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From: Masami Hiramatsu <mhiramat@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>, linux-kernel@vger.kernel.org
Cc: mhiramat@kernel.org, Ingo Molnar <mingo@redhat.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Tom Zanussi <tom.zanussi@linux.intel.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	linux-trace-users@vger.kernel.org,
	linux-kselftest@vger.kernel.org, shuah@kernel.org,
	Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Subject: [PATCH v6 12/21] tracing: probeevent: Unify fetch_insn processing common part
Date: Sat, 17 Mar 2018 21:46:25 +0900
Message-ID: <152129078491.31874.6052619718602591149.stgit@devbox> (raw)
In-Reply-To: <152129024033.31874.15800253385376959274.stgit@devbox>

Unify the fetch_insn bottom process (from stage 2: dereference
indirect data) from kprobe and uprobe events, since those are
mostly same.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 kernel/trace/trace_kprobe.c     |   47 +++++----------------------------
 kernel/trace/trace_probe_tmpl.h |   55 ++++++++++++++++++++++++++++++++++++++-
 kernel/trace/trace_uprobe.c     |   43 +-----------------------------
 3 files changed, 63 insertions(+), 82 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 7d48ae5f0617..b564d38810b7 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -857,13 +857,18 @@ fetch_store_string(unsigned long addr, void *dest, void *base)
 	return ret;
 }
 
+static nokprobe_inline int
+probe_mem_read(void *dest, void *src, size_t size)
+{
+	return probe_kernel_read(dest, src, size);
+}
+
 /* Note that we don't verify it, since the code does not come from user space */
 static int
 process_fetch_insn(struct fetch_insn *code, struct pt_regs *regs, void *dest,
 		   void *base)
 {
 	unsigned long val;
-	int ret = 0;
 
 	/* 1st stage: get value from context */
 	switch (code->op) {
@@ -890,45 +895,7 @@ process_fetch_insn(struct fetch_insn *code, struct pt_regs *regs, void *dest,
 	}
 	code++;
 
-	/* 2nd stage: dereference memory if needed */
-	while (code->op == FETCH_OP_DEREF) {
-		ret = probe_kernel_read(&val, (void *)val + code->offset,
-					sizeof(val));
-		if (ret)
-			return ret;
-		code++;
-	}
-
-	/* 3rd stage: store value to buffer */
-	if (unlikely(!dest)) {
-		if (code->op == FETCH_OP_ST_STRING)
-			return fetch_store_strlen(val + code->offset);
-		else
-			return -EILSEQ;
-	}
-
-	switch (code->op) {
-	case FETCH_OP_ST_RAW:
-		fetch_store_raw(val, code, dest);
-		break;
-	case FETCH_OP_ST_MEM:
-		probe_kernel_read(dest, (void *)val + code->offset, code->size);
-		break;
-	case FETCH_OP_ST_STRING:
-		ret = fetch_store_string(val + code->offset, dest, base);
-		break;
-	default:
-		return -EILSEQ;
-	}
-	code++;
-
-	/* 4th stage: modify stored value if needed */
-	if (code->op == FETCH_OP_MOD_BF) {
-		fetch_apply_bitfield(code, dest);
-		code++;
-	}
-
-	return code->op == FETCH_OP_END ? ret : -EILSEQ;
+	return process_fetch_insn_bottom(code, val, dest, base);
 }
 NOKPROBE_SYMBOL(process_fetch_insn)
 
diff --git a/kernel/trace/trace_probe_tmpl.h b/kernel/trace/trace_probe_tmpl.h
index d9aebd395a9d..32ae2fc78190 100644
--- a/kernel/trace/trace_probe_tmpl.h
+++ b/kernel/trace/trace_probe_tmpl.h
@@ -49,13 +49,66 @@ fetch_apply_bitfield(struct fetch_insn *code, void *buf)
 }
 
 /*
- * This must be defined for each callsite.
+ * These functions must be defined for each callsite.
  * Return consumed dynamic data size (>= 0), or error (< 0).
  * If dest is NULL, don't store result and return required dynamic data size.
  */
 static int
 process_fetch_insn(struct fetch_insn *code, struct pt_regs *regs,
 		   void *dest, void *base);
+static nokprobe_inline int fetch_store_strlen(unsigned long addr);
+static nokprobe_inline int
+fetch_store_string(unsigned long addr, void *dest, void *base);
+static nokprobe_inline int
+probe_mem_read(void *dest, void *src, size_t size);
+
+/* From the 2nd stage, routine is same */
+static nokprobe_inline int
+process_fetch_insn_bottom(struct fetch_insn *code, unsigned long val,
+			   void *dest, void *base)
+{
+	int ret = 0;
+
+	/* 2nd stage: dereference memory if needed */
+	while (code->op == FETCH_OP_DEREF) {
+		ret = probe_mem_read(&val, (void *)val + code->offset,
+					sizeof(val));
+		if (ret)
+			return ret;
+		code++;
+	}
+
+	/* 3rd stage: store value to buffer */
+	if (unlikely(!dest)) {
+		if (code->op == FETCH_OP_ST_STRING)
+			return fetch_store_strlen(val + code->offset);
+		else
+			return -EILSEQ;
+	}
+
+	switch (code->op) {
+	case FETCH_OP_ST_RAW:
+		fetch_store_raw(val, code, dest);
+		break;
+	case FETCH_OP_ST_MEM:
+		probe_mem_read(dest, (void *)val + code->offset, code->size);
+		break;
+	case FETCH_OP_ST_STRING:
+		ret = fetch_store_string(val + code->offset, dest, base);
+		break;
+	default:
+		return -EILSEQ;
+	}
+	code++;
+
+	/* 4th stage: modify stored value if needed */
+	if (code->op == FETCH_OP_MOD_BF) {
+		fetch_apply_bitfield(code, dest);
+		code++;
+	}
+
+	return code->op == FETCH_OP_END ? ret : -EILSEQ;
+}
 
 /* Sum up total data length for dynamic arraies (strings) */
 static nokprobe_inline int
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index fafd48310823..64c1fbe087a1 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -111,7 +111,7 @@ static unsigned long get_user_stack_nth(struct pt_regs *regs, unsigned int n)
  * Uprobes-specific fetch functions
  */
 static nokprobe_inline int
-probe_user_read(void *dest, void *src, size_t size)
+probe_mem_read(void *dest, void *src, size_t size)
 {
 	void __user *vaddr = (void __force __user *)src;
 
@@ -172,7 +172,6 @@ process_fetch_insn(struct fetch_insn *code, struct pt_regs *regs, void *dest,
 		   void *base)
 {
 	unsigned long val;
-	int ret = 0;
 
 	/* 1st stage: get value from context */
 	switch (code->op) {
@@ -199,45 +198,7 @@ process_fetch_insn(struct fetch_insn *code, struct pt_regs *regs, void *dest,
 	}
 	code++;
 
-	/* 2nd stage: dereference memory if needed */
-	while (code->op == FETCH_OP_DEREF) {
-		ret = probe_user_read(&val, (void *)val + code->offset,
-				      sizeof(val));
-		if (ret)
-			return ret;
-		code++;
-	}
-
-	/* 3rd stage: store value to buffer */
-	if (unlikely(!dest)) {
-		if (code->op == FETCH_OP_ST_STRING)
-			return fetch_store_strlen(val + code->offset);
-		else
-			return -EILSEQ;
-	}
-
-	switch (code->op) {
-	case FETCH_OP_ST_RAW:
-		fetch_store_raw(val, code, dest);
-		break;
-	case FETCH_OP_ST_MEM:
-		probe_kernel_read(dest, (void *)val + code->offset, code->size);
-		break;
-	case FETCH_OP_ST_STRING:
-		ret = fetch_store_string(val + code->offset, dest, base);
-		break;
-	default:
-		return -EILSEQ;
-	}
-	code++;
-
-	/* 4th stage: modify stored value if needed */
-	if (code->op == FETCH_OP_MOD_BF) {
-		fetch_apply_bitfield(code, dest);
-		code++;
-	}
-
-	return code->op == FETCH_OP_END ? ret : -EILSEQ;
+	return process_fetch_insn_bottom(code, val, dest, base);
 }
 NOKPROBE_SYMBOL(process_fetch_insn)
 


  parent reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-17 12:37 [PATCH v6 00/21] tracing: probeevent: Improve fetcharg features Masami Hiramatsu
2018-03-17 12:38 ` [PATCH v6 01/21] [BUGFIX] tracing: probeevent: Fix to support minus offset from symbol Masami Hiramatsu
2018-03-17 12:38 ` [PATCH v6 02/21] selftests: ftrace: Add probe event argument syntax testcase Masami Hiramatsu
2018-03-17 12:39 ` [PATCH v6 03/21] selftests: ftrace: Add a testcase for string type with kprobe_event Masami Hiramatsu
2018-03-17 12:40 ` [PATCH v6 04/21] selftests: ftrace: Add a testcase for probepoint Masami Hiramatsu
2018-03-23 16:19   ` Steven Rostedt
2018-03-17 12:41 ` [PATCH v6 05/21] tracing: probeevent: Cleanup print argument functions Masami Hiramatsu
2018-03-23 16:36   ` Steven Rostedt
2018-03-26  4:17     ` Masami Hiramatsu
2018-03-26 17:28       ` Steven Rostedt
2018-03-28  4:21         ` Masami Hiramatsu
2018-03-17 12:41 ` [PATCH v6 06/21] tracing: probeevent: Cleanup argument field definition Masami Hiramatsu
2018-03-17 12:42 ` [PATCH v6 07/21] tracing: probeevent: Remove NOKPROBE_SYMBOL from print functions Masami Hiramatsu
2018-03-17 12:43 ` [PATCH v6 08/21] tracing: probeevent: Introduce new argument fetching code Masami Hiramatsu
2018-03-17 12:44 ` [PATCH v6 09/21] tracing: probeevent: Unify fetch type tables Masami Hiramatsu
2018-03-17 12:44 ` [PATCH v6 10/21] tracing: probeevent: Return consumed bytes of dynamic area Masami Hiramatsu
2018-04-02 20:02   ` Steven Rostedt
2018-04-03 14:41     ` Masami Hiramatsu
2018-03-17 12:45 ` [PATCH v6 11/21] tracing: probeevent: Append traceprobe_ for exported function Masami Hiramatsu
2018-03-17 12:46 ` Masami Hiramatsu [this message]
2018-03-17 12:47 ` [PATCH v6 13/21] tracing: probeevent: Add symbol type Masami Hiramatsu
2018-03-17 12:47 ` [PATCH v6 14/21] x86: ptrace: Add function argument access API Masami Hiramatsu
2018-03-17 12:48 ` [PATCH v6 15/21] tracing: probeevent: Add $argN for accessing function args Masami Hiramatsu
2018-03-17 12:49 ` [PATCH v6 16/21] tracing: probeevent: Add array type support Masami Hiramatsu
2018-03-17 12:50 ` [PATCH v6 17/21] selftests: ftrace: Add a testcase for symbol type Masami Hiramatsu
2018-03-17 12:50 ` [PATCH v6 18/21] selftests: ftrace: Add a testcase for $argN with kprobe_event Masami Hiramatsu
2018-03-17 12:51 ` [PATCH v6 19/21] selftests: ftrace: Add a testcase for array type " Masami Hiramatsu
2018-03-17 12:53 ` [PATCH v6 21/21] perf-probe: Add array argument support Masami Hiramatsu
2018-03-19  7:59   ` Ravi Bangoria
2018-03-22 10:23     ` Masami Hiramatsu
2018-03-22 10:49       ` Ravi Bangoria
2018-03-26  3:53         ` Masami Hiramatsu
2018-03-17 14:06 ` [PATCH v6 00/21] tracing: probeevent: Improve fetcharg features Masami Hiramatsu
2018-03-17 12:52 [PATCH v6 20/21] [RESEND] perf-probe: Fix to convert array type collectly Masami Hiramatsu
2018-03-20  6:36 ` [tip:perf/core] perf probe: Use right type to access array elements tip-bot for Masami Hiramatsu

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