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rtld_start.S revision 1.4 
      1 /*	$NetBSD: rtld_start.S,v 1.4 1999/03/01 14:40:32 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas and Paul Kranenburg.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <machine/asm.h>
     40 
     41 	.section	".text"
     42 	.align	4
     43 	.global	_rtld_start
     44 	.type	_rtld_start,@function
     45 _rtld_start:
     46 	mov	0, %fp			/* Erect a fence post for ourselves */
     47 	mov	%g1, %l1		/* save ps_strings */
     48 	sub	%sp, 8, %sp		/* Make room for return args */
     49 
     50 	call	_rtld
     51 	 add	%sp, 64, %o0		/* &argc - 8 */
     52 
     53 	ld	[%sp + 64], %g3		/* arg: cleanup */
     54 	ld	[%sp + 64 + 4], %g2	/* arg: obj */
     55 	add	%sp, 8, %sp		/* restore stack pointer */
     56 
     57 	jmp	%o0
     58 	 mov	%l1, %g1		/* restore ps_strings */
     59 
     60 
     61 	.section	".text"
     62 	.align	4
     63 	.global	_rtld_bind_start
     64 	.type	_rtld_bind_start,@function
     65 _rtld_bind_start:	# (obj, reloff)
     66 	save	%sp, -96, %sp		/* setup standard stack frame */
     67 	ld	[%i7 + 8], %o0		/* obj id is in second PLT slot */
     68 	srl	%g1, 10, %o1		/* offset is in high 22 bits */
     69 	call	_rtld_bind		/* Call _rtld_bind(obj, offset) */
     70 	 sub	%o1, 12*4, %o1		/* first 4 `pltrel' entries missing! */
     71 
     72 	mov	%o0, %g1		/* return value == function address */
     73 	restore				/* get rid of our context */
     74 	 jmp	%g1			/* and the jmpslot context, then go. */
     75 	restore
     76 
     77