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
|
/* Copyright (C) 1995-2014 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <kernel-features.h>
#define EINVAL 22
#define ENOSYS 38
#define SVRSP 16 /* saved register space */
#define PARMS 4+SVRSP /* space for 4 saved regs */
#define ADDR PARMS
#define LEN ADDR+4
#define PROT LEN+4
#define FLAGS PROT+4
#define FD FLAGS+4
#define OFFLO FD+4
#define OFFHI OFFLO+4
.text
ENTRY (__mmap64)
/* Save registers. */
pushl %ebp
cfi_adjust_cfa_offset (4)
pushl %ebx
cfi_adjust_cfa_offset (4)
pushl %esi
cfi_adjust_cfa_offset (4)
pushl %edi
cfi_adjust_cfa_offset (4)
movl OFFLO(%esp), %edx
movl OFFHI(%esp), %ecx
testl $0xfff, %edx
jne L(einval)
shrdl $12, %ecx, %edx /* mmap2 takes the offset in pages. */
shrl $12, %ecx
jne L(einval)
movl %edx, %ebp
cfi_rel_offset (ebp, 12)
movl ADDR(%esp), %ebx
cfi_rel_offset (ebx, 8)
movl LEN(%esp), %ecx
movl PROT(%esp), %edx
movl FLAGS(%esp), %esi
cfi_rel_offset (esi, 4)
movl FD(%esp), %edi
cfi_rel_offset (edi, 0)
movl $SYS_ify(mmap2), %eax /* System call number in %eax. */
/* Do the system call trap. */
L(do_syscall):
ENTER_KERNEL
/* Restore registers. */
popl %edi
cfi_adjust_cfa_offset (-4)
cfi_restore (edi)
popl %esi
cfi_adjust_cfa_offset (-4)
cfi_restore (esi)
popl %ebx
cfi_adjust_cfa_offset (-4)
cfi_restore (ebx)
popl %ebp
cfi_adjust_cfa_offset (-4)
cfi_restore (ebp)
/* If 0 > %eax > -4096 there was an error. */
cmpl $-4096, %eax
ja SYSCALL_ERROR_LABEL
/* Successful; return the syscall's value. */
ret
cfi_adjust_cfa_offset (16)
cfi_rel_offset (ebp, 12)
cfi_rel_offset (ebx, 8)
cfi_rel_offset (esi, 4)
cfi_rel_offset (edi, 0)
/* This means the offset value is too large. */
L(einval):
popl %edi
cfi_adjust_cfa_offset (-4)
cfi_restore (edi)
popl %esi
cfi_adjust_cfa_offset (-4)
cfi_restore (esi)
popl %ebx
cfi_adjust_cfa_offset (-4)
cfi_restore (ebx)
popl %ebp
cfi_adjust_cfa_offset (-4)
cfi_restore (ebp)
movl $-EINVAL, %eax
jmp SYSCALL_ERROR_LABEL
PSEUDO_END (__mmap64)
weak_alias (__mmap64, mmap64)
|
