perf tools: Do not disable source line lookup just because of 1 failure
[platform/adaptation/renesas_rcar/renesas_kernel.git] / tools / perf / util / srcline.c
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4
5 #include <linux/kernel.h>
6
7 #include "util/dso.h"
8 #include "util/util.h"
9 #include "util/debug.h"
10
11 #ifdef HAVE_LIBBFD_SUPPORT
12
13 /*
14  * Implement addr2line using libbfd.
15  */
16 #define PACKAGE "perf"
17 #include <bfd.h>
18
19 struct a2l_data {
20         const char      *input;
21         unsigned long   addr;
22
23         bool            found;
24         const char      *filename;
25         const char      *funcname;
26         unsigned        line;
27
28         bfd             *abfd;
29         asymbol         **syms;
30 };
31
32 static int bfd_error(const char *string)
33 {
34         const char *errmsg;
35
36         errmsg = bfd_errmsg(bfd_get_error());
37         fflush(stdout);
38
39         if (string)
40                 pr_debug("%s: %s\n", string, errmsg);
41         else
42                 pr_debug("%s\n", errmsg);
43
44         return -1;
45 }
46
47 static int slurp_symtab(bfd *abfd, struct a2l_data *a2l)
48 {
49         long storage;
50         long symcount;
51         asymbol **syms;
52         bfd_boolean dynamic = FALSE;
53
54         if ((bfd_get_file_flags(abfd) & HAS_SYMS) == 0)
55                 return bfd_error(bfd_get_filename(abfd));
56
57         storage = bfd_get_symtab_upper_bound(abfd);
58         if (storage == 0L) {
59                 storage = bfd_get_dynamic_symtab_upper_bound(abfd);
60                 dynamic = TRUE;
61         }
62         if (storage < 0L)
63                 return bfd_error(bfd_get_filename(abfd));
64
65         syms = malloc(storage);
66         if (dynamic)
67                 symcount = bfd_canonicalize_dynamic_symtab(abfd, syms);
68         else
69                 symcount = bfd_canonicalize_symtab(abfd, syms);
70
71         if (symcount < 0) {
72                 free(syms);
73                 return bfd_error(bfd_get_filename(abfd));
74         }
75
76         a2l->syms = syms;
77         return 0;
78 }
79
80 static void find_address_in_section(bfd *abfd, asection *section, void *data)
81 {
82         bfd_vma pc, vma;
83         bfd_size_type size;
84         struct a2l_data *a2l = data;
85
86         if (a2l->found)
87                 return;
88
89         if ((bfd_get_section_flags(abfd, section) & SEC_ALLOC) == 0)
90                 return;
91
92         pc = a2l->addr;
93         vma = bfd_get_section_vma(abfd, section);
94         size = bfd_get_section_size(section);
95
96         if (pc < vma || pc >= vma + size)
97                 return;
98
99         a2l->found = bfd_find_nearest_line(abfd, section, a2l->syms, pc - vma,
100                                            &a2l->filename, &a2l->funcname,
101                                            &a2l->line);
102 }
103
104 static struct a2l_data *addr2line_init(const char *path)
105 {
106         bfd *abfd;
107         struct a2l_data *a2l = NULL;
108
109         abfd = bfd_openr(path, NULL);
110         if (abfd == NULL)
111                 return NULL;
112
113         if (!bfd_check_format(abfd, bfd_object))
114                 goto out;
115
116         a2l = zalloc(sizeof(*a2l));
117         if (a2l == NULL)
118                 goto out;
119
120         a2l->abfd = abfd;
121         a2l->input = strdup(path);
122         if (a2l->input == NULL)
123                 goto out;
124
125         if (slurp_symtab(abfd, a2l))
126                 goto out;
127
128         return a2l;
129
130 out:
131         if (a2l) {
132                 free((void *)a2l->input);
133                 free(a2l);
134         }
135         bfd_close(abfd);
136         return NULL;
137 }
138
139 static void addr2line_cleanup(struct a2l_data *a2l)
140 {
141         if (a2l->abfd)
142                 bfd_close(a2l->abfd);
143         free((void *)a2l->input);
144         free(a2l->syms);
145         free(a2l);
146 }
147
148 static int addr2line(const char *dso_name, unsigned long addr,
149                      char **file, unsigned int *line, struct dso *dso)
150 {
151         int ret = 0;
152         struct a2l_data *a2l = dso->a2l;
153
154         if (!a2l) {
155                 dso->a2l = addr2line_init(dso_name);
156                 a2l = dso->a2l;
157         }
158
159         if (a2l == NULL) {
160                 pr_warning("addr2line_init failed for %s\n", dso_name);
161                 return 0;
162         }
163
164         a2l->addr = addr;
165         a2l->found = false;
166
167         bfd_map_over_sections(a2l->abfd, find_address_in_section, a2l);
168
169         if (a2l->found && a2l->filename) {
170                 *file = strdup(a2l->filename);
171                 *line = a2l->line;
172
173                 if (*file)
174                         ret = 1;
175         }
176
177         return ret;
178 }
179
180 void dso__free_a2l(struct dso *dso)
181 {
182         struct a2l_data *a2l = dso->a2l;
183
184         if (!a2l)
185                 return;
186
187         addr2line_cleanup(a2l);
188
189         dso->a2l = NULL;
190 }
191
192 #else /* HAVE_LIBBFD_SUPPORT */
193
194 static int addr2line(const char *dso_name, unsigned long addr,
195                      char **file, unsigned int *line_nr,
196                      struct dso *dso __maybe_unused)
197 {
198         FILE *fp;
199         char cmd[PATH_MAX];
200         char *filename = NULL;
201         size_t len;
202         char *sep;
203         int ret = 0;
204
205         scnprintf(cmd, sizeof(cmd), "addr2line -e %s %016"PRIx64,
206                   dso_name, addr);
207
208         fp = popen(cmd, "r");
209         if (fp == NULL) {
210                 pr_warning("popen failed for %s\n", dso_name);
211                 return 0;
212         }
213
214         if (getline(&filename, &len, fp) < 0 || !len) {
215                 pr_warning("addr2line has no output for %s\n", dso_name);
216                 goto out;
217         }
218
219         sep = strchr(filename, '\n');
220         if (sep)
221                 *sep = '\0';
222
223         if (!strcmp(filename, "??:0")) {
224                 pr_debug("no debugging info in %s\n", dso_name);
225                 free(filename);
226                 goto out;
227         }
228
229         sep = strchr(filename, ':');
230         if (sep) {
231                 *sep++ = '\0';
232                 *file = filename;
233                 *line_nr = strtoul(sep, NULL, 0);
234                 ret = 1;
235         }
236 out:
237         pclose(fp);
238         return ret;
239 }
240
241 void dso__free_a2l(struct dso *dso __maybe_unused)
242 {
243 }
244
245 #endif /* HAVE_LIBBFD_SUPPORT */
246
247 /*
248  * Number of addr2line failures (without success) before disabling it for that
249  * dso.
250  */
251 #define A2L_FAIL_LIMIT 123
252
253 char *get_srcline(struct dso *dso, unsigned long addr)
254 {
255         char *file = NULL;
256         unsigned line = 0;
257         char *srcline;
258         char *dso_name;
259
260         if (!dso->has_srcline)
261                 return SRCLINE_UNKNOWN;
262
263         if (dso->symsrc_filename)
264                 dso_name = dso->symsrc_filename;
265         else
266                 dso_name = dso->long_name;
267
268         if (dso_name[0] == '[')
269                 goto out;
270
271         if (!strncmp(dso_name, "/tmp/perf-", 10))
272                 goto out;
273
274         if (!addr2line(dso_name, addr, &file, &line, dso))
275                 goto out;
276
277         if (asprintf(&srcline, "%s:%u", file, line) < 0) {
278                 free(file);
279                 goto out;
280         }
281
282         dso->a2l_fails = 0;
283
284         free(file);
285         return srcline;
286
287 out:
288         if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) {
289                 dso->has_srcline = 0;
290                 dso__free_a2l(dso);
291         }
292         return SRCLINE_UNKNOWN;
293 }
294
295 void free_srcline(char *srcline)
296 {
297         if (srcline && strcmp(srcline, SRCLINE_UNKNOWN) != 0)
298                 free(srcline);
299 }