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         struct          hpt hpt;
  55         void            *ptemap;
  56         unsigned char   ei_data;
  57 };
  58
  59 static int
  60 _arm_minidump_probe(kvm_t *kd)
  61 {
  62
  63         return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) &&
  64             _kvm_is_minidump(kd));
  65 }
  66
  67 static void
  68 _arm_minidump_freevtop(kvm_t *kd)
  69 {
  70         struct vmstate *vm = kd->vmst;
  71
  72         _kvm_hpt_free(&vm->hpt);
  73         if (vm->ptemap)
  74                 free(vm->ptemap);
  75         free(vm);
  76         kd->vmst = NULL;
  77 }
  78
  79 static int
  80 _arm_minidump_initvtop(kvm_t *kd)
  81 {
  82         struct vmstate *vmst;
  83         uint32_t *bitmap;
  84         off_t off;
  85
  86         vmst = _kvm_malloc(kd, sizeof(*vmst));
  87         if (vmst == NULL) {
  88                 _kvm_err(kd, kd->program, "cannot allocate vm");
  89                 return (-1);
  90         }
  91
  92         kd->vmst = vmst;
  93
  94         if (pread(kd->pmfd, &vmst->hdr,
  95             sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) {
  96                 _kvm_err(kd, kd->program, "cannot read dump header");
  97                 return (-1);
  98         }
  99
 100         if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic,
 101             sizeof(vmst->hdr.magic)) != 0) {
 102                 _kvm_err(kd, kd->program, "not a minidump for this platform");
 103                 return (-1);
 104         }
 105         vmst->hdr.version = _kvm32toh(kd, vmst->hdr.version);
 106         if (vmst->hdr.version != MINIDUMP_VERSION) {
 107                 _kvm_err(kd, kd->program, "wrong minidump version. "
 108                     "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version);
 109                 return (-1);
 110         }
 111         vmst->hdr.msgbufsize = _kvm32toh(kd, vmst->hdr.msgbufsize);
 112         vmst->hdr.bitmapsize = _kvm32toh(kd, vmst->hdr.bitmapsize);
 113         vmst->hdr.ptesize = _kvm32toh(kd, vmst->hdr.ptesize);
 114         vmst->hdr.kernbase = _kvm32toh(kd, vmst->hdr.kernbase);
 115         vmst->hdr.arch = _kvm32toh(kd, vmst->hdr.arch);
 116         vmst->hdr.mmuformat = _kvm32toh(kd, vmst->hdr.mmuformat);
 117         if (vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_UNKNOWN) {
 118                 /* This is a safe default as 1K pages are not used. */
 119                 vmst->hdr.mmuformat = MINIDUMP_MMU_FORMAT_V6;
 120         }
 121
 122         /* Skip header and msgbuf */
 123         off = ARM_PAGE_SIZE + arm_round_page(vmst->hdr.msgbufsize);
 124
 125         bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
 126         if (bitmap == NULL) {
 127                 _kvm_err(kd, kd->program, "cannot allocate %d bytes for "
 128                     "bitmap", vmst->hdr.bitmapsize);
 129                 return (-1);
 130         }
 131
 132         if (pread(kd->pmfd, bitmap, vmst->hdr.bitmapsize, off) !=
 133             (ssize_t)vmst->hdr.bitmapsize) {
 134                 _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap",
 135                     vmst->hdr.bitmapsize);
 136                 free(bitmap);
 137                 return (-1);
 138         }
 139         off += arm_round_page(vmst->hdr.bitmapsize);
 140
 141         vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize);
 142         if (vmst->ptemap == NULL) {
 143                 _kvm_err(kd, kd->program, "cannot allocate %d bytes for "
 144                     "ptemap", vmst->hdr.ptesize);
 145                 free(bitmap);
 146                 return (-1);
 147         }
 148
 149         if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) !=
 150             (ssize_t)vmst->hdr.ptesize) {
 151                 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap",
 152                     vmst->hdr.ptesize);
 153                 free(bitmap);
 154                 return (-1);
 155         }
 156
 157         off += vmst->hdr.ptesize;
 158
 159         /* Build physical address hash table for sparse pages */
 160         _kvm_hpt_init(kd, &vmst->hpt, bitmap, vmst->hdr.bitmapsize, off,
 161             ARM_PAGE_SIZE, sizeof(*bitmap));
 162         free(bitmap);
 163
 164         return (0);
 165 }
 166
 167 static int
 168 _arm_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
 169 {
 170         struct vmstate *vm;
 171         arm_pt_entry_t pte;
 172         arm_physaddr_t offset, a;
 173         kvaddr_t pteindex;
 174         off_t ofs;
 175         arm_pt_entry_t *ptemap;
 176
 177         if (ISALIVE(kd)) {
 178                 _kvm_err(kd, 0, "_arm_minidump_kvatop called in live kernel!");
 179                 return (0);
 180         }
 181
 182         vm = kd->vmst;
 183         ptemap = vm->ptemap;
 184
 185         if (va >= vm->hdr.kernbase) {
 186                 pteindex = (va - vm->hdr.kernbase) >> ARM_PAGE_SHIFT;
 187                 pte = _kvm32toh(kd, ptemap[pteindex]);
 188                 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV) {
 189                         _kvm_err(kd, kd->program,
 190                             "_arm_minidump_kvatop: pte not valid");
 191                         goto invalid;
 192                 }
 193                 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
 194                         /* 64K page -> convert to be like 4K page */
 195                         offset = va & ARM_L2_S_OFFSET;
 196                         a = (pte & ARM_L2_L_FRAME) +
 197                             (va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME);
 198                 } else {
 199                         if (kd->vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 &&
 200                             (pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) {
 201                                 _kvm_err(kd, kd->program,
 202                                     "_arm_minidump_kvatop: pte not supported");
 203                                 goto invalid;
 204                         }
 205                         /* 4K page */
 206                         offset = va & ARM_L2_S_OFFSET;
 207                         a = pte & ARM_L2_S_FRAME;
 208                 }
 209
 210                 ofs = _kvm_hpt_find(&vm->hpt, a);
 211                 if (ofs == -1) {
 212                         _kvm_err(kd, kd->program, "_arm_minidump_kvatop: "
 213                             "physical address 0x%jx not in minidump",
 214                             (uintmax_t)a);
 215                         goto invalid;
 216                 }
 217
 218                 *pa = ofs + offset;
 219                 return (ARM_PAGE_SIZE - offset);
 220         } else
 221                 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: virtual "
 222                     "address 0x%jx not minidumped", (uintmax_t)va);
 223
 224 invalid:
 225         _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
 226         return (0);
 227 }
 228
 229 struct kvm_arch kvm_arm_minidump = {
 230         .ka_probe = _arm_minidump_probe,
 231         .ka_initvtop = _arm_minidump_initvtop,
 232         .ka_freevtop = _arm_minidump_freevtop,
 233         .ka_kvatop = _arm_minidump_kvatop,
 234         .ka_native = _arm_native,
 235 };
 236
 237 KVM_ARCH(kvm_arm_minidump);