From: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
To: linux-trace-kernel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
Steven Rostedt <rostedt@goodmis.org>,
mhiramat@kernel.org, Florent Revest <revest@chromium.org>,
Mark Rutland <mark.rutland@arm.com>,
Will Deacon <will@kernel.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Martin KaFai Lau <martin.lau@linux.dev>,
bpf@vger.kernel.org, Bagas Sanjaya <bagasdotme@gmail.com>
Subject: [PATCH v13 01/12] fprobe: Pass return address to the handlers
Date: Fri, 26 May 2023 12:17:56 +0800 [thread overview]
Message-ID: <168507467664.913472.11642316698862778600.stgit@mhiramat.roam.corp.google.com> (raw)
In-Reply-To: <168507466597.913472.10572827237387849017.stgit@mhiramat.roam.corp.google.com>
From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Pass return address as 'ret_ip' to the fprobe entry and return handlers
so that the fprobe user handler can get the reutrn address without
analyzing arch-dependent pt_regs.
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
Changes in v10:
- Add the reason why this requires in patch description.
---
include/linux/fprobe.h | 6 ++++--
include/linux/rethook.h | 2 +-
kernel/kprobes.c | 1 +
kernel/trace/bpf_trace.c | 6 ++++--
kernel/trace/fprobe.c | 6 +++---
kernel/trace/rethook.c | 3 ++-
lib/test_fprobe.c | 10 +++++++---
samples/fprobe/fprobe_example.c | 6 ++++--
8 files changed, 26 insertions(+), 14 deletions(-)
diff --git a/include/linux/fprobe.h b/include/linux/fprobe.h
index 47fefc7f363b..134f0f59ffa8 100644
--- a/include/linux/fprobe.h
+++ b/include/linux/fprobe.h
@@ -35,9 +35,11 @@ struct fprobe {
int nr_maxactive;
int (*entry_handler)(struct fprobe *fp, unsigned long entry_ip,
- struct pt_regs *regs, void *entry_data);
+ unsigned long ret_ip, struct pt_regs *regs,
+ void *entry_data);
void (*exit_handler)(struct fprobe *fp, unsigned long entry_ip,
- struct pt_regs *regs, void *entry_data);
+ unsigned long ret_ip, struct pt_regs *regs,
+ void *entry_data);
};
/* This fprobe is soft-disabled. */
diff --git a/include/linux/rethook.h b/include/linux/rethook.h
index c8ac1e5afcd1..fdf26cd0e742 100644
--- a/include/linux/rethook.h
+++ b/include/linux/rethook.h
@@ -14,7 +14,7 @@
struct rethook_node;
-typedef void (*rethook_handler_t) (struct rethook_node *, void *, struct pt_regs *);
+typedef void (*rethook_handler_t) (struct rethook_node *, void *, unsigned long, struct pt_regs *);
/**
* struct rethook - The rethook management data structure.
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 00e177de91cc..ce13f1a35251 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -2127,6 +2127,7 @@ static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs)
NOKPROBE_SYMBOL(pre_handler_kretprobe);
static void kretprobe_rethook_handler(struct rethook_node *rh, void *data,
+ unsigned long ret_addr,
struct pt_regs *regs)
{
struct kretprobe *rp = (struct kretprobe *)data;
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index d804172b709c..c0a32118f08f 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -2646,7 +2646,8 @@ kprobe_multi_link_prog_run(struct bpf_kprobe_multi_link *link,
static int
kprobe_multi_link_handler(struct fprobe *fp, unsigned long fentry_ip,
- struct pt_regs *regs, void *data)
+ unsigned long ret_ip, struct pt_regs *regs,
+ void *data)
{
struct bpf_kprobe_multi_link *link;
@@ -2657,7 +2658,8 @@ kprobe_multi_link_handler(struct fprobe *fp, unsigned long fentry_ip,
static void
kprobe_multi_link_exit_handler(struct fprobe *fp, unsigned long fentry_ip,
- struct pt_regs *regs, void *data)
+ unsigned long ret_ip, struct pt_regs *regs,
+ void *data)
{
struct bpf_kprobe_multi_link *link;
diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c
index 9abb3905bc8e..973bc664fcc1 100644
--- a/kernel/trace/fprobe.c
+++ b/kernel/trace/fprobe.c
@@ -52,7 +52,7 @@ static void fprobe_handler(unsigned long ip, unsigned long parent_ip,
}
if (fp->entry_handler)
- ret = fp->entry_handler(fp, ip, ftrace_get_regs(fregs), entry_data);
+ ret = fp->entry_handler(fp, ip, parent_ip, ftrace_get_regs(fregs), entry_data);
/* If entry_handler returns !0, nmissed is not counted. */
if (rh) {
@@ -81,7 +81,7 @@ static void fprobe_kprobe_handler(unsigned long ip, unsigned long parent_ip,
}
static void fprobe_exit_handler(struct rethook_node *rh, void *data,
- struct pt_regs *regs)
+ unsigned long ret_ip, struct pt_regs *regs)
{
struct fprobe *fp = (struct fprobe *)data;
struct fprobe_rethook_node *fpr;
@@ -91,7 +91,7 @@ static void fprobe_exit_handler(struct rethook_node *rh, void *data,
fpr = container_of(rh, struct fprobe_rethook_node, node);
- fp->exit_handler(fp, fpr->entry_ip, regs,
+ fp->exit_handler(fp, fpr->entry_ip, ret_ip, regs,
fp->entry_data_size ? (void *)fpr->data : NULL);
}
NOKPROBE_SYMBOL(fprobe_exit_handler);
diff --git a/kernel/trace/rethook.c b/kernel/trace/rethook.c
index 32c3dfdb4d6a..fc196e186737 100644
--- a/kernel/trace/rethook.c
+++ b/kernel/trace/rethook.c
@@ -301,7 +301,8 @@ unsigned long rethook_trampoline_handler(struct pt_regs *regs,
break;
handler = READ_ONCE(rhn->rethook->handler);
if (handler)
- handler(rhn, rhn->rethook->data, regs);
+ handler(rhn, rhn->rethook->data,
+ correct_ret_addr, regs);
if (first == node)
break;
diff --git a/lib/test_fprobe.c b/lib/test_fprobe.c
index 0fe5273e960b..ade7e3d93dac 100644
--- a/lib/test_fprobe.c
+++ b/lib/test_fprobe.c
@@ -39,7 +39,8 @@ static noinline u32 fprobe_selftest_nest_target(u32 value, u32 (*nest)(u32))
}
static notrace int fp_entry_handler(struct fprobe *fp, unsigned long ip,
- struct pt_regs *regs, void *data)
+ unsigned long ret_ip,
+ struct pt_regs *regs, void *data)
{
KUNIT_EXPECT_FALSE(current_test, preemptible());
/* This can be called on the fprobe_selftest_target and the fprobe_selftest_target2 */
@@ -57,6 +58,7 @@ static notrace int fp_entry_handler(struct fprobe *fp, unsigned long ip,
}
static notrace void fp_exit_handler(struct fprobe *fp, unsigned long ip,
+ unsigned long ret_ip,
struct pt_regs *regs, void *data)
{
unsigned long ret = regs_return_value(regs);
@@ -78,14 +80,16 @@ static notrace void fp_exit_handler(struct fprobe *fp, unsigned long ip,
}
static notrace int nest_entry_handler(struct fprobe *fp, unsigned long ip,
- struct pt_regs *regs, void *data)
+ unsigned long ret_ip,
+ struct pt_regs *regs, void *data)
{
KUNIT_EXPECT_FALSE(current_test, preemptible());
return 0;
}
static notrace void nest_exit_handler(struct fprobe *fp, unsigned long ip,
- struct pt_regs *regs, void *data)
+ unsigned long ret_ip,
+ struct pt_regs *regs, void *data)
{
KUNIT_EXPECT_FALSE(current_test, preemptible());
KUNIT_EXPECT_EQ(current_test, ip, target_nest_ip);
diff --git a/samples/fprobe/fprobe_example.c b/samples/fprobe/fprobe_example.c
index 4efc8feb6277..64e715e7ed11 100644
--- a/samples/fprobe/fprobe_example.c
+++ b/samples/fprobe/fprobe_example.c
@@ -49,6 +49,7 @@ static void show_backtrace(void)
}
static int sample_entry_handler(struct fprobe *fp, unsigned long ip,
+ unsigned long ret_ip,
struct pt_regs *regs, void *data)
{
if (use_trace)
@@ -65,10 +66,11 @@ static int sample_entry_handler(struct fprobe *fp, unsigned long ip,
return 0;
}
-static void sample_exit_handler(struct fprobe *fp, unsigned long ip, struct pt_regs *regs,
+static void sample_exit_handler(struct fprobe *fp, unsigned long ip,
+ unsigned long ret_ip, struct pt_regs *regs,
void *data)
{
- unsigned long rip = instruction_pointer(regs);
+ unsigned long rip = ret_ip;
if (use_trace)
/*
next prev parent reply other threads:[~2023-05-26 4:18 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-26 4:17 [PATCH v13 00/12] tracing: Add fprobe/tracepoint events Masami Hiramatsu (Google)
2023-05-26 4:17 ` Masami Hiramatsu (Google) [this message]
2023-05-26 4:18 ` [PATCH v13 02/12] tracing/probes: Avoid setting TPARG_FL_FENTRY and TPARG_FL_RETURN Masami Hiramatsu (Google)
2023-05-26 4:18 ` [PATCH v13 03/12] tracing/probes: Add fprobe events for tracing function entry and exit Masami Hiramatsu (Google)
2023-05-26 19:38 ` Florent Revest
2023-05-29 3:16 ` Masami Hiramatsu
2023-05-26 4:18 ` [PATCH v13 04/12] selftests/ftrace: Add fprobe related testcases Masami Hiramatsu (Google)
2023-05-26 4:18 ` [PATCH v13 05/12] tracing/probes: Add tracepoint support on fprobe_events Masami Hiramatsu (Google)
2023-05-26 4:18 ` [PATCH v13 06/12] tracing/probes: Move event parameter fetching code to common parser Masami Hiramatsu (Google)
2023-05-26 4:19 ` [PATCH v13 07/12] tracing/probes: Support function parameters if BTF is available Masami Hiramatsu (Google)
2023-05-26 4:19 ` [PATCH v13 08/12] tracing/probes: Add $arg* meta argument for all function args Masami Hiramatsu (Google)
2023-05-26 4:19 ` [PATCH v13 09/12] tracing/probes: Add BTF retval type support Masami Hiramatsu (Google)
2023-06-12 7:29 ` Donglin Peng
2023-07-07 14:12 ` Masami Hiramatsu
2023-05-26 4:19 ` [PATCH v13 10/12] selftests/ftrace: Add tracepoint probe test case Masami Hiramatsu (Google)
2023-05-26 4:19 ` [PATCH v13 11/12] selftests/ftrace: Add BTF arguments test cases Masami Hiramatsu (Google)
2023-05-26 4:19 ` [PATCH v13 12/12] Documentation: tracing/probes: Add fprobe event tracing document Masami Hiramatsu (Google)
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