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
|
/* Copyright (C) 1995, 96, 97, 98, 99, 2000 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <bp-sym.h>
#include <bp-asm.h>
#include "kernel-features.h"
#define EINVAL 22
#define ENOSYS 38
#define SVRSP 16 /* saved register space */
#define PARMS LINKAGE+SVRSP /* space for 4 saved regs */
#define ADDR PARMS
#define LEN ADDR+PTR_SIZE
#define PROT LEN+4
#define FLAGS PROT+4
#define FD FLAGS+4
#define OFFLO FD+4
#define OFFHI OFFLO+4
.text
ENTRY (BP_SYM (__mmap64))
#ifdef __NR_mmap2
/* Save registers. */
pushl %ebp
pushl %ebx
pushl %esi
pushl %edi
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
movl ADDR(%esp), %ebx
movl LEN(%esp), %ecx
movl PROT(%esp), %edx
movl FLAGS(%esp), %esi
movl FD(%esp), %edi
movl $SYS_ify(mmap2), %eax /* System call number in %eax. */
/* Do the system call trap. */
L(do_syscall):
int $0x80
/* Restore registers. */
popl %edi
popl %esi
popl %ebx
popl %ebp
#ifndef __ASSUME_MMAP2_SYSCALL
2:
cmp $-ENOSYS, %eax
je 3f
#endif
/* If 0 > %eax > -4096 there was an error. */
cmpl $-4096, %eax
ja SYSCALL_ERROR_LABEL
/* Successful; return the syscall's value. */
L(pseudo_end):
ret
/* This means the offset value is too large. */
L(einval):
popl %edi
popl %esi
popl %ebx
popl %ebp
movl $-EINVAL, %eax
jmp SYSCALL_ERROR_LABEL
#endif
#if !defined __ASSUME_MMAP2_SYSCALL || !defined __NR_mmap2
3:
/* Save registers. */
movl %ebx, %edx
cmpl $0, OFFHI-SVRSP(%esp)
jne L(einval2)
movl $SYS_ify(mmap), %eax /* System call number in %eax. */
lea ADDR-SVRSP(%esp), %ebx /* Address of args is 1st arg. */
/* Do the system call trap. */
int $0x80
/* Restore registers. */
movl %edx, %ebx
/* If 0 > %eax > -4096 there was an error. */
cmpl $-4096, %eax
ja SYSCALL_ERROR_LABEL
/* Successful; return the syscall's value. */
#ifndef __NR_mmap2
L(pseudo_end):
#endif
ret
L(einval2):
movl %edx, %ebx
movl $-EINVAL, %eax
jmp SYSCALL_ERROR_LABEL
#endif
PSEUDO_END (BP_SYM (__mmap64))
weak_alias (BP_SYM (__mmap64), BP_SYM (mmap64))
|
GitWeb