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rtld_start.S revision 1.9.44.2 
      1 /*	$NetBSD: rtld_start.S,v 1.9.44.2 2009/09/02 15:49:42 matt Exp $	*/
      2 
      3 /*
      4  * Copyright 1997 Michael L. Hitch <mhitch (at) montana.edu>
      5  * Portions copyright 2002 Charles M. Hannum <root (at) ihack.net>
      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 	SETUP_GP
     39 	PTR_SUBU sp, 2*SZREG		# adjust stack pointer
     40 	SETUP_GP64(s4, rtld_start)
     41 	SAVE_GP(s4)
     42 					# -> 0*SZREG(sp) for atexit
     43 					# -> 1*SZREG(sp) for obj_main
     44 	move	s0, a0			# save stack pointer from a0
     45 	move	s3, a3			# save ps_strings pointer
     46 
     47 	PTR_LA	a1, 1f
     48 	bal	1f
     49 	 PTR_LA	t9, _C_LABEL(_rtld_relocate_nonplt_self)
     50 1:	PTR_SUBU a1, ra, a1		# relocbase
     51 	move	s2,a1
     52 	PTR_LA	a0,_DYNAMIC
     53 	PTR_ADDU t9, a1, t9
     54 	jalr	t9			# _rtld_relocate_nonplt_self(dynp, relocabase)
     55 	 PTR_ADDU a0, a1, a0		# &_DYNAMIC
     56 
     57 	move	a1, s2			# relocbase
     58 	move	a0, sp			# sp
     59 	jal	_C_LABEL(_rtld)		# v0 = _rtld(sp, relocbase)
     60 	 nop
     61 
     62 	PTR_L	a1, 0*SZREG(sp)		# our atexit function
     63 	PTR_L	a2, 1*SZREG(sp)		# obj_main entry
     64 	PTR_ADDU sp, 2*SZREG		# readjust stack
     65 	move	a0, s0			# stack pointer
     66 	move	t9, v0
     67 	jr	t9			# _start(sp, cleanup, obj);
     68 	 move	a3, s3			# restore ps_strings
     69 
     70 END(rtld_start)
     71 
     72 #define	XCALLFRAME_SIZ		(11*SZREG)
     73 #define	XCALLFRAME_RA		(10*SZREG)
     74 #define	XCALLFRAME_GP		(9*SZREG)
     75 #define	XCALLFRAME_S0		(8*SZREG)
     76 #define	XCALLFRAME_A3		(7*SZREG)
     77 #define	XCALLFRAME_A2		(6*SZREG)
     78 #define	XCALLFRAME_A1		(5*SZREG)
     79 #define	XCALLFRAME_A0		(4*SZREG)
     80 #if defined(__mips_n32) || defined(__mips_n64)
     81 #define	XCALLFRAME_A7		(3*SZREG)
     82 #define	XCALLFRAME_A6		(2*SZREG)
     83 #define	XCALLFRAME_A5		(1*SZREG)
     84 #define	XCALLFRAME_A4		(0*SZREG)
     85 #endif
     86 
     87 	.globl	_rtld_bind_start
     88 	.ent	_rtld_bind_start
     89 _rtld_bind_start:
     90 #if defined(__mips_o32) || defined(__mips_o64)
     91 	move	v1, gp			# save old GP
     92 	PTR_ADDU t9, 8			# modify T9 to point at .cpload
     93 #endif
     94 	SETUP_GP
     95 	PTR_SUBU sp, XCALLFRAME_SIZ	# save arguments and sp value in stack
     96 	SETUP_GP64(XCALLFRAME_GP, _rtld_bind_start)
     97 	SAVE_GP(XCALLFRAME_GP)
     98 #if defined(__mips_n32) || defined(__mips_n64)
     99 	REG_S	a4,  XCALLFRAME_A4(sp)
    100 	REG_S	a5,  XCALLFRAME_A5(sp)
    101 	REG_S	a6,  XCALLFRAME_A6(sp)
    102 	REG_S	a7,  XCALLFRAME_A7(sp)
    103 #endif
    104 	REG_S	a0,  XCALLFRAME_A0(sp)
    105 	REG_S	a1,  XCALLFRAME_A1(sp)
    106 	REG_S	a2,  XCALLFRAME_A2(sp)
    107 	REG_S	a3,  XCALLFRAME_A3(sp)
    108 	REG_S	$15,  XCALLFRAME_RA(sp)	# ra is in t7/t3
    109 	REG_S	s0,  XCALLFRAME_SP(sp)
    110 	move	s0, sp
    111 	move	a0, t8			# symbol index
    112 	move	a1, $15			# old RA
    113 	move	a2, v1			# old GP
    114 	move	a3, ra			# current RA
    115 	jal	_C_LABEL(_rtld_bind)
    116 	 nop
    117 	move	sp, s0
    118 	REG_L	ra, XCALLFRAME_RA(sp)
    119 	REG_L	s0, XCALLFRAME_S0(sp)
    120 	REG_L	a0, XCALLFRAME_A0(sp)
    121 	REG_L	a1, XCALLFRAME_A1(sp)
    122 	REG_L	a2, XCALLFRAME_A2(sp)
    123 	REG_L	a3, XCALLFRAME_A3(sp)
    124 #if defined(__mips_n32) || defined(__mips_n64)
    125 	REG_L	a4, XCALLFRAME_A4(sp)
    126 	REG_L	a5, XCALLFRAME_A5(sp)
    127 	REG_L	a6, XCALLFRAME_A6(sp)
    128 	REG_L	a7, XCALLFRAME_A7(sp)
    129 #endif
    130 	RESTORE_GP64
    131 	PTR_ADDU sp, XCALLFRAME_SIZ
    132 	move	t9, v0
    133 	jr	t9
    134 	 nop
    135 END(_rtld_bind_start)
    136