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[209.51.188.17]) by mx.google.com with ESMTPS id s11si1294000ybl.154.2021.02.10.14.31.21 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Wed, 10 Feb 2021 14:31:21 -0800 (PST) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@linaro.org header.s=google header.b="NP7/0bpw"; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1]:34696 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l9y12-00006Y-WD for patch@linaro.org; Wed, 10 Feb 2021 17:31:21 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:56962) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l9xhp-0006MK-8o for qemu-devel@nongnu.org; Wed, 10 Feb 2021 17:11:30 -0500 Received: from mail-wm1-x330.google.com ([2a00:1450:4864:20::330]:55736) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1l9xhd-0003Ka-Dr for qemu-devel@nongnu.org; Wed, 10 Feb 2021 17:11:28 -0500 Received: by mail-wm1-x330.google.com with SMTP id o15so1414629wmq.5 for ; Wed, 10 Feb 2021 14:11:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=V8hRFPoVc8c8eXrlr06JCpkJWOT8xslFBNNz5Wo6GrU=; b=NP7/0bpwusTxvB0ZhU+x0q1nVL4wyjUhWnuD++OoZz/gHQyzI6yHJnv0F6IgHS1D5M mEPcBkWsV30X8fIWbpKWB59bea7gPPt7KaezQapMch5rBqnBH6Ogj/x33L5EvUBIdaNU NHzU48FjGCVkHkNJ0UiPO1Nzoje/OxViKYBGSh4QatSGTuDyvOU/VrGVY6IWNWfvQKre U29u4RQD/YxUyAV3PGg5axBgyHlCS/8QYTuEogpWYAlbHcExyhm5Xski+PHASZwLTgxc z2u+ErGXNaOKgvj9q9XnDWTg4e+RZleFlnCd0GRVHfWr0LWMM0YoRnwD/+OBuD1s5mZ2 LBoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=V8hRFPoVc8c8eXrlr06JCpkJWOT8xslFBNNz5Wo6GrU=; b=XZp0xb5enmNMeNzrT1uR1c2qnAMYEgZBmed/x9HsQNefMY8y8598ER8nM4upRmk/Fk AvwkFqDfa5r+HVZ9mN/np/KYSLrCOsn01DmOX5pw3DgTO+uUsKeiVJ7rzjSwmpW2/dkK 9yCy2QB+aDgDCJfEZvrGlCJg9qktCqtJ2QyRigUkZlMt7VAwGN0pzjYgQiYHLHo2AGEe wNiZVVRSwgo3dGEhxkEqRHnb7kTFaF6CN828QVFsvzA1O+gFHnCk4ubHzxaHMqenl5Bx xIHxRTjjL7YBcoXN1Dm+rNBIfMn9k3JEqKuWNUQPjt1U/iN7nqV695IVEJPMafhyA5zP LLtg== X-Gm-Message-State: AOAM533iU2kN1QVcFFSdWZtXvSqnkX6Ia0WzUaVnzLtaZfSY/lMlOl/Z w23gv3ZKxoAcyO9yadPEKegZbg== X-Received: by 2002:a05:600c:4105:: with SMTP id j5mr1237592wmi.0.1612995076109; Wed, 10 Feb 2021 14:11:16 -0800 (PST) Received: from zen.linaroharston ([51.148.130.216]) by smtp.gmail.com with ESMTPSA id u142sm5099604wmu.3.2021.02.10.14.11.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Feb 2021 14:11:13 -0800 (PST) Received: from zen.lan (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id A2E8A1FF9A; Wed, 10 Feb 2021 22:10:54 +0000 (GMT) From: =?utf-8?q?Alex_Benn=C3=A9e?= To: qemu-devel@nongnu.org Subject: [PATCH v2 11/21] accel/tcg: Create io_recompile_replay_branch hook Date: Wed, 10 Feb 2021 22:10:43 +0000 Message-Id: <20210210221053.18050-12-alex.bennee@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210210221053.18050-1-alex.bennee@linaro.org> References: <20210210221053.18050-1-alex.bennee@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::330; envelope-from=alex.bennee@linaro.org; helo=mail-wm1-x330.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-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Richard Henderson , robhenry@microsoft.com, mahmoudabdalghany@outlook.com, aaron@os.amperecomputing.com, cota@braap.org, Paolo Bonzini , kuhn.chenqun@huawei.com, =?utf-8?q?Alex_Benn=C3=A9e?= Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" From: Richard Henderson Create a hook in which to split out the mips and sh4 ifdefs from cpu_io_recompile. [AJB: s/stoped/stopped/] Signed-off-by: Richard Henderson Signed-off-by: Alex Bennée Reviewed-by: Alex Bennée Message-Id: <20210208233906.479571-3-richard.henderson@linaro.org> Message-Id: <20210209182749.31323-3-alex.bennee@linaro.org> --- include/hw/core/tcg-cpu-ops.h | 10 ++++++++++ accel/tcg/translate-all.c | 17 +++++++++++++---- 2 files changed, 23 insertions(+), 4 deletions(-) -- 2.20.1 Reviewed-by: Philippe Mathieu-Daudé diff --git a/include/hw/core/tcg-cpu-ops.h b/include/hw/core/tcg-cpu-ops.h index ac3bb051f2..72d791438c 100644 --- a/include/hw/core/tcg-cpu-ops.h +++ b/include/hw/core/tcg-cpu-ops.h @@ -88,6 +88,16 @@ struct TCGCPUOps { */ bool (*debug_check_watchpoint)(CPUState *cpu, CPUWatchpoint *wp); + /** + * @io_recompile_replay_branch: Callback for cpu_io_recompile. + * + * The cpu has been stopped, and cpu_restore_state_from_tb has been + * called. If the faulting instruction is in a delay slot, and the + * target architecture requires re-execution of the branch, then + * adjust the cpu state as required and return true. + */ + bool (*io_recompile_replay_branch)(CPUState *cpu, + const TranslationBlock *tb); #endif /* CONFIG_SOFTMMU */ #endif /* NEED_CPU_H */ diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c index 81d4c83f22..6eb37883bd 100644 --- a/accel/tcg/translate-all.c +++ b/accel/tcg/translate-all.c @@ -60,6 +60,7 @@ #include "sysemu/cpu-timers.h" #include "sysemu/tcg.h" #include "qapi/error.h" +#include "hw/core/tcg-cpu-ops.h" #include "internal.h" /* #define DEBUG_TB_INVALIDATE */ @@ -2420,6 +2421,7 @@ void cpu_io_recompile(CPUState *cpu, uintptr_t retaddr) CPUArchState *env = cpu->env_ptr; #endif TranslationBlock *tb; + CPUClass *cc; uint32_t n; tb = tcg_tb_lookup(retaddr); @@ -2429,11 +2431,18 @@ void cpu_io_recompile(CPUState *cpu, uintptr_t retaddr) } cpu_restore_state_from_tb(cpu, tb, retaddr, true); - /* On MIPS and SH, delay slot instructions can only be restarted if - they were already the first instruction in the TB. If this is not - the first instruction in a TB then re-execute the preceding - branch. */ + /* + * Some guests must re-execute the branch when re-executing a delay + * slot instruction. When this is the case, adjust icount and N + * to account for the re-execution of the branch. + */ n = 1; + cc = CPU_GET_CLASS(cpu); + if (cc->tcg_ops->io_recompile_replay_branch && + cc->tcg_ops->io_recompile_replay_branch(cpu, tb)) { + cpu_neg(cpu)->icount_decr.u16.low++; + n = 2; + } #if defined(TARGET_MIPS) if ((env->hflags & MIPS_HFLAG_BMASK) != 0 && env->active_tc.PC != tb->pc) {