From patchwork Thu Aug 22 15:11:03 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joey Gouly X-Patchwork-Id: 13773853 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 3C3B9C531DF for ; Thu, 22 Aug 2024 15:53:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Q2RRx8rLkC5P4E8tx9Rk6lKwVPDwmtzasYWwFlURekc=; b=HwEwoM4wvJU1lADNSLVwoIRYBy Qlpab/hgxYBywLIgNGkni5vhYmxK3OytzBNPoVzgry1M6Tf8TSKX82gE2ZzZFrYK+0LDR0iJFdZZT 5oYe3/tXojaCHpdr1I3NOCVhq3gSbBpk/l6T4BjlPGgm0/6M0T7mRSTo2wBGigj86XGmP7s6hhT10 FmC5XK9SalDrvprNkxjkduxbEd0+HMxZRS8FwQY14rIx7NFPLWX9XtmK8Y3r5gpICSSOVZbmoUT2c 953B/nXNYt6aemOY31eB81I40GlIgFnIjgdgYnNrc0JScz0CpdGVAv4GGVVSNNAY3S9E8LBdjnGR1 Whaj5t/Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1shA7F-0000000DPth-410G; Thu, 22 Aug 2024 15:52:49 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sh9Ud-0000000DIYZ-2g2M for linux-arm-kernel@bombadil.infradead.org; Thu, 22 Aug 2024 15:12:55 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=Q2RRx8rLkC5P4E8tx9Rk6lKwVPDwmtzasYWwFlURekc=; b=XaI1TR8KO5thLH/SUSKO4ptJpq b1nIegaS7lLVfw/byaqOOvH6noFMCzZfYVKL7ovACjQVda7RAjqcFm0Oz9jLoX96NxFJj6naOLHiO ZiXWv0oyj42vd81kSxW0LSdedkJciukbG/eGpG/yWIklf902XkJCeVGS6581MDm36xvcK0H22Vz01 Pk4ktLH7v/z6JWvvdxv0t06UP06bDNYNfN9HoMH6tpWJKHBzH5vQ4t4G+XOOdIvcx3WXAFkSl0GWs qPrVNjj3PISz/8iv0gKm1Eu35wcFTqBrFrtEgdd5IQqU3TQhcia8wFMNcgN1V9ukHLthybhTMk4z9 Bvdw2E+A==; Received: from foss.arm.com ([217.140.110.172]) by desiato.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sh9Ua-00000009yNU-0FCL for linux-arm-kernel@lists.infradead.org; Thu, 22 Aug 2024 15:12:54 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E136A1595; Thu, 22 Aug 2024 08:13:16 -0700 (PDT) Received: from e124191.cambridge.arm.com (e124191.cambridge.arm.com [10.1.197.45]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C28523F58B; Thu, 22 Aug 2024 08:12:46 -0700 (PDT) From: Joey Gouly To: linux-arm-kernel@lists.infradead.org Cc: nd@arm.com, akpm@linux-foundation.org, aneesh.kumar@kernel.org, aneesh.kumar@linux.ibm.com, anshuman.khandual@arm.com, bp@alien8.de, broonie@kernel.org, catalin.marinas@arm.com, christophe.leroy@csgroup.eu, dave.hansen@linux.intel.com, hpa@zytor.com, joey.gouly@arm.com, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, maz@kernel.org, mingo@redhat.com, mpe@ellerman.id.au, naveen.n.rao@linux.ibm.com, npiggin@gmail.com, oliver.upton@linux.dev, shuah@kernel.org, skhan@linuxfoundation.org, szabolcs.nagy@arm.com, tglx@linutronix.de, will@kernel.org, x86@kernel.org, kvmarm@lists.linux.dev, linux-kselftest@vger.kernel.org Subject: [PATCH v5 20/30] arm64/ptrace: add support for FEAT_POE Date: Thu, 22 Aug 2024 16:11:03 +0100 Message-Id: <20240822151113.1479789-21-joey.gouly@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240822151113.1479789-1-joey.gouly@arm.com> References: <20240822151113.1479789-1-joey.gouly@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240822_161252_629831_DF20EE35 X-CRM114-Status: GOOD ( 13.79 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a regset for POE containing POR_EL0. Signed-off-by: Joey Gouly Cc: Catalin Marinas Cc: Will Deacon Reviewed-by: Mark Brown Reviewed-by: Catalin Marinas Reviewed-by: Anshuman Khandual --- arch/arm64/kernel/ptrace.c | 46 ++++++++++++++++++++++++++++++++++++++ include/uapi/linux/elf.h | 1 + 2 files changed, 47 insertions(+) diff --git arch/arm64/kernel/ptrace.c arch/arm64/kernel/ptrace.c index 0d022599eb61..b756578aeaee 100644 --- arch/arm64/kernel/ptrace.c +++ arch/arm64/kernel/ptrace.c @@ -1440,6 +1440,39 @@ static int tagged_addr_ctrl_set(struct task_struct *target, const struct } #endif +#ifdef CONFIG_ARM64_POE +static int poe_get(struct task_struct *target, + const struct user_regset *regset, + struct membuf to) +{ + if (!system_supports_poe()) + return -EINVAL; + + return membuf_write(&to, &target->thread.por_el0, + sizeof(target->thread.por_el0)); +} + +static int poe_set(struct task_struct *target, const struct + user_regset *regset, unsigned int pos, + unsigned int count, const void *kbuf, const + void __user *ubuf) +{ + int ret; + long ctrl; + + if (!system_supports_poe()) + return -EINVAL; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl, 0, -1); + if (ret) + return ret; + + target->thread.por_el0 = ctrl; + + return 0; +} +#endif + enum aarch64_regset { REGSET_GPR, REGSET_FPR, @@ -1469,6 +1502,9 @@ enum aarch64_regset { #ifdef CONFIG_ARM64_TAGGED_ADDR_ABI REGSET_TAGGED_ADDR_CTRL, #endif +#ifdef CONFIG_ARM64_POE + REGSET_POE +#endif }; static const struct user_regset aarch64_regsets[] = { @@ -1628,6 +1664,16 @@ static const struct user_regset aarch64_regsets[] = { .set = tagged_addr_ctrl_set, }, #endif +#ifdef CONFIG_ARM64_POE + [REGSET_POE] = { + .core_note_type = NT_ARM_POE, + .n = 1, + .size = sizeof(long), + .align = sizeof(long), + .regset_get = poe_get, + .set = poe_set, + }, +#endif }; static const struct user_regset_view user_aarch64_view = { diff --git include/uapi/linux/elf.h include/uapi/linux/elf.h index b54b313bcf07..81762ff3c99e 100644 --- include/uapi/linux/elf.h +++ include/uapi/linux/elf.h @@ -441,6 +441,7 @@ typedef struct elf64_shdr { #define NT_ARM_ZA 0x40c /* ARM SME ZA registers */ #define NT_ARM_ZT 0x40d /* ARM SME ZT registers */ #define NT_ARM_FPMR 0x40e /* ARM floating point mode register */ +#define NT_ARM_POE 0x40f /* ARM POE registers */ #define NT_ARC_V2 0x600 /* ARCv2 accumulator/extra registers */ #define NT_VMCOREDD 0x700 /* Vmcore Device Dump Note */ #define NT_MIPS_DSP 0x800 /* MIPS DSP ASE registers */