stret.s revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1987 Sun Microsystems, Inc.
*/
#ident "%Z%%M% %I% %E% SMI"
.file "stret.s"
#include <sys/asm_linkage.h>
#define FROM %o0
#define SIZE %o1
#define TO %i0
#define MEMWORD %o3 /* use o-registers as temps */
#define TEMP %o4
#define TEMP2 %o5
#define UNIMP 0
#define MASK 0x00000fff
#define STRUCT_VAL_OFF (16*4)
#if STRET4
# define BYTES_PER_MOVE 4
# define LD ld
# define ST st
ENTRY2(.stret4,.stret8)
#endif
#if STRET2
# define BYTES_PER_MOVE 2
# define LD lduh
# define ST sth
ENTRY(.stret2)
#endif
#if STRET1
# define BYTES_PER_MOVE 1
# define LD ldub
# define ST stb
ENTRY(.stret1)
#endif
/*
* see if key matches: if not,
* structure value not expected,
* so just return
*/
ld [%i7+8],MEMWORD
and SIZE,MASK,TEMP
sethi %hi(UNIMP),TEMP2
or TEMP,TEMP2,TEMP2
cmp TEMP2,MEMWORD
bne .LE12
.empty
/*
* set expected return value
*/
.L14:
ld [%fp+STRUCT_VAL_OFF],TO /* (DELAY SLOT) */
/*
* copy the struct using the same loop the compiler does
* for large structure assignment
*/
.L15:
subcc SIZE,BYTES_PER_MOVE,SIZE
LD [FROM+SIZE],TEMP
bg .L15
ST TEMP,[TO+SIZE] /* (DELAY SLOT) */
/* bump return address */
add %i7,0x4,%i7
.LE12:
jmp %i7+8
restore
#if STRET4
SET_SIZE(.stret4)
SET_SIZE(.stret8)
#endif
#if STRET2
SET_SIZE(.stret2)
#endif
#if STRET1
SET_SIZE(.stret1)
#endif