linux-kernel - [PATCH v6 11/11] perf callchain: Support aarch64 cross-platform

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Date:	Sat, 28 May 2016 12:00:00 +0000
From:	He Kuang <hekuang@...wei.com>
To:	<peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
	<alexander.shishkin@...ux.intel.com>, <jolsa@...hat.com>,
	<wangnan0@...wei.com>, <hekuang@...wei.com>, <jpoimboe@...hat.com>,
	<ak@...ux.intel.com>, <eranian@...gle.com>, <namhyung@...nel.org>,
	<adrian.hunter@...el.com>, <sukadev@...ux.vnet.ibm.com>,
	<masami.hiramatsu.pt@...achi.com>, <tumanova@...ux.vnet.ibm.com>,
	<kan.liang@...el.com>, <penberg@...nel.org>, <dsahern@...il.com>
CC:	<linux-kernel@...r.kernel.org>
Subject: [PATCH v6 11/11] perf callchain: Support aarch64 cross-platform

Support aarch64 cross platform callchain unwind.

Signed-off-by: He Kuang <hekuang@...wei.com>
---
 tools/perf/arch/Build                              |  1 +
 tools/perf/arch/arm64/util/unwind-libunwind.c      |  4 +++-
 .../perf/arch/arm64/util/unwind-libunwind_arm64.c  | 22 ++++++++++++++++++++++
 tools/perf/config/Makefile                         | 12 ++++++++++++
 tools/perf/util/unwind-libunwind.c                 |  6 +++++-
 tools/perf/util/unwind.h                           | 10 ++++++++++
 6 files changed, 53 insertions(+), 2 deletions(-)
 create mode 100644 tools/perf/arch/arm64/util/unwind-libunwind_arm64.c

diff --git a/tools/perf/arch/Build b/tools/perf/arch/Build
index 3fc4af1..bc49295 100644
--- a/tools/perf/arch/Build
+++ b/tools/perf/arch/Build
@@ -1,3 +1,4 @@
 libperf-y += common.o
 libperf-y += $(ARCH)/
 libperf-$(CONFIG_LIBUNWIND_X86)      += x86/util/unwind-libunwind_x86_32.o
+libperf-$(CONFIG_LIBUNWIND_AARCH64)  += arm64/util/unwind-libunwind_arm64.o
diff --git a/tools/perf/arch/arm64/util/unwind-libunwind.c b/tools/perf/arch/arm64/util/unwind-libunwind.c
index a87afa9..c116b71 100644
--- a/tools/perf/arch/arm64/util/unwind-libunwind.c
+++ b/tools/perf/arch/arm64/util/unwind-libunwind.c
@@ -1,11 +1,13 @@
 
+#ifndef REMOTE_UNWIND_LIBUNWIND
 #include <errno.h>
 #include <libunwind.h>
 #include "perf_regs.h"
 #include "../../util/unwind.h"
 #include "../../util/debug.h"
+#endif
 
-int libunwind__arch_reg_id(int regnum)
+int LIBUNWIND__ARCH_REG_ID(int regnum)
 {
 	switch (regnum) {
 	case UNW_AARCH64_X0:
diff --git a/tools/perf/arch/arm64/util/unwind-libunwind_arm64.c b/tools/perf/arch/arm64/util/unwind-libunwind_arm64.c
new file mode 100644
index 0000000..ea9e7d1
--- /dev/null
+++ b/tools/perf/arch/arm64/util/unwind-libunwind_arm64.c
@@ -0,0 +1,22 @@
+#define REMOTE_UNWIND_LIBUNWIND
+
+#define LIBUNWIND__ARCH_REG_ID libunwind__arm64_reg_id
+
+#include "unwind.h"
+#include "debug.h"
+#include "libunwind-aarch64.h"
+#include <../../../../../arch/arm64/include/uapi/asm/perf_regs.h>
+#include "unwind-libunwind.c"
+
+#undef NO_LIBUNWIND_DEBUG_FRAME
+#ifdef NO_LIBUNWIND_DEBUG_FRAME_AARCH64
+#define NO_LIBUNWIND_DEBUG_FRAME
+#endif
+
+#include "util/unwind-libunwind-local.c"
+
+int register_arm64_unwind_libunwind_ops(struct thread *thread)
+{
+	thread->unwind_libunwind_ops = &_unwind_libunwind_ops;
+	return 0;
+}
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index e156f76..bb5aea8 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -363,6 +363,18 @@ ifndef NO_LIBUNWIND
     have_libunwind = 1
   endif
 
+  ifeq ($(feature-libunwind-aarch64), 1)
+    $(call detected,CONFIG_LIBUNWIND_AARCH64)
+    CFLAGS += -DHAVE_LIBUNWIND_AARCH64_SUPPORT
+    LDFLAGS += -lunwind-aarch64
+    have_libunwind = 1
+    $(call feature_check,libunwind-debug-frame-aarch64)
+    ifneq ($(feature-libunwind-debug-frame-aarch64), 1)
+      msg := $(warning No debug_frame support found in libunwind-aarch64);
+      CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME_AARCH64
+    endif
+  endif
+
   ifneq ($(feature-libunwind), 1)
     msg := $(warning No libunwind found. Please install libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR);
     NO_LOCAL_LIBUNWIND := 1
diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
index c1d9d36..5930865 100644
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -25,9 +25,13 @@ int unwind__prepare_access(struct thread *thread, struct map *map)
 
 	arch = normalize_arch(thread->mg->machine->env->arch);
 
-	if (!strcmp(arch, "x86"))
+	if (!strcmp(arch, "x86")) {
 		if (dso_type != DSO__TYPE_64BIT)
 			register_func = register_x86_32_unwind_libunwind_ops;
+	} else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) {
+		if (dso_type == DSO__TYPE_64BIT)
+			register_func = register_arm64_unwind_libunwind_ops;
+	}
 
 	if (register_func) {
 		ret = register_func(thread);
diff --git a/tools/perf/util/unwind.h b/tools/perf/util/unwind.h
index 43f9f66..e203aa9 100644
--- a/tools/perf/util/unwind.h
+++ b/tools/perf/util/unwind.h
@@ -56,6 +56,16 @@ register_x86_32_unwind_libunwind_ops(struct thread *thread __maybe_unused)
 }
 #endif
 
+#ifdef HAVE_LIBUNWIND_AARCH64_SUPPORT
+int register_arm64_unwind_libunwind_ops(struct thread *thread);
+#else
+static inline int
+register_arm64_unwind_libunwind_ops(struct thread *thread __maybe_unused)
+{
+	return -1;
+}
+#endif
+
 #else
 static inline int
 unwind__get_entries(unwind_entry_cb_t cb __maybe_unused,
-- 
1.8.5.2