From 52ffe0ff02fc053a025c381d5808e9ecd3206dfe Mon Sep 17 00:00:00 2001
From: He Kuang <hekuang@huawei.com>
Date: Fri, 3 Jun 2016 03:33:22 +0000
Subject: perf callchain: Support x86 target platform

Support x86(32-bit) cross platform callchain unwind.

Signed-off-by: He Kuang <hekuang@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ekaterina Tumanova <tumanova@linux.vnet.ibm.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1464924803-22214-14-git-send-email-hekuang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/unwind-libunwind.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

(limited to 'tools/perf/util/unwind-libunwind.c')

diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
index 0086726e00e0..e65515aa61d9 100644
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -5,6 +5,7 @@
 #include "arch/common.h"
 
 struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
+struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
 
 static void unwind__register_ops(struct thread *thread,
 			  struct unwind_libunwind_ops *ops)
@@ -16,6 +17,7 @@ int unwind__prepare_access(struct thread *thread, struct map *map)
 {
 	const char *arch;
 	enum dso_type dso_type;
+	struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops;
 
 	if (thread->addr_space) {
 		pr_debug("unwind: thread map already set, dso=%s\n",
@@ -32,9 +34,18 @@ int unwind__prepare_access(struct thread *thread, struct map *map)
 		return 0;
 
 	arch = normalize_arch(thread->mg->machine->env->arch);
-	pr_debug("unwind: target platform=%s\n", arch);
+
+	if (!strcmp(arch, "x86")) {
+		if (dso_type != DSO__TYPE_64BIT)
+			ops = x86_32_unwind_libunwind_ops;
+	}
+
+	if (!ops) {
+		pr_err("unwind: target platform=%s is not supported\n", arch);
+		return -1;
+	}
 out_register:
-	unwind__register_ops(thread, local_unwind_libunwind_ops);
+	unwind__register_ops(thread, ops);
 
 	return thread->unwind_libunwind_ops->prepare_access(thread);
 }
-- 
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