2 * Copyright (c) 2006 Peter Wemm
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
30 * i386 machine dependent routines for kvm and minidumps.
33 #include <sys/param.h>
34 #include <sys/endian.h>
41 #include "../../sys/i386/include/minidump.h"
45 #include "kvm_private.h"
48 #define i386_round_page(x) roundup2((kvaddr_t)(x), I386_PAGE_SIZE)
51 struct minidumphdr hdr;
56 _i386_minidump_probe(kvm_t *kd)
59 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) &&
60 _kvm_is_minidump(kd));
64 _i386_minidump_freevtop(kvm_t *kd)
66 struct vmstate *vm = kd->vmst;
74 _i386_minidump_initvtop(kvm_t *kd)
77 off_t off, sparse_off;
79 vmst = _kvm_malloc(kd, sizeof(*vmst));
81 _kvm_err(kd, kd->program, "cannot allocate vm");
85 if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) !=
87 _kvm_err(kd, kd->program, "cannot read dump header");
90 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) {
91 _kvm_err(kd, kd->program, "not a minidump for this platform");
94 vmst->hdr.version = le32toh(vmst->hdr.version);
95 if (vmst->hdr.version != MINIDUMP_VERSION) {
96 _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d",
97 MINIDUMP_VERSION, vmst->hdr.version);
100 vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize);
101 vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize);
102 vmst->hdr.ptesize = le32toh(vmst->hdr.ptesize);
103 vmst->hdr.kernbase = le32toh(vmst->hdr.kernbase);
104 vmst->hdr.paemode = le32toh(vmst->hdr.paemode);
106 /* Skip header and msgbuf */
107 off = I386_PAGE_SIZE + i386_round_page(vmst->hdr.msgbufsize);
109 sparse_off = off + i386_round_page(vmst->hdr.bitmapsize) +
110 i386_round_page(vmst->hdr.ptesize);
111 if (_kvm_pt_init(kd, vmst->hdr.bitmapsize, off, sparse_off,
112 I386_PAGE_SIZE, sizeof(uint32_t)) == -1) {
113 _kvm_err(kd, kd->program, "cannot load core bitmap");
116 off += i386_round_page(vmst->hdr.bitmapsize);
118 vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize);
119 if (vmst->ptemap == NULL) {
120 _kvm_err(kd, kd->program, "cannot allocate %d bytes for ptemap", vmst->hdr.ptesize);
123 if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) !=
124 (ssize_t)vmst->hdr.ptesize) {
125 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", vmst->hdr.ptesize);
128 off += i386_round_page(vmst->hdr.ptesize);
134 _i386_minidump_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa)
137 i386_physaddr_pae_t offset;
140 i386_physaddr_pae_t a;
142 i386_pte_pae_t *ptemap;
146 offset = va & I386_PAGE_MASK;
148 if (va >= vm->hdr.kernbase) {
149 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT;
150 if (pteindex >= vm->hdr.ptesize / sizeof(*ptemap))
152 pte = le64toh(ptemap[pteindex]);
153 if ((pte & I386_PG_V) == 0) {
154 _kvm_err(kd, kd->program,
155 "_i386_minidump_vatop_pae: pte not valid");
158 a = pte & I386_PG_FRAME_PAE;
159 ofs = _kvm_pt_find(kd, a);
161 _kvm_err(kd, kd->program,
162 "_i386_minidump_vatop_pae: physical address 0x%jx not in minidump",
167 return (I386_PAGE_SIZE - offset);
169 _kvm_err(kd, kd->program,
170 "_i386_minidump_vatop_pae: virtual address 0x%jx not minidumped",
176 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
181 _i386_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
184 i386_physaddr_t offset;
193 offset = va & I386_PAGE_MASK;
195 if (va >= vm->hdr.kernbase) {
196 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT;
197 if (pteindex >= vm->hdr.ptesize / sizeof(*ptemap))
199 pte = le32toh(ptemap[pteindex]);
200 if ((pte & I386_PG_V) == 0) {
201 _kvm_err(kd, kd->program,
202 "_i386_minidump_vatop: pte not valid");
205 a = pte & I386_PG_FRAME;
206 ofs = _kvm_pt_find(kd, a);
208 _kvm_err(kd, kd->program,
209 "_i386_minidump_vatop: physical address 0x%jx not in minidump",
214 return (I386_PAGE_SIZE - offset);
216 _kvm_err(kd, kd->program,
217 "_i386_minidump_vatop: virtual address 0x%jx not minidumped",
223 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
228 _i386_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
232 _kvm_err(kd, 0, "_i386_minidump_kvatop called in live kernel!");
235 if (kd->vmst->hdr.paemode)
236 return (_i386_minidump_vatop_pae(kd, va, pa));
238 return (_i386_minidump_vatop(kd, va, pa));
241 struct kvm_arch kvm_i386_minidump = {
242 .ka_probe = _i386_minidump_probe,
243 .ka_initvtop = _i386_minidump_initvtop,
244 .ka_freevtop = _i386_minidump_freevtop,
245 .ka_kvatop = _i386_minidump_kvatop,
246 .ka_native = _i386_native,
249 KVM_ARCH(kvm_i386_minidump);