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
|
/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <arch/types.h>
/*
* This structure seeds the stack. We provide the return address of our main
* function, and further down, the address of the function that we call when
* we leave and try to restore the original stack. At the very bottom of the
* stack we store the orignal stack pointer from the calling application.
*/
static void start_main(void);
extern void _leave(void);
static struct {
uint32_t eip[2];
uint32_t raddr[2];
uint32_t esp;
} initial_stack __attribute__ ((section(".istack"))) = {
{ (uint32_t) start_main, 0 },
{ (uint32_t) _leave, 0 },
(uint32_t) & initial_stack,
};
void *_istack = &initial_stack;
/**
* This is our C entry function - set up the system
* and jump into the payload entry point.
*/
static void start_main(void)
{
extern int main(void);
/* Set up the consoles. */
console_init();
/* Gather system information. */
lib_get_sysinfo();
/*
* Any other system init that has to happen before the
* user gets control goes here.
*/
/* Go to the entry point. */
/* In the future we may care about the return value. */
(void) main();
/*
* Returning here will go to the _leave function to return
* us to the original context.
*/
}
|
