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[173.197.107.21]) by smtp.gmail.com with ESMTPSA id v6sm6516265pfi.31.2021.01.07.12.15.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Jan 2021 12:15:11 -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=9ERcwQ1o1WQCtk37LfWcrGwhEwI+ExpBZ4567jVnbB8=; b=koyIZqoBQWXXGphDxv9A1v7hB4X6F300OVwcEYLBHLbChdyP8qBIAW/3Q360Kr7YQu 8hMC1MB9VvuZM8OPPLaAgy8tkpaEX9MxC9YkvlHxoE+qLm5cH7IiKvu4j6Qkil7Qr0s0 0H8589l97rPKA1cGAFAf3LRLEkHMV2FqOaL/7DT+cl6b36ktZ1UcEaCX7pirYgcyzN4l rjiUqxbRzNqasgPa3rgCy4V6YwZ16GyCYZjiT+HUlMsfCHTOon/AsSK4fivCPx7nsHuy iD6W8I0cr33F6HRWRz/M7Lzr22RmOiyV+v+RP2vScAurBU0QJtfB1blTInqc30zUVgrR Na+g== 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=9ERcwQ1o1WQCtk37LfWcrGwhEwI+ExpBZ4567jVnbB8=; b=Jq5Dl6z+ZQFGy4ZKNDyIbSAegiFL0zkmExswQ9Wo9isa1d0YuA366Diz1a9An0JR51 ONcial9BClBFpAvxbdXw8QjiL/TxiMJN3OOypvt1JpjK/eCDxrMRpCzwZZW8w+QYCKcn VvbqrjhDtvHWjzQTIx2bS29bQt4aI1oP0ydijOEWdITDgRmoZstfhLH6FmoFsHz4h48d fe63enrinbCkVpSnQckx6bxrZNHtyNmrcOMx2lrWXk60Hx0hkBfHLE116gyZlMoHLV6l VFkV3yfZHIh+wrs6a9x4DqtfPh/9TM/W/SH5mnQoJUxFwrQoNTdCSac83WFcQ/lgH1mV eaGw== X-Gm-Message-State: AOAM5302DsFhpuq95eTRDp/RujvJMsDIDEm6K4/LB5GssrzRjSTOFtkb gCK14RUHBttKcv8c5+lfGXNSY3FWDiPRPw== X-Google-Smtp-Source: ABdhPJwKzFG0EJNr2/4sXB5JX7r6ko2Vh/YooA2hhcFSCjck1Zf8wTEoo99Ys0fzTMJS+ej1oXm5og== X-Received: by 2002:a17:90a:5b:: with SMTP id 27mr154834pjb.207.1610050512311; Thu, 07 Jan 2021 12:15:12 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PULL 11/47] tcg: Add in_code_gen_buffer Date: Thu, 7 Jan 2021 10:14:12 -1000 Message-Id: <20210107201448.1152301-12-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210107201448.1152301-1-richard.henderson@linaro.org> References: <20210107201448.1152301-1-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::633; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x633.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=unavailable 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: peter.maydell@linaro.org, =?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 a1803a1026..3f9e25fa0c 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