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0a4e1ae6 JO |
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 | static int vmlinux_matches_kallsyms_filter(struct map *map __maybe_unused, | |
12 | struct symbol *sym) | |
13 | { | |
14 | bool *visited = symbol__priv(sym); | |
15 | *visited = true; | |
16 | return 0; | |
17 | } | |
18 | ||
82e75d00 AH |
19 | #define UM(x) kallsyms_map->unmap_ip(kallsyms_map, (x)) |
20 | ||
721a1f53 | 21 | int test__vmlinux_matches_kallsyms(int subtest __maybe_unused) |
0a4e1ae6 JO |
22 | { |
23 | int err = -1; | |
24 | struct rb_node *nd; | |
25 | struct symbol *sym; | |
4bb7123d | 26 | struct map *kallsyms_map, *vmlinux_map, *map; |
0a4e1ae6 JO |
27 | struct machine kallsyms, vmlinux; |
28 | enum map_type type = MAP__FUNCTION; | |
1eee78ae | 29 | struct maps *maps = &vmlinux.kmaps.maps[type]; |
d380b348 | 30 | u64 mem_start, mem_end; |
0a4e1ae6 JO |
31 | |
32 | /* | |
33 | * Step 1: | |
34 | * | |
35 | * Init the machines that will hold kernel, modules obtained from | |
36 | * both vmlinux + .ko files and from /proc/kallsyms split by modules. | |
37 | */ | |
38 | machine__init(&kallsyms, "", HOST_KERNEL_ID); | |
39 | machine__init(&vmlinux, "", HOST_KERNEL_ID); | |
40 | ||
41 | /* | |
42 | * Step 2: | |
43 | * | |
44 | * Create the kernel maps for kallsyms and the DSO where we will then | |
45 | * load /proc/kallsyms. Also create the modules maps from /proc/modules | |
46 | * and find the .ko files that match them in /lib/modules/`uname -r`/. | |
47 | */ | |
48 | if (machine__create_kernel_maps(&kallsyms) < 0) { | |
49 | pr_debug("machine__create_kernel_maps "); | |
c0aab59f | 50 | goto out; |
0a4e1ae6 JO |
51 | } |
52 | ||
53 | /* | |
54 | * Step 3: | |
55 | * | |
56 | * Load and split /proc/kallsyms into multiple maps, one per module. | |
53d0fe68 ACM |
57 | * Do not use kcore, as this test was designed before kcore support |
58 | * and has parts that only make sense if using the non-kcore code. | |
59 | * XXX: extend it to stress the kcorre code as well, hint: the list | |
60 | * of modules extracted from /proc/kcore, in its current form, can't | |
61 | * be compacted against the list of modules found in the "vmlinux" | |
62 | * code and with the one got from /proc/modules from the "kallsyms" code. | |
0a4e1ae6 | 63 | */ |
53d0fe68 | 64 | if (__machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, true, NULL) <= 0) { |
0a4e1ae6 JO |
65 | pr_debug("dso__load_kallsyms "); |
66 | goto out; | |
67 | } | |
68 | ||
69 | /* | |
70 | * Step 4: | |
71 | * | |
72 | * kallsyms will be internally on demand sorted by name so that we can | |
73 | * find the reference relocation * symbol, i.e. the symbol we will use | |
74 | * to see if the running kernel was relocated by checking if it has the | |
75 | * same value in the vmlinux file we load. | |
76 | */ | |
a5e813c6 | 77 | kallsyms_map = machine__kernel_map(&kallsyms); |
0a4e1ae6 | 78 | |
0a4e1ae6 JO |
79 | /* |
80 | * Step 5: | |
81 | * | |
82 | * Now repeat step 2, this time for the vmlinux file we'll auto-locate. | |
83 | */ | |
84 | if (machine__create_kernel_maps(&vmlinux) < 0) { | |
85 | pr_debug("machine__create_kernel_maps "); | |
86 | goto out; | |
87 | } | |
88 | ||
a5e813c6 | 89 | vmlinux_map = machine__kernel_map(&vmlinux); |
0a4e1ae6 JO |
90 | |
91 | /* | |
92 | * Step 6: | |
93 | * | |
94 | * Locate a vmlinux file in the vmlinux path that has a buildid that | |
95 | * matches the one of the running kernel. | |
96 | * | |
97 | * While doing that look if we find the ref reloc symbol, if we find it | |
98 | * we'll have its ref_reloc_symbol.unrelocated_addr and then | |
99 | * maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines | |
100 | * to fixup the symbols. | |
101 | */ | |
102 | if (machine__load_vmlinux_path(&vmlinux, type, | |
103 | vmlinux_matches_kallsyms_filter) <= 0) { | |
531f67bb ACM |
104 | pr_debug("Couldn't find a vmlinux that matches the kernel running on this machine, skipping test\n"); |
105 | err = TEST_SKIP; | |
0a4e1ae6 JO |
106 | goto out; |
107 | } | |
108 | ||
109 | err = 0; | |
110 | /* | |
111 | * Step 7: | |
112 | * | |
113 | * Now look at the symbols in the vmlinux DSO and check if we find all of them | |
114 | * in the kallsyms dso. For the ones that are in both, check its names and | |
115 | * end addresses too. | |
116 | */ | |
117 | for (nd = rb_first(&vmlinux_map->dso->symbols[type]); nd; nd = rb_next(nd)) { | |
118 | struct symbol *pair, *first_pair; | |
0a4e1ae6 JO |
119 | |
120 | sym = rb_entry(nd, struct symbol, rb_node); | |
121 | ||
122 | if (sym->start == sym->end) | |
123 | continue; | |
124 | ||
d380b348 AH |
125 | mem_start = vmlinux_map->unmap_ip(vmlinux_map, sym->start); |
126 | mem_end = vmlinux_map->unmap_ip(vmlinux_map, sym->end); | |
127 | ||
128 | first_pair = machine__find_kernel_symbol(&kallsyms, type, | |
129 | mem_start, NULL, NULL); | |
0a4e1ae6 JO |
130 | pair = first_pair; |
131 | ||
82e75d00 | 132 | if (pair && UM(pair->start) == mem_start) { |
0a4e1ae6 JO |
133 | next_pair: |
134 | if (strcmp(sym->name, pair->name) == 0) { | |
135 | /* | |
136 | * kallsyms don't have the symbol end, so we | |
137 | * set that by using the next symbol start - 1, | |
138 | * in some cases we get this up to a page | |
139 | * wrong, trace_kmalloc when I was developing | |
140 | * this code was one such example, 2106 bytes | |
141 | * off the real size. More than that and we | |
142 | * _really_ have a problem. | |
143 | */ | |
82e75d00 | 144 | s64 skew = mem_end - UM(pair->end); |
5888a8c2 JO |
145 | if (llabs(skew) >= page_size) |
146 | pr_debug("%#" PRIx64 ": diff end addr for %s v: %#" PRIx64 " k: %#" PRIx64 "\n", | |
d380b348 | 147 | mem_start, sym->name, mem_end, |
82e75d00 | 148 | UM(pair->end)); |
5888a8c2 JO |
149 | |
150 | /* | |
151 | * Do not count this as a failure, because we | |
152 | * could really find a case where it's not | |
153 | * possible to get proper function end from | |
154 | * kallsyms. | |
155 | */ | |
156 | continue; | |
0a4e1ae6 | 157 | |
0a4e1ae6 | 158 | } else { |
ab414dcd ACM |
159 | pair = machine__find_kernel_symbol_by_name(&kallsyms, type, sym->name, NULL, NULL); |
160 | if (pair) { | |
161 | if (UM(pair->start) == mem_start) | |
0a4e1ae6 | 162 | goto next_pair; |
0a4e1ae6 | 163 | |
ab414dcd ACM |
164 | pr_debug("%#" PRIx64 ": diff name v: %s k: %s\n", |
165 | mem_start, sym->name, pair->name); | |
6566feaf ACM |
166 | } else { |
167 | pr_debug("%#" PRIx64 ": diff name v: %s k: %s\n", | |
168 | mem_start, sym->name, first_pair->name); | |
0a4e1ae6 | 169 | } |
0a4e1ae6 JO |
170 | } |
171 | } else | |
d380b348 AH |
172 | pr_debug("%#" PRIx64 ": %s not on kallsyms\n", |
173 | mem_start, sym->name); | |
0a4e1ae6 JO |
174 | |
175 | err = -1; | |
176 | } | |
177 | ||
178 | if (!verbose) | |
179 | goto out; | |
180 | ||
181 | pr_info("Maps only in vmlinux:\n"); | |
182 | ||
4bb7123d ACM |
183 | for (map = maps__first(maps); map; map = map__next(map)) { |
184 | struct map * | |
0a4e1ae6 JO |
185 | /* |
186 | * If it is the kernel, kallsyms is always "[kernel.kallsyms]", while | |
187 | * the kernel will have the path for the vmlinux file being used, | |
188 | * so use the short name, less descriptive but the same ("[kernel]" in | |
189 | * both cases. | |
190 | */ | |
191 | pair = map_groups__find_by_name(&kallsyms.kmaps, type, | |
4bb7123d ACM |
192 | (map->dso->kernel ? |
193 | map->dso->short_name : | |
194 | map->dso->name)); | |
0a4e1ae6 JO |
195 | if (pair) |
196 | pair->priv = 1; | |
197 | else | |
4bb7123d | 198 | map__fprintf(map, stderr); |
0a4e1ae6 JO |
199 | } |
200 | ||
201 | pr_info("Maps in vmlinux with a different name in kallsyms:\n"); | |
202 | ||
4bb7123d ACM |
203 | for (map = maps__first(maps); map; map = map__next(map)) { |
204 | struct map *pair; | |
0a4e1ae6 | 205 | |
4bb7123d ACM |
206 | mem_start = vmlinux_map->unmap_ip(vmlinux_map, map->start); |
207 | mem_end = vmlinux_map->unmap_ip(vmlinux_map, map->end); | |
d380b348 AH |
208 | |
209 | pair = map_groups__find(&kallsyms.kmaps, type, mem_start); | |
0a4e1ae6 JO |
210 | if (pair == NULL || pair->priv) |
211 | continue; | |
212 | ||
d380b348 | 213 | if (pair->start == mem_start) { |
0a4e1ae6 JO |
214 | pair->priv = 1; |
215 | pr_info(" %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s in kallsyms as", | |
4bb7123d | 216 | map->start, map->end, map->pgoff, map->dso->name); |
d380b348 AH |
217 | if (mem_end != pair->end) |
218 | pr_info(":\n*%" PRIx64 "-%" PRIx64 " %" PRIx64, | |
0a4e1ae6 JO |
219 | pair->start, pair->end, pair->pgoff); |
220 | pr_info(" %s\n", pair->dso->name); | |
221 | pair->priv = 1; | |
222 | } | |
223 | } | |
224 | ||
225 | pr_info("Maps only in kallsyms:\n"); | |
226 | ||
4bb7123d | 227 | maps = &kallsyms.kmaps.maps[type]; |
0a4e1ae6 | 228 | |
4bb7123d ACM |
229 | for (map = maps__first(maps); map; map = map__next(map)) { |
230 | if (!map->priv) | |
231 | map__fprintf(map, stderr); | |
0a4e1ae6 JO |
232 | } |
233 | out: | |
c0aab59f ACM |
234 | machine__exit(&kallsyms); |
235 | machine__exit(&vmlinux); | |
0a4e1ae6 JO |
236 | return err; |
237 | } |