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/*
 * linux/arch/arm/lib/string.S
 *
 * Copyright (C) 1995, 1996 Russell King
 */

#include <asm/assembler.h>
                .text
# Prototype: char *strrchr(const char *s,char c);

@ r0 = pointer, r1 = length
                .global _memzero,memzero
memzero:
_memzero:       stmfd   sp!, {lr}
                mov     r2, #0
                mov     r3, #0
                mov     ip, #0
                mov     lr, #0
Lgfpmemzerolp:  subs    r1, r1, #4*8
                stmgeia r0!, {r2, r3, ip, lr}
                stmgeia r0!, {r2, r3, ip, lr}
                bgt     Lgfpmemzerolp
                LOADREGS(fd, sp!, {pc})

                .global ___page_memcpy,__page_memcpy
__page_memcpy:
___page_memcpy: stmfd   sp!, {r4, r5, lr}
Lpagememcpylp:  subs    r2, r2, #4*8
                ldmgeia r1!, {r3, r4, r5, ip}
                stmgeia r0!, {r3, r4, r5, ip}
                ldmgeia r1!, {r3, r4, r5, ip}
                stmgeia r0!, {r3, r4, r5, ip}
                bgt     Lpagememcpylp
                LOADREGS(fd, sp!, {r4, r5, pc})

                .global _memset,memset
memset:
_memset:        mov     r3, r0
                cmp     r2, #16
                blt     Lmemsetbytelp
                ands    ip, r3, #3
                beq     Laligned
                cmp     ip, #2
                strltb  r1, [r3], #1                    @ Align destination
                strleb  r1, [r3], #1
                strb    r1, [r3], #1
                rsb     ip, ip, #4
                sub     r2, r2, ip
Laligned:       orr     r1, r1, r1, lsl #8
                orr     r1, r1, r1, lsl #16
                cmp     r2, #256
                blt     Lmemsetnotopt1
                stmfd   sp!, {r4, r5, lr}
                mov     r4, r1
                mov     r5, r1
                mov     lr, r1
                mov     ip, r2, lsr #6
                sub     r2, r2, ip, lsl #6
Lmemset64lp1:   stmia   r3!, {r1, r4, r5, lr}           @ 64 bytes at a time.
                stmia   r3!, {r1, r4, r5, lr}
                stmia   r3!, {r1, r4, r5, lr}
                stmia   r3!, {r1, r4, r5, lr}
                subs    ip, ip, #1
                bne     Lmemset64lp1
                teq     r2, #0
                LOADREGS(eqfd, sp!, {r4, r5, pc})       @ Now <64 bytes to go.
                tst     r2, #32
                stmneia r3!, {r1, r4, r5, lr}
                stmneia r3!, {r1, r4, r5, lr}
                tst     r2, #16
                stmneia r3!, {r1, r4, r5, lr}
                ldmia   sp!, {r4, r5}
Lmemsetexit:    tst     r2, #8
                stmneia r3!, {r1, lr}
                tst     r2, #4
                strne   r1, [r3], #4
                tst     r2, #2
                strneb  r1, [r3], #1
                strneb  r1, [r3], #1
                tst     r2, #1
                strneb  r1, [r3], #1
                LOADREGS(fd, sp!, {pc})

Lmemsetnotopt1: movs    ip, r2, lsr #3
                beq     Lmemsetexit
                sub     r2, r2, ip, lsl #3
                stmfd   sp!, {lr}
                mov     lr, r1
                subs    ip, ip, #4
Lmemset1616lp:  stmgeia r3!, {r1, lr}
                stmgeia r3!, {r1, lr}
                stmgeia r3!, {r1, lr}
                stmgeia r3!, {r1, lr}
                subges  ip, ip, #4
                bge     Lmemset1616lp
                tst     ip, #2
                stmneia r3!, {r1, lr}
                stmneia r3!, {r1, lr}
                tst     ip, #1
                stmneia r3!, {r1, lr}
                teq     r2, #0
                LOADREGS(eqfd, sp!, {pc})
                b       Lmemsetexit

Lmemsetbytelp:
Lmemsetlp:      subs    r2, r2, #1
                strgeb  r1, [r3], #1
                bgt     Lmemsetlp
                RETINSTR(mov, pc, lr)

                .global _strrchr,strrchr
strrchr:
_strrchr:       stmfd   sp!,{lr}
                mov     r3,#0
Lstrrchrlp:     ldrb    r2,[r0],#1
                teq     r2,r1
                moveq   r3,r0
                teq     r2,#0
                bne     Lstrrchrlp
                mov     r0,r3
                LOADREGS(fd, sp!, {pc})