From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3xC4N510XFzDrM9 for ; Wed, 19 Jul 2017 14:50:28 +1000 (AEST) From: Benjamin Herrenschmidt To: linuxppc-dev@lists.ozlabs.org Cc: aneesh.kumar@linux.vnet.ibm.com, Benjamin Herrenschmidt Subject: [PATCH 03/24] powerpc/6xx: Handle DABR match before calling do_page_fault Date: Wed, 19 Jul 2017 14:49:25 +1000 Message-Id: <20170719044946.22030-3-benh@kernel.crashing.org> In-Reply-To: <20170719044946.22030-1-benh@kernel.crashing.org> References: <20170719044946.22030-1-benh@kernel.crashing.org> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On legacy 6xx 32-bit procesors, we checked for the DABR match bit in DSISR from do_page_fault(), in the middle of a pile of ifdef's because all other CPU types do it in assembly prior to calling do_page_fault. Fix that. Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/entry_32.S | 11 +++++++++++ arch/powerpc/mm/fault.c | 9 --------- 2 files changed, 11 insertions(+), 9 deletions(-) diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 8587059ad848..7331df033804 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -586,6 +586,8 @@ ppc_swapcontext: handle_page_fault: stw r4,_DAR(r1) addi r3,r1,STACK_FRAME_OVERHEAD + andis. r0,r5,DSISR_DABRMATCH@h + bne- handle_dabr_fault bl do_page_fault cmpwi r3,0 beq+ ret_from_except @@ -599,6 +601,15 @@ handle_page_fault: bl bad_page_fault b ret_from_except_full + /* We have a data breakpoint exception - handle it */ +handle_dabr_fault: + SAVE_NVGPRS(r1) + lwz r0,_TRAP(r1) + clrrwi r0,r0,1 + stw r0,_TRAP(r1) + bl do_break + b ret_from_except_full + /* * This routine switches between two different tasks. The process * state of one is saved on its kernel stack. Then the state diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c index f04bc9f6b134..f257965b54b5 100644 --- a/arch/powerpc/mm/fault.c +++ b/arch/powerpc/mm/fault.c @@ -242,15 +242,6 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address, goto bail; } -#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE) || \ - defined(CONFIG_PPC_BOOK3S_64) || defined(CONFIG_PPC_8xx)) - if (error_code & DSISR_DABRMATCH) { - /* breakpoint match */ - do_break(regs, address, error_code); - goto bail; - } -#endif - /* We restore the interrupt state now */ if (!arch_irq_disabled_regs(regs)) local_irq_enable(); -- 2.13.3