diff options
Diffstat (limited to 'tools/perf/tests/dwarf-unwind.c')
| -rw-r--r-- | tools/perf/tests/dwarf-unwind.c | 102 |
1 files changed, 56 insertions, 46 deletions
diff --git a/tools/perf/tests/dwarf-unwind.c b/tools/perf/tests/dwarf-unwind.c index 7c8d2e422401..9ed78d00fb87 100644 --- a/tools/perf/tests/dwarf-unwind.c +++ b/tools/perf/tests/dwarf-unwind.c @@ -1,41 +1,41 @@ // SPDX-License-Identifier: GPL-2.0 #include <linux/compiler.h> #include <linux/types.h> +#include <linux/zalloc.h> #include <inttypes.h> +#include <limits.h> #include <unistd.h> #include "tests.h" #include "debug.h" +#include "env.h" #include "machine.h" #include "event.h" #include "../util/unwind.h" #include "perf_regs.h" #include "map.h" +#include "symbol.h" #include "thread.h" #include "callchain.h" -#if defined (__x86_64__) || defined (__i386__) || defined (__powerpc__) -#include "arch-tests.h" -#endif - /* For bsearch. We try to unwind functions in shared object. */ #include <stdlib.h> -static int mmap_handler(struct perf_tool *tool __maybe_unused, - union perf_event *event, - struct perf_sample *sample, - struct machine *machine) -{ - return machine__process_mmap2_event(machine, event, sample); -} - -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); -} +/* + * The test will assert frames are on the stack but tail call optimizations lose + * the frame of the caller. Clang can disable this optimization on a called + * function but GCC currently (11/2020) lacks this attribute. The barrier is + * used to inhibit tail calls in these cases. + */ +#ifdef __has_attribute +#if __has_attribute(disable_tail_calls) +#define NO_TAIL_CALL_ATTRIBUTE __attribute__((disable_tail_calls)) +#define NO_TAIL_CALL_BARRIER +#endif +#endif +#ifndef NO_TAIL_CALL_ATTRIBUTE +#define NO_TAIL_CALL_ATTRIBUTE +#define NO_TAIL_CALL_BARRIER __asm__ __volatile__("" : : : "memory"); +#endif /* * We need to keep these functions global, despite the @@ -49,13 +49,14 @@ int test_dwarf_unwind__compare(void *p1, void *p2); int test_dwarf_unwind__krava_3(struct thread *thread); int test_dwarf_unwind__krava_2(struct thread *thread); int test_dwarf_unwind__krava_1(struct thread *thread); +int test__dwarf_unwind(struct test_suite *test, int subtest); #define MAX_STACK 8 static int unwind_entry(struct unwind_entry *entry, void *arg) { unsigned long *cnt = (unsigned long *) arg; - char *symbol = entry->sym ? entry->sym->name : NULL; + char *symbol = entry->ms.sym ? entry->ms.sym->name : NULL; static const char *funcs[MAX_STACK] = { "test__arch_unwind_sample", "test_dwarf_unwind__thread", @@ -90,21 +91,20 @@ static int unwind_entry(struct unwind_entry *entry, void *arg) return strcmp((const char *) symbol, funcs[idx]); } -noinline int test_dwarf_unwind__thread(struct thread *thread) +NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__thread(struct thread *thread) { struct perf_sample sample; unsigned long cnt = 0; int err = -1; - memset(&sample, 0, sizeof(sample)); - + perf_sample__init(&sample, /*all=*/true); if (test__arch_unwind_sample(&sample, thread)) { pr_debug("failed to get unwind sample\n"); goto out; } err = unwind__get_entries(unwind_entry, &cnt, thread, - &sample, MAX_STACK); + &sample, MAX_STACK, false); if (err) pr_debug("unwind failed\n"); else if (cnt != MAX_STACK) { @@ -114,14 +114,15 @@ noinline int test_dwarf_unwind__thread(struct thread *thread) } out: - free(sample.user_stack.data); - free(sample.user_regs.regs); + zfree(&sample.user_stack.data); + zfree(&sample.user_regs->regs); + perf_sample__exit(&sample); return err; } static int global_unwind_retval = -INT_MAX; -noinline int test_dwarf_unwind__compare(void *p1, void *p2) +NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__compare(void *p1, void *p2) { /* Any possible value should be 'thread' */ struct thread *thread = *(struct thread **)p1; @@ -140,7 +141,7 @@ noinline int test_dwarf_unwind__compare(void *p1, void *p2) return p1 - p2; } -noinline int test_dwarf_unwind__krava_3(struct thread *thread) +NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_3(struct thread *thread) { struct thread *array[2] = {thread, thread}; void *fp = &bsearch; @@ -159,45 +160,52 @@ noinline int test_dwarf_unwind__krava_3(struct thread *thread) return global_unwind_retval; } -noinline int test_dwarf_unwind__krava_2(struct thread *thread) +NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_2(struct thread *thread) { - return test_dwarf_unwind__krava_3(thread); + int ret; + + ret = test_dwarf_unwind__krava_3(thread); + NO_TAIL_CALL_BARRIER; + return ret; } -noinline int test_dwarf_unwind__krava_1(struct thread *thread) +NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_1(struct thread *thread) { - return test_dwarf_unwind__krava_2(thread); + int ret; + + ret = test_dwarf_unwind__krava_2(thread); + NO_TAIL_CALL_BARRIER; + return ret; } -int test__dwarf_unwind(struct test *test __maybe_unused, int subtest __maybe_unused) +noinline int test__dwarf_unwind(struct test_suite *test __maybe_unused, + int subtest __maybe_unused) { + struct perf_env host_env; struct machine *machine; struct thread *thread; int err = -1; + pid_t pid = getpid(); + + callchain_param.record_mode = CALLCHAIN_DWARF; + dwarf_callchain_users = true; - machine = machine__new_host(); + perf_env__init(&host_env); + machine = machine__new_live(&host_env, /*kernel_maps=*/true, pid); if (!machine) { pr_err("Could not get machine\n"); - return -1; + goto out; } if (machine__create_kernel_maps(machine)) { pr_err("Failed to create kernel maps\n"); - return -1; - } - - callchain_param.record_mode = CALLCHAIN_DWARF; - dwarf_callchain_users = true; - - 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()); + thread = machine__find_thread(machine, pid, pid); if (!thread) { pr_err("Could not get thread\n"); goto out; @@ -207,7 +215,9 @@ int test__dwarf_unwind(struct test *test __maybe_unused, int subtest __maybe_unu thread__put(thread); out: - machine__delete_threads(machine); machine__delete(machine); + perf_env__exit(&host_env); return err; } + +DEFINE_SUITE("Test dwarf unwind", dwarf_unwind); |