Jiri Olsa | aa16b81 | 2014-01-07 13:47:22 +0100 | [diff] [blame] | 1 | #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 | |
| 13 | static 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 | |
| 21 | static 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 | |
| 32 | static 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)) |
| 61 | static 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 Olsa | 352ea45 | 2014-01-07 13:47:25 +0100 | [diff] [blame^] | 75 | &sample, MAX_STACK); |
Jiri Olsa | aa16b81 | 2014-01-07 13:47:22 +0100 | [diff] [blame] | 76 | 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)) |
| 91 | static int krava_3(struct thread *thread, struct machine *machine) |
| 92 | { |
| 93 | return unwind_thread(thread, machine); |
| 94 | } |
| 95 | |
| 96 | __attribute__ ((noinline)) |
| 97 | static int krava_2(struct thread *thread, struct machine *machine) |
| 98 | { |
| 99 | return krava_3(thread, machine); |
| 100 | } |
| 101 | |
| 102 | __attribute__ ((noinline)) |
| 103 | static int krava_1(struct thread *thread, struct machine *machine) |
| 104 | { |
| 105 | return krava_2(thread, machine); |
| 106 | } |
| 107 | |
| 108 | int 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 | |
| 131 | thread = machine__find_thread(machine, getpid()); |
| 132 | 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 | } |