aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/syscalls.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/kernel/syscalls.c')
-rw-r--r--arch/powerpc/kernel/syscalls.c351
1 files changed, 351 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/syscalls.c b/arch/powerpc/kernel/syscalls.c
new file mode 100644
index 000000000000..3e3a4f67de96
--- /dev/null
+++ b/arch/powerpc/kernel/syscalls.c
@@ -0,0 +1,351 @@
1/*
2 * Implementation of various system calls for Linux/PowerPC
3 *
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 *
6 * Derived from "arch/i386/kernel/sys_i386.c"
7 * Adapted from the i386 version by Gary Thomas
8 * Modified by Cort Dougan (cort@cs.nmt.edu)
9 * and Paul Mackerras (paulus@cs.anu.edu.au).
10 *
11 * This file contains various random system calls that
12 * have a non-standard calling sequence on the Linux/PPC
13 * platform.
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 *
20 */
21
22#include <linux/errno.h>
23#include <linux/sched.h>
24#include <linux/syscalls.h>
25#include <linux/mm.h>
26#include <linux/smp.h>
27#include <linux/smp_lock.h>
28#include <linux/sem.h>
29#include <linux/msg.h>
30#include <linux/shm.h>
31#include <linux/stat.h>
32#include <linux/mman.h>
33#include <linux/sys.h>
34#include <linux/ipc.h>
35#include <linux/utsname.h>
36#include <linux/file.h>
37#include <linux/init.h>
38#include <linux/personality.h>
39
40#include <asm/uaccess.h>
41#include <asm/ipc.h>
42#include <asm/semaphore.h>
43#include <asm/time.h>
44#include <asm/unistd.h>
45
46extern unsigned long wall_jiffies;
47
48
49/*
50 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
51 *
52 * This is really horribly ugly.
53 */
54int sys_ipc(uint call, int first, unsigned long second, long third,
55 void __user *ptr, long fifth)
56{
57 int version, ret;
58
59 version = call >> 16; /* hack for backward compatibility */
60 call &= 0xffff;
61
62 ret = -ENOSYS;
63 switch (call) {
64 case SEMOP:
65 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
66 (unsigned)second, NULL);
67 break;
68 case SEMTIMEDOP:
69 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
70 (unsigned)second,
71 (const struct timespec __user *) fifth);
72 break;
73 case SEMGET:
74 ret = sys_semget (first, (int)second, third);
75 break;
76 case SEMCTL: {
77 union semun fourth;
78
79 ret = -EINVAL;
80 if (!ptr)
81 break;
82 if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
83 break;
84 ret = sys_semctl(first, (int)second, third, fourth);
85 break;
86 }
87 case MSGSND:
88 ret = sys_msgsnd(first, (struct msgbuf __user *)ptr,
89 (size_t)second, third);
90 break;
91 case MSGRCV:
92 switch (version) {
93 case 0: {
94 struct ipc_kludge tmp;
95
96 ret = -EINVAL;
97 if (!ptr)
98 break;
99 if ((ret = copy_from_user(&tmp,
100 (struct ipc_kludge __user *) ptr,
101 sizeof (tmp)) ? -EFAULT : 0))
102 break;
103 ret = sys_msgrcv(first, tmp.msgp, (size_t) second,
104 tmp.msgtyp, third);
105 break;
106 }
107 default:
108 ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
109 (size_t)second, fifth, third);
110 break;
111 }
112 break;
113 case MSGGET:
114 ret = sys_msgget((key_t)first, (int)second);
115 break;
116 case MSGCTL:
117 ret = sys_msgctl(first, (int)second,
118 (struct msqid_ds __user *)ptr);
119 break;
120 case SHMAT: {
121 ulong raddr;
122 ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr);
123 if (ret)
124 break;
125 ret = put_user(raddr, (ulong __user *) third);
126 break;
127 }
128 case SHMDT:
129 ret = sys_shmdt((char __user *)ptr);
130 break;
131 case SHMGET:
132 ret = sys_shmget(first, (size_t)second, third);
133 break;
134 case SHMCTL:
135 ret = sys_shmctl(first, (int)second,
136 (struct shmid_ds __user *)ptr);
137 break;
138 }
139
140 return ret;
141}
142
143/*
144 * sys_pipe() is the normal C calling standard for creating
145 * a pipe. It's not the way unix traditionally does this, though.
146 */
147int sys_pipe(int __user *fildes)
148{
149 int fd[2];
150 int error;
151
152 error = do_pipe(fd);
153 if (!error) {
154 if (copy_to_user(fildes, fd, 2*sizeof(int)))
155 error = -EFAULT;
156 }
157 return error;
158}
159
160static inline unsigned long do_mmap2(unsigned long addr, size_t len,
161 unsigned long prot, unsigned long flags,
162 unsigned long fd, unsigned long off, int shift)
163{
164 struct file * file = NULL;
165 int ret = -EINVAL;
166
167 if (shift) {
168 if (off & ((1 << shift) - 1))
169 goto out;
170 off >>= shift;
171 }
172
173 ret = -EBADF;
174 if (!(flags & MAP_ANONYMOUS)) {
175 if (!(file = fget(fd)))
176 goto out;
177 }
178
179 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
180
181 down_write(&current->mm->mmap_sem);
182 ret = do_mmap_pgoff(file, addr, len, prot, flags, off);
183 up_write(&current->mm->mmap_sem);
184 if (file)
185 fput(file);
186out:
187 return ret;
188}
189
190unsigned long sys_mmap2(unsigned long addr, size_t len,
191 unsigned long prot, unsigned long flags,
192 unsigned long fd, unsigned long pgoff)
193{
194 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
195}
196
197unsigned long sys_mmap(unsigned long addr, size_t len,
198 unsigned long prot, unsigned long flags,
199 unsigned long fd, off_t offset)
200{
201 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
202}
203
204#ifdef CONFIG_PPC32
205/*
206 * Due to some executables calling the wrong select we sometimes
207 * get wrong args. This determines how the args are being passed
208 * (a single ptr to them all args passed) then calls
209 * sys_select() with the appropriate args. -- Cort
210 */
211int
212ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
213{
214 if ( (unsigned long)n >= 4096 )
215 {
216 unsigned long __user *buffer = (unsigned long __user *)n;
217 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
218 || __get_user(n, buffer)
219 || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
220 || __get_user(outp, ((fd_set __user * __user *)(buffer+2)))
221 || __get_user(exp, ((fd_set __user * __user *)(buffer+3)))
222 || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4))))
223 return -EFAULT;
224 }
225 return sys_select(n, inp, outp, exp, tvp);
226}
227#endif
228
229#ifdef CONFIG_PPC64
230long ppc64_personality(unsigned long personality)
231{
232 long ret;
233
234 if (personality(current->personality) == PER_LINUX32
235 && personality == PER_LINUX)
236 personality = PER_LINUX32;
237 ret = sys_personality(personality);
238 if (ret == PER_LINUX32)
239 ret = PER_LINUX;
240 return ret;
241}
242#endif
243
244#ifdef CONFIG_PPC64
245#define OVERRIDE_MACHINE (personality(current->personality) == PER_LINUX32)
246#else
247#define OVERRIDE_MACHINE 0
248#endif
249
250static inline int override_machine(char *mach)
251{
252 if (OVERRIDE_MACHINE) {
253 /* change ppc64 to ppc */
254 if (__put_user(0, mach+3) || __put_user(0, mach+4))
255 return -EFAULT;
256 }
257 return 0;
258}
259
260long ppc_newuname(struct new_utsname __user * name)
261{
262 int err = 0;
263
264 down_read(&uts_sem);
265 if (copy_to_user(name, &system_utsname, sizeof(*name)))
266 err = -EFAULT;
267 up_read(&uts_sem);
268 if (!err)
269 err = override_machine(name->machine);
270 return err;
271}
272
273int sys_uname(struct old_utsname __user *name)
274{
275 int err = 0;
276
277 down_read(&uts_sem);
278 if (copy_to_user(name, &system_utsname, sizeof(*name)))
279 err = -EFAULT;
280 up_read(&uts_sem);
281 if (!err)
282 err = override_machine(name->machine);
283 return err;
284}
285
286int sys_olduname(struct oldold_utsname __user *name)
287{
288 int error;
289
290 if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
291 return -EFAULT;
292
293 down_read(&uts_sem);
294 error = __copy_to_user(&name->sysname, &system_utsname.sysname,
295 __OLD_UTS_LEN);
296 error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
297 error |= __copy_to_user(&name->nodename, &system_utsname.nodename,
298 __OLD_UTS_LEN);
299 error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
300 error |= __copy_to_user(&name->release, &system_utsname.release,
301 __OLD_UTS_LEN);
302 error |= __put_user(0, name->release + __OLD_UTS_LEN);
303 error |= __copy_to_user(&name->version, &system_utsname.version,
304 __OLD_UTS_LEN);
305 error |= __put_user(0, name->version + __OLD_UTS_LEN);
306 error |= __copy_to_user(&name->machine, &system_utsname.machine,
307 __OLD_UTS_LEN);
308 error |= override_machine(name->machine);
309 up_read(&uts_sem);
310
311 return error? -EFAULT: 0;
312}
313
314#ifdef CONFIG_PPC64
315time_t sys64_time(time_t __user * tloc)
316{
317 time_t secs;
318 time_t usecs;
319
320 long tb_delta = tb_ticks_since(tb_last_stamp);
321 tb_delta += (jiffies - wall_jiffies) * tb_ticks_per_jiffy;
322
323 secs = xtime.tv_sec;
324 usecs = (xtime.tv_nsec/1000) + tb_delta / tb_ticks_per_usec;
325 while (usecs >= USEC_PER_SEC) {
326 ++secs;
327 usecs -= USEC_PER_SEC;
328 }
329
330 if (tloc) {
331 if (put_user(secs,tloc))
332 secs = -EFAULT;
333 }
334
335 return secs;
336}
337#endif
338
339void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
340 unsigned long r6, unsigned long r7, unsigned long r8,
341 struct pt_regs *regs)
342{
343 printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
344 " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
345 current, smp_processor_id());
346}
347
348void do_show_syscall_exit(unsigned long r3)
349{
350 printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
351}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-18 09:42:01 -0500