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[174.21.142.130]) by smtp.gmail.com with ESMTPSA id l18-20020a056a00141200b004f75395b2cesm18258153pfu.150.2022.03.13.21.43.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 13 Mar 2022 21:43:09 -0700 (PDT) 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=cXCVIH7QbmZmA9NvwqwE9kMzF0Kq89R2K/T6009maKI=; b=dz6nzMwVUdsXRCSMZRwfKSBpmM+u9enzfEceZtKo4p2QXg3hc2AJ08K8gLzBlM/n2T eve6+J5NO0QBj9RMK2hqkYGGe1NBfIMU+mSMK61AhFoDbfj2JeP80mu5YLzVtey1P+bz fat8sT+RQKLby+uCO+E3buy61U4bpBe3III85KVIcbqQesv8kqwV84ruQzPsGkROUS3u 1RQ4L04KUj8p7BrBOzt3kA7nAETTLxzmxmfTY4IHJODM4QZLHirq5s8pyZ7EZTbY/5hZ EoXchcz7zplHkk8+6xHbdn9wyjCmPV9sRGixOde1b1HxKl+jCENCivgLjEg18KqD7Dv3 mCxg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=cXCVIH7QbmZmA9NvwqwE9kMzF0Kq89R2K/T6009maKI=; b=zU7uzWsNKLXCEZDfWcR+gbQCdinLBEkgDJOkAa25IeESiY1UtgILPj6VS7QnBCwsnk JCSg7HTpMK2eneTmYOviT8XfYmqRlYjgxRwSj3BEfN+V3vQ13LHkZbwcwUNqTEj0/QnH WaTtDnEBDnaVGHHZdBJUXQAM4eN8Sik+8ZdufopWg4TGRG5rWyFittXtwOvXNxt0eFBH Vr2EuP8RlTlgL5yZJXswOxSTSyvvwdKIb6rEFuJhC+xlr3C/LQt6EdszBSSjA8I2ppwN D/AkBBxm7LZRHP2Zdt3qhUJYmXNUXU6WgQQVQ6W6zQMQy70I0lj9A+U/D2oa/XBW1Ttz Q+Eg== X-Gm-Message-State: AOAM530lnnkftX2tlC2TlS5MB44+0FpjQIWrl551QXPxY+RaqizJmaFG yuhCiuU8eXWI8ySVSZbI7sukNdbWgxoZ9w== X-Google-Smtp-Source: ABdhPJwfgfmS8ezj51x4Nfaxh485i2kv4htzSXa6za7GUtcEgb9QEqUX/ky+7wVCMDqKFzli/85ZQQ== X-Received: by 2002:a17:90b:4f4e:b0:1bf:88f6:e5b5 with SMTP id pj14-20020a17090b4f4e00b001bf88f6e5b5mr33607904pjb.47.1647232989556; Sun, 13 Mar 2022 21:43:09 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 3/3] linux-user/arm: Implement __kernel_cmpxchg64 with host atomics Date: Sun, 13 Mar 2022 21:43:05 -0700 Message-Id: <20220314044305.138794-4-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220314044305.138794-1-richard.henderson@linaro.org> References: <20220314044305.138794-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::62d (failed) 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::62d; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62d.google.com X-Spam_score_int: -6 X-Spam_score: -0.7 X-Spam_bar: / X-Spam_report: (-0.7 / 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, PDS_HP_HELO_NORDNS=0.659, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-arm@nongnu.org, laurent@vivier.eu Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1647233115529100002 Content-Type: text/plain; charset="utf-8" If CONFIG_ATOMIC64, we can use a host cmpxchg and provide atomicity across processes; otherwise we have no choice but to continue using start/end_exclusive. Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell --- linux-user/arm/cpu_loop.c | 79 +++++++++++++++++++-------------------- 1 file changed, 38 insertions(+), 41 deletions(-) diff --git a/linux-user/arm/cpu_loop.c b/linux-user/arm/cpu_loop.c index 0122bb34f7..d9651f199f 100644 --- a/linux-user/arm/cpu_loop.c +++ b/linux-user/arm/cpu_loop.c @@ -136,7 +136,7 @@ static void arm_kernel_cmpxchg32_helper(CPUARMState *en= v) } =20 /* - * See the Linux kernel's Documentation/arm/kernel_user_helpers.txt + * See the Linux kernel's Documentation/arm/kernel_user_helpers.rst * Input: * r0 =3D pointer to oldval * r1 =3D pointer to newval @@ -153,57 +153,54 @@ static void arm_kernel_cmpxchg64_helper(CPUARMState *= env) { uint64_t oldval, newval, val; uint32_t addr, cpsr; + uint64_t *host_addr; =20 - /* Based on the 32 bit code in do_kernel_trap */ + addr =3D env->regs[0]; + if (get_user_u64(oldval, addr)) { + goto segv; + } =20 - /* XXX: This only works between threads, not between processes. - It's probably possible to implement this with native host - operations. However things like ldrex/strex are much harder so - there's not much point trying. */ - start_exclusive(); - cpsr =3D cpsr_read(env); + addr =3D env->regs[1]; + if (get_user_u64(newval, addr)) { + goto segv; + } + + mmap_lock(); addr =3D env->regs[2]; - - if (get_user_u64(oldval, env->regs[0])) { - env->exception.vaddress =3D env->regs[0]; - goto segv; - }; - - if (get_user_u64(newval, env->regs[1])) { - env->exception.vaddress =3D env->regs[1]; - goto segv; - }; - - if (get_user_u64(val, addr)) { - env->exception.vaddress =3D addr; - goto segv; + host_addr =3D atomic_mmu_lookup(env, addr, 8); + if (!host_addr) { + mmap_unlock(); + return; } =20 +#ifdef CONFIG_ATOMIC64 + val =3D qatomic_cmpxchg__nocheck(host_addr, oldval, newval); + cpsr =3D (val =3D=3D oldval) * CPSR_C; +#else + /* + * This only works between threads, not between processes, but since + * the host has no 64-bit cmpxchg, it is the best that we can do. + */ + start_exclusive(); + val =3D *host_addr; if (val =3D=3D oldval) { - val =3D newval; - - if (put_user_u64(val, addr)) { - env->exception.vaddress =3D addr; - goto segv; - }; - - env->regs[0] =3D 0; - cpsr |=3D CPSR_C; + *host_addr =3D newval; + cpsr =3D CPSR_C; } else { - env->regs[0] =3D -1; - cpsr &=3D ~CPSR_C; + cpsr =3D 0; } - cpsr_write(env, cpsr, CPSR_C, CPSRWriteByInstr); end_exclusive(); +#endif + mmap_unlock(); + + cpsr_write(env, cpsr, CPSR_C, CPSRWriteByInstr); + env->regs[0] =3D cpsr ? 0 : -1; return; =20 -segv: - end_exclusive(); - /* We get the PC of the entry address - which is as good as anything, - on a real kernel what you get depends on which mode it uses. */ - /* XXX: check env->error_code */ - force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MAPERR, - env->exception.vaddress); + segv: + force_sig_fault(TARGET_SIGSEGV, + page_get_flags(addr) & PAGE_VALID ? + TARGET_SEGV_ACCERR : TARGET_SEGV_MAPERR, addr); } =20 /* Handle a jump to the kernel code page. */ --=20 2.25.1