From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 30019 invoked by alias); 29 Nov 2013 14:39:13 -0000 Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org Received: (qmail 30004 invoked by uid 89); 29 Nov 2013 14:39:13 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.1 required=5.0 tests=AWL,BAYES_40,RDNS_NONE,URIBL_BLOCKED autolearn=no version=3.3.2 X-HELO: mga02.intel.com Received: from Unknown (HELO mga02.intel.com) (134.134.136.20) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Fri, 29 Nov 2013 14:39:12 +0000 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga101.jf.intel.com with ESMTP; 29 Nov 2013 06:38:23 -0800 X-ExtLoop1: 1 Received: from irvmail001.ir.intel.com ([163.33.26.43]) by fmsmga001.fm.intel.com with ESMTP; 29 Nov 2013 06:38:22 -0800 Received: from ulvlx001.iul.intel.com (ulvlx001.iul.intel.com [172.28.207.17]) by irvmail001.ir.intel.com (8.14.3/8.13.6/MailSET/Hub) with ESMTP id rATEcLxZ012369; Fri, 29 Nov 2013 14:38:21 GMT Received: from ulvlx001.iul.intel.com (localhost [127.0.0.1]) by ulvlx001.iul.intel.com with ESMTP id rATEcLrk012849; Fri, 29 Nov 2013 15:38:21 +0100 Received: (from mmetzger@localhost) by ulvlx001.iul.intel.com with œ id rATEcLC9012845; Fri, 29 Nov 2013 15:38:21 +0100 From: Markus Metzger To: jan.kratochvil@redhat.com Cc: gdb-patches@sourceware.org Subject: [patch v7 16/24] record-btrace, frame: supply target-specific unwinder Date: Fri, 29 Nov 2013 14:39:00 -0000 Message-Id: <1385735899-12481-17-git-send-email-markus.t.metzger@intel.com> In-Reply-To: <1385735899-12481-1-git-send-email-markus.t.metzger@intel.com> References: <1385735899-12481-1-git-send-email-markus.t.metzger@intel.com> X-IsSubscribed: yes X-SW-Source: 2013-11/txt/msg00921.txt.bz2 Supply a target-specific frame unwinder for the record-btrace target that does not allow unwinding while replaying. 2013-02-11 Jan Kratochvil Markus Metzger gdb/ * record-btrace.c: Include frame-unwind.h. (record_btrace_frame_unwind_stop_reason, record_btrace_frame_this_id, record_btrace_frame_prev_register, record_btrace_frame_sniffer, record_btrace_frame_unwind): New. (init_record_btrace_ops): Install it. --- gdb/record-btrace.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/gdb/record-btrace.c b/gdb/record-btrace.c index 26ae6d8..cf30e17 100644 --- a/gdb/record-btrace.c +++ b/gdb/record-btrace.c @@ -33,6 +33,7 @@ #include "symtab.h" #include "filenames.h" #include "regcache.h" +#include "frame-unwind.h" /* The target_ops of record-btrace. */ static struct target_ops record_btrace_ops; @@ -840,6 +841,68 @@ record_btrace_prepare_to_store (struct target_ops *ops, } } +/* Implement stop_reason method for record_btrace_frame_unwind. */ + +static enum unwind_stop_reason +record_btrace_frame_unwind_stop_reason (struct frame_info *this_frame, + void **this_cache) +{ + return UNWIND_UNAVAILABLE; +} + +/* Implement this_id method for record_btrace_frame_unwind. */ + +static void +record_btrace_frame_this_id (struct frame_info *this_frame, void **this_cache, + struct frame_id *this_id) +{ + /* Leave there the outer_frame_id value. */ +} + +/* Implement prev_register method for record_btrace_frame_unwind. */ + +static struct value * +record_btrace_frame_prev_register (struct frame_info *this_frame, + void **this_cache, + int regnum) +{ + throw_error (NOT_AVAILABLE_ERROR, + _("Registers are not available in btrace record history")); +} + +/* Implement sniffer method for record_btrace_frame_unwind. */ + +static int +record_btrace_frame_sniffer (const struct frame_unwind *self, + struct frame_info *this_frame, + void **this_cache) +{ + struct thread_info *tp; + struct btrace_thread_info *btinfo; + struct btrace_insn_iterator *replay; + + /* THIS_FRAME does not contain a reference to its thread. */ + tp = find_thread_ptid (inferior_ptid); + gdb_assert (tp != NULL); + + return btrace_is_replaying (tp); +} + +/* btrace recording does not store previous memory content, neither the stack + frames content. Any unwinding would return errorneous results as the stack + contents no longer matches the changed PC value restored from history. + Therefore this unwinder reports any possibly unwound registers as + . */ + +static const struct frame_unwind record_btrace_frame_unwind = +{ + NORMAL_FRAME, + record_btrace_frame_unwind_stop_reason, + record_btrace_frame_this_id, + record_btrace_frame_prev_register, + NULL, + record_btrace_frame_sniffer +}; /* Initialize the record-btrace target ops. */ static void @@ -870,6 +933,7 @@ init_record_btrace_ops (void) ops->to_fetch_registers = record_btrace_fetch_registers; ops->to_store_registers = record_btrace_store_registers; ops->to_prepare_to_store = record_btrace_prepare_to_store; + ops->to_get_unwinder = &record_btrace_frame_unwind; ops->to_stratum = record_stratum; ops->to_magic = OPS_MAGIC; } -- 1.8.3.1