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
|
/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/* When we enter this piece of code, the user stack looks like this:
* argc argument counter (integer)
* argv[0] program name (pointer)
* argv[1...N] program args (pointers)
* NULL
* env[0...N] environment variables (pointers)
* NULL
* When we are done here, we want
* R0=argc
* R1=*argv[0]
* R2=*envp[0]
*/
.text
.align 2
.global _start;
.type _start,STT_FUNC;
.global ___uClibc_main;
.type ___uClibc_main,STT_FUNC;
/* Stick in a dummy reference to main(), so that if an application
* is linking when the main() function is in a static library (.a)
* we can be sure that main() actually gets linked in */
.type _main,STT_FUNC;
_start:
/* clear the frame pointer */
FP = 0;
/* Load register R0 (argc) from the stack to its final resting place */
P0 = SP;
R0 = [P0++];
/* Copy argv pointer into R1 -- which its final resting place */
R1 = P0;
/* Skip to the end of argv and put a pointer to the environment in R2 */
R2 = R0;
R2 <<= 2;
R2 += 4;
R2 = R1+R2;
/* Ok, now run uClibc's main() -- shouldn't return */
sp += -12;
jump.l ___uClibc_main;
|
