c2546d3187
This fixes the sgt-mines plugin. Same issue was present in an old glibc as well: https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=a7ed1adbecb6aac49af75aae3b3498798cf63abc
99 lines
3.2 KiB
ArmAsm
99 lines
3.2 KiB
ArmAsm
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2006 by Thom Johansen
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
#include "config.h"
|
|
|
|
.section .icode,"ax",%progbits
|
|
|
|
.align 2
|
|
|
|
/* The following code is based on code found in Linux kernel version 2.6.15.3
|
|
* linux/arch/arm/lib/memset.S
|
|
*
|
|
* Copyright (C) 1995-2000 Russell King
|
|
*/
|
|
|
|
/* This code will align a pointer for memset, if needed */
|
|
1: cmp r2, #4 @ 1 do we have enough
|
|
blt 5f @ 1 bytes to align with?
|
|
cmp r3, #2 @ 1
|
|
strgtb r1, [r0, #-1]! @ 1
|
|
strgeb r1, [r0, #-1]! @ 1
|
|
strb r1, [r0, #-1]! @ 1
|
|
sub r2, r2, r3 @ 1 r2 = r2 - r3
|
|
b 2f
|
|
|
|
.global memset
|
|
.type memset,%function
|
|
memset:
|
|
add r0, r0, r2 @ we'll write backwards in memory
|
|
ands r3, r0, #3 @ 1 unaligned?
|
|
bne 1b @ 1
|
|
2:
|
|
/*
|
|
* we know that the pointer in r0 is aligned to a word boundary.
|
|
*/
|
|
and r1, r1, #255 @ clear sign bits
|
|
orr r1, r1, r1, lsl #8
|
|
orr r1, r1, r1, lsl #16
|
|
mov r3, r1
|
|
cmp r2, #16
|
|
blt 5f
|
|
/*
|
|
* We need an extra register for this loop - save the return address and
|
|
* use the LR
|
|
*/
|
|
str lr, [sp, #-4]!
|
|
mov ip, r1
|
|
mov lr, r1
|
|
|
|
3: subs r2, r2, #64
|
|
stmgedb r0!, {r1, r3, ip, lr} @ 64 bytes at a time.
|
|
stmgedb r0!, {r1, r3, ip, lr}
|
|
stmgedb r0!, {r1, r3, ip, lr}
|
|
stmgedb r0!, {r1, r3, ip, lr}
|
|
bgt 3b
|
|
ldrpc cond=eq @ Now <64 bytes to go.
|
|
/*
|
|
* No need to correct the count; we're only testing bits from now on
|
|
*/
|
|
tst r2, #32
|
|
stmnedb r0!, {r1, r3, ip, lr}
|
|
stmnedb r0!, {r1, r3, ip, lr}
|
|
tst r2, #16
|
|
stmnedb r0!, {r1, r3, ip, lr}
|
|
ldr lr, [sp], #4
|
|
|
|
5: tst r2, #8
|
|
stmnedb r0!, {r1, r3}
|
|
tst r2, #4
|
|
strne r1, [r0, #-4]!
|
|
/*
|
|
* When we get here, we've got less than 4 bytes to zero. We
|
|
* may have an unaligned pointer as well.
|
|
*/
|
|
6: tst r2, #2
|
|
strneb r1, [r0, #-1]!
|
|
strneb r1, [r0, #-1]!
|
|
tst r2, #1
|
|
strneb r1, [r0, #-1]!
|
|
bx lr
|
|
.end:
|
|
.size memset,.end-memset
|