perf tools: Introduce zfree
[deliverable/linux.git] / tools / perf / util / symbol-minimal.c
CommitLineData
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1#include "symbol.h"
2
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3#include <stdio.h>
4#include <fcntl.h>
5#include <string.h>
6#include <byteswap.h>
7#include <sys/stat.h>
393be2e3 8
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9
10static bool check_need_swap(int file_endian)
393be2e3 11{
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12 const int data = 1;
13 u8 *check = (u8 *)&data;
14 int host_endian;
15
16 if (check[0] == 1)
17 host_endian = ELFDATA2LSB;
18 else
19 host_endian = ELFDATA2MSB;
20
21 return host_endian != file_endian;
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22}
23
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24#define NOTE_ALIGN(sz) (((sz) + 3) & ~3)
25
26#define NT_GNU_BUILD_ID 3
27
28static int read_build_id(void *note_data, size_t note_len, void *bf,
29 size_t size, bool need_swap)
393be2e3 30{
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31 struct {
32 u32 n_namesz;
33 u32 n_descsz;
34 u32 n_type;
35 } *nhdr;
36 void *ptr;
37
38 ptr = note_data;
39 while (ptr < (note_data + note_len)) {
40 const char *name;
41 size_t namesz, descsz;
42
43 nhdr = ptr;
44 if (need_swap) {
45 nhdr->n_namesz = bswap_32(nhdr->n_namesz);
46 nhdr->n_descsz = bswap_32(nhdr->n_descsz);
47 nhdr->n_type = bswap_32(nhdr->n_type);
48 }
49
50 namesz = NOTE_ALIGN(nhdr->n_namesz);
51 descsz = NOTE_ALIGN(nhdr->n_descsz);
52
53 ptr += sizeof(*nhdr);
54 name = ptr;
55 ptr += namesz;
56 if (nhdr->n_type == NT_GNU_BUILD_ID &&
57 nhdr->n_namesz == sizeof("GNU")) {
58 if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
59 size_t sz = min(size, descsz);
60 memcpy(bf, ptr, sz);
61 memset(bf + sz, 0, size - sz);
62 return 0;
63 }
64 }
65 ptr += descsz;
66 }
67
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68 return -1;
69}
70
1d037ca1
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71int filename__read_debuglink(const char *filename __maybe_unused,
72 char *debuglink __maybe_unused,
73 size_t size __maybe_unused)
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74{
75 return -1;
76}
77
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78/*
79 * Just try PT_NOTE header otherwise fails
80 */
81int filename__read_build_id(const char *filename, void *bf, size_t size)
82{
83 FILE *fp;
84 int ret = -1;
85 bool need_swap = false;
86 u8 e_ident[EI_NIDENT];
87 size_t buf_size;
88 void *buf;
89 int i;
90
91 fp = fopen(filename, "r");
92 if (fp == NULL)
93 return -1;
94
95 if (fread(e_ident, sizeof(e_ident), 1, fp) != 1)
96 goto out;
97
98 if (memcmp(e_ident, ELFMAG, SELFMAG) ||
99 e_ident[EI_VERSION] != EV_CURRENT)
100 goto out;
101
102 need_swap = check_need_swap(e_ident[EI_DATA]);
103
104 /* for simplicity */
105 fseek(fp, 0, SEEK_SET);
106
107 if (e_ident[EI_CLASS] == ELFCLASS32) {
108 Elf32_Ehdr ehdr;
109 Elf32_Phdr *phdr;
110
111 if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
112 goto out;
113
114 if (need_swap) {
115 ehdr.e_phoff = bswap_32(ehdr.e_phoff);
116 ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
117 ehdr.e_phnum = bswap_16(ehdr.e_phnum);
118 }
119
120 buf_size = ehdr.e_phentsize * ehdr.e_phnum;
121 buf = malloc(buf_size);
122 if (buf == NULL)
123 goto out;
124
125 fseek(fp, ehdr.e_phoff, SEEK_SET);
126 if (fread(buf, buf_size, 1, fp) != 1)
127 goto out_free;
128
129 for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
130 void *tmp;
131
132 if (need_swap) {
133 phdr->p_type = bswap_32(phdr->p_type);
134 phdr->p_offset = bswap_32(phdr->p_offset);
135 phdr->p_filesz = bswap_32(phdr->p_filesz);
136 }
137
138 if (phdr->p_type != PT_NOTE)
139 continue;
140
141 buf_size = phdr->p_filesz;
142 tmp = realloc(buf, buf_size);
143 if (tmp == NULL)
144 goto out_free;
145
146 buf = tmp;
147 fseek(fp, phdr->p_offset, SEEK_SET);
148 if (fread(buf, buf_size, 1, fp) != 1)
149 goto out_free;
150
151 ret = read_build_id(buf, buf_size, bf, size, need_swap);
152 if (ret == 0)
153 ret = size;
154 break;
155 }
156 } else {
157 Elf64_Ehdr ehdr;
158 Elf64_Phdr *phdr;
159
160 if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
161 goto out;
162
163 if (need_swap) {
164 ehdr.e_phoff = bswap_64(ehdr.e_phoff);
165 ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
166 ehdr.e_phnum = bswap_16(ehdr.e_phnum);
167 }
168
169 buf_size = ehdr.e_phentsize * ehdr.e_phnum;
170 buf = malloc(buf_size);
171 if (buf == NULL)
172 goto out;
173
174 fseek(fp, ehdr.e_phoff, SEEK_SET);
175 if (fread(buf, buf_size, 1, fp) != 1)
176 goto out_free;
177
178 for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
179 void *tmp;
180
181 if (need_swap) {
182 phdr->p_type = bswap_32(phdr->p_type);
183 phdr->p_offset = bswap_64(phdr->p_offset);
184 phdr->p_filesz = bswap_64(phdr->p_filesz);
185 }
186
187 if (phdr->p_type != PT_NOTE)
188 continue;
189
190 buf_size = phdr->p_filesz;
191 tmp = realloc(buf, buf_size);
192 if (tmp == NULL)
193 goto out_free;
194
195 buf = tmp;
196 fseek(fp, phdr->p_offset, SEEK_SET);
197 if (fread(buf, buf_size, 1, fp) != 1)
198 goto out_free;
199
200 ret = read_build_id(buf, buf_size, bf, size, need_swap);
201 if (ret == 0)
202 ret = size;
203 break;
204 }
205 }
206out_free:
207 free(buf);
208out:
209 fclose(fp);
210 return ret;
211}
212
213int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
214{
215 int fd;
216 int ret = -1;
217 struct stat stbuf;
218 size_t buf_size;
219 void *buf;
220
221 fd = open(filename, O_RDONLY);
222 if (fd < 0)
223 return -1;
224
225 if (fstat(fd, &stbuf) < 0)
226 goto out;
227
228 buf_size = stbuf.st_size;
229 buf = malloc(buf_size);
230 if (buf == NULL)
231 goto out;
232
233 if (read(fd, buf, buf_size) != (ssize_t) buf_size)
234 goto out_free;
235
236 ret = read_build_id(buf, buf_size, build_id, size, false);
237out_free:
238 free(buf);
239out:
240 close(fd);
241 return ret;
242}
243
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244int symsrc__init(struct symsrc *ss, struct dso *dso __maybe_unused,
245 const char *name,
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246 enum dso_binary_type type)
247{
248 int fd = open(name, O_RDONLY);
249 if (fd < 0)
250 return -1;
251
252 ss->name = strdup(name);
253 if (!ss->name)
254 goto out_close;
255
779e24e2 256 ss->fd = fd;
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257 ss->type = type;
258
259 return 0;
260out_close:
261 close(fd);
262 return -1;
263}
264
1d037ca1 265bool symsrc__possibly_runtime(struct symsrc *ss __maybe_unused)
3aafe5ae
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266{
267 /* Assume all sym sources could be a runtime image. */
268 return true;
269}
270
1d037ca1 271bool symsrc__has_symtab(struct symsrc *ss __maybe_unused)
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272{
273 return false;
274}
275
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276void symsrc__destroy(struct symsrc *ss)
277{
278 free(ss->name);
279 close(ss->fd);
280}
281
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282int dso__synthesize_plt_symbols(struct dso *dso __maybe_unused,
283 struct symsrc *ss __maybe_unused,
284 struct map *map __maybe_unused,
285 symbol_filter_t filter __maybe_unused)
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286{
287 return 0;
288}
289
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290int dso__load_sym(struct dso *dso, struct map *map __maybe_unused,
291 struct symsrc *ss,
292 struct symsrc *runtime_ss __maybe_unused,
293 symbol_filter_t filter __maybe_unused,
294 int kmodule __maybe_unused)
393be2e3 295{
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296 unsigned char *build_id[BUILD_ID_SIZE];
297
b68e2f91 298 if (filename__read_build_id(ss->name, build_id, BUILD_ID_SIZE) > 0) {
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299 dso__set_build_id(dso, build_id);
300 return 1;
301 }
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302 return 0;
303}
304
8e0cf965
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305int file__read_maps(int fd __maybe_unused, bool exe __maybe_unused,
306 mapfn_t mapfn __maybe_unused, void *data __maybe_unused,
307 bool *is_64_bit __maybe_unused)
308{
309 return -1;
310}
311
afba19d9
AH
312int kcore_extract__create(struct kcore_extract *kce __maybe_unused)
313{
314 return -1;
315}
316
317void kcore_extract__delete(struct kcore_extract *kce __maybe_unused)
318{
319}
320
fc1b691d
AH
321int kcore_copy(const char *from_dir __maybe_unused,
322 const char *to_dir __maybe_unused)
323{
324 return -1;
325}
326
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327void symbol__elf_init(void)
328{
329}
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