205 lines
3.6 KiB
ArmAsm
205 lines
3.6 KiB
ArmAsm
/*
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* OpenRISC string.S
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* Modifications for the OpenRISC architecture:
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/linkage.h>
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#include <asm/errno.h>
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/*
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* this can be optimized by doing gcc inline assemlby with
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* proper constraints (no need to save args registers...)
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*
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*/
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/*
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*
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* int __copy_tofrom_user(void *to, const void *from, unsigned long size);
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*
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* NOTE: it returns number of bytes NOT copied !!!
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*
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*/
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.global __copy_tofrom_user
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__copy_tofrom_user:
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l.addi r1,r1,-12
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l.sw 0(r1),r6
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l.sw 4(r1),r4
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l.sw 8(r1),r3
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l.addi r11,r5,0
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2: l.sfeq r11,r0
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l.bf 1f
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l.addi r11,r11,-1
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8: l.lbz r6,0(r4)
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9: l.sb 0(r3),r6
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l.addi r3,r3,1
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l.j 2b
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l.addi r4,r4,1
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1:
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l.addi r11,r11,1 // r11 holds the return value
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l.lwz r6,0(r1)
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l.lwz r4,4(r1)
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l.lwz r3,8(r1)
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l.jr r9
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l.addi r1,r1,12
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.section .fixup, "ax"
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99:
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l.j 1b
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l.nop
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.previous
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.section __ex_table, "a"
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.long 8b, 99b // read fault
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.long 9b, 99b // write fault
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.previous
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/*
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* unsigned long clear_user(void *addr, unsigned long size) ;
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*
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* NOTE: it returns number of bytes NOT cleared !!!
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*/
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.global __clear_user
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__clear_user:
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l.addi r1,r1,-8
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l.sw 0(r1),r4
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l.sw 4(r1),r3
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2: l.sfeq r4,r0
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l.bf 1f
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l.addi r4,r4,-1
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9: l.sb 0(r3),r0
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l.j 2b
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l.addi r3,r3,1
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1:
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l.addi r11,r4,1
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l.lwz r4,0(r1)
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l.lwz r3,4(r1)
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l.jr r9
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l.addi r1,r1,8
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.section .fixup, "ax"
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99:
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l.j 1b
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l.nop
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.previous
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.section __ex_table, "a"
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.long 9b, 99b // write fault
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.previous
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/*
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* long strncpy_from_user(char *dst, const char *src, long count)
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*
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*
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*/
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.global __strncpy_from_user
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__strncpy_from_user:
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l.addi r1,r1,-16
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l.sw 0(r1),r6
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l.sw 4(r1),r5
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l.sw 8(r1),r4
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l.sw 12(r1),r3
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l.addi r11,r5,0
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2: l.sfeq r5,r0
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l.bf 1f
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l.addi r5,r5,-1
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8: l.lbz r6,0(r4)
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l.sfeq r6,r0
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l.bf 1f
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9: l.sb 0(r3),r6
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l.addi r3,r3,1
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l.j 2b
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l.addi r4,r4,1
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1:
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l.lwz r6,0(r1)
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l.addi r5,r5,1
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l.sub r11,r11,r5 // r11 holds the return value
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l.lwz r6,0(r1)
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l.lwz r5,4(r1)
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l.lwz r4,8(r1)
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l.lwz r3,12(r1)
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l.jr r9
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l.addi r1,r1,16
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.section .fixup, "ax"
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99:
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l.movhi r11,hi(-EFAULT)
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l.ori r11,r11,lo(-EFAULT)
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l.lwz r6,0(r1)
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l.lwz r5,4(r1)
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l.lwz r4,8(r1)
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l.lwz r3,12(r1)
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l.jr r9
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l.addi r1,r1,16
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.previous
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.section __ex_table, "a"
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.long 8b, 99b // read fault
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.previous
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/*
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* extern int __strnlen_user(const char *str, long len, unsigned long top);
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*
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*
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* RTRN: - length of a string including NUL termination character
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* - on page fault 0
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*/
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.global __strnlen_user
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__strnlen_user:
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l.addi r1,r1,-8
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l.sw 0(r1),r6
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l.sw 4(r1),r3
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l.addi r11,r0,0
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2: l.sfeq r11,r4
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l.bf 1f
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l.addi r11,r11,1
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8: l.lbz r6,0(r3)
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l.sfeq r6,r0
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l.bf 1f
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l.sfgeu r3,r5 // are we over the top ?
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l.bf 99f
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l.j 2b
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l.addi r3,r3,1
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1:
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l.lwz r6,0(r1)
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l.lwz r3,4(r1)
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l.jr r9
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l.addi r1,r1,8
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.section .fixup, "ax"
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99:
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l.addi r11,r0,0
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l.lwz r6,0(r1)
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l.lwz r3,4(r1)
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l.jr r9
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l.addi r1,r1,8
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.previous
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.section __ex_table, "a"
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.long 8b, 99b // read fault
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.previous
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