Home | History | Annotate | Line # | Download | only in sparc 
      1 /*	$NetBSD: rtld_start.S,v 1.16 2008/04/28 20:23:03 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1999, 2002, 2003 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, Paul Kranenburg, and by Charles M. Hannum.
      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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <machine/asm.h>
     33 
     34 	.section	".text"
     35 	.align	4
     36 	.global	_rtld_start
     37 	.type	_rtld_start,@function
     38 _rtld_start:
     39 	mov	0, %fp			/* Erect a fence post for ourselves */
     40 	mov	%g1, %l1		/* save ps_strings */
     41 	sub	%sp, 32+8, %sp		/* room for return args and save area */
     42 
     43 	sethi	%hi(_GLOBAL_OFFSET_TABLE_-4), %l7
     44 	call	0f
     45 	 add	%l7, %lo(_GLOBAL_OFFSET_TABLE_+4), %l7
     46 	call	_DYNAMIC+8
     47 0:	add	%l7, %o7, %l7		/* real &_GLOBAL_OFFSET_TABLE_ */
     48 	ld	[%o7+8], %o0		/* load stub call instruction */
     49 	ld	[%l7], %l0		/* base-relative &_DYNAMIC */
     50 	sll	%o0, 2, %o0		/* extract PC offset */
     51 
     52 	add	%o0, %o7, %o0		/* real &_DYNAMIC */
     53 	sub	%o0, %l0, %l0		/* relocbase */
     54 	call	_rtld_relocate_nonplt_self
     55 	 mov	%l0, %o1		/* relocbase */
     56 
     57 	mov	%l0, %o1		/* relocbase */
     58 	call	_rtld
     59 	 add	%sp, 96, %o0		/* &argc - 8 */
     60 
     61 	ld	[%sp + 96], %g3	/* arg: cleanup */
     62 	ld	[%sp + 96 + 4], %g2	/* arg: obj */
     63 	add	%sp, 32+8, %sp		/* restore stack pointer */
     64 
     65 	jmp	%o0
     66 	 mov	%l1, %g1		/* restore ps_strings */
     67 
     68 
     69 	.section	".text"
     70 	.align	4
     71 	.global	_rtld_bind_start
     72 	.type	_rtld_bind_start,@function
     73 _rtld_bind_start:	# (obj, reloff)
     74 	ld	[%o7 + 8], %o0		/* obj id is in second PLT slot */
     75 	srl	%g1, 10, %o1		/* offset is in high 22 bits */
     76 	call	_rtld_bind		/* Call _rtld_bind(obj, offset) */
     77 	 sub	%o1, 12*4, %o1		/* first 4 `pltrel' entries missing! */
     78 
     79 	jmp	%o0			/* return value == function address */
     80 	 restore
     81 
     82