perf tools: Add automatic remapping of Android libraries

This patch automatically adjusts the path of MMAP records
associated with Android system libraries.

The Android system is organized with system libraries found in
/system/lib and user libraries in /data/app-lib. On the host system
(not running Android), system libraries can be found in the downloaded
NDK directory under ${NDK_ROOT}/platforms/${APP_PLATFORM}/arch-${ARCH}/usr/lib
and the user libraries are installed under libs/${APP_ABI} within
the apk build directory. This patch makes running the reporting
tools possible on the host system using the libraries from the NDK.

Signed-off-by: Michael Lentine <mlentine@google.com>
Reviewed-by: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1400579330-5043-3-git-send-email-eranian@google.com
[ fixed 'space required before the open parenthesis' checkpatch.pl errors ]
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

1 files changed, 94 insertions, 1 deletions

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index ba5f5c0c838b..8ccbb32eda25 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -32,6 +32,93 @@ static inline int is_no_dso_memory(const char *filename)
                !strcmp(filename, "[heap]");
 }
 
+static inline int is_android_lib(const char *filename)
+{
+        return !strncmp(filename, "/data/app-lib", 13) ||
+               !strncmp(filename, "/system/lib", 11);
+}
+
+static inline bool replace_android_lib(const char *filename, char *newfilename)
+{
+        const char *libname;
+        char *app_abi;
+        size_t app_abi_length, new_length;
+        size_t lib_length = 0;
+
+        libname  = strrchr(filename, '/');
+        if (libname)
+                lib_length = strlen(libname);
+
+        app_abi = getenv("APP_ABI");
+        if (!app_abi)
+                return false;
+
+        app_abi_length = strlen(app_abi);
+
+        if (!strncmp(filename, "/data/app-lib", 13)) {
+                char *apk_path;
+
+                if (!app_abi_length)
+                        return false;
+
+                new_length = 7 + app_abi_length + lib_length;
+
+                apk_path = getenv("APK_PATH");
+                if (apk_path) {
+                        new_length += strlen(apk_path) + 1;
+                        if (new_length > PATH_MAX)
+                                return false;
+                        snprintf(newfilename, new_length,
+                                 "%s/libs/%s/%s", apk_path, app_abi, libname);
+                } else {
+                        if (new_length > PATH_MAX)
+                                return false;
+                        snprintf(newfilename, new_length,
+                                 "libs/%s/%s", app_abi, libname);
+                }
+                return true;
+        }
+
+        if (!strncmp(filename, "/system/lib/", 11)) {
+                char *ndk, *app;
+                const char *arch;
+                size_t ndk_length;
+                size_t app_length;
+
+                ndk = getenv("NDK_ROOT");
+                app = getenv("APP_PLATFORM");
+
+                if (!(ndk && app))
+                        return false;
+
+                ndk_length = strlen(ndk);
+                app_length = strlen(app);
+
+                if (!(ndk_length && app_length && app_abi_length))
+                        return false;
+
+                arch = !strncmp(app_abi, "arm", 3) ? "arm" :
+                       !strncmp(app_abi, "mips", 4) ? "mips" :
+                       !strncmp(app_abi, "x86", 3) ? "x86" : NULL;
+
+                if (!arch)
+                        return false;
+
+                new_length = 27 + ndk_length +
+                             app_length + lib_length
+                           + strlen(arch);
+
+                if (new_length > PATH_MAX)
+                        return false;
+                snprintf(newfilename, new_length,
+                        "%s/platforms/%s/arch-%s/usr/lib/%s",
+                        ndk, app, arch, libname);
+
+                return true;
+        }
+        return false;
+}
+
 void map__init(struct map *map, enum map_type type,
                u64 start, u64 end, u64 pgoff, struct dso *dso)
 {
@@ -59,8 +146,9 @@ struct map *map__new(struct list_head *dsos__list, u64 start, u64 len,
         if (map != NULL) {
                 char newfilename[PATH_MAX];
                 struct dso *dso;
-                int anon, no_dso, vdso;
+                int anon, no_dso, vdso, android;
 
+                android = is_android_lib(filename);
                 anon = is_anon_memory(filename);
                 vdso = is_vdso_map(filename);
                 no_dso = is_no_dso_memory(filename);
@@ -75,6 +163,11 @@ struct map *map__new(struct list_head *dsos__list, u64 start, u64 len,
                         filename = newfilename;
                 }
 
+                if (android) {
+                        if (replace_android_lib(filename, newfilename))
+                                filename = newfilename;
+                }
+
                 if (vdso) {
                         pgoff = 0;
                         dso = vdso__dso_findnew(dsos__list);