cf4aca11b5
_rtld_bind_start must save and restore the condition codes. Varargs functions (like, say, printf()) depend on the state of cr1 to determine whether they need to store floating point registers in the save area. Without this, the first call to any particular varargs function will fail if floating point values were passed.
138 lines
3.4 KiB
ArmAsm
138 lines
3.4 KiB
ArmAsm
/* $NetBSD: rtld_start.S,v 1.4 2001/09/26 04:06:43 mycroft 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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mfcr 0
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stw 0,12(1) # save cr
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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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lmw 3,24(1) # load r3-r31
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lwz 0,12(1) # restore cr
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mtcr 0
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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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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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