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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/*
* arch/v850/kernel/syscalls.c -- Various system-call definitions not
* defined in machine-independent code
*
* Copyright (C) 2001,02 NEC Corporation
* Copyright (C) 2001,02 Miles Bader <miles@gnu.org>
*
* 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.
*
* This file was derived the ppc version, arch/ppc/kernel/syscalls.c
* ... which was derived from "arch/i386/kernel/sys_i386.c" by Gary Thomas;
* modified by Cort Dougan (cort@cs.nmt.edu)
* and Paul Mackerras (paulus@cs.anu.edu.au).
*/
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/syscalls.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/sys.h>
#include <linux/ipc.h>
#include <linux/utsname.h>
#include <linux/file.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
/*
* sys_ipc() is the de-multiplexer for the SysV IPC calls..
*
* This is really horribly ugly.
*/
int
sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
{
int version, ret;
version = call >> 16; /* hack for backward compatibility */
call &= 0xffff;
ret = -EINVAL;
switch (call) {
case SEMOP:
ret = sys_semop (first, (struct sembuf *)ptr, second);
break;
case SEMGET:
ret = sys_semget (first, second, third);
break;
case SEMCTL:
{
union semun fourth;
if (!ptr)
break;
if ((ret = access_ok(VERIFY_READ, ptr, sizeof(long)) ? 0 : -EFAULT)
|| (ret = get_user(fourth.__pad, (void **)ptr)))
break;
ret = sys_semctl (first, second, third, fourth);
break;
}
case MSGSND:
ret = sys_msgsnd (first, (struct msgbuf *) ptr, second, third);
break;
case MSGRCV:
switch (version) {
case 0: {
struct ipc_kludge tmp;
if (!ptr)
break;
if ((ret = access_ok(VERIFY_READ, ptr, sizeof(tmp)) ? 0 : -EFAULT)
|| (ret = copy_from_user(&tmp,
(struct ipc_kludge *) ptr,
sizeof (tmp))))
break;
ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp,
third);
break;
}
default:
ret = sys_msgrcv (first, (struct msgbuf *) ptr,
second, fifth, third);
break;
}
break;
case MSGGET:
ret = sys_msgget ((key_t) first, second);
break;
case MSGCTL:
ret = sys_msgctl (first, second, (struct msqid_ds *) ptr);
break;
case SHMAT:
switch (version) {
default: {
ulong raddr;
if ((ret = access_ok(VERIFY_WRITE, (ulong*) third,
sizeof(ulong)) ? 0 : -EFAULT))
break;
ret = do_shmat (first, (char *) ptr, second, &raddr);
if (ret)
break;
ret = put_user (raddr, (ulong *) third);
break;
}
case 1: /* iBCS2 emulator entry point */
if (!segment_eq(get_fs(), get_ds()))
break;
ret = do_shmat (first, (char *) ptr, second,
(ulong *) third);
break;
}
break;
case SHMDT:
ret = sys_shmdt ((char *)ptr);
break;
case SHMGET:
ret = sys_shmget (first, second, third);
break;
case SHMCTL:
ret = sys_shmctl (first, second, (struct shmid_ds *) ptr);
break;
}
return ret;
}
static inline unsigned long
do_mmap2 (unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
struct file * file = NULL;
int ret = -EBADF;
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
if (! (flags & MAP_ANONYMOUS)) {
if (!(file = fget (fd)))
goto out;
}
down_write (¤t->mm->mmap_sem);
ret = do_mmap_pgoff (file, addr, len, prot, flags, pgoff);
up_write (¤t->mm->mmap_sem);
if (file)
fput (file);
out:
return ret;
}
unsigned long sys_mmap2 (unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
return do_mmap2 (addr, len, prot, flags, fd, pgoff);
}
unsigned long sys_mmap (unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, off_t offset)
{
int err = -EINVAL;
if (offset & ~PAGE_MASK)
goto out;
err = do_mmap2 (addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
out:
return err;
}
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
register char *__a __asm__ ("r6") = filename;
register void *__b __asm__ ("r7") = argv;
register void *__c __asm__ ("r8") = envp;
register unsigned long __syscall __asm__ ("r12") = __NR_execve;
register unsigned long __ret __asm__ ("r10");
__asm__ __volatile__ ("trap 0"
: "=r" (__ret), "=r" (__syscall)
: "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
: "r1", "r5", "r11", "r13", "r14",
"r15", "r16", "r17", "r18", "r19");
return __ret;
}
|
