blob: c059ee81c038abd1417c06172274c98d11a9c3ac [file] [log] [blame]
Jiri Olsaaa16b812014-01-07 13:47:22 +01001#include <linux/compiler.h>
2#include <sys/types.h>
3#include <unistd.h>
4#include "tests.h"
5#include "debug.h"
6#include "machine.h"
7#include "event.h"
8#include "unwind.h"
9#include "perf_regs.h"
10#include "map.h"
11#include "thread.h"
12
13static int mmap_handler(struct perf_tool *tool __maybe_unused,
14 union perf_event *event,
15 struct perf_sample *sample __maybe_unused,
16 struct machine *machine)
17{
18 return machine__process_mmap_event(machine, event, NULL);
19}
20
21static int init_live_machine(struct machine *machine)
22{
23 union perf_event event;
24 pid_t pid = getpid();
25
26 return perf_event__synthesize_mmap_events(NULL, &event, pid, pid,
27 mmap_handler, machine, true);
28}
29
30#define MAX_STACK 6
31
32static int unwind_entry(struct unwind_entry *entry, void *arg)
33{
34 unsigned long *cnt = (unsigned long *) arg;
35 char *symbol = entry->sym ? entry->sym->name : NULL;
36 static const char *funcs[MAX_STACK] = {
37 "test__arch_unwind_sample",
38 "unwind_thread",
39 "krava_3",
40 "krava_2",
41 "krava_1",
42 "test__dwarf_unwind"
43 };
44
45 if (*cnt >= MAX_STACK) {
46 pr_debug("failed: crossed the max stack value %d\n", MAX_STACK);
47 return -1;
48 }
49
50 if (!symbol) {
51 pr_debug("failed: got unresolved address 0x%" PRIx64 "\n",
52 entry->ip);
53 return -1;
54 }
55
56 pr_debug("got: %s 0x%" PRIx64 "\n", symbol, entry->ip);
57 return strcmp((const char *) symbol, funcs[(*cnt)++]);
58}
59
60__attribute__ ((noinline))
61static int unwind_thread(struct thread *thread, struct machine *machine)
62{
63 struct perf_sample sample;
64 unsigned long cnt = 0;
65 int err = -1;
66
67 memset(&sample, 0, sizeof(sample));
68
69 if (test__arch_unwind_sample(&sample, thread)) {
70 pr_debug("failed to get unwind sample\n");
71 goto out;
72 }
73
74 err = unwind__get_entries(unwind_entry, &cnt, machine, thread,
Jiri Olsa352ea452014-01-07 13:47:25 +010075 &sample, MAX_STACK);
Jiri Olsaaa16b812014-01-07 13:47:22 +010076 if (err)
77 pr_debug("unwind failed\n");
78 else if (cnt != MAX_STACK) {
79 pr_debug("got wrong number of stack entries %lu != %d\n",
80 cnt, MAX_STACK);
81 err = -1;
82 }
83
84 out:
85 free(sample.user_stack.data);
86 free(sample.user_regs.regs);
87 return err;
88}
89
90__attribute__ ((noinline))
91static int krava_3(struct thread *thread, struct machine *machine)
92{
93 return unwind_thread(thread, machine);
94}
95
96__attribute__ ((noinline))
97static int krava_2(struct thread *thread, struct machine *machine)
98{
99 return krava_3(thread, machine);
100}
101
102__attribute__ ((noinline))
103static int krava_1(struct thread *thread, struct machine *machine)
104{
105 return krava_2(thread, machine);
106}
107
108int test__dwarf_unwind(void)
109{
110 struct machines machines;
111 struct machine *machine;
112 struct thread *thread;
113 int err = -1;
114
115 machines__init(&machines);
116
117 machine = machines__find(&machines, HOST_KERNEL_ID);
118 if (!machine) {
119 pr_err("Could not get machine\n");
120 return -1;
121 }
122
123 if (init_live_machine(machine)) {
124 pr_err("Could not init machine\n");
125 goto out;
126 }
127
128 if (verbose > 1)
129 machine__fprintf(machine, stderr);
130
Jiri Olsad75e6092014-03-14 15:00:03 +0100131 thread = machine__find_thread(machine, getpid(), getpid());
Jiri Olsaaa16b812014-01-07 13:47:22 +0100132 if (!thread) {
133 pr_err("Could not get thread\n");
134 goto out;
135 }
136
137 err = krava_1(thread, machine);
138
139 out:
140 machine__delete_threads(machine);
141 machine__exit(machine);
142 machines__exit(&machines);
143 return err;
144}