7ba11a9c15
Patch from Nicolas Pitre For assembly labels to actually be local they must start with ".L" and not only "." otherwise they still remain visible in the final link and clutter kallsyms needlessly, and possibly make for unclear symbolic backtrace. This patch simply inserts a"L" where appropriate. The code itself is unchanged. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
562 lines
13 KiB
ArmAsm
562 lines
13 KiB
ArmAsm
/*
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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 <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/errno.h>
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.text
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#define PAGE_SHIFT 12
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/* Prototype: int __arch_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(__arch_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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LOADREGS(fd,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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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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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_3
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USER( strgebt r3, [r0], #1) @ May fault
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ldrgtb r3, [r1], #0
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USER( strgtbt r3, [r0], #1) @ May fault
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b .Lc2u_finished
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.Lc2u_3fupi: subs r2, r2, #4
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addmi ip, r2, #4
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bmi .Lc2u_3nowords
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mov r3, r7, pull #24
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ldr r7, [r1], #4
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orr r3, r3, r7, push #8
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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_3fupi
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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_3rem8lp
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.Lc2u_3cpy8lp: mov r3, r7, pull #24
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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 #8
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mov r4, r4, pull #24
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orr r4, r4, r5, push #8
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mov r5, r5, pull #24
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orr r5, r5, r6, push #8
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mov r6, r6, pull #24
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orr r6, r6, r7, push #8
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stmia r0!, {r3 - r6} @ Shouldnt fault
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bpl .Lc2u_3cpy8lp
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.Lc2u_3rem8lp: tst ip, #8
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movne r3, r7, pull #24
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ldmneia r1!, {r4, r7}
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orrne r3, r3, r4, push #8
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movne r4, r4, pull #24
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orrne r4, r4, r7, push #8
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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 #24
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ldrne r7, [r1], #4
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orrne r3, r3, r7, push #8
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strnet r3, [r0], #4 @ Shouldnt fault
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ands ip, ip, #3
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beq .Lc2u_3fupi
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.Lc2u_3nowords: mov r3, r7, get_byte_3
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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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ldrgeb r3, [r1], #1
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USER( strgebt r3, [r0], #1) @ May fault
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ldrgtb r3, [r1], #0
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USER( strgtbt r3, [r0], #1) @ May fault
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b .Lc2u_finished
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.section .fixup,"ax"
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.align 0
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9001: LOADREGS(fd,sp!, {r0, r4 - r7, pc})
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.previous
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/* Prototype: unsigned long __arch_copy_from_user(void *to,const void *from,unsigned long n);
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* Purpose : copy a block from user memory to kernel memory
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* Params : to - kernel memory
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* : from - user 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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.Lcfu_dest_not_aligned:
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rsb ip, ip, #4
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cmp ip, #2
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USER( ldrbt r3, [r1], #1) @ May fault
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strb r3, [r0], #1
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USER( ldrgebt r3, [r1], #1) @ May fault
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strgeb r3, [r0], #1
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USER( ldrgtbt r3, [r1], #1) @ May fault
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strgtb r3, [r0], #1
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sub r2, r2, ip
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b .Lcfu_dest_aligned
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ENTRY(__arch_copy_from_user)
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stmfd sp!, {r0, r2, r4 - r7, lr}
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cmp r2, #4
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blt .Lcfu_not_enough
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ands ip, r0, #3
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bne .Lcfu_dest_not_aligned
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.Lcfu_dest_aligned:
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ands ip, r1, #3
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bne .Lcfu_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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.Lcfu_0fupi: subs r2, r2, #4
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addmi ip, r2, #4
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bmi .Lcfu_0nowords
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USER( ldrt r3, [r1], #4)
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str r3, [r0], #4
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mov ip, r1, 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 .Lcfu_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 .Lcfu_0rem8lp
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.Lcfu_0cpy8lp: ldmia r1!, {r3 - r6} @ Shouldnt fault
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stmia r0!, {r3 - r6}
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ldmia r1!, {r3 - r6} @ Shouldnt fault
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subs ip, ip, #32
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stmia r0!, {r3 - r6}
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bpl .Lcfu_0cpy8lp
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.Lcfu_0rem8lp: cmn ip, #16
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ldmgeia r1!, {r3 - r6} @ Shouldnt fault
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stmgeia r0!, {r3 - r6}
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tst ip, #8
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ldmneia r1!, {r3 - r4} @ Shouldnt fault
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stmneia r0!, {r3 - r4}
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tst ip, #4
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ldrnet r3, [r1], #4 @ Shouldnt fault
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strne r3, [r0], #4
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ands ip, ip, #3
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beq .Lcfu_0fupi
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.Lcfu_0nowords: teq ip, #0
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beq .Lcfu_finished
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.Lcfu_nowords: cmp ip, #2
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USER( ldrbt r3, [r1], #1) @ May fault
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strb r3, [r0], #1
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USER( ldrgebt r3, [r1], #1) @ May fault
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strgeb r3, [r0], #1
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USER( ldrgtbt r3, [r1], #1) @ May fault
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strgtb r3, [r0], #1
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b .Lcfu_finished
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.Lcfu_not_enough:
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movs ip, r2
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bne .Lcfu_nowords
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.Lcfu_finished: mov r0, #0
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add sp, sp, #8
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LOADREGS(fd,sp!,{r4 - r7, pc})
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.Lcfu_src_not_aligned:
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bic r1, r1, #3
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USER( ldrt r7, [r1], #4) @ May fault
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cmp ip, #2
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bgt .Lcfu_3fupi
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beq .Lcfu_2fupi
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.Lcfu_1fupi: subs r2, r2, #4
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addmi ip, r2, #4
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bmi .Lcfu_1nowords
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mov r3, r7, pull #8
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USER( ldrt r7, [r1], #4) @ May fault
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orr r3, r3, r7, push #24
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str r3, [r0], #4
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mov ip, r1, 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 .Lcfu_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 .Lcfu_1rem8lp
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.Lcfu_1cpy8lp: mov r3, r7, pull #8
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ldmia r1!, {r4 - r7} @ Shouldnt fault
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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}
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bpl .Lcfu_1cpy8lp
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.Lcfu_1rem8lp: tst ip, #8
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movne r3, r7, pull #8
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ldmneia r1!, {r4, r7} @ Shouldnt fault
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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}
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tst ip, #4
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movne r3, r7, pull #8
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USER( ldrnet r7, [r1], #4) @ May fault
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orrne r3, r3, r7, push #24
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strne r3, [r0], #4
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ands ip, ip, #3
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beq .Lcfu_1fupi
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.Lcfu_1nowords: mov r3, r7, get_byte_1
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teq ip, #0
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beq .Lcfu_finished
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cmp ip, #2
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strb r3, [r0], #1
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movge r3, r7, get_byte_2
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strgeb r3, [r0], #1
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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( ldrt 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( ldrnet 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( ldrgtbt 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( ldrt 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( ldrnet 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( ldrgebt r3, [r1], #1) @ May fault
|
|
strgeb r3, [r0], #1
|
|
USER( ldrgtbt r3, [r1], #1) @ May fault
|
|
strgtb r3, [r0], #1
|
|
b .Lcfu_finished
|
|
|
|
.section .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
|
|
LOADREGS(fd,sp!, {r4 - r7, pc})
|
|
.previous
|
|
|