1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
{
This file is part of the Free Pascal run time library.
Copyright (c) 2005 by Michael Van Canneyt, Peter Vreman,
& Daniel Mantione, members of the Free Pascal development team.
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{
Linux/uClibc startup code for Free Pascal
taken from uClibc/sysdeps/linux/i386/crt1.S
%edx Contains a function pointer to be registered with `atexit'.
This is how the dynamic linker arranges to have DT_FINI
functions called for shared libraries that have been loaded
before this code runs.
Stack layout at program start:
nil
envn
....
.... ENVIRONMENT VARIABLES
env1
env0
nil
argn
....
.... COMMAND LINE OPTIONS
arg1
arg0
argc <--- esp
}
var
dlexitproc: pointer; { atexit from loader }
procedure uclibc_init; external name '__uClibc_init';
procedure uclibc_fini; external name '__uClibc_fini';
procedure uclibc_exit; external name 'exit';
procedure uclibc_main; external name '__uClibc_main';
procedure PASCALMAIN; external name 'PASCALMAIN';
{ Some helpers }
{$ifdef FPC_PIC}
function get3eipasebx : pointer; compilerproc; nostackframe; assembler;
asm
movl (%esp),%ebx
ret
end;
{$endif FPC_PIC}
procedure _init_fini_dummy; compilerproc; nostackframe; assembler;
asm
ret
end;
{******************************************************************************
glibc 2.1 lib + profiling start/halt
******************************************************************************}
{$asmmode ATT}
procedure _FPC_libc21_start; assembler; nostackframe; public name '_start';
asm
xorl %ebp,%ebp
{ First locate the start of the environment variables }
popl %ecx { Get argc in ecx }
movl %esp,%ebx { Esp now points to the arguments }
leal 4(%esp,%ecx,4),%eax { The start of the environment is: esp+4*eax+4 }
andl $0xfffffff8,%esp { Align stack }
{$ifdef FPC_PIC}
pushl %edx
pushl %ebx
pushl %ecx
call get3eipasebx
addl $_GLOBAL_OFFSET_TABLE_,%ebx
movl dlexitproc@GOT(%ebx),%ecx
movl %edx,(%ecx)
movl operatingsystem_parameter_envp@GOT(%ebx),%ecx
movl %eax,(%ecx)
movl operatingsystem_parameter_argc@GOT(%ebx),%edx
popl %ecx
movl %ecx,(%edx)
movl operatingsystem_parameter_argv@GOT(%ebx),%edx
popl %ebx
movl %ebx,(%edx)
popl %edx
{$else FPC_PIC}
movl %edx, dlexitproc
movl %eax,operatingsystem_parameter_envp
movl %ecx,operatingsystem_parameter_argc
movl %ebx,operatingsystem_parameter_argv
{$endif FPC_PIC}
{ Save initial stackpointer }
{$ifdef FPC_PIC}
pushl %ebx
call get3eipasebx
addl $_GLOBAL_OFFSET_TABLE_,%ebx
movl initialstkptr@GOT(%ebx),%ebx
movl %esp,(%ebx)
popl %ebx
{$else FPC_PIC}
movl %esp,initialstkptr
{$endif FPC_PIC}
{ int __libc_start_main(
int *(main) (int, char * *, char * *),
int argc,
char * * ubp_av,
void (*init) (void),
void (*fini) (void),
void (*rtld_fini) (void),
void (* stack_end)); }
pushl %ebp { padding }
pushl %esp { stack_end }
pushl %edx { function to be registered with
atexit(), passed by loader }
pushl $_init_fini_dummy
pushl $_init_fini_dummy
pushl %ebx { Push second argument: argv. }
pushl %ecx { Push first argument: argc. }
pushl $PASCALMAIN
call uclibc_main
hlt
end;
procedure _FPC_libc21_haltproc; assembler; nostackframe; public name '_haltproc';
asm
.Lhaltproc:
{$ifdef FPC_PIC}
call get3eipasebx
addl $_GLOBAL_OFFSET_TABLE_,%ebx
movl ExitCode@GOT(%ebx),%ebx
{$if sizeof(ExitCode)=2}
movzwl (%ebx),%ebx
{$else}
mov (%ebx),%ebx
{$endif}
{$else FPC_PIC}
{$if sizeof(ExitCode)=2}
movzwl ExitCode,%ebx
{$else}
mov ExitCode,%ebx
{$endif}
{$endif FPC_PIC}
pushl %ebx
call uclibc_exit
xorl %eax,%eax
incl %eax { eax=1, exit call }
popl %ebx
int $0x80
jmp .Lhaltproc
end;
|
