This source file includes following definitions.
- mmap_handler
- init_live_machine
- unwind_entry
- test_dwarf_unwind__thread
- test_dwarf_unwind__compare
- test_dwarf_unwind__krava_3
- test_dwarf_unwind__krava_2
- test_dwarf_unwind__krava_1
- test__dwarf_unwind
1
2 #include <linux/compiler.h>
3 #include <linux/types.h>
4 #include <linux/zalloc.h>
5 #include <inttypes.h>
6 #include <limits.h>
7 #include <unistd.h>
8 #include "tests.h"
9 #include "debug.h"
10 #include "machine.h"
11 #include "event.h"
12 #include "../util/unwind.h"
13 #include "perf_regs.h"
14 #include "map.h"
15 #include "symbol.h"
16 #include "thread.h"
17 #include "callchain.h"
18 #include "util/synthetic-events.h"
19
20 #if defined (__x86_64__) || defined (__i386__) || defined (__powerpc__)
21 #include "arch-tests.h"
22 #endif
23
24
25 #include <stdlib.h>
26
27 static int mmap_handler(struct perf_tool *tool __maybe_unused,
28 union perf_event *event,
29 struct perf_sample *sample,
30 struct machine *machine)
31 {
32 return machine__process_mmap2_event(machine, event, sample);
33 }
34
35 static int init_live_machine(struct machine *machine)
36 {
37 union perf_event event;
38 pid_t pid = getpid();
39
40 return perf_event__synthesize_mmap_events(NULL, &event, pid, pid,
41 mmap_handler, machine, true);
42 }
43
44
45
46
47
48
49
50
51 int test_dwarf_unwind__thread(struct thread *thread);
52 int test_dwarf_unwind__compare(void *p1, void *p2);
53 int test_dwarf_unwind__krava_3(struct thread *thread);
54 int test_dwarf_unwind__krava_2(struct thread *thread);
55 int test_dwarf_unwind__krava_1(struct thread *thread);
56
57 #define MAX_STACK 8
58
59 static int unwind_entry(struct unwind_entry *entry, void *arg)
60 {
61 unsigned long *cnt = (unsigned long *) arg;
62 char *symbol = entry->sym ? entry->sym->name : NULL;
63 static const char *funcs[MAX_STACK] = {
64 "test__arch_unwind_sample",
65 "test_dwarf_unwind__thread",
66 "test_dwarf_unwind__compare",
67 "bsearch",
68 "test_dwarf_unwind__krava_3",
69 "test_dwarf_unwind__krava_2",
70 "test_dwarf_unwind__krava_1",
71 "test__dwarf_unwind"
72 };
73
74
75
76
77 int idx = callchain_param.order == ORDER_CALLER ?
78 MAX_STACK - *cnt - 1 : *cnt;
79
80 if (*cnt >= MAX_STACK) {
81 pr_debug("failed: crossed the max stack value %d\n", MAX_STACK);
82 return -1;
83 }
84
85 if (!symbol) {
86 pr_debug("failed: got unresolved address 0x%" PRIx64 "\n",
87 entry->ip);
88 return -1;
89 }
90
91 (*cnt)++;
92 pr_debug("got: %s 0x%" PRIx64 ", expecting %s\n",
93 symbol, entry->ip, funcs[idx]);
94 return strcmp((const char *) symbol, funcs[idx]);
95 }
96
97 noinline int test_dwarf_unwind__thread(struct thread *thread)
98 {
99 struct perf_sample sample;
100 unsigned long cnt = 0;
101 int err = -1;
102
103 memset(&sample, 0, sizeof(sample));
104
105 if (test__arch_unwind_sample(&sample, thread)) {
106 pr_debug("failed to get unwind sample\n");
107 goto out;
108 }
109
110 err = unwind__get_entries(unwind_entry, &cnt, thread,
111 &sample, MAX_STACK);
112 if (err)
113 pr_debug("unwind failed\n");
114 else if (cnt != MAX_STACK) {
115 pr_debug("got wrong number of stack entries %lu != %d\n",
116 cnt, MAX_STACK);
117 err = -1;
118 }
119
120 out:
121 zfree(&sample.user_stack.data);
122 zfree(&sample.user_regs.regs);
123 return err;
124 }
125
126 static int global_unwind_retval = -INT_MAX;
127
128 noinline int test_dwarf_unwind__compare(void *p1, void *p2)
129 {
130
131 struct thread *thread = *(struct thread **)p1;
132
133 if (global_unwind_retval == -INT_MAX) {
134
135 callchain_param.order = ORDER_CALLER;
136
137 global_unwind_retval = test_dwarf_unwind__thread(thread);
138 if (!global_unwind_retval) {
139 callchain_param.order = ORDER_CALLEE;
140 global_unwind_retval = test_dwarf_unwind__thread(thread);
141 }
142 }
143
144 return p1 - p2;
145 }
146
147 noinline int test_dwarf_unwind__krava_3(struct thread *thread)
148 {
149 struct thread *array[2] = {thread, thread};
150 void *fp = &bsearch;
151
152
153
154
155
156
157 void *(*volatile _bsearch)(void *, void *, size_t,
158 size_t, int (*)(void *, void *));
159
160 _bsearch = fp;
161 _bsearch(array, &thread, 2, sizeof(struct thread **),
162 test_dwarf_unwind__compare);
163 return global_unwind_retval;
164 }
165
166 noinline int test_dwarf_unwind__krava_2(struct thread *thread)
167 {
168 return test_dwarf_unwind__krava_3(thread);
169 }
170
171 noinline int test_dwarf_unwind__krava_1(struct thread *thread)
172 {
173 return test_dwarf_unwind__krava_2(thread);
174 }
175
176 int test__dwarf_unwind(struct test *test __maybe_unused, int subtest __maybe_unused)
177 {
178 struct machine *machine;
179 struct thread *thread;
180 int err = -1;
181
182 machine = machine__new_host();
183 if (!machine) {
184 pr_err("Could not get machine\n");
185 return -1;
186 }
187
188 if (machine__create_kernel_maps(machine)) {
189 pr_err("Failed to create kernel maps\n");
190 return -1;
191 }
192
193 callchain_param.record_mode = CALLCHAIN_DWARF;
194 dwarf_callchain_users = true;
195
196 if (init_live_machine(machine)) {
197 pr_err("Could not init machine\n");
198 goto out;
199 }
200
201 if (verbose > 1)
202 machine__fprintf(machine, stderr);
203
204 thread = machine__find_thread(machine, getpid(), getpid());
205 if (!thread) {
206 pr_err("Could not get thread\n");
207 goto out;
208 }
209
210 err = test_dwarf_unwind__krava_1(thread);
211 thread__put(thread);
212
213 out:
214 machine__delete_threads(machine);
215 machine__delete(machine);
216 return err;
217 }