1/*        $NetBSD: rtld_start.S,v 1.11 2010/12/05 00:56:07 joerg Exp $          */
2
3/*-
4 * Copyright (c) 1998, 2002 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas and by Charles M. Hannum.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <machine/asm.h>
33
34          .text
35          .align    4
36          .globl    .rtld_start
37          .hidden   .rtld_start
38          .type     .rtld_start,@function
39.rtld_start:
40          subl      $8,%esp                       # make room of obj_main and exit proc
41          pushl     %ebx                          # save ps_strings
42
43          call      1f
441:
45          popl      %edx
46          leal      _DYNAMIC-1b(%edx),%ecx        # &_DYNAMIC
47          movl      %ecx,%ebx
48          subl      _GLOBAL_OFFSET_TABLE_-1b(%edx),%ebx
49
50          pushl     %ebx                          # relocbase
51          pushl     %ecx                          # &_DYNAMIC
52          call      _rtld_relocate_nonplt_self
53
54          leal      12(%esp),%eax                 # &cleanup
55          pushl     %ebx                          # relocbase
56          pushl     %eax                          # sp
57          call      _rtld                         # _rtld(sp, relocbase)
58
59          addl      $16,%esp            # pop args
60
61          popl      %ebx                          # %ebx = ps_strings
62          popl      %edx                          # %edx = cleanup
63          popl      %ecx                          # %ecx = obj_main
64          jmp       *%eax
65
66          .align    4
67          .globl    _rtld_bind_start
68          .hidden   _rtld_bind_start
69          .type     _rtld_bind_start,@function
70_rtld_bind_start:   # (obj, reloff)
71          pushf                                   # save registers
72          pushl     %eax
73          pushl     %ecx
74          pushl     %edx
75
76          pushl     20(%esp)            # Copy of reloff
77          pushl     20(%esp)            # Copy of obj
78          call      _rtld_bind                    # Call the binder
79          addl      $8,%esp                       # pop binder args
80          movl      %eax,20(%esp)                 # Store function to be called in obj
81
82          popl      %edx
83          popl      %ecx
84          popl      %eax
85          popf
86
87          leal      4(%esp),%esp                  # Discard reloff, do not change eflags
88          ret
89