tools/testing/selftests/bpf/progs/tracing_multi_check.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/tracing_multi_check.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/tracing_multi_check.c
Extension
.c
Size
5567 bytes
Lines
215
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

char _license[] SEC("license") = "GPL";

int pid = 0;
bool test_cookies = false;

/* bpf_fentry_test1 is exported as kfunc via vmlinux.h */
extern const void bpf_fentry_test2 __ksym;
extern const void bpf_fentry_test3 __ksym;
extern const void bpf_fentry_test4 __ksym;
extern const void bpf_fentry_test5 __ksym;
extern const void bpf_fentry_test6 __ksym;
extern const void bpf_fentry_test7 __ksym;
extern const void bpf_fentry_test8 __ksym;
extern const void bpf_fentry_test9 __ksym;
extern const void bpf_fentry_test10 __ksym;

extern const void bpf_testmod_fentry_test1 __ksym;
extern const void bpf_testmod_fentry_test2 __ksym;
extern const void bpf_testmod_fentry_test3 __ksym;
extern const void bpf_testmod_fentry_test7 __ksym;
extern const void bpf_testmod_fentry_test11 __ksym;

int tracing_multi_arg_check(__u64 *ctx, __u64 *test_result, bool is_return)
{
	void *ip = (void *) bpf_get_func_ip(ctx);
	__u64 value = 0, ret = 0, cookie = 0;
	long err = 0;

	if (bpf_get_current_pid_tgid() >> 32 != pid)
		return 1;

	if (is_return)
		err |= bpf_get_func_ret(ctx, &ret);
	if (test_cookies)
		cookie = bpf_get_attach_cookie(ctx);

	if (ip == &bpf_fentry_test1) {
		int a;

		err |= bpf_get_func_arg(ctx, 0, &value);
		a = (int) value;

		err |= is_return ? ret != 2 : 0;
		err |= test_cookies ? cookie != 8 : 0;

		*test_result += err == 0 && a == 1;
	} else if (ip == &bpf_fentry_test2) {
		__u64 b;
		int a;

		err |= bpf_get_func_arg(ctx, 0, &value);
		a = (int) value;
		err |= bpf_get_func_arg(ctx, 1, &value);
		b = value;

		err |= is_return ? ret != 5 : 0;
		err |= test_cookies ? cookie != 9 : 0;

		*test_result += err == 0 && a == 2 && b == 3;
	} else if (ip == &bpf_fentry_test3) {
		__u64 c;
		char a;
		int b;

		err |= bpf_get_func_arg(ctx, 0, &value);
		a = (char) value;
		err |= bpf_get_func_arg(ctx, 1, &value);
		b = (int) value;
		err |= bpf_get_func_arg(ctx, 2, &value);
		c = value;

		err |= is_return ? ret != 15 : 0;
		err |= test_cookies ? cookie != 7 : 0;

		*test_result += err == 0 && a == 4 && b == 5 && c == 6;
	} else if (ip == &bpf_fentry_test4) {
		void *a;
		char b;
		int c;
		__u64 d;

		err |= bpf_get_func_arg(ctx, 0, &value);
		a = (void *) value;
		err |= bpf_get_func_arg(ctx, 1, &value);
		b = (char) value;

Annotation

Implementation Notes