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xianfeng |
/*
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* linux/arch/arm/lib/uaccess.S
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*
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* Copyright (C) 1995, 1996,1997,1998 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Routines to block copy data to/from user memory
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* These are highly optimised both for the 4k page size
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* and for various alignments.
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*/
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#include
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#include
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#include
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.text
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#define PAGE_SHIFT 12
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/* Prototype: int __copy_to_user(void *to, const char *from, size_t n)
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* Purpose : copy a block to user memory from kernel memory
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* Params : to - user memory
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* : from - kernel memory
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* : n - number of bytes to copy
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* Returns : Number of bytes NOT copied.
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*/
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.Lc2u_dest_not_aligned:
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rsb ip, ip, #4
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cmp ip, #2
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ldrb r3, [r1], #1
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USER( strbt r3, [r0], #1) @ May fault
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ldrgeb r3, [r1], #1
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USER( strgebt r3, [r0], #1) @ May fault
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ldrgtb r3, [r1], #1
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USER( strgtbt r3, [r0], #1) @ May fault
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sub r2, r2, ip
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b .Lc2u_dest_aligned
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ENTRY(__copy_to_user)
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stmfd sp!, {r2, r4 - r7, lr}
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cmp r2, #4
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blt .Lc2u_not_enough
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ands ip, r0, #3
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bne .Lc2u_dest_not_aligned
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.Lc2u_dest_aligned:
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ands ip, r1, #3
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bne .Lc2u_src_not_aligned
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/*
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* Seeing as there has to be at least 8 bytes to copy, we can
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* copy one word, and force a user-mode page fault...
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*/
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.Lc2u_0fupi: subs r2, r2, #4
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addmi ip, r2, #4
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bmi .Lc2u_0nowords
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ldr r3, [r1], #4
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USER( strt r3, [r0], #4) @ May fault
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mov ip, r0, lsl #32 - PAGE_SHIFT @ On each page, use a ld/st??t instruction
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rsb ip, ip, #0
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movs ip, ip, lsr #32 - PAGE_SHIFT
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beq .Lc2u_0fupi
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/*
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* ip = max no. of bytes to copy before needing another "strt" insn
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*/
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cmp r2, ip
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movlt ip, r2
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sub r2, r2, ip
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subs ip, ip, #32
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blt .Lc2u_0rem8lp
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.Lc2u_0cpy8lp: ldmia r1!, {r3 - r6}
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stmia r0!, {r3 - r6} @ Shouldnt fault
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ldmia r1!, {r3 - r6}
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subs ip, ip, #32
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stmia r0!, {r3 - r6} @ Shouldnt fault
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bpl .Lc2u_0cpy8lp
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.Lc2u_0rem8lp: cmn ip, #16
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ldmgeia r1!, {r3 - r6}
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stmgeia r0!, {r3 - r6} @ Shouldnt fault
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tst ip, #8
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ldmneia r1!, {r3 - r4}
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stmneia r0!, {r3 - r4} @ Shouldnt fault
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tst ip, #4
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ldrne r3, [r1], #4
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strnet r3, [r0], #4 @ Shouldnt fault
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ands ip, ip, #3
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beq .Lc2u_0fupi
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.Lc2u_0nowords: teq ip, #0
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beq .Lc2u_finished
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.Lc2u_nowords: cmp ip, #2
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ldrb r3, [r1], #1
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USER( strbt r3, [r0], #1) @ May fault
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ldrgeb r3, [r1], #1
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USER( strgebt r3, [r0], #1) @ May fault
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ldrgtb r3, [r1], #1
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USER( strgtbt r3, [r0], #1) @ May fault
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b .Lc2u_finished
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.Lc2u_not_enough:
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movs ip, r2
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bne .Lc2u_nowords
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.Lc2u_finished: mov r0, #0
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ldmfd sp!, {r2, r4 - r7, pc}
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.Lc2u_src_not_aligned:
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bic r1, r1, #3
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ldr r7, [r1], #4
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cmp ip, #2
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bgt .Lc2u_3fupi
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beq .Lc2u_2fupi
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.Lc2u_1fupi: subs r2, r2, #4
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addmi ip, r2, #4
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bmi .Lc2u_1nowords
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mov r3, r7, pull #8
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ldr r7, [r1], #4
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orr r3, r3, r7, push #24
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USER( strt r3, [r0], #4) @ May fault
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mov ip, r0, lsl #32 - PAGE_SHIFT
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rsb ip, ip, #0
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movs ip, ip, lsr #32 - PAGE_SHIFT
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beq .Lc2u_1fupi
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cmp r2, ip
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movlt ip, r2
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sub r2, r2, ip
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subs ip, ip, #16
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blt .Lc2u_1rem8lp
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.Lc2u_1cpy8lp: mov r3, r7, pull #8
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ldmia r1!, {r4 - r7}
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subs ip, ip, #16
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orr r3, r3, r4, push #24
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mov r4, r4, pull #8
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orr r4, r4, r5, push #24
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mov r5, r5, pull #8
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orr r5, r5, r6, push #24
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mov r6, r6, pull #8
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orr r6, r6, r7, push #24
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stmia r0!, {r3 - r6} @ Shouldnt fault
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bpl .Lc2u_1cpy8lp
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.Lc2u_1rem8lp: tst ip, #8
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movne r3, r7, pull #8
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ldmneia r1!, {r4, r7}
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orrne r3, r3, r4, push #24
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movne r4, r4, pull #8
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orrne r4, r4, r7, push #24
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stmneia r0!, {r3 - r4} @ Shouldnt fault
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tst ip, #4
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movne r3, r7, pull #8
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ldrne r7, [r1], #4
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orrne r3, r3, r7, push #24
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strnet r3, [r0], #4 @ Shouldnt fault
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ands ip, ip, #3
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beq .Lc2u_1fupi
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.Lc2u_1nowords: mov r3, r7, get_byte_1
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teq ip, #0
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beq .Lc2u_finished
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cmp ip, #2
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USER( strbt r3, [r0], #1) @ May fault
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movge r3, r7, get_byte_2
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USER( strgebt r3, [r0], #1) @ May fault
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movgt r3, r7, get_byte_3
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USER( strgtbt r3, [r0], #1) @ May fault
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b .Lc2u_finished
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.Lc2u_2fupi: subs r2, r2, #4
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addmi ip, r2, #4
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bmi .Lc2u_2nowords
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mov r3, r7, pull #16
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ldr r7, [r1], #4
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orr r3, r3, r7, push #16
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USER( strt r3, [r0], #4) @ May fault
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mov ip, r0, lsl #32 - PAGE_SHIFT
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rsb ip, ip, #0
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movs ip, ip, lsr #32 - PAGE_SHIFT
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beq .Lc2u_2fupi
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cmp r2, ip
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movlt ip, r2
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sub r2, r2, ip
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subs ip, ip, #16
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blt .Lc2u_2rem8lp
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.Lc2u_2cpy8lp: mov r3, r7, pull #16
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ldmia r1!, {r4 - r7}
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subs ip, ip, #16
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orr r3, r3, r4, push #16
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mov r4, r4, pull #16
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orr r4, r4, r5, push #16
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mov r5, r5, pull #16
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orr r5, r5, r6, push #16
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mov r6, r6, pull #16
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orr r6, r6, r7, push #16
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stmia r0!, {r3 - r6} @ Shouldnt fault
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bpl .Lc2u_2cpy8lp
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.Lc2u_2rem8lp: tst ip, #8
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movne r3, r7, pull #16
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ldmneia r1!, {r4, r7}
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orrne r3, r3, r4, push #16
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movne r4, r4, pull #16
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orrne r4, r4, r7, push #16
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stmneia r0!, {r3 - r4} @ Shouldnt fault
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tst ip, #4
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movne r3, r7, pull #16
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| 210 |
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ldrne r7, [r1], #4
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orrne r3, r3, r7, push #16
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strnet r3, [r0], #4 @ Shouldnt fault
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ands ip, ip, #3
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beq .Lc2u_2fupi
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.Lc2u_2nowords: mov r3, r7, get_byte_2
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| 216 |
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teq ip, #0
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beq .Lc2u_finished
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| 218 |
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cmp ip, #2
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| 219 |
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USER( strbt r3, [r0], #1) @ May fault
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| 220 |
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movge r3, r7, get_byte_3
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| 221 |
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USER( strgebt r3, [r0], #1) @ May fault
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| 222 |
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ldrgtb r3, [r1], #0
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| 223 |
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USER( strgtbt r3, [r0], #1) @ May fault
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| 224 |
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b .Lc2u_finished
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| 226 |
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.Lc2u_3fupi: subs r2, r2, #4
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addmi ip, r2, #4
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| 228 |
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bmi .Lc2u_3nowords
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| 229 |
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mov r3, r7, pull #24
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| 230 |
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ldr r7, [r1], #4
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| 231 |
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orr r3, r3, r7, push #8
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| 232 |
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USER( strt r3, [r0], #4) @ May fault
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| 233 |
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mov ip, r0, lsl #32 - PAGE_SHIFT
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| 234 |
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rsb ip, ip, #0
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| 235 |
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movs ip, ip, lsr #32 - PAGE_SHIFT
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| 236 |
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beq .Lc2u_3fupi
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| 237 |
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cmp r2, ip
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| 238 |
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movlt ip, r2
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| 239 |
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sub r2, r2, ip
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| 240 |
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subs ip, ip, #16
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| 241 |
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blt .Lc2u_3rem8lp
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| 242 |
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| 243 |
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.Lc2u_3cpy8lp: mov r3, r7, pull #24
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| 244 |
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ldmia r1!, {r4 - r7}
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| 245 |
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subs ip, ip, #16
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| 246 |
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orr r3, r3, r4, push #8
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| 247 |
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mov r4, r4, pull #24
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| 248 |
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orr r4, r4, r5, push #8
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| 249 |
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mov r5, r5, pull #24
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| 250 |
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orr r5, r5, r6, push #8
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| 251 |
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mov r6, r6, pull #24
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| 252 |
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orr r6, r6, r7, push #8
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| 253 |
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stmia r0!, {r3 - r6} @ Shouldnt fault
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| 254 |
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bpl .Lc2u_3cpy8lp
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| 255 |
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| 256 |
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.Lc2u_3rem8lp: tst ip, #8
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| 257 |
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movne r3, r7, pull #24
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| 258 |
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ldmneia r1!, {r4, r7}
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| 259 |
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orrne r3, r3, r4, push #8
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| 260 |
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movne r4, r4, pull #24
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| 261 |
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orrne r4, r4, r7, push #8
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| 262 |
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stmneia r0!, {r3 - r4} @ Shouldnt fault
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| 263 |
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tst ip, #4
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| 264 |
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movne r3, r7, pull #24
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| 265 |
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ldrne r7, [r1], #4
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| 266 |
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orrne r3, r3, r7, push #8
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| 267 |
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strnet r3, [r0], #4 @ Shouldnt fault
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| 268 |
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ands ip, ip, #3
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| 269 |
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beq .Lc2u_3fupi
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| 270 |
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.Lc2u_3nowords: mov r3, r7, get_byte_3
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| 271 |
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teq ip, #0
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| 272 |
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beq .Lc2u_finished
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| 273 |
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cmp ip, #2
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| 274 |
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USER( strbt r3, [r0], #1) @ May fault
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| 275 |
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ldrgeb r3, [r1], #1
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| 276 |
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USER( strgebt r3, [r0], #1) @ May fault
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| 277 |
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ldrgtb r3, [r1], #0
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| 278 |
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USER( strgtbt r3, [r0], #1) @ May fault
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| 279 |
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b .Lc2u_finished
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| 280 |
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|
| 281 |
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.section .fixup,"ax"
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| 282 |
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.align 0
|
| 283 |
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9001: ldmfd sp!, {r0, r4 - r7, pc}
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| 284 |
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.previous
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| 285 |
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|
| 286 |
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/* Prototype: unsigned long __copy_from_user(void *to,const void *from,unsigned long n);
|
| 287 |
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* Purpose : copy a block from user memory to kernel memory
|
| 288 |
|
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* Params : to - kernel memory
|
| 289 |
|
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* : from - user memory
|
| 290 |
|
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* : n - number of bytes to copy
|
| 291 |
|
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* Returns : Number of bytes NOT copied.
|
| 292 |
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*/
|
| 293 |
|
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.Lcfu_dest_not_aligned:
|
| 294 |
|
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rsb ip, ip, #4
|
| 295 |
|
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cmp ip, #2
|
| 296 |
|
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USER( ldrbt r3, [r1], #1) @ May fault
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| 297 |
|
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strb r3, [r0], #1
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| 298 |
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USER( ldrgebt r3, [r1], #1) @ May fault
|
| 299 |
|
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strgeb r3, [r0], #1
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| 300 |
|
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USER( ldrgtbt r3, [r1], #1) @ May fault
|
| 301 |
|
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strgtb r3, [r0], #1
|
| 302 |
|
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sub r2, r2, ip
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| 303 |
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b .Lcfu_dest_aligned
|
| 304 |
|
|
|
| 305 |
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ENTRY(__copy_from_user)
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| 306 |
|
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stmfd sp!, {r0, r2, r4 - r7, lr}
|
| 307 |
|
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cmp r2, #4
|
| 308 |
|
|
blt .Lcfu_not_enough
|
| 309 |
|
|
ands ip, r0, #3
|
| 310 |
|
|
bne .Lcfu_dest_not_aligned
|
| 311 |
|
|
.Lcfu_dest_aligned:
|
| 312 |
|
|
ands ip, r1, #3
|
| 313 |
|
|
bne .Lcfu_src_not_aligned
|
| 314 |
|
|
|
| 315 |
|
|
/*
|
| 316 |
|
|
* Seeing as there has to be at least 8 bytes to copy, we can
|
| 317 |
|
|
* copy one word, and force a user-mode page fault...
|
| 318 |
|
|
*/
|
| 319 |
|
|
|
| 320 |
|
|
.Lcfu_0fupi: subs r2, r2, #4
|
| 321 |
|
|
addmi ip, r2, #4
|
| 322 |
|
|
bmi .Lcfu_0nowords
|
| 323 |
|
|
USER( ldrt r3, [r1], #4)
|
| 324 |
|
|
str r3, [r0], #4
|
| 325 |
|
|
mov ip, r1, lsl #32 - PAGE_SHIFT @ On each page, use a ld/st??t instruction
|
| 326 |
|
|
rsb ip, ip, #0
|
| 327 |
|
|
movs ip, ip, lsr #32 - PAGE_SHIFT
|
| 328 |
|
|
beq .Lcfu_0fupi
|
| 329 |
|
|
/*
|
| 330 |
|
|
* ip = max no. of bytes to copy before needing another "strt" insn
|
| 331 |
|
|
*/
|
| 332 |
|
|
cmp r2, ip
|
| 333 |
|
|
movlt ip, r2
|
| 334 |
|
|
sub r2, r2, ip
|
| 335 |
|
|
subs ip, ip, #32
|
| 336 |
|
|
blt .Lcfu_0rem8lp
|
| 337 |
|
|
|
| 338 |
|
|
.Lcfu_0cpy8lp: ldmia r1!, {r3 - r6} @ Shouldnt fault
|
| 339 |
|
|
stmia r0!, {r3 - r6}
|
| 340 |
|
|
ldmia r1!, {r3 - r6} @ Shouldnt fault
|
| 341 |
|
|
subs ip, ip, #32
|
| 342 |
|
|
stmia r0!, {r3 - r6}
|
| 343 |
|
|
bpl .Lcfu_0cpy8lp
|
| 344 |
|
|
|
| 345 |
|
|
.Lcfu_0rem8lp: cmn ip, #16
|
| 346 |
|
|
ldmgeia r1!, {r3 - r6} @ Shouldnt fault
|
| 347 |
|
|
stmgeia r0!, {r3 - r6}
|
| 348 |
|
|
tst ip, #8
|
| 349 |
|
|
ldmneia r1!, {r3 - r4} @ Shouldnt fault
|
| 350 |
|
|
stmneia r0!, {r3 - r4}
|
| 351 |
|
|
tst ip, #4
|
| 352 |
|
|
ldrnet r3, [r1], #4 @ Shouldnt fault
|
| 353 |
|
|
strne r3, [r0], #4
|
| 354 |
|
|
ands ip, ip, #3
|
| 355 |
|
|
beq .Lcfu_0fupi
|
| 356 |
|
|
.Lcfu_0nowords: teq ip, #0
|
| 357 |
|
|
beq .Lcfu_finished
|
| 358 |
|
|
.Lcfu_nowords: cmp ip, #2
|
| 359 |
|
|
USER( ldrbt r3, [r1], #1) @ May fault
|
| 360 |
|
|
strb r3, [r0], #1
|
| 361 |
|
|
USER( ldrgebt r3, [r1], #1) @ May fault
|
| 362 |
|
|
strgeb r3, [r0], #1
|
| 363 |
|
|
USER( ldrgtbt r3, [r1], #1) @ May fault
|
| 364 |
|
|
strgtb r3, [r0], #1
|
| 365 |
|
|
b .Lcfu_finished
|
| 366 |
|
|
|
| 367 |
|
|
.Lcfu_not_enough:
|
| 368 |
|
|
movs ip, r2
|
| 369 |
|
|
bne .Lcfu_nowords
|
| 370 |
|
|
.Lcfu_finished: mov r0, #0
|
| 371 |
|
|
add sp, sp, #8
|
| 372 |
|
|
ldmfd sp!, {r4 - r7, pc}
|
| 373 |
|
|
|
| 374 |
|
|
.Lcfu_src_not_aligned:
|
| 375 |
|
|
bic r1, r1, #3
|
| 376 |
|
|
USER( ldrt r7, [r1], #4) @ May fault
|
| 377 |
|
|
cmp ip, #2
|
| 378 |
|
|
bgt .Lcfu_3fupi
|
| 379 |
|
|
beq .Lcfu_2fupi
|
| 380 |
|
|
.Lcfu_1fupi: subs r2, r2, #4
|
| 381 |
|
|
addmi ip, r2, #4
|
| 382 |
|
|
bmi .Lcfu_1nowords
|
| 383 |
|
|
mov r3, r7, pull #8
|
| 384 |
|
|
USER( ldrt r7, [r1], #4) @ May fault
|
| 385 |
|
|
orr r3, r3, r7, push #24
|
| 386 |
|
|
str r3, [r0], #4
|
| 387 |
|
|
mov ip, r1, lsl #32 - PAGE_SHIFT
|
| 388 |
|
|
rsb ip, ip, #0
|
| 389 |
|
|
movs ip, ip, lsr #32 - PAGE_SHIFT
|
| 390 |
|
|
beq .Lcfu_1fupi
|
| 391 |
|
|
cmp r2, ip
|
| 392 |
|
|
movlt ip, r2
|
| 393 |
|
|
sub r2, r2, ip
|
| 394 |
|
|
subs ip, ip, #16
|
| 395 |
|
|
blt .Lcfu_1rem8lp
|
| 396 |
|
|
|
| 397 |
|
|
.Lcfu_1cpy8lp: mov r3, r7, pull #8
|
| 398 |
|
|
ldmia r1!, {r4 - r7} @ Shouldnt fault
|
| 399 |
|
|
subs ip, ip, #16
|
| 400 |
|
|
orr r3, r3, r4, push #24
|
| 401 |
|
|
mov r4, r4, pull #8
|
| 402 |
|
|
orr r4, r4, r5, push #24
|
| 403 |
|
|
mov r5, r5, pull #8
|
| 404 |
|
|
orr r5, r5, r6, push #24
|
| 405 |
|
|
mov r6, r6, pull #8
|
| 406 |
|
|
orr r6, r6, r7, push #24
|
| 407 |
|
|
stmia r0!, {r3 - r6}
|
| 408 |
|
|
bpl .Lcfu_1cpy8lp
|
| 409 |
|
|
|
| 410 |
|
|
.Lcfu_1rem8lp: tst ip, #8
|
| 411 |
|
|
movne r3, r7, pull #8
|
| 412 |
|
|
ldmneia r1!, {r4, r7} @ Shouldnt fault
|
| 413 |
|
|
orrne r3, r3, r4, push #24
|
| 414 |
|
|
movne r4, r4, pull #8
|
| 415 |
|
|
orrne r4, r4, r7, push #24
|
| 416 |
|
|
stmneia r0!, {r3 - r4}
|
| 417 |
|
|
tst ip, #4
|
| 418 |
|
|
movne r3, r7, pull #8
|
| 419 |
|
|
USER( ldrnet r7, [r1], #4) @ May fault
|
| 420 |
|
|
orrne r3, r3, r7, push #24
|
| 421 |
|
|
strne r3, [r0], #4
|
| 422 |
|
|
ands ip, ip, #3
|
| 423 |
|
|
beq .Lcfu_1fupi
|
| 424 |
|
|
.Lcfu_1nowords: mov r3, r7, get_byte_1
|
| 425 |
|
|
teq ip, #0
|
| 426 |
|
|
beq .Lcfu_finished
|
| 427 |
|
|
cmp ip, #2
|
| 428 |
|
|
strb r3, [r0], #1
|
| 429 |
|
|
movge r3, r7, get_byte_2
|
| 430 |
|
|
strgeb r3, [r0], #1
|
| 431 |
|
|
movgt r3, r7, get_byte_3
|
| 432 |
|
|
strgtb r3, [r0], #1
|
| 433 |
|
|
b .Lcfu_finished
|
| 434 |
|
|
|
| 435 |
|
|
.Lcfu_2fupi: subs r2, r2, #4
|
| 436 |
|
|
addmi ip, r2, #4
|
| 437 |
|
|
bmi .Lcfu_2nowords
|
| 438 |
|
|
mov r3, r7, pull #16
|
| 439 |
|
|
USER( ldrt r7, [r1], #4) @ May fault
|
| 440 |
|
|
orr r3, r3, r7, push #16
|
| 441 |
|
|
str r3, [r0], #4
|
| 442 |
|
|
mov ip, r1, lsl #32 - PAGE_SHIFT
|
| 443 |
|
|
rsb ip, ip, #0
|
| 444 |
|
|
movs ip, ip, lsr #32 - PAGE_SHIFT
|
| 445 |
|
|
beq .Lcfu_2fupi
|
| 446 |
|
|
cmp r2, ip
|
| 447 |
|
|
movlt ip, r2
|
| 448 |
|
|
sub r2, r2, ip
|
| 449 |
|
|
subs ip, ip, #16
|
| 450 |
|
|
blt .Lcfu_2rem8lp
|
| 451 |
|
|
|
| 452 |
|
|
|
| 453 |
|
|
.Lcfu_2cpy8lp: mov r3, r7, pull #16
|
| 454 |
|
|
ldmia r1!, {r4 - r7} @ Shouldnt fault
|
| 455 |
|
|
subs ip, ip, #16
|
| 456 |
|
|
orr r3, r3, r4, push #16
|
| 457 |
|
|
mov r4, r4, pull #16
|
| 458 |
|
|
orr r4, r4, r5, push #16
|
| 459 |
|
|
mov r5, r5, pull #16
|
| 460 |
|
|
orr r5, r5, r6, push #16
|
| 461 |
|
|
mov r6, r6, pull #16
|
| 462 |
|
|
orr r6, r6, r7, push #16
|
| 463 |
|
|
stmia r0!, {r3 - r6}
|
| 464 |
|
|
bpl .Lcfu_2cpy8lp
|
| 465 |
|
|
|
| 466 |
|
|
.Lcfu_2rem8lp: tst ip, #8
|
| 467 |
|
|
movne r3, r7, pull #16
|
| 468 |
|
|
ldmneia r1!, {r4, r7} @ Shouldnt fault
|
| 469 |
|
|
orrne r3, r3, r4, push #16
|
| 470 |
|
|
movne r4, r4, pull #16
|
| 471 |
|
|
orrne r4, r4, r7, push #16
|
| 472 |
|
|
stmneia r0!, {r3 - r4}
|
| 473 |
|
|
tst ip, #4
|
| 474 |
|
|
movne r3, r7, pull #16
|
| 475 |
|
|
USER( ldrnet r7, [r1], #4) @ May fault
|
| 476 |
|
|
orrne r3, r3, r7, push #16
|
| 477 |
|
|
strne r3, [r0], #4
|
| 478 |
|
|
ands ip, ip, #3
|
| 479 |
|
|
beq .Lcfu_2fupi
|
| 480 |
|
|
.Lcfu_2nowords: mov r3, r7, get_byte_2
|
| 481 |
|
|
teq ip, #0
|
| 482 |
|
|
beq .Lcfu_finished
|
| 483 |
|
|
cmp ip, #2
|
| 484 |
|
|
strb r3, [r0], #1
|
| 485 |
|
|
movge r3, r7, get_byte_3
|
| 486 |
|
|
strgeb r3, [r0], #1
|
| 487 |
|
|
USER( ldrgtbt r3, [r1], #0) @ May fault
|
| 488 |
|
|
strgtb r3, [r0], #1
|
| 489 |
|
|
b .Lcfu_finished
|
| 490 |
|
|
|
| 491 |
|
|
.Lcfu_3fupi: subs r2, r2, #4
|
| 492 |
|
|
addmi ip, r2, #4
|
| 493 |
|
|
bmi .Lcfu_3nowords
|
| 494 |
|
|
mov r3, r7, pull #24
|
| 495 |
|
|
USER( ldrt r7, [r1], #4) @ May fault
|
| 496 |
|
|
orr r3, r3, r7, push #8
|
| 497 |
|
|
str r3, [r0], #4
|
| 498 |
|
|
mov ip, r1, lsl #32 - PAGE_SHIFT
|
| 499 |
|
|
rsb ip, ip, #0
|
| 500 |
|
|
movs ip, ip, lsr #32 - PAGE_SHIFT
|
| 501 |
|
|
beq .Lcfu_3fupi
|
| 502 |
|
|
cmp r2, ip
|
| 503 |
|
|
movlt ip, r2
|
| 504 |
|
|
sub r2, r2, ip
|
| 505 |
|
|
subs ip, ip, #16
|
| 506 |
|
|
blt .Lcfu_3rem8lp
|
| 507 |
|
|
|
| 508 |
|
|
.Lcfu_3cpy8lp: mov r3, r7, pull #24
|
| 509 |
|
|
ldmia r1!, {r4 - r7} @ Shouldnt fault
|
| 510 |
|
|
orr r3, r3, r4, push #8
|
| 511 |
|
|
mov r4, r4, pull #24
|
| 512 |
|
|
orr r4, r4, r5, push #8
|
| 513 |
|
|
mov r5, r5, pull #24
|
| 514 |
|
|
orr r5, r5, r6, push #8
|
| 515 |
|
|
mov r6, r6, pull #24
|
| 516 |
|
|
orr r6, r6, r7, push #8
|
| 517 |
|
|
stmia r0!, {r3 - r6}
|
| 518 |
|
|
subs ip, ip, #16
|
| 519 |
|
|
bpl .Lcfu_3cpy8lp
|
| 520 |
|
|
|
| 521 |
|
|
.Lcfu_3rem8lp: tst ip, #8
|
| 522 |
|
|
movne r3, r7, pull #24
|
| 523 |
|
|
ldmneia r1!, {r4, r7} @ Shouldnt fault
|
| 524 |
|
|
orrne r3, r3, r4, push #8
|
| 525 |
|
|
movne r4, r4, pull #24
|
| 526 |
|
|
orrne r4, r4, r7, push #8
|
| 527 |
|
|
stmneia r0!, {r3 - r4}
|
| 528 |
|
|
tst ip, #4
|
| 529 |
|
|
movne r3, r7, pull #24
|
| 530 |
|
|
USER( ldrnet r7, [r1], #4) @ May fault
|
| 531 |
|
|
orrne r3, r3, r7, push #8
|
| 532 |
|
|
strne r3, [r0], #4
|
| 533 |
|
|
ands ip, ip, #3
|
| 534 |
|
|
beq .Lcfu_3fupi
|
| 535 |
|
|
.Lcfu_3nowords: mov r3, r7, get_byte_3
|
| 536 |
|
|
teq ip, #0
|
| 537 |
|
|
beq .Lcfu_finished
|
| 538 |
|
|
cmp ip, #2
|
| 539 |
|
|
strb r3, [r0], #1
|
| 540 |
|
|
USER( ldrgebt r3, [r1], #1) @ May fault
|
| 541 |
|
|
strgeb r3, [r0], #1
|
| 542 |
|
|
USER( ldrgtbt r3, [r1], #1) @ May fault
|
| 543 |
|
|
strgtb r3, [r0], #1
|
| 544 |
|
|
b .Lcfu_finished
|
| 545 |
|
|
|
| 546 |
|
|
.section .fixup,"ax"
|
| 547 |
|
|
.align 0
|
| 548 |
|
|
/*
|
| 549 |
|
|
* We took an exception. r0 contains a pointer to
|
| 550 |
|
|
* the byte not copied.
|
| 551 |
|
|
*/
|
| 552 |
|
|
9001: ldr r2, [sp], #4 @ void *to
|
| 553 |
|
|
sub r2, r0, r2 @ bytes copied
|
| 554 |
|
|
ldr r1, [sp], #4 @ unsigned long count
|
| 555 |
|
|
subs r4, r1, r2 @ bytes left to copy
|
| 556 |
|
|
movne r1, r4
|
| 557 |
|
|
blne __memzero
|
| 558 |
|
|
mov r0, r4
|
| 559 |
|
|
ldmfd sp!, {r4 - r7, pc}
|
| 560 |
|
|
.previous
|
| 561 |
|
|
|
