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/arch/ppc64/kernel/syscalls.c

https://bitbucket.org/evzijst/gittest
C | 258 lines | 200 code | 28 blank | 30 comment | 20 complexity | d1106bde546956557c37df3d626fa603 MD5 | raw file
  1/*
  2 * linux/arch/ppc64/kernel/sys_ppc.c
  3 *
  4 *  PowerPC version 
  5 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  6 *
  7 * Derived from "arch/i386/kernel/sys_i386.c"
  8 * Adapted from the i386 version by Gary Thomas
  9 * Modified by Cort Dougan (cort@cs.nmt.edu)
 10 * and Paul Mackerras (paulus@cs.anu.edu.au).
 11 *
 12 * This file contains various random system calls that
 13 * have a non-standard calling sequence on the Linux/PPC
 14 * platform.
 15 *
 16 *  This program is free software; you can redistribute it and/or
 17 *  modify it under the terms of the GNU General Public License
 18 *  as published by the Free Software Foundation; either version
 19 *  2 of the License, or (at your option) any later version.
 20 *
 21 */
 22
 23#include <linux/errno.h>
 24#include <linux/sched.h>
 25#include <linux/syscalls.h>
 26#include <linux/mm.h>
 27#include <linux/smp.h>
 28#include <linux/smp_lock.h>
 29#include <linux/sem.h>
 30#include <linux/msg.h>
 31#include <linux/shm.h>
 32#include <linux/stat.h>
 33#include <linux/mman.h>
 34#include <linux/sys.h>
 35#include <linux/ipc.h>
 36#include <linux/utsname.h>
 37#include <linux/file.h>
 38#include <linux/init.h>
 39#include <linux/personality.h>
 40
 41#include <asm/uaccess.h>
 42#include <asm/ipc.h>
 43#include <asm/semaphore.h>
 44#include <asm/time.h>
 45#include <asm/unistd.h>
 46
 47extern unsigned long wall_jiffies;
 48
 49void
 50check_bugs(void)
 51{
 52}
 53
 54/*
 55 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 56 *
 57 * This is really horribly ugly.
 58 */
 59asmlinkage int 
 60sys_ipc (uint call, int first, unsigned long second, long third,
 61	 void __user *ptr, long fifth)
 62{
 63	int version, ret;
 64
 65	version = call >> 16; /* hack for backward compatibility */
 66	call &= 0xffff;
 67
 68	ret = -ENOSYS;
 69	switch (call) {
 70	case SEMOP:
 71		ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
 72				      (unsigned)second, NULL);
 73		break;
 74	case SEMTIMEDOP:
 75		ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
 76				      (unsigned)second,
 77				      (const struct timespec __user *) fifth);
 78		break;
 79	case SEMGET:
 80		ret = sys_semget (first, (int)second, third);
 81		break;
 82	case SEMCTL: {
 83		union semun fourth;
 84
 85		ret = -EINVAL;
 86		if (!ptr)
 87			break;
 88		if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
 89			break;
 90		ret = sys_semctl(first, (int)second, third, fourth);
 91		break;
 92	}
 93	case MSGSND:
 94		ret = sys_msgsnd(first, (struct msgbuf __user *)ptr,
 95				  (size_t)second, third);
 96		break;
 97	case MSGRCV:
 98		switch (version) {
 99		case 0: {
100			struct ipc_kludge tmp;
101
102			ret = -EINVAL;
103			if (!ptr)
104				break;
105			if ((ret = copy_from_user(&tmp,
106						(struct ipc_kludge __user *) ptr,
107						sizeof (tmp)) ? -EFAULT : 0))
108				break;
109			ret = sys_msgrcv(first, tmp.msgp, (size_t) second,
110					  tmp.msgtyp, third);
111			break;
112		}
113		default:
114			ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
115					  (size_t)second, fifth, third);
116			break;
117		}
118		break;
119	case MSGGET:
120		ret = sys_msgget ((key_t)first, (int)second);
121		break;
122	case MSGCTL:
123		ret = sys_msgctl(first, (int)second,
124				  (struct msqid_ds __user *)ptr);
125		break;
126	case SHMAT:
127		switch (version) {
128		default: {
129			ulong raddr;
130			ret = do_shmat(first, (char __user *) ptr,
131					(int)second, &raddr);
132			if (ret)
133				break;
134			ret = put_user (raddr, (ulong __user *) third);
135			break;
136		}
137		case 1:	/* iBCS2 emulator entry point */
138			ret = -EINVAL;
139			if (!segment_eq(get_fs(), get_ds()))
140				break;
141			ret = do_shmat(first, (char __user *)ptr,
142					(int)second, (ulong *)third);
143			break;
144		}
145		break;
146	case SHMDT: 
147		ret = sys_shmdt ((char __user *)ptr);
148		break;
149	case SHMGET:
150		ret = sys_shmget (first, (size_t)second, third);
151		break;
152	case SHMCTL:
153		ret = sys_shmctl(first, (int)second,
154				  (struct shmid_ds __user *)ptr);
155		break;
156	}
157
158	return ret;
159}
160
161/*
162 * sys_pipe() is the normal C calling standard for creating
163 * a pipe. It's not the way unix traditionally does this, though.
164 */
165asmlinkage int sys_pipe(int __user *fildes)
166{
167	int fd[2];
168	int error;
169	
170	error = do_pipe(fd);
171	if (!error) {
172		if (copy_to_user(fildes, fd, 2*sizeof(int)))
173			error = -EFAULT;
174	}
175	
176	return error;
177}
178
179unsigned 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	struct file * file = NULL;
184	unsigned long ret = -EBADF;
185
186	if (!(flags & MAP_ANONYMOUS)) {
187		if (!(file = fget(fd)))
188			goto out;
189	}
190
191	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
192	down_write(&current->mm->mmap_sem);
193	ret = do_mmap(file, addr, len, prot, flags, offset);
194	up_write(&current->mm->mmap_sem);
195	if (file)
196		fput(file);
197
198out:
199	return ret;
200}
201
202static int __init set_fakeppc(char *str)
203{
204	if (*str)
205		return 0;
206	init_task.personality = PER_LINUX32;
207	return 1;
208}
209__setup("fakeppc", set_fakeppc);
210
211asmlinkage int sys_uname(struct old_utsname __user * name)
212{
213	int err = -EFAULT;
214	
215	down_read(&uts_sem);
216	if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
217		err = 0;
218	up_read(&uts_sem);
219	
220	return err;
221}
222
223asmlinkage time_t sys64_time(time_t __user * tloc)
224{
225	time_t secs;
226	time_t usecs;
227
228	long tb_delta = tb_ticks_since(tb_last_stamp);
229	tb_delta += (jiffies - wall_jiffies) * tb_ticks_per_jiffy;
230
231	secs  = xtime.tv_sec;  
232	usecs = (xtime.tv_nsec/1000) + tb_delta / tb_ticks_per_usec;
233	while (usecs >= USEC_PER_SEC) {
234		++secs;
235		usecs -= USEC_PER_SEC;
236	}
237
238	if (tloc) {
239		if (put_user(secs,tloc))
240			secs = -EFAULT;
241	}
242
243	return secs;
244}
245
246void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
247		     unsigned long r6, unsigned long r7, unsigned long r8,
248		     struct pt_regs *regs)
249{
250	printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
251	       " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
252	       current, smp_processor_id());
253}
254
255void do_show_syscall_exit(unsigned long r3)
256{
257	printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
258}