From patchwork Thu Feb 27 17:44:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 11409077 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0E00A14BC for ; Thu, 27 Feb 2020 17:45:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E19E4246B2 for ; Thu, 27 Feb 2020 17:45:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582825506; bh=Y9RGRUHIi6qkk5wya965oATudtCpKBHHkgm9GJfHUoc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ro3Ar12jRmBtEfU5s1aatLm260a+7LhUsNcFF0/783yZ9qWSc2BoY/EIFeYKwOqCq zLLPp3V+7Cyewz/b+9Wuzd0LlePcu/pWCSUrFXfFm59t9WVR7kfugJKhqvrGkEQngY xhvK0omtpumIRjFwk71X6ufRWfj4ky/oQIm242xQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730652AbgB0Roh (ORCPT ); Thu, 27 Feb 2020 12:44:37 -0500 Received: from foss.arm.com ([217.140.110.172]:55592 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730623AbgB0Rog (ORCPT ); Thu, 27 Feb 2020 12:44:36 -0500 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 9C8B511B3; Thu, 27 Feb 2020 09:44:35 -0800 (PST) Received: from localhost (unknown [10.37.6.21]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id DD3613F73B; Thu, 27 Feb 2020 09:44:34 -0800 (PST) From: Mark Brown To: Catalin Marinas , Will Deacon Cc: Alexander Viro , Paul Elliott , Peter Zijlstra , Yu-cheng Yu , Amit Kachhap , Vincenzo Frascino , Marc Zyngier , Eugene Syromiatnikov , Szabolcs Nagy , "H . J . Lu " , Andrew Jones , Kees Cook , Arnd Bergmann , Jann Horn , Richard Henderson , =?utf-8?q?Kristina_Mart?= =?utf-8?q?=C5=A1enko?= , Thomas Gleixner , Florian Weimer , Sudakshina Das , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, Dave Martin , Mark Brown Subject: [PATCH v8 06/11] arm64: BTI: Decode BYTPE bits when printing PSTATE Date: Thu, 27 Feb 2020 17:44:12 +0000 Message-Id: <20200227174417.23722-7-broonie@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200227174417.23722-1-broonie@kernel.org> References: <20200227174417.23722-1-broonie@kernel.org> MIME-Version: 1.0 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Dave Martin The current code to print PSTATE symbolically when generating backtraces etc., does not include the BYTPE field used by Branch Target Identification. So, decode BYTPE and print it too. In the interests of human-readability, print the classes of BTI matched. The symbolic notation, BYTPE (PSTATE[11:10]) and permitted classes of subsequent instruction are: -- (BTYPE=0b00): any insn jc (BTYPE=0b01): BTI jc, BTI j, BTI c, PACIxSP -c (BYTPE=0b10): BTI jc, BTI c, PACIxSP j- (BTYPE=0b11): BTI jc, BTI j Signed-off-by: Dave Martin Reviewed-by: Kees Cook Signed-off-by: Mark Brown --- arch/arm64/kernel/process.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index b8e3faa8d406..24af13d7bde6 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -211,6 +211,15 @@ void machine_restart(char *cmd) while (1); } +#define bstr(suffix, str) [PSR_BTYPE_ ## suffix >> PSR_BTYPE_SHIFT] = str +static const char *const btypes[] = { + bstr(NONE, "--"), + bstr( JC, "jc"), + bstr( C, "-c"), + bstr( J , "j-") +}; +#undef bstr + static void print_pstate(struct pt_regs *regs) { u64 pstate = regs->pstate; @@ -229,7 +238,10 @@ static void print_pstate(struct pt_regs *regs) pstate & PSR_AA32_I_BIT ? 'I' : 'i', pstate & PSR_AA32_F_BIT ? 'F' : 'f'); } else { - printk("pstate: %08llx (%c%c%c%c %c%c%c%c %cPAN %cUAO)\n", + const char *btype_str = btypes[(pstate & PSR_BTYPE_MASK) >> + PSR_BTYPE_SHIFT]; + + printk("pstate: %08llx (%c%c%c%c %c%c%c%c %cPAN %cUAO BTYPE=%s)\n", pstate, pstate & PSR_N_BIT ? 'N' : 'n', pstate & PSR_Z_BIT ? 'Z' : 'z', @@ -240,7 +252,8 @@ static void print_pstate(struct pt_regs *regs) pstate & PSR_I_BIT ? 'I' : 'i', pstate & PSR_F_BIT ? 'F' : 'f', pstate & PSR_PAN_BIT ? '+' : '-', - pstate & PSR_UAO_BIT ? '+' : '-'); + pstate & PSR_UAO_BIT ? '+' : '-', + btype_str); } }