Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753707AbdFMOEw (ORCPT ); Tue, 13 Jun 2017 10:04:52 -0400 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:50603 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753403AbdFMOEK (ORCPT ); Tue, 13 Jun 2017 10:04:10 -0400 From: Noam Camus To: linux-snps-arc@lists.infradead.org Cc: linux-kernel@vger.kernel.org, Liav Rehana , Noam Camus Subject: [PATCH v2 11/12] ARC: [plat-eznps] handle dedicated AUX registers Date: Tue, 13 Jun 2017 17:03:55 +0300 Message-Id: <1497362636-30353-12-git-send-email-noamca@mellanox.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1497362636-30353-1-git-send-email-noamca@mellanox.com> References: <1497362636-30353-1-git-send-email-noamca@mellanox.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2907 Lines: 106 From: Liav Rehana Preserve eflags and gpa1 auxiliaries during exception Registers used by compare exchange instructions. GPA1 is used for compare value, and EFLAGS got bit reflects atomic operation response. EFLAGS is zeroed for each new user task so it won't get its parent value. Signed-off-by: Noam Camus --- arch/arc/include/asm/entry-compact.h | 24 ++++++++++++++++++++++++ arch/arc/include/asm/ptrace.h | 5 +++++ arch/arc/kernel/process.c | 4 ++++ 3 files changed, 33 insertions(+), 0 deletions(-) diff --git a/arch/arc/include/asm/entry-compact.h b/arch/arc/include/asm/entry-compact.h index 14c310f..9e4458a 100644 --- a/arch/arc/include/asm/entry-compact.h +++ b/arch/arc/include/asm/entry-compact.h @@ -192,6 +192,12 @@ PUSHAX lp_start PUSHAX erbta +#ifdef CONFIG_ARC_PLAT_EZNPS + .word CTOP_INST_SCHD_RW + PUSHAX CTOP_AUX_GPA1 + PUSHAX CTOP_AUX_EFLAGS +#endif +` lr r9, [ecr] st r9, [sp, PT_event] /* EV_Trap expects r9 to have ECR */ .endm @@ -208,6 +214,12 @@ * by hardware and that is not good. *-------------------------------------------------------------*/ .macro EXCEPTION_EPILOGUE +#ifdef CONFIG_ARC_PLAT_EZNPS + .word CTOP_INST_SCHD_RW + POPAX CTOP_AUX_EFLAGS + POPAX CTOP_AUX_GPA1 +#endif + POPAX erbta POPAX lp_start POPAX lp_end @@ -265,6 +277,12 @@ PUSHAX lp_end PUSHAX lp_start PUSHAX bta_l\LVL\() + +#ifdef CONFIG_ARC_PLAT_EZNPS + .word CTOP_INST_SCHD_RW + PUSHAX CTOP_AUX_GPA1 + PUSHAX CTOP_AUX_EFLAGS +#endif .endm /*-------------------------------------------------------------- @@ -277,6 +295,12 @@ * by hardware and that is not good. *-------------------------------------------------------------*/ .macro INTERRUPT_EPILOGUE LVL +#ifdef CONFIG_ARC_PLAT_EZNPS + .word CTOP_INST_SCHD_RW + POPAX CTOP_AUX_EFLAGS + POPAX CTOP_AUX_GPA1 +#endif + POPAX bta_l\LVL\() POPAX lp_start POPAX lp_end diff --git a/arch/arc/include/asm/ptrace.h b/arch/arc/include/asm/ptrace.h index 5297faa..5a8cb22 100644 --- a/arch/arc/include/asm/ptrace.h +++ b/arch/arc/include/asm/ptrace.h @@ -19,6 +19,11 @@ #ifdef CONFIG_ISA_ARCOMPACT struct pt_regs { +#ifdef CONFIG_ARC_PLAT_EZNPS + unsigned long eflags; /* Extended FLAGS */ + unsigned long gpa1; /* General Purpose Aux */ +#endif + /* Real registers */ unsigned long bta; /* bta_l1, bta_l2, erbta */ diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c index 5c631a1..5ac3b54 100644 --- a/arch/arc/kernel/process.c +++ b/arch/arc/kernel/process.c @@ -234,6 +234,10 @@ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long usp) */ regs->status32 = STATUS_U_MASK | STATUS_L_MASK | ISA_INIT_STATUS_BITS; +#ifdef CONFIG_EZNPS_MTM_EXT + regs->eflags = 0; +#endif + /* bogus seed values for debugging */ regs->lp_start = 0x10; regs->lp_end = 0x80; -- 1.7.1