From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.polymtl.ca (smtp.polymtl.ca [132.207.4.11]) by sourceware.org (Postfix) with ESMTPS id 6FDFC3858031 for ; Wed, 8 Nov 2023 05:16:52 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 6FDFC3858031 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=polymtl.ca Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=polymtl.ca ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 6FDFC3858031 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=132.207.4.11 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699420614; cv=none; b=sRqlFm/qR5fNU148ymGUZGofzhNQg1s67M6NKa9Qrg30GHT8ZSa2EJbeBgTsc40efbo2ZyKWu2x8xhnvJchxOlUTTmb4gV53s367awludHSlsxBh2ALttv8QUQdGwNdzTFKkDlONre6cncl+4fqBlOAEfIeWH1TGT7IYVzanPkw= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699420614; c=relaxed/simple; bh=WSviyEOmU4LEszxY1EO1iKw5bSP+8P6Ns9o8DWZGQYM=; h=DKIM-Signature:Message-ID:Date:MIME-Version:Subject:To:From; b=u4MPRm+71/T/CJkZ3kWq+jNE8hb7KtInh7EYGZq5nlmGX72Of/nsvR8WSKJEsPyrhDAdaoZ8ikPw9itVRtdsjyb/yhu6sjS16RwBM4XbuDNyTYLBOpXj7CUnHm1YHkJ9jIb4cQHHtLqvtOmMyDTEPc5Xm+LYEOwpL/NTTarYz+w= ARC-Authentication-Results: i=1; server2.sourceware.org Received: from simark.ca (simark.ca [158.69.221.121]) (authenticated bits=0) by smtp.polymtl.ca (8.14.7/8.14.7) with ESMTP id 3A85Gl3f016064 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 8 Nov 2023 00:16:51 -0500 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp.polymtl.ca 3A85Gl3f016064 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=polymtl.ca; s=default; t=1699420611; bh=bwZkgtS13iD33FOTBf1DZ4fQrbPHiXAxOH30IZeZapY=; h=Date:Subject:To:References:From:In-Reply-To:From; b=rKXU5tgN+OvCYW2qukkFnPKeD8mByFi1rz/KejMA7+lnS+GC0NgGcS4shdSsVnslV W8HXSexnmmcNuyJ1HmTbWOwJzVRsK3V7Lz/3hDIz6ZGIWN+Xt76iddgt/vrmxjL3Cf 7D8KXFJo2/KnH4Azd2Z3kuQ55A48+iOWreCZTEWg= Received: from [10.0.0.11] (modemcable238.237-201-24.mc.videotron.ca [24.201.237.238]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by simark.ca (Postfix) with ESMTPSA id 288661E098 for ; Wed, 8 Nov 2023 00:16:47 -0500 (EST) Message-ID: <2ccd7f93-0728-414e-ae0c-9a80aafed7ac@polymtl.ca> Date: Wed, 8 Nov 2023 00:16:43 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 00/24] Fix reading and writing pseudo registers in non-current frames Content-Language: en-US To: gdb-patches@sourceware.org References: <20231108051222.1275306-1-simon.marchi@polymtl.ca> From: Simon Marchi In-Reply-To: <20231108051222.1275306-1-simon.marchi@polymtl.ca> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Poly-FromMTA: (simark.ca [158.69.221.121]) at Wed, 8 Nov 2023 05:16:47 +0000 X-Spam-Status: No, score=-3031.3 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_PASS,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 2023-11-08 00:00, Simon Marchi wrote: > This series fixes reading/writing pseudo registers from/to non-current > frames (that is, frames other than frame 0). Currently, we get this: > > (gdb) frame 0 > #0 break_here_asm () at /home/smarchi/src/binutils-gdb/gdb/testsuite/gdb.arch/amd64-pseudo-unwind-asm.S:38 > 38 pop %rbx > (gdb) p/x $rbx > $1 = 0x2021222324252627 > (gdb) p/x $ebx > $2 = 0x24252627 > (gdb) frame 1 > #1 0x000055555555517d in caller () at /home/smarchi/src/binutils-gdb/gdb/testsuite/gdb.arch/amd64-pseudo-unwind-asm.S:58 > 58 call callee > (gdb) p/x $rbx > $3 = 0x1011121314151617 > (gdb) p/x $ebx > $4 = 0x24252627 > > This is a bit surprising, we would expect the last value to be > 0x14151617, the bottom half of the rbx value from frame 1 (the currently > selected frame at that point). Instead, we got the bottom half of the > rbx value from frame 0. This is because pseudo registers are always > read/written from/to the current thread's regcache. > > This series fixes this (as well as writing to pseudo registers) by > making it so pseudo registers are read/written using a frame. Ah, I forgot because it's been so long, but this can be considered a v3 of this series here... https://inbox.sourceware.org/gdb-patches/20181024014333.14143-1-simon.marchi@polymtl.ca/ Simon