1 /*-
2 * Copyright (c) 2008 Semihalf, Grzegorz Bernacki
3 * Copyright (c) 2006 Peter Wemm
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_i386.c,v 1.2 2006/06/05 08:51:14
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 /*
33 * ARM machine dependent routines for kvm and minidumps.
34 */
35
36 #include <sys/endian.h>
37 #include <sys/param.h>
38 #include <kvm.h>
39 #include <limits.h>
40 #include <stdint.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44
45 #include "../../sys/arm/include/minidump.h"
46
47 #include "kvm_private.h"
48 #include "kvm_arm.h"
49
50 #define arm_round_page(x) roundup2((kvaddr_t)(x), ARM_PAGE_SIZE)
51
52 struct vmstate {
53 struct minidumphdr hdr;
54 struct hpt hpt;
55 void *ptemap;
56 unsigned char ei_data;
57 };
58
59 static int
_arm_minidump_probe(kvm_t * kd)60 _arm_minidump_probe(kvm_t *kd)
61 {
62
63 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) &&
64 _kvm_is_minidump(kd));
65 }
66
67 static void
_arm_minidump_freevtop(kvm_t * kd)68 _arm_minidump_freevtop(kvm_t *kd)
69 {
70 struct vmstate *vm = kd->vmst;
71
72 _kvm_hpt_free(&vm->hpt);
73 if (vm->ptemap)
74 free(vm->ptemap);
75 free(vm);
76 kd->vmst = NULL;
77 }
78
79 static int
_arm_minidump_initvtop(kvm_t * kd)80 _arm_minidump_initvtop(kvm_t *kd)
81 {
82 struct vmstate *vmst;
83 uint32_t *bitmap;
84 off_t off;
85
86 vmst = _kvm_malloc(kd, sizeof(*vmst));
87 if (vmst == 0) {
88 _kvm_err(kd, kd->program, "cannot allocate vm");
89 return (-1);
90 }
91
92 kd->vmst = vmst;
93
94 if (pread(kd->pmfd, &vmst->hdr,
95 sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) {
96 _kvm_err(kd, kd->program, "cannot read dump header");
97 return (-1);
98 }
99
100 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic,
101 sizeof(vmst->hdr.magic)) != 0) {
102 _kvm_err(kd, kd->program, "not a minidump for this platform");
103 return (-1);
104 }
105 vmst->hdr.version = _kvm32toh(kd, vmst->hdr.version);
106 if (vmst->hdr.version != MINIDUMP_VERSION) {
107 _kvm_err(kd, kd->program, "wrong minidump version. "
108 "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version);
109 return (-1);
110 }
111 vmst->hdr.msgbufsize = _kvm32toh(kd, vmst->hdr.msgbufsize);
112 vmst->hdr.bitmapsize = _kvm32toh(kd, vmst->hdr.bitmapsize);
113 vmst->hdr.ptesize = _kvm32toh(kd, vmst->hdr.ptesize);
114 vmst->hdr.kernbase = _kvm32toh(kd, vmst->hdr.kernbase);
115
116 /* Skip header and msgbuf */
117 off = ARM_PAGE_SIZE + arm_round_page(vmst->hdr.msgbufsize);
118
119 bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
120 if (bitmap == NULL) {
121 _kvm_err(kd, kd->program, "cannot allocate %d bytes for "
122 "bitmap", vmst->hdr.bitmapsize);
123 return (-1);
124 }
125
126 if (pread(kd->pmfd, bitmap, vmst->hdr.bitmapsize, off) !=
127 (ssize_t)vmst->hdr.bitmapsize) {
128 _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap",
129 vmst->hdr.bitmapsize);
130 free(bitmap);
131 return (-1);
132 }
133 off += arm_round_page(vmst->hdr.bitmapsize);
134
135 vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize);
136 if (vmst->ptemap == NULL) {
137 _kvm_err(kd, kd->program, "cannot allocate %d bytes for "
138 "ptemap", vmst->hdr.ptesize);
139 free(bitmap);
140 return (-1);
141 }
142
143 if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) !=
144 (ssize_t)vmst->hdr.ptesize) {
145 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap",
146 vmst->hdr.ptesize);
147 free(bitmap);
148 return (-1);
149 }
150
151 off += vmst->hdr.ptesize;
152
153 /* Build physical address hash table for sparse pages */
154 _kvm_hpt_init(kd, &vmst->hpt, bitmap, vmst->hdr.bitmapsize, off,
155 ARM_PAGE_SIZE, sizeof(*bitmap));
156 free(bitmap);
157
158 return (0);
159 }
160
161 static int
_arm_minidump_kvatop(kvm_t * kd,kvaddr_t va,off_t * pa)162 _arm_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
163 {
164 struct vmstate *vm;
165 arm_pt_entry_t pte;
166 arm_physaddr_t offset, a;
167 kvaddr_t pteindex;
168 off_t ofs;
169 arm_pt_entry_t *ptemap;
170
171 if (ISALIVE(kd)) {
172 _kvm_err(kd, 0, "_arm_minidump_kvatop called in live kernel!");
173 return (0);
174 }
175
176 vm = kd->vmst;
177 ptemap = vm->ptemap;
178
179 if (va >= vm->hdr.kernbase) {
180 pteindex = (va - vm->hdr.kernbase) >> ARM_PAGE_SHIFT;
181 pte = _kvm32toh(kd, ptemap[pteindex]);
182 if (!pte) {
183 _kvm_err(kd, kd->program,
184 "_arm_minidump_kvatop: pte not valid");
185 goto invalid;
186 }
187 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
188 offset = va & ARM_L2_L_OFFSET;
189 a = pte & ARM_L2_L_FRAME;
190 } else if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_S) {
191 offset = va & ARM_L2_S_OFFSET;
192 a = pte & ARM_L2_S_FRAME;
193 } else
194 goto invalid;
195
196 ofs = _kvm_hpt_find(&vm->hpt, a);
197 if (ofs == -1) {
198 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: "
199 "physical address 0x%jx not in minidump",
200 (uintmax_t)a);
201 goto invalid;
202 }
203
204 *pa = ofs + offset;
205 return (ARM_PAGE_SIZE - offset);
206
207 } else
208 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: virtual "
209 "address 0x%jx not minidumped", (uintmax_t)va);
210
211 invalid:
212 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
213 return (0);
214 }
215
216 struct kvm_arch kvm_arm_minidump = {
217 .ka_probe = _arm_minidump_probe,
218 .ka_initvtop = _arm_minidump_initvtop,
219 .ka_freevtop = _arm_minidump_freevtop,
220 .ka_kvatop = _arm_minidump_kvatop,
221 .ka_native = _arm_native,
222 };
223
224 KVM_ARCH(kvm_arm_minidump);
225