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