2 * Copyright (c) 1993 Paul Kranenburg
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Paul Kranenburg.
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 * $FreeBSD: src/libexec/rtld-aout/i386/mdprologue.S,v 1.9 1999/08/28 00:10:08 peter Exp $
34 * i386 run-time link editor entry points.
37 #include <sys/syscall.h>
40 .globl _binder, _binder_entry
43 * _rtl(int version, struct crt_ldso *crtp)
46 _rtl: # crt0 calls us here
47 pushl %ebp # Allocate stack frame
51 call 1f # PIC function prologue
54 addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
56 movl 12(%ebp),%eax # Extract data from interface structure
57 movl (%eax),%eax # base address of ld.so (first field)
58 # setup arguments for rtld()
59 movl (%ebx),%ecx # 1st entry in GOT is our __DYNAMIC
60 addl %eax,%ecx # add load address
62 pushl 12(%ebp) # 2nd arg == &crt.
63 pushl 8(%ebp) # 1st arg == version
64 addl _rtld@GOT(%ebx),%eax # relocate address of function
65 call %eax # _rtld(version, crtp, DYNAMIC)
66 addl $12,%esp # pop arguments
69 leave # remove stack frame
72 # First call to a procedure generally comes through here for
76 pushl %ebp # setup a stack frame
80 xorl %eax,%eax # clear
81 movl 4(%ebp),%esi # return address in PLT
82 movw (%esi),%ax # get hold of relocation number
83 subl $6,%esi # make it point to the jmpslot
85 pushl %eax # pushd arguments
87 call _binder@PLT # _binder(rpc, index)
88 addl $8,%esp # pop arguments
89 movl %eax,4(%ebp) # return value from _binder() == actual
92 leave # remove our stack frame