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/fs.h>
27 #include <linux/smp.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/syscalls.h>
42 #include <asm/time.h>
43 #include <asm/unistd.h>
44
45 /*
46 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
47 *
48 * This is really horribly ugly.
49 */
sys_ipc(uint call,int first,unsigned long second,long third,void __user * ptr,long fifth)50 int sys_ipc(uint call, int first, unsigned long second, long third,
51 void __user *ptr, long fifth)
52 {
53 int version, ret;
54
55 version = call >> 16; /* hack for backward compatibility */
56 call &= 0xffff;
57
58 ret = -ENOSYS;
59 switch (call) {
60 case SEMOP:
61 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
62 (unsigned)second, NULL);
63 break;
64 case SEMTIMEDOP:
65 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
66 (unsigned)second,
67 (const struct timespec __user *) fifth);
68 break;
69 case SEMGET:
70 ret = sys_semget (first, (int)second, third);
71 break;
72 case SEMCTL: {
73 union semun fourth;
74
75 ret = -EINVAL;
76 if (!ptr)
77 break;
78 if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
79 break;
80 ret = sys_semctl(first, (int)second, third, fourth);
81 break;
82 }
83 case MSGSND:
84 ret = sys_msgsnd(first, (struct msgbuf __user *)ptr,
85 (size_t)second, third);
86 break;
87 case MSGRCV:
88 switch (version) {
89 case 0: {
90 struct ipc_kludge tmp;
91
92 ret = -EINVAL;
93 if (!ptr)
94 break;
95 if ((ret = copy_from_user(&tmp,
96 (struct ipc_kludge __user *) ptr,
97 sizeof (tmp)) ? -EFAULT : 0))
98 break;
99 ret = sys_msgrcv(first, tmp.msgp, (size_t) second,
100 tmp.msgtyp, third);
101 break;
102 }
103 default:
104 ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
105 (size_t)second, fifth, third);
106 break;
107 }
108 break;
109 case MSGGET:
110 ret = sys_msgget((key_t)first, (int)second);
111 break;
112 case MSGCTL:
113 ret = sys_msgctl(first, (int)second,
114 (struct msqid_ds __user *)ptr);
115 break;
116 case SHMAT: {
117 ulong raddr;
118 ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr);
119 if (ret)
120 break;
121 ret = put_user(raddr, (ulong __user *) third);
122 break;
123 }
124 case SHMDT:
125 ret = sys_shmdt((char __user *)ptr);
126 break;
127 case SHMGET:
128 ret = sys_shmget(first, (size_t)second, third);
129 break;
130 case SHMCTL:
131 ret = sys_shmctl(first, (int)second,
132 (struct shmid_ds __user *)ptr);
133 break;
134 }
135
136 return ret;
137 }
138
do_mmap2(unsigned long addr,size_t len,unsigned long prot,unsigned long flags,unsigned long fd,unsigned long off,int shift)139 static inline unsigned long do_mmap2(unsigned long addr, size_t len,
140 unsigned long prot, unsigned long flags,
141 unsigned long fd, unsigned long off, int shift)
142 {
143 struct file * file = NULL;
144 unsigned long ret = -EINVAL;
145
146 if (!arch_validate_prot(prot))
147 goto out;
148
149 if (shift) {
150 if (off & ((1 << shift) - 1))
151 goto out;
152 off >>= shift;
153 }
154
155 ret = -EBADF;
156 if (!(flags & MAP_ANONYMOUS)) {
157 if (!(file = fget(fd)))
158 goto out;
159 }
160
161 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
162
163 down_write(¤t->mm->mmap_sem);
164 ret = do_mmap_pgoff(file, addr, len, prot, flags, off);
165 up_write(¤t->mm->mmap_sem);
166 if (file)
167 fput(file);
168 out:
169 return ret;
170 }
171
sys_mmap2(unsigned long addr,size_t len,unsigned long prot,unsigned long flags,unsigned long fd,unsigned long pgoff)172 unsigned long sys_mmap2(unsigned long addr, size_t len,
173 unsigned long prot, unsigned long flags,
174 unsigned long fd, unsigned long pgoff)
175 {
176 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
177 }
178
sys_mmap(unsigned long addr,size_t len,unsigned long prot,unsigned long flags,unsigned long fd,off_t offset)179 unsigned long sys_mmap(unsigned long addr, size_t len,
180 unsigned long prot, unsigned long flags,
181 unsigned long fd, off_t offset)
182 {
183 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
184 }
185
186 #ifdef CONFIG_PPC32
187 /*
188 * Due to some executables calling the wrong select we sometimes
189 * get wrong args. This determines how the args are being passed
190 * (a single ptr to them all args passed) then calls
191 * sys_select() with the appropriate args. -- Cort
192 */
193 int
ppc_select(int n,fd_set __user * inp,fd_set __user * outp,fd_set __user * exp,struct timeval __user * tvp)194 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
195 {
196 if ( (unsigned long)n >= 4096 )
197 {
198 unsigned long __user *buffer = (unsigned long __user *)n;
199 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
200 || __get_user(n, buffer)
201 || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
202 || __get_user(outp, ((fd_set __user * __user *)(buffer+2)))
203 || __get_user(exp, ((fd_set __user * __user *)(buffer+3)))
204 || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4))))
205 return -EFAULT;
206 }
207 return sys_select(n, inp, outp, exp, tvp);
208 }
209 #endif
210
211 #ifdef CONFIG_PPC64
ppc64_personality(unsigned long personality)212 long ppc64_personality(unsigned long personality)
213 {
214 long ret;
215
216 if (personality(current->personality) == PER_LINUX32
217 && personality == PER_LINUX)
218 personality = PER_LINUX32;
219 ret = sys_personality(personality);
220 if (ret == PER_LINUX32)
221 ret = PER_LINUX;
222 return ret;
223 }
224 #endif
225
226 #ifdef CONFIG_PPC64
227 #define OVERRIDE_MACHINE (personality(current->personality) == PER_LINUX32)
228 #else
229 #define OVERRIDE_MACHINE 0
230 #endif
231
override_machine(char __user * mach)232 static inline int override_machine(char __user *mach)
233 {
234 if (OVERRIDE_MACHINE) {
235 /* change ppc64 to ppc */
236 if (__put_user(0, mach+3) || __put_user(0, mach+4))
237 return -EFAULT;
238 }
239 return 0;
240 }
241
ppc_newuname(struct new_utsname __user * name)242 long ppc_newuname(struct new_utsname __user * name)
243 {
244 int err = 0;
245
246 down_read(&uts_sem);
247 if (copy_to_user(name, utsname(), sizeof(*name)))
248 err = -EFAULT;
249 up_read(&uts_sem);
250 if (!err)
251 err = override_machine(name->machine);
252 return err;
253 }
254
sys_uname(struct old_utsname __user * name)255 int sys_uname(struct old_utsname __user *name)
256 {
257 int err = 0;
258
259 down_read(&uts_sem);
260 if (copy_to_user(name, utsname(), sizeof(*name)))
261 err = -EFAULT;
262 up_read(&uts_sem);
263 if (!err)
264 err = override_machine(name->machine);
265 return err;
266 }
267
sys_olduname(struct oldold_utsname __user * name)268 int sys_olduname(struct oldold_utsname __user *name)
269 {
270 int error;
271
272 if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
273 return -EFAULT;
274
275 down_read(&uts_sem);
276 error = __copy_to_user(&name->sysname, &utsname()->sysname,
277 __OLD_UTS_LEN);
278 error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
279 error |= __copy_to_user(&name->nodename, &utsname()->nodename,
280 __OLD_UTS_LEN);
281 error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
282 error |= __copy_to_user(&name->release, &utsname()->release,
283 __OLD_UTS_LEN);
284 error |= __put_user(0, name->release + __OLD_UTS_LEN);
285 error |= __copy_to_user(&name->version, &utsname()->version,
286 __OLD_UTS_LEN);
287 error |= __put_user(0, name->version + __OLD_UTS_LEN);
288 error |= __copy_to_user(&name->machine, &utsname()->machine,
289 __OLD_UTS_LEN);
290 error |= override_machine(name->machine);
291 up_read(&uts_sem);
292
293 return error? -EFAULT: 0;
294 }
295
ppc_fadvise64_64(int fd,int advice,u32 offset_high,u32 offset_low,u32 len_high,u32 len_low)296 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
297 u32 len_high, u32 len_low)
298 {
299 return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
300 (u64)len_high << 32 | len_low, advice);
301 }
302
do_show_syscall(unsigned long r3,unsigned long r4,unsigned long r5,unsigned long r6,unsigned long r7,unsigned long r8,struct pt_regs * regs)303 void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
304 unsigned long r6, unsigned long r7, unsigned long r8,
305 struct pt_regs *regs)
306 {
307 printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
308 " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
309 current, smp_processor_id());
310 }
311
do_show_syscall_exit(unsigned long r3)312 void do_show_syscall_exit(unsigned long r3)
313 {
314 printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
315 }
316