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https://github.com/autc04/Retro68.git
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146 lines
2.4 KiB
ArmAsm
146 lines
2.4 KiB
ArmAsm
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/*
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* memcpy routine for Z8000
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* Copyright (C) 2004 Christian Groessler <chris@groessler.org>
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*
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* Permission to use, copy, modify, and distribute this file
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* for any purpose is hereby granted without fee, provided that
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* the above copyright notice and this notice appears in all
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* copies.
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*
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* This file is distributed WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* void *memcpy(void *dest, const void *src, size_t length);
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*/
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name "memcpy.S"
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.text
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even
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global _memcpy
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global memmove_entry
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_memcpy:
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#ifdef __Z8001__
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segm
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#ifdef __STD_CALL__
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ldl rr6,rr14(#4)
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ldl rr4,rr14(#8)
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ldl rr2,rr14(#12)
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#else
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pushl @rr14,rr6
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#endif
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/* rr2 - length (high word ignored)
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* rr4 - src
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* rr6 - dest
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*/
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testl rr2
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jr z,finish
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memmove_entry: /* external entry point from memmove */
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bitb rl7,#0 /* odd destination address? */
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jr nz,testsrc
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bitb rl5,#0 /* odd source address? */
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jr nz,odd_copy
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jr t,even_copy /* dest even, src odd */
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testsrc:
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bitb rl5,#0
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jr z,odd_copy /* src even, dest odd */
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ldib @rr6,@rr4,r3
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jr ov,finish /* jump if r3 is zero now */
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/* copy words */
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even_copy:
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ld r2,r3 /* remember length */
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srl r3,#1
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jr z,no_words
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ldir @rr6,@rr4,r3
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no_words:
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bitb rl2,#0 /* odd length? */
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jr z,finish
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ldib @rr6,@rr4,r2 /* yes, copy last byte */
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jr finish
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/* copy bytes */
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odd_copy:
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ldirb @rr6,@rr4,r3
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finish:
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#ifdef __STD_CALL__
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ldl rr6,rr14(#4)
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#else
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popl rr2,@rr14
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#endif
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#else /* above Z8001, below Z8002 */
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unsegm
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#ifdef __STD_CALL__
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ld r7,r15(#2)
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ld r6,r15(#4)
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ld r5,r15(#6)
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#else
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ld r2,r7 /* buffer pointer return value */
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#endif
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/* r5 - length
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* r6 - src
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* r7 - dest
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*/
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test r5
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jr z,finish
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memmove_entry: /* external entry point from memmove */
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bitb rl7,#0 /* odd destination address? */
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jr nz,testsrc
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bitb rl6,#0 /* odd source address? */
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jr nz,odd_copy
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jr t,even_copy /* dest even, src odd */
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testsrc:
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bitb rl6,#0
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jr z,odd_copy /* src even, dest odd */
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ldib @r7,@r6,r5
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jr ov,finish /* jump if r5 is zero now */
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/* copy words */
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even_copy:
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ld r4,r5 /* remember length */
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srl r5,#1
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jr z,no_words
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ldir @r7,@r6,r5
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no_words:
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bitb rl4,#0 /* odd length? */
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jr z,finish
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ldib @r7,@r6,r4 /* yes, copy last byte */
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jr finish
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/* copy bytes */
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odd_copy:
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ldirb @r7,@r6,r5
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finish:
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#ifdef __STD_CALL__
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ld r7,r15(#2)
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#endif
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#endif /* Z8002 */
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ret
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.end
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