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