From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756633AbcBETO4 (ORCPT ); Fri, 5 Feb 2016 14:14:56 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:55757 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756433AbcBETOw (ORCPT ); Fri, 5 Feb 2016 14:14:52 -0500 From: Tyler Baicar To: fu.wei@linaro.org, timur@codeaurora.org, harba@codeaurora.org, rruigrok@codeaurora.org, ahs3@redhat.com, Catalin Marinas , Will Deacon , "Rafael J. Wysocki" , Len Brown , Matt Fleming , Robert Moore , Lv Zheng , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-efi@vger.kernel.org, devel@acpica.org Cc: Tyler Baicar , Naveen Kaje Subject: [PATCH V1 5/6] arm64: exception: handle instruction abort at current EL Date: Fri, 5 Feb 2016 12:13:27 -0700 Message-Id: <1454699608-22760-6-git-send-email-tbaicar@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1454699608-22760-1-git-send-email-tbaicar@codeaurora.org> References: <1454699608-22760-1-git-send-email-tbaicar@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a handler for instruction aborts at the current EL (ESR_ELx_EC_IABT_CUR) so they are no longer handled in el1_inv. This allows firmware first handling for possible SEA (Synchronous External Abort) caused instruction abort at current EL. Signed-off-by: Tyler Baicar Signed-off-by: Naveen Kaje --- arch/arm64/kernel/entry.S | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 1f7f5a2..6b7fb14 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -336,6 +336,8 @@ el1_sync: lsr x24, x1, #ESR_ELx_EC_SHIFT // exception class cmp x24, #ESR_ELx_EC_DABT_CUR // data abort in EL1 b.eq el1_da + cmp x24, #ESR_ELx_EC_IABT_CUR // instruction abort in EL1 + b.eq el1_ia cmp x24, #ESR_ELx_EC_SYS64 // configurable trap b.eq el1_undef cmp x24, #ESR_ELx_EC_SP_ALIGN // stack alignment exception @@ -363,6 +365,23 @@ el1_da: // disable interrupts before pulling preserved data off the stack disable_irq kernel_exit 1 +el1_ia: + /* + * Instruction abort handling + */ + mrs x0, far_el1 + enable_dbg + // re-enable interrupts if they were enabled in the aborted context + tbnz x23, #7, 1f // PSR_I_BIT + enable_irq +1: + orr x1, x1, #1 << 24 // use reserved ISS bit for instruction aborts + mov x2, sp // struct pt_regs + bl do_mem_abort + + // disable interrupts before pulling preserved data off the stack + disable_irq + kernel_exit 1 el1_sp_pc: /* * Stack or PC alignment exception handling -- 1.8.2.1