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-rw-r--r--arch/ppc64/kernel/syscalls.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/syscalls.c b/arch/ppc64/kernel/syscalls.c
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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}
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