linux-kernel - [PATCH v4 01/15] perf tools: Add utility function to fetch executable

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Message-Id: <20190305144758.12397-2-andi@firstfloor.org>
Date:   Tue,  5 Mar 2019 06:47:44 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     acme@...nel.org
Cc:     jolsa@...nel.org, namhyung@...nel.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH v4 01/15] perf tools: Add utility function to fetch executable

From: Andi Kleen <ak@...ux.intel.com>

Add a utility function to fetch executable code. Convert one
user over to it. There are more places doing that, but they
do significantly different actions, so they are not
easy to fit into a single library function.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/util/Build       |  1 +
 tools/perf/util/fetch.c     | 28 ++++++++++++++++++++++++++++
 tools/perf/util/fetch.h     |  7 +++++++
 tools/perf/util/intel-bts.c | 21 +++------------------
 4 files changed, 39 insertions(+), 18 deletions(-)
 create mode 100644 tools/perf/util/fetch.c
 create mode 100644 tools/perf/util/fetch.h

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 8dd3102301ea..649321fc3fb9 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -65,6 +65,7 @@ perf-y += trace-event-scripting.o
 perf-y += trace-event.o
 perf-y += svghelper.o
 perf-y += sort.o
+perf-y += fetch.o
 perf-y += hist.o
 perf-y += util.o
 perf-y += xyarray.o
diff --git a/tools/perf/util/fetch.c b/tools/perf/util/fetch.c
new file mode 100644
index 000000000000..1430083e7eca
--- /dev/null
+++ b/tools/perf/util/fetch.c
@@ -0,0 +1,28 @@
+#include "perf.h"
+#include "machine.h"
+#include "thread.h"
+#include "symbol.h"
+#include "map.h"
+#include "fetch.h"
+
+int fetch_exe(u64 ip, struct thread *thread, struct machine *machine,
+	      char *buf, int len, bool *is64bit)
+{
+	struct addr_location al;
+	u8 cpumode;
+	long offset;
+
+	if (machine__kernel_ip(machine, ip))
+		cpumode = PERF_RECORD_MISC_KERNEL;
+	else
+		cpumode = PERF_RECORD_MISC_USER;
+	if (!thread__find_map(thread, cpumode, ip, &al) || !al.map->dso)
+		return -1;
+	if (al.map->dso->data.status == DSO_DATA_STATUS_ERROR)
+		return -1;
+	map__load(al.map);
+	offset = al.map->map_ip(al.map, ip);
+	if (is64bit)
+		*is64bit = al.map->dso->is_64_bit;
+	return dso__data_read_offset(al.map->dso, machine, offset, (u8 *)buf, len);
+}
diff --git a/tools/perf/util/fetch.h b/tools/perf/util/fetch.h
new file mode 100644
index 000000000000..7b77b8cee55a
--- /dev/null
+++ b/tools/perf/util/fetch.h
@@ -0,0 +1,7 @@
+#ifndef FETCH_H
+#define FETCH_H 1
+
+int fetch_exe(u64 ip, struct thread *thread, struct machine *machine,
+	      char *buf, int len, bool *is64bit);
+
+#endif
diff --git a/tools/perf/util/intel-bts.c b/tools/perf/util/intel-bts.c
index 0c0180c67574..915f4662e52e 100644
--- a/tools/perf/util/intel-bts.c
+++ b/tools/perf/util/intel-bts.c
@@ -38,6 +38,7 @@
 #include "auxtrace.h"
 #include "intel-pt-decoder/intel-pt-insn-decoder.h"
 #include "intel-bts.h"
+#include "fetch.h"
 
 #define MAX_TIMESTAMP (~0ULL)
 
@@ -328,35 +329,19 @@ static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
 {
 	struct machine *machine = btsq->bts->machine;
 	struct thread *thread;
-	struct addr_location al;
 	unsigned char buf[INTEL_PT_INSN_BUF_SZ];
 	ssize_t len;
-	int x86_64;
-	uint8_t cpumode;
+	bool x86_64;
 	int err = -1;
 
-	if (machine__kernel_ip(machine, ip))
-		cpumode = PERF_RECORD_MISC_KERNEL;
-	else
-		cpumode = PERF_RECORD_MISC_USER;
-
 	thread = machine__find_thread(machine, -1, btsq->tid);
 	if (!thread)
 		return -1;
 
-	if (!thread__find_map(thread, cpumode, ip, &al) || !al.map->dso)
-		goto out_put;
-
-	len = dso__data_read_addr(al.map->dso, al.map, machine, ip, buf,
-				  INTEL_PT_INSN_BUF_SZ);
+	len = fetch_exe(ip, thread, machine, (char*)buf, INTEL_PT_INSN_BUF_SZ, &x86_64);
 	if (len <= 0)
 		goto out_put;
 
-	/* Load maps to ensure dso->is_64_bit has been updated */
-	map__load(al.map);
-
-	x86_64 = al.map->dso->is_64_bit;
-
 	if (intel_pt_get_insn(buf, len, x86_64, &btsq->intel_pt_insn))
 		goto out_put;
 
-- 
2.20.1