[PATCH 09/12] perf tools: save syscall map

[Tom Zanussi <tzanussi@gmail.com>]

Read the exported syscall metadata and save it in the trace file for
post-processing tools.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
---
 tools/perf/util/trace-event-info.c  |   25 ++++++++++++++
 tools/perf/util/trace-event-parse.c |   63 +++++++++++++++++++++++++++++++++++
 tools/perf/util/trace-event-read.c  |   18 ++++++++++
 tools/perf/util/trace-event.h       |   10 +++++
 4 files changed, 116 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index 5ea8973..6a6e5cc 100644
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -461,6 +461,30 @@ out:
 	put_tracing_file(path);
 }
 
+static void read_syscall_map(void)
+{
+	unsigned int size, check_size;
+	char *path;
+	struct stat st;
+	int ret;
+
+	path = get_tracing_file("syscall_map");
+	ret = stat(path, &st);
+	if (ret < 0) {
+		/* not found */
+		size = 0;
+		write_or_die(&size, 4);
+		goto out;
+	}
+	size = get_size(path);
+	write_or_die(&size, 4);
+	check_size = copy_file(path);
+	if (size != check_size)
+		die("error in size of file '%s'", path);
+out:
+	put_tracing_file(path);
+}
+
 static struct tracepoint_path *
 get_tracepoints_path(struct perf_event_attr *pattrs, int nb_events)
 {
@@ -523,6 +547,7 @@ int read_tracing_data(int fd, struct perf_event_attr *pattrs, int nb_events)
 	read_event_files(tps);
 	read_proc_kallsyms();
 	read_ftrace_printk();
+	read_syscall_map();
 
 	return 0;
 }
diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index c1299ff..31bb6f2 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -336,6 +336,69 @@ void print_printk(void)
 	}
 }
 
+static struct syscall_metadata *syscalls;
+static int syscall_count;
+
+void parse_syscall_map(char *file, int size __unused)
+{
+	struct syscall_list {
+		struct syscall_list	*next;
+		char			*name;
+		int			nr;
+	} *list = NULL, *item;
+	char *line;
+	char *next = NULL;
+	int i;
+
+	line = strtok_r(file, "\n", &next);
+	while (line) {
+		item = malloc_or_die(sizeof(*item));
+		sscanf(line, "%d:%as", &item->nr,
+		       (float *)(void *)&item->name); /* workaround gcc warning */
+		item->next = list;
+		list = item;
+		line = strtok_r(NULL, "\n", &next);
+		syscall_count++;
+	}
+
+	syscalls = malloc_or_die(sizeof(*syscalls) * syscall_count);
+
+	i = 0;
+	while (list) {
+		syscalls[i].nr = list->nr;
+		syscalls[i].name = list->name;
+		i++;
+		item = list;
+		list = list->next;
+		free(item);
+	}
+}
+
+int nr_syscalls(void)
+{
+	return syscall_count;
+}
+
+const struct syscall_metadata *syscall_at_idx(int idx)
+{
+	if (idx >= syscall_count)
+		return NULL;
+
+	return &syscalls[idx];
+}
+
+const struct syscall_metadata *find_syscall(int syscall_nr)
+{
+	int i;
+
+	for (i = 0; i < syscall_count; i++) {
+		if (syscalls[i].nr == syscall_nr)
+			return &syscalls[i];
+	}
+
+	return NULL;
+}
+
 static struct event *alloc_event(void)
 {
 	struct event *event;
diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c
index 1744422..70fcaec 100644
--- a/tools/perf/util/trace-event-read.c
+++ b/tools/perf/util/trace-event-read.c
@@ -171,6 +171,23 @@ static void read_ftrace_printk(void)
 	free(buf);
 }
 
+static void read_syscall_map(void)
+{
+	unsigned int size;
+	char *buf;
+
+	size = read4();
+	if (!size)
+		return;
+
+	buf = malloc_or_die(size);
+	read_or_die(buf, size);
+
+	parse_syscall_map(buf, size);
+
+	free(buf);
+}
+
 static void read_header_files(void)
 {
 	unsigned long long size;
@@ -498,6 +515,7 @@ void trace_report(int fd)
 	read_event_files();
 	read_proc_kallsyms();
 	read_ftrace_printk();
+	read_syscall_map();
 
 	if (show_funcs) {
 		print_funcs();
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index c3269b9..5313ad8 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -178,6 +178,16 @@ int parse_event_file(char *buf, unsigned long size, char *sys);
 void print_event(int cpu, void *data, int size, unsigned long long nsecs,
 		  char *comm);
 
+struct syscall_metadata {
+	char *name;
+	int nr;
+};
+
+void parse_syscall_map(char *file, int size);
+int nr_syscalls(void);
+const struct syscall_metadata *syscall_at_idx(int idx);
+const struct syscall_metadata *find_syscall(int syscall_nr);
+
 extern int file_bigendian;
 extern int host_bigendian;
 
-- 
1.6.4.GIT