21:22 dsl Exp $");
  42 #endif
  43 #endif /* LIBC_SCCS and not lint */
  44
  45 /*
  46  * x86-64 machine dependent routines for kvm.
  47  */
  48
  49 #include <sys/param.h>
  50 #include <sys/proc.h>
  51 #include <sys/stat.h>
  52 #include <sys/kcore.h>
  53 #include <sys/types.h>
  54
  55 #include <stdlib.h>
  56 #include <unistd.h>
  57 #include <nlist.h>
  58 #include <kvm.h>
  59
  60 #include <uvm/uvm_extern.h>
  61
  62 #include <limits.h>
  63 #include <db.h>
  64
  65 #include "kvm_private.h"
  66
  67 #include <machine/kcore.h>
  68 #include <machine/pmap.h>
  69 #include <machine/pte.h>
  70 #include <machine/vmparam.h>
  71
  72 void
  73 _kvm_freevtop(kvm_t *kd)
  74 {
  75
  76         /* Not actually used for anything right now, but safe. */
  77         if (kd->vmst != 0)
  78                 free(kd->vmst);
  79 }
  80
  81 /*ARGSUSED*/
  82 int
  83 _kvm_initvtop(kvm_t *kd)
  84 {
  85
  86         return (0);
  87 }
  88
  89 /*
  90  * Translate a kernel virtual address to a physical address.
  91  */
  92 int
  93 _kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
  94 {
  95         cpu_kcore_hdr_t *cpu_kh;
  96         u_long page_off;
  97         pd_entry_t pde;
  98         pt_entry_t pte;
  99         paddr_t pde_pa, pte_pa;
 100
 101         if (ISALIVE(kd)) {
 102                 _kvm_err(kd, 0, "vatop called in live kernel!");
 103                 return (0);
 104         }
 105
 106         cpu_kh = kd->cpu_data;
 107
 108         /*
 109          * Find and read all entries to get to the pa.
 110          */
 111
 112         /*
 113          * Level 4.
 114          */
 115         pde_pa = cpu_kh->ptdpaddr + (pl4_pi(va) * sizeof(pd_entry_t));
 116         if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde),
 117             _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
 118                 _kvm_syserr(kd, 0, "could not read PT level 4 entry");
 119                 goto lose;
 120         }
 121         if ((pde & PG_V) == 0) {
 122                 _kvm_err(kd, 0, "invalid translation (invalid level 4 PDE)");
 123                 goto lose;
 124         }
 125
 126         /*
 127          * Level 3.
 128          */
 129         pde_pa = (pde & PG_FRAME) + (pl3_pi(va) * sizeof(pd_entry_t));
 130         if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde),
 131             _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
 132                 _kvm_syserr(kd, 0, "could not read PT level 3 entry");
 133                 goto lose;
 134         }
 135         if ((pde & PG_V) == 0) {
 136                 _kvm_err(kd, 0, "invalid translation (invalid level 3 PDE)");
 137                 goto lose;
 138         }
 139         if (pde & PG_PS) {
 140                 page_off = va & (NBPD_L3 - 1);
 141                 *pa = (pde & PG_1GFRAME) + page_off;
 142                 return (int)(NBPD_L3 - page_off);
 143         }
 144
 145         /*
 146          * Level 2.
 147          */
 148         pde_pa = (pde & PG_FRAME) + (pl2_pi(va) * sizeof(pd_entry_t));
 149         if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde),
 150             _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
 151                 _kvm_syserr(kd, 0, "could not read PT level 2 entry");
 152                 goto lose;
 153         }
 154         if ((pde & PG_V) == 0) {
 155                 _kvm_err(kd, 0, "invalid translation (invalid level 2 PDE)");
 156                 goto lose;
 157         }
 158         if (pde & PG_PS) {
 159                 page_off = va & (NBPD_L2 - 1);
 160                 *pa = (pde & PG_2MFRAME) + page_off;
 161                 return (int)(NBPD_L2 - page_off);
 162         }
 163
 164         /*
 165          * Level 1.
 166          */
 167         pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t));
 168         if (_kvm_pread(kd, kd->pmfd, (void *) &pte, sizeof(pte),
 169             _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
 170                 _kvm_syserr(kd, 0, "could not read PTE");
 171                 goto lose;
 172         }
 173         /*
 174          * Validate the PTE and return the physical address.
 175          */
 176         if ((pte & PG_V) == 0) {
 177                 _kvm_err(kd, 0, "invalid translation (invalid PTE)");
 178                 goto lose;
 179         }
 180         page_off = va & PGOFSET;
 181         *pa = (pte & PG_FRAME) + page_off;
 182         return (int)(NBPG - page_off);
 183
 184  lose:
 185         *pa = (u_long)~0L;
 186         return (0);
 187 }
 188
 189 /*
 190  * Translate a physical address to a file-offset in the crash dump.
 191  */
 192 off_t
 193 _kvm_pa2off(kvm_t *kd, paddr_t pa)
 194 {
 195         cpu_kcore_hdr_t *cpu_kh;
 196         phys_ram_seg_t *ramsegs;
 197         off_t off;
 198         int i;
 199
 200         cpu_kh = kd->cpu_data;
 201         ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh));
 202
 203         off = 0;
 204         for (i = 0; i < cpu_kh->nmemsegs; i++) {
 205                 if (pa >= ramsegs[i].start &&
 206                     (pa - ramsegs[i].start) < ramsegs[i].size) {
 207                         off += (pa - ramsegs[i].start);
 208                         break;
 209                 }
 210                 off += ramsegs[i].size;
 211         }
 212
 213         return (kd->dump_off + off);
 214 }
 215
 216 /*
 217  * Machine-dependent initialization for ALL open kvm descriptors,
 218  * not just those for a kernel crash dump.  Some architectures
 219  * have to deal with these NOT being constants!  (i.e. m68k)
 220  */
 221 int
 222 _kvm_mdopen(kvm_t *kd)
 223 {
 224
 225         kd->usrstack = USRSTACK;
 226         kd->min_uva = VM_MIN_ADDRESS;
 227         kd->max_uva = VM_MAXUSER_ADDRESS;
 228
 229         return (0);
 230 }