1 /*-
2 * Copyright (c) 2006 Peter Wemm
3 * Copyright (c) 2019 Leandro Lupori
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_riscv.c
27 */
28
29 #include <sys/cdefs.h>
30 #include <sys/param.h>
31
32 #include <kvm.h>
33
34 #include <limits.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <unistd.h>
38
39 #include "../../sys/powerpc/include/minidump.h"
40 #include "kvm_private.h"
41 #include "kvm_powerpc64.h"
42
43
44 static int
_powerpc64_minidump_probe(kvm_t * kd)45 _powerpc64_minidump_probe(kvm_t *kd)
46 {
47 return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_PPC64) &&
48 _kvm_is_minidump(kd));
49 }
50
51 static void
_powerpc64_minidump_freevtop(kvm_t * kd)52 _powerpc64_minidump_freevtop(kvm_t *kd)
53 {
54 struct vmstate *vm = kd->vmst;
55
56 if (vm == NULL)
57 return;
58 if (PPC64_MMU_OPS(kd))
59 PPC64_MMU_OP(kd, cleanup);
60 free(vm);
61 kd->vmst = NULL;
62 }
63
64 static int
_powerpc64_minidump_initvtop(kvm_t * kd)65 _powerpc64_minidump_initvtop(kvm_t *kd)
66 {
67 struct vmstate *vmst;
68 struct minidumphdr *hdr;
69 off_t dump_avail_off, bitmap_off, pmap_off, sparse_off;
70 const char *mmu_name;
71
72 /* Alloc VM */
73 vmst = _kvm_malloc(kd, sizeof(*vmst));
74 if (vmst == NULL) {
75 _kvm_err(kd, kd->program, "cannot allocate vm");
76 return (-1);
77 }
78 hdr = &vmst->hdr;
79 kd->vmst = vmst;
80 PPC64_MMU_OPS(kd) = NULL;
81 /* Read minidump header */
82 if (pread(kd->pmfd, hdr, sizeof(*hdr), 0) != sizeof(*hdr)) {
83 _kvm_err(kd, kd->program, "cannot read minidump header");
84 goto failed;
85 }
86 /* Check magic */
87 if (strncmp(MINIDUMP_MAGIC, hdr->magic, sizeof(hdr->magic)) != 0) {
88 _kvm_err(kd, kd->program, "not a minidump for this platform");
89 goto failed;
90 }
91 /* Check version */
92 hdr->version = be32toh(hdr->version);
93 if (hdr->version != MINIDUMP_VERSION && hdr->version != 1) {
94 _kvm_err(kd, kd->program, "wrong minidump version. "
95 "Expected %d got %d", MINIDUMP_VERSION, hdr->version);
96 goto failed;
97 }
98 /* Convert header fields to host endian */
99 hdr->msgbufsize = be32toh(hdr->msgbufsize);
100 hdr->bitmapsize = be32toh(hdr->bitmapsize);
101 hdr->pmapsize = be32toh(hdr->pmapsize);
102 hdr->kernbase = be64toh(hdr->kernbase);
103 hdr->kernend = be64toh(hdr->kernend);
104 hdr->dmapbase = be64toh(hdr->dmapbase);
105 hdr->dmapend = be64toh(hdr->dmapend);
106 hdr->hw_direct_map = be32toh(hdr->hw_direct_map);
107 hdr->startkernel = be64toh(hdr->startkernel);
108 hdr->endkernel = be64toh(hdr->endkernel);
109 hdr->dumpavailsize = hdr->version == MINIDUMP_VERSION ?
110 be32toh(hdr->dumpavailsize) : 0;
111
112 vmst->kimg_start = PPC64_KERNBASE;
113 vmst->kimg_end = PPC64_KERNBASE + hdr->endkernel - hdr->startkernel;
114
115 /* dump header */
116 dprintf("%s: mmu_name=%s,\n\t"
117 "msgbufsize=0x%jx, bitmapsize=0x%jx, pmapsize=0x%jx, "
118 "kernbase=0x%jx, kernend=0x%jx,\n\t"
119 "dmapbase=0x%jx, dmapend=0x%jx, hw_direct_map=%d, "
120 "startkernel=0x%jx, endkernel=0x%jx\n\t"
121 "kimg_start=0x%jx, kimg_end=0x%jx\n",
122 __func__, hdr->mmu_name,
123 (uintmax_t)hdr->msgbufsize,
124 (uintmax_t)hdr->bitmapsize, (uintmax_t)hdr->pmapsize,
125 (uintmax_t)hdr->kernbase, (uintmax_t)hdr->kernend,
126 (uintmax_t)hdr->dmapbase, (uintmax_t)hdr->dmapend,
127 hdr->hw_direct_map, hdr->startkernel, hdr->endkernel,
128 (uintmax_t)vmst->kimg_start, (uintmax_t)vmst->kimg_end);
129
130 /* Detect and initialize MMU */
131 mmu_name = hdr->mmu_name;
132 if (strcmp(mmu_name, PPC64_MMU_G5) == 0 ||
133 strcmp(mmu_name, PPC64_MMU_PHYP) == 0)
134 PPC64_MMU_OPS(kd) = ppc64_mmu_ops_hpt;
135 else {
136 _kvm_err(kd, kd->program, "unsupported MMU: %s", mmu_name);
137 goto failed;
138 }
139 if (PPC64_MMU_OP(kd, init) == -1)
140 goto failed;
141
142 /* Get dump parts' offsets */
143 dump_avail_off = PPC64_PAGE_SIZE + ppc64_round_page(hdr->msgbufsize);
144 bitmap_off = dump_avail_off + ppc64_round_page(hdr->dumpavailsize);
145 pmap_off = bitmap_off + ppc64_round_page(hdr->bitmapsize);
146 sparse_off = pmap_off + ppc64_round_page(hdr->pmapsize);
147
148 /* dump offsets */
149 dprintf("%s: msgbuf_off=0x%jx, bitmap_off=0x%jx, pmap_off=0x%jx, "
150 "sparse_off=0x%jx\n",
151 __func__, (uintmax_t)PPC64_PAGE_SIZE, (uintmax_t)bitmap_off,
152 (uintmax_t)pmap_off, (uintmax_t)sparse_off);
153
154 /* build physical address lookup table for sparse pages */
155 if (_kvm_pt_init(kd, hdr->dumpavailsize, dump_avail_off,
156 hdr->bitmapsize, bitmap_off, sparse_off, PPC64_PAGE_SIZE) == -1)
157 goto failed;
158
159 if (_kvm_pmap_init(kd, hdr->pmapsize, pmap_off) == -1)
160 goto failed;
161 return (0);
162
163 failed:
164 _powerpc64_minidump_freevtop(kd);
165 return (-1);
166 }
167
168 static int
_powerpc64_minidump_kvatop(kvm_t * kd,kvaddr_t va,off_t * pa)169 _powerpc64_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
170 {
171 if (ISALIVE(kd)) {
172 _kvm_err(kd, 0, "%s called in live kernel!", __func__);
173 return (0);
174 }
175 return (PPC64_MMU_OP(kd, kvatop, va, pa));
176 }
177
178 static int
_powerpc64_native(kvm_t * kd __unused)179 _powerpc64_native(kvm_t *kd __unused)
180 {
181 #ifdef __powerpc64__
182 return (1);
183 #else
184 return (0);
185 #endif
186 }
187
188 static kssize_t
_powerpc64_kerndisp(kvm_t * kd)189 _powerpc64_kerndisp(kvm_t *kd)
190 {
191 return (kd->vmst->hdr.startkernel - PPC64_KERNBASE);
192 }
193
194 static int
_powerpc64_minidump_walk_pages(kvm_t * kd,kvm_walk_pages_cb_t * cb,void * arg)195 _powerpc64_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg)
196 {
197 return (PPC64_MMU_OP(kd, walk_pages, cb, arg));
198 }
199
200 static struct kvm_arch kvm_powerpc64_minidump = {
201 .ka_probe = _powerpc64_minidump_probe,
202 .ka_initvtop = _powerpc64_minidump_initvtop,
203 .ka_freevtop = _powerpc64_minidump_freevtop,
204 .ka_kvatop = _powerpc64_minidump_kvatop,
205 .ka_walk_pages = _powerpc64_minidump_walk_pages,
206 .ka_native = _powerpc64_native,
207 .ka_kerndisp = _powerpc64_kerndisp,
208 };
209
210 KVM_ARCH(kvm_powerpc64_minidump);
211