From patchwork Mon Nov 22 09:36:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 12631533 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 178F7C433F5 for ; Mon, 22 Nov 2021 09:37:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238925AbhKVJkH (ORCPT ); Mon, 22 Nov 2021 04:40:07 -0500 Received: from mail.kernel.org ([198.145.29.99]:38532 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238829AbhKVJkG (ORCPT ); Mon, 22 Nov 2021 04:40:06 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 262BA604DA; Mon, 22 Nov 2021 09:36:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1637573820; bh=ep7kjDpim82IE1kNg00+O1bFbEi691vy1bCO8AKqDmU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nMyzMcq1P85HpZ4mmpE8Xs4a5IPPlIiEnPx2AmdnJu+ekRzUEGZbuFuIyULfn2k01 Jg//HgP46lRbNun6juWk98I5CDNWocHzw+M5elMY3j9ERfHs43ptKGzJzZpDO1w8l3 D63rMmJRnKEpBpRRuizKnG/gH8p+X7GdWojUZhMxW9Ns8T7ubViiFUdfZwi97CwmLv c2TdnmkrtrHDmhUAmUHmlTl4p+axCS7kMHEnZVpCRvktg3xCJepHOIBhMnAG+uFvAA S4DVCWvHNKk4dU9hvxeUIeoEhSujC6f+lFMojjyMnS2xoncciYi3D/nTVD3bukGbL1 n7YrXswlSAArw== From: Masami Hiramatsu To: Steven Rostedt Cc: Beau Belgrave , Masami Hiramatsu , linux-trace-devel@vger.kernel.org, Tzvetomir Stoyanov Subject: [PATCH] libtraceevent: Add __rel_loc relative location attribute support Date: Mon, 22 Nov 2021 18:36:57 +0900 Message-Id: <163757381684.511392.14804088833440960833.stgit@devnote2> X-Mailer: git-send-email 2.25.1 In-Reply-To: <163757380763.511392.6830680420693577369.stgit@devnote2> References: <163757380763.511392.6830680420693577369.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org Add '__rel_loc' new dynamic data location attribute which encodes the data location from the next to the field itself. This is similar to the '__data_loc' but the location offset is not from the event entry but from the next of the field. This patch adds '__rel_loc' decoding support in the libtraceevent. Signed-off-by: Masami Hiramatsu --- src/event-parse.c | 54 +++++++++++++++++++++++++++++++++------------------- src/event-parse.h | 5 +++-- src/parse-filter.c | 5 ++++- 3 files changed, 41 insertions(+), 23 deletions(-) diff --git a/src/event-parse.c b/src/event-parse.c index 70637586bc9a..2781cac26eeb 100644 --- a/src/event-parse.c +++ b/src/event-parse.c @@ -1529,6 +1529,14 @@ static int field_is_dynamic(struct tep_format_field *field) return 0; } +static int field_is_relative_dynamic(struct tep_format_field *field) +{ + if (strncmp(field->type, "__rel_loc", 9) == 0) + return 1; + + return 0; +} + static int field_is_long(struct tep_format_field *field) { /* includes long long */ @@ -1784,6 +1792,8 @@ static int event_read_fields(struct tep_event *event, struct tep_format_field ** field->flags |= TEP_FIELD_IS_STRING; if (field_is_dynamic(field)) field->flags |= TEP_FIELD_IS_DYNAMIC; + if (field_is_relative_dynamic(field)) + field->flags |= TEP_FIELD_IS_DYNAMIC | TEP_FIELD_IS_RELATIVE; if (field_is_long(field)) field->flags |= TEP_FIELD_IS_LONG; @@ -3113,7 +3123,7 @@ process_str(struct tep_event *event __maybe_unused, struct tep_print_arg *arg, arg->type = TEP_PRINT_STRING; arg->string.string = token; - arg->string.offset = -1; + arg->string.field = NULL; if (read_expected(TEP_EVENT_DELIM, ")") < 0) goto out_err; @@ -3142,7 +3152,7 @@ process_bitmask(struct tep_event *event __maybe_unused, struct tep_print_arg *ar arg->type = TEP_PRINT_BITMASK; arg->bitmask.bitmask = token; - arg->bitmask.offset = -1; + arg->bitmask.field = NULL; if (read_expected(TEP_EVENT_DELIM, ")") < 0) goto out_err; @@ -3308,19 +3318,23 @@ process_function(struct tep_event *event, struct tep_print_arg *arg, free_token(token); return process_int_array(event, arg, tok); } - if (strcmp(token, "__get_str") == 0) { + if (strcmp(token, "__get_str") == 0 || + strcmp(token, "__get_rel_str") == 0) { free_token(token); return process_str(event, arg, tok); } - if (strcmp(token, "__get_bitmask") == 0) { + if (strcmp(token, "__get_bitmask") == 0 || + strcmp(token, "__get_rel_bitmask") == 0) { free_token(token); return process_bitmask(event, arg, tok); } - if (strcmp(token, "__get_dynamic_array") == 0) { + if (strcmp(token, "__get_dynamic_array") == 0 || + strcmp(token, "__get_rel_dynamic_array") == 0) { free_token(token); return process_dynamic_array(event, arg, tok); } - if (strcmp(token, "__get_dynamic_array_len") == 0) { + if (strcmp(token, "__get_dynamic_array_len") == 0 || + strcmp(token, "__get_rel_dynamic_array_len") == 0) { free_token(token); return process_dynamic_array_len(event, arg, tok); } @@ -3886,6 +3900,8 @@ static inline void dynamic_offset_field(struct tep_handle *tep, unsigned int *len) { dynamic_offset(tep, field->size, data + field->offset, offset, len); + if (field->flags & TEP_FIELD_IS_RELATIVE) + offset += field->offset + field->size; } static unsigned long long @@ -4398,13 +4414,11 @@ static void print_str_arg(struct trace_seq *s, void *data, int size, case TEP_PRINT_TYPE: break; case TEP_PRINT_STRING: { - if (arg->string.offset == -1) { - struct tep_format_field *f; - - f = tep_find_any_field(event, arg->string.string); - arg->string.offset = f->offset; - } - dynamic_offset(tep, 4, data + arg->string.offset, &offset, &len); + if (!arg->string.field) + arg->string.field = tep_find_any_field(event, arg->string.string); + if (!arg->string.field) + break; + dynamic_offset_field(tep, arg->string.field, data, &offset, &len); /* Do not attempt to save zero length dynamic strings */ if (!len) break; @@ -4415,13 +4429,11 @@ static void print_str_arg(struct trace_seq *s, void *data, int size, print_str_to_seq(s, format, len_arg, arg->string.string); break; case TEP_PRINT_BITMASK: { - if (arg->bitmask.offset == -1) { - struct tep_format_field *f; - - f = tep_find_any_field(event, arg->bitmask.bitmask); - arg->bitmask.offset = f->offset; - } - dynamic_offset(tep, 4, data + arg->bitmask.offset, &offset, &len); + if (!arg->bitmask.field) + arg->bitmask.field = tep_find_any_field(event, arg->bitmask.bitmask); + if (!arg->bitmask.field) + break; + dynamic_offset_field(tep, arg->bitmask.field, data, &offset, &len); print_bitmask_to_seq(tep, s, format, len_arg, data + offset, len); break; @@ -7343,6 +7355,8 @@ void *tep_get_field_raw(struct trace_seq *s, struct tep_event *event, data + offset, field->size); *len = offset >> 16; offset &= 0xffff; + if (field->flags & TEP_FIELD_IS_RELATIVE) + offset += field->offset + field->size; } else *len = field->size; diff --git a/src/event-parse.h b/src/event-parse.h index 083389358127..db8bc6db5431 100644 --- a/src/event-parse.h +++ b/src/event-parse.h @@ -125,6 +125,7 @@ enum tep_format_flags { TEP_FIELD_IS_LONG = 32, TEP_FIELD_IS_FLAG = 64, TEP_FIELD_IS_SYMBOLIC = 128, + TEP_FIELD_IS_RELATIVE = 256, }; struct tep_format_field { @@ -153,12 +154,12 @@ struct tep_print_arg_atom { struct tep_print_arg_string { char *string; - int offset; + struct tep_format_field *field; }; struct tep_print_arg_bitmask { char *bitmask; - int offset; + struct tep_format_field *field; }; struct tep_print_arg_field { diff --git a/src/parse-filter.c b/src/parse-filter.c index 368826bb5a57..5df177070d53 100644 --- a/src/parse-filter.c +++ b/src/parse-filter.c @@ -1712,8 +1712,11 @@ static const char *get_field_str(struct tep_filter_arg *arg, struct tep_record * if (arg->str.field->flags & TEP_FIELD_IS_DYNAMIC) { addr = *(unsigned int *)val; - val = record->data + (addr & 0xffff); size = addr >> 16; + addr &= 0xffff; + if (arg->str.field->flags & TEP_FIELD_IS_RELATIVE) + addr += arg->str.field->offset + arg->str.field->size; + val = record->data + addr; } /*