1#include <linux/compiler.h>
2#include <linux/rbtree.h>
3#include <string.h>
4#include "map.h"
5#include "symbol.h"
6#include "util.h"
7#include "tests.h"
8#include "debug.h"
9#include "machine.h"
10
11#define UM(x) kallsyms_map->unmap_ip(kallsyms_map, (x))
12
13int test__vmlinux_matches_kallsyms(int subtest __maybe_unused)
14{
15 int err = -1;
16 struct rb_node *nd;
17 struct symbol *sym;
18 struct map *kallsyms_map, *vmlinux_map, *map;
19 struct machine kallsyms, vmlinux;
20 enum map_type type = MAP__FUNCTION;
21 struct maps *maps = &vmlinux.kmaps.maps[type];
22 u64 mem_start, mem_end;
23 bool header_printed;
24
25
26
27
28
29
30
31 machine__init(&kallsyms, "", HOST_KERNEL_ID);
32 machine__init(&vmlinux, "", HOST_KERNEL_ID);
33
34
35
36
37
38
39
40
41 if (machine__create_kernel_maps(&kallsyms) < 0) {
42 pr_debug("machine__create_kernel_maps ");
43 goto out;
44 }
45
46
47
48
49
50
51
52
53
54
55
56
57 if (__machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, true) <= 0) {
58 pr_debug("dso__load_kallsyms ");
59 goto out;
60 }
61
62
63
64
65
66
67
68
69
70 kallsyms_map = machine__kernel_map(&kallsyms);
71
72
73
74
75
76
77 if (machine__create_kernel_maps(&vmlinux) < 0) {
78 pr_debug("machine__create_kernel_maps ");
79 goto out;
80 }
81
82 vmlinux_map = machine__kernel_map(&vmlinux);
83
84
85
86
87
88
89
90
91
92
93
94
95 if (machine__load_vmlinux_path(&vmlinux, type) <= 0) {
96 pr_debug("Couldn't find a vmlinux that matches the kernel running on this machine, skipping test\n");
97 err = TEST_SKIP;
98 goto out;
99 }
100
101 err = 0;
102
103
104
105
106
107
108
109 for (nd = rb_first(&vmlinux_map->dso->symbols[type]); nd; nd = rb_next(nd)) {
110 struct symbol *pair, *first_pair;
111
112 sym = rb_entry(nd, struct symbol, rb_node);
113
114 if (sym->start == sym->end)
115 continue;
116
117 mem_start = vmlinux_map->unmap_ip(vmlinux_map, sym->start);
118 mem_end = vmlinux_map->unmap_ip(vmlinux_map, sym->end);
119
120 first_pair = machine__find_kernel_symbol(&kallsyms, type,
121 mem_start, NULL);
122 pair = first_pair;
123
124 if (pair && UM(pair->start) == mem_start) {
125next_pair:
126 if (strcmp(sym->name, pair->name) == 0) {
127
128
129
130
131
132
133
134
135
136 s64 skew = mem_end - UM(pair->end);
137 if (llabs(skew) >= page_size)
138 pr_debug("WARN: %#" PRIx64 ": diff end addr for %s v: %#" PRIx64 " k: %#" PRIx64 "\n",
139 mem_start, sym->name, mem_end,
140 UM(pair->end));
141
142
143
144
145
146
147
148 continue;
149 } else {
150 pair = machine__find_kernel_symbol_by_name(&kallsyms, type, sym->name, NULL);
151 if (pair) {
152 if (UM(pair->start) == mem_start)
153 goto next_pair;
154
155 pr_debug("WARN: %#" PRIx64 ": diff name v: %s k: %s\n",
156 mem_start, sym->name, pair->name);
157 } else {
158 pr_debug("WARN: %#" PRIx64 ": diff name v: %s k: %s\n",
159 mem_start, sym->name, first_pair->name);
160 }
161
162 continue;
163 }
164 } else
165 pr_debug("ERR : %#" PRIx64 ": %s not on kallsyms\n",
166 mem_start, sym->name);
167
168 err = -1;
169 }
170
171 if (!verbose)
172 goto out;
173
174 header_printed = false;
175
176 for (map = maps__first(maps); map; map = map__next(map)) {
177 struct map *
178
179
180
181
182
183
184 pair = map_groups__find_by_name(&kallsyms.kmaps, type,
185 (map->dso->kernel ?
186 map->dso->short_name :
187 map->dso->name));
188 if (pair) {
189 pair->priv = 1;
190 } else {
191 if (!header_printed) {
192 pr_info("WARN: Maps only in vmlinux:\n");
193 header_printed = true;
194 }
195 map__fprintf(map, stderr);
196 }
197 }
198
199 header_printed = false;
200
201 for (map = maps__first(maps); map; map = map__next(map)) {
202 struct map *pair;
203
204 mem_start = vmlinux_map->unmap_ip(vmlinux_map, map->start);
205 mem_end = vmlinux_map->unmap_ip(vmlinux_map, map->end);
206
207 pair = map_groups__find(&kallsyms.kmaps, type, mem_start);
208 if (pair == NULL || pair->priv)
209 continue;
210
211 if (pair->start == mem_start) {
212 if (!header_printed) {
213 pr_info("WARN: Maps in vmlinux with a different name in kallsyms:\n");
214 header_printed = true;
215 }
216
217 pr_info("WARN: %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s in kallsyms as",
218 map->start, map->end, map->pgoff, map->dso->name);
219 if (mem_end != pair->end)
220 pr_info(":\nWARN: *%" PRIx64 "-%" PRIx64 " %" PRIx64,
221 pair->start, pair->end, pair->pgoff);
222 pr_info(" %s\n", pair->dso->name);
223 pair->priv = 1;
224 }
225 }
226
227 header_printed = false;
228
229 maps = &kallsyms.kmaps.maps[type];
230
231 for (map = maps__first(maps); map; map = map__next(map)) {
232 if (!map->priv) {
233 if (!header_printed) {
234 pr_info("WARN: Maps only in kallsyms:\n");
235 header_printed = true;
236 }
237 map__fprintf(map, stderr);
238 }
239 }
240out:
241 machine__exit(&kallsyms);
242 machine__exit(&vmlinux);
243 return err;
244}
245