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Merge branch 'for-linus' of git://www.linux-m32r.org/git/takata/linux-2.6_dev
[karo-tx-linux.git] / arch / h8300 / kernel / sys_h8300.c
1 /*
2  * linux/arch/h8300/kernel/sys_h8300.c
3  *
4  * This file contains various random system calls that
5  * have a non-standard calling sequence on the H8/300
6  * platform.
7  */
8
9 #include <linux/errno.h>
10 #include <linux/sched.h>
11 #include <linux/mm.h>
12 #include <linux/smp.h>
13 #include <linux/sem.h>
14 #include <linux/msg.h>
15 #include <linux/shm.h>
16 #include <linux/stat.h>
17 #include <linux/syscalls.h>
18 #include <linux/mman.h>
19 #include <linux/file.h>
20 #include <linux/fs.h>
21 #include <linux/ipc.h>
22
23 #include <asm/setup.h>
24 #include <asm/uaccess.h>
25 #include <asm/cachectl.h>
26 #include <asm/traps.h>
27 #include <asm/unistd.h>
28
29 /* common code for old and new mmaps */
30 static inline long do_mmap2(
31         unsigned long addr, unsigned long len,
32         unsigned long prot, unsigned long flags,
33         unsigned long fd, unsigned long pgoff)
34 {
35         int error = -EBADF;
36         struct file * file = NULL;
37
38         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
39         if (!(flags & MAP_ANONYMOUS)) {
40                 file = fget(fd);
41                 if (!file)
42                         goto out;
43         }
44
45         down_write(&current->mm->mmap_sem);
46         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
47         up_write(&current->mm->mmap_sem);
48
49         if (file)
50                 fput(file);
51 out:
52         return error;
53 }
54
55 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
56         unsigned long prot, unsigned long flags,
57         unsigned long fd, unsigned long pgoff)
58 {
59         return do_mmap2(addr, len, prot, flags, fd, pgoff);
60 }
61
62 /*
63  * Perform the select(nd, in, out, ex, tv) and mmap() system
64  * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
65  * handle more than 4 system call parameters, so these system calls
66  * used a memory block for parameter passing..
67  */
68
69 struct mmap_arg_struct {
70         unsigned long addr;
71         unsigned long len;
72         unsigned long prot;
73         unsigned long flags;
74         unsigned long fd;
75         unsigned long offset;
76 };
77
78 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
79 {
80         struct mmap_arg_struct a;
81         int error = -EFAULT;
82
83         if (copy_from_user(&a, arg, sizeof(a)))
84                 goto out;
85
86         error = -EINVAL;
87         if (a.offset & ~PAGE_MASK)
88                 goto out;
89
90         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
91
92         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
93 out:
94         return error;
95 }
96
97 #if 0 /* DAVIDM - do we want this */
98 struct mmap_arg_struct64 {
99         __u32 addr;
100         __u32 len;
101         __u32 prot;
102         __u32 flags;
103         __u64 offset; /* 64 bits */
104         __u32 fd;
105 };
106
107 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
108 {
109         int error = -EFAULT;
110         struct file * file = NULL;
111         struct mmap_arg_struct64 a;
112         unsigned long pgoff;
113
114         if (copy_from_user(&a, arg, sizeof(a)))
115                 return -EFAULT;
116
117         if ((long)a.offset & ~PAGE_MASK)
118                 return -EINVAL;
119
120         pgoff = a.offset >> PAGE_SHIFT;
121         if ((a.offset >> PAGE_SHIFT) != pgoff)
122                 return -EINVAL;
123
124         if (!(a.flags & MAP_ANONYMOUS)) {
125                 error = -EBADF;
126                 file = fget(a.fd);
127                 if (!file)
128                         goto out;
129         }
130         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
131
132         down_write(&current->mm->mmap_sem);
133         error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
134         up_write(&current->mm->mmap_sem);
135         if (file)
136                 fput(file);
137 out:
138         return error;
139 }
140 #endif
141
142 struct sel_arg_struct {
143         unsigned long n;
144         fd_set *inp, *outp, *exp;
145         struct timeval *tvp;
146 };
147
148 asmlinkage int old_select(struct sel_arg_struct *arg)
149 {
150         struct sel_arg_struct a;
151
152         if (copy_from_user(&a, arg, sizeof(a)))
153                 return -EFAULT;
154         /* sys_select() does the appropriate kernel locking */
155         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
156 }
157
158 /*
159  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
160  *
161  * This is really horribly ugly.
162  */
163 asmlinkage int sys_ipc (uint call, int first, int second,
164                         int third, void *ptr, long fifth)
165 {
166         int version, ret;
167
168         version = call >> 16; /* hack for backward compatibility */
169         call &= 0xffff;
170
171         if (call <= SEMCTL)
172                 switch (call) {
173                 case SEMOP:
174                         return sys_semop (first, (struct sembuf *)ptr, second);
175                 case SEMGET:
176                         return sys_semget (first, second, third);
177                 case SEMCTL: {
178                         union semun fourth;
179                         if (!ptr)
180                                 return -EINVAL;
181                         if (get_user(fourth.__pad, (void **) ptr))
182                                 return -EFAULT;
183                         return sys_semctl (first, second, third, fourth);
184                         }
185                 default:
186                         return -EINVAL;
187                 }
188         if (call <= MSGCTL) 
189                 switch (call) {
190                 case MSGSND:
191                         return sys_msgsnd (first, (struct msgbuf *) ptr, 
192                                           second, third);
193                 case MSGRCV:
194                         switch (version) {
195                         case 0: {
196                                 struct ipc_kludge tmp;
197                                 if (!ptr)
198                                         return -EINVAL;
199                                 if (copy_from_user (&tmp,
200                                                     (struct ipc_kludge *)ptr,
201                                                     sizeof (tmp)))
202                                         return -EFAULT;
203                                 return sys_msgrcv (first, tmp.msgp, second,
204                                                    tmp.msgtyp, third);
205                                 }
206                         default:
207                                 return sys_msgrcv (first,
208                                                    (struct msgbuf *) ptr,
209                                                    second, fifth, third);
210                         }
211                 case MSGGET:
212                         return sys_msgget ((key_t) first, second);
213                 case MSGCTL:
214                         return sys_msgctl (first, second,
215                                            (struct msqid_ds *) ptr);
216                 default:
217                         return -EINVAL;
218                 }
219         if (call <= SHMCTL) 
220                 switch (call) {
221                 case SHMAT:
222                         switch (version) {
223                         default: {
224                                 ulong raddr;
225                                 ret = do_shmat (first, (char *) ptr,
226                                                  second, &raddr);
227                                 if (ret)
228                                         return ret;
229                                 return put_user (raddr, (ulong *) third);
230                         }
231                         }
232                 case SHMDT: 
233                         return sys_shmdt ((char *)ptr);
234                 case SHMGET:
235                         return sys_shmget (first, second, third);
236                 case SHMCTL:
237                         return sys_shmctl (first, second,
238                                            (struct shmid_ds *) ptr);
239                 default:
240                         return -EINVAL;
241                 }
242
243         return -EINVAL;
244 }
245
246 /* sys_cacheflush -- no support.  */
247 asmlinkage int
248 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
249 {
250         return -EINVAL;
251 }
252
253 asmlinkage int sys_getpagesize(void)
254 {
255         return PAGE_SIZE;
256 }
257
258 #if defined(CONFIG_SYSCALL_PRINT)
259 asmlinkage void syscall_print(void *dummy,...)
260 {
261         struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
262         printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
263                ((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
264 }
265 #endif
266
267 /*
268  * Do a system call from kernel instead of calling sys_execve so we
269  * end up with proper pt_regs.
270  */
271 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
272 {
273         register long res __asm__("er0");
274         register char *const *_c __asm__("er3") = envp;
275         register char *const *_b __asm__("er2") = argv;
276         register const char * _a __asm__("er1") = filename;
277         __asm__ __volatile__ ("mov.l %1,er0\n\t"
278                         "trapa  #0\n\t"
279                         : "=r" (res)
280                         : "g" (__NR_execve),
281                           "g" (_a),
282                           "g" (_b),
283                           "g" (_c)
284                         : "cc", "memory");
285         return res;
286 }
287
288