2 * Implementation of various system calls for Linux/PowerPC
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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).
11 * This file contains various random system calls that
12 * have a non-standard calling sequence on the Linux/PPC
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.
22 #include <linux/errno.h>
23 #include <linux/sched.h>
24 #include <linux/syscalls.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>
40 #include <asm/uaccess.h>
42 #include <asm/semaphore.h>
44 #include <asm/unistd.h>
46 extern unsigned long wall_jiffies;
50 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
52 * This is really horribly ugly.
54 int sys_ipc(uint call, int first, unsigned long second, long third,
55 void __user *ptr, long fifth)
59 version = call >> 16; /* hack for backward compatibility */
65 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
66 (unsigned)second, NULL);
69 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
71 (const struct timespec __user *) fifth);
74 ret = sys_semget (first, (int)second, third);
82 if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
84 ret = sys_semctl(first, (int)second, third, fourth);
88 ret = sys_msgsnd(first, (struct msgbuf __user *)ptr,
89 (size_t)second, third);
94 struct ipc_kludge tmp;
99 if ((ret = copy_from_user(&tmp,
100 (struct ipc_kludge __user *) ptr,
101 sizeof (tmp)) ? -EFAULT : 0))
103 ret = sys_msgrcv(first, tmp.msgp, (size_t) second,
108 ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
109 (size_t)second, fifth, third);
114 ret = sys_msgget((key_t)first, (int)second);
117 ret = sys_msgctl(first, (int)second,
118 (struct msqid_ds __user *)ptr);
122 ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr);
125 ret = put_user(raddr, (ulong __user *) third);
129 ret = sys_shmdt((char __user *)ptr);
132 ret = sys_shmget(first, (size_t)second, third);
135 ret = sys_shmctl(first, (int)second,
136 (struct shmid_ds __user *)ptr);
144 * sys_pipe() is the normal C calling standard for creating
145 * a pipe. It's not the way unix traditionally does this, though.
147 int sys_pipe(int __user *fildes)
154 if (copy_to_user(fildes, fd, 2*sizeof(int)))
160 static 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)
164 struct file * file = NULL;
165 unsigned long ret = -EINVAL;
168 if (off & ((1 << shift) - 1))
174 if (!(flags & MAP_ANONYMOUS)) {
175 if (!(file = fget(fd)))
179 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
181 down_write(¤t->mm->mmap_sem);
182 ret = do_mmap_pgoff(file, addr, len, prot, flags, off);
183 up_write(¤t->mm->mmap_sem);
190 unsigned long sys_mmap2(unsigned long addr, size_t len,
191 unsigned long prot, unsigned long flags,
192 unsigned long fd, unsigned long pgoff)
194 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
197 unsigned long sys_mmap(unsigned long addr, size_t len,
198 unsigned long prot, unsigned long flags,
199 unsigned long fd, off_t offset)
201 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
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
212 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
214 if ( (unsigned long)n >= 4096 )
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))))
225 return sys_select(n, inp, outp, exp, tvp);
230 long ppc64_personality(unsigned long personality)
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)
245 #define OVERRIDE_MACHINE (personality(current->personality) == PER_LINUX32)
247 #define OVERRIDE_MACHINE 0
250 static inline int override_machine(char __user *mach)
252 if (OVERRIDE_MACHINE) {
253 /* change ppc64 to ppc */
254 if (__put_user(0, mach+3) || __put_user(0, mach+4))
260 long ppc_newuname(struct new_utsname __user * name)
265 if (copy_to_user(name, &system_utsname, sizeof(*name)))
269 err = override_machine(name->machine);
273 int sys_uname(struct old_utsname __user *name)
278 if (copy_to_user(name, &system_utsname, sizeof(*name)))
282 err = override_machine(name->machine);
286 int sys_olduname(struct oldold_utsname __user *name)
290 if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
294 error = __copy_to_user(&name->sysname, &system_utsname.sysname,
296 error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
297 error |= __copy_to_user(&name->nodename, &system_utsname.nodename,
299 error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
300 error |= __copy_to_user(&name->release, &system_utsname.release,
302 error |= __put_user(0, name->release + __OLD_UTS_LEN);
303 error |= __copy_to_user(&name->version, &system_utsname.version,
305 error |= __put_user(0, name->version + __OLD_UTS_LEN);
306 error |= __copy_to_user(&name->machine, &system_utsname.machine,
308 error |= override_machine(name->machine);
311 return error? -EFAULT: 0;
315 time_t sys64_time(time_t __user * tloc)
320 long tb_delta = tb_ticks_since(tb_last_stamp);
321 tb_delta += (jiffies - wall_jiffies) * tb_ticks_per_jiffy;
324 usecs = (xtime.tv_nsec/1000) + tb_delta / tb_ticks_per_usec;
325 while (usecs >= USEC_PER_SEC) {
327 usecs -= USEC_PER_SEC;
331 if (put_user(secs,tloc))
339 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
340 u32 len_high, u32 len_low)
342 return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
343 (u64)len_high << 32 | len_low, advice);
346 void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
347 unsigned long r6, unsigned long r7, unsigned long r8,
348 struct pt_regs *regs)
350 printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
351 " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
352 current, smp_processor_id());
355 void do_show_syscall_exit(unsigned long r3)
357 printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());