1/*******************************************************************************
2 *
3 * Copyright (c) 1993 Intel Corporation
4 *
5 * Intel hereby grants you permission to copy, modify, and distribute this
6 * software and its documentation.  Intel grants this permission provided
7 * that the above copyright notice appears in all copies and that both the
8 * copyright notice and this permission notice appear in supporting
9 * documentation.  In addition, Intel grants this permission provided that
10 * you prominently mark as "not part of the original" any modifications
11 * made to this software or documentation, and that the name of Intel
12 * Corporation not be used in advertising or publicity pertaining to
13 * distribution of the software or the documentation without specific,
14 * written prior permission.
15 *
16 * Intel Corporation provides this AS IS, WITHOUT ANY WARRANTY, EXPRESS OR
17 * IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY
18 * OR FITNESS FOR A PARTICULAR PURPOSE.  Intel makes no guarantee or
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20 * the software and documentation in terms of correctness, accuracy,
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22 * documentation and results solely at your own risk.
23 *
24 * IN NO EVENT SHALL INTEL BE LIABLE FOR ANY LOSS OF USE, LOSS OF BUSINESS,
25 * LOSS OF PROFITS, INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES
26 * OF ANY KIND.  IN NO EVENT SHALL INTEL'S TOTAL LIABILITY EXCEED THE SUM
27 * PAID TO INTEL FOR THE PRODUCT LICENSED HEREUNDER.
28 *
29 ******************************************************************************/
30
31#include <picolibc.h>
32
33	.file "memset.s"
34#ifdef	__PIC
35	.pic
36#endif
37#ifdef	__PID
38	.pid
39#endif
40/*
41 * (c) copyright 1989,1993 Intel Corp., all rights reserved
42 */
43
44/*
45	procedure memset  (optimized assembler version: 80960K series, 80960CA)
46
47	dest_addr = memset (dest_addr, char, len)
48
49	Fill len bytes pointed to by dest_addr with the value of char.
50        Return the original address of dest_addr.
51
52        This program avoids performing unaligned accesses.  It stores
53        from zero to seven bytes, and then stores aligned longwords,
54        and then stores from zero to seven bytes, as necessary to
55        store len bytes starting at dest_addr.
56
57	At the time of this writing, only g0 thru g7 and g13 are available
58	for use in this leafproc;  other registers would have to be saved and
59	restored.  These nine registers, plus tricky use of g14 are sufficient
60	to implement the routine.
61*/
62
63	.globl	_memset
64	.globl	__memset
65	.leafproc	_memset, __memset
66	.align	2
67_memset:
68#ifndef __PIC
69	lda 	Lrett,g14
70#else
71	lda 	Lrett-(.+8)(ip),g14
72#endif
73__memset:
74	cmpo	7,g2		# are there fewer than seven characters to move?
75	 lda	(g14),g13	# save return address
76	notand	g0,7,g3		# test for non-aligned dest_ptr
77	 lda	0,g14		# conform to register conventions
78	shlo	24,g1,g4	# prepare word of char
79	 lda	(g0),g6		# preserve dest_ptr for return
80	shro	8,g4,g5
81	 bge.f	Lcloop_setup
82	cmpo	g3,g0		# is dest longword aligned
83	 lda	7(g3),g3	# bump dest_ptr to next longword boundary
84	or	g4,g5,g4
85	 be.t	Lwloop_setup
86
87Lbgn_cloop:
88	cmpo	g6,g3		# Have we reached longword boundary?
89	 stob	g1,(g6)		# store one byte of char
90	subo	1,g2,g2		# decrement len
91	 lda	1(g6),g6	# increment dest_ptr
92	bne.t	Lbgn_cloop	# loop if more bytes to store before longword
93
94	cmpobge.f 7,g2,Lcloop
95
96Lwloop_setup:
97	shro	16,g4,g5
98	or	g4,g5,g4
99	mov	g4,g5		# now have a longword of char
100
101Lwloop:
102	cmpo	15,g2		# Do we have to store more longwords?
103	 stl	g4,(g6)		# Store longword of char
104	subo	8,g2,g2		# Decrement len
105	 lda	8(g6),g6	# Increment dest_ptr
106	bl.t	Lwloop		# loop if more longwords to store
107
108Lcloop_setup:
109	cmpobge.t 0,g2,Lexit
110
111Lcloop:
112	cmpo	1,g2		# Is len exhausted?
113	 stob	g1,(g6)		# Store byte
114	subo	1,g2,g2		# Decrement len
115	 lda	1(g6),g6	# Increment dest_ptr
116	bne.t	Lcloop		# loop if more bytes to store
117
118Lexit:
119	bx	(g13)
120Lrett:
121	ret
122
123/* end of memset */
124