tools lib traceevent: Add support for "%.*s" in bprintk events
The arg notation of '*' in bprintks is not handled by the parser.
Implement it so that they show up properly in the output and do not
kill the tracer from reporting events.
Reported-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/n/tip-t0ctq7t1xz3ud6wv4v886jou@git.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 83f0a8a..0644c2a 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -3370,7 +3370,7 @@
break;
}
case PRINT_BSTRING:
- trace_seq_printf(s, format, arg->string.string);
+ print_str_to_seq(s, format, len_arg, arg->string.string);
break;
case PRINT_OP:
/*
@@ -3471,6 +3471,7 @@
unsigned long long ip, val;
char *ptr;
void *bptr;
+ int vsize;
field = pevent->bprint_buf_field;
ip_field = pevent->bprint_ip_field;
@@ -3519,6 +3520,8 @@
goto process_again;
case '0' ... '9':
goto process_again;
+ case '.':
+ goto process_again;
case 'p':
ls = 1;
/* fall through */
@@ -3526,23 +3529,29 @@
case 'u':
case 'x':
case 'i':
+ switch (ls) {
+ case 0:
+ vsize = 4;
+ break;
+ case 1:
+ vsize = pevent->long_size;
+ break;
+ case 2:
+ vsize = 8;
+ default:
+ vsize = ls; /* ? */
+ break;
+ }
+ /* fall through */
+ case '*':
+ if (*ptr == '*')
+ vsize = 4;
+
/* the pointers are always 4 bytes aligned */
bptr = (void *)(((unsigned long)bptr + 3) &
~3);
- switch (ls) {
- case 0:
- ls = 4;
- break;
- case 1:
- ls = pevent->long_size;
- break;
- case 2:
- ls = 8;
- default:
- break;
- }
- val = pevent_read_number(pevent, bptr, ls);
- bptr += ls;
+ val = pevent_read_number(pevent, bptr, vsize);
+ bptr += vsize;
arg = alloc_arg();
arg->next = NULL;
arg->type = PRINT_ATOM;
@@ -3550,6 +3559,13 @@
sprintf(arg->atom.atom, "%lld", val);
*next = arg;
next = &arg->next;
+ /*
+ * The '*' case means that an arg is used as the length.
+ * We need to continue to figure out for what.
+ */
+ if (*ptr == '*')
+ goto process_again;
+
break;
case 's':
arg = alloc_arg();