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94 lines
3.1 KiB
ArmAsm
94 lines
3.1 KiB
ArmAsm
/*
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* Copyright (c) 1993 Paul Kranenburg
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Paul Kranenburg.
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* 4. 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 OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* i386 run-time link editor entry points.
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*/
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#include <sys/syscall.h>
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.text
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.globl _binder, _binder_entry
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/*
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* _rtl(int version, struct crt_ldso *crtp)
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*/
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_rtl: # crt0 calls us here
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pushl %ebp # Allocate stack frame
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movl %esp,%ebp
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pushl %ebx
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call 1f # PIC function prologue
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1:
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popl %ebx
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addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
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movl 12(%ebp),%eax # Extract data from interface structure
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movl (%eax),%eax # base address of ld.so (first field)
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# setup arguments for rtld()
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movl (%ebx),%ecx # 1st entry in GOT is our __DYNAMIC
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addl %eax,%ecx # add load address
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pushl %ecx # 3rd arg
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pushl 12(%ebp) # 2nd arg == &crt.
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pushl 8(%ebp) # 1st arg == version
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addl _rtld@GOT(%ebx),%eax # relocate address of function
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call %eax # _rtld(version, crtp, DYNAMIC)
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addl $12,%esp # pop arguments
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popl %ebx
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leave # remove stack frame
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ret
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# First call to a procedure generally comes through here for
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# binding.
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_binder_entry:
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pushl %ebp # setup a stack frame
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movl %esp,%ebp
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pusha # save all regs
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xorl %eax,%eax # clear
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movl 4(%ebp),%esi # return address in PLT
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movw (%esi),%ax # get hold of relocation number
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subl $6,%esi # make it point to the jmpslot
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pushl %eax # pushd arguments
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pushl %esi #
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call _binder@PLT # _binder(rpc, index)
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addl $8,%esp # pop arguments
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movl %eax,4(%ebp) # return value from _binder() == actual
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# address of function
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popa # restore regs
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leave # remove our stack frame
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ret
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