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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
#include <test_progs.h>
#include "test_build_id.skel.h"
static char build_id[BPF_BUILD_ID_SIZE];
static int build_id_sz;
static void print_stack(struct bpf_stack_build_id *stack, int frame_cnt)
{
int i, j;
for (i = 0; i < frame_cnt; i++) {
printf("FRAME #%02d: ", i);
switch (stack[i].status) {
case BPF_STACK_BUILD_ID_EMPTY:
printf("<EMPTY>\n");
break;
case BPF_STACK_BUILD_ID_VALID:
printf("BUILD ID = ");
for (j = 0; j < BPF_BUILD_ID_SIZE; j++)
printf("%02hhx", (unsigned)stack[i].build_id[j]);
printf(" OFFSET = %llx", (unsigned long long)stack[i].offset);
break;
case BPF_STACK_BUILD_ID_IP:
printf("IP = %llx", (unsigned long long)stack[i].ip);
break;
default:
printf("UNEXPECTED STATUS %d ", stack[i].status);
break;
}
printf("\n");
}
}
static void subtest_nofault(bool build_id_resident)
{
struct test_build_id *skel;
struct bpf_stack_build_id *stack;
int frame_cnt;
skel = test_build_id__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return;
skel->links.uprobe_nofault = bpf_program__attach(skel->progs.uprobe_nofault);
if (!ASSERT_OK_PTR(skel->links.uprobe_nofault, "link"))
goto cleanup;
if (build_id_resident)
ASSERT_OK(system("./uprobe_multi uprobe-paged-in"), "trigger_uprobe");
else
ASSERT_OK(system("./uprobe_multi uprobe-paged-out"), "trigger_uprobe");
if (!ASSERT_GT(skel->bss->res_nofault, 0, "res"))
goto cleanup;
stack = skel->bss->stack_nofault;
frame_cnt = skel->bss->res_nofault / sizeof(struct bpf_stack_build_id);
if (env.verbosity >= VERBOSE_NORMAL)
print_stack(stack, frame_cnt);
if (build_id_resident) {
ASSERT_EQ(stack[0].status, BPF_STACK_BUILD_ID_VALID, "build_id_status");
ASSERT_EQ(memcmp(stack[0].build_id, build_id, build_id_sz), 0, "build_id_match");
} else {
ASSERT_EQ(stack[0].status, BPF_STACK_BUILD_ID_IP, "build_id_status");
}
cleanup:
test_build_id__destroy(skel);
}
static void subtest_sleepable(void)
{
struct test_build_id *skel;
struct bpf_stack_build_id *stack;
int frame_cnt;
skel = test_build_id__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return;
skel->links.uprobe_sleepable = bpf_program__attach(skel->progs.uprobe_sleepable);
if (!ASSERT_OK_PTR(skel->links.uprobe_sleepable, "link"))
goto cleanup;
/* force build ID to not be paged in */
ASSERT_OK(system("./uprobe_multi uprobe-paged-out"), "trigger_uprobe");
if (!ASSERT_GT(skel->bss->res_sleepable, 0, "res"))
goto cleanup;
stack = skel->bss->stack_sleepable;
frame_cnt = skel->bss->res_sleepable / sizeof(struct bpf_stack_build_id);
if (env.verbosity >= VERBOSE_NORMAL)
print_stack(stack, frame_cnt);
ASSERT_EQ(stack[0].status, BPF_STACK_BUILD_ID_VALID, "build_id_status");
ASSERT_EQ(memcmp(stack[0].build_id, build_id, build_id_sz), 0, "build_id_match");
cleanup:
test_build_id__destroy(skel);
}
void serial_test_build_id(void)
{
build_id_sz = read_build_id("uprobe_multi", build_id, sizeof(build_id));
ASSERT_EQ(build_id_sz, BPF_BUILD_ID_SIZE, "parse_build_id");
if (test__start_subtest("nofault-paged-out"))
subtest_nofault(false /* not resident */);
if (test__start_subtest("nofault-paged-in"))
subtest_nofault(true /* resident */);
if (test__start_subtest("sleepable"))
subtest_sleepable();
}
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