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