1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*-
* Copyright (c) 2008, Juniper Networks, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/endian.h>
#include <sys/kerneldump.h>
#include <sys/mman.h>
#include <vm/vm.h>
#include <db.h>
#include <elf.h>
#include <limits.h>
#include <kvm.h>
#include <stdlib.h>
#include <string.h>
#include "kvm_private.h"
struct vmstate {
void *map;
size_t mapsz;
size_t dmphdrsz;
Elf64_Ehdr *eh;
Elf64_Phdr *ph;
};
static int
valid_elf_header(Elf64_Ehdr *eh)
{
if (!IS_ELF(*eh))
return (0);
if (eh->e_ident[EI_CLASS] != ELFCLASS64)
return (0);
if (eh->e_ident[EI_DATA] != ELFDATA2MSB)
return (0);
if (eh->e_ident[EI_VERSION] != EV_CURRENT)
return (0);
if (eh->e_ident[EI_OSABI] != ELFOSABI_STANDALONE)
return (0);
if (be16toh(eh->e_type) != ET_CORE)
return (0);
if (be16toh(eh->e_machine) != EM_PPC64)
return (0);
/* Can't think of anything else to check... */
return (1);
}
static size_t
dump_header_size(struct kerneldumpheader *dh)
{
if (strcmp(dh->magic, KERNELDUMPMAGIC) != 0)
return (0);
if (strcmp(dh->architecture, "powerpc64") != 0)
return (0);
/* That should do it... */
return (sizeof(*dh));
}
/*
* Map the ELF headers into the process' address space. We do this in two
* steps: first the ELF header itself and using that information the whole
* set of headers.
*/
static int
powerpc_maphdrs(kvm_t *kd)
{
struct vmstate *vm;
size_t mapsz;
vm = kd->vmst;
vm->mapsz = PAGE_SIZE;
vm->map = mmap(NULL, vm->mapsz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
if (vm->map == MAP_FAILED) {
_kvm_err(kd, kd->program, "cannot map corefile");
return (-1);
}
vm->dmphdrsz = 0;
vm->eh = vm->map;
if (!valid_elf_header(vm->eh)) {
/*
* Hmmm, no ELF header. Maybe we still have a dump header.
* This is normal when the core file wasn't created by
* savecore(8), but instead was dumped over TFTP. We can
* easily skip the dump header...
*/
vm->dmphdrsz = dump_header_size(vm->map);
if (vm->dmphdrsz == 0)
goto inval;
vm->eh = (void *)((uintptr_t)vm->map + vm->dmphdrsz);
if (!valid_elf_header(vm->eh))
goto inval;
}
mapsz = be16toh(vm->eh->e_phentsize) * be16toh(vm->eh->e_phnum) +
be64toh(vm->eh->e_phoff);
munmap(vm->map, vm->mapsz);
/* Map all headers. */
vm->mapsz = vm->dmphdrsz + mapsz;
vm->map = mmap(NULL, vm->mapsz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
if (vm->map == MAP_FAILED) {
_kvm_err(kd, kd->program, "cannot map corefle headers");
return (-1);
}
vm->eh = (void *)((uintptr_t)vm->map + vm->dmphdrsz);
vm->ph = (void *)((uintptr_t)vm->eh + be64toh(vm->eh->e_phoff));
return (0);
inval:
munmap(vm->map, vm->mapsz);
vm->map = MAP_FAILED;
_kvm_err(kd, kd->program, "invalid corefile");
return (-1);
}
/*
* Determine the offset within the corefile corresponding the virtual
* address. Return the number of contiguous bytes in the corefile or
* 0 when the virtual address is invalid.
*/
static size_t
powerpc64_va2off(kvm_t *kd, u_long va, off_t *ofs)
{
struct vmstate *vm = kd->vmst;
Elf64_Phdr *ph;
int nph;
ph = vm->ph;
nph = be16toh(vm->eh->e_phnum);
while (nph && (va < be64toh(ph->p_vaddr) ||
va >= be64toh(ph->p_vaddr) + be64toh(ph->p_memsz))) {
nph--;
ph = (void *)((uintptr_t)ph + be16toh(vm->eh->e_phentsize));
}
if (nph == 0)
return (0);
/* Segment found. Return file offset and range. */
*ofs = vm->dmphdrsz + be64toh(ph->p_offset) +
(va - be64toh(ph->p_vaddr));
return (be64toh(ph->p_memsz) - (va - be64toh(ph->p_vaddr)));
}
void
_kvm_freevtop(kvm_t *kd)
{
struct vmstate *vm = kd->vmst;
if (vm == NULL)
return;
if (vm->eh != MAP_FAILED) {
munmap(vm->eh, vm->mapsz);
vm->eh = MAP_FAILED;
}
free(vm);
kd->vmst = NULL;
}
int
_kvm_initvtop(kvm_t *kd)
{
kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
if (kd->vmst == NULL) {
_kvm_err(kd, kd->program, "out of virtual memory");
return (-1);
}
if (powerpc_maphdrs(kd) == -1) {
free(kd->vmst);
kd->vmst = NULL;
return (-1);
}
return (0);
}
int
_kvm_kvatop(kvm_t *kd, u_long va, off_t *ofs)
{
struct vmstate *vm;
vm = kd->vmst;
if (vm->ph->p_paddr == ~0UL)
return ((int)powerpc64_va2off(kd, va, ofs));
_kvm_err(kd, kd->program, "Raw corefile not supported");
return (0);
}
|
