sh: fixup many sparse errors.
[linux-2.6.git] / 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 #include <linux/errno.h>
11 #include <linux/sched.h>
12 #include <linux/mm.h>
13 #include <linux/smp.h>
14 #include <linux/sem.h>
15 #include <linux/msg.h>
16 #include <linux/shm.h>
17 #include <linux/stat.h>
18 #include <linux/syscalls.h>
19 #include <linux/mman.h>
20 #include <linux/file.h>
21 #include <linux/utsname.h>
22 #include <linux/module.h>
23 #include <linux/fs.h>
24 #include <linux/ipc.h>
25 #include <asm/cacheflush.h>
26 #include <asm/syscalls.h>
27 #include <asm/uaccess.h>
28 #include <asm/unistd.h>
29
30 unsigned long shm_align_mask = PAGE_SIZE - 1;   /* Sane caches */
31 EXPORT_SYMBOL(shm_align_mask);
32
33 #ifdef CONFIG_MMU
34 /*
35  * To avoid cache aliases, we map the shared page with same color.
36  */
37 #define COLOUR_ALIGN(addr, pgoff)                               \
38         ((((addr) + shm_align_mask) & ~shm_align_mask) +        \
39          (((pgoff) << PAGE_SHIFT) & shm_align_mask))
40
41 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
42         unsigned long len, unsigned long pgoff, unsigned long flags)
43 {
44         struct mm_struct *mm = current->mm;
45         struct vm_area_struct *vma;
46         unsigned long start_addr;
47         int do_colour_align;
48
49         if (flags & MAP_FIXED) {
50                 /* We do not accept a shared mapping if it would violate
51                  * cache aliasing constraints.
52                  */
53                 if ((flags & MAP_SHARED) && (addr & shm_align_mask))
54                         return -EINVAL;
55                 return addr;
56         }
57
58         if (unlikely(len > TASK_SIZE))
59                 return -ENOMEM;
60
61         do_colour_align = 0;
62         if (filp || (flags & MAP_SHARED))
63                 do_colour_align = 1;
64
65         if (addr) {
66                 if (do_colour_align)
67                         addr = COLOUR_ALIGN(addr, pgoff);
68                 else
69                         addr = PAGE_ALIGN(addr);
70
71                 vma = find_vma(mm, addr);
72                 if (TASK_SIZE - len >= addr &&
73                     (!vma || addr + len <= vma->vm_start))
74                         return addr;
75         }
76
77         if (len > mm->cached_hole_size) {
78                 start_addr = addr = mm->free_area_cache;
79         } else {
80                 mm->cached_hole_size = 0;
81                 start_addr = addr = TASK_UNMAPPED_BASE;
82         }
83
84 full_search:
85         if (do_colour_align)
86                 addr = COLOUR_ALIGN(addr, pgoff);
87         else
88                 addr = PAGE_ALIGN(mm->free_area_cache);
89
90         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
91                 /* At this point:  (!vma || addr < vma->vm_end). */
92                 if (unlikely(TASK_SIZE - len < addr)) {
93                         /*
94                          * Start a new search - just in case we missed
95                          * some holes.
96                          */
97                         if (start_addr != TASK_UNMAPPED_BASE) {
98                                 start_addr = addr = TASK_UNMAPPED_BASE;
99                                 mm->cached_hole_size = 0;
100                                 goto full_search;
101                         }
102                         return -ENOMEM;
103                 }
104                 if (likely(!vma || addr + len <= vma->vm_start)) {
105                         /*
106                          * Remember the place where we stopped the search:
107                          */
108                         mm->free_area_cache = addr + len;
109                         return addr;
110                 }
111                 if (addr + mm->cached_hole_size < vma->vm_start)
112                         mm->cached_hole_size = vma->vm_start - addr;
113
114                 addr = vma->vm_end;
115                 if (do_colour_align)
116                         addr = COLOUR_ALIGN(addr, pgoff);
117         }
118 }
119 #endif /* CONFIG_MMU */
120
121 static inline long
122 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
123          unsigned long flags, int fd, unsigned long pgoff)
124 {
125         int error = -EBADF;
126         struct file *file = NULL;
127
128         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
129         if (!(flags & MAP_ANONYMOUS)) {
130                 file = fget(fd);
131                 if (!file)
132                         goto out;
133         }
134
135         down_write(&current->mm->mmap_sem);
136         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
137         up_write(&current->mm->mmap_sem);
138
139         if (file)
140                 fput(file);
141 out:
142         return error;
143 }
144
145 asmlinkage int old_mmap(unsigned long addr, unsigned long len,
146         unsigned long prot, unsigned long flags,
147         int fd, unsigned long off)
148 {
149         if (off & ~PAGE_MASK)
150                 return -EINVAL;
151         return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
152 }
153
154 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
155         unsigned long prot, unsigned long flags,
156         unsigned long fd, unsigned long pgoff)
157 {
158         return do_mmap2(addr, len, prot, flags, fd, pgoff);
159 }
160
161 /*
162  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
163  *
164  * This is really horribly ugly.
165  */
166 asmlinkage int sys_ipc(uint call, int first, int second,
167                        int third, void __user *ptr, long fifth)
168 {
169         int version, ret;
170
171         version = call >> 16; /* hack for backward compatibility */
172         call &= 0xffff;
173
174         if (call <= SEMTIMEDOP)
175                 switch (call) {
176                 case SEMOP:
177                         return sys_semtimedop(first,
178                                               (struct sembuf __user *)ptr,
179                                               second, NULL);
180                 case SEMTIMEDOP:
181                         return sys_semtimedop(first,
182                                 (struct sembuf __user *)ptr, second,
183                                 (const struct timespec __user *)fifth);
184                 case SEMGET:
185                         return sys_semget (first, second, third);
186                 case SEMCTL: {
187                         union semun fourth;
188                         if (!ptr)
189                                 return -EINVAL;
190                         if (get_user(fourth.__pad, (void __user * __user *) ptr))
191                                 return -EFAULT;
192                         return sys_semctl (first, second, third, fourth);
193                         }
194                 default:
195                         return -EINVAL;
196                 }
197
198         if (call <= MSGCTL)
199                 switch (call) {
200                 case MSGSND:
201                         return sys_msgsnd (first, (struct msgbuf __user *) ptr,
202                                           second, third);
203                 case MSGRCV:
204                         switch (version) {
205                         case 0:
206                         {
207                                 struct ipc_kludge tmp;
208
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
217                                 return sys_msgrcv (first, tmp.msgp, second,
218                                                    tmp.msgtyp, third);
219                         }
220                         default:
221                                 return sys_msgrcv (first,
222                                                    (struct msgbuf __user *) ptr,
223                                                    second, fifth, third);
224                         }
225                 case MSGGET:
226                         return sys_msgget ((key_t) first, second);
227                 case MSGCTL:
228                         return sys_msgctl (first, second,
229                                            (struct msqid_ds __user *) ptr);
230                 default:
231                         return -EINVAL;
232                 }
233         if (call <= SHMCTL)
234                 switch (call) {
235                 case SHMAT:
236                         switch (version) {
237                         default: {
238                                 ulong raddr;
239                                 ret = do_shmat (first, (char __user *) ptr,
240                                                  second, &raddr);
241                                 if (ret)
242                                         return ret;
243                                 return put_user (raddr, (ulong __user *) third);
244                         }
245                         case 1: /* iBCS2 emulator entry point */
246                                 if (!segment_eq(get_fs(), get_ds()))
247                                         return -EINVAL;
248                                 return do_shmat (first, (char __user *) ptr,
249                                                   second, (ulong *) third);
250                         }
251                 case SHMDT:
252                         return sys_shmdt ((char __user *)ptr);
253                 case SHMGET:
254                         return sys_shmget (first, second, third);
255                 case SHMCTL:
256                         return sys_shmctl (first, second,
257                                            (struct shmid_ds __user *) ptr);
258                 default:
259                         return -EINVAL;
260                 }
261
262         return -EINVAL;
263 }
264
265 asmlinkage int sys_uname(struct old_utsname __user *name)
266 {
267         int err;
268         if (!name)
269                 return -EFAULT;
270         down_read(&uts_sem);
271         err = copy_to_user(name, utsname(), sizeof(*name));
272         up_read(&uts_sem);
273         return err?-EFAULT:0;
274 }