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selftests/bpf: Add bpf_get_func_ip test for uprobe inside function

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

Tested-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20230807085956.2344866-4-jolsa@kernel.org
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Jiri Olsa 2023-08-07 10:59:56 +02:00 committed by Martin KaFai Lau
parent e43163ed1c
commit 7febf573a5
2 changed files with 60 additions and 4 deletions
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46
tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c
View file

@ -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

18
tools/testing/selftests/bpf/progs/get_func_ip_uprobe_test.c Normal file
View file

@ -0,0 +1,18 @@
// 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;
}