[PATCH] consolidate sys_shmat
[linux-3.10.git] / arch / sh64 / kernel / sys_sh64.c
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * arch/sh64/kernel/sys_sh64.c
7  *
8  * Copyright (C) 2000, 2001  Paolo Alberelli
9  *
10  * This file contains various random system calls that
11  * have a non-standard calling sequence on the Linux/SH5
12  * platform.
13  *
14  * Mostly taken from i386 version.
15  *
16  */
17
18 #include <linux/errno.h>
19 #include <linux/rwsem.h>
20 #include <linux/sched.h>
21 #include <linux/mm.h>
22 #include <linux/smp.h>
23 #include <linux/smp_lock.h>
24 #include <linux/sem.h>
25 #include <linux/msg.h>
26 #include <linux/shm.h>
27 #include <linux/stat.h>
28 #include <linux/mman.h>
29 #include <linux/file.h>
30 #include <linux/utsname.h>
31 #include <linux/syscalls.h>
32 #include <asm/uaccess.h>
33 #include <asm/ipc.h>
34 #include <asm/ptrace.h>
35
36 #define REG_3   3
37
38 /*
39  * sys_pipe() is the normal C calling standard for creating
40  * a pipe. It's not the way Unix traditionally does this, though.
41  */
42 #ifdef NEW_PIPE_IMPLEMENTATION
43 asmlinkage int sys_pipe(unsigned long * fildes,
44                         unsigned long   dummy_r3,
45                         unsigned long   dummy_r4,
46                         unsigned long   dummy_r5,
47                         unsigned long   dummy_r6,
48                         unsigned long   dummy_r7,
49                         struct pt_regs * regs)     /* r8 = pt_regs  forced by entry.S */
50 {
51         int fd[2];
52         int ret;
53
54         ret = do_pipe(fd);
55         if (ret == 0)
56                 /*
57                  ***********************************************************************
58                  *   To avoid the copy_to_user we prefer to break the ABIs convention, *
59                  *   packing the valid pair of file IDs into a single register (r3);   *
60                  *   while r2 is the return code as defined by the sh5-ABIs.           *
61                  *   BE CAREFUL: pipe stub, into glibc, must be aware of this solution *
62                  ***********************************************************************
63
64 #ifdef __LITTLE_ENDIAN__
65                 regs->regs[REG_3] = (((unsigned long long) fd[1]) << 32) | ((unsigned long long) fd[0]);
66 #else
67                 regs->regs[REG_3] = (((unsigned long long) fd[0]) << 32) | ((unsigned long long) fd[1]);
68 #endif
69
70                 */
71                /* although not very clever this is endianess independent */
72                 regs->regs[REG_3] = (unsigned long long) *((unsigned long long *) fd);
73
74         return ret;
75 }
76
77 #else
78 asmlinkage int sys_pipe(unsigned long * fildes)
79 {
80         int fd[2];
81         int error;
82
83         error = do_pipe(fd);
84         if (!error) {
85                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
86                         error = -EFAULT;
87         }
88         return error;
89 }
90
91 #endif
92
93 /*
94  * To avoid cache alias, we map the shard page with same color.
95  */
96 #define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
97
98 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
99         unsigned long len, unsigned long pgoff, unsigned long flags)
100 {
101         struct vm_area_struct *vma;
102
103         if (flags & MAP_FIXED) {
104                 /* We do not accept a shared mapping if it would violate
105                  * cache aliasing constraints.
106                  */
107                 if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
108                         return -EINVAL;
109                 return addr;
110         }
111
112         if (len > TASK_SIZE)
113                 return -ENOMEM;
114         if (!addr)
115                 addr = TASK_UNMAPPED_BASE;
116
117         if (flags & MAP_PRIVATE)
118                 addr = PAGE_ALIGN(addr);
119         else
120                 addr = COLOUR_ALIGN(addr);
121
122         for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
123                 /* At this point:  (!vma || addr < vma->vm_end). */
124                 if (TASK_SIZE - len < addr)
125                         return -ENOMEM;
126                 if (!vma || addr + len <= vma->vm_start)
127                         return addr;
128                 addr = vma->vm_end;
129                 if (!(flags & MAP_PRIVATE))
130                         addr = COLOUR_ALIGN(addr);
131         }
132 }
133
134 /* common code for old and new mmaps */
135 static inline long do_mmap2(
136         unsigned long addr, unsigned long len,
137         unsigned long prot, unsigned long flags,
138         unsigned long fd, unsigned long pgoff)
139 {
140         int error = -EBADF;
141         struct file * file = NULL;
142
143         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
144         if (!(flags & MAP_ANONYMOUS)) {
145                 file = fget(fd);
146                 if (!file)
147                         goto out;
148         }
149
150         down_write(&current->mm->mmap_sem);
151         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
152         up_write(&current->mm->mmap_sem);
153
154         if (file)
155                 fput(file);
156 out:
157         return error;
158 }
159
160 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
161         unsigned long prot, unsigned long flags,
162         unsigned long fd, unsigned long pgoff)
163 {
164         return do_mmap2(addr, len, prot, flags, fd, pgoff);
165 }
166
167 asmlinkage int old_mmap(unsigned long addr, unsigned long len,
168         unsigned long prot, unsigned long flags,
169         int fd, unsigned long off)
170 {
171         if (off & ~PAGE_MASK)
172                 return -EINVAL;
173         return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
174 }
175
176 /*
177  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
178  *
179  * This is really horribly ugly.
180  */
181 asmlinkage int sys_ipc(uint call, int first, int second,
182                        int third, void __user *ptr, long fifth)
183 {
184         int version, ret;
185
186         version = call >> 16; /* hack for backward compatibility */
187         call &= 0xffff;
188
189         if (call <= SEMCTL)
190                 switch (call) {
191                 case SEMOP:
192                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
193                                               second, NULL);
194                 case SEMTIMEDOP:
195                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
196                                               second,
197                                               (const struct timespec __user *)fifth);
198                 case SEMGET:
199                         return sys_semget (first, second, third);
200                 case SEMCTL: {
201                         union semun fourth;
202                         if (!ptr)
203                                 return -EINVAL;
204                         if (get_user(fourth.__pad, (void * __user *) ptr))
205                                 return -EFAULT;
206                         return sys_semctl (first, second, third, fourth);
207                         }
208                 default:
209                         return -EINVAL;
210                 }
211
212         if (call <= MSGCTL)
213                 switch (call) {
214                 case MSGSND:
215                         return sys_msgsnd (first, (struct msgbuf __user *) ptr,
216                                           second, third);
217                 case MSGRCV:
218                         switch (version) {
219                         case 0: {
220                                 struct ipc_kludge tmp;
221                                 if (!ptr)
222                                         return -EINVAL;
223
224                                 if (copy_from_user(&tmp,
225                                                    (struct ipc_kludge __user *) ptr,
226                                                    sizeof (tmp)))
227                                         return -EFAULT;
228                                 return sys_msgrcv (first, tmp.msgp, second,
229                                                    tmp.msgtyp, third);
230                                 }
231                         default:
232                                 return sys_msgrcv (first,
233                                                    (struct msgbuf __user *) ptr,
234                                                    second, fifth, third);
235                         }
236                 case MSGGET:
237                         return sys_msgget ((key_t) first, second);
238                 case MSGCTL:
239                         return sys_msgctl (first, second,
240                                            (struct msqid_ds __user *) ptr);
241                 default:
242                         return -EINVAL;
243                 }
244         if (call <= SHMCTL)
245                 switch (call) {
246                 case SHMAT:
247                         switch (version) {
248                         default: {
249                                 ulong raddr;
250                                 ret = do_shmat (first, (char __user *) ptr,
251                                                  second, &raddr);
252                                 if (ret)
253                                         return ret;
254                                 return put_user (raddr, (ulong __user *) third);
255                         }
256                         case 1: /* iBCS2 emulator entry point */
257                                 if (!segment_eq(get_fs(), get_ds()))
258                                         return -EINVAL;
259                                 return do_shmat (first, (char __user *) ptr,
260                                                   second, (ulong *) third);
261                         }
262                 case SHMDT:
263                         return sys_shmdt ((char __user *)ptr);
264                 case SHMGET:
265                         return sys_shmget (first, second, third);
266                 case SHMCTL:
267                         return sys_shmctl (first, second,
268                                            (struct shmid_ds __user *) ptr);
269                 default:
270                         return -EINVAL;
271                 }
272
273         return -EINVAL;
274 }
275
276 asmlinkage int sys_uname(struct old_utsname * name)
277 {
278         int err;
279         if (!name)
280                 return -EFAULT;
281         down_read(&uts_sem);
282         err=copy_to_user(name, &system_utsname, sizeof (*name));
283         up_read(&uts_sem);
284         return err?-EFAULT:0;
285 }