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-rw-r--r--arch/mn10300/lib/memset.S121
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diff --git a/arch/mn10300/lib/memset.S b/arch/mn10300/lib/memset.S
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--- a/arch/mn10300/lib/memset.S
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-/* Optimised simple memory fill
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
-#include <asm/cache.h>
-
- .section .text
- .balign L1_CACHE_BYTES
-
-###############################################################################
-#
-# void *memset(void *dst, int c, size_t n)
-#
-###############################################################################
- .globl memset
- .type memset,@function
-memset:
- movm [d2,d3],(sp)
- mov d0,(12,sp)
- mov d1,(16,sp)
- mov (20,sp),d2 # count
- mov d0,a0 # dst
- mov d0,e3 # the return value
-
- cmp +0,d2
- beq memset_done # return if zero-length fill
-
- # see if the region parameters are four-byte aligned
- or d0,d2,d3
- and +3,d3
- bne memset_1 # jump if not
-
- extbu d1
- mov_asl d1,d3,8,d1
- or_asl d1,d3,8,d1
- or_asl d1,d3,8,d1
- or d3,d1
-
- # we want to transfer as much as we can in chunks of 32 bytes
- cmp +31,d2
- bls memset_4_remainder # 4-byte aligned remainder
-
- add -32,d2
- mov +32,d3
-
-memset_4_loop:
- mov d1,(a0+)
- mov d1,(a0+)
- mov d1,(a0+)
- mov d1,(a0+)
- mov d1,(a0+)
- mov d1,(a0+)
- mov d1,(a0+)
- mov d1,(a0+)
-
- sub d3,d2
- bcc memset_4_loop
-
- add d3,d2
- beq memset_4_no_remainder
-
-memset_4_remainder:
- # cut 4-7 words down to 0-3
- cmp +16,d2
- bcs memset_4_three_or_fewer_words
- mov d1,(a0+)
- mov d1,(a0+)
- mov d1,(a0+)
- mov d1,(a0+)
- add -16,d2
- beq memset_4_no_remainder
-
- # copy the remaining 1, 2 or 3 words
-memset_4_three_or_fewer_words:
- cmp +8,d2
- bcs memset_4_one_word
- beq memset_4_two_words
- mov d1,(a0+)
-memset_4_two_words:
- mov d1,(a0+)
-memset_4_one_word:
- mov d1,(a0+)
-
-memset_4_no_remainder:
- # check we set the correct amount
- # TODO: REMOVE CHECK
- sub e3,a0,d2
- mov (20,sp),d1
- cmp d2,d1
- beq memset_done
- break
- break
- break
-
-memset_done:
- mov e3,a0
- ret [d2,d3],8
-
- # handle misaligned copying
-memset_1:
- add -1,d2
- mov +1,d3
- setlb # setlb requires the next insns
- # to occupy exactly 4 bytes
-
- sub d3,d2
- movbu d1,(a0)
- inc a0
- lcc
-
- mov e3,a0
- ret [d2,d3],8
-
-memset_end:
- .size memset, memset_end-memset