From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 153FDC43463 for ; Fri, 18 Sep 2020 10:32:57 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B0BE620C56 for ; Fri, 18 Sep 2020 10:32:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="k6qp96C3"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="P/kFXeue" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B0BE620C56 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:References:In-Reply-To:Message-Id:Date:Subject:To: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=PP5/Z5EHwAQAHaQVov2sdJyW4FErwbiQWL65uaaum9w=; b=k6qp96C3rXG5Jxz+FsOwZ3zRel +kQpNRYwWWQafqBB8dyUrEFyto+5zOornG5LEAgstXItR/MP+dSCVTOX0gtY6BnVVKINPLK0IFQX1 7Jp9vPrGh+ZGmtLfeEGYevyUMqzXcuUFxp9MytMyqbhBV2LFltIpFf2Den44atnGOPNJbqSXx/bfa ouDTmwu/gG+V6Kze5JrDAbscYM1cJw1BwMoxA7Roo/STJkHu3jvadiOboee5CLIUPfMYJu7ZEH7wb r+FWaNrQdgVYbmYNiBMKuNTZrDdgKmylAEdXdr+yKt28LNEBcelUCqyO73XE5saiJdsTtqA2qXI+c vqVVZYQw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kJDg5-0000vV-3u; Fri, 18 Sep 2020 10:31:41 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kJDfm-0000qV-MS for linux-arm-kernel@lists.infradead.org; Fri, 18 Sep 2020 10:31:23 +0000 Received: from e123331-lin.nice.arm.com (adsl-119.109.242.22.tellas.gr [109.242.22.119]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A1EF021D92; Fri, 18 Sep 2020 10:31:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600425081; bh=IyE2vpWRuZWSnn1Z02drazCDd+O3utm6FRND0TFfK6I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P/kFXeueOEzZb4M7fszmLbpVIewUPJ9Doo5NOrpEz4EbPkJGDNBIJSVNs2ihGpLk5 y0jAuffW04Z5JQF75bLPNNo/kAFbgWBsnF9qjeNlvFXDxX5+8O1S53RfoyJ/w+OOkD TRT8FFuEh05mHrN2JQBTMruEdFIjf+OHA/SZwTb4= From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org Subject: [RFC/RFT PATCH 4/6] ARM: p2v: use relative references in patch site arrays Date: Fri, 18 Sep 2020 13:31:00 +0300 Message-Id: <20200918103102.18107-5-ardb@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200918103102.18107-1-ardb@kernel.org> References: <20200918103102.18107-1-ardb@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200918_063122_904415_048E783C X-CRM114-Status: GOOD ( 11.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-efi@vger.kernel.org, Nicolas Pitre , Linus Walleij , Russell King , Santosh Shilimkar , Zhen Lei , Ard Biesheuvel MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Free up a register in the p2v patching code by switching to relative references, which don't require keeping the phys-to-virt displacement live in a register. Signed-off-by: Ard Biesheuvel --- arch/arm/include/asm/memory.h | 6 +++--- arch/arm/kernel/head.S | 15 ++++++++------- 2 files changed, 11 insertions(+), 10 deletions(-) diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h index eb3c8e6e960a..4121662dea5a 100644 --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -187,7 +187,7 @@ extern const void *__pv_table_begin, *__pv_table_end; __asm__("@ __pv_stub\n" \ "1: " instr " %0, %1, %2\n" \ " .pushsection .pv_table,\"a\"\n" \ - " .long 1b\n" \ + " .long 1b - .\n" \ " .popsection\n" \ : "=r" (to) \ : "r" (from), "I" (__PV_BITS_31_24)) @@ -196,7 +196,7 @@ extern const void *__pv_table_begin, *__pv_table_end; __asm__ volatile("@ __pv_stub_mov\n" \ "1: mov %R0, %1\n" \ " .pushsection .pv_table,\"a\"\n" \ - " .long 1b\n" \ + " .long 1b - .\n" \ " .popsection\n" \ : "=r" (t) \ : "I" (__PV_BITS_7_0)) @@ -206,7 +206,7 @@ extern const void *__pv_table_begin, *__pv_table_end; "1: adds %Q0, %1, %2\n" \ " adc %R0, %R0, #0\n" \ " .pushsection .pv_table,\"a\"\n" \ - " .long 1b\n" \ + " .long 1b - .\n" \ " .popsection\n" \ : "+r" (y) \ : "r" (x), "I" (__PV_BITS_31_24) \ diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index c2a912121e3e..d2bd3b258386 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -633,7 +633,7 @@ ENDPROC(__fixup_pv_table) __fixup_a_pv_table: adr r0, 3f ldr r6, [r0] - add r6, r6, r3 + add r6, r6, r0 ldr r0, [r6, #HIGH_OFFSET] @ pv_offset high word ldr r6, [r6, #LOW_OFFSET] @ pv_offset low word mov r6, r6, lsr #24 @@ -651,7 +651,8 @@ __fixup_a_pv_table: orr r6, r6, r7, lsl #12 orr r6, #0x4000 b .Lnext -.Lloop: add r7, r3 +.Lloop: add r7, r4 + add r4, #4 ldrh ip, [r7, #2] ARM_BE8(rev16 ip, ip) tst ip, #0x4000 @@ -681,28 +682,28 @@ ARM_BE8(rev16 ip, ip) moveq r0, #PV_BIT22 @ set bit 22, mov to mvn instruction b .Lnext -.Lloop: ldr ip, [r7, r3] +.Lloop: ldr ip, [r7, r4] bic ip, ip, #PV_IMM8_MASK tst ip, #PV_ROT_MASK @ check the rotation field orrne ip, ip, r6 ARM_BE8(, lsl #24) @ mask in offset bits 31-24 biceq ip, ip, #PV_BIT22 @ clear bit 22 orreq ip, ip, r0 @ mask in offset bits 7-0 - str ip, [r7, r3] + str ip, [r7, r4] + add r4, r4, #4 #endif .Lnext: cmp r4, r5 - ldrcc r7, [r4], #4 @ use branch for delay slot + ldrcc r7, [r4] @ use branch for delay slot bcc .Lloop ret lr ENDPROC(__fixup_a_pv_table) .align -3: .long __pv_offset +3: .long __pv_offset - . ENTRY(fixup_pv_table) stmfd sp!, {r4 - r7, lr} - mov r3, #0 @ no offset mov r4, r0 @ r0 = table start add r5, r0, r1 @ r1 = table size bl __fixup_a_pv_table -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel