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-rw-r--r--arch/mn10300/lib/memcpy.S135
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diff --git a/arch/mn10300/lib/memcpy.S b/arch/mn10300/lib/memcpy.S
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-/* MN10300 Optimised simple memory to memory copy
- *
- * 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 *memcpy(void *dst, const void *src, size_t n)
-#
-###############################################################################
- .globl memcpy
- .type memcpy,@function
-memcpy:
- movm [d2,d3],(sp)
- mov d0,(12,sp)
- mov d1,(16,sp)
- mov (20,sp),d2 # count
- mov d0,a0 # dst
- mov d1,a1 # src
- mov d0,e3 # the return value
-
- cmp +0,d2
- beq memcpy_done # return if zero-length copy
-
- # see if the three parameters are all four-byte aligned
- or d0,d1,d3
- or d2,d3
- and +3,d3
- bne memcpy_1 # jump if not
-
- # we want to transfer as much as we can in chunks of 32 bytes
- cmp +31,d2
- bls memcpy_4_remainder # 4-byte aligned remainder
-
- movm [exreg1],(sp)
- add -32,d2
- mov +32,d3
-
-memcpy_4_loop:
- mov (a1+),d0
- mov (a1+),d1
- mov (a1+),e0
- mov (a1+),e1
- mov (a1+),e4
- mov (a1+),e5
- mov (a1+),e6
- mov (a1+),e7
- mov d0,(a0+)
- mov d1,(a0+)
- mov e0,(a0+)
- mov e1,(a0+)
- mov e4,(a0+)
- mov e5,(a0+)
- mov e6,(a0+)
- mov e7,(a0+)
-
- sub d3,d2
- bcc memcpy_4_loop
-
- movm (sp),[exreg1]
- add d3,d2
- beq memcpy_4_no_remainder
-
-memcpy_4_remainder:
- # cut 4-7 words down to 0-3
- cmp +16,d2
- bcs memcpy_4_three_or_fewer_words
- mov (a1+),d0
- mov (a1+),d1
- mov (a1+),e0
- mov (a1+),e1
- mov d0,(a0+)
- mov d1,(a0+)
- mov e0,(a0+)
- mov e1,(a0+)
- add -16,d2
- beq memcpy_4_no_remainder
-
- # copy the remaining 1, 2 or 3 words
-memcpy_4_three_or_fewer_words:
- cmp +8,d2
- bcs memcpy_4_one_word
- beq memcpy_4_two_words
- mov (a1+),d0
- mov d0,(a0+)
-memcpy_4_two_words:
- mov (a1+),d0
- mov d0,(a0+)
-memcpy_4_one_word:
- mov (a1+),d0
- mov d0,(a0+)
-
-memcpy_4_no_remainder:
- # check we copied the correct amount
- # TODO: REMOVE CHECK
- sub e3,a0,d2
- mov (20,sp),d1
- cmp d2,d1
- beq memcpy_done
- break
- break
- break
-
-memcpy_done:
- mov e3,a0
- ret [d2,d3],8
-
- # handle misaligned copying
-memcpy_1:
- add -1,d2
- mov +1,d3
- setlb # setlb requires the next insns
- # to occupy exactly 4 bytes
-
- sub d3,d2
- movbu (a1),d0
- movbu d0,(a0)
- add_add d3,a1,d3,a0
- lcc
-
- mov e3,a0
- ret [d2,d3],8
-
-memcpy_end:
- .size memcpy, memcpy_end-memcpy