lib/libkvm/kvm_minidump_arm.c

   1 /*-
   2  * Copyright (c) 2008 Semihalf, Grzegorz Bernacki
   3  * Copyright (c) 2006 Peter Wemm
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * From: FreeBSD: src/lib/libkvm/kvm_minidump_i386.c,v 1.2 2006/06/05 08:51:14
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 /*
  33  * ARM machine dependent routines for kvm and minidumps.
  34  */
  35
  36 #include <sys/endian.h>
  37 #include <sys/param.h>
  38 #include <kvm.h>
  39 #include <limits.h>
  40 #include <stdint.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44
  45 #include "../../sys/arm/include/minidump.h"
  46
  47 #include "kvm_private.h"
  48 #include "kvm_arm.h"
  49
  50 #define arm_round_page(x)       roundup2((kvaddr_t)(x), ARM_PAGE_SIZE)
  51
  52 struct vmstate {
  53         struct          minidumphdr hdr;
  54         void            *ptemap;
  55         unsigned char   ei_data;
  56 };
  57
  58 static int
  59 _arm_minidump_probe(kvm_t *kd)
  60 {
  61
  62         return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) &&
  63             _kvm_is_minidump(kd));
  64 }
  65
  66 static void
  67 _arm_minidump_freevtop(kvm_t *kd)
  68 {
  69         struct vmstate *vm = kd->vmst;
  70
  71         free(vm->ptemap);
  72         free(vm);
  73         kd->vmst = NULL;
  74 }
  75
  76 static int
  77 _arm_minidump_initvtop(kvm_t *kd)
  78 {
  79         struct vmstate *vmst;
  80         off_t off, sparse_off;
  81
  82         vmst = _kvm_malloc(kd, sizeof(*vmst));
  83         if (vmst == NULL) {
  84                 _kvm_err(kd, kd->program, "cannot allocate vm");
  85                 return (-1);
  86         }
  87
  88         kd->vmst = vmst;
  89
  90         if (pread(kd->pmfd, &vmst->hdr,
  91             sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) {
  92                 _kvm_err(kd, kd->program, "cannot read dump header");
  93                 return (-1);
  94         }
  95
  96         if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic,
  97             sizeof(vmst->hdr.magic)) != 0) {
  98                 _kvm_err(kd, kd->program, "not a minidump for this platform");
  99                 return (-1);
 100         }
 101         vmst->hdr.version = _kvm32toh(kd, vmst->hdr.version);
 102         if (vmst->hdr.version != MINIDUMP_VERSION) {
 103                 _kvm_err(kd, kd->program, "wrong minidump version. "
 104                     "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version);
 105                 return (-1);
 106         }
 107         vmst->hdr.msgbufsize = _kvm32toh(kd, vmst->hdr.msgbufsize);
 108         vmst->hdr.bitmapsize = _kvm32toh(kd, vmst->hdr.bitmapsize);
 109         vmst->hdr.ptesize = _kvm32toh(kd, vmst->hdr.ptesize);
 110         vmst->hdr.kernbase = _kvm32toh(kd, vmst->hdr.kernbase);
 111         vmst->hdr.arch = _kvm32toh(kd, vmst->hdr.arch);
 112         vmst->hdr.mmuformat = _kvm32toh(kd, vmst->hdr.mmuformat);
 113         if (vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_UNKNOWN) {
 114                 /* This is a safe default as 1K pages are not used. */
 115                 vmst->hdr.mmuformat = MINIDUMP_MMU_FORMAT_V6;
 116         }
 117
 118         /* Skip header and msgbuf */
 119         off = ARM_PAGE_SIZE + arm_round_page(vmst->hdr.msgbufsize);
 120
 121         sparse_off = off + arm_round_page(vmst->hdr.bitmapsize) +
 122             arm_round_page(vmst->hdr.ptesize);
 123         if (_kvm_pt_init(kd, vmst->hdr.bitmapsize, off, sparse_off,
 124             ARM_PAGE_SIZE, sizeof(uint32_t)) == -1) {
 125                 _kvm_err(kd, kd->program, "cannot load core bitmap");
 126                 return (-1);
 127         }
 128         off += arm_round_page(vmst->hdr.bitmapsize);
 129
 130         vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize);
 131         if (vmst->ptemap == NULL) {
 132                 _kvm_err(kd, kd->program, "cannot allocate %d bytes for "
 133                     "ptemap", vmst->hdr.ptesize);
 134                 return (-1);
 135         }
 136
 137         if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) !=
 138             (ssize_t)vmst->hdr.ptesize) {
 139                 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap",
 140                     vmst->hdr.ptesize);
 141                 return (-1);
 142         }
 143         off += arm_round_page(vmst->hdr.ptesize);
 144
 145         return (0);
 146 }
 147
 148 static int
 149 _arm_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
 150 {
 151         struct vmstate *vm;
 152         arm_pt_entry_t pte;
 153         arm_physaddr_t offset, a;
 154         kvaddr_t pteindex;
 155         off_t ofs;
 156         arm_pt_entry_t *ptemap;
 157
 158         if (ISALIVE(kd)) {
 159                 _kvm_err(kd, 0, "_arm_minidump_kvatop called in live kernel!");
 160                 return (0);
 161         }
 162
 163         vm = kd->vmst;
 164         ptemap = vm->ptemap;
 165
 166         if (va >= vm->hdr.kernbase) {
 167                 pteindex = (va - vm->hdr.kernbase) >> ARM_PAGE_SHIFT;
 168                 if (pteindex >= vm->hdr.ptesize / sizeof(*ptemap))
 169                         goto invalid;
 170                 pte = _kvm32toh(kd, ptemap[pteindex]);
 171                 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV) {
 172                         _kvm_err(kd, kd->program,
 173                             "_arm_minidump_kvatop: pte not valid");
 174                         goto invalid;
 175                 }
 176                 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
 177                         /* 64K page -> convert to be like 4K page */
 178                         offset = va & ARM_L2_S_OFFSET;
 179                         a = (pte & ARM_L2_L_FRAME) +
 180                             (va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME);
 181                 } else {
 182                         if (kd->vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 &&
 183                             (pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) {
 184                                 _kvm_err(kd, kd->program,
 185                                     "_arm_minidump_kvatop: pte not supported");
 186                                 goto invalid;
 187                         }
 188                         /* 4K page */
 189                         offset = va & ARM_L2_S_OFFSET;
 190                         a = pte & ARM_L2_S_FRAME;
 191                 }
 192
 193                 ofs = _kvm_pt_find(kd, a);
 194                 if (ofs == -1) {
 195                         _kvm_err(kd, kd->program, "_arm_minidump_kvatop: "
 196                             "physical address 0x%jx not in minidump",
 197                             (uintmax_t)a);
 198                         goto invalid;
 199                 }
 200
 201                 *pa = ofs + offset;
 202                 return (ARM_PAGE_SIZE - offset);
 203         } else
 204                 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: virtual "
 205                     "address 0x%jx not minidumped", (uintmax_t)va);
 206
 207 invalid:
 208         _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
 209         return (0);
 210 }
 211
 212 struct kvm_arch kvm_arm_minidump = {
 213         .ka_probe = _arm_minidump_probe,
 214         .ka_initvtop = _arm_minidump_initvtop,
 215         .ka_freevtop = _arm_minidump_freevtop,
 216         .ka_kvatop = _arm_minidump_kvatop,
 217         .ka_native = _arm_native,
 218 };
 219
 220 KVM_ARCH(kvm_arm_minidump);