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https://github.com/autc04/Retro68.git
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136 lines
1.9 KiB
ArmAsm
136 lines
1.9 KiB
ArmAsm
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/*
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* memset 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 *memset(void *buffer, int value, size_t length);
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*/
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name "memset.S"
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.text
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even
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global _memset
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_memset:
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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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ld r5,rr14(#8)
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ldl rr2,rr14(#10)
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#else
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pushl @rr14,rr6
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#endif
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/* rr2 - length
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* rl5 - value
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* rr6 - buffer
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*/
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testl rr2
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jr z,finish
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ldb rh5,rl5
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ld r1,r5 /* r1 contains value */
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bit r7,#0
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jr z,not_odd
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ldb @rr6,rl1
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inc r7,#1
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subl rr2,#1
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jr z,finish
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not_odd:ld r0,r3 /* remember length */
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srl r3,#1
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jr z,no_words
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ldl rr4,rr6
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ld @rr6,r1
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inc r7,#2
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dec r3,#1
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jr z,no_words
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ldir @rr6,@rr4,r3 /* fill words */
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no_words:
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bit r0,#0 /* one byte remaining? */
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jr z,finish
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ldb @rr6,rl1
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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 - value
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* r7 - buffer
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*/
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test r5
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jr z,finish
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ldb rh6,rl6
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ld r1,r6 /* r1 contains value */
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bit r7,#0
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jr z,not_odd
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ldb @r7,rl1
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inc r7,#1
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dec r5,#1
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jr z,finish
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not_odd:ld r0,r5 /* remember length */
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srl r5,#1
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jr z,no_words
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ld r4,r7
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ld @r7,r1
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inc r7,#2
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dec r5,#1
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jr z,no_words
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ldir @r7,@r4,r5 /* fill words */
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no_words:
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bit r0,#0 /* one byte remaining? */
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jr z,finish
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ldb @r7,rl1
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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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