Commit 7febf573 authored by Jiri Olsa's avatar Jiri Olsa Committed by Martin KaFai Lau
Browse files

selftests/bpf: Add bpf_get_func_ip test for uprobe inside function 



Adding get_func_ip test for uprobe inside function that validates
the get_func_ip helper returns correct probe address value.

Tested-by: default avatarAlan Maguire <alan.maguire@oracle.com>
Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Acked-by: default avatarYonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20230807085956.2344866-4-jolsa@kernel.org


Signed-off-by: default avatarMartin KaFai Lau <martin.lau@kernel.org>
parent e43163ed

tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c

+42 −4
Original line number Diff line number Diff line
@@ -51,11 +51,17 @@ static void test_function_entry(void) 
	get_func_ip_test__destroy(skel);

}



/* test6 is x86_64 specific because of the instruction

 * offset, disabling it for all other archs

 */

#ifdef __x86_64__

static void test_function_body(void)

extern void uprobe_trigger_body(void);

asm(

".globl uprobe_trigger_body\n"

".type uprobe_trigger_body, @function\n"

"uprobe_trigger_body:\n"

"	nop\n"

"	ret\n"

);



static void test_function_body_kprobe(void)

{

	struct get_func_ip_test *skel = NULL;

	LIBBPF_OPTS(bpf_test_run_opts, topts);
@@ -67,6 +73,9 @@ static void test_function_body(void) 
	if (!ASSERT_OK_PTR(skel, "get_func_ip_test__open"))

		return;



	/* test6 is x86_64 specific and is disabled by default,

	 * enable it for body test.

	 */

	bpf_program__set_autoload(skel->progs.test6, true);



	err = get_func_ip_test__load(skel);
@@ -90,6 +99,35 @@ static void test_function_body(void) 
	bpf_link__destroy(link6);

	get_func_ip_test__destroy(skel);

}



static void test_function_body_uprobe(void)

{

	struct get_func_ip_uprobe_test *skel = NULL;

	int err;



	skel = get_func_ip_uprobe_test__open_and_load();

	if (!ASSERT_OK_PTR(skel, "get_func_ip_uprobe_test__open_and_load"))

		return;



	err = get_func_ip_uprobe_test__attach(skel);

	if (!ASSERT_OK(err, "get_func_ip_test__attach"))

		goto cleanup;



	skel->bss->uprobe_trigger_body = (unsigned long) uprobe_trigger_body;



	uprobe_trigger_body();



	ASSERT_EQ(skel->bss->test1_result, 1, "test1_result");



cleanup:

	get_func_ip_uprobe_test__destroy(skel);

}



static void test_function_body(void)

{

	test_function_body_kprobe();

	test_function_body_uprobe();

}

#else

#define test_function_body()

#endif

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

0 → 100644
+18 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include "vmlinux.h"

#include <bpf/bpf_helpers.h>

#include <bpf/bpf_tracing.h>



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



unsigned long uprobe_trigger_body;



__u64 test1_result = 0;

SEC("uprobe//proc/self/exe:uprobe_trigger_body+1")

int BPF_UPROBE(test1)

{

	__u64 addr = bpf_get_func_ip(ctx);



	test1_result = (const void *) addr == (const void *) uprobe_trigger_body + 1;

	return 0;

}