Commit | Line | Data |
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1da177e4 LT |
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> | |
f3c25758 | 24 | #include <linux/module.h> |
26ff6c11 | 25 | #include <asm/cacheflush.h> |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | #include <asm/ipc.h> | |
28 | ||
29 | /* | |
30 | * sys_pipe() is the normal C calling standard for creating | |
31 | * a pipe. It's not the way Unix traditionally does this, though. | |
32 | */ | |
33 | asmlinkage int sys_pipe(unsigned long r4, unsigned long r5, | |
34 | unsigned long r6, unsigned long r7, | |
35 | struct pt_regs regs) | |
36 | { | |
37 | int fd[2]; | |
38 | int error; | |
39 | ||
40 | error = do_pipe(fd); | |
41 | if (!error) { | |
42 | regs.regs[1] = fd[1]; | |
43 | return fd[0]; | |
44 | } | |
45 | return error; | |
46 | } | |
47 | ||
f3c25758 PM |
48 | unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ |
49 | ||
50 | EXPORT_SYMBOL(shm_align_mask); | |
51 | ||
1da177e4 | 52 | /* |
f3c25758 | 53 | * To avoid cache aliases, we map the shared page with same color. |
1da177e4 | 54 | */ |
f3c25758 PM |
55 | #define COLOUR_ALIGN(addr, pgoff) \ |
56 | ((((addr) + shm_align_mask) & ~shm_align_mask) + \ | |
57 | (((pgoff) << PAGE_SHIFT) & shm_align_mask)) | |
1da177e4 LT |
58 | |
59 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, | |
60 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
61 | { | |
62 | struct mm_struct *mm = current->mm; | |
63 | struct vm_area_struct *vma; | |
64 | unsigned long start_addr; | |
f3c25758 | 65 | int do_colour_align; |
1da177e4 LT |
66 | |
67 | if (flags & MAP_FIXED) { | |
68 | /* We do not accept a shared mapping if it would violate | |
69 | * cache aliasing constraints. | |
70 | */ | |
f3c25758 | 71 | if ((flags & MAP_SHARED) && (addr & shm_align_mask)) |
1da177e4 LT |
72 | return -EINVAL; |
73 | return addr; | |
74 | } | |
75 | ||
f3c25758 | 76 | if (unlikely(len > TASK_SIZE)) |
1da177e4 LT |
77 | return -ENOMEM; |
78 | ||
f3c25758 PM |
79 | do_colour_align = 0; |
80 | if (filp || (flags & MAP_SHARED)) | |
81 | do_colour_align = 1; | |
82 | ||
1da177e4 | 83 | if (addr) { |
f3c25758 PM |
84 | if (do_colour_align) |
85 | addr = COLOUR_ALIGN(addr, pgoff); | |
1da177e4 | 86 | else |
f3c25758 PM |
87 | addr = PAGE_ALIGN(addr); |
88 | ||
1da177e4 LT |
89 | vma = find_vma(mm, addr); |
90 | if (TASK_SIZE - len >= addr && | |
91 | (!vma || addr + len <= vma->vm_start)) | |
92 | return addr; | |
93 | } | |
f3c25758 PM |
94 | |
95 | if (len > mm->cached_hole_size) { | |
96 | start_addr = addr = mm->free_area_cache; | |
97 | } else { | |
1363c3cd | 98 | mm->cached_hole_size = 0; |
f3c25758 | 99 | start_addr = addr = TASK_UNMAPPED_BASE; |
1363c3cd | 100 | } |
1da177e4 LT |
101 | |
102 | full_search: | |
f3c25758 PM |
103 | if (do_colour_align) |
104 | addr = COLOUR_ALIGN(addr, pgoff); | |
105 | else | |
106 | addr = PAGE_ALIGN(mm->free_area_cache); | |
107 | ||
1da177e4 LT |
108 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { |
109 | /* At this point: (!vma || addr < vma->vm_end). */ | |
f3c25758 | 110 | if (unlikely(TASK_SIZE - len < addr)) { |
1da177e4 LT |
111 | /* |
112 | * Start a new search - just in case we missed | |
113 | * some holes. | |
114 | */ | |
115 | if (start_addr != TASK_UNMAPPED_BASE) { | |
116 | start_addr = addr = TASK_UNMAPPED_BASE; | |
1363c3cd | 117 | mm->cached_hole_size = 0; |
1da177e4 LT |
118 | goto full_search; |
119 | } | |
120 | return -ENOMEM; | |
121 | } | |
f3c25758 | 122 | if (likely(!vma || addr + len <= vma->vm_start)) { |
1da177e4 LT |
123 | /* |
124 | * Remember the place where we stopped the search: | |
125 | */ | |
126 | mm->free_area_cache = addr + len; | |
127 | return addr; | |
128 | } | |
1363c3cd WW |
129 | if (addr + mm->cached_hole_size < vma->vm_start) |
130 | mm->cached_hole_size = vma->vm_start - addr; | |
131 | ||
1da177e4 | 132 | addr = vma->vm_end; |
f3c25758 PM |
133 | if (do_colour_align) |
134 | addr = COLOUR_ALIGN(addr, pgoff); | |
1da177e4 LT |
135 | } |
136 | } | |
1da177e4 LT |
137 | |
138 | static inline long | |
139 | do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, | |
140 | unsigned long flags, int fd, unsigned long pgoff) | |
141 | { | |
142 | int error = -EBADF; | |
143 | struct file *file = NULL; | |
144 | ||
145 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
146 | if (!(flags & MAP_ANONYMOUS)) { | |
147 | file = fget(fd); | |
148 | if (!file) | |
149 | goto out; | |
150 | } | |
151 | ||
152 | down_write(¤t->mm->mmap_sem); | |
153 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); | |
154 | up_write(¤t->mm->mmap_sem); | |
155 | ||
156 | if (file) | |
157 | fput(file); | |
158 | out: | |
159 | return error; | |
160 | } | |
161 | ||
162 | asmlinkage int old_mmap(unsigned long addr, unsigned long len, | |
163 | unsigned long prot, unsigned long flags, | |
164 | int fd, unsigned long off) | |
165 | { | |
166 | if (off & ~PAGE_MASK) | |
167 | return -EINVAL; | |
168 | return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT); | |
169 | } | |
170 | ||
171 | asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, | |
172 | unsigned long prot, unsigned long flags, | |
173 | unsigned long fd, unsigned long pgoff) | |
174 | { | |
175 | return do_mmap2(addr, len, prot, flags, fd, pgoff); | |
176 | } | |
177 | ||
178 | /* | |
179 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
180 | * | |
181 | * This is really horribly ugly. | |
182 | */ | |
183 | asmlinkage int sys_ipc(uint call, int first, int second, | |
184 | int third, void __user *ptr, long fifth) | |
185 | { | |
186 | int version, ret; | |
187 | ||
188 | version = call >> 16; /* hack for backward compatibility */ | |
189 | call &= 0xffff; | |
190 | ||
191 | if (call <= SEMCTL) | |
192 | switch (call) { | |
193 | case SEMOP: | |
194 | return sys_semtimedop(first, (struct sembuf __user *)ptr, | |
195 | second, NULL); | |
196 | case SEMTIMEDOP: | |
197 | return sys_semtimedop(first, (struct sembuf __user *)ptr, | |
198 | second, | |
199 | (const struct timespec __user *)fifth); | |
200 | case SEMGET: | |
201 | return sys_semget (first, second, third); | |
202 | case SEMCTL: { | |
203 | union semun fourth; | |
204 | if (!ptr) | |
205 | return -EINVAL; | |
206 | if (get_user(fourth.__pad, (void * __user *) ptr)) | |
207 | return -EFAULT; | |
208 | return sys_semctl (first, second, third, fourth); | |
209 | } | |
210 | default: | |
211 | return -EINVAL; | |
212 | } | |
213 | ||
214 | if (call <= MSGCTL) | |
215 | switch (call) { | |
216 | case MSGSND: | |
217 | return sys_msgsnd (first, (struct msgbuf __user *) ptr, | |
218 | second, third); | |
219 | case MSGRCV: | |
220 | switch (version) { | |
221 | case 0: { | |
222 | struct ipc_kludge tmp; | |
223 | if (!ptr) | |
224 | return -EINVAL; | |
225 | ||
226 | if (copy_from_user(&tmp, | |
227 | (struct ipc_kludge __user *) ptr, | |
228 | sizeof (tmp))) | |
229 | return -EFAULT; | |
230 | return sys_msgrcv (first, tmp.msgp, second, | |
231 | tmp.msgtyp, third); | |
232 | } | |
233 | default: | |
234 | return sys_msgrcv (first, | |
235 | (struct msgbuf __user *) ptr, | |
236 | second, fifth, third); | |
237 | } | |
238 | case MSGGET: | |
239 | return sys_msgget ((key_t) first, second); | |
240 | case MSGCTL: | |
241 | return sys_msgctl (first, second, | |
242 | (struct msqid_ds __user *) ptr); | |
243 | default: | |
244 | return -EINVAL; | |
245 | } | |
246 | if (call <= SHMCTL) | |
247 | switch (call) { | |
248 | case SHMAT: | |
249 | switch (version) { | |
250 | default: { | |
251 | ulong raddr; | |
252 | ret = do_shmat (first, (char __user *) ptr, | |
253 | second, &raddr); | |
254 | if (ret) | |
255 | return ret; | |
256 | return put_user (raddr, (ulong __user *) third); | |
257 | } | |
258 | case 1: /* iBCS2 emulator entry point */ | |
259 | if (!segment_eq(get_fs(), get_ds())) | |
260 | return -EINVAL; | |
261 | return do_shmat (first, (char __user *) ptr, | |
262 | second, (ulong *) third); | |
263 | } | |
264 | case SHMDT: | |
265 | return sys_shmdt ((char __user *)ptr); | |
266 | case SHMGET: | |
267 | return sys_shmget (first, second, third); | |
268 | case SHMCTL: | |
269 | return sys_shmctl (first, second, | |
270 | (struct shmid_ds __user *) ptr); | |
271 | default: | |
272 | return -EINVAL; | |
273 | } | |
274 | ||
275 | return -EINVAL; | |
276 | } | |
277 | ||
278 | asmlinkage int sys_uname(struct old_utsname * name) | |
279 | { | |
280 | int err; | |
281 | if (!name) | |
282 | return -EFAULT; | |
283 | down_read(&uts_sem); | |
e9ff3990 | 284 | err = copy_to_user(name, utsname(), sizeof (*name)); |
1da177e4 LT |
285 | up_read(&uts_sem); |
286 | return err?-EFAULT:0; | |
287 | } | |
288 | ||
289 | asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf, | |
290 | size_t count, long dummy, loff_t pos) | |
291 | { | |
292 | return sys_pread64(fd, buf, count, pos); | |
293 | } | |
294 | ||
295 | asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf, | |
296 | size_t count, long dummy, loff_t pos) | |
297 | { | |
298 | return sys_pwrite64(fd, buf, count, pos); | |
299 | } | |
300 | ||
301 | asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1, | |
302 | u32 len0, u32 len1, int advice) | |
303 | { | |
304 | #ifdef __LITTLE_ENDIAN__ | |
305 | return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0, | |
306 | (u64)len1 << 32 | len0, advice); | |
307 | #else | |
308 | return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1, | |
309 | (u64)len0 << 32 | len1, advice); | |
310 | #endif | |
311 | } |