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authorRussell King <rmk+kernel@arm.linux.org.uk>2012-08-13 11:44:13 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-08-13 11:44:13 +0100
commit080fc66fb5b6feae19fbbe8c6cbd7b11a4dac636 (patch)
treec275a107edc536ca22b5a7ac689a1fb0122efd0b /arch/arm/lib
parent730a8128cd8978467eb1cf546b11014acb57d433 (diff)
downloadlinux-linaro-stable-080fc66fb5b6feae19fbbe8c6cbd7b11a4dac636.tar.gz
ARM: Bring back ARMv3 IO and user access code
This partially reverts 357c9c1f07d4546bc3fbc0fd1044d96b114d14ed (ARM: Remove support for ARMv3 ARM610 and ARM710 CPUs). Although we only support StrongARM on the RiscPC, we need to keep the ARMv3 user access code for this platform because the bus does not understand half-word load/stores. Reported-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/lib')
-rw-r--r--arch/arm/lib/Makefile23
-rw-r--r--arch/arm/lib/io-readsw-armv3.S106
-rw-r--r--arch/arm/lib/io-writesw-armv3.S126
-rw-r--r--arch/arm/lib/uaccess.S564
4 files changed, 816 insertions, 3 deletions
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 2473fd1fd51c..af72969820b4 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -16,13 +16,30 @@ lib-y := backtrace.o changebit.o csumipv6.o csumpartial.o \
call_with_stack.o
mmu-y := clear_user.o copy_page.o getuser.o putuser.o
-mmu-y += copy_from_user.o copy_to_user.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
# using lib_ here won't override already available weak symbols
obj-$(CONFIG_UACCESS_WITH_MEMCPY) += uaccess_with_memcpy.o
-lib-$(CONFIG_MMU) += $(mmu-y)
-lib-y += io-readsw-armv4.o io-writesw-armv4.o
+lib-$(CONFIG_MMU) += $(mmu-y)
+
+ifeq ($(CONFIG_CPU_32v3),y)
+ lib-y += io-readsw-armv3.o io-writesw-armv3.o
+else
+ lib-y += io-readsw-armv4.o io-writesw-armv4.o
+endif
+
lib-$(CONFIG_ARCH_RPC) += ecard.o io-acorn.o floppydma.o
lib-$(CONFIG_ARCH_SHARK) += io-shark.o
diff --git a/arch/arm/lib/io-readsw-armv3.S b/arch/arm/lib/io-readsw-armv3.S
new file mode 100644
index 000000000000..88487c8c4f23
--- /dev/null
+++ b/arch/arm/lib/io-readsw-armv3.S
@@ -0,0 +1,106 @@
+/*
+ * linux/arch/arm/lib/io-readsw-armv3.S
+ *
+ * Copyright (C) 1995-2000 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.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+.Linsw_bad_alignment:
+ adr r0, .Linsw_bad_align_msg
+ mov r2, lr
+ b panic
+.Linsw_bad_align_msg:
+ .asciz "insw: bad buffer alignment (0x%p, lr=0x%08lX)\n"
+ .align
+
+.Linsw_align: tst r1, #1
+ bne .Linsw_bad_alignment
+
+ ldr r3, [r0]
+ strb r3, [r1], #1
+ mov r3, r3, lsr #8
+ strb r3, [r1], #1
+
+ subs r2, r2, #1
+ moveq pc, lr
+
+ENTRY(__raw_readsw)
+ teq r2, #0 @ do we have to check for the zero len?
+ moveq pc, lr
+ tst r1, #3
+ bne .Linsw_align
+
+.Linsw_aligned: mov ip, #0xff
+ orr ip, ip, ip, lsl #8
+ stmfd sp!, {r4, r5, r6, lr}
+
+ subs r2, r2, #8
+ bmi .Lno_insw_8
+
+.Linsw_8_lp: ldr r3, [r0]
+ and r3, r3, ip
+ ldr r4, [r0]
+ orr r3, r3, r4, lsl #16
+
+ ldr r4, [r0]
+ and r4, r4, ip
+ ldr r5, [r0]
+ orr r4, r4, r5, lsl #16
+
+ ldr r5, [r0]
+ and r5, r5, ip
+ ldr r6, [r0]
+ orr r5, r5, r6, lsl #16
+
+ ldr r6, [r0]
+ and r6, r6, ip
+ ldr lr, [r0]
+ orr r6, r6, lr, lsl #16
+
+ stmia r1!, {r3 - r6}
+
+ subs r2, r2, #8
+ bpl .Linsw_8_lp
+
+ tst r2, #7
+ ldmeqfd sp!, {r4, r5, r6, pc}
+
+.Lno_insw_8: tst r2, #4
+ beq .Lno_insw_4
+
+ ldr r3, [r0]
+ and r3, r3, ip
+ ldr r4, [r0]
+ orr r3, r3, r4, lsl #16
+
+ ldr r4, [r0]
+ and r4, r4, ip
+ ldr r5, [r0]
+ orr r4, r4, r5, lsl #16
+
+ stmia r1!, {r3, r4}
+
+.Lno_insw_4: tst r2, #2
+ beq .Lno_insw_2
+
+ ldr r3, [r0]
+ and r3, r3, ip
+ ldr r4, [r0]
+ orr r3, r3, r4, lsl #16
+
+ str r3, [r1], #4
+
+.Lno_insw_2: tst r2, #1
+ ldrne r3, [r0]
+ strneb r3, [r1], #1
+ movne r3, r3, lsr #8
+ strneb r3, [r1]
+
+ ldmfd sp!, {r4, r5, r6, pc}
+
+
diff --git a/arch/arm/lib/io-writesw-armv3.S b/arch/arm/lib/io-writesw-armv3.S
new file mode 100644
index 000000000000..49b800419e32
--- /dev/null
+++ b/arch/arm/lib/io-writesw-armv3.S
@@ -0,0 +1,126 @@
+/*
+ * linux/arch/arm/lib/io-writesw-armv3.S
+ *
+ * Copyright (C) 1995-2000 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.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+.Loutsw_bad_alignment:
+ adr r0, .Loutsw_bad_align_msg
+ mov r2, lr
+ b panic
+.Loutsw_bad_align_msg:
+ .asciz "outsw: bad buffer alignment (0x%p, lr=0x%08lX)\n"
+ .align
+
+.Loutsw_align: tst r1, #1
+ bne .Loutsw_bad_alignment
+
+ add r1, r1, #2
+
+ ldr r3, [r1, #-4]
+ mov r3, r3, lsr #16
+ orr r3, r3, r3, lsl #16
+ str r3, [r0]
+ subs r2, r2, #1
+ moveq pc, lr
+
+ENTRY(__raw_writesw)
+ teq r2, #0 @ do we have to check for the zero len?
+ moveq pc, lr
+ tst r1, #3
+ bne .Loutsw_align
+
+ stmfd sp!, {r4, r5, r6, lr}
+
+ subs r2, r2, #8
+ bmi .Lno_outsw_8
+
+.Loutsw_8_lp: ldmia r1!, {r3, r4, r5, r6}
+
+ mov ip, r3, lsl #16
+ orr ip, ip, ip, lsr #16
+ str ip, [r0]
+
+ mov ip, r3, lsr #16
+ orr ip, ip, ip, lsl #16
+ str ip, [r0]
+
+ mov ip, r4, lsl #16
+ orr ip, ip, ip, lsr #16
+ str ip, [r0]
+
+ mov ip, r4, lsr #16
+ orr ip, ip, ip, lsl #16
+ str ip, [r0]
+
+ mov ip, r5, lsl #16
+ orr ip, ip, ip, lsr #16
+ str ip, [r0]
+
+ mov ip, r5, lsr #16
+ orr ip, ip, ip, lsl #16
+ str ip, [r0]
+
+ mov ip, r6, lsl #16
+ orr ip, ip, ip, lsr #16
+ str ip, [r0]
+
+ mov ip, r6, lsr #16
+ orr ip, ip, ip, lsl #16
+ str ip, [r0]
+
+ subs r2, r2, #8
+ bpl .Loutsw_8_lp
+
+ tst r2, #7
+ ldmeqfd sp!, {r4, r5, r6, pc}
+
+.Lno_outsw_8: tst r2, #4
+ beq .Lno_outsw_4
+
+ ldmia r1!, {r3, r4}
+
+ mov ip, r3, lsl #16
+ orr ip, ip, ip, lsr #16
+ str ip, [r0]
+
+ mov ip, r3, lsr #16
+ orr ip, ip, ip, lsl #16
+ str ip, [r0]
+
+ mov ip, r4, lsl #16
+ orr ip, ip, ip, lsr #16
+ str ip, [r0]
+
+ mov ip, r4, lsr #16
+ orr ip, ip, ip, lsl #16
+ str ip, [r0]
+
+.Lno_outsw_4: tst r2, #2
+ beq .Lno_outsw_2
+
+ ldr r3, [r1], #4
+
+ mov ip, r3, lsl #16
+ orr ip, ip, ip, lsr #16
+ str ip, [r0]
+
+ mov ip, r3, lsr #16
+ orr ip, ip, ip, lsl #16
+ str ip, [r0]
+
+.Lno_outsw_2: tst r2, #1
+
+ ldrne r3, [r1]
+
+ movne ip, r3, lsl #16
+ orrne ip, ip, ip, lsr #16
+ strne ip, [r0]
+
+ ldmfd sp!, {r4, r5, r6, pc}
diff --git a/arch/arm/lib/uaccess.S b/arch/arm/lib/uaccess.S
new file mode 100644
index 000000000000..5c908b1cb8ed
--- /dev/null
+++ b/arch/arm/lib/uaccess.S
@@ -0,0 +1,564 @@
+/*
+ * 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 <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+#include <asm/domain.h>
+
+ .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, pull #8
+ ldr r7, [r1], #4
+ orr r3, r3, r7, push #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, pull #8
+ ldmia r1!, {r4 - r7}
+ subs ip, ip, #16
+ orr r3, r3, r4, push #24
+ mov r4, r4, pull #8
+ orr r4, r4, r5, push #24
+ mov r5, r5, pull #8
+ orr r5, r5, r6, push #24
+ mov r6, r6, pull #8
+ orr r6, r6, r7, push #24
+ stmia r0!, {r3 - r6} @ Shouldnt fault
+ bpl .Lc2u_1cpy8lp
+
+.Lc2u_1rem8lp: tst ip, #8
+ movne r3, r7, pull #8
+ ldmneia r1!, {r4, r7}
+ orrne r3, r3, r4, push #24
+ movne r4, r4, pull #8
+ orrne r4, r4, r7, push #24
+ stmneia r0!, {r3 - r4} @ Shouldnt fault
+ tst ip, #4
+ movne r3, r7, pull #8
+ ldrne r7, [r1], #4
+ orrne r3, r3, r7, push #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, pull #16
+ ldr r7, [r1], #4
+ orr r3, r3, r7, push #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, pull #16
+ ldmia r1!, {r4 - r7}
+ subs ip, ip, #16
+ orr r3, r3, r4, push #16
+ mov r4, r4, pull #16
+ orr r4, r4, r5, push #16
+ mov r5, r5, pull #16
+ orr r5, r5, r6, push #16
+ mov r6, r6, pull #16
+ orr r6, r6, r7, push #16
+ stmia r0!, {r3 - r6} @ Shouldnt fault
+ bpl .Lc2u_2cpy8lp
+
+.Lc2u_2rem8lp: tst ip, #8
+ movne r3, r7, pull #16
+ ldmneia r1!, {r4, r7}
+ orrne r3, r3, r4, push #16
+ movne r4, r4, pull #16
+ orrne r4, r4, r7, push #16
+ stmneia r0!, {r3 - r4} @ Shouldnt fault
+ tst ip, #4
+ movne r3, r7, pull #16
+ ldrne r7, [r1], #4
+ orrne r3, r3, r7, push #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, pull #24
+ ldr r7, [r1], #4
+ orr r3, r3, r7, push #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, pull #24
+ ldmia r1!, {r4 - r7}
+ subs ip, ip, #16
+ orr r3, r3, r4, push #8
+ mov r4, r4, pull #24
+ orr r4, r4, r5, push #8
+ mov r5, r5, pull #24
+ orr r5, r5, r6, push #8
+ mov r6, r6, pull #24
+ orr r6, r6, r7, push #8
+ stmia r0!, {r3 - r6} @ Shouldnt fault
+ bpl .Lc2u_3cpy8lp
+
+.Lc2u_3rem8lp: tst ip, #8
+ movne r3, r7, pull #24
+ ldmneia r1!, {r4, r7}
+ orrne r3, r3, r4, push #8
+ movne r4, r4, pull #24
+ orrne r4, r4, r7, push #8
+ stmneia r0!, {r3 - r4} @ Shouldnt fault
+ tst ip, #4
+ movne r3, r7, pull #24
+ ldrne r7, [r1], #4
+ orrne r3, r3, r7, push #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, pull #8
+USER( TUSER( ldr) r7, [r1], #4) @ May fault
+ orr r3, r3, r7, push #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, pull #8
+ ldmia r1!, {r4 - r7} @ Shouldnt fault
+ subs ip, ip, #16
+ orr r3, r3, r4, push #24
+ mov r4, r4, pull #8
+ orr r4, r4, r5, push #24
+ mov r5, r5, pull #8
+ orr r5, r5, r6, push #24
+ mov r6, r6, pull #8
+ orr r6, r6, r7, push #24
+ stmia r0!, {r3 - r6}
+ bpl .Lcfu_1cpy8lp
+
+.Lcfu_1rem8lp: tst ip, #8
+ movne r3, r7, pull #8
+ ldmneia r1!, {r4, r7} @ Shouldnt fault
+ orrne r3, r3, r4, push #24
+ movne r4, r4, pull #8
+ orrne r4, r4, r7, push #24
+ stmneia r0!, {r3 - r4}
+ tst ip, #4
+ movne r3, r7, pull #8
+USER( TUSER( ldrne) r7, [r1], #4) @ May fault
+ orrne r3, r3, r7, push #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, pull #16
+USER( TUSER( ldr) r7, [r1], #4) @ May fault
+ orr r3, r3, r7, push #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, pull #16
+ ldmia r1!, {r4 - r7} @ Shouldnt fault
+ subs ip, ip, #16
+ orr r3, r3, r4, push #16
+ mov r4, r4, pull #16
+ orr r4, r4, r5, push #16
+ mov r5, r5, pull #16
+ orr r5, r5, r6, push #16
+ mov r6, r6, pull #16
+ orr r6, r6, r7, push #16
+ stmia r0!, {r3 - r6}
+ bpl .Lcfu_2cpy8lp
+
+.Lcfu_2rem8lp: tst ip, #8
+ movne r3, r7, pull #16
+ ldmneia r1!, {r4, r7} @ Shouldnt fault
+ orrne r3, r3, r4, push #16
+ movne r4, r4, pull #16
+ orrne r4, r4, r7, push #16
+ stmneia r0!, {r3 - r4}
+ tst ip, #4
+ movne r3, r7, pull #16
+USER( TUSER( ldrne) r7, [r1], #4) @ May fault
+ orrne r3, r3, r7, push #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, pull #24
+USER( TUSER( ldr) r7, [r1], #4) @ May fault
+ orr r3, r3, r7, push #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, pull #24
+ ldmia r1!, {r4 - r7} @ Shouldnt fault
+ orr r3, r3, r4, push #8
+ mov r4, r4, pull #24
+ orr r4, r4, r5, push #8
+ mov r5, r5, pull #24
+ orr r5, r5, r6, push #8
+ mov r6, r6, pull #24
+ orr r6, r6, r7, push #8
+ stmia r0!, {r3 - r6}
+ subs ip, ip, #16
+ bpl .Lcfu_3cpy8lp
+
+.Lcfu_3rem8lp: tst ip, #8
+ movne r3, r7, pull #24
+ ldmneia r1!, {r4, r7} @ Shouldnt fault
+ orrne r3, r3, r4, push #8
+ movne r4, r4, pull #24
+ orrne r4, r4, r7, push #8
+ stmneia r0!, {r3 - r4}
+ tst ip, #4
+ movne r3, r7, pull #24
+USER( TUSER( ldrne) r7, [r1], #4) @ May fault
+ orrne r3, r3, r7, push #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
+