132 lines
3.4 KiB
ArmAsm
132 lines
3.4 KiB
ArmAsm
/* $NetBSD: rtld_start.S,v 1.1 1998/11/24 11:34:31 tsubai Exp $ */
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/*-
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* Copyright (C) 1998 Tsubai Masanari
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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.globl _rtld_start
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.globl _rtld
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.text
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_rtld_start:
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stwu 1,-48(1)
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stw 3,12(1) # argc
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stw 4,16(1) # argv
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stw 5,20(1) # envp
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/* stw 6,24(1) # obj (always 0) */
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/* stw 7,28(1) # cleanup (always 0) */
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stw 8,32(1) # ps_strings
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bl 1f
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.long _GLOBAL_OFFSET_TABLE_-.-4
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1:
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mflr 3
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lwz 4,0(3)
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add 3,3,4 # r3 = _GLOBAL_OFFSET_TABLE_ - 4
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dcbst 0,3 # sync i-cache with d-cache
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sync
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icbi 0,3
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isync
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addi 11,3,4 # r11 = (real) GOT
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lwz 10,_GLOBAL_OFFSET_TABLE_@got(11)
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# the linker thought GOT were ...
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subf 9,10,11 # r9 = displacement
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lwz 8,_GOT_END_@got(11)
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add 8,8,9 # add the displacement
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1: lwz 3,0(11)
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add 3,3,9 # add the displacement
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stw 3,0(11)
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addi 11,11,4 # r11++
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cmpl 0,11,8 # done?
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blt 1b
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lwz 4,16(1)
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addi 3,4,-12 # sp = &argv[-3] /* XXX */
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bl _rtld@plt # _start = _rtld(sp)
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mtlr 3
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lwz 3,12(1) # argc
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lwz 4,16(1) # argv
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lwz 5,20(1) # envp
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lwz 6,-8(4) # obj = sp[1] (== argv[-2])
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lwz 7,-12(4) # cleanup = sp[0] (== argv[-3])
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lwz 8,32(1) # ps_strings
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addi 1,1,48
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blrl # _start(argc, argv, envp, obj, cleanup, ps_strings)
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li 0,1 # _exit()
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sc
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.globl _rtld_bind_start
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.globl _rtld_bind_powerpc
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_rtld_bind_start:
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stwu 1,-160(1)
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stw 0,20(1)
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mflr 0
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stw 0,16(1) # save lr
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stmw 3,24(1) # save r3-r31
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mr 3,12 # obj
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mr 4,11 # reloff
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bl _rtld_bind_powerpc@plt # _rtld_bind(obj, reloff)
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mtctr 3
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lwz 0,16(1) # restore lr
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mtlr 0
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lwz 0,20(1)
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lmw 3,24(1) # load r3-r31
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addi 1,1,160
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bctr
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.globl _rtld_powerpc_pltcall
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.globl _rtld_powerpc_pltresolve
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_rtld_powerpc_pltcall:
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slwi 11,11,2
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addis 11,11,0 # addis 11,11,jmptab@ha
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lwz 11,0(11) # lwz 11,jmptab@l(11)
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mtctr 11
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bctr
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_rtld_powerpc_pltresolve:
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lis 12,0 # lis 12,_rtld_bind_start@ha
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addi 12,12,0 # addi 12,12,_rtld_bind_start@l
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mtctr 12
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lis 12,0 # lis 12,obj@ha
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addi 12,12,0 # addi 12,12,obj@l
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bctr
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