1993-11-03 23:41:59 +00:00
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/*
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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 withough 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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1993-12-10 10:16:00 +00:00
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* $Id: mdprologue.S,v 1.2 1993/11/09 04:19:18 paul Exp $
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1993-11-03 23:41:59 +00:00
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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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#define LCALL(x,y) .byte 0x9a ; .long y; .word x
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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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#define FRAME 12 /* Size of stack frame */
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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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subl $FRAME, %esp
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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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movl (-FRAME-4)(%ebp), %ebx # restore %ebx
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leave # remove stack frame,
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1993-12-10 10:16:00 +00:00
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ret # lets rock
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1993-11-03 23:41:59 +00:00
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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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movl $0, %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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# Special system call stubs which return real and effective user and group
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1993-12-10 10:16:00 +00:00
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# ids. Saves overhead of making separate calls for each.
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1993-11-03 23:41:59 +00:00
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# !! Relies on compatability option in BSD 4.three-and-a-half
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.globl _getreuid, _getregid
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_getreuid:
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lea SYS_getuid, %eax
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LCALL(7,0)
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jc out
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movl 4(%esp), %ecx # get 1st arg
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movl %eax, (%ecx) # put value in it
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movl 8(%esp), %ecx # same for 2nd arg
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movl %edx, (%ecx) #
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ret # done
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_getregid:
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lea SYS_getgid, %eax
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LCALL(7,0)
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jc out
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movl 4(%esp), %ecx # get 1st arg
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movl %eax, (%ecx) # put value in it
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movl 8(%esp), %ecx # same for 2nd arg
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movl %edx, (%ecx) #
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ret # done
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out: jmp cerror@PLT # Call common error routine
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