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> | |
1da177e4 LT |
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> | |
f3c25758 | 23 | #include <linux/module.h> |
26ff6c11 | 24 | #include <asm/cacheflush.h> |
1da177e4 LT |
25 | #include <asm/uaccess.h> |
26 | #include <asm/ipc.h> | |
fe74290d | 27 | #include <asm/unistd.h> |
1da177e4 LT |
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, | |
f0bc814c | 35 | struct pt_regs __regs) |
1da177e4 | 36 | { |
f0bc814c | 37 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 LT |
38 | int fd[2]; |
39 | int error; | |
40 | ||
41 | error = do_pipe(fd); | |
42 | if (!error) { | |
f0bc814c | 43 | regs->regs[1] = fd[1]; |
1da177e4 LT |
44 | return fd[0]; |
45 | } | |
46 | return error; | |
47 | } | |
48 | ||
f3c25758 PM |
49 | unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ |
50 | ||
51 | EXPORT_SYMBOL(shm_align_mask); | |
52 | ||
710ee0cc | 53 | #ifdef CONFIG_MMU |
1da177e4 | 54 | /* |
f3c25758 | 55 | * To avoid cache aliases, we map the shared page with same color. |
1da177e4 | 56 | */ |
f3c25758 PM |
57 | #define COLOUR_ALIGN(addr, pgoff) \ |
58 | ((((addr) + shm_align_mask) & ~shm_align_mask) + \ | |
59 | (((pgoff) << PAGE_SHIFT) & shm_align_mask)) | |
1da177e4 LT |
60 | |
61 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, | |
62 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
63 | { | |
64 | struct mm_struct *mm = current->mm; | |
65 | struct vm_area_struct *vma; | |
66 | unsigned long start_addr; | |
f3c25758 | 67 | int do_colour_align; |
1da177e4 LT |
68 | |
69 | if (flags & MAP_FIXED) { | |
70 | /* We do not accept a shared mapping if it would violate | |
71 | * cache aliasing constraints. | |
72 | */ | |
f3c25758 | 73 | if ((flags & MAP_SHARED) && (addr & shm_align_mask)) |
1da177e4 LT |
74 | return -EINVAL; |
75 | return addr; | |
76 | } | |
77 | ||
f3c25758 | 78 | if (unlikely(len > TASK_SIZE)) |
1da177e4 LT |
79 | return -ENOMEM; |
80 | ||
f3c25758 PM |
81 | do_colour_align = 0; |
82 | if (filp || (flags & MAP_SHARED)) | |
83 | do_colour_align = 1; | |
84 | ||
1da177e4 | 85 | if (addr) { |
f3c25758 PM |
86 | if (do_colour_align) |
87 | addr = COLOUR_ALIGN(addr, pgoff); | |
1da177e4 | 88 | else |
f3c25758 PM |
89 | addr = PAGE_ALIGN(addr); |
90 | ||
1da177e4 LT |
91 | vma = find_vma(mm, addr); |
92 | if (TASK_SIZE - len >= addr && | |
93 | (!vma || addr + len <= vma->vm_start)) | |
94 | return addr; | |
95 | } | |
f3c25758 PM |
96 | |
97 | if (len > mm->cached_hole_size) { | |
98 | start_addr = addr = mm->free_area_cache; | |
99 | } else { | |
1363c3cd | 100 | mm->cached_hole_size = 0; |
f3c25758 | 101 | start_addr = addr = TASK_UNMAPPED_BASE; |
1363c3cd | 102 | } |
1da177e4 LT |
103 | |
104 | full_search: | |
f3c25758 PM |
105 | if (do_colour_align) |
106 | addr = COLOUR_ALIGN(addr, pgoff); | |
107 | else | |
108 | addr = PAGE_ALIGN(mm->free_area_cache); | |
109 | ||
1da177e4 LT |
110 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { |
111 | /* At this point: (!vma || addr < vma->vm_end). */ | |
f3c25758 | 112 | if (unlikely(TASK_SIZE - len < addr)) { |
1da177e4 LT |
113 | /* |
114 | * Start a new search - just in case we missed | |
115 | * some holes. | |
116 | */ | |
117 | if (start_addr != TASK_UNMAPPED_BASE) { | |
118 | start_addr = addr = TASK_UNMAPPED_BASE; | |
1363c3cd | 119 | mm->cached_hole_size = 0; |
1da177e4 LT |
120 | goto full_search; |
121 | } | |
122 | return -ENOMEM; | |
123 | } | |
f3c25758 | 124 | if (likely(!vma || addr + len <= vma->vm_start)) { |
1da177e4 LT |
125 | /* |
126 | * Remember the place where we stopped the search: | |
127 | */ | |
128 | mm->free_area_cache = addr + len; | |
129 | return addr; | |
130 | } | |
1363c3cd WW |
131 | if (addr + mm->cached_hole_size < vma->vm_start) |
132 | mm->cached_hole_size = vma->vm_start - addr; | |
133 | ||
1da177e4 | 134 | addr = vma->vm_end; |
f3c25758 PM |
135 | if (do_colour_align) |
136 | addr = COLOUR_ALIGN(addr, pgoff); | |
1da177e4 LT |
137 | } |
138 | } | |
710ee0cc | 139 | #endif /* CONFIG_MMU */ |
1da177e4 LT |
140 | |
141 | static inline long | |
142 | do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, | |
143 | unsigned long flags, int fd, unsigned long pgoff) | |
144 | { | |
145 | int error = -EBADF; | |
146 | struct file *file = NULL; | |
147 | ||
148 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
149 | if (!(flags & MAP_ANONYMOUS)) { | |
150 | file = fget(fd); | |
151 | if (!file) | |
152 | goto out; | |
153 | } | |
154 | ||
155 | down_write(¤t->mm->mmap_sem); | |
156 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); | |
157 | up_write(¤t->mm->mmap_sem); | |
158 | ||
159 | if (file) | |
160 | fput(file); | |
161 | out: | |
162 | return error; | |
163 | } | |
164 | ||
165 | asmlinkage int old_mmap(unsigned long addr, unsigned long len, | |
166 | unsigned long prot, unsigned long flags, | |
167 | int fd, unsigned long off) | |
168 | { | |
169 | if (off & ~PAGE_MASK) | |
170 | return -EINVAL; | |
171 | return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT); | |
172 | } | |
173 | ||
174 | asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, | |
175 | unsigned long prot, unsigned long flags, | |
176 | unsigned long fd, unsigned long pgoff) | |
177 | { | |
178 | return do_mmap2(addr, len, prot, flags, fd, pgoff); | |
179 | } | |
180 | ||
181 | /* | |
182 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
183 | * | |
184 | * This is really horribly ugly. | |
185 | */ | |
186 | asmlinkage int sys_ipc(uint call, int first, int second, | |
187 | int third, void __user *ptr, long fifth) | |
188 | { | |
189 | int version, ret; | |
190 | ||
191 | version = call >> 16; /* hack for backward compatibility */ | |
192 | call &= 0xffff; | |
193 | ||
194 | if (call <= SEMCTL) | |
195 | switch (call) { | |
196 | case SEMOP: | |
197 | return sys_semtimedop(first, (struct sembuf __user *)ptr, | |
198 | second, NULL); | |
199 | case SEMTIMEDOP: | |
200 | return sys_semtimedop(first, (struct sembuf __user *)ptr, | |
201 | second, | |
202 | (const struct timespec __user *)fifth); | |
203 | case SEMGET: | |
204 | return sys_semget (first, second, third); | |
205 | case SEMCTL: { | |
206 | union semun fourth; | |
207 | if (!ptr) | |
208 | return -EINVAL; | |
209 | if (get_user(fourth.__pad, (void * __user *) ptr)) | |
210 | return -EFAULT; | |
211 | return sys_semctl (first, second, third, fourth); | |
212 | } | |
213 | default: | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
217 | if (call <= MSGCTL) | |
218 | switch (call) { | |
219 | case MSGSND: | |
220 | return sys_msgsnd (first, (struct msgbuf __user *) ptr, | |
221 | second, third); | |
222 | case MSGRCV: | |
223 | switch (version) { | |
224 | case 0: { | |
225 | struct ipc_kludge tmp; | |
226 | if (!ptr) | |
227 | return -EINVAL; | |
228 | ||
229 | if (copy_from_user(&tmp, | |
230 | (struct ipc_kludge __user *) ptr, | |
231 | sizeof (tmp))) | |
232 | return -EFAULT; | |
233 | return sys_msgrcv (first, tmp.msgp, second, | |
234 | tmp.msgtyp, third); | |
235 | } | |
236 | default: | |
237 | return sys_msgrcv (first, | |
238 | (struct msgbuf __user *) ptr, | |
239 | second, fifth, third); | |
240 | } | |
241 | case MSGGET: | |
242 | return sys_msgget ((key_t) first, second); | |
243 | case MSGCTL: | |
244 | return sys_msgctl (first, second, | |
245 | (struct msqid_ds __user *) ptr); | |
246 | default: | |
247 | return -EINVAL; | |
248 | } | |
249 | if (call <= SHMCTL) | |
250 | switch (call) { | |
251 | case SHMAT: | |
252 | switch (version) { | |
253 | default: { | |
254 | ulong raddr; | |
255 | ret = do_shmat (first, (char __user *) ptr, | |
256 | second, &raddr); | |
257 | if (ret) | |
258 | return ret; | |
259 | return put_user (raddr, (ulong __user *) third); | |
260 | } | |
261 | case 1: /* iBCS2 emulator entry point */ | |
262 | if (!segment_eq(get_fs(), get_ds())) | |
263 | return -EINVAL; | |
264 | return do_shmat (first, (char __user *) ptr, | |
265 | second, (ulong *) third); | |
266 | } | |
267 | case SHMDT: | |
268 | return sys_shmdt ((char __user *)ptr); | |
269 | case SHMGET: | |
270 | return sys_shmget (first, second, third); | |
271 | case SHMCTL: | |
272 | return sys_shmctl (first, second, | |
273 | (struct shmid_ds __user *) ptr); | |
274 | default: | |
275 | return -EINVAL; | |
276 | } | |
277 | ||
278 | return -EINVAL; | |
279 | } | |
280 | ||
281 | asmlinkage int sys_uname(struct old_utsname * name) | |
282 | { | |
283 | int err; | |
284 | if (!name) | |
285 | return -EFAULT; | |
286 | down_read(&uts_sem); | |
e9ff3990 | 287 | err = copy_to_user(name, utsname(), sizeof (*name)); |
1da177e4 LT |
288 | up_read(&uts_sem); |
289 | return err?-EFAULT:0; | |
290 | } | |
291 | ||
292 | asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf, | |
293 | size_t count, long dummy, loff_t pos) | |
294 | { | |
295 | return sys_pread64(fd, buf, count, pos); | |
296 | } | |
297 | ||
298 | asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf, | |
299 | size_t count, long dummy, loff_t pos) | |
300 | { | |
301 | return sys_pwrite64(fd, buf, count, pos); | |
302 | } | |
303 | ||
304 | asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1, | |
305 | u32 len0, u32 len1, int advice) | |
306 | { | |
307 | #ifdef __LITTLE_ENDIAN__ | |
308 | return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0, | |
309 | (u64)len1 << 32 | len0, advice); | |
310 | #else | |
311 | return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1, | |
312 | (u64)len0 << 32 | len1, advice); | |
313 | #endif | |
314 | } | |
fe74290d | 315 | |
79890c51 PM |
316 | #if defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH2A) |
317 | #define SYSCALL_ARG3 "trapa #0x23" | |
318 | #else | |
319 | #define SYSCALL_ARG3 "trapa #0x13" | |
320 | #endif | |
321 | ||
fe74290d AB |
322 | /* |
323 | * Do a system call from kernel instead of calling sys_execve so we | |
324 | * end up with proper pt_regs. | |
325 | */ | |
326 | int kernel_execve(const char *filename, char *const argv[], char *const envp[]) | |
327 | { | |
328 | register long __sc0 __asm__ ("r3") = __NR_execve; | |
329 | register long __sc4 __asm__ ("r4") = (long) filename; | |
330 | register long __sc5 __asm__ ("r5") = (long) argv; | |
331 | register long __sc6 __asm__ ("r6") = (long) envp; | |
11cbb70e | 332 | __asm__ __volatile__ (SYSCALL_ARG3 : "=z" (__sc0) |
fe74290d AB |
333 | : "0" (__sc0), "r" (__sc4), "r" (__sc5), "r" (__sc6) |
334 | : "memory"); | |
335 | return __sc0; | |
336 | } |