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[173.197.107.21]) by smtp.gmail.com with ESMTPSA id u12sm2010pfh.98.2021.01.05.09.20.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Jan 2021 09:20:08 -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=wFm6MDTFivie1E/Xe2P9hEcJO2tCRms/0WVX0C0Bj2Q=; b=jw4rWHdVAEZZcIaU+Pb4omEybixJ04qc/T7/Q+tatFUsguJ51Wd8Dcwi0BGJqh3NLh JgflBzJU2DnkhPYJFVmsgzNZR5SVw0SLlS0boF0vypgut8KZpfxlzS7ntbt6vgOU+Jbt c54OHl6ZoceJWZAHDpJ6iIERzIewCe3Dmqql7Ywa9AfUatozAfSPOdL7Vjy2aT1zqTE8 hDO3RnH7wisKg3dTGJ974ypMIOLikTapnycWkYLbFhQo0A/7KJZy6cuFXACY7sGlafTt MkbzJP6Q2+wc5S/D05j1jBFBtATxEdRjgIGQQymXfGgEsHV6sEQG6OTrLwcN5gx18hL+ puAg== 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=wFm6MDTFivie1E/Xe2P9hEcJO2tCRms/0WVX0C0Bj2Q=; b=WgXWXx1iRGQ72CpVb5pjb0u+gNmNKjfdi/ND7kIUYitslvz4EGnj8Aahjsz2q7xiqE 78OYH1QKL3m7Bby2NqeZ+B6Tifs3Vz3VctgUPWjXQcU005Bvh3+6Nd03ypP2ocarkx/x DX59/HVLKpQkdeiJaV6LeLH19LEgogpf+bL4qENOssbOWBZWekYoUdeAVbWthZPSmyoo 66M1A8k54+KPPNYD3CR1n/+OhfialnSQh819/7FGXMktqWzFvyTZcTzbOmncSUyDX3h7 1oh/3LBt/ebfrENZgBaT45umV7Sa+gKZOg4KEiDNPvhapu2y7D7+bpZXOs9OUq4mZ4d6 QecA== X-Gm-Message-State: AOAM530WJ4N2wUOtGc0/Zt9s83/kpFTNFyMGlgcbnWzMJaWwf8sSSwhr LM3MhA6QBl+33TaFU8uapeBdWPDtZS4p/A== X-Google-Smtp-Source: ABdhPJymkQ1VfYxQ//Z5ISohjRk3FUKg4FxxqCJKgLrWto3thBnhPA2UHd/8l7ui5Hj9b8vtWUEbAA== X-Received: by 2002:a17:90b:4394:: with SMTP id in20mr300466pjb.34.1609867209396; Tue, 05 Jan 2021 09:20:09 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v5 07/43] tcg: Add in_code_gen_buffer Date: Tue, 5 Jan 2021 07:19:14 -1000 Message-Id: <20210105171950.415486-8-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210105171950.415486-1-richard.henderson@linaro.org> References: <20210105171950.415486-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::636; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x636.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: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) Create a function to determine if a pointer is within the buffer. Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Richard Henderson --- include/tcg/tcg.h | 11 +++++++++++ accel/tcg/translate-all.c | 26 ++++++++------------------ 2 files changed, 19 insertions(+), 18 deletions(-) diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h index bb1e97b13b..ef571b6f3e 100644 --- a/include/tcg/tcg.h +++ b/include/tcg/tcg.h @@ -680,6 +680,17 @@ extern __thread TCGContext *tcg_ctx; extern void *tcg_code_gen_epilogue; extern TCGv_env cpu_env; =20 +static inline bool in_code_gen_buffer(const void *p) +{ + const TCGContext *s =3D &tcg_init_ctx; + /* + * Much like it is valid to have a pointer to the byte past the + * end of an array (so long as you don't dereference it), allow + * a pointer to the byte past the end of the code gen buffer. + */ + return (size_t)(p - s->code_gen_buffer) <=3D s->code_gen_buffer_size; +} + static inline size_t temp_idx(TCGTemp *ts) { ptrdiff_t n =3D ts - tcg_ctx->temps; diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c index b7d50a73d4..9f5879b63f 100644 --- a/accel/tcg/translate-all.c +++ b/accel/tcg/translate-all.c @@ -392,27 +392,18 @@ void tb_destroy(TranslationBlock *tb) =20 bool cpu_restore_state(CPUState *cpu, uintptr_t host_pc, bool will_exit) { - TranslationBlock *tb; - bool r =3D false; - uintptr_t check_offset; - - /* The host_pc has to be in the region of current code buffer. If - * it is not we will not be able to resolve it here. The two cases - * where host_pc will not be correct are: + /* + * The host_pc has to be in the region of the code buffer. + * If it is not we will not be able to resolve it here. + * The two cases where host_pc will not be correct are: * * - fault during translation (instruction fetch) * - fault from helper (not using GETPC() macro) * * Either way we need return early as we can't resolve it here. - * - * We are using unsigned arithmetic so if host_pc < - * tcg_init_ctx.code_gen_buffer check_offset will wrap to way - * above the code_gen_buffer_size */ - check_offset =3D host_pc - (uintptr_t) tcg_init_ctx.code_gen_buffer; - - if (check_offset < tcg_init_ctx.code_gen_buffer_size) { - tb =3D tcg_tb_lookup(host_pc); + if (in_code_gen_buffer((const void *)host_pc)) { + TranslationBlock *tb =3D tcg_tb_lookup(host_pc); if (tb) { cpu_restore_state_from_tb(cpu, tb, host_pc, will_exit); if (tb_cflags(tb) & CF_NOCACHE) { @@ -421,11 +412,10 @@ bool cpu_restore_state(CPUState *cpu, uintptr_t host_= pc, bool will_exit) tcg_tb_remove(tb); tb_destroy(tb); } - r =3D true; + return true; } } - - return r; + return false; } =20 static void page_init(void) --=20 2.25.1