145 lines
3.0 KiB
C
145 lines
3.0 KiB
C
#include <linux/compiler.h>
|
|
#include <linux/types.h>
|
|
#include <unistd.h>
|
|
#include "tests.h"
|
|
#include "debug.h"
|
|
#include "machine.h"
|
|
#include "event.h"
|
|
#include "unwind.h"
|
|
#include "perf_regs.h"
|
|
#include "map.h"
|
|
#include "thread.h"
|
|
|
|
static int mmap_handler(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample __maybe_unused,
|
|
struct machine *machine)
|
|
{
|
|
return machine__process_mmap2_event(machine, event, NULL);
|
|
}
|
|
|
|
static int init_live_machine(struct machine *machine)
|
|
{
|
|
union perf_event event;
|
|
pid_t pid = getpid();
|
|
|
|
return perf_event__synthesize_mmap_events(NULL, &event, pid, pid,
|
|
mmap_handler, machine, true);
|
|
}
|
|
|
|
#define MAX_STACK 6
|
|
|
|
static int unwind_entry(struct unwind_entry *entry, void *arg)
|
|
{
|
|
unsigned long *cnt = (unsigned long *) arg;
|
|
char *symbol = entry->sym ? entry->sym->name : NULL;
|
|
static const char *funcs[MAX_STACK] = {
|
|
"test__arch_unwind_sample",
|
|
"unwind_thread",
|
|
"krava_3",
|
|
"krava_2",
|
|
"krava_1",
|
|
"test__dwarf_unwind"
|
|
};
|
|
|
|
if (*cnt >= MAX_STACK) {
|
|
pr_debug("failed: crossed the max stack value %d\n", MAX_STACK);
|
|
return -1;
|
|
}
|
|
|
|
if (!symbol) {
|
|
pr_debug("failed: got unresolved address 0x%" PRIx64 "\n",
|
|
entry->ip);
|
|
return -1;
|
|
}
|
|
|
|
pr_debug("got: %s 0x%" PRIx64 "\n", symbol, entry->ip);
|
|
return strcmp((const char *) symbol, funcs[(*cnt)++]);
|
|
}
|
|
|
|
__attribute__ ((noinline))
|
|
static int unwind_thread(struct thread *thread, struct machine *machine)
|
|
{
|
|
struct perf_sample sample;
|
|
unsigned long cnt = 0;
|
|
int err = -1;
|
|
|
|
memset(&sample, 0, sizeof(sample));
|
|
|
|
if (test__arch_unwind_sample(&sample, thread)) {
|
|
pr_debug("failed to get unwind sample\n");
|
|
goto out;
|
|
}
|
|
|
|
err = unwind__get_entries(unwind_entry, &cnt, machine, thread,
|
|
&sample, MAX_STACK);
|
|
if (err)
|
|
pr_debug("unwind failed\n");
|
|
else if (cnt != MAX_STACK) {
|
|
pr_debug("got wrong number of stack entries %lu != %d\n",
|
|
cnt, MAX_STACK);
|
|
err = -1;
|
|
}
|
|
|
|
out:
|
|
free(sample.user_stack.data);
|
|
free(sample.user_regs.regs);
|
|
return err;
|
|
}
|
|
|
|
__attribute__ ((noinline))
|
|
static int krava_3(struct thread *thread, struct machine *machine)
|
|
{
|
|
return unwind_thread(thread, machine);
|
|
}
|
|
|
|
__attribute__ ((noinline))
|
|
static int krava_2(struct thread *thread, struct machine *machine)
|
|
{
|
|
return krava_3(thread, machine);
|
|
}
|
|
|
|
__attribute__ ((noinline))
|
|
static int krava_1(struct thread *thread, struct machine *machine)
|
|
{
|
|
return krava_2(thread, machine);
|
|
}
|
|
|
|
int test__dwarf_unwind(void)
|
|
{
|
|
struct machines machines;
|
|
struct machine *machine;
|
|
struct thread *thread;
|
|
int err = -1;
|
|
|
|
machines__init(&machines);
|
|
|
|
machine = machines__find(&machines, HOST_KERNEL_ID);
|
|
if (!machine) {
|
|
pr_err("Could not get machine\n");
|
|
return -1;
|
|
}
|
|
|
|
if (init_live_machine(machine)) {
|
|
pr_err("Could not init machine\n");
|
|
goto out;
|
|
}
|
|
|
|
if (verbose > 1)
|
|
machine__fprintf(machine, stderr);
|
|
|
|
thread = machine__find_thread(machine, getpid(), getpid());
|
|
if (!thread) {
|
|
pr_err("Could not get thread\n");
|
|
goto out;
|
|
}
|
|
|
|
err = krava_1(thread, machine);
|
|
|
|
out:
|
|
machine__delete_threads(machine);
|
|
machine__exit(machine);
|
|
machines__exit(&machines);
|
|
return err;
|
|
}
|