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/* $OpenBSD: ldasm.S,v 1.32 2017/08/27 21:59:52 deraadt Exp $ */
/*
* Copyright (c) 1999 Dale Rahn
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#define AUX_entry 9
#include <machine/asm.h>
#include <sys/syscall.h>
ENTRY(_dl_start)
mr 19, 1
stwu 1, (-16 -((AUX_entry+3)*4))(1) # Some space.
mflr 27 /* save off old link register */
stw 27, 4(19) /* save in normal location */
# squirrel away the arguments for main
mr 20, 3 #argc
mr 21, 4 #argv
mr 22, 5 #envp
mr 23, 6 # ???
bcl 20, 31, 1f
1: mflr 30
addis 30, 30, _GLOBAL_OFFSET_TABLE_-1b@ha
addi 30, 30, _GLOBAL_OFFSET_TABLE_-1b@l
bcl 20, 31, 1f
1: mflr 18,
addis 18, 18, _DYNAMIC-1b@ha
addi 18, 18, _DYNAMIC-1b@l
lwz 4, 0(30) # load address of _DYNAMIC according to got.
sub 4, 18, 4 # determine load offset
mr 17, 4 # save for _dl_boot
subi 3, 21, 4 # Get stack pointer (arg0 for _dl_boot).
addi 4, 1, 8 # dl_data
mr 5, 18 # dynamicp
bl _dl_boot_bind@local
mr 3, 21 # argv
mr 4, 22 # envp
mr 5, 17 # loff
addi 6, 1, 8 # dl_data
bl _dl_boot@local
mtctr 3 # put return value into ctr to execute
# get back the squirreled away the arguments for main
mr 3, 20
mr 4, 21
mr 5, 22
mr 6, 23
lwz 7, _dl_dtors@got(30)
mtlr 27
lwz 1, 0(1) # Restore stack pointer.
bctr # Go execute the 'real' program.
ENTRY(_dl_bind_start)
stwu 1,-72(1)
stw 0,8(1) # save r0 - cerror ;-)
mflr 0
stw 0,68(1) # save lr
stw 3,12(1) # save r3-r10, C calling convention
stw 4,20(1) # r13 - r31 are preserved by called code
stw 5,24(1)
stw 6,28(1)
stw 7,32(1)
stw 8,36(1)
stw 9,40(1)
stw 10,44(1)
mr 3,12 # obj
mr 4,11 # reloff
bl _dl_bind@plt # _rtld_bind(obj, reloff)
mtctr 3
lwz 3,12(1)
lwz 4,20(1)
lwz 5,24(1)
lwz 6,28(1)
lwz 7,32(1)
lwz 8,36(1)
lwz 9,40(1)
lwz 10,44(1)
lwz 0,68(1) # restore lr
mtlr 0
lwz 0,8(1)
addi 1,1,72
bctr
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