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Message-ID: <20250902143504.1224726-9-jolsa@kernel.org>
Date: Tue, 2 Sep 2025 16:35:01 +0200
From: Jiri Olsa <jolsa@...nel.org>
To: Oleg Nesterov <oleg@...hat.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Andrii Nakryiko <andrii@...nel.org>
Cc: bpf@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org,
x86@...nel.org,
Song Liu <songliubraving@...com>,
Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
Hao Luo <haoluo@...gle.com>,
Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...nel.org>
Subject: [PATCH perf/core 08/11] selftests/bpf: Add uprobe multi context registers changes test
Adding test to check we can change common register values through
uprobe program.
It's x86_64 specific test.
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
.../selftests/bpf/prog_tests/bpf_cookie.c | 1 +
.../bpf/prog_tests/uprobe_multi_test.c | 107 ++++++++++++++++++
.../selftests/bpf/progs/uprobe_multi.c | 24 ++++
3 files changed, 132 insertions(+)
diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
index 4a0670c056ba..2425fd26d1ea 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
@@ -6,6 +6,7 @@
#include <sys/syscall.h>
#include <sys/mman.h>
#include <unistd.h>
+#include <asm/ptrace.h>
#include <test_progs.h>
#include <network_helpers.h>
#include <bpf/btf.h>
diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
index 2ee17ef1dae2..012652b07399 100644
--- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c
@@ -2,6 +2,7 @@
#include <unistd.h>
#include <pthread.h>
+#include <asm/ptrace.h>
#include <test_progs.h>
#include "uprobe_multi.skel.h"
#include "uprobe_multi_bench.skel.h"
@@ -1340,6 +1341,111 @@ static void test_bench_attach_usdt(void)
printf("%s: detached in %7.3lfs\n", __func__, detach_delta);
}
+#ifdef __x86_64__
+__naked __maybe_unused unsigned long uprobe_regs_change_trigger(void)
+{
+ asm volatile (
+ "ret\n"
+ );
+}
+
+static __naked void uprobe_regs_change(struct pt_regs *before, struct pt_regs *after)
+{
+ asm volatile (
+ "movq %r11, 48(%rdi)\n"
+ "movq %r10, 56(%rdi)\n"
+ "movq %r9, 64(%rdi)\n"
+ "movq %r8, 72(%rdi)\n"
+ "movq %rax, 80(%rdi)\n"
+ "movq %rcx, 88(%rdi)\n"
+ "movq %rdx, 96(%rdi)\n"
+ "movq %rsi, 104(%rdi)\n"
+ "movq %rdi, 112(%rdi)\n"
+
+ /* save 2nd argument */
+ "pushq %rsi\n"
+ "call uprobe_regs_change_trigger\n"
+
+ /* save return value and load 2nd argument pointer to rax */
+ "pushq %rax\n"
+ "movq 8(%rsp), %rax\n"
+
+ "movq %r11, 48(%rax)\n"
+ "movq %r10, 56(%rax)\n"
+ "movq %r9, 64(%rax)\n"
+ "movq %r8, 72(%rax)\n"
+ "movq %rcx, 88(%rax)\n"
+ "movq %rdx, 96(%rax)\n"
+ "movq %rsi, 104(%rax)\n"
+ "movq %rdi, 112(%rax)\n"
+
+ /* restore return value and 2nd argument */
+ "pop %rax\n"
+ "pop %rsi\n"
+
+ "movq %rax, 80(%rsi)\n"
+ "ret\n"
+ );
+}
+
+static void unique_regs_common(void)
+{
+ struct pt_regs before = {}, after = {}, expected = {
+ .rax = 0xc0ffe,
+ .rcx = 0xbad,
+ .rdx = 0xdead,
+ .r8 = 0x8,
+ .r9 = 0x9,
+ .r10 = 0x10,
+ .r11 = 0x11,
+ .rdi = 0x12,
+ .rsi = 0x13,
+ };
+ LIBBPF_OPTS(bpf_uprobe_multi_opts, opts,
+ .unique = true,
+ );
+ struct uprobe_multi *skel;
+
+ skel = uprobe_multi__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "skel_open"))
+ return;
+
+ skel->bss->pid = getpid();
+ skel->bss->regs = expected;
+
+ skel->links.uprobe_change_regs = bpf_program__attach_uprobe_multi(
+ skel->progs.uprobe_change_regs,
+ -1, "/proc/self/exe",
+ "uprobe_regs_change_trigger",
+ &opts);
+ if (!ASSERT_OK_PTR(skel->links.uprobe_change_regs, "bpf_program__attach_uprobe_multi"))
+ goto cleanup;
+
+ uprobe_regs_change(&before, &after);
+
+ ASSERT_EQ(after.rax, expected.rax, "ax");
+ ASSERT_EQ(after.rcx, expected.rcx, "cx");
+ ASSERT_EQ(after.rdx, expected.rdx, "dx");
+ ASSERT_EQ(after.r8, expected.r8, "r8");
+ ASSERT_EQ(after.r9, expected.r9, "r9");
+ ASSERT_EQ(after.r10, expected.r10, "r10");
+ ASSERT_EQ(after.r11, expected.r11, "r11");
+ ASSERT_EQ(after.rdi, expected.rdi, "rdi");
+ ASSERT_EQ(after.rsi, expected.rsi, "rsi");
+
+cleanup:
+ uprobe_multi__destroy(skel);
+}
+
+static void test_unique(void)
+{
+ if (test__start_subtest("unique_regs_common"))
+ unique_regs_common();
+}
+#else
+static void test_unique(void) { }
+#endif
+
void test_uprobe_multi_test(void)
{
if (test__start_subtest("skel_api"))
@@ -1372,5 +1478,6 @@ void test_uprobe_multi_test(void)
test_session_cookie_skel_api();
if (test__start_subtest("session_cookie_recursive"))
test_session_recursive_skel_api();
+ test_unique();
RUN_TESTS(uprobe_multi_verifier);
}
diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi.c b/tools/testing/selftests/bpf/progs/uprobe_multi.c
index 44190efcdba2..f26f8b840985 100644
--- a/tools/testing/selftests/bpf/progs/uprobe_multi.c
+++ b/tools/testing/selftests/bpf/progs/uprobe_multi.c
@@ -141,3 +141,27 @@ int usdt_extra(struct pt_regs *ctx)
/* we need this one just to mix PID-filtered and global USDT probes */
return 0;
}
+
+#if defined(__TARGET_ARCH_x86)
+struct pt_regs regs;
+
+SEC("uprobe.unique")
+int BPF_UPROBE(uprobe_change_regs)
+{
+ pid_t cur_pid = bpf_get_current_pid_tgid() >> 32;
+
+ if (cur_pid != pid)
+ return 0;
+
+ ctx->ax = regs.ax;
+ ctx->cx = regs.cx;
+ ctx->dx = regs.dx;
+ ctx->r8 = regs.r8;
+ ctx->r9 = regs.r9;
+ ctx->r10 = regs.r10;
+ ctx->r11 = regs.r11;
+ ctx->di = regs.di;
+ ctx->si = regs.si;
+ return 0;
+}
+#endif
--
2.51.0
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