/*
 * 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