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>
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>
40 #include <asm/uaccess.h>
41 #include <asm/semaphore.h>
42 #include <asm/syscalls.h>
44 #include <asm/unistd.h>
47 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
49 * This is really horribly ugly.
51 int sys_ipc(uint call, int first, unsigned long second, long third,
52 void __user *ptr, long fifth)
56 version = call >> 16; /* hack for backward compatibility */
62 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
63 (unsigned)second, NULL);
66 ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
68 (const struct timespec __user *) fifth);
71 ret = sys_semget (first, (int)second, third);
79 if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
81 ret = sys_semctl(first, (int)second, third, fourth);
85 ret = sys_msgsnd(first, (struct msgbuf __user *)ptr,
86 (size_t)second, third);
91 struct ipc_kludge tmp;
96 if ((ret = copy_from_user(&tmp,
97 (struct ipc_kludge __user *) ptr,
98 sizeof (tmp)) ? -EFAULT : 0))
100 ret = sys_msgrcv(first, tmp.msgp, (size_t) second,
105 ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
106 (size_t)second, fifth, third);
111 ret = sys_msgget((key_t)first, (int)second);
114 ret = sys_msgctl(first, (int)second,
115 (struct msqid_ds __user *)ptr);
119 ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr);
122 ret = put_user(raddr, (ulong __user *) third);
126 ret = sys_shmdt((char __user *)ptr);
129 ret = sys_shmget(first, (size_t)second, third);
132 ret = sys_shmctl(first, (int)second,
133 (struct shmid_ds __user *)ptr);
141 * sys_pipe() is the normal C calling standard for creating
142 * a pipe. It's not the way unix traditionally does this, though.
144 int sys_pipe(int __user *fildes)
151 if (copy_to_user(fildes, fd, 2*sizeof(int)))
157 static inline unsigned long do_mmap2(unsigned long addr, size_t len,
158 unsigned long prot, unsigned long flags,
159 unsigned long fd, unsigned long off, int shift)
161 struct file * file = NULL;
162 unsigned long ret = -EINVAL;
165 if (off & ((1 << shift) - 1))
171 if (!(flags & MAP_ANONYMOUS)) {
172 if (!(file = fget(fd)))
176 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
178 down_write(¤t->mm->mmap_sem);
179 ret = do_mmap_pgoff(file, addr, len, prot, flags, off);
180 up_write(¤t->mm->mmap_sem);
187 unsigned long sys_mmap2(unsigned long addr, size_t len,
188 unsigned long prot, unsigned long flags,
189 unsigned long fd, unsigned long pgoff)
191 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
194 unsigned long sys_mmap(unsigned long addr, size_t len,
195 unsigned long prot, unsigned long flags,
196 unsigned long fd, off_t offset)
198 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
203 * Due to some executables calling the wrong select we sometimes
204 * get wrong args. This determines how the args are being passed
205 * (a single ptr to them all args passed) then calls
206 * sys_select() with the appropriate args. -- Cort
209 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
211 if ( (unsigned long)n >= 4096 )
213 unsigned long __user *buffer = (unsigned long __user *)n;
214 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
215 || __get_user(n, buffer)
216 || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
217 || __get_user(outp, ((fd_set __user * __user *)(buffer+2)))
218 || __get_user(exp, ((fd_set __user * __user *)(buffer+3)))
219 || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4))))
222 return sys_select(n, inp, outp, exp, tvp);
227 long ppc64_personality(unsigned long personality)
231 if (personality(current->personality) == PER_LINUX32
232 && personality == PER_LINUX)
233 personality = PER_LINUX32;
234 ret = sys_personality(personality);
235 if (ret == PER_LINUX32)
242 #define OVERRIDE_MACHINE (personality(current->personality) == PER_LINUX32)
244 #define OVERRIDE_MACHINE 0
247 static inline int override_machine(char __user *mach)
249 if (OVERRIDE_MACHINE) {
250 /* change ppc64 to ppc */
251 if (__put_user(0, mach+3) || __put_user(0, mach+4))
257 long ppc_newuname(struct new_utsname __user * name)
262 if (copy_to_user(name, utsname(), sizeof(*name)))
266 err = override_machine(name->machine);
270 int sys_uname(struct old_utsname __user *name)
275 if (copy_to_user(name, utsname(), sizeof(*name)))
279 err = override_machine(name->machine);
283 int sys_olduname(struct oldold_utsname __user *name)
287 if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
291 error = __copy_to_user(&name->sysname, &utsname()->sysname,
293 error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
294 error |= __copy_to_user(&name->nodename, &utsname()->nodename,
296 error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
297 error |= __copy_to_user(&name->release, &utsname()->release,
299 error |= __put_user(0, name->release + __OLD_UTS_LEN);
300 error |= __copy_to_user(&name->version, &utsname()->version,
302 error |= __put_user(0, name->version + __OLD_UTS_LEN);
303 error |= __copy_to_user(&name->machine, &utsname()->machine,
305 error |= override_machine(name->machine);
308 return error? -EFAULT: 0;
311 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
312 u32 len_high, u32 len_low)
314 return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
315 (u64)len_high << 32 | len_low, advice);
318 void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
319 unsigned long r6, unsigned long r7, unsigned long r8,
320 struct pt_regs *regs)
322 printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
323 " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
324 current, smp_processor_id());
327 void do_show_syscall_exit(unsigned long r3)
329 printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());