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      1 /*	$NetBSD: rtld_start.S,v 1.1 2014/09/03 19:34:26 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas of 3am Software Foundry.
      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 	.globl	_rtld_start
     35 	.globl	_rtld
     36 
     37 #define	CF_LEN		(3*__SIZEOF_POINTER__)
     38 #define	CF_OBJ		(2*__SIZEOF_POINTER__)
     39 #define	CF_CLEANUP	(1*__SIZEOF_POINTER__)
     40 
     41 	/*
     42 	 * void ___start(void (*cleanup)(void), const Obj_Entry *obj,
     43 	 *    struct ps_strings *ps_strings);
     44 	 */
     45 ENTRY_NP(_rtld_start)
     46 	l.sw	CF_LEN(r1), r1		# reserve some stack space
     47 #if 0
     48 	l.ori	r26, r3, 0		# obj		(should be 0)
     49 	l.ori	r28, r4, 0		# cleanup	(should be 0)
     50 #endif
     51 	l.ori	r30, r5, 0		# ps_strings
     52 	l.addi	r1, r1, -CF_LEN
     53 
     54 	PIC_GOTSETUP(r16)
     55 
     56 	l.movhi	r3, gotoffhi(_DYNAMIC)	# get _DYNAMIC gotoff address
     57 	l.ori	r3, r3, gotofflo(_DYNAMIC)
     58 
     59 	l.lwz	r7, 0(r16)		# get base-relative &_DYNAMIC
     60 	l.add	r3, r3, r16		# r3 = _DYNAMIC actual address
     61 	l.sub	r24, r3, r7		# r24 = relocbase
     62 	l.ori	r4, r24, 0		# r4 = relocbase
     63 	l.jal	_C_LABEL(_rtld_relocate_nonplt_self)
     64 	l.nop
     65 
     66 	l.addi	r3, r1, CF_CLEANUP
     67 	l.ori	r4, r24, 0		# r4 = relocbase
     68 	l.jal	_C_LABEL(_rtld)		# _start = _rtld(sp, relocbase)
     69 	l.nop
     70 
     71 	l.lwz	r3, CF_OBJ(r1)		# obj
     72 	l.lwz	r4, CF_CLEANUP(r1)	# cleanup
     73 	l.ori	r5, r30, 0		# ps_strings
     74 
     75 	l.addi	r1, r1, CF_LEN		# pop stack
     76 	l.jalr	r11			# _start(obj, cleanup, ps_strings)
     77 
     78 	l.ori	r13, r0, 1		# _exit()
     79 	l.sys	0
     80 
     81 END(_rtld_start)
     82 
     83 	.globl	_rtld_bind
     84 
     85 /*
     86  * r11 = rela offset
     87  * r12 = GOT[1] (&obj)
     88  * r15 = GOT[2] (&_rtld_bind_start)
     89  */
     90 ENTRY_NP(_rtld_bind_start)
     91 
     92 	l.sw	-4(r1), r9		# save lr
     93 	l.sw	-8(r1), r8		# save arg5
     94 	l.sw	-12(r1), r7		# save arg4
     95 	l.sw	-16(r1), r6		# save arg3
     96 	l.sw	-20(r1), r5		# save arg2
     97 	l.sw	-24(r1), r4		# save arg1
     98 	l.sw	-28(r1), r3		# save arg0
     99 	l.sw	-32(r1), r1		# establish stack frame
    100 	l.addi	r1, r1, -32
    101 
    102 	l.ori	r3, r12, 0		# obj
    103 	l.ori	r4, r11, 0		# reloff
    104 	l.jal	_C_LABEL(_rtld_bind)	# _rtld_bind(obj, reloff)
    105 	l.nop
    106 
    107 	l.addi	r1, r1, 32		# pop stack frame
    108 	l.lwz	r3, -28(r1)		# restore arg0
    109 	l.lwz	r4, -24(r1)		# restore arg1
    110 	l.lwz	r5, -20(r1)		# restore arg2
    111 	l.lwz	r6, -16(r1)		# restore arg3
    112 	l.lwz	r7, -12(r1)		# restore arg4
    113 	l.lwz	r8, -8(r1)		# restore arg5
    114 	l.lwz	r9, -4(r1)		# restore lr
    115 
    116 	l.jr	r11			# jump to routine
    117 	l.nop
    118 END(_rtld_bind_start)
    119