Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy...
[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/errno.h>
11 #include <linux/sched.h>
12 #include <linux/mm.h>
13 #include <linux/fs.h>
14 #include <linux/smp.h>
15 #include <linux/sem.h>
16 #include <linux/msg.h>
17 #include <linux/shm.h>
18 #include <linux/stat.h>
19 #include <linux/syscalls.h>
20 #include <linux/mman.h>
21 #include <linux/file.h>
22 #include <linux/utsname.h>
23 #include <linux/ipc.h>
24
25 #include <asm/uaccess.h>
26 #include <asm/cachectl.h>
27 #include <asm/cacheflush.h>
28 #include <asm/syscall.h>
29 #include <asm/unistd.h>
30
31 /*
32  * sys_tas() - test-and-set
33  */
34 asmlinkage int sys_tas(int __user *addr)
35 {
36         int oldval;
37
38         if (!access_ok(VERIFY_WRITE, addr, sizeof (int)))
39                 return -EFAULT;
40
41         /* atomic operation:
42          *   oldval = *addr; *addr = 1;
43          */
44         __asm__ __volatile__ (
45                 DCACHE_CLEAR("%0", "r4", "%1")
46                 "       .fillinsn\n"
47                 "1:\n"
48                 "       lock    %0, @%1     ->  unlock  %2, @%1\n"
49                 "2:\n"
50                 /* NOTE:
51                  *   The m32r processor can accept interrupts only
52                  *   at the 32-bit instruction boundary.
53                  *   So, in the above code, the "unlock" instruction
54                  *   can be executed continuously after the "lock"
55                  *   instruction execution without any interruptions.
56                  */
57                 ".section .fixup,\"ax\"\n"
58                 "       .balign 4\n"
59                 "3:     ldi     %0, #%3\n"
60                 "       seth    r14, #high(2b)\n"
61                 "       or3     r14, r14, #low(2b)\n"
62                 "       jmp     r14\n"
63                 ".previous\n"
64                 ".section __ex_table,\"a\"\n"
65                 "       .balign 4\n"
66                 "       .long 1b,3b\n"
67                 ".previous\n"
68                 : "=&r" (oldval)
69                 : "r" (addr), "r" (1), "i"(-EFAULT)
70                 : "r14", "memory"
71 #ifdef CONFIG_CHIP_M32700_TS1
72                   , "r4"
73 #endif /* CONFIG_CHIP_M32700_TS1 */
74         );
75
76         return oldval;
77 }
78
79 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
80         unsigned long prot, unsigned long flags,
81         unsigned long fd, unsigned long pgoff)
82 {
83         int error = -EBADF;
84         struct file *file = NULL;
85
86         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
87         if (!(flags & MAP_ANONYMOUS)) {
88                 file = fget(fd);
89                 if (!file)
90                         goto out;
91         }
92
93         down_write(&current->mm->mmap_sem);
94         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
95         up_write(&current->mm->mmap_sem);
96
97         if (file)
98                 fput(file);
99 out:
100         return error;
101 }
102
103 /*
104  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
105  *
106  * This is really horribly ugly.
107  */
108 asmlinkage int sys_ipc(uint call, int first, int second,
109                        int third, void __user *ptr, long fifth)
110 {
111         int version, ret;
112
113         version = call >> 16; /* hack for backward compatibility */
114         call &= 0xffff;
115
116         switch (call) {
117         case SEMOP:
118                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
119                                       second, NULL);
120         case SEMTIMEDOP:
121                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
122                                       second, (const struct timespec __user *)fifth);
123         case SEMGET:
124                 return sys_semget (first, second, third);
125         case SEMCTL: {
126                 union semun fourth;
127                 if (!ptr)
128                         return -EINVAL;
129                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
130                         return -EFAULT;
131                 return sys_semctl (first, second, third, fourth);
132                 }
133
134         case MSGSND:
135                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
136                                    second, third);
137         case MSGRCV:
138                 switch (version) {
139                 case 0: {
140                         struct ipc_kludge tmp;
141                         if (!ptr)
142                                 return -EINVAL;
143
144                         if (copy_from_user(&tmp,
145                                            (struct ipc_kludge __user *) ptr,
146                                            sizeof (tmp)))
147                                 return -EFAULT;
148                         return sys_msgrcv (first, tmp.msgp, second,
149                                            tmp.msgtyp, third);
150                         }
151                 default:
152                         return sys_msgrcv (first,
153                                            (struct msgbuf __user *) ptr,
154                                            second, fifth, third);
155                 }
156         case MSGGET:
157                 return sys_msgget ((key_t) first, second);
158         case MSGCTL:
159                 return sys_msgctl (first, second,
160                                    (struct msqid_ds __user *) ptr);
161         case SHMAT: {
162                 ulong raddr;
163
164                 if (!access_ok(VERIFY_WRITE, (ulong __user *) third,
165                                       sizeof(ulong)))
166                         return -EFAULT;
167                 ret = do_shmat (first, (char __user *) ptr, second, &raddr);
168                 if (ret)
169                         return ret;
170                 return put_user (raddr, (ulong __user *) third);
171                 }
172         case SHMDT:
173                 return sys_shmdt ((char __user *)ptr);
174         case SHMGET:
175                 return sys_shmget (first, second, third);
176         case SHMCTL:
177                 return sys_shmctl (first, second,
178                                    (struct shmid_ds __user *) ptr);
179         default:
180                 return -ENOSYS;
181         }
182 }
183
184 asmlinkage int sys_uname(struct old_utsname __user * name)
185 {
186         int err;
187         if (!name)
188                 return -EFAULT;
189         down_read(&uts_sem);
190         err = copy_to_user(name, utsname(), sizeof (*name));
191         up_read(&uts_sem);
192         return err?-EFAULT:0;
193 }
194
195 asmlinkage int sys_cacheflush(void *addr, int bytes, int cache)
196 {
197         /* This should flush more selectively ...  */
198         _flush_cache_all();
199         return 0;
200 }
201
202 asmlinkage int sys_cachectl(char *addr, int nbytes, int op)
203 {
204         /* Not implemented yet. */
205         return -ENOSYS;
206 }
207
208 /*
209  * Do a system call from kernel instead of calling sys_execve so we
210  * end up with proper pt_regs.
211  */
212 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
213 {
214         register long __scno __asm__ ("r7") = __NR_execve;
215         register long __arg3 __asm__ ("r2") = (long)(envp);
216         register long __arg2 __asm__ ("r1") = (long)(argv);
217         register long __res __asm__ ("r0") = (long)(filename);
218         __asm__ __volatile__ (
219                 "trap #" SYSCALL_VECTOR "|| nop"
220                 : "=r" (__res)
221                 : "r" (__scno), "0" (__res), "r" (__arg2),
222                         "r" (__arg3)
223                 : "memory");
224         return __res;
225 }