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> |
e06c4e57 | 24 | #include <linux/fs.h> |
cba4fbbf | 25 | #include <linux/ipc.h> |
26ff6c11 | 26 | #include <asm/cacheflush.h> |
1da177e4 | 27 | #include <asm/uaccess.h> |
fe74290d | 28 | #include <asm/unistd.h> |
1da177e4 LT |
29 | |
30 | /* | |
31 | * sys_pipe() is the normal C calling standard for creating | |
32 | * a pipe. It's not the way Unix traditionally does this, though. | |
33 | */ | |
34 | asmlinkage int sys_pipe(unsigned long r4, unsigned long r5, | |
35 | unsigned long r6, unsigned long r7, | |
f0bc814c | 36 | struct pt_regs __regs) |
1da177e4 | 37 | { |
f0bc814c | 38 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 LT |
39 | int fd[2]; |
40 | int error; | |
41 | ||
42 | error = do_pipe(fd); | |
43 | if (!error) { | |
f0bc814c | 44 | regs->regs[1] = fd[1]; |
1da177e4 LT |
45 | return fd[0]; |
46 | } | |
47 | return error; | |
48 | } | |
49 | ||
f3c25758 PM |
50 | unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ |
51 | ||
52 | EXPORT_SYMBOL(shm_align_mask); | |
53 | ||
710ee0cc | 54 | #ifdef CONFIG_MMU |
1da177e4 | 55 | /* |
f3c25758 | 56 | * To avoid cache aliases, we map the shared page with same color. |
1da177e4 | 57 | */ |
f3c25758 PM |
58 | #define COLOUR_ALIGN(addr, pgoff) \ |
59 | ((((addr) + shm_align_mask) & ~shm_align_mask) + \ | |
60 | (((pgoff) << PAGE_SHIFT) & shm_align_mask)) | |
1da177e4 LT |
61 | |
62 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, | |
63 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
64 | { | |
65 | struct mm_struct *mm = current->mm; | |
66 | struct vm_area_struct *vma; | |
67 | unsigned long start_addr; | |
f3c25758 | 68 | int do_colour_align; |
1da177e4 LT |
69 | |
70 | if (flags & MAP_FIXED) { | |
71 | /* We do not accept a shared mapping if it would violate | |
72 | * cache aliasing constraints. | |
73 | */ | |
f3c25758 | 74 | if ((flags & MAP_SHARED) && (addr & shm_align_mask)) |
1da177e4 LT |
75 | return -EINVAL; |
76 | return addr; | |
77 | } | |
78 | ||
f3c25758 | 79 | if (unlikely(len > TASK_SIZE)) |
1da177e4 LT |
80 | return -ENOMEM; |
81 | ||
f3c25758 PM |
82 | do_colour_align = 0; |
83 | if (filp || (flags & MAP_SHARED)) | |
84 | do_colour_align = 1; | |
85 | ||
1da177e4 | 86 | if (addr) { |
f3c25758 PM |
87 | if (do_colour_align) |
88 | addr = COLOUR_ALIGN(addr, pgoff); | |
1da177e4 | 89 | else |
f3c25758 PM |
90 | addr = PAGE_ALIGN(addr); |
91 | ||
1da177e4 LT |
92 | vma = find_vma(mm, addr); |
93 | if (TASK_SIZE - len >= addr && | |
94 | (!vma || addr + len <= vma->vm_start)) | |
95 | return addr; | |
96 | } | |
f3c25758 PM |
97 | |
98 | if (len > mm->cached_hole_size) { | |
99 | start_addr = addr = mm->free_area_cache; | |
100 | } else { | |
1363c3cd | 101 | mm->cached_hole_size = 0; |
f3c25758 | 102 | start_addr = addr = TASK_UNMAPPED_BASE; |
1363c3cd | 103 | } |
1da177e4 LT |
104 | |
105 | full_search: | |
f3c25758 PM |
106 | if (do_colour_align) |
107 | addr = COLOUR_ALIGN(addr, pgoff); | |
108 | else | |
109 | addr = PAGE_ALIGN(mm->free_area_cache); | |
110 | ||
1da177e4 LT |
111 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { |
112 | /* At this point: (!vma || addr < vma->vm_end). */ | |
f3c25758 | 113 | if (unlikely(TASK_SIZE - len < addr)) { |
1da177e4 LT |
114 | /* |
115 | * Start a new search - just in case we missed | |
116 | * some holes. | |
117 | */ | |
118 | if (start_addr != TASK_UNMAPPED_BASE) { | |
119 | start_addr = addr = TASK_UNMAPPED_BASE; | |
1363c3cd | 120 | mm->cached_hole_size = 0; |
1da177e4 LT |
121 | goto full_search; |
122 | } | |
123 | return -ENOMEM; | |
124 | } | |
f3c25758 | 125 | if (likely(!vma || addr + len <= vma->vm_start)) { |
1da177e4 LT |
126 | /* |
127 | * Remember the place where we stopped the search: | |
128 | */ | |
129 | mm->free_area_cache = addr + len; | |
130 | return addr; | |
131 | } | |
1363c3cd WW |
132 | if (addr + mm->cached_hole_size < vma->vm_start) |
133 | mm->cached_hole_size = vma->vm_start - addr; | |
134 | ||
1da177e4 | 135 | addr = vma->vm_end; |
f3c25758 PM |
136 | if (do_colour_align) |
137 | addr = COLOUR_ALIGN(addr, pgoff); | |
1da177e4 LT |
138 | } |
139 | } | |
710ee0cc | 140 | #endif /* CONFIG_MMU */ |
1da177e4 LT |
141 | |
142 | static inline long | |
143 | do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, | |
144 | unsigned long flags, int fd, unsigned long pgoff) | |
145 | { | |
146 | int error = -EBADF; | |
147 | struct file *file = NULL; | |
148 | ||
149 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
150 | if (!(flags & MAP_ANONYMOUS)) { | |
151 | file = fget(fd); | |
152 | if (!file) | |
153 | goto out; | |
154 | } | |
155 | ||
156 | down_write(¤t->mm->mmap_sem); | |
157 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); | |
158 | up_write(¤t->mm->mmap_sem); | |
159 | ||
160 | if (file) | |
161 | fput(file); | |
162 | out: | |
163 | return error; | |
164 | } | |
165 | ||
166 | asmlinkage int old_mmap(unsigned long addr, unsigned long len, | |
167 | unsigned long prot, unsigned long flags, | |
168 | int fd, unsigned long off) | |
169 | { | |
170 | if (off & ~PAGE_MASK) | |
171 | return -EINVAL; | |
172 | return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT); | |
173 | } | |
174 | ||
175 | asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, | |
176 | unsigned long prot, unsigned long flags, | |
177 | unsigned long fd, unsigned long pgoff) | |
178 | { | |
179 | return do_mmap2(addr, len, prot, flags, fd, pgoff); | |
180 | } | |
181 | ||
182 | /* | |
183 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
184 | * | |
185 | * This is really horribly ugly. | |
186 | */ | |
187 | asmlinkage int sys_ipc(uint call, int first, int second, | |
188 | int third, void __user *ptr, long fifth) | |
189 | { | |
190 | int version, ret; | |
191 | ||
192 | version = call >> 16; /* hack for backward compatibility */ | |
193 | call &= 0xffff; | |
194 | ||
195 | if (call <= SEMCTL) | |
196 | switch (call) { | |
197 | case SEMOP: | |
198 | return sys_semtimedop(first, (struct sembuf __user *)ptr, | |
199 | second, NULL); | |
200 | case SEMTIMEDOP: | |
201 | return sys_semtimedop(first, (struct sembuf __user *)ptr, | |
202 | second, | |
203 | (const struct timespec __user *)fifth); | |
204 | case SEMGET: | |
205 | return sys_semget (first, second, third); | |
206 | case SEMCTL: { | |
207 | union semun fourth; | |
208 | if (!ptr) | |
209 | return -EINVAL; | |
210 | if (get_user(fourth.__pad, (void * __user *) ptr)) | |
211 | return -EFAULT; | |
212 | return sys_semctl (first, second, third, fourth); | |
213 | } | |
214 | default: | |
215 | return -EINVAL; | |
216 | } | |
217 | ||
218 | if (call <= MSGCTL) | |
219 | switch (call) { | |
220 | case MSGSND: | |
221 | return sys_msgsnd (first, (struct msgbuf __user *) ptr, | |
222 | second, third); | |
223 | case MSGRCV: | |
224 | switch (version) { | |
225 | case 0: { | |
226 | struct ipc_kludge tmp; | |
227 | if (!ptr) | |
228 | return -EINVAL; | |
229 | ||
230 | if (copy_from_user(&tmp, | |
231 | (struct ipc_kludge __user *) ptr, | |
232 | sizeof (tmp))) | |
233 | return -EFAULT; | |
234 | return sys_msgrcv (first, tmp.msgp, second, | |
235 | tmp.msgtyp, third); | |
236 | } | |
237 | default: | |
238 | return sys_msgrcv (first, | |
239 | (struct msgbuf __user *) ptr, | |
240 | second, fifth, third); | |
241 | } | |
242 | case MSGGET: | |
243 | return sys_msgget ((key_t) first, second); | |
244 | case MSGCTL: | |
245 | return sys_msgctl (first, second, | |
246 | (struct msqid_ds __user *) ptr); | |
247 | default: | |
248 | return -EINVAL; | |
249 | } | |
250 | if (call <= SHMCTL) | |
251 | switch (call) { | |
252 | case SHMAT: | |
253 | switch (version) { | |
254 | default: { | |
255 | ulong raddr; | |
256 | ret = do_shmat (first, (char __user *) ptr, | |
257 | second, &raddr); | |
258 | if (ret) | |
259 | return ret; | |
260 | return put_user (raddr, (ulong __user *) third); | |
261 | } | |
262 | case 1: /* iBCS2 emulator entry point */ | |
263 | if (!segment_eq(get_fs(), get_ds())) | |
264 | return -EINVAL; | |
265 | return do_shmat (first, (char __user *) ptr, | |
266 | second, (ulong *) third); | |
267 | } | |
268 | case SHMDT: | |
269 | return sys_shmdt ((char __user *)ptr); | |
270 | case SHMGET: | |
271 | return sys_shmget (first, second, third); | |
272 | case SHMCTL: | |
273 | return sys_shmctl (first, second, | |
274 | (struct shmid_ds __user *) ptr); | |
275 | default: | |
276 | return -EINVAL; | |
277 | } | |
278 | ||
279 | return -EINVAL; | |
280 | } | |
281 | ||
282 | asmlinkage int sys_uname(struct old_utsname * name) | |
283 | { | |
284 | int err; | |
285 | if (!name) | |
286 | return -EFAULT; | |
287 | down_read(&uts_sem); | |
e9ff3990 | 288 | err = copy_to_user(name, utsname(), sizeof (*name)); |
1da177e4 LT |
289 | up_read(&uts_sem); |
290 | return err?-EFAULT:0; | |
291 | } | |
292 | ||
293 | asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf, | |
294 | size_t count, long dummy, loff_t pos) | |
295 | { | |
296 | return sys_pread64(fd, buf, count, pos); | |
297 | } | |
298 | ||
299 | asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf, | |
300 | size_t count, long dummy, loff_t pos) | |
301 | { | |
302 | return sys_pwrite64(fd, buf, count, pos); | |
303 | } | |
304 | ||
305 | asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1, | |
306 | u32 len0, u32 len1, int advice) | |
307 | { | |
308 | #ifdef __LITTLE_ENDIAN__ | |
309 | return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0, | |
310 | (u64)len1 << 32 | len0, advice); | |
311 | #else | |
312 | return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1, | |
313 | (u64)len0 << 32 | len1, advice); | |
314 | #endif | |
315 | } | |
fe74290d | 316 | |
79890c51 PM |
317 | #if defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH2A) |
318 | #define SYSCALL_ARG3 "trapa #0x23" | |
319 | #else | |
320 | #define SYSCALL_ARG3 "trapa #0x13" | |
321 | #endif | |
322 | ||
fe74290d AB |
323 | /* |
324 | * Do a system call from kernel instead of calling sys_execve so we | |
325 | * end up with proper pt_regs. | |
326 | */ | |
327 | int kernel_execve(const char *filename, char *const argv[], char *const envp[]) | |
328 | { | |
329 | register long __sc0 __asm__ ("r3") = __NR_execve; | |
330 | register long __sc4 __asm__ ("r4") = (long) filename; | |
331 | register long __sc5 __asm__ ("r5") = (long) argv; | |
332 | register long __sc6 __asm__ ("r6") = (long) envp; | |
11cbb70e | 333 | __asm__ __volatile__ (SYSCALL_ARG3 : "=z" (__sc0) |
fe74290d AB |
334 | : "0" (__sc0), "r" (__sc4), "r" (__sc5), "r" (__sc6) |
335 | : "memory"); | |
336 | return __sc0; | |
337 | } |