NetBSD/libexec/ld.elf_so/arch/powerpc/rtld_start.S

138 lines
3.4 KiB
ArmAsm

/* $NetBSD: rtld_start.S,v 1.4 2001/09/26 04:06:43 mycroft Exp $ */
/*-
* Copyright (C) 1998 Tsubai Masanari
* All rights reserved.
*
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
#include <machine/asm.h>
.globl _rtld_start
.globl _rtld
.text
_rtld_start:
stwu 1,-48(1)
stw 3,12(1) # argc
stw 4,16(1) # argv
stw 5,20(1) # envp
/* stw 6,24(1) # obj (always 0) */
/* stw 7,28(1) # cleanup (always 0) */
stw 8,32(1) # ps_strings
bl 1f
.long _GLOBAL_OFFSET_TABLE_-.-4
1:
mflr 3
lwz 4,0(3)
add 3,3,4 # r3 = _GLOBAL_OFFSET_TABLE_ - 4
dcbst 0,3 # sync i-cache with d-cache
sync
icbi 0,3
isync
addi 11,3,4 # r11 = (real) GOT
lwz 10,_GLOBAL_OFFSET_TABLE_@got(11)
# the linker thought GOT were ...
subf 9,10,11 # r9 = displacement
lwz 8,_GOT_END_@got(11)
add 8,8,9 # add the displacement
1: lwz 3,0(11)
add 3,3,9 # add the displacement
stw 3,0(11)
addi 11,11,4 # r11++
cmpl 0,11,8 # done?
blt 1b
lwz 4,16(1)
addi 3,4,-12 # sp = &argv[-3] /* XXX */
bl _rtld@plt # _start = _rtld(sp)
mtlr 3
lwz 3,12(1) # argc
lwz 4,16(1) # argv
lwz 5,20(1) # envp
lwz 6,-8(4) # obj = sp[1] (== argv[-2])
lwz 7,-12(4) # cleanup = sp[0] (== argv[-3])
lwz 8,32(1) # ps_strings
addi 1,1,48
blrl # _start(argc, argv, envp, obj, cleanup, ps_strings)
li 0,1 # _exit()
sc
.globl _rtld_bind_start
.globl _rtld_bind_powerpc
_rtld_bind_start:
stwu 1,-160(1)
stw 0,20(1)
mflr 0
stw 0,16(1) # save lr
mfcr 0
stw 0,12(1) # save cr
stmw 3,24(1) # save r3-r31
mr 3,12 # obj
mr 4,11 # reloff
bl _rtld_bind_powerpc@plt # _rtld_bind(obj, reloff)
mtctr 3
lmw 3,24(1) # load r3-r31
lwz 0,12(1) # restore cr
mtcr 0
lwz 0,16(1) # restore lr
mtlr 0
lwz 0,20(1)
addi 1,1,160
bctr
.globl _rtld_powerpc_pltcall
.globl _rtld_powerpc_pltresolve
_rtld_powerpc_pltcall:
slwi 11,11,2
addis 11,11,0 # addis 11,11,jmptab@ha
lwz 11,0(11) # lwz 11,jmptab@l(11)
mtctr 11
bctr
_rtld_powerpc_pltresolve:
lis 12,0 # lis 12,_rtld_bind_start@ha
addi 12,12,0 # addi 12,12,_rtld_bind_start@l
mtctr 12
lis 12,0 # lis 12,obj@ha
addi 12,12,0 # addi 12,12,obj@l
bctr