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