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Add code for memcpy() and memmove().

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This commit is contained in:
mycroft 1993-12-06 22:12:04 +00:00
parent 565cec3fcc
commit 87a251f506
1 changed files with 20 additions and 1 deletions
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21
lib/libc/arch/m68k/string/bcopy.S
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@ -38,7 +38,7 @@
#if defined(LIBC_SCCS) && !defined(lint)
.text
/*.asciz "from: @(#)bcopy.s 5.1 (Berkeley) 5/12/90"*/
.asciz "$Id: bcopy.S,v 1.1 1993/11/25 23:38:26 paulus Exp $"
.asciz "$Id: bcopy.S,v 1.2 1993/12/06 22:12:04 mycroft Exp $"
#endif /* LIBC_SCCS and not lint */
#include "DEFS.h"
@ -52,11 +52,24 @@
* - longword align when possible (only on the 68020)
* - use nested DBcc instructions or use one and limit size to 64K
*/
#ifdef MEMCOPY
ENTRY(memcpy)
#else
#ifdef MOMMOVE
ENTRY(memmove)
#else
ENTRY(bcopy)
#endif
#endif
movl sp@(12),d1 /* check count */
jle bcdone /* <= 0, don't do anything */
#if defined(MEMCOPY) || defined(MEMMOVE)
movl sp@(4),a1 /* dest address */
movl sp@(8),a0 /* src address */
#else
movl sp@(4),a0 /* src address */
movl sp@(8),a1 /* dest address */
#endif
cmpl a1,a0 /* src after dest? */
jlt bcback /* yes, must copy backwards */
movl a0,d0
@ -83,6 +96,9 @@ bcfbloop:
subql #1,d1 /* adjust count */
jne bcfbloop /* still more, keep going */
bcdone:
#if defined(MEMCOPY) || defined(MEMMOVE)
movl sp@(4),d0 /* dest address */
#endif
rts
bcback:
addl d1,a0 /* src pointer to end */
@ -110,5 +126,8 @@ bcbbloop:
movb a0@-,a1@- /* copy a byte */
subql #1,d1 /* adjust count */
jne bcbbloop /* still more, keep going */
#if defined(MEMCOPY) || defined(MEMMOVE)
movl sp@(4),d0 /* dest address */
#endif
rts