From b30f75eba27a9ab0704cbc501e9be3b025ce56fe Mon Sep 17 00:00:00 2001 From: Howard Cochran Date: Fri, 1 Nov 2013 17:53:56 -0400 Subject: [PATCH] tools lib traceevent: Handle __print_hex(__get_dynamic_array(fieldname), len) The kernel has a few events with a format similar to this excerpt: field:unsigned int len; offset:12; size:4; signed:0; field:__data_loc unsigned char[] data_array; offset:16; size:4; signed:0; print fmt: "%s", __print_hex(__get_dynamic_array(data_array), REC->len) trace-cmd could already parse that arg correctly, but print_str_arg() was unable to handle the first parameter being a dynamic array. (It just printed a "field not found" warning). Teach print_str_arg's PRINT_HEX case to handle the nested PRINT_DYNAMIC_ARRAY correctly. The output now matches the kernel's own formatting for this case. Signed-off-by: Howard Cochran Cc: Andrew Morton Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Namhyung Kim Link: http://lkml.kernel.org/r/1381503349-12271-1-git-send-email-hcochran@lexmark.com [ Removed "polish compare", we don't do that here ] Signed-off-by: Steven Rostedt Signed-off-by: Arnaldo Carvalho de Melo --- tools/lib/traceevent/event-parse.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index 013c8d3db806..0a1ffe07de3f 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -3588,15 +3588,23 @@ static void print_str_arg(struct trace_seq *s, void *data, int size, } break; case PRINT_HEX: - field = arg->hex.field->field.field; - if (!field) { - str = arg->hex.field->field.name; - field = pevent_find_any_field(event, str); - if (!field) - goto out_warning_field; - arg->hex.field->field.field = field; + if (arg->hex.field->type == PRINT_DYNAMIC_ARRAY) { + unsigned long offset; + offset = pevent_read_number(pevent, + data + arg->hex.field->dynarray.field->offset, + arg->hex.field->dynarray.field->size); + hex = data + (offset & 0xffff); + } else { + field = arg->hex.field->field.field; + if (!field) { + str = arg->hex.field->field.name; + field = pevent_find_any_field(event, str); + if (!field) + goto out_warning_field; + arg->hex.field->field.field = field; + } + hex = data + field->offset; } - hex = data + field->offset; len = eval_num_arg(data, size, event, arg->hex.size); for (i = 0; i < len; i++) { if (i) -- 2.20.1