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Diffstat (limited to 'arch/mn10300/lib/memmove.S')
-rw-r--r-- | arch/mn10300/lib/memmove.S | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/arch/mn10300/lib/memmove.S b/arch/mn10300/lib/memmove.S deleted file mode 100644 index 20b07b62b77c..000000000000 --- a/arch/mn10300/lib/memmove.S +++ /dev/null @@ -1,160 +0,0 @@ -/* MN10300 Optimised simple memory to memory copy, with support for overlapping - * regions - * - * 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 *memmove(void *dst, const void *src, size_t n) -# -############################################################################### - .globl memmove - .type memmove,@function -memmove: - # fall back to memcpy if dst < src to work bottom up - cmp d1,d0 - bcs memmove_memcpy - - # work top down - movm [d2,d3],(sp) - mov d0,(12,sp) - mov d1,(16,sp) - mov (20,sp),d2 # count - add d0,d2,a0 # dst end - add d1,d2,a1 # src end - mov d0,e3 # the return value - - cmp +0,d2 - beq memmove_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 memmove_1 # jump if not - - # we want to transfer as much as we can in chunks of 32 bytes - add -4,a1 - cmp +31,d2 - bls memmove_4_remainder # 4-byte aligned remainder - - add -32,d2 - mov +32,d3 - -memmove_4_loop: - mov (a1),d0 - sub_sub +4,a1,+4,a0 - mov d0,(a0) - mov (a1),d1 - sub_sub +4,a1,+4,a0 - mov d1,(a0) - - mov (a1),d0 - sub_sub +4,a1,+4,a0 - mov d0,(a0) - mov (a1),d1 - sub_sub +4,a1,+4,a0 - mov d1,(a0) - - mov (a1),d0 - sub_sub +4,a1,+4,a0 - mov d0,(a0) - mov (a1),d1 - sub_sub +4,a1,+4,a0 - mov d1,(a0) - - mov (a1),d0 - sub_sub +4,a1,+4,a0 - mov d0,(a0) - mov (a1),d1 - sub_sub +4,a1,+4,a0 - mov d1,(a0) - - sub d3,d2 - bcc memmove_4_loop - - add d3,d2 - beq memmove_4_no_remainder - -memmove_4_remainder: - # cut 4-7 words down to 0-3 - cmp +16,d2 - bcs memmove_4_three_or_fewer_words - mov (a1),d0 - sub_sub +4,a1,+4,a0 - mov d0,(a0) - mov (a1),d1 - sub_sub +4,a1,+4,a0 - mov d1,(a0) - mov (a1),e0 - sub_sub +4,a1,+4,a0 - mov e0,(a0) - mov (a1),e1 - sub_sub +4,a1,+4,a0 - mov e1,(a0) - add -16,d2 - beq memmove_4_no_remainder - - # copy the remaining 1, 2 or 3 words -memmove_4_three_or_fewer_words: - cmp +8,d2 - bcs memmove_4_one_word - beq memmove_4_two_words - mov (a1),d0 - sub_sub +4,a1,+4,a0 - mov d0,(a0) -memmove_4_two_words: - mov (a1),d0 - sub_sub +4,a1,+4,a0 - mov d0,(a0) -memmove_4_one_word: - mov (a1),d0 - sub_sub +4,a1,+4,a0 - mov d0,(a0) - -memmove_4_no_remainder: - # check we copied the correct amount - # TODO: REMOVE CHECK - sub e3,a0,d2 - beq memmove_done - break - break - break - -memmove_done: - mov e3,a0 - ret [d2,d3],8 - - # handle misaligned copying -memmove_1: - add -1,a1 - add -1,d2 - mov +1,d3 - setlb # setlb requires the next insns - # to occupy exactly 4 bytes - - sub d3,d2 - movbu (a1),d0 - sub_sub d3,a1,d3,a0 - movbu d0,(a0) - lcc - - mov e3,a0 - ret [d2,d3],8 - -memmove_memcpy: - jmp memcpy - -memmove_end: - .size memmove, memmove_end-memmove |