/home/lenb/src/to-linus branch 'acpi-2.6.12'
[linux-2.6] / arch / sh / kernel / sys_sh.c
1 /*
2  * linux/arch/sh/kernel/sys_sh.c
3  *
4  * This file contains various random system calls that
5  * have a non-standard calling sequence on the Linux/SuperH
6  * platform.
7  *
8  * Taken from i386 version.
9  */
10
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/ipc.h>
27
28 /*
29  * sys_pipe() is the normal C calling standard for creating
30  * a pipe. It's not the way Unix traditionally does this, though.
31  */
32 asmlinkage int sys_pipe(unsigned long r4, unsigned long r5,
33         unsigned long r6, unsigned long r7,
34         struct pt_regs regs)
35 {
36         int fd[2];
37         int error;
38
39         error = do_pipe(fd);
40         if (!error) {
41                 regs.regs[1] = fd[1];
42                 return fd[0];
43         }
44         return error;
45 }
46
47 #if defined(HAVE_ARCH_UNMAPPED_AREA)
48 /*
49  * To avoid cache alias, we map the shard page with same color.
50  */
51 #define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
52
53 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
54         unsigned long len, unsigned long pgoff, unsigned long flags)
55 {
56         struct mm_struct *mm = current->mm;
57         struct vm_area_struct *vma;
58         unsigned long start_addr;
59
60         if (flags & MAP_FIXED) {
61                 /* We do not accept a shared mapping if it would violate
62                  * cache aliasing constraints.
63                  */
64                 if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
65                         return -EINVAL;
66                 return addr;
67         }
68
69         if (len > TASK_SIZE)
70                 return -ENOMEM;
71
72         if (addr) {
73                 if (flags & MAP_PRIVATE)
74                         addr = PAGE_ALIGN(addr);
75                 else
76                         addr = COLOUR_ALIGN(addr);
77                 vma = find_vma(mm, addr);
78                 if (TASK_SIZE - len >= addr &&
79                     (!vma || addr + len <= vma->vm_start))
80                         return addr;
81         }
82         if (len <= mm->cached_hole_size) {
83                 mm->cached_hole_size = 0;
84                 mm->free_area_cache = TASK_UNMAPPED_BASE;
85         }
86         if (flags & MAP_PRIVATE)
87                 addr = PAGE_ALIGN(mm->free_area_cache);
88         else
89                 addr = COLOUR_ALIGN(mm->free_area_cache);
90         start_addr = addr;
91
92 full_search:
93         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
94                 /* At this point:  (!vma || addr < vma->vm_end). */
95                 if (TASK_SIZE - len < addr) {
96                         /*
97                          * Start a new search - just in case we missed
98                          * some holes.
99                          */
100                         if (start_addr != TASK_UNMAPPED_BASE) {
101                                 start_addr = addr = TASK_UNMAPPED_BASE;
102                                 mm->cached_hole_size = 0;
103                                 goto full_search;
104                         }
105                         return -ENOMEM;
106                 }
107                 if (!vma || addr + len <= vma->vm_start) {
108                         /*
109                          * Remember the place where we stopped the search:
110                          */
111                         mm->free_area_cache = addr + len;
112                         return addr;
113                 }
114                 if (addr + mm->cached_hole_size < vma->vm_start)
115                         mm->cached_hole_size = vma->vm_start - addr;
116
117                 addr = vma->vm_end;
118                 if (!(flags & MAP_PRIVATE))
119                         addr = COLOUR_ALIGN(addr);
120         }
121 }
122 #endif
123
124 static inline long
125 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 
126          unsigned long flags, int fd, unsigned long pgoff)
127 {
128         int error = -EBADF;
129         struct file *file = NULL;
130
131         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
132         if (!(flags & MAP_ANONYMOUS)) {
133                 file = fget(fd);
134                 if (!file)
135                         goto out;
136         }
137
138         down_write(&current->mm->mmap_sem);
139         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
140         up_write(&current->mm->mmap_sem);
141
142         if (file)
143                 fput(file);
144 out:
145         return error;
146 }
147
148 asmlinkage int old_mmap(unsigned long addr, unsigned long len,
149         unsigned long prot, unsigned long flags,
150         int fd, unsigned long off)
151 {
152         if (off & ~PAGE_MASK)
153                 return -EINVAL;
154         return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
155 }
156
157 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
158         unsigned long prot, unsigned long flags,
159         unsigned long fd, unsigned long pgoff)
160 {
161         return do_mmap2(addr, len, prot, flags, fd, pgoff);
162 }
163
164 /*
165  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
166  *
167  * This is really horribly ugly.
168  */
169 asmlinkage int sys_ipc(uint call, int first, int second,
170                        int third, void __user *ptr, long fifth)
171 {
172         int version, ret;
173
174         version = call >> 16; /* hack for backward compatibility */
175         call &= 0xffff;
176
177         if (call <= SEMCTL)
178                 switch (call) {
179                 case SEMOP:
180                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
181                                               second, NULL);
182                 case SEMTIMEDOP:
183                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
184                                               second,
185                                               (const struct timespec __user *)fifth);
186                 case SEMGET:
187                         return sys_semget (first, second, third);
188                 case SEMCTL: {
189                         union semun fourth;
190                         if (!ptr)
191                                 return -EINVAL;
192                         if (get_user(fourth.__pad, (void * __user *) ptr))
193                                 return -EFAULT;
194                         return sys_semctl (first, second, third, fourth);
195                         }
196                 default:
197                         return -EINVAL;
198                 }
199
200         if (call <= MSGCTL) 
201                 switch (call) {
202                 case MSGSND:
203                         return sys_msgsnd (first, (struct msgbuf __user *) ptr, 
204                                           second, third);
205                 case MSGRCV:
206                         switch (version) {
207                         case 0: {
208                                 struct ipc_kludge tmp;
209                                 if (!ptr)
210                                         return -EINVAL;
211                                 
212                                 if (copy_from_user(&tmp,
213                                                    (struct ipc_kludge __user *) ptr, 
214                                                    sizeof (tmp)))
215                                         return -EFAULT;
216                                 return sys_msgrcv (first, tmp.msgp, second,
217                                                    tmp.msgtyp, third);
218                                 }
219                         default:
220                                 return sys_msgrcv (first,
221                                                    (struct msgbuf __user *) ptr,
222                                                    second, fifth, third);
223                         }
224                 case MSGGET:
225                         return sys_msgget ((key_t) first, second);
226                 case MSGCTL:
227                         return sys_msgctl (first, second,
228                                            (struct msqid_ds __user *) ptr);
229                 default:
230                         return -EINVAL;
231                 }
232         if (call <= SHMCTL) 
233                 switch (call) {
234                 case SHMAT:
235                         switch (version) {
236                         default: {
237                                 ulong raddr;
238                                 ret = do_shmat (first, (char __user *) ptr,
239                                                  second, &raddr);
240                                 if (ret)
241                                         return ret;
242                                 return put_user (raddr, (ulong __user *) third);
243                         }
244                         case 1: /* iBCS2 emulator entry point */
245                                 if (!segment_eq(get_fs(), get_ds()))
246                                         return -EINVAL;
247                                 return do_shmat (first, (char __user *) ptr,
248                                                   second, (ulong *) third);
249                         }
250                 case SHMDT: 
251                         return sys_shmdt ((char __user *)ptr);
252                 case SHMGET:
253                         return sys_shmget (first, second, third);
254                 case SHMCTL:
255                         return sys_shmctl (first, second,
256                                            (struct shmid_ds __user *) ptr);
257                 default:
258                         return -EINVAL;
259                 }
260         
261         return -EINVAL;
262 }
263
264 asmlinkage int sys_uname(struct old_utsname * name)
265 {
266         int err;
267         if (!name)
268                 return -EFAULT;
269         down_read(&uts_sem);
270         err=copy_to_user(name, &system_utsname, sizeof (*name));
271         up_read(&uts_sem);
272         return err?-EFAULT:0;
273 }
274
275 asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf,
276                              size_t count, long dummy, loff_t pos)
277 {
278         return sys_pread64(fd, buf, count, pos);
279 }
280
281 asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf,
282                               size_t count, long dummy, loff_t pos)
283 {
284         return sys_pwrite64(fd, buf, count, pos);
285 }
286
287 asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
288                                 u32 len0, u32 len1, int advice)
289 {
290 #ifdef  __LITTLE_ENDIAN__
291         return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0,
292                                 (u64)len1 << 32 | len0, advice);
293 #else
294         return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1,
295                                 (u64)len0 << 32 | len1, advice);
296 #endif
297 }