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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         void            *ptemap;
55         unsigned char   ei_data;
56 };
57
58 static int
59 _arm_minidump_probe(kvm_t *kd)
60 {
61
62         return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) &&
63             _kvm_is_minidump(kd));
64 }
65
66 static void
67 _arm_minidump_freevtop(kvm_t *kd)
68 {
69         struct vmstate *vm = kd->vmst;
70
71         free(vm->ptemap);
72         free(vm);
73         kd->vmst = NULL;
74 }
75
76 static int
77 _arm_minidump_initvtop(kvm_t *kd)
78 {
79         struct vmstate *vmst;
80         off_t off, sparse_off;
81
82         vmst = _kvm_malloc(kd, sizeof(*vmst));
83         if (vmst == NULL) {
84                 _kvm_err(kd, kd->program, "cannot allocate vm");
85                 return (-1);
86         }
87
88         kd->vmst = vmst;
89
90         if (pread(kd->pmfd, &vmst->hdr,
91             sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) {
92                 _kvm_err(kd, kd->program, "cannot read dump header");
93                 return (-1);
94         }
95
96         if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic,
97             sizeof(vmst->hdr.magic)) != 0) {
98                 _kvm_err(kd, kd->program, "not a minidump for this platform");
99                 return (-1);
100         }
101         vmst->hdr.version = _kvm32toh(kd, vmst->hdr.version);
102         if (vmst->hdr.version != MINIDUMP_VERSION) {
103                 _kvm_err(kd, kd->program, "wrong minidump version. "
104                     "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version);
105                 return (-1);
106         }
107         vmst->hdr.msgbufsize = _kvm32toh(kd, vmst->hdr.msgbufsize);
108         vmst->hdr.bitmapsize = _kvm32toh(kd, vmst->hdr.bitmapsize);
109         vmst->hdr.ptesize = _kvm32toh(kd, vmst->hdr.ptesize);
110         vmst->hdr.kernbase = _kvm32toh(kd, vmst->hdr.kernbase);
111         vmst->hdr.arch = _kvm32toh(kd, vmst->hdr.arch);
112         vmst->hdr.mmuformat = _kvm32toh(kd, vmst->hdr.mmuformat);
113         if (vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_UNKNOWN) {
114                 /* This is a safe default as 1K pages are not used. */
115                 vmst->hdr.mmuformat = MINIDUMP_MMU_FORMAT_V6;
116         }
117
118         /* Skip header and msgbuf */
119         off = ARM_PAGE_SIZE + arm_round_page(vmst->hdr.msgbufsize);
120
121         sparse_off = off + arm_round_page(vmst->hdr.bitmapsize) +
122             arm_round_page(vmst->hdr.ptesize);
123         if (_kvm_pt_init(kd, vmst->hdr.bitmapsize, off, sparse_off,
124             ARM_PAGE_SIZE, sizeof(uint32_t)) == -1) {
125                 _kvm_err(kd, kd->program, "cannot load core bitmap");
126                 return (-1);
127         }
128         off += arm_round_page(vmst->hdr.bitmapsize);
129
130         vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize);
131         if (vmst->ptemap == NULL) {
132                 _kvm_err(kd, kd->program, "cannot allocate %d bytes for "
133                     "ptemap", vmst->hdr.ptesize);
134                 return (-1);
135         }
136
137         if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) !=
138             (ssize_t)vmst->hdr.ptesize) {
139                 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap",
140                     vmst->hdr.ptesize);
141                 return (-1);
142         }
143         off += arm_round_page(vmst->hdr.ptesize);
144
145         return (0);
146 }
147
148 static int
149 _arm_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
150 {
151         struct vmstate *vm;
152         arm_pt_entry_t pte;
153         arm_physaddr_t offset, a;
154         kvaddr_t pteindex;
155         off_t ofs;
156         arm_pt_entry_t *ptemap;
157
158         if (ISALIVE(kd)) {
159                 _kvm_err(kd, 0, "_arm_minidump_kvatop called in live kernel!");
160                 return (0);
161         }
162
163         vm = kd->vmst;
164         ptemap = vm->ptemap;
165
166         if (va >= vm->hdr.kernbase) {
167                 pteindex = (va - vm->hdr.kernbase) >> ARM_PAGE_SHIFT;
168                 if (pteindex >= vm->hdr.ptesize / sizeof(*ptemap))
169                         goto invalid;
170                 pte = _kvm32toh(kd, ptemap[pteindex]);
171                 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV) {
172                         _kvm_err(kd, kd->program,
173                             "_arm_minidump_kvatop: pte not valid");
174                         goto invalid;
175                 }
176                 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
177                         /* 64K page -> convert to be like 4K page */
178                         offset = va & ARM_L2_S_OFFSET;
179                         a = (pte & ARM_L2_L_FRAME) +
180                             (va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME);
181                 } else {
182                         if (kd->vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 &&
183                             (pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) {
184                                 _kvm_err(kd, kd->program,
185                                     "_arm_minidump_kvatop: pte not supported");
186                                 goto invalid;
187                         }
188                         /* 4K page */
189                         offset = va & ARM_L2_S_OFFSET;
190                         a = pte & ARM_L2_S_FRAME;
191                 }
192
193                 ofs = _kvm_pt_find(kd, a);
194                 if (ofs == -1) {
195                         _kvm_err(kd, kd->program, "_arm_minidump_kvatop: "
196                             "physical address 0x%jx not in minidump",
197                             (uintmax_t)a);
198                         goto invalid;
199                 }
200
201                 *pa = ofs + offset;
202                 return (ARM_PAGE_SIZE - offset);
203         } else
204                 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: virtual "
205                     "address 0x%jx not minidumped", (uintmax_t)va);
206
207 invalid:
208         _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
209         return (0);
210 }
211
212 static struct kvm_arch kvm_arm_minidump = {
213         .ka_probe = _arm_minidump_probe,
214         .ka_initvtop = _arm_minidump_initvtop,
215         .ka_freevtop = _arm_minidump_freevtop,
216         .ka_kvatop = _arm_minidump_kvatop,
217         .ka_native = _arm_native,
218 };
219
220 KVM_ARCH(kvm_arm_minidump);