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rtld_start.S revision 1.7 
      1 /*	$NetBSD: rtld_start.S,v 1.7 2002/09/24 21:57:20 mycroft Exp $	*/
      2 
      3 /*
      4  * Copyright 1997 Michael L. Hitch <mhitch (at) montana.edu>
      5  * Portions copyright 2002 Charles M. Hannum.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. The name of the author may not be used to endorse or promote products
     17  *    derived from this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <mips/asm.h>
     32 
     33 .globl _C_LABEL(_rtld_relocate_nonplt_self)
     34 .globl _C_LABEL(_rtld)
     35 
     36 LEAF(rtld_start)
     37 	.set	noreorder
     38 
     39 	.cpload t9
     40 	addu	sp, sp, -12		# adjust stack pointer
     41 	.cprestore 0			# -> 0(sp) for gp
     42 					# -> 4(sp) for atexit
     43 					# -> 8(sp) for obj_main
     44 	move	s0,a0			# save stack pointer from a0
     45 	move	s1,a3			# save ps_strings pointer
     46 
     47 	la	a1, 1f
     48 	bal	1f
     49 	 la	t9,_C_LABEL(_rtld_relocate_nonplt_self)
     50 1:	subu	a1, ra, a1		# relocbase
     51 	move	s2,a1
     52 	la	a0,_DYNAMIC
     53 	addu	t9, a1, t9
     54 	jalr	t9
     55 	 addu	a0, a1, a0		# &_DYNAMIC
     56 
     57 	move	a1,s2			# relocbase
     58 	addu	a0, sp, 4		# sp
     59 	jal	_C_LABEL(_rtld)		# v0 = _rtld(sp, relocbase)
     60 	 nop
     61 
     62 	lw	a1, 4(sp)		# our atexit function
     63 	lw	a2, 8(sp)		# obj_main entry
     64 	addu	sp, sp,12		# readjust stack
     65 	move	a0,s0			# stack pointer
     66 	move	t9,v0
     67 	jr	t9			# _start(sp, cleanup, obj);
     68 	move	a3,s1			# restore ps_strings
     69 
     70 END(rtld_start)
     71 
     72 	.globl	_rtld_bind_start
     73 	.ent	_rtld_bind_start
     74 _rtld_bind_start:
     75 
     76 	move	v1,gp			# save old GP
     77 	add	t9,8			# modify T9 to point at .cpload
     78 	.cpload	t9
     79 	subu	sp,44			# save arguments and sp value in stack
     80 	.cprestore 36
     81 	sw	t7,40(sp)
     82 	sw	a0,16(sp)
     83 	sw	a1,20(sp)
     84 	sw	a2,24(sp)
     85 	sw	a3,28(sp)
     86 	sw	s0,32(sp)
     87 	move	s0,sp
     88 	move	a0,t8			# symbol index
     89 	move	a1,t7			# old RA
     90 	move	a2,v1			# old GP
     91 	move	a3,ra			# current RA
     92 	jal	_C_LABEL(_rtld_bind_mips)
     93 	nop
     94 	move	sp,s0
     95 	lw	ra,40(sp)
     96 	lw	a0,16(sp)
     97 	lw	a1,20(sp)
     98 	lw	a2,24(sp)
     99 	lw	a3,28(sp)
    100 	lw	s0,32(sp)
    101 	addu	sp,44
    102 	move	t9,v0
    103 	jr	t9
    104 	nop
    105 	.end	_rtld_bind_start
    106