perf tools: Try to find cross-built objdump path

As we have architecture information of saved perf.data file, we can try
to find cross-built objdump path.

The triplets include support for Android (arm, x86 and mips
architectures).

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Originally-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1350344020-8071-5-git-send-email-irina.tirdea@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 188 insertions, 0 deletions

diff --git a/tools/perf/arch/common.c b/tools/perf/arch/common.c
new file mode 100644
index 000000000000..2367b253f039
--- /dev/null
+++ b/tools/perf/arch/common.c
@@ -0,0 +1,178 @@
+#include <stdio.h>
+#include <sys/utsname.h>
+#include "common.h"
+#include "../util/debug.h"
+
+const char *const arm_triplets[] = {
+        "arm-eabi-",
+        "arm-linux-androideabi-",
+        "arm-unknown-linux-",
+        "arm-unknown-linux-gnu-",
+        "arm-unknown-linux-gnueabi-",
+        NULL
+};
+
+const char *const powerpc_triplets[] = {
+        "powerpc-unknown-linux-gnu-",
+        "powerpc64-unknown-linux-gnu-",
+        NULL
+};
+
+const char *const s390_triplets[] = {
+        "s390-ibm-linux-",
+        NULL
+};
+
+const char *const sh_triplets[] = {
+        "sh-unknown-linux-gnu-",
+        "sh64-unknown-linux-gnu-",
+        NULL
+};
+
+const char *const sparc_triplets[] = {
+        "sparc-unknown-linux-gnu-",
+        "sparc64-unknown-linux-gnu-",
+        NULL
+};
+
+const char *const x86_triplets[] = {
+        "x86_64-pc-linux-gnu-",
+        "x86_64-unknown-linux-gnu-",
+        "i686-pc-linux-gnu-",
+        "i586-pc-linux-gnu-",
+        "i486-pc-linux-gnu-",
+        "i386-pc-linux-gnu-",
+        "i686-linux-android-",
+        "i686-android-linux-",
+        NULL
+};
+
+const char *const mips_triplets[] = {
+        "mips-unknown-linux-gnu-",
+        "mipsel-linux-android-",
+        NULL
+};
+
+static bool lookup_path(char *name)
+{
+        bool found = false;
+        char *path, *tmp;
+        char buf[PATH_MAX];
+        char *env = getenv("PATH");
+
+        if (!env)
+                return false;
+
+        env = strdup(env);
+        if (!env)
+                return false;
+
+        path = strtok_r(env, ":", &tmp);
+        while (path) {
+                scnprintf(buf, sizeof(buf), "%s/%s", path, name);
+                if (access(buf, F_OK) == 0) {
+                        found = true;
+                        break;
+                }
+                path = strtok_r(NULL, ":", &tmp);
+        }
+        free(env);
+        return found;
+}
+
+static int lookup_triplets(const char *const *triplets, const char *name)
+{
+        int i;
+        char buf[PATH_MAX];
+
+        for (i = 0; triplets[i] != NULL; i++) {
+                scnprintf(buf, sizeof(buf), "%s%s", triplets[i], name);
+                if (lookup_path(buf))
+                        return i;
+        }
+        return -1;
+}
+
+static int perf_session_env__lookup_binutils_path(struct perf_session_env *env,
+                                                  const char *name,
+                                                  const char **path)
+{
+        int idx;
+        char *arch, *cross_env;
+        struct utsname uts;
+        const char *const *path_list;
+        char *buf = NULL;
+
+        if (uname(&uts) < 0)
+                goto out;
+
+        /*
+         * We don't need to try to find objdump path for native system.
+         * Just use default binutils path (e.g.: "objdump").
+         */
+        if (!strcmp(uts.machine, env->arch))
+                goto out;
+
+        cross_env = getenv("CROSS_COMPILE");
+        if (cross_env) {
+                if (asprintf(&buf, "%s%s", cross_env, name) < 0)
+                        goto out_error;
+                if (buf[0] == '/') {
+                        if (access(buf, F_OK) == 0)
+                                goto out;
+                        goto out_error;
+                }
+                if (lookup_path(buf))
+                        goto out;
+                free(buf);
+        }
+
+        arch = env->arch;
+
+        if (!strcmp(arch, "arm"))
+                path_list = arm_triplets;
+        else if (!strcmp(arch, "powerpc"))
+                path_list = powerpc_triplets;
+        else if (!strcmp(arch, "sh"))
+                path_list = sh_triplets;
+        else if (!strcmp(arch, "s390"))
+                path_list = s390_triplets;
+        else if (!strcmp(arch, "sparc"))
+                path_list = sparc_triplets;
+        else if (!strcmp(arch, "x86") || !strcmp(arch, "i386") ||
+                 !strcmp(arch, "i486") || !strcmp(arch, "i586") ||
+                 !strcmp(arch, "i686"))
+                path_list = x86_triplets;
+        else if (!strcmp(arch, "mips"))
+                path_list = mips_triplets;
+        else {
+                ui__error("binutils for %s not supported.\n", arch);
+                goto out_error;
+        }
+
+        idx = lookup_triplets(path_list, name);
+        if (idx < 0) {
+                ui__error("Please install %s for %s.\n"
+                          "You can add it to PATH, set CROSS_COMPILE or "
+                          "override the default using --%s.\n",
+                          name, arch, name);
+                goto out_error;
+        }
+
+        if (asprintf(&buf, "%s%s", path_list[idx], name) < 0)
+                goto out_error;
+
+out:
+        *path = buf;
+        return 0;
+out_error:
+        free(buf);
+        *path = NULL;
+        return -1;
+}
+
+int perf_session_env__lookup_objdump(struct perf_session_env *env)
+{
+        return perf_session_env__lookup_binutils_path(env, "objdump",
+                                                      &objdump_path);
+}
diff --git a/tools/perf/arch/common.h b/tools/perf/arch/common.h
new file mode 100644
index 000000000000..ede246eda9be
--- /dev/null
+++ b/tools/perf/arch/common.h
@@ -0,0 +1,10 @@
+#ifndef ARCH_PERF_COMMON_H
+#define ARCH_PERF_COMMON_H
+
+#include "../util/session.h"
+
+extern const char *objdump_path;
+
+int perf_session_env__lookup_objdump(struct perf_session_env *env);
+
+#endif /* ARCH_PERF_COMMON_H */