From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 78105C369C2 for ; Fri, 25 Apr 2025 22:42:25 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1u8ReT-0008Lo-4E; Fri, 25 Apr 2025 18:36:10 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1u8ReG-000897-WF for qemu-riscv@nongnu.org; Fri, 25 Apr 2025 18:35:57 -0400 Received: from mail-wm1-x335.google.com ([2a00:1450:4864:20::335]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1u8ReF-00068P-CJ for qemu-riscv@nongnu.org; Fri, 25 Apr 2025 18:35:56 -0400 Received: by mail-wm1-x335.google.com with SMTP id 5b1f17b1804b1-43edecbfb46so18713035e9.0 for ; Fri, 25 Apr 2025 15:35:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1745620554; x=1746225354; darn=nongnu.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=BGQq+Y71tM+giZAaBHOJOE0+P6uBfAt6Rl6hXPG++qU=; b=AD/IlGpon0/E2uKENUPVtk7XhMk7J710Uo6sBM8qLdRbbSNW9BC0RdaACsrjjICJsl dX2QiW3wRtoebObgMzWYLEtmbMehB2/7OMXfQxzLvaeb/2WfDcID/6gKjmFubfvMRk5y 3mBGoNXl6TlBNDyC/Vt6m6vm+vEtoF7+FtV4Js7ZUKhi4uZhqjUlEKXtiiIXgk+T9Gx/ Eokt1rlnME0xFMcYFfIb+6Qonf2CdQVz0jwo+TBAhHy2TyB4/8CFc/Mmygyk4YXYnAce 8qGhKjQn6X/EfwNfd6LbzPx6dPMBy80JXTxTwFhNhx6wHgeVZ4jP9RAOPjRZiLO6pizg XY0Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1745620554; x=1746225354; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=BGQq+Y71tM+giZAaBHOJOE0+P6uBfAt6Rl6hXPG++qU=; b=tmcwIqJ3It40xG8xvzICkys2sGFrDE1F/NJGgwLDotD5RDxMl96pIHFa9j9f/2z6Wt 3fqumRzmZK9uSqkeAEtX8bgC8TLUuPyCZCF5Zto/er5Up+Ss8Es4BXz35GEld9T2e5bQ QyJKVAXZ+YHhx9lNzKJcBFYnJ0y6r1RsKt8lPiVBHv960m19UVFfQ7E5JbDvEMXb8z9+ 1i0sWyau9J8/+USZlLPAvkA71V+K0enQ10cf6u34Y27PA7PfNO7gluzne5O3k4GegNFC 8YDE7GH+oWBg6wcYGfOWQ9V8+3ijska9f474+wn26AKs7Hu7JW0DVI6lUgdRr2a8Gohg g1sA== X-Gm-Message-State: AOJu0YypSOcs7wxl0oFN2qf2r2DWbFaxeU9nDkI8XLWkzc3ENiJRCIXQ cUJH6l7IfiFsY/0mOad7lylufh38aK/iWg6HkMastfVIv439ETPolK6rx8ORElo= X-Gm-Gg: ASbGncsB0HHQrDk/nh8pMAPi7lh4YfWaDfAW3ahEBEOhfJhECBfFOyQiYqnBWUEw5Vs llEVML61UxsrzUFPjzz4JOp/NVf6zD53xcGd3+lGLA1VS9s76GxzASv7VHfLBRyWe6zGzrFXbtT 3yukcYZgFI5WZ0+6HCefq4BKMXFVFJzU+PdGANgyCwgtupCP18daNDogt+BgGRJ8cy6cjWdWlU1 lbi/tZ8RYPw4vUsAxIyk0pq3Rw6daD2D6bXN+1OOk3PKkXDppnhTDQh1Rl9gA8DtDQIXi1y1e2B WYmXSSDFfyuhrsFTnx04ajcy8EPEKQqPlG8Ngsry5FXrTUhVfwr21r/J8OS9g4B6Wp2Iy1FjGUS u28yjlzsN X-Google-Smtp-Source: AGHT+IHiqRvnBBcQat+Z3TCjfAi/JTfJKuQyZ/XuA4sM1fsR7pbyV1E+h780ulO/uJoCiLVsif/W+A== X-Received: by 2002:a05:600c:1c09:b0:43b:d0fe:b8ac with SMTP id 5b1f17b1804b1-440ab872047mr8237075e9.30.1745620553934; Fri, 25 Apr 2025 15:35:53 -0700 (PDT) Received: from [192.168.69.169] (88-187-86-199.subs.proxad.net. [88.187.86.199]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a073ca556bsm3585046f8f.37.2025.04.25.15.35.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 25 Apr 2025 15:35:52 -0700 (PDT) Message-ID: <4cfc3a69-bae7-41ae-9f82-13eee8a8164e@linaro.org> Date: Sat, 26 Apr 2025 00:35:52 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH alternate 0/2] target/riscv: Fix write_misa vs aligned next_pc To: Richard Henderson , qemu-devel@nongnu.org Cc: qemu-riscv@nongnu.org, alistair.francis@wdc.com, dbarboza@ventanamicro.com References: <20250425165055.807801-1-richard.henderson@linaro.org> Content-Language: en-US From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <20250425165055.807801-1-richard.henderson@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2a00:1450:4864:20::335; envelope-from=philmd@linaro.org; helo=mail-wm1-x335.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-riscv@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-riscv-bounces+qemu-riscv=archiver.kernel.org@nongnu.org Sender: qemu-riscv-bounces+qemu-riscv=archiver.kernel.org@nongnu.org On 25/4/25 18:50, Richard Henderson wrote: > This is an alternate, but less exact approach. It assumes that there > will never be a 16 or 48-bit csr write instruction. This feels dirtier, > but it's a fair assumption involves much less faff. I prefer the other safer version which properly propagate $ra, which could be useful for callees.