blob: 035b9fa063a9453002873c00f654adcd13a99eb2 [file] [log] [blame]
Arnaldo Carvalho de Melo1c6a8002010-04-29 18:58:32 -03001/*
2 * builtin-test.c
3 *
4 * Builtin regression testing command: ever growing number of sanity tests
5 */
6#include "builtin.h"
7
8#include "util/cache.h"
9#include "util/debug.h"
10#include "util/parse-options.h"
11#include "util/session.h"
12#include "util/symbol.h"
13#include "util/thread.h"
14
15static long page_size;
16
17static int vmlinux_matches_kallsyms_filter(struct map *map __used, struct symbol *sym)
18{
19 bool *visited = symbol__priv(sym);
20 *visited = true;
21 return 0;
22}
23
24static int test__vmlinux_matches_kallsyms(void)
25{
26 int err = -1;
27 struct rb_node *nd;
28 struct symbol *sym;
29 struct map *kallsyms_map, *vmlinux_map;
30 struct machine kallsyms, vmlinux;
31 enum map_type type = MAP__FUNCTION;
32 struct ref_reloc_sym ref_reloc_sym = { .name = "_stext", };
33
34 /*
35 * Step 1:
36 *
37 * Init the machines that will hold kernel, modules obtained from
38 * both vmlinux + .ko files and from /proc/kallsyms split by modules.
39 */
40 machine__init(&kallsyms, "", HOST_KERNEL_ID);
41 machine__init(&vmlinux, "", HOST_KERNEL_ID);
42
43 /*
44 * Step 2:
45 *
46 * Create the kernel maps for kallsyms and the DSO where we will then
47 * load /proc/kallsyms. Also create the modules maps from /proc/modules
48 * and find the .ko files that match them in /lib/modules/`uname -r`/.
49 */
50 if (machine__create_kernel_maps(&kallsyms) < 0) {
51 pr_debug("machine__create_kernel_maps ");
52 return -1;
53 }
54
55 /*
56 * Step 3:
57 *
58 * Load and split /proc/kallsyms into multiple maps, one per module.
59 */
60 if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, NULL) <= 0) {
61 pr_debug("dso__load_kallsyms ");
62 goto out;
63 }
64
65 /*
66 * Step 4:
67 *
68 * kallsyms will be internally on demand sorted by name so that we can
69 * find the reference relocation * symbol, i.e. the symbol we will use
70 * to see if the running kernel was relocated by checking if it has the
71 * same value in the vmlinux file we load.
72 */
73 kallsyms_map = machine__kernel_map(&kallsyms, type);
74
75 sym = map__find_symbol_by_name(kallsyms_map, ref_reloc_sym.name, NULL);
76 if (sym == NULL) {
77 pr_debug("dso__find_symbol_by_name ");
78 goto out;
79 }
80
81 ref_reloc_sym.addr = sym->start;
82
83 /*
84 * Step 5:
85 *
86 * Now repeat step 2, this time for the vmlinux file we'll auto-locate.
87 */
88 if (machine__create_kernel_maps(&vmlinux) < 0) {
89 pr_debug("machine__create_kernel_maps ");
90 goto out;
91 }
92
93 vmlinux_map = machine__kernel_map(&vmlinux, type);
94 map__kmap(vmlinux_map)->ref_reloc_sym = &ref_reloc_sym;
95
96 /*
97 * Step 6:
98 *
99 * Locate a vmlinux file in the vmlinux path that has a buildid that
100 * matches the one of the running kernel.
101 *
102 * While doing that look if we find the ref reloc symbol, if we find it
103 * we'll have its ref_reloc_symbol.unrelocated_addr and then
104 * maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines
105 * to fixup the symbols.
106 */
107 if (machine__load_vmlinux_path(&vmlinux, type,
108 vmlinux_matches_kallsyms_filter) <= 0) {
109 pr_debug("machine__load_vmlinux_path ");
110 goto out;
111 }
112
113 err = 0;
114 /*
115 * Step 7:
116 *
117 * Now look at the symbols in the vmlinux DSO and check if we find all of them
118 * in the kallsyms dso. For the ones that are in both, check its names and
119 * end addresses too.
120 */
121 for (nd = rb_first(&vmlinux_map->dso->symbols[type]); nd; nd = rb_next(nd)) {
122 struct symbol *pair;
123
124 sym = rb_entry(nd, struct symbol, rb_node);
125 pair = machine__find_kernel_symbol(&kallsyms, type, sym->start, NULL, NULL);
126
127 if (pair && pair->start == sym->start) {
128next_pair:
129 if (strcmp(sym->name, pair->name) == 0) {
130 /*
131 * kallsyms don't have the symbol end, so we
132 * set that by using the next symbol start - 1,
133 * in some cases we get this up to a page
134 * wrong, trace_kmalloc when I was developing
135 * this code was one such example, 2106 bytes
136 * off the real size. More than that and we
137 * _really_ have a problem.
138 */
139 s64 skew = sym->end - pair->end;
140 if (llabs(skew) < page_size)
141 continue;
142
143 pr_debug("%#Lx: diff end addr for %s v: %#Lx k: %#Lx\n",
144 sym->start, sym->name, sym->end, pair->end);
145 } else {
146 struct rb_node *nnd = rb_prev(&pair->rb_node);
147
148 if (nnd) {
149 struct symbol *next = rb_entry(nnd, struct symbol, rb_node);
150
151 if (next->start == sym->start) {
152 pair = next;
153 goto next_pair;
154 }
155 }
156 pr_debug("%#Lx: diff name v: %s k: %s\n",
157 sym->start, sym->name, pair->name);
158 }
159 } else
160 pr_debug("%#Lx: %s not on kallsyms\n", sym->start, sym->name);
161
162 err = -1;
163 }
164
165 if (!verbose)
166 goto out;
167
168 pr_info("Maps only in vmlinux:\n");
169
170 for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
171 struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
172 /*
173 * If it is the kernel, kallsyms is always "[kernel.kallsyms]", while
174 * the kernel will have the path for the vmlinux file being used,
175 * so use the short name, less descriptive but the same ("[kernel]" in
176 * both cases.
177 */
178 pair = map_groups__find_by_name(&kallsyms.kmaps, type,
179 (pos->dso->kernel ?
180 pos->dso->short_name :
181 pos->dso->name));
182 if (pair)
183 pair->priv = 1;
184 else
185 map__fprintf(pos, stderr);
186 }
187
188 pr_info("Maps in vmlinux with a different name in kallsyms:\n");
189
190 for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
191 struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
192
193 pair = map_groups__find(&kallsyms.kmaps, type, pos->start);
194 if (pair == NULL || pair->priv)
195 continue;
196
197 if (pair->start == pos->start) {
198 pair->priv = 1;
199 pr_info(" %Lx-%Lx %Lx %s in kallsyms as",
200 pos->start, pos->end, pos->pgoff, pos->dso->name);
201 if (pos->pgoff != pair->pgoff || pos->end != pair->end)
202 pr_info(": \n*%Lx-%Lx %Lx",
203 pair->start, pair->end, pair->pgoff);
204 pr_info(" %s\n", pair->dso->name);
205 pair->priv = 1;
206 }
207 }
208
209 pr_info("Maps only in kallsyms:\n");
210
211 for (nd = rb_first(&kallsyms.kmaps.maps[type]);
212 nd; nd = rb_next(nd)) {
213 struct map *pos = rb_entry(nd, struct map, rb_node);
214
215 if (!pos->priv)
216 map__fprintf(pos, stderr);
217 }
218out:
219 return err;
220}
221
222static struct test {
223 const char *desc;
224 int (*func)(void);
225} tests[] = {
226 {
227 .desc = "vmlinux symtab matches kallsyms",
228 .func = test__vmlinux_matches_kallsyms,
229 },
230 {
231 .func = NULL,
232 },
233};
234
235static int __cmd_test(void)
236{
237 int i = 0;
238
239 page_size = sysconf(_SC_PAGE_SIZE);
240
241 while (tests[i].func) {
242 int err;
243 pr_info("%2d: %s:", i + 1, tests[i].desc);
244 pr_debug("\n--- start ---\n");
245 err = tests[i].func();
246 pr_debug("---- end ----\n%s:", tests[i].desc);
247 pr_info(" %s\n", err ? "FAILED!\n" : "Ok");
248 ++i;
249 }
250
251 return 0;
252}
253
254static const char * const test_usage[] = {
255 "perf test [<options>]",
256 NULL,
257};
258
259static const struct option test_options[] = {
Arnaldo Carvalho de Melo80354582010-05-17 15:51:10 -0300260 OPT_INTEGER('v', "verbose", &verbose,
Arnaldo Carvalho de Melo1c6a8002010-04-29 18:58:32 -0300261 "be more verbose (show symbol address, etc)"),
262 OPT_END()
263};
264
265int cmd_test(int argc, const char **argv, const char *prefix __used)
266{
267 argc = parse_options(argc, argv, test_options, test_usage, 0);
268 if (argc)
269 usage_with_options(test_usage, test_options);
270
271 symbol_conf.priv_size = sizeof(int);
272 symbol_conf.sort_by_name = true;
273 symbol_conf.try_vmlinux_path = true;
274
275 if (symbol__init() < 0)
276 return -1;
277
278 setup_pager();
279
280 return __cmd_test();
281}