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/personality.h>
38
39#include <asm/uaccess.h>
40#include <asm/syscalls.h>
41#include <asm/time.h>
42#include <asm/unistd.h>
43
44static inline unsigned long do_mmap2(unsigned long addr, size_t len,
45			unsigned long prot, unsigned long flags,
46			unsigned long fd, unsigned long off, int shift)
47{
48	unsigned long ret = -EINVAL;
49
50	if (!arch_validate_prot(prot))
51		goto out;
52
53	if (shift) {
54		if (off & ((1 << shift) - 1))
55			goto out;
56		off >>= shift;
57	}
58
59	ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off);
60out:
61	return ret;
62}
63
64unsigned long sys_mmap2(unsigned long addr, size_t len,
65			unsigned long prot, unsigned long flags,
66			unsigned long fd, unsigned long pgoff)
67{
68	return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
69}
70
71unsigned long sys_mmap(unsigned long addr, size_t len,
72		       unsigned long prot, unsigned long flags,
73		       unsigned long fd, off_t offset)
74{
75	return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
76}
77
78#ifdef CONFIG_PPC32
79/*
80 * Due to some executables calling the wrong select we sometimes
81 * get wrong args.  This determines how the args are being passed
82 * (a single ptr to them all args passed) then calls
83 * sys_select() with the appropriate args. -- Cort
84 */
85int
86ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
87{
88	if ( (unsigned long)n >= 4096 )
89	{
90		unsigned long __user *buffer = (unsigned long __user *)n;
91		if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
92		    || __get_user(n, buffer)
93		    || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
94		    || __get_user(outp, ((fd_set  __user * __user *)(buffer+2)))
95		    || __get_user(exp, ((fd_set  __user * __user *)(buffer+3)))
96		    || __get_user(tvp, ((struct timeval  __user * __user *)(buffer+4))))
97			return -EFAULT;
98	}
99	return sys_select(n, inp, outp, exp, tvp);
100}
101#endif
102
103#ifdef CONFIG_PPC64
104long ppc64_personality(unsigned long personality)
105{
106	long ret;
107
108	if (personality(current->personality) == PER_LINUX32
109	    && personality(personality) == PER_LINUX)
110		personality = (personality & ~PER_MASK) | PER_LINUX32;
111	ret = sys_personality(personality);
112	if (personality(ret) == PER_LINUX32)
113		ret = (ret & ~PER_MASK) | PER_LINUX;
114	return ret;
115}
116#endif
117
118long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
119		      u32 len_high, u32 len_low)
120{
121	return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
122			     (u64)len_high << 32 | len_low, advice);
123}
124
125long sys_switch_endian(void)
126{
127	struct thread_info *ti;
128
129	current->thread.regs->msr ^= MSR_LE;
130
131	/*
132	 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to
133	 * userspace. That also has the effect of restoring the non-volatile
134	 * GPRs, so we saved them on the way in here.
135	 */
136	ti = current_thread_info();
137	ti->flags |= _TIF_RESTOREALL;
138
139	return 0;
140}
141