1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software developed by the Computer Systems
8 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
9 * BG 91-66 and contributed to Berkeley.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/endian.h>
37 #include <sys/linker_set.h>
38 #include <gelf.h>
39
40 struct kvm_arch {
41 int (*ka_probe)(kvm_t *);
42 int (*ka_initvtop)(kvm_t *);
43 void (*ka_freevtop)(kvm_t *);
44 int (*ka_kvatop)(kvm_t *, kvaddr_t, off_t *);
45 int (*ka_native)(kvm_t *);
46 int (*ka_walk_pages)(kvm_t *, kvm_walk_pages_cb_t *, void *);
47 kssize_t (*ka_kerndisp)(kvm_t *);
48 };
49
50 #define KVM_ARCH(ka) DATA_SET(kvm_arch, ka)
51
52 struct __kvm {
53 struct kvm_arch *arch;
54 /*
55 * a string to be prepended to error messages
56 * provided for compatibility with sun's interface
57 * if this value is null, errors are saved in errbuf[]
58 */
59 const char *program;
60 char *errp; /* XXX this can probably go away */
61 char errbuf[_POSIX2_LINE_MAX];
62 #define ISALIVE(kd) ((kd)->vmfd >= 0)
63 int pmfd; /* physical memory file (or crashdump) */
64 int vmfd; /* virtual memory file (-1 if crashdump) */
65 int nlfd; /* namelist file (e.g., /kernel) */
66 GElf_Ehdr nlehdr; /* ELF file header for namelist file */
67 int (*resolve_symbol)(const char *, kvaddr_t *);
68 struct kinfo_proc *procbase;
69 char *argspc; /* (dynamic) storage for argv strings */
70 int arglen; /* length of the above */
71 char **argv; /* (dynamic) storage for argv pointers */
72 int argc; /* length of above (not actual # present) */
73 char *argbuf; /* (dynamic) temporary storage */
74 /*
75 * Kernel virtual address translation state. This only gets filled
76 * in for dead kernels; otherwise, the running kernel (i.e. kmem)
77 * will do the translations for us. It could be big, so we
78 * only allocate it if necessary.
79 */
80 struct vmstate *vmst;
81 int rawdump; /* raw dump format */
82 int writable; /* physical memory is writable */
83
84 int vnet_initialized; /* vnet fields set up */
85 kvaddr_t vnet_start; /* start of kernel's vnet region */
86 kvaddr_t vnet_stop; /* stop of kernel's vnet region */
87 kvaddr_t vnet_current; /* vnet we're working with */
88 kvaddr_t vnet_base; /* vnet base of current vnet */
89
90 /*
91 * Dynamic per-CPU kernel memory. We translate symbols, on-demand,
92 * to the data associated with dpcpu_curcpu, set with
93 * kvm_dpcpu_setcpu().
94 */
95 int dpcpu_initialized; /* dpcpu fields set up */
96 kvaddr_t dpcpu_start; /* start of kernel's dpcpu region */
97 kvaddr_t dpcpu_stop; /* stop of kernel's dpcpu region */
98 u_int dpcpu_maxcpus; /* size of base array */
99 uintptr_t *dpcpu_off; /* base array, indexed by CPU ID */
100 u_int dpcpu_curcpu; /* CPU we're currently working with */
101 kvaddr_t dpcpu_curoff; /* dpcpu base of current CPU */
102
103 /* Page table lookup structures. */
104 uint64_t *pt_map;
105 size_t pt_map_size;
106 uint64_t *dump_avail; /* actually word sized */
107 size_t dump_avail_size;
108 off_t pt_sparse_off;
109 uint64_t pt_sparse_size;
110 uint32_t *pt_popcounts;
111 unsigned int pt_page_size;
112
113 /* Page & sparse map structures. */
114 void *page_map;
115 uint32_t page_map_size;
116 off_t page_map_off;
117 void *sparse_map;
118 };
119
120 struct kvm_bitmap {
121 uint8_t *map;
122 u_long size;
123 };
124
125 /* Page table lookup constants. */
126 #define POPCOUNT_BITS 1024
127 #define BITS_IN(v) (sizeof(v) * NBBY)
128 #define POPCOUNTS_IN(v) (POPCOUNT_BITS / BITS_IN(v))
129
130 /*
131 * Functions used internally by kvm, but across kvm modules.
132 */
133 static inline uint16_t
_kvm16toh(kvm_t * kd,uint16_t val)134 _kvm16toh(kvm_t *kd, uint16_t val)
135 {
136
137 if (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB)
138 return (le16toh(val));
139 else
140 return (be16toh(val));
141 }
142
143 static inline uint32_t
_kvm32toh(kvm_t * kd,uint32_t val)144 _kvm32toh(kvm_t *kd, uint32_t val)
145 {
146
147 if (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB)
148 return (le32toh(val));
149 else
150 return (be32toh(val));
151 }
152
153 static inline uint64_t
_kvm64toh(kvm_t * kd,uint64_t val)154 _kvm64toh(kvm_t *kd, uint64_t val)
155 {
156
157 if (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB)
158 return (le64toh(val));
159 else
160 return (be64toh(val));
161 }
162
163 uint64_t _kvm_pa_bit_id(kvm_t *kd, uint64_t pa, unsigned int page_size);
164 uint64_t _kvm_bit_id_pa(kvm_t *kd, uint64_t bit_id, unsigned int page_size);
165 #define _KVM_PA_INVALID ULONG_MAX
166 #define _KVM_BIT_ID_INVALID ULONG_MAX
167
168 int _kvm_bitmap_init(struct kvm_bitmap *, u_long, u_long *);
169 void _kvm_bitmap_set(struct kvm_bitmap *, u_long);
170 int _kvm_bitmap_next(struct kvm_bitmap *, u_long *);
171 void _kvm_bitmap_deinit(struct kvm_bitmap *);
172
173 void _kvm_err(kvm_t *kd, const char *program, const char *fmt, ...)
174 __printflike(3, 4);
175 void _kvm_freeprocs(kvm_t *kd);
176 void *_kvm_malloc(kvm_t *kd, size_t);
177 int _kvm_nlist(kvm_t *, struct kvm_nlist *, int);
178 void *_kvm_realloc(kvm_t *kd, void *, size_t);
179 void _kvm_syserr (kvm_t *kd, const char *program, const char *fmt, ...)
180 __printflike(3, 4);
181 int _kvm_vnet_selectpid(kvm_t *, pid_t);
182 int _kvm_vnet_initialized(kvm_t *, int);
183 kvaddr_t _kvm_vnet_validaddr(kvm_t *, kvaddr_t);
184 int _kvm_dpcpu_initialized(kvm_t *, int);
185 kvaddr_t _kvm_dpcpu_validaddr(kvm_t *, kvaddr_t);
186 int _kvm_probe_elf_kernel(kvm_t *, int, int);
187 int _kvm_is_minidump(kvm_t *);
188 int _kvm_read_core_phdrs(kvm_t *, size_t *, GElf_Phdr **);
189 int _kvm_pt_init(kvm_t *, size_t, off_t, size_t, off_t, off_t, int);
190 off_t _kvm_pt_find(kvm_t *, uint64_t, unsigned int);
191 int _kvm_visit_cb(kvm_t *, kvm_walk_pages_cb_t *, void *, u_long,
192 u_long, u_long, vm_prot_t, size_t, unsigned int);
193 int _kvm_pmap_init(kvm_t *, uint32_t, off_t);
194 void * _kvm_pmap_get(kvm_t *, u_long, size_t);
195 void * _kvm_map_get(kvm_t *, u_long, unsigned int);
196