1// SPDX-License-Identifier: GPL-2.0
  2/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
  3#include <test_progs.h>
  4
  5#include "test_build_id.skel.h"
  6
  7static char build_id[BPF_BUILD_ID_SIZE];
  8static int build_id_sz;
  9
 10static void print_stack(struct bpf_stack_build_id *stack, int frame_cnt)
 11{
 12	int i, j;
 13
 14	for (i = 0; i < frame_cnt; i++) {
 15		printf("FRAME #%02d: ", i);
 16		switch (stack[i].status) {
 17		case BPF_STACK_BUILD_ID_EMPTY:
 18			printf("<EMPTY>\n");
 19			break;
 20		case BPF_STACK_BUILD_ID_VALID:
 21			printf("BUILD ID = ");
 22			for (j = 0; j < BPF_BUILD_ID_SIZE; j++)
 23				printf("%02hhx", (unsigned)stack[i].build_id[j]);
 24			printf(" OFFSET = %llx", (unsigned long long)stack[i].offset);
 25			break;
 26		case BPF_STACK_BUILD_ID_IP:
 27			printf("IP = %llx", (unsigned long long)stack[i].ip);
 28			break;
 29		default:
 30			printf("UNEXPECTED STATUS %d ", stack[i].status);
 31			break;
 32		}
 33		printf("\n");
 34	}
 35}
 36
 37static void subtest_nofault(bool build_id_resident)
 38{
 39	struct test_build_id *skel;
 40	struct bpf_stack_build_id *stack;
 41	int frame_cnt;
 42
 43	skel = test_build_id__open_and_load();
 44	if (!ASSERT_OK_PTR(skel, "skel_open"))
 45		return;
 46
 47	skel->links.uprobe_nofault = bpf_program__attach(skel->progs.uprobe_nofault);
 48	if (!ASSERT_OK_PTR(skel->links.uprobe_nofault, "link"))
 49		goto cleanup;
 50
 51	if (build_id_resident)
 52		ASSERT_OK(system("./uprobe_multi uprobe-paged-in"), "trigger_uprobe");
 53	else
 54		ASSERT_OK(system("./uprobe_multi uprobe-paged-out"), "trigger_uprobe");
 55
 56	if (!ASSERT_GT(skel->bss->res_nofault, 0, "res"))
 57		goto cleanup;
 58
 59	stack = skel->bss->stack_nofault;
 60	frame_cnt = skel->bss->res_nofault / sizeof(struct bpf_stack_build_id);
 61	if (env.verbosity >= VERBOSE_NORMAL)
 62		print_stack(stack, frame_cnt);
 63
 64	if (build_id_resident) {
 65		ASSERT_EQ(stack[0].status, BPF_STACK_BUILD_ID_VALID, "build_id_status");
 66		ASSERT_EQ(memcmp(stack[0].build_id, build_id, build_id_sz), 0, "build_id_match");
 67	} else {
 68		ASSERT_EQ(stack[0].status, BPF_STACK_BUILD_ID_IP, "build_id_status");
 69	}
 70
 71cleanup:
 72	test_build_id__destroy(skel);
 73}
 74
 75static void subtest_sleepable(void)
 76{
 77	struct test_build_id *skel;
 78	struct bpf_stack_build_id *stack;
 79	int frame_cnt;
 80
 81	skel = test_build_id__open_and_load();
 82	if (!ASSERT_OK_PTR(skel, "skel_open"))
 83		return;
 84
 85	skel->links.uprobe_sleepable = bpf_program__attach(skel->progs.uprobe_sleepable);
 86	if (!ASSERT_OK_PTR(skel->links.uprobe_sleepable, "link"))
 87		goto cleanup;
 88
 89	/* force build ID to not be paged in */
 90	ASSERT_OK(system("./uprobe_multi uprobe-paged-out"), "trigger_uprobe");
 91
 92	if (!ASSERT_GT(skel->bss->res_sleepable, 0, "res"))
 93		goto cleanup;
 94
 95	stack = skel->bss->stack_sleepable;
 96	frame_cnt = skel->bss->res_sleepable / sizeof(struct bpf_stack_build_id);
 97	if (env.verbosity >= VERBOSE_NORMAL)
 98		print_stack(stack, frame_cnt);
 99
100	ASSERT_EQ(stack[0].status, BPF_STACK_BUILD_ID_VALID, "build_id_status");
101	ASSERT_EQ(memcmp(stack[0].build_id, build_id, build_id_sz), 0, "build_id_match");
102
103cleanup:
104	test_build_id__destroy(skel);
105}
106
107void serial_test_build_id(void)
108{
109	build_id_sz = read_build_id("uprobe_multi", build_id, sizeof(build_id));
110	ASSERT_EQ(build_id_sz, BPF_BUILD_ID_SIZE, "parse_build_id");
111
112	if (test__start_subtest("nofault-paged-out"))
113		subtest_nofault(false /* not resident */);
114	if (test__start_subtest("nofault-paged-in"))
115		subtest_nofault(true /* resident */);
116	if (test__start_subtest("sleepable"))
117		subtest_sleepable();
118}