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
|
/*
* MIPS specific syscalls
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1995, 1996, 1997, 2000 by Ralf Baechle
*/
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/utsname.h>
#include <asm/cachectl.h>
#include <asm/pgalloc.h>
#include <asm/sysmips.h>
#include <asm/uaccess.h>
/*
* How long a hostname can we get from user space?
* -EFAULT if invalid area or too long
* 0 if ok
* >0 EFAULT after xx bytes
*/
static inline int
get_max_hostname(unsigned long address)
{
struct vm_area_struct * vma;
vma = find_vma(current->mm, address);
if (!vma || vma->vm_start > address || !(vma->vm_flags & VM_READ))
return -EFAULT;
address = vma->vm_end - address;
if (address > PAGE_SIZE)
return 0;
if (vma->vm_next && vma->vm_next->vm_start == vma->vm_end &&
(vma->vm_next->vm_flags & VM_READ))
return 0;
return address;
}
asmlinkage int
sys_sysmips(int cmd, int arg1, int arg2, int arg3)
{
int *p;
char *name;
int flags, tmp, len, retval;
switch(cmd) {
case SETNAME: {
char nodename[__NEW_UTS_LEN + 1];
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
name = (char *) arg1;
len = strncpy_from_user(nodename, name, sizeof(nodename));
if (len < 0)
return -EFAULT;
down_write(&uts_sem);
strncpy(system_utsname.nodename, name, len);
up_write(&uts_sem);
system_utsname.nodename[len] = '\0';
return 0;
}
case MIPS_ATOMIC_SET: {
/* This is broken in case of page faults and SMP ...
Risc/OS faults after maximum 20 tries with EAGAIN. */
unsigned int tmp;
p = (int *) arg1;
errno = verify_area(VERIFY_WRITE, p, sizeof(*p));
if (errno)
return errno;
errno = 0;
save_and_cli(flags);
errno |= __get_user(tmp, p);
errno |= __put_user(arg2, p);
restore_flags(flags);
if (errno)
return tmp;
return tmp; /* This is broken ... */
}
case MIPS_FIXADE:
tmp = current->thread.mflags & ~3;
current->thread.mflags = tmp | (arg1 & 3);
retval = 0;
goto out;
case FLUSH_CACHE:
flush_cache_all();
retval = 0;
goto out;
case MIPS_RDNVRAM:
retval = -EIO;
goto out;
default:
retval = -EINVAL;
goto out;
}
out:
return retval;
}
/*
* No implemented yet ...
*/
asmlinkage int
sys_cachectl(char *addr, int nbytes, int op)
{
return -ENOSYS;
}
asmlinkage int sys_pause(void)
{
current->state = TASK_INTERRUPTIBLE;
schedule();
return -ERESTARTNOHAND;
}
|
