^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * OpenRISC string.S
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Linux architectural port borrowing liberally from similar works of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * others. All original copyrights apply as per the original source
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * declaration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Modifications for the OpenRISC architecture:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * this can be optimized by doing gcc inline assemlby with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * proper constraints (no need to save args registers...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * int __copy_tofrom_user(void *to, const void *from, unsigned long size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * NOTE: it returns number of bytes NOT copied !!!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) .global __copy_tofrom_user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) __copy_tofrom_user:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) l.addi r1,r1,-12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) l.sw 0(r1),r6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) l.sw 4(r1),r4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) l.sw 8(r1),r3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) l.addi r11,r5,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 2: l.sfeq r11,r0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) l.bf 1f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) l.addi r11,r11,-1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 8: l.lbz r6,0(r4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 9: l.sb 0(r3),r6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) l.addi r3,r3,1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) l.j 2b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) l.addi r4,r4,1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) l.addi r11,r11,1 // r11 holds the return value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) l.lwz r6,0(r1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) l.lwz r4,4(r1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) l.lwz r3,8(r1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) l.jr r9
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) l.addi r1,r1,12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) .section .fixup, "ax"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 99:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) l.j 1b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) l.nop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) .previous
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) .section __ex_table, "a"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) .long 8b, 99b // read fault
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) .long 9b, 99b // write fault
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) .previous
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * unsigned long clear_user(void *addr, unsigned long size) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * NOTE: it returns number of bytes NOT cleared !!!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) .global __clear_user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) __clear_user:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) l.addi r1,r1,-8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) l.sw 0(r1),r4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) l.sw 4(r1),r3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 2: l.sfeq r4,r0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) l.bf 1f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) l.addi r4,r4,-1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 9: l.sb 0(r3),r0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) l.j 2b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) l.addi r3,r3,1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) l.addi r11,r4,1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) l.lwz r4,0(r1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) l.lwz r3,4(r1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) l.jr r9
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) l.addi r1,r1,8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) .section .fixup, "ax"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) 99:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) l.j 1b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) l.nop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) .previous
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) .section __ex_table, "a"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) .long 9b, 99b // write fault
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) .previous
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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