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rtld_start.S revision 1.5 
      1 /*	$NetBSD: rtld_start.S,v 1.5 2002/09/12 17:08:32 mycroft Exp $	*/
      2 
      3 /*
      4  * Copyright 1997 Michael L. Hitch <mhitch (at) montana.edu>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include <mips/asm.h>
     31 
     32 .globl _C_LABEL(_rtld_relocate_nonplt_self)
     33 .globl _C_LABEL(_rtld)
     34 
     35 LEAF(rtld_start)
     36 	.set	noreorder
     37 
     38 	.cpload t9
     39 	addu	sp, sp, -12		# adjust stack pointer
     40 	.cprestore 0			# -> 0(sp) for gp
     41 					# -> 4(sp) for atexit
     42 					# -> 8(sp) for obj_main
     43 	move	s0,a0			# save stack pointer from a0
     44 	move	s1,a3			# save ps_strings pointer
     45 
     46 	la	a1, 1f
     47 	bal	1f
     48 	 la	t9,_C_LABEL(_rtld_relocate_nonplt_self)
     49 1:	subu	a1, ra, a1		# relocbase
     50 	move	s2,a1
     51 	la	a0,_DYNAMIC
     52 	addu	t9, a1, t9
     53 	jalr	t9
     54 	 addu	a0, a1, a0		# &_DYNAMIC
     55 
     56 	move	a1,s2			# relocbase
     57 	addu	a0, sp, 4		# sp
     58 	jal	_C_LABEL(_rtld)		# v0 = _rtld(sp, relocbase)
     59 	 nop
     60 
     61 	lw	a1, 4(sp)		# our atexit function
     62 	lw	a2, 8(sp)		# obj_main entry
     63 	addu	sp, sp,12		# readjust stack
     64 	move	a0,s0			# stack pointer
     65 	move	t9,v0
     66 	jr	t9			# _start(sp, cleanup, obj);
     67 	move	a3,s1			# restore ps_strings
     68 
     69 END(rtld_start)
     70 
     71 	.globl	_rtld_bind_start
     72 	.ent	_rtld_bind_start
     73 _rtld_bind_start:
     74 
     75 	move	v1,gp			# save old GP
     76 	add	t9,8			# modify T9 to point at .cpload
     77 	.cpload	t9
     78 	subu	sp,40			# save arguments and sp value in stack
     79 	.cprestore 32
     80 	sw	t7,36(sp)
     81 	sw	a0,12(sp)
     82 	sw	a1,16(sp)
     83 	sw	a2,20(sp)
     84 	sw	a3,24(sp)
     85 	sw	s0,28(sp)
     86 	move	s0,sp
     87 	move	a0,t8			# symbol index
     88 	move	a1,t7			# old RA
     89 	move	a2,v1			# old GP
     90 	move	a3,ra			# current RA
     91 	jal	_C_LABEL(_rtld_bind_mips)
     92 	nop
     93 	move	sp,s0
     94 	lw	ra,36(sp)
     95 	lw	a0,12(sp)
     96 	lw	a1,16(sp)
     97 	lw	a2,20(sp)
     98 	lw	a3,24(sp)
     99 	lw	s0,28(sp)
    100 	addu	sp,40
    101 	move	t9,v0
    102 	jr	t9
    103 	nop
    104 	.end	_rtld_bind_start
    105