perf trace beauty: Allow accessing syscall args values in a syscall arg formatter

For instance, fcntl's upcoming 'arg' formatter needs to look at the
'cmd' value to decide how to format its value, sometimes it is a file
flags, sometimes an fd, a pointer to a structure, etc.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-2tw2jfaqm48dtw8a4addghze@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index b7f79de..40bc0a3 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1369,19 +1369,32 @@ out:
  * variable to read it. Most notably this avoids extended load instructions
  * on unaligned addresses
  */
+static unsigned long __syscall_arg__val(unsigned char *args, u8 idx)
+{
+       unsigned long val;
+       unsigned char *p = args + sizeof(unsigned long) * idx;
+
+       memcpy(&val, p, sizeof(val));
+       return val;
+}
+
+unsigned long syscall_arg__val(struct syscall_arg *arg, u8 idx)
+{
+       return __syscall_arg__val(arg->args, idx);
+}
 
 static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
                                      unsigned char *args, struct trace *trace,
                                      struct thread *thread)
 {
        size_t printed = 0;
-       unsigned char *p;
        unsigned long val;
 
        if (sc->args != NULL) {
                struct format_field *field;
                u8 bit = 1;
                struct syscall_arg arg = {
+                       .args   = args,
                        .idx    = 0,
                        .mask   = 0,
                        .trace  = trace,
@@ -1393,9 +1406,7 @@ static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
                        if (arg.mask & bit)
                                continue;
 
-                       /* special care for unaligned accesses */
-                       p = args + sizeof(unsigned long) * arg.idx;
-                       memcpy(&val, p, sizeof(val));
+                       val = syscall_arg__val(&arg, arg.idx);
 
                        /*
                         * Suppress this argument if its value is zero and
@@ -1431,9 +1442,7 @@ static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
                int i = 0;
 
                while (i < 6) {
-                       /* special care for unaligned accesses */
-                       p = args + sizeof(unsigned long) * i;
-                       memcpy(&val, p, sizeof(val));
+                       val = __syscall_arg__val(args, i);
                        printed += scnprintf(bf + printed, size - printed,
                                             "%sarg%d: %ld",
                                             printed ? ", " : "", i, val);

diff --git a/tools/perf/trace/beauty/beauty.h b/tools/perf/trace/beauty/beauty.h
index ce01079..6fbac0c 100644 (file)
--- a/tools/perf/trace/beauty/beauty.h
+++ b/tools/perf/trace/beauty/beauty.h
@@ -6,8 +6,19 @@
 struct trace;
 struct thread;
 
+/**
+ * @val: value of syscall argument being formatted
+ * @args: All the args, use syscall_args__val(arg, nth) to access one
+ * @thread: tid state (maps, pid, tid, etc)
+ * @trace: 'perf trace' internals: all threads, etc
+ * @parm: private area, may be an strarray, for instance
+ * @idx: syscall arg idx (is this the first?)
+ * @mask: a syscall arg may mask another arg, see syscall_arg__scnprintf_futex_op
+ */
+
 struct syscall_arg {
        unsigned long val;
+       unsigned char *args;
        struct thread *thread;
        struct trace  *trace;
        void          *parm;
@@ -15,6 +26,8 @@ struct syscall_arg {
        u8            mask;
 };
 
+unsigned long syscall_arg__val(struct syscall_arg *arg, u8 idx);
+
 size_t syscall_arg__scnprintf_strarrays(char *bf, size_t size, struct syscall_arg *arg);
 #define SCA_STRARRAYS syscall_arg__scnprintf_strarrays