| /* |
| * memset routine for Z8000 |
| * Copyright (C) 2004 Christian Groessler <chris@groessler.org> |
| * |
| * Permission to use, copy, modify, and distribute this file |
| * for any purpose is hereby granted without fee, provided that |
| * the above copyright notice and this notice appears in all |
| * copies. |
| * |
| * This file is distributed WITHOUT ANY WARRANTY; without even the implied |
| * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| */ |
| |
| /* void *memset(void *buffer, int value, size_t length); |
| */ |
| |
| name "memset.S" |
| |
| .text |
| even |
| global _memset |
| |
| _memset: |
| |
| #ifdef __Z8001__ |
| segm |
| |
| #ifdef __STD_CALL__ |
| ldl rr6,rr14(#4) |
| ld r5,rr14(#8) |
| ldl rr2,rr14(#10) |
| #else |
| pushl @rr14,rr6 |
| #endif |
| |
| /* rr2 - length |
| * rl5 - value |
| * rr6 - buffer |
| */ |
| testl rr2 |
| jr z,finish |
| |
| ldb rh5,rl5 |
| ld r1,r5 /* r1 contains value */ |
| bit r7,#0 |
| jr z,not_odd |
| |
| ldb @rr6,rl1 |
| inc r7,#1 |
| subl rr2,#1 |
| jr z,finish |
| |
| not_odd:ld r0,r3 /* remember length */ |
| srl r3,#1 |
| jr z,no_words |
| |
| ldl rr4,rr6 |
| ld @rr6,r1 |
| inc r7,#2 |
| dec r3,#1 |
| jr z,no_words |
| |
| ldir @rr6,@rr4,r3 /* fill words */ |
| |
| no_words: |
| bit r0,#0 /* one byte remaining? */ |
| jr z,finish |
| |
| ldb @rr6,rl1 |
| |
| finish: |
| #ifdef __STD_CALL__ |
| ldl rr6,rr14(#4) |
| #else |
| popl rr2,@rr14 |
| #endif |
| |
| |
| #else /* above Z8001, below Z8002 */ |
| |
| |
| unsegm |
| |
| #ifdef __STD_CALL__ |
| ld r7,r15(#2) |
| ld r6,r15(#4) |
| ld r5,r15(#6) |
| #else |
| ld r2,r7 /* buffer pointer return value */ |
| #endif |
| |
| /* r5 - length |
| * r6 - value |
| * r7 - buffer |
| */ |
| test r5 |
| jr z,finish |
| |
| ldb rh6,rl6 |
| ld r1,r6 /* r1 contains value */ |
| bit r7,#0 |
| jr z,not_odd |
| |
| ldb @r7,rl1 |
| inc r7,#1 |
| dec r5,#1 |
| jr z,finish |
| |
| not_odd:ld r0,r5 /* remember length */ |
| srl r5,#1 |
| jr z,no_words |
| |
| ld r4,r7 |
| ld @r7,r1 |
| inc r7,#2 |
| dec r5,#1 |
| jr z,no_words |
| |
| ldir @r7,@r4,r5 /* fill words */ |
| |
| no_words: |
| bit r0,#0 /* one byte remaining? */ |
| jr z,finish |
| |
| ldb @r7,rl1 |
| |
| finish: |
| #ifdef __STD_CALL__ |
| ld r7,r15(#2) |
| #endif |
| |
| #endif /* Z8002 */ |
| |
| ret |
| .end |
