1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/compiler.h> 2 #include <linux/compiler.h>
3 #include <elfutils/libdw.h> 3 #include <elfutils/libdw.h>
4 #include <elfutils/libdwfl.h> 4 #include <elfutils/libdwfl.h>
5 #include <inttypes.h> 5 #include <inttypes.h>
6 #include <errno.h> 6 #include <errno.h>
7 #include "debug.h" 7 #include "debug.h"
8 #include "dso.h" <<
9 #include "unwind.h" 8 #include "unwind.h"
10 #include "unwind-libdw.h" 9 #include "unwind-libdw.h"
11 #include "machine.h" 10 #include "machine.h"
12 #include "map.h" <<
13 #include "symbol.h" <<
14 #include "thread.h" 11 #include "thread.h"
15 #include <linux/types.h> 12 #include <linux/types.h>
16 #include <linux/zalloc.h> <<
17 #include "event.h" 13 #include "event.h"
18 #include "perf_regs.h" 14 #include "perf_regs.h"
19 #include "callchain.h" 15 #include "callchain.h"
20 #include "util/env.h" !! 16 #include "util.h"
21 17
22 static char *debuginfo_path; 18 static char *debuginfo_path;
23 19
24 static int __find_debuginfo(Dwfl_Module *mod _ <<
25 const char *modnam <<
26 const char *file_n <<
27 GElf_Word debuglin <<
28 { <<
29 const struct dso *dso = *userdata; <<
30 <<
31 assert(dso); <<
32 if (dso__symsrc_filename(dso) && strcm <<
33 *debuginfo_file_name = strdup( <<
34 return -1; <<
35 } <<
36 <<
37 static const Dwfl_Callbacks offline_callbacks 20 static const Dwfl_Callbacks offline_callbacks = {
38 .find_debuginfo = __find_debug !! 21 .find_debuginfo = dwfl_standard_find_debuginfo,
39 .debuginfo_path = &debuginfo_p 22 .debuginfo_path = &debuginfo_path,
40 .section_address = dwfl_offline 23 .section_address = dwfl_offline_section_address,
41 // .find_elf is not set as we use dwfl <<
42 }; 24 };
43 25
44 static int __report_module(struct addr_locatio 26 static int __report_module(struct addr_location *al, u64 ip,
45 struct unwind_info 27 struct unwind_info *ui)
46 { 28 {
47 Dwfl_Module *mod; 29 Dwfl_Module *mod;
48 struct dso *dso = NULL; 30 struct dso *dso = NULL;
49 Dwarf_Addr base; <<
50 /* 31 /*
51 * Some callers will use al->sym, so w 32 * Some callers will use al->sym, so we can't just use the
52 * cheaper thread__find_map() here. 33 * cheaper thread__find_map() here.
53 */ 34 */
54 thread__find_symbol(ui->thread, PERF_R 35 thread__find_symbol(ui->thread, PERF_RECORD_MISC_USER, ip, al);
55 36
56 if (al->map) 37 if (al->map)
57 dso = map__dso(al->map); !! 38 dso = al->map->dso;
58 39
59 if (!dso) 40 if (!dso)
60 return 0; 41 return 0;
61 42
62 /* <<
63 * The generated JIT DSO files only ma <<
64 * ELF headers. Since JIT codes used <<
65 * segment, calculating the base addre <<
66 * a different code in another DSO. S <<
67 * directly to pick the correct one. <<
68 */ <<
69 if (!strncmp(dso__long_name(dso), "/tm <<
70 base = map__start(al->map); <<
71 else <<
72 base = map__start(al->map) - m <<
73 <<
74 mod = dwfl_addrmodule(ui->dwfl, ip); 43 mod = dwfl_addrmodule(ui->dwfl, ip);
75 if (mod) { 44 if (mod) {
76 Dwarf_Addr s; 45 Dwarf_Addr s;
77 46
78 dwfl_module_info(mod, NULL, &s 47 dwfl_module_info(mod, NULL, &s, NULL, NULL, NULL, NULL, NULL);
79 if (s != base) !! 48 if (s != al->map->start - al->map->pgoff)
80 mod = NULL; !! 49 mod = 0;
81 } <<
82 <<
83 if (!mod) { <<
84 char filename[PATH_MAX]; <<
85 <<
86 __symbol__join_symfs(filename, <<
87 mod = dwfl_report_elf(ui->dwfl <<
88 base, fa <<
89 } 50 }
90 if (!mod) { <<
91 char filename[PATH_MAX]; <<
92 51
93 if (dso__build_id_filename(dso !! 52 if (!mod)
94 mod = dwfl_report_elf( !! 53 mod = dwfl_report_elf(ui->dwfl, dso->short_name,
95 !! 54 (dso->symsrc_filename ? dso->symsrc_filename : dso->long_name), -1, al->map->start - al->map->pgoff,
96 } !! 55 false);
97 <<
98 if (mod) { <<
99 void **userdatap; <<
100 <<
101 dwfl_module_info(mod, &userdat <<
102 *userdatap = dso; <<
103 } <<
104 56
105 return mod && dwfl_addrmodule(ui->dwfl 57 return mod && dwfl_addrmodule(ui->dwfl, ip) == mod ? 0 : -1;
106 } 58 }
107 59
108 static int report_module(u64 ip, struct unwind 60 static int report_module(u64 ip, struct unwind_info *ui)
109 { 61 {
110 struct addr_location al; 62 struct addr_location al;
111 int res; <<
112 63
113 addr_location__init(&al); !! 64 return __report_module(&al, ip, ui);
114 res = __report_module(&al, ip, ui); <<
115 addr_location__exit(&al); <<
116 return res; <<
117 } 65 }
118 66
119 /* 67 /*
120 * Store all entries within entries array, 68 * Store all entries within entries array,
121 * we will process it after we finish unwind. 69 * we will process it after we finish unwind.
122 */ 70 */
123 static int entry(u64 ip, struct unwind_info *u 71 static int entry(u64 ip, struct unwind_info *ui)
124 72
125 { 73 {
126 struct unwind_entry *e = &ui->entries[ 74 struct unwind_entry *e = &ui->entries[ui->idx++];
127 struct addr_location al; 75 struct addr_location al;
128 76
129 addr_location__init(&al); !! 77 if (__report_module(&al, ip, ui))
130 if (__report_module(&al, ip, ui)) { <<
131 addr_location__exit(&al); <<
132 return -1; 78 return -1;
133 } <<
134 79
135 e->ip = ip; !! 80 e->ip = ip;
136 e->ms.maps = al.maps; !! 81 e->map = al.map;
137 e->ms.map = al.map; !! 82 e->sym = al.sym;
138 e->ms.sym = al.sym; <<
139 83
140 pr_debug("unwind: %s:ip = 0x%" PRIx64 84 pr_debug("unwind: %s:ip = 0x%" PRIx64 " (0x%" PRIx64 ")\n",
141 al.sym ? al.sym->name : "''", 85 al.sym ? al.sym->name : "''",
142 ip, 86 ip,
143 al.map ? map__map_ip(al.map, !! 87 al.map ? al.map->map_ip(al.map, ip) : (u64) 0);
144 addr_location__exit(&al); <<
145 return 0; 88 return 0;
146 } 89 }
147 90
148 static pid_t next_thread(Dwfl *dwfl, void *arg 91 static pid_t next_thread(Dwfl *dwfl, void *arg, void **thread_argp)
149 { 92 {
150 /* We want only single thread to be pr 93 /* We want only single thread to be processed. */
151 if (*thread_argp != NULL) 94 if (*thread_argp != NULL)
152 return 0; 95 return 0;
153 96
154 *thread_argp = arg; 97 *thread_argp = arg;
155 return dwfl_pid(dwfl); 98 return dwfl_pid(dwfl);
156 } 99 }
157 100
158 static int access_dso_mem(struct unwind_info * 101 static int access_dso_mem(struct unwind_info *ui, Dwarf_Addr addr,
159 Dwarf_Word *data) 102 Dwarf_Word *data)
160 { 103 {
161 struct addr_location al; 104 struct addr_location al;
162 ssize_t size; 105 ssize_t size;
163 struct dso *dso; <<
164 106
165 addr_location__init(&al); <<
166 if (!thread__find_map(ui->thread, PERF 107 if (!thread__find_map(ui->thread, PERF_RECORD_MISC_USER, addr, &al)) {
167 pr_debug("unwind: no map for % 108 pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
168 goto out_fail; !! 109 return -1;
169 } 110 }
170 dso = map__dso(al.map); <<
171 if (!dso) <<
172 goto out_fail; <<
173 111
174 size = dso__data_read_addr(dso, al.map !! 112 if (!al.map->dso)
>> 113 return -1;
>> 114
>> 115 size = dso__data_read_addr(al.map->dso, al.map, ui->machine,
>> 116 addr, (u8 *) data, sizeof(*data));
175 117
176 addr_location__exit(&al); <<
177 return !(size == sizeof(*data)); 118 return !(size == sizeof(*data));
178 out_fail: <<
179 addr_location__exit(&al); <<
180 return -1; <<
181 } 119 }
182 120
183 static bool memory_read(Dwfl *dwfl __maybe_unu 121 static bool memory_read(Dwfl *dwfl __maybe_unused, Dwarf_Addr addr, Dwarf_Word *result,
184 void *arg) 122 void *arg)
185 { 123 {
186 struct unwind_info *ui = arg; 124 struct unwind_info *ui = arg;
187 const char *arch = perf_env__arch(ui-> <<
188 struct stack_dump *stack = &ui->sample 125 struct stack_dump *stack = &ui->sample->user_stack;
189 u64 start, end; 126 u64 start, end;
190 int offset; 127 int offset;
191 int ret; 128 int ret;
192 129
193 ret = perf_reg_value(&start, &ui->samp !! 130 ret = perf_reg_value(&start, &ui->sample->user_regs, PERF_REG_SP);
194 perf_arch_reg_sp( <<
195 if (ret) 131 if (ret)
196 return false; 132 return false;
197 133
198 end = start + stack->size; 134 end = start + stack->size;
199 135
200 /* Check overflow. */ 136 /* Check overflow. */
201 if (addr + sizeof(Dwarf_Word) < addr) 137 if (addr + sizeof(Dwarf_Word) < addr)
202 return false; 138 return false;
203 139
204 if (addr < start || addr + sizeof(Dwar 140 if (addr < start || addr + sizeof(Dwarf_Word) > end) {
205 ret = access_dso_mem(ui, addr, 141 ret = access_dso_mem(ui, addr, result);
206 if (ret) { 142 if (ret) {
207 pr_debug("unwind: acce 143 pr_debug("unwind: access_mem 0x%" PRIx64 " not inside range"
208 " 0x%" PRIx64 144 " 0x%" PRIx64 "-0x%" PRIx64 "\n",
209 addr, start, e 145 addr, start, end);
210 return false; 146 return false;
211 } 147 }
212 return true; 148 return true;
213 } 149 }
214 150
215 offset = addr - start; 151 offset = addr - start;
216 *result = *(Dwarf_Word *)&stack->data[ 152 *result = *(Dwarf_Word *)&stack->data[offset];
217 pr_debug("unwind: access_mem addr 0x%" 153 pr_debug("unwind: access_mem addr 0x%" PRIx64 ", val %lx, offset %d\n",
218 addr, (unsigned long)*result, 154 addr, (unsigned long)*result, offset);
219 return true; 155 return true;
220 } 156 }
221 157
222 static const Dwfl_Thread_Callbacks callbacks = 158 static const Dwfl_Thread_Callbacks callbacks = {
223 .next_thread = next_thread, 159 .next_thread = next_thread,
224 .memory_read = memory_read, 160 .memory_read = memory_read,
225 .set_initial_registers = libdw__arch_ 161 .set_initial_registers = libdw__arch_set_initial_registers,
226 }; 162 };
227 163
228 static int 164 static int
229 frame_callback(Dwfl_Frame *state, void *arg) 165 frame_callback(Dwfl_Frame *state, void *arg)
230 { 166 {
231 struct unwind_info *ui = arg; 167 struct unwind_info *ui = arg;
232 Dwarf_Addr pc; 168 Dwarf_Addr pc;
233 bool isactivation; 169 bool isactivation;
234 170
235 if (!dwfl_frame_pc(state, &pc, NULL)) 171 if (!dwfl_frame_pc(state, &pc, NULL)) {
236 if (!ui->best_effort) !! 172 pr_err("%s", dwfl_errmsg(-1));
237 pr_err("%s", dwfl_errm <<
238 return DWARF_CB_ABORT; 173 return DWARF_CB_ABORT;
239 } 174 }
240 175
241 // report the module before we query f 176 // report the module before we query for isactivation
242 report_module(pc, ui); 177 report_module(pc, ui);
243 178
244 if (!dwfl_frame_pc(state, &pc, &isacti 179 if (!dwfl_frame_pc(state, &pc, &isactivation)) {
245 if (!ui->best_effort) !! 180 pr_err("%s", dwfl_errmsg(-1));
246 pr_err("%s", dwfl_errm <<
247 return DWARF_CB_ABORT; 181 return DWARF_CB_ABORT;
248 } 182 }
249 183
250 if (!isactivation) 184 if (!isactivation)
251 --pc; 185 --pc;
252 186
253 return entry(pc, ui) || !(--ui->max_st 187 return entry(pc, ui) || !(--ui->max_stack) ?
254 DWARF_CB_ABORT : DWARF_CB_OK; 188 DWARF_CB_ABORT : DWARF_CB_OK;
255 } 189 }
256 190
257 int unwind__get_entries(unwind_entry_cb_t cb, 191 int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
258 struct thread *thread, 192 struct thread *thread,
259 struct perf_sample *da 193 struct perf_sample *data,
260 int max_stack, !! 194 int max_stack)
261 bool best_effort) <<
262 { 195 {
263 struct unwind_info *ui, ui_buf = { 196 struct unwind_info *ui, ui_buf = {
264 .sample = data, 197 .sample = data,
265 .thread = thread, 198 .thread = thread,
266 .machine = maps__machin !! 199 .machine = thread->mg->machine,
267 .cb = cb, 200 .cb = cb,
268 .arg = arg, 201 .arg = arg,
269 .max_stack = max_stack, 202 .max_stack = max_stack,
270 .best_effort = best_effort <<
271 }; 203 };
272 const char *arch = perf_env__arch(ui_b <<
273 Dwarf_Word ip; 204 Dwarf_Word ip;
274 int err = -EINVAL, i; 205 int err = -EINVAL, i;
275 206
276 if (!data->user_regs.regs) 207 if (!data->user_regs.regs)
277 return -EINVAL; 208 return -EINVAL;
278 209
279 ui = zalloc(sizeof(ui_buf) + sizeof(ui 210 ui = zalloc(sizeof(ui_buf) + sizeof(ui_buf.entries[0]) * max_stack);
280 if (!ui) 211 if (!ui)
281 return -ENOMEM; 212 return -ENOMEM;
282 213
283 *ui = ui_buf; 214 *ui = ui_buf;
284 215
285 ui->dwfl = dwfl_begin(&offline_callbac 216 ui->dwfl = dwfl_begin(&offline_callbacks);
286 if (!ui->dwfl) 217 if (!ui->dwfl)
287 goto out; 218 goto out;
288 219
289 err = perf_reg_value(&ip, &data->user_ !! 220 err = perf_reg_value(&ip, &data->user_regs, PERF_REG_IP);
290 if (err) 221 if (err)
291 goto out; 222 goto out;
292 223
293 err = report_module(ip, ui); 224 err = report_module(ip, ui);
294 if (err) 225 if (err)
295 goto out; 226 goto out;
296 227
297 err = !dwfl_attach_state(ui->dwfl, EM_ !! 228 err = !dwfl_attach_state(ui->dwfl, EM_NONE, thread->tid, &callbacks, ui);
298 if (err) 229 if (err)
299 goto out; 230 goto out;
300 231
301 err = dwfl_getthread_frames(ui->dwfl, !! 232 err = dwfl_getthread_frames(ui->dwfl, thread->tid, frame_callback, ui);
302 233
303 if (err && ui->max_stack != max_stack) 234 if (err && ui->max_stack != max_stack)
304 err = 0; 235 err = 0;
305 236
306 /* 237 /*
307 * Display what we got based on the or 238 * Display what we got based on the order setup.
308 */ 239 */
309 for (i = 0; i < ui->idx && !err; i++) 240 for (i = 0; i < ui->idx && !err; i++) {
310 int j = i; 241 int j = i;
311 242
312 if (callchain_param.order == O 243 if (callchain_param.order == ORDER_CALLER)
313 j = ui->idx - i - 1; 244 j = ui->idx - i - 1;
314 245
315 err = ui->entries[j].ip ? ui-> 246 err = ui->entries[j].ip ? ui->cb(&ui->entries[j], ui->arg) : 0;
316 } 247 }
317 248
318 out: 249 out:
319 if (err) 250 if (err)
320 pr_debug("unwind: failed with 251 pr_debug("unwind: failed with '%s'\n", dwfl_errmsg(-1));
321 252
322 dwfl_end(ui->dwfl); 253 dwfl_end(ui->dwfl);
323 free(ui); 254 free(ui);
324 return 0; 255 return 0;
325 } 256 }
326 257
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.