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
|
/* ia32-crt0.S - Startup code for ia32.
Copyright (C) 2003, 2008 Free Software Foundation, Inc.
Written by Marcus Brinkmann.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
/* The size of our initial stack (32 pages). */
#define STACK_SIZE 0x32000
.text
.globl start, _start
start:
_start:
/* The location of the Hurd startup data is stored in esp. */
movl %esp, __hurd_startup_data
/* Initialize the stack pointer. */
movl $(stack + STACK_SIZE), %esp
/* Reset EFLAGS. */
pushl $0
popf
/* Now enter the cmain function. Instead of using call, we
jump and put a return address of 0 on the stack. We also zeor
the frame pointer. In this way, __builtin_return_address
works more reliably. */
pushl $0
xor %ebp, %ebp
jmp cmain
/* Not reached. */
loop: hlt
jmp loop
.data
/* Our stack area. */
.global stack, _stack
stack:
_stack:
.align 0x1000
.fill STACK_SIZE, 1
.global stack_end, _stack_end
stack_end:
_stack_end:
/* This variable holds a pointer to the Hurd startup data. */
.global __hurd_startup_data
__hurd_startup_data:
.long 0
|
