2 * Copyright (c) 2008, Juniper Networks, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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 * 3. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/endian.h>
34 #include <sys/kerneldump.h>
45 #include "kvm_private.h"
56 valid_elf_header(Elf32_Ehdr *eh)
61 if (eh->e_ident[EI_CLASS] != ELFCLASS32)
63 if (eh->e_ident[EI_DATA] != ELFDATA2MSB)
65 if (eh->e_ident[EI_VERSION] != EV_CURRENT)
67 if (eh->e_ident[EI_OSABI] != ELFOSABI_STANDALONE)
69 if (be16toh(eh->e_type) != ET_CORE)
71 if (be16toh(eh->e_machine) != EM_PPC)
73 /* Can't think of anything else to check... */
78 dump_header_size(struct kerneldumpheader *dh)
81 if (strcmp(dh->magic, KERNELDUMPMAGIC) != 0)
83 if (strcmp(dh->architecture, "powerpc") != 0)
85 /* That should do it... */
90 * Map the ELF headers into the process' address space. We do this in two
91 * steps: first the ELF header itself and using that information the whole
95 powerpc_maphdrs(kvm_t *kd)
102 vm->mapsz = PAGE_SIZE;
103 vm->map = mmap(NULL, vm->mapsz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
104 if (vm->map == MAP_FAILED) {
105 _kvm_err(kd, kd->program, "cannot map corefile");
110 if (!valid_elf_header(vm->eh)) {
112 * Hmmm, no ELF header. Maybe we still have a dump header.
113 * This is normal when the core file wasn't created by
114 * savecore(8), but instead was dumped over TFTP. We can
115 * easily skip the dump header...
117 vm->dmphdrsz = dump_header_size(vm->map);
118 if (vm->dmphdrsz == 0)
120 vm->eh = (void *)((uintptr_t)vm->map + vm->dmphdrsz);
121 if (!valid_elf_header(vm->eh))
124 mapsz = be16toh(vm->eh->e_phentsize) * be16toh(vm->eh->e_phnum) +
125 be32toh(vm->eh->e_phoff);
126 munmap(vm->map, vm->mapsz);
128 /* Map all headers. */
129 vm->mapsz = vm->dmphdrsz + mapsz;
130 vm->map = mmap(NULL, vm->mapsz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
131 if (vm->map == MAP_FAILED) {
132 _kvm_err(kd, kd->program, "cannot map corefle headers");
135 vm->eh = (void *)((uintptr_t)vm->map + vm->dmphdrsz);
136 vm->ph = (void *)((uintptr_t)vm->eh + be32toh(vm->eh->e_phoff));
140 munmap(vm->map, vm->mapsz);
141 vm->map = MAP_FAILED;
142 _kvm_err(kd, kd->program, "invalid corefile");
147 * Determine the offset within the corefile corresponding the virtual
148 * address. Return the number of contiguous bytes in the corefile or
149 * 0 when the virtual address is invalid.
152 powerpc_va2off(kvm_t *kd, u_long va, off_t *ofs)
154 struct vmstate *vm = kd->vmst;
159 nph = be16toh(vm->eh->e_phnum);
160 while (nph && (va < be32toh(ph->p_vaddr) ||
161 va >= be32toh(ph->p_vaddr) + be32toh(ph->p_memsz))) {
163 ph = (void *)((uintptr_t)ph + be16toh(vm->eh->e_phentsize));
168 /* Segment found. Return file offset and range. */
169 *ofs = vm->dmphdrsz + be32toh(ph->p_offset) +
170 (va - be32toh(ph->p_vaddr));
171 return (be32toh(ph->p_memsz) - (va - be32toh(ph->p_vaddr)));
175 _kvm_freevtop(kvm_t *kd)
177 struct vmstate *vm = kd->vmst;
182 if (vm->eh != MAP_FAILED) {
183 munmap(vm->eh, vm->mapsz);
191 _kvm_initvtop(kvm_t *kd)
194 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
195 if (kd->vmst == NULL) {
196 _kvm_err(kd, kd->program, "out of virtual memory");
199 if (powerpc_maphdrs(kd) == -1) {
208 _kvm_kvatop(kvm_t *kd, u_long va, off_t *ofs)
213 if (vm->ph->p_paddr == ~0U)
214 return ((int)powerpc_va2off(kd, va, ofs));
216 _kvm_err(kd, kd->program, "Raw corefile not supported");