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[209.132.180.67]) by mx.google.com with ESMTP id d187si6349847oif.33.2019.12.21.00.34.24; Sat, 21 Dec 2019 00:34:35 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@c-s.fr header.s=mail header.b=kkuxk88F; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726783AbfLUIcd (ORCPT + 99 others); Sat, 21 Dec 2019 03:32:33 -0500 Received: from pegase1.c-s.fr ([93.17.236.30]:5083 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726521AbfLUIc3 (ORCPT ); Sat, 21 Dec 2019 03:32:29 -0500 Received: from localhost (mailhub1-ext [192.168.12.233]) by localhost (Postfix) with ESMTP id 47fzPk0zwKz9vBmt; Sat, 21 Dec 2019 09:32:26 +0100 (CET) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=kkuxk88F; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id V1aKPqdfVmtk; Sat, 21 Dec 2019 09:32:26 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 47fzPj6xZBz9v1Ks; Sat, 21 Dec 2019 09:32:25 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1576917146; bh=8ftmeyPqqlcOQZKXXYr2+SgDzTYbbqznzk6320BOCv8=; h=In-Reply-To:References:From:Subject:To:Cc:Date:From; b=kkuxk88FC/AAKIFHLP7ko54ZWEPhxm2zMN6Q20rQS7gFc8k/EzvsBrL74QdTBD8hy g2NsF0pWlVHboeFa744rikfAg3Um/rt5VF5BdkMXEAWnACeLXljD2l/pBlGQ1m76Hx 6q/tfEPPpEUXaI8XWmyWUftW81OQn5RPeGivpZFo= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id EF6E88B77C; Sat, 21 Dec 2019 09:32:26 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id JR21AhPaIQ_j; Sat, 21 Dec 2019 09:32:26 +0100 (CET) Received: from localhost.localdomain (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id B59488B752; Sat, 21 Dec 2019 09:32:26 +0100 (CET) Received: by localhost.localdomain (Postfix, from userid 0) id 7C125637B6; Sat, 21 Dec 2019 08:32:26 +0000 (UTC) Message-Id: <1286b3e51b07727c6b4b05f2df9af3f9b1717fb5.1576916812.git.christophe.leroy@c-s.fr> In-Reply-To: References: From: Christophe Leroy Subject: [PATCH v5 05/17] powerpc/32: add a macro to get and/or save DAR and DSISR on stack. To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , dja@axtens.net Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org Date: Sat, 21 Dec 2019 08:32:26 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Refactor reading and saving of DAR and DSISR in exception vectors. This will ease the implementation of VMAP stack. Signed-off-by: Christophe Leroy --- arch/powerpc/kernel/head_32.S | 5 +---- arch/powerpc/kernel/head_32.h | 11 +++++++++++ arch/powerpc/kernel/head_8xx.S | 23 +++++++---------------- 3 files changed, 19 insertions(+), 20 deletions(-) diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S index bebb49d877f2..449625b4ff03 100644 --- a/arch/powerpc/kernel/head_32.S +++ b/arch/powerpc/kernel/head_32.S @@ -339,10 +339,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) DO_KVM 0x600 Alignment: EXCEPTION_PROLOG - mfspr r4,SPRN_DAR - stw r4,_DAR(r11) - mfspr r5,SPRN_DSISR - stw r5,_DSISR(r11) + save_dar_dsisr_on_stack r4, r5, r11 addi r3,r1,STACK_FRAME_OVERHEAD EXC_XFER_STD(0x600, alignment_exception) diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h index 436ffd862d2a..f19a1ab91fb5 100644 --- a/arch/powerpc/kernel/head_32.h +++ b/arch/powerpc/kernel/head_32.h @@ -144,6 +144,17 @@ RFI /* jump to handler, enable MMU */ .endm +.macro save_dar_dsisr_on_stack reg1, reg2, sp + mfspr \reg1, SPRN_DAR + mfspr \reg2, SPRN_DSISR + stw \reg1, _DAR(\sp) + stw \reg2, _DSISR(\sp) +.endm + +.macro get_and_save_dar_dsisr_on_stack reg1, reg2, sp + save_dar_dsisr_on_stack \reg1, \reg2, \sp +.endm + /* * Note: code which follows this uses cr0.eq (set if from kernel), * r11, r12 (SRR0), and r9 (SRR1). diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 175c3cfc8014..25e19af49705 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -128,12 +128,9 @@ instruction_counter: . = 0x200 MachineCheck: EXCEPTION_PROLOG - mfspr r4,SPRN_DAR - stw r4,_DAR(r11) - li r5,RPN_PATTERN - mtspr SPRN_DAR,r5 /* Tag DAR, to be used in DTLB Error */ - mfspr r5,SPRN_DSISR - stw r5,_DSISR(r11) + save_dar_dsisr_on_stack r4, r5, r11 + li r6, RPN_PATTERN + mtspr SPRN_DAR, r6 /* Tag DAR, to be used in DTLB Error */ addi r3,r1,STACK_FRAME_OVERHEAD EXC_XFER_STD(0x200, machine_check_exception) @@ -156,12 +153,9 @@ InstructionAccess: . = 0x600 Alignment: EXCEPTION_PROLOG - mfspr r4,SPRN_DAR - stw r4,_DAR(r11) - li r5,RPN_PATTERN - mtspr SPRN_DAR,r5 /* Tag DAR, to be used in DTLB Error */ - mfspr r5,SPRN_DSISR - stw r5,_DSISR(r11) + save_dar_dsisr_on_stack r4, r5, r11 + li r6, RPN_PATTERN + mtspr SPRN_DAR, r6 /* Tag DAR, to be used in DTLB Error */ addi r3,r1,STACK_FRAME_OVERHEAD EXC_XFER_STD(0x600, alignment_exception) @@ -502,10 +496,7 @@ DataTLBError: DARFixed:/* Return from dcbx instruction bug workaround */ EXCEPTION_PROLOG_1 EXCEPTION_PROLOG_2 - mfspr r5,SPRN_DSISR - stw r5,_DSISR(r11) - mfspr r4,SPRN_DAR - stw r4, _DAR(r11) + get_and_save_dar_dsisr_on_stack r4, r5, r11 andis. r10,r5,DSISR_NOHPTE@h beq+ .Ldtlbie tlbie r4 -- 2.13.3