From patchwork Mon Jan 12 03:59:38 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Pitre X-Patchwork-Id: 5607741 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 8C3A4C058D for ; Mon, 12 Jan 2015 04:02:29 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EB13C20640 for ; Mon, 12 Jan 2015 04:02:27 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0BBDC2063F for ; Mon, 12 Jan 2015 04:02:26 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YAWAs-0007EB-P7; Mon, 12 Jan 2015 04:00:18 +0000 Received: from relais.videotron.ca ([24.201.245.36]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YAWAn-0005wO-8N for linux-arm-kernel@lists.infradead.org; Mon, 12 Jan 2015 04:00:16 +0000 MIME-version: 1.0 Received: from yoda.home ([66.131.180.142]) by VL-VM-MR006.ip.videotron.ca (Oracle Communications Messaging Exchange Server 7u4-22.01 64bit (built Apr 21 2011)) with ESMTP id <0NI100G8VPRHLR60@VL-VM-MR006.ip.videotron.ca> for linux-arm-kernel@lists.infradead.org; Sun, 11 Jan 2015 22:59:41 -0500 (EST) Received: from xanadu.home (xanadu.home [192.168.2.2]) by yoda.home (Postfix) with ESMTPSA id D9AE42DA0554; Sun, 11 Jan 2015 22:59:40 -0500 (EST) Date: Sun, 11 Jan 2015 22:59:38 -0500 (EST) From: Nicolas Pitre To: Russell King Subject: [PATCH] ARM: remove ARMv3 user access code again Message-id: User-Agent: Alpine 2.11 (LFD 23 2013-08-11) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150111_200013_646272_1B89867F X-CRM114-Status: GOOD ( 14.23 ) X-Spam-Score: -0.0 (/) Cc: linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This code was restored with commit 080fc66fb5 ("ARM: Bring back ARMv3 IO and user access code") because the RiscPC memory bus does not understand half-word load/stores. However only the IO code needed restoring since the alternative user access code contains no half-word accesses, is already used when CONFIG_PREEMPT is set and it runs faster on a StrongARM. Signed-off-by: Nicolas Pitre diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile index 0573faab96..d8a7807995 100644 --- a/arch/arm/lib/Makefile +++ b/arch/arm/lib/Makefile @@ -15,19 +15,8 @@ lib-y := backtrace.o changebit.o csumipv6.o csumpartial.o \ io-readsb.o io-writesb.o io-readsl.o io-writesl.o \ call_with_stack.o bswapsdi2.o -mmu-y := clear_user.o copy_page.o getuser.o putuser.o - -# the code in uaccess.S is not preemption safe and -# probably faster on ARMv3 only -ifeq ($(CONFIG_PREEMPT),y) - mmu-y += copy_from_user.o copy_to_user.o -else -ifneq ($(CONFIG_CPU_32v3),y) - mmu-y += copy_from_user.o copy_to_user.o -else - mmu-y += uaccess.o -endif -endif +mmu-y := clear_user.o copy_page.o getuser.o putuser.o \ + copy_from_user.o copy_to_user.o # using lib_ here won't override already available weak symbols obj-$(CONFIG_UACCESS_WITH_MEMCPY) += uaccess_with_memcpy.o diff --git a/arch/arm/lib/uaccess.S b/arch/arm/lib/uaccess.S deleted file mode 100644 index e50520904b..0000000000 --- a/arch/arm/lib/uaccess.S +++ /dev/null @@ -1,564 +0,0 @@ -/* - * linux/arch/arm/lib/uaccess.S - * - * Copyright (C) 1995, 1996,1997,1998 Russell King - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * Routines to block copy data to/from user memory - * These are highly optimised both for the 4k page size - * and for various alignments. - */ -#include -#include -#include -#include - - .text - -#define PAGE_SHIFT 12 - -/* Prototype: int __copy_to_user(void *to, const char *from, size_t n) - * Purpose : copy a block to user memory from kernel memory - * Params : to - user memory - * : from - kernel memory - * : n - number of bytes to copy - * Returns : Number of bytes NOT copied. - */ - -.Lc2u_dest_not_aligned: - rsb ip, ip, #4 - cmp ip, #2 - ldrb r3, [r1], #1 -USER( TUSER( strb) r3, [r0], #1) @ May fault - ldrgeb r3, [r1], #1 -USER( TUSER( strgeb) r3, [r0], #1) @ May fault - ldrgtb r3, [r1], #1 -USER( TUSER( strgtb) r3, [r0], #1) @ May fault - sub r2, r2, ip - b .Lc2u_dest_aligned - -ENTRY(__copy_to_user) - stmfd sp!, {r2, r4 - r7, lr} - cmp r2, #4 - blt .Lc2u_not_enough - ands ip, r0, #3 - bne .Lc2u_dest_not_aligned -.Lc2u_dest_aligned: - - ands ip, r1, #3 - bne .Lc2u_src_not_aligned -/* - * Seeing as there has to be at least 8 bytes to copy, we can - * copy one word, and force a user-mode page fault... - */ - -.Lc2u_0fupi: subs r2, r2, #4 - addmi ip, r2, #4 - bmi .Lc2u_0nowords - ldr r3, [r1], #4 -USER( TUSER( str) r3, [r0], #4) @ May fault - mov ip, r0, lsl #32 - PAGE_SHIFT @ On each page, use a ld/st??t instruction - rsb ip, ip, #0 - movs ip, ip, lsr #32 - PAGE_SHIFT - beq .Lc2u_0fupi -/* - * ip = max no. of bytes to copy before needing another "strt" insn - */ - cmp r2, ip - movlt ip, r2 - sub r2, r2, ip - subs ip, ip, #32 - blt .Lc2u_0rem8lp - -.Lc2u_0cpy8lp: ldmia r1!, {r3 - r6} - stmia r0!, {r3 - r6} @ Shouldnt fault - ldmia r1!, {r3 - r6} - subs ip, ip, #32 - stmia r0!, {r3 - r6} @ Shouldnt fault - bpl .Lc2u_0cpy8lp - -.Lc2u_0rem8lp: cmn ip, #16 - ldmgeia r1!, {r3 - r6} - stmgeia r0!, {r3 - r6} @ Shouldnt fault - tst ip, #8 - ldmneia r1!, {r3 - r4} - stmneia r0!, {r3 - r4} @ Shouldnt fault - tst ip, #4 - ldrne r3, [r1], #4 - TUSER( strne) r3, [r0], #4 @ Shouldnt fault - ands ip, ip, #3 - beq .Lc2u_0fupi -.Lc2u_0nowords: teq ip, #0 - beq .Lc2u_finished -.Lc2u_nowords: cmp ip, #2 - ldrb r3, [r1], #1 -USER( TUSER( strb) r3, [r0], #1) @ May fault - ldrgeb r3, [r1], #1 -USER( TUSER( strgeb) r3, [r0], #1) @ May fault - ldrgtb r3, [r1], #1 -USER( TUSER( strgtb) r3, [r0], #1) @ May fault - b .Lc2u_finished - -.Lc2u_not_enough: - movs ip, r2 - bne .Lc2u_nowords -.Lc2u_finished: mov r0, #0 - ldmfd sp!, {r2, r4 - r7, pc} - -.Lc2u_src_not_aligned: - bic r1, r1, #3 - ldr r7, [r1], #4 - cmp ip, #2 - bgt .Lc2u_3fupi - beq .Lc2u_2fupi -.Lc2u_1fupi: subs r2, r2, #4 - addmi ip, r2, #4 - bmi .Lc2u_1nowords - mov r3, r7, lspull #8 - ldr r7, [r1], #4 - orr r3, r3, r7, lspush #24 -USER( TUSER( str) r3, [r0], #4) @ May fault - mov ip, r0, lsl #32 - PAGE_SHIFT - rsb ip, ip, #0 - movs ip, ip, lsr #32 - PAGE_SHIFT - beq .Lc2u_1fupi - cmp r2, ip - movlt ip, r2 - sub r2, r2, ip - subs ip, ip, #16 - blt .Lc2u_1rem8lp - -.Lc2u_1cpy8lp: mov r3, r7, lspull #8 - ldmia r1!, {r4 - r7} - subs ip, ip, #16 - orr r3, r3, r4, lspush #24 - mov r4, r4, lspull #8 - orr r4, r4, r5, lspush #24 - mov r5, r5, lspull #8 - orr r5, r5, r6, lspush #24 - mov r6, r6, lspull #8 - orr r6, r6, r7, lspush #24 - stmia r0!, {r3 - r6} @ Shouldnt fault - bpl .Lc2u_1cpy8lp - -.Lc2u_1rem8lp: tst ip, #8 - movne r3, r7, lspull #8 - ldmneia r1!, {r4, r7} - orrne r3, r3, r4, lspush #24 - movne r4, r4, lspull #8 - orrne r4, r4, r7, lspush #24 - stmneia r0!, {r3 - r4} @ Shouldnt fault - tst ip, #4 - movne r3, r7, lspull #8 - ldrne r7, [r1], #4 - orrne r3, r3, r7, lspush #24 - TUSER( strne) r3, [r0], #4 @ Shouldnt fault - ands ip, ip, #3 - beq .Lc2u_1fupi -.Lc2u_1nowords: mov r3, r7, get_byte_1 - teq ip, #0 - beq .Lc2u_finished - cmp ip, #2 -USER( TUSER( strb) r3, [r0], #1) @ May fault - movge r3, r7, get_byte_2 -USER( TUSER( strgeb) r3, [r0], #1) @ May fault - movgt r3, r7, get_byte_3 -USER( TUSER( strgtb) r3, [r0], #1) @ May fault - b .Lc2u_finished - -.Lc2u_2fupi: subs r2, r2, #4 - addmi ip, r2, #4 - bmi .Lc2u_2nowords - mov r3, r7, lspull #16 - ldr r7, [r1], #4 - orr r3, r3, r7, lspush #16 -USER( TUSER( str) r3, [r0], #4) @ May fault - mov ip, r0, lsl #32 - PAGE_SHIFT - rsb ip, ip, #0 - movs ip, ip, lsr #32 - PAGE_SHIFT - beq .Lc2u_2fupi - cmp r2, ip - movlt ip, r2 - sub r2, r2, ip - subs ip, ip, #16 - blt .Lc2u_2rem8lp - -.Lc2u_2cpy8lp: mov r3, r7, lspull #16 - ldmia r1!, {r4 - r7} - subs ip, ip, #16 - orr r3, r3, r4, lspush #16 - mov r4, r4, lspull #16 - orr r4, r4, r5, lspush #16 - mov r5, r5, lspull #16 - orr r5, r5, r6, lspush #16 - mov r6, r6, lspull #16 - orr r6, r6, r7, lspush #16 - stmia r0!, {r3 - r6} @ Shouldnt fault - bpl .Lc2u_2cpy8lp - -.Lc2u_2rem8lp: tst ip, #8 - movne r3, r7, lspull #16 - ldmneia r1!, {r4, r7} - orrne r3, r3, r4, lspush #16 - movne r4, r4, lspull #16 - orrne r4, r4, r7, lspush #16 - stmneia r0!, {r3 - r4} @ Shouldnt fault - tst ip, #4 - movne r3, r7, lspull #16 - ldrne r7, [r1], #4 - orrne r3, r3, r7, lspush #16 - TUSER( strne) r3, [r0], #4 @ Shouldnt fault - ands ip, ip, #3 - beq .Lc2u_2fupi -.Lc2u_2nowords: mov r3, r7, get_byte_2 - teq ip, #0 - beq .Lc2u_finished - cmp ip, #2 -USER( TUSER( strb) r3, [r0], #1) @ May fault - movge r3, r7, get_byte_3 -USER( TUSER( strgeb) r3, [r0], #1) @ May fault - ldrgtb r3, [r1], #0 -USER( TUSER( strgtb) r3, [r0], #1) @ May fault - b .Lc2u_finished - -.Lc2u_3fupi: subs r2, r2, #4 - addmi ip, r2, #4 - bmi .Lc2u_3nowords - mov r3, r7, lspull #24 - ldr r7, [r1], #4 - orr r3, r3, r7, lspush #8 -USER( TUSER( str) r3, [r0], #4) @ May fault - mov ip, r0, lsl #32 - PAGE_SHIFT - rsb ip, ip, #0 - movs ip, ip, lsr #32 - PAGE_SHIFT - beq .Lc2u_3fupi - cmp r2, ip - movlt ip, r2 - sub r2, r2, ip - subs ip, ip, #16 - blt .Lc2u_3rem8lp - -.Lc2u_3cpy8lp: mov r3, r7, lspull #24 - ldmia r1!, {r4 - r7} - subs ip, ip, #16 - orr r3, r3, r4, lspush #8 - mov r4, r4, lspull #24 - orr r4, r4, r5, lspush #8 - mov r5, r5, lspull #24 - orr r5, r5, r6, lspush #8 - mov r6, r6, lspull #24 - orr r6, r6, r7, lspush #8 - stmia r0!, {r3 - r6} @ Shouldnt fault - bpl .Lc2u_3cpy8lp - -.Lc2u_3rem8lp: tst ip, #8 - movne r3, r7, lspull #24 - ldmneia r1!, {r4, r7} - orrne r3, r3, r4, lspush #8 - movne r4, r4, lspull #24 - orrne r4, r4, r7, lspush #8 - stmneia r0!, {r3 - r4} @ Shouldnt fault - tst ip, #4 - movne r3, r7, lspull #24 - ldrne r7, [r1], #4 - orrne r3, r3, r7, lspush #8 - TUSER( strne) r3, [r0], #4 @ Shouldnt fault - ands ip, ip, #3 - beq .Lc2u_3fupi -.Lc2u_3nowords: mov r3, r7, get_byte_3 - teq ip, #0 - beq .Lc2u_finished - cmp ip, #2 -USER( TUSER( strb) r3, [r0], #1) @ May fault - ldrgeb r3, [r1], #1 -USER( TUSER( strgeb) r3, [r0], #1) @ May fault - ldrgtb r3, [r1], #0 -USER( TUSER( strgtb) r3, [r0], #1) @ May fault - b .Lc2u_finished -ENDPROC(__copy_to_user) - - .pushsection .fixup,"ax" - .align 0 -9001: ldmfd sp!, {r0, r4 - r7, pc} - .popsection - -/* Prototype: unsigned long __copy_from_user(void *to,const void *from,unsigned long n); - * Purpose : copy a block from user memory to kernel memory - * Params : to - kernel memory - * : from - user memory - * : n - number of bytes to copy - * Returns : Number of bytes NOT copied. - */ -.Lcfu_dest_not_aligned: - rsb ip, ip, #4 - cmp ip, #2 -USER( TUSER( ldrb) r3, [r1], #1) @ May fault - strb r3, [r0], #1 -USER( TUSER( ldrgeb) r3, [r1], #1) @ May fault - strgeb r3, [r0], #1 -USER( TUSER( ldrgtb) r3, [r1], #1) @ May fault - strgtb r3, [r0], #1 - sub r2, r2, ip - b .Lcfu_dest_aligned - -ENTRY(__copy_from_user) - stmfd sp!, {r0, r2, r4 - r7, lr} - cmp r2, #4 - blt .Lcfu_not_enough - ands ip, r0, #3 - bne .Lcfu_dest_not_aligned -.Lcfu_dest_aligned: - ands ip, r1, #3 - bne .Lcfu_src_not_aligned - -/* - * Seeing as there has to be at least 8 bytes to copy, we can - * copy one word, and force a user-mode page fault... - */ - -.Lcfu_0fupi: subs r2, r2, #4 - addmi ip, r2, #4 - bmi .Lcfu_0nowords -USER( TUSER( ldr) r3, [r1], #4) - str r3, [r0], #4 - mov ip, r1, lsl #32 - PAGE_SHIFT @ On each page, use a ld/st??t instruction - rsb ip, ip, #0 - movs ip, ip, lsr #32 - PAGE_SHIFT - beq .Lcfu_0fupi -/* - * ip = max no. of bytes to copy before needing another "strt" insn - */ - cmp r2, ip - movlt ip, r2 - sub r2, r2, ip - subs ip, ip, #32 - blt .Lcfu_0rem8lp - -.Lcfu_0cpy8lp: ldmia r1!, {r3 - r6} @ Shouldnt fault - stmia r0!, {r3 - r6} - ldmia r1!, {r3 - r6} @ Shouldnt fault - subs ip, ip, #32 - stmia r0!, {r3 - r6} - bpl .Lcfu_0cpy8lp - -.Lcfu_0rem8lp: cmn ip, #16 - ldmgeia r1!, {r3 - r6} @ Shouldnt fault - stmgeia r0!, {r3 - r6} - tst ip, #8 - ldmneia r1!, {r3 - r4} @ Shouldnt fault - stmneia r0!, {r3 - r4} - tst ip, #4 - TUSER( ldrne) r3, [r1], #4 @ Shouldnt fault - strne r3, [r0], #4 - ands ip, ip, #3 - beq .Lcfu_0fupi -.Lcfu_0nowords: teq ip, #0 - beq .Lcfu_finished -.Lcfu_nowords: cmp ip, #2 -USER( TUSER( ldrb) r3, [r1], #1) @ May fault - strb r3, [r0], #1 -USER( TUSER( ldrgeb) r3, [r1], #1) @ May fault - strgeb r3, [r0], #1 -USER( TUSER( ldrgtb) r3, [r1], #1) @ May fault - strgtb r3, [r0], #1 - b .Lcfu_finished - -.Lcfu_not_enough: - movs ip, r2 - bne .Lcfu_nowords -.Lcfu_finished: mov r0, #0 - add sp, sp, #8 - ldmfd sp!, {r4 - r7, pc} - -.Lcfu_src_not_aligned: - bic r1, r1, #3 -USER( TUSER( ldr) r7, [r1], #4) @ May fault - cmp ip, #2 - bgt .Lcfu_3fupi - beq .Lcfu_2fupi -.Lcfu_1fupi: subs r2, r2, #4 - addmi ip, r2, #4 - bmi .Lcfu_1nowords - mov r3, r7, lspull #8 -USER( TUSER( ldr) r7, [r1], #4) @ May fault - orr r3, r3, r7, lspush #24 - str r3, [r0], #4 - mov ip, r1, lsl #32 - PAGE_SHIFT - rsb ip, ip, #0 - movs ip, ip, lsr #32 - PAGE_SHIFT - beq .Lcfu_1fupi - cmp r2, ip - movlt ip, r2 - sub r2, r2, ip - subs ip, ip, #16 - blt .Lcfu_1rem8lp - -.Lcfu_1cpy8lp: mov r3, r7, lspull #8 - ldmia r1!, {r4 - r7} @ Shouldnt fault - subs ip, ip, #16 - orr r3, r3, r4, lspush #24 - mov r4, r4, lspull #8 - orr r4, r4, r5, lspush #24 - mov r5, r5, lspull #8 - orr r5, r5, r6, lspush #24 - mov r6, r6, lspull #8 - orr r6, r6, r7, lspush #24 - stmia r0!, {r3 - r6} - bpl .Lcfu_1cpy8lp - -.Lcfu_1rem8lp: tst ip, #8 - movne r3, r7, lspull #8 - ldmneia r1!, {r4, r7} @ Shouldnt fault - orrne r3, r3, r4, lspush #24 - movne r4, r4, lspull #8 - orrne r4, r4, r7, lspush #24 - stmneia r0!, {r3 - r4} - tst ip, #4 - movne r3, r7, lspull #8 -USER( TUSER( ldrne) r7, [r1], #4) @ May fault - orrne r3, r3, r7, lspush #24 - strne r3, [r0], #4 - ands ip, ip, #3 - beq .Lcfu_1fupi -.Lcfu_1nowords: mov r3, r7, get_byte_1 - teq ip, #0 - beq .Lcfu_finished - cmp ip, #2 - strb r3, [r0], #1 - movge r3, r7, get_byte_2 - strgeb r3, [r0], #1 - movgt r3, r7, get_byte_3 - strgtb r3, [r0], #1 - b .Lcfu_finished - -.Lcfu_2fupi: subs r2, r2, #4 - addmi ip, r2, #4 - bmi .Lcfu_2nowords - mov r3, r7, lspull #16 -USER( TUSER( ldr) r7, [r1], #4) @ May fault - orr r3, r3, r7, lspush #16 - str r3, [r0], #4 - mov ip, r1, lsl #32 - PAGE_SHIFT - rsb ip, ip, #0 - movs ip, ip, lsr #32 - PAGE_SHIFT - beq .Lcfu_2fupi - cmp r2, ip - movlt ip, r2 - sub r2, r2, ip - subs ip, ip, #16 - blt .Lcfu_2rem8lp - - -.Lcfu_2cpy8lp: mov r3, r7, lspull #16 - ldmia r1!, {r4 - r7} @ Shouldnt fault - subs ip, ip, #16 - orr r3, r3, r4, lspush #16 - mov r4, r4, lspull #16 - orr r4, r4, r5, lspush #16 - mov r5, r5, lspull #16 - orr r5, r5, r6, lspush #16 - mov r6, r6, lspull #16 - orr r6, r6, r7, lspush #16 - stmia r0!, {r3 - r6} - bpl .Lcfu_2cpy8lp - -.Lcfu_2rem8lp: tst ip, #8 - movne r3, r7, lspull #16 - ldmneia r1!, {r4, r7} @ Shouldnt fault - orrne r3, r3, r4, lspush #16 - movne r4, r4, lspull #16 - orrne r4, r4, r7, lspush #16 - stmneia r0!, {r3 - r4} - tst ip, #4 - movne r3, r7, lspull #16 -USER( TUSER( ldrne) r7, [r1], #4) @ May fault - orrne r3, r3, r7, lspush #16 - strne r3, [r0], #4 - ands ip, ip, #3 - beq .Lcfu_2fupi -.Lcfu_2nowords: mov r3, r7, get_byte_2 - teq ip, #0 - beq .Lcfu_finished - cmp ip, #2 - strb r3, [r0], #1 - movge r3, r7, get_byte_3 - strgeb r3, [r0], #1 -USER( TUSER( ldrgtb) r3, [r1], #0) @ May fault - strgtb r3, [r0], #1 - b .Lcfu_finished - -.Lcfu_3fupi: subs r2, r2, #4 - addmi ip, r2, #4 - bmi .Lcfu_3nowords - mov r3, r7, lspull #24 -USER( TUSER( ldr) r7, [r1], #4) @ May fault - orr r3, r3, r7, lspush #8 - str r3, [r0], #4 - mov ip, r1, lsl #32 - PAGE_SHIFT - rsb ip, ip, #0 - movs ip, ip, lsr #32 - PAGE_SHIFT - beq .Lcfu_3fupi - cmp r2, ip - movlt ip, r2 - sub r2, r2, ip - subs ip, ip, #16 - blt .Lcfu_3rem8lp - -.Lcfu_3cpy8lp: mov r3, r7, lspull #24 - ldmia r1!, {r4 - r7} @ Shouldnt fault - orr r3, r3, r4, lspush #8 - mov r4, r4, lspull #24 - orr r4, r4, r5, lspush #8 - mov r5, r5, lspull #24 - orr r5, r5, r6, lspush #8 - mov r6, r6, lspull #24 - orr r6, r6, r7, lspush #8 - stmia r0!, {r3 - r6} - subs ip, ip, #16 - bpl .Lcfu_3cpy8lp - -.Lcfu_3rem8lp: tst ip, #8 - movne r3, r7, lspull #24 - ldmneia r1!, {r4, r7} @ Shouldnt fault - orrne r3, r3, r4, lspush #8 - movne r4, r4, lspull #24 - orrne r4, r4, r7, lspush #8 - stmneia r0!, {r3 - r4} - tst ip, #4 - movne r3, r7, lspull #24 -USER( TUSER( ldrne) r7, [r1], #4) @ May fault - orrne r3, r3, r7, lspush #8 - strne r3, [r0], #4 - ands ip, ip, #3 - beq .Lcfu_3fupi -.Lcfu_3nowords: mov r3, r7, get_byte_3 - teq ip, #0 - beq .Lcfu_finished - cmp ip, #2 - strb r3, [r0], #1 -USER( TUSER( ldrgeb) r3, [r1], #1) @ May fault - strgeb r3, [r0], #1 -USER( TUSER( ldrgtb) r3, [r1], #1) @ May fault - strgtb r3, [r0], #1 - b .Lcfu_finished -ENDPROC(__copy_from_user) - - .pushsection .fixup,"ax" - .align 0 - /* - * We took an exception. r0 contains a pointer to - * the byte not copied. - */ -9001: ldr r2, [sp], #4 @ void *to - sub r2, r0, r2 @ bytes copied - ldr r1, [sp], #4 @ unsigned long count - subs r4, r1, r2 @ bytes left to copy - movne r1, r4 - blne __memzero - mov r0, r4 - ldmfd sp!, {r4 - r7, pc} - .popsection -