Merge with /pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[linux-2.6] / arch / m32r / kernel / sys_m32r.c
1 /*
2  * linux/arch/m32r/kernel/sys_m32r.c
3  *
4  * This file contains various random system calls that
5  * have a non-standard calling sequence on the Linux/M32R platform.
6  *
7  * Taken from i386 version.
8  */
9
10 #include <linux/config.h>
11 #include <linux/errno.h>
12 #include <linux/sched.h>
13 #include <linux/mm.h>
14 #include <linux/smp.h>
15 #include <linux/smp_lock.h>
16 #include <linux/sem.h>
17 #include <linux/msg.h>
18 #include <linux/shm.h>
19 #include <linux/stat.h>
20 #include <linux/syscalls.h>
21 #include <linux/mman.h>
22 #include <linux/file.h>
23 #include <linux/utsname.h>
24
25 #include <asm/uaccess.h>
26 #include <asm/cachectl.h>
27 #include <asm/cacheflush.h>
28 #include <asm/ipc.h>
29
30 /*
31  * sys_tas() - test-and-set
32  */
33 asmlinkage int sys_tas(int *addr)
34 {
35         int oldval;
36
37         if (!access_ok(VERIFY_WRITE, addr, sizeof (int)))
38                 return -EFAULT;
39
40         /* atomic operation:
41          *   oldval = *addr; *addr = 1;
42          */
43         __asm__ __volatile__ (
44                 DCACHE_CLEAR("%0", "r4", "%1")
45                 "       .fillinsn\n"
46                 "1:\n"
47                 "       lock    %0, @%1     ->  unlock  %2, @%1\n"
48                 "2:\n"
49                 /* NOTE:
50                  *   The m32r processor can accept interrupts only
51                  *   at the 32-bit instruction boundary.
52                  *   So, in the above code, the "unlock" instruction
53                  *   can be executed continuously after the "lock"
54                  *   instruction execution without any interruptions.
55                  */
56                 ".section .fixup,\"ax\"\n"
57                 "       .balign 4\n"
58                 "3:     ldi     %0, #%3\n"
59                 "       seth    r14, #high(2b)\n"
60                 "       or3     r14, r14, #low(2b)\n"
61                 "       jmp     r14\n"
62                 ".previous\n"
63                 ".section __ex_table,\"a\"\n"
64                 "       .balign 4\n"
65                 "       .long 1b,3b\n"
66                 ".previous\n"
67                 : "=&r" (oldval)
68                 : "r" (addr), "r" (1), "i"(-EFAULT)
69                 : "r14", "memory"
70 #ifdef CONFIG_CHIP_M32700_TS1
71                   , "r4"
72 #endif /* CONFIG_CHIP_M32700_TS1 */
73         );
74
75         return oldval;
76 }
77
78 /*
79  * sys_pipe() is the normal C calling standard for creating
80  * a pipe. It's not the way Unix traditionally does this, though.
81  */
82 asmlinkage int
83 sys_pipe(unsigned long r0, unsigned long r1, unsigned long r2,
84         unsigned long r3, unsigned long r4, unsigned long r5,
85         unsigned long r6, struct pt_regs regs)
86 {
87         int fd[2];
88         int error;
89
90         error = do_pipe(fd);
91         if (!error) {
92                 if (copy_to_user((void *)r0, (void *)fd, 2*sizeof(int)))
93                         error = -EFAULT;
94         }
95         return error;
96 }
97
98 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
99         unsigned long prot, unsigned long flags,
100         unsigned long fd, unsigned long pgoff)
101 {
102         int error = -EBADF;
103         struct file *file = NULL;
104
105         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
106         if (!(flags & MAP_ANONYMOUS)) {
107                 file = fget(fd);
108                 if (!file)
109                         goto out;
110         }
111
112         down_write(&current->mm->mmap_sem);
113         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
114         up_write(&current->mm->mmap_sem);
115
116         if (file)
117                 fput(file);
118 out:
119         return error;
120 }
121
122 /*
123  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
124  *
125  * This is really horribly ugly.
126  */
127 asmlinkage int sys_ipc(uint call, int first, int second,
128                        int third, void __user *ptr, long fifth)
129 {
130         int version, ret;
131
132         version = call >> 16; /* hack for backward compatibility */
133         call &= 0xffff;
134
135         switch (call) {
136         case SEMOP:
137                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
138                                       second, NULL);
139         case SEMTIMEDOP:
140                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
141                                       second, (const struct timespec __user *)fifth);
142         case SEMGET:
143                 return sys_semget (first, second, third);
144         case SEMCTL: {
145                 union semun fourth;
146                 if (!ptr)
147                         return -EINVAL;
148                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
149                         return -EFAULT;
150                 return sys_semctl (first, second, third, fourth);
151                 }
152
153         case MSGSND:
154                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
155                                    second, third);
156         case MSGRCV:
157                 switch (version) {
158                 case 0: {
159                         struct ipc_kludge tmp;
160                         if (!ptr)
161                                 return -EINVAL;
162
163                         if (copy_from_user(&tmp,
164                                            (struct ipc_kludge __user *) ptr,
165                                            sizeof (tmp)))
166                                 return -EFAULT;
167                         return sys_msgrcv (first, tmp.msgp, second,
168                                            tmp.msgtyp, third);
169                         }
170                 default:
171                         return sys_msgrcv (first,
172                                            (struct msgbuf __user *) ptr,
173                                            second, fifth, third);
174                 }
175         case MSGGET:
176                 return sys_msgget ((key_t) first, second);
177         case MSGCTL:
178                 return sys_msgctl (first, second,
179                                    (struct msqid_ds __user *) ptr);
180         case SHMAT: {
181                 ulong raddr;
182
183                 if (!access_ok(VERIFY_WRITE, (ulong __user *) third,
184                                       sizeof(ulong)))
185                         return -EFAULT;
186                 ret = do_shmat (first, (char __user *) ptr, second, &raddr);
187                 if (ret)
188                         return ret;
189                 return put_user (raddr, (ulong __user *) third);
190                 }
191         case SHMDT:
192                 return sys_shmdt ((char __user *)ptr);
193         case SHMGET:
194                 return sys_shmget (first, second, third);
195         case SHMCTL:
196                 return sys_shmctl (first, second,
197                                    (struct shmid_ds __user *) ptr);
198         default:
199                 return -ENOSYS;
200         }
201 }
202
203 asmlinkage int sys_uname(struct old_utsname * name)
204 {
205         int err;
206         if (!name)
207                 return -EFAULT;
208         down_read(&uts_sem);
209         err=copy_to_user(name, &system_utsname, sizeof (*name));
210         up_read(&uts_sem);
211         return err?-EFAULT:0;
212 }
213
214 asmlinkage int sys_cacheflush(void *addr, int bytes, int cache)
215 {
216         /* This should flush more selectivly ...  */
217         _flush_cache_all();
218         return 0;
219 }
220
221 asmlinkage int sys_cachectl(char *addr, int nbytes, int op)
222 {
223         /* Not implemented yet. */
224         return -ENOSYS;
225 }
226