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255 lines
3.9 KiB
255 lines
3.9 KiB
20 years ago
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/* $Id: memmove.S,v 1.2 2001/07/27 11:51:09 gniibe Exp $
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*
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* "memmove" implementation of SuperH
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*
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* Copyright (C) 1999 Niibe Yutaka
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*
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*/
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/*
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* void *memmove(void *dst, const void *src, size_t n);
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* The memory areas may overlap.
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*/
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#include <linux/linkage.h>
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ENTRY(memmove)
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! if dest > src, call memcpy (it copies in decreasing order)
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cmp/hi r5,r4
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bf 1f
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mov.l 2f,r0
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jmp @r0
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nop
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.balign 4
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2: .long memcpy
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1:
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sub r5,r4 ! From here, r4 has the distance to r0
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tst r6,r6
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bt/s 9f ! if n=0, do nothing
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mov r5,r0
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add r6,r5
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mov #12,r1
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cmp/gt r6,r1
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bt/s 8f ! if it's too small, copy a byte at once
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add #-1,r4
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add #1,r4
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!
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! [ ... ] DST [ ... ] SRC
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! [ ... ] [ ... ]
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! : :
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! r0+r4--> [ ... ] r0 --> [ ... ]
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! : :
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! [ ... ] [ ... ]
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! r5 -->
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!
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mov r4,r1
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mov #3,r2
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and r2,r1
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shll2 r1
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mov r0,r3 ! Save the value on R0 to R3
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mova jmptable,r0
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add r1,r0
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mov.l @r0,r1
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jmp @r1
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mov r3,r0 ! and back to R0
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.balign 4
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jmptable:
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.long case0
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.long case1
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.long case2
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.long case3
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! copy a byte at once
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8: mov.b @r0+,r1
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cmp/hs r5,r0
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bf/s 8b ! while (r0<r5)
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mov.b r1,@(r0,r4)
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add #1,r4
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9:
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add r4,r0
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rts
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sub r6,r0
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case_none:
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bra 8b
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add #-1,r4
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case0:
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!
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! GHIJ KLMN OPQR --> GHIJ KLMN OPQR
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!
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! First, align to long word boundary
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mov r0,r3
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and r2,r3
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tst r3,r3
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bt/s 2f
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add #-1,r4
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mov #4,r2
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sub r3,r2
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1: dt r2
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mov.b @r0+,r1
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bf/s 1b
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mov.b r1,@(r0,r4)
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!
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2: ! Second, copy a long word at once
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add #-3,r4
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add #-3,r5
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3: mov.l @r0+,r1
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cmp/hs r5,r0
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bf/s 3b
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mov.l r1,@(r0,r4)
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add #3,r5
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!
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! Third, copy a byte at once, if necessary
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cmp/eq r5,r0
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bt/s 9b
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add #4,r4
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bra 8b
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add #-1,r4
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case3:
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!
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! GHIJ KLMN OPQR --> ...G HIJK LMNO PQR.
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!
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! First, align to long word boundary
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mov r0,r3
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and r2,r3
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tst r3,r3
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bt/s 2f
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add #-1,r4
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mov #4,r2
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sub r3,r2
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1: dt r2
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mov.b @r0+,r1
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bf/s 1b
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mov.b r1,@(r0,r4)
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!
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2: ! Second, read a long word and write a long word at once
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add #-2,r4
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mov.l @(r0,r4),r1
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add #-7,r5
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add #-4,r4
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!
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#ifdef __LITTLE_ENDIAN__
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shll8 r1
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3: mov r1,r3 ! JIHG
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shlr8 r3 ! xJIH
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mov.l @r0+,r1 ! NMLK
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mov r1,r2
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shll16 r2
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shll8 r2 ! Kxxx
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or r2,r3 ! KJIH
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cmp/hs r5,r0
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bf/s 3b
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mov.l r3,@(r0,r4)
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#else
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shlr8 r1
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3: mov r1,r3 ! GHIJ
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shll8 r3 ! HIJx
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mov.l @r0+,r1 ! KLMN
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mov r1,r2
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shlr16 r2
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shlr8 r2 ! xxxK
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or r2,r3 ! HIJK
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cmp/hs r5,r0
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bf/s 3b
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mov.l r3,@(r0,r4)
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#endif
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add #7,r5
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!
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! Third, copy a byte at once, if necessary
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cmp/eq r5,r0
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bt/s 9b
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add #7,r4
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add #-3,r0
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bra 8b
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add #-1,r4
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case2:
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!
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! GHIJ KLMN OPQR --> ..GH IJKL MNOP QR..
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!
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! First, align to word boundary
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tst #1,r0
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bt/s 2f
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add #-1,r4
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mov.b @r0+,r1
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mov.b r1,@(r0,r4)
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!
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2: ! Second, read a word and write a word at once
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add #-1,r4
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add #-1,r5
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!
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3: mov.w @r0+,r1
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cmp/hs r5,r0
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bf/s 3b
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mov.w r1,@(r0,r4)
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add #1,r5
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!
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! Third, copy a byte at once, if necessary
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cmp/eq r5,r0
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bt/s 9b
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add #2,r4
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mov.b @r0,r1
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mov.b r1,@(r0,r4)
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bra 9b
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add #1,r0
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case1:
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!
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! GHIJ KLMN OPQR --> .GHI JKLM NOPQ R...
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!
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! First, align to long word boundary
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mov r0,r3
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and r2,r3
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tst r3,r3
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bt/s 2f
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add #-1,r4
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mov #4,r2
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sub r3,r2
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1: dt r2
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mov.b @r0+,r1
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bf/s 1b
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mov.b r1,@(r0,r4)
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!
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2: ! Second, read a long word and write a long word at once
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mov.l @(r0,r4),r1
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add #-7,r5
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add #-4,r4
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!
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#ifdef __LITTLE_ENDIAN__
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shll16 r1
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shll8 r1
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3: mov r1,r3 ! JIHG
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shlr16 r3
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shlr8 r3 ! xxxJ
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mov.l @r0+,r1 ! NMLK
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mov r1,r2
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shll8 r2 ! MLKx
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or r2,r3 ! MLKJ
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cmp/hs r5,r0
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bf/s 3b
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mov.l r3,@(r0,r4)
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#else
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shlr16 r1
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shlr8 r1
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3: mov r1,r3 ! GHIJ
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shll16 r3
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shll8 r3 ! Jxxx
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mov.l @r0+,r1 ! KLMN
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mov r1,r2
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shlr8 r2 ! xKLM
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or r2,r3 ! JKLM
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cmp/hs r5,r0
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bf/s 3b ! while(r0<r5)
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mov.l r3,@(r0,r4)
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#endif
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add #7,r5
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!
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! Third, copy a byte at once, if necessary
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cmp/eq r5,r0
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bt/s 9b
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add #5,r4
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add #-3,r0
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bra 8b
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add #-1,r4
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