diff options
author | Chris Zankel <czankel@tensilica.com> | 2005-06-24 01:01:16 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-24 03:05:21 -0400 |
commit | 5a0015d62668e64c8b6e02e360fbbea121bfd5e6 (patch) | |
tree | ed879f8cbe0efee21ad861f38c4024bdcf25df9b /arch/xtensa/kernel/syscalls.c | |
parent | 4bedea94545165364618d403d03b61d797acba0b (diff) |
[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 3
The attached patches provides part 3 of an architecture implementation for the
Tensilica Xtensa CPU series.
Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/xtensa/kernel/syscalls.c')
-rw-r--r-- | arch/xtensa/kernel/syscalls.c | 418 |
1 files changed, 418 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/syscalls.c b/arch/xtensa/kernel/syscalls.c new file mode 100644 index 000000000000..abc8ed6c7026 --- /dev/null +++ b/arch/xtensa/kernel/syscalls.c | |||
@@ -0,0 +1,418 @@ | |||
1 | /* | ||
2 | * arch/xtensa/kernel/syscall.c | ||
3 | * | ||
4 | * This file is subject to the terms and conditions of the GNU General Public | ||
5 | * License. See the file "COPYING" in the main directory of this archive | ||
6 | * for more details. | ||
7 | * | ||
8 | * Copyright (C) 2001 - 2005 Tensilica Inc. | ||
9 | * Copyright (C) 2000 Silicon Graphics, Inc. | ||
10 | * Copyright (C) 1995 - 2000 by Ralf Baechle | ||
11 | * | ||
12 | * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> | ||
13 | * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca> | ||
14 | * Chris Zankel <chris@zankel.net> | ||
15 | * Kevin Chea | ||
16 | * | ||
17 | */ | ||
18 | |||
19 | #define DEBUG 0 | ||
20 | |||
21 | #include <linux/config.h> | ||
22 | #include <linux/linkage.h> | ||
23 | #include <linux/mm.h> | ||
24 | #include <linux/smp.h> | ||
25 | #include <linux/smp_lock.h> | ||
26 | #include <linux/mman.h> | ||
27 | #include <linux/sched.h> | ||
28 | #include <linux/file.h> | ||
29 | #include <linux/slab.h> | ||
30 | #include <linux/utsname.h> | ||
31 | #include <linux/unistd.h> | ||
32 | #include <linux/stringify.h> | ||
33 | #include <linux/syscalls.h> | ||
34 | #include <linux/sem.h> | ||
35 | #include <linux/msg.h> | ||
36 | #include <linux/shm.h> | ||
37 | #include <linux/errno.h> | ||
38 | #include <asm/ptrace.h> | ||
39 | #include <asm/signal.h> | ||
40 | #include <asm/uaccess.h> | ||
41 | #include <asm/hardirq.h> | ||
42 | #include <asm/mman.h> | ||
43 | #include <asm/shmparam.h> | ||
44 | #include <asm/page.h> | ||
45 | #include <asm/ipc.h> | ||
46 | |||
47 | extern void do_syscall_trace(void); | ||
48 | typedef int (*syscall_t)(void *a0,...); | ||
49 | extern int (*do_syscalls)(struct pt_regs *regs, syscall_t fun, | ||
50 | int narg); | ||
51 | extern syscall_t sys_call_table[]; | ||
52 | extern unsigned char sys_narg_table[]; | ||
53 | |||
54 | /* | ||
55 | * sys_pipe() is the normal C calling standard for creating a pipe. It's not | ||
56 | * the way unix traditional does this, though. | ||
57 | */ | ||
58 | |||
59 | int sys_pipe(int __user *userfds) | ||
60 | { | ||
61 | int fd[2]; | ||
62 | int error; | ||
63 | |||
64 | error = do_pipe(fd); | ||
65 | if (!error) { | ||
66 | if (copy_to_user(userfds, fd, 2 * sizeof(int))) | ||
67 | error = -EFAULT; | ||
68 | } | ||
69 | return error; | ||
70 | } | ||
71 | |||
72 | /* | ||
73 | * Common code for old and new mmaps. | ||
74 | */ | ||
75 | |||
76 | static inline long do_mmap2(unsigned long addr, unsigned long len, | ||
77 | unsigned long prot, unsigned long flags, | ||
78 | unsigned long fd, unsigned long pgoff) | ||
79 | { | ||
80 | int error = -EBADF; | ||
81 | struct file * file = NULL; | ||
82 | |||
83 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | ||
84 | if (!(flags & MAP_ANONYMOUS)) { | ||
85 | file = fget(fd); | ||
86 | if (!file) | ||
87 | goto out; | ||
88 | } | ||
89 | |||
90 | down_write(¤t->mm->mmap_sem); | ||
91 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); | ||
92 | up_write(¤t->mm->mmap_sem); | ||
93 | |||
94 | if (file) | ||
95 | fput(file); | ||
96 | out: | ||
97 | return error; | ||
98 | } | ||
99 | |||
100 | unsigned long old_mmap(unsigned long addr, size_t len, int prot, | ||
101 | int flags, int fd, off_t offset) | ||
102 | { | ||
103 | return do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); | ||
104 | } | ||
105 | |||
106 | long sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, | ||
107 | unsigned long flags, unsigned long fd, unsigned long pgoff) | ||
108 | { | ||
109 | return do_mmap2(addr, len, prot, flags, fd, pgoff); | ||
110 | } | ||
111 | |||
112 | int sys_fork(struct pt_regs *regs) | ||
113 | { | ||
114 | return do_fork(SIGCHLD, regs->areg[1], regs, 0, NULL, NULL); | ||
115 | } | ||
116 | |||
117 | int sys_vfork(struct pt_regs *regs) | ||
118 | { | ||
119 | return do_fork(CLONE_VFORK|CLONE_VM|SIGCHLD, regs->areg[1], | ||
120 | regs, 0, NULL, NULL); | ||
121 | } | ||
122 | |||
123 | int sys_clone(struct pt_regs *regs) | ||
124 | { | ||
125 | unsigned long clone_flags; | ||
126 | unsigned long newsp; | ||
127 | int __user *parent_tidptr, *child_tidptr; | ||
128 | clone_flags = regs->areg[4]; | ||
129 | newsp = regs->areg[3]; | ||
130 | parent_tidptr = (int __user *)regs->areg[5]; | ||
131 | child_tidptr = (int __user *)regs->areg[6]; | ||
132 | if (!newsp) | ||
133 | newsp = regs->areg[1]; | ||
134 | return do_fork(clone_flags,newsp,regs,0,parent_tidptr,child_tidptr); | ||
135 | } | ||
136 | |||
137 | /* | ||
138 | * sys_execve() executes a new program. | ||
139 | */ | ||
140 | |||
141 | int sys_execve(struct pt_regs *regs) | ||
142 | { | ||
143 | int error; | ||
144 | char * filename; | ||
145 | |||
146 | filename = getname((char *) (long)regs->areg[5]); | ||
147 | error = PTR_ERR(filename); | ||
148 | if (IS_ERR(filename)) | ||
149 | goto out; | ||
150 | error = do_execve(filename, (char **) (long)regs->areg[3], | ||
151 | (char **) (long)regs->areg[4], regs); | ||
152 | putname(filename); | ||
153 | |||
154 | out: | ||
155 | return error; | ||
156 | } | ||
157 | |||
158 | int sys_uname(struct old_utsname * name) | ||
159 | { | ||
160 | if (name && !copy_to_user(name, &system_utsname, sizeof (*name))) | ||
161 | return 0; | ||
162 | return -EFAULT; | ||
163 | } | ||
164 | |||
165 | int sys_olduname(struct oldold_utsname * name) | ||
166 | { | ||
167 | int error; | ||
168 | |||
169 | if (!name) | ||
170 | return -EFAULT; | ||
171 | if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname))) | ||
172 | return -EFAULT; | ||
173 | |||
174 | error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN); | ||
175 | error -= __put_user(0,name->sysname+__OLD_UTS_LEN); | ||
176 | error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN); | ||
177 | error -= __put_user(0,name->nodename+__OLD_UTS_LEN); | ||
178 | error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN); | ||
179 | error -= __put_user(0,name->release+__OLD_UTS_LEN); | ||
180 | error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN); | ||
181 | error -= __put_user(0,name->version+__OLD_UTS_LEN); | ||
182 | error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN); | ||
183 | error -= __put_user(0,name->machine+__OLD_UTS_LEN); | ||
184 | |||
185 | return error ? -EFAULT : 0; | ||
186 | } | ||
187 | |||
188 | |||
189 | /* | ||
190 | * Build the string table for the builtin "poor man's strace". | ||
191 | */ | ||
192 | |||
193 | #if DEBUG | ||
194 | #define SYSCALL(fun, narg) #fun, | ||
195 | static char *sfnames[] = { | ||
196 | #include "syscalls.h" | ||
197 | }; | ||
198 | #undef SYS | ||
199 | #endif | ||
200 | |||
201 | void system_call (struct pt_regs *regs) | ||
202 | { | ||
203 | syscall_t syscall; | ||
204 | unsigned long parm0, parm1, parm2, parm3, parm4, parm5; | ||
205 | int nargs, res; | ||
206 | unsigned int syscallnr; | ||
207 | int ps; | ||
208 | |||
209 | #if DEBUG | ||
210 | int i; | ||
211 | unsigned long parms[6]; | ||
212 | char *sysname; | ||
213 | #endif | ||
214 | |||
215 | regs->syscall = regs->areg[2]; | ||
216 | |||
217 | do_syscall_trace(); | ||
218 | |||
219 | /* Have to load after syscall_trace because strace | ||
220 | * sometimes changes regs->syscall. | ||
221 | */ | ||
222 | syscallnr = regs->syscall; | ||
223 | |||
224 | parm0 = parm1 = parm2 = parm3 = parm4 = parm5 = 0; | ||
225 | |||
226 | /* Restore interrupt level to syscall invoker's. | ||
227 | * If this were in assembly, we wouldn't disable | ||
228 | * interrupts in the first place: | ||
229 | */ | ||
230 | local_save_flags (ps); | ||
231 | local_irq_restore((ps & ~XCHAL_PS_INTLEVEL_MASK) | | ||
232 | (regs->ps & XCHAL_PS_INTLEVEL_MASK) ); | ||
233 | |||
234 | if (syscallnr > __NR_Linux_syscalls) { | ||
235 | regs->areg[2] = -ENOSYS; | ||
236 | return; | ||
237 | } | ||
238 | |||
239 | syscall = sys_call_table[syscallnr]; | ||
240 | nargs = sys_narg_table[syscallnr]; | ||
241 | |||
242 | if (syscall == NULL) { | ||
243 | regs->areg[2] = -ENOSYS; | ||
244 | return; | ||
245 | } | ||
246 | |||
247 | /* There shouldn't be more than six arguments in the table! */ | ||
248 | |||
249 | if (nargs > 6) | ||
250 | panic("Internal error - too many syscall arguments (%d)!\n", | ||
251 | nargs); | ||
252 | |||
253 | /* Linux takes system-call arguments in registers. The ABI | ||
254 | * and Xtensa software conventions require the system-call | ||
255 | * number in a2. If an argument exists in a2, we move it to | ||
256 | * the next available register. Note that for improved | ||
257 | * efficiency, we do NOT shift all parameters down one | ||
258 | * register to maintain the original order. | ||
259 | * | ||
260 | * At best case (zero arguments), we just write the syscall | ||
261 | * number to a2. At worst case (1 to 6 arguments), we move | ||
262 | * the argument in a2 to the next available register, then | ||
263 | * write the syscall number to a2. | ||
264 | * | ||
265 | * For clarity, the following truth table enumerates all | ||
266 | * possibilities. | ||
267 | * | ||
268 | * arguments syscall number arg0, arg1, arg2, arg3, arg4, arg5 | ||
269 | * --------- -------------- ---------------------------------- | ||
270 | * 0 a2 | ||
271 | * 1 a2 a3 | ||
272 | * 2 a2 a4, a3 | ||
273 | * 3 a2 a5, a3, a4 | ||
274 | * 4 a2 a6, a3, a4, a5 | ||
275 | * 5 a2 a7, a3, a4, a5, a6 | ||
276 | * 6 a2 a8, a3, a4, a5, a6, a7 | ||
277 | */ | ||
278 | if (nargs) { | ||
279 | parm0 = regs->areg[nargs+2]; | ||
280 | parm1 = regs->areg[3]; | ||
281 | parm2 = regs->areg[4]; | ||
282 | parm3 = regs->areg[5]; | ||
283 | parm4 = regs->areg[6]; | ||
284 | parm5 = regs->areg[7]; | ||
285 | } else /* nargs == 0 */ | ||
286 | parm0 = (unsigned long) regs; | ||
287 | |||
288 | #if DEBUG | ||
289 | parms[0] = parm0; | ||
290 | parms[1] = parm1; | ||
291 | parms[2] = parm2; | ||
292 | parms[3] = parm3; | ||
293 | parms[4] = parm4; | ||
294 | parms[5] = parm5; | ||
295 | |||
296 | sysname = sfnames[syscallnr]; | ||
297 | if (strncmp(sysname, "sys_", 4) == 0) | ||
298 | sysname = sysname + 4; | ||
299 | |||
300 | printk("\017SYSCALL:I:%x:%d:%s %s(", regs->pc, current->pid, | ||
301 | current->comm, sysname); | ||
302 | for (i = 0; i < nargs; i++) | ||
303 | printk((i>0) ? ", %#lx" : "%#lx", parms[i]); | ||
304 | printk(")\n"); | ||
305 | #endif | ||
306 | |||
307 | res = syscall((void *)parm0, parm1, parm2, parm3, parm4, parm5); | ||
308 | |||
309 | #if DEBUG | ||
310 | printk("\017SYSCALL:O:%d:%s %s(",current->pid, current->comm, sysname); | ||
311 | for (i = 0; i < nargs; i++) | ||
312 | printk((i>0) ? ", %#lx" : "%#lx", parms[i]); | ||
313 | if (res < 4096) | ||
314 | printk(") = %d\n", res); | ||
315 | else | ||
316 | printk(") = %#x\n", res); | ||
317 | #endif /* DEBUG */ | ||
318 | |||
319 | regs->areg[2] = res; | ||
320 | do_syscall_trace(); | ||
321 | } | ||
322 | |||
323 | /* | ||
324 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | ||
325 | * | ||
326 | * This is really horribly ugly. | ||
327 | */ | ||
328 | |||
329 | int sys_ipc (uint call, int first, int second, | ||
330 | int third, void __user *ptr, long fifth) | ||
331 | { | ||
332 | int version, ret; | ||
333 | |||
334 | version = call >> 16; /* hack for backward compatibility */ | ||
335 | call &= 0xffff; | ||
336 | ret = -ENOSYS; | ||
337 | |||
338 | switch (call) { | ||
339 | case SEMOP: | ||
340 | ret = sys_semtimedop (first, (struct sembuf __user *)ptr, | ||
341 | second, NULL); | ||
342 | break; | ||
343 | |||
344 | case SEMTIMEDOP: | ||
345 | ret = sys_semtimedop (first, (struct sembuf __user *)ptr, | ||
346 | second, (const struct timespec *) fifth); | ||
347 | break; | ||
348 | |||
349 | case SEMGET: | ||
350 | ret = sys_semget (first, second, third); | ||
351 | break; | ||
352 | |||
353 | case SEMCTL: { | ||
354 | union semun fourth; | ||
355 | |||
356 | if (ptr && !get_user(fourth.__pad, (void *__user *) ptr)) | ||
357 | ret = sys_semctl (first, second, third, fourth); | ||
358 | break; | ||
359 | } | ||
360 | |||
361 | case MSGSND: | ||
362 | ret = sys_msgsnd (first, (struct msgbuf __user*) ptr, | ||
363 | second, third); | ||
364 | break; | ||
365 | |||
366 | case MSGRCV: | ||
367 | switch (version) { | ||
368 | case 0: { | ||
369 | struct ipc_kludge tmp; | ||
370 | |||
371 | if (ptr && !copy_from_user(&tmp, | ||
372 | (struct ipc_kludge *) ptr, | ||
373 | sizeof (tmp))) | ||
374 | ret = sys_msgrcv (first, tmp.msgp, second, | ||
375 | tmp.msgtyp, third); | ||
376 | break; | ||
377 | } | ||
378 | |||
379 | default: | ||
380 | ret = sys_msgrcv (first, (struct msgbuf __user *) ptr, | ||
381 | second, 0, third); | ||
382 | break; | ||
383 | } | ||
384 | break; | ||
385 | |||
386 | case MSGGET: | ||
387 | ret = sys_msgget ((key_t) first, second); | ||
388 | break; | ||
389 | |||
390 | case MSGCTL: | ||
391 | ret = sys_msgctl (first, second, (struct msqid_ds __user*) ptr); | ||
392 | break; | ||
393 | |||
394 | case SHMAT: { | ||
395 | ulong raddr; | ||
396 | ret = do_shmat (first, (char __user *) ptr, second, &raddr); | ||
397 | |||
398 | if (!ret) | ||
399 | ret = put_user (raddr, (ulong __user *) third); | ||
400 | |||
401 | break; | ||
402 | } | ||
403 | |||
404 | case SHMDT: | ||
405 | ret = sys_shmdt ((char __user *)ptr); | ||
406 | break; | ||
407 | |||
408 | case SHMGET: | ||
409 | ret = sys_shmget (first, second, third); | ||
410 | break; | ||
411 | |||
412 | case SHMCTL: | ||
413 | ret = sys_shmctl (first, second, (struct shmid_ds __user*) ptr); | ||
414 | break; | ||
415 | } | ||
416 | return ret; | ||
417 | } | ||
418 | |||