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