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 <linux/uaccess.h>
40 #include <asm/syscalls.h>
41 #include <asm/time.h>
42 #include <asm/unistd.h>
43 #include <asm/asm-prototypes.h>
44
do_mmap2(unsigned long addr,size_t len,unsigned long prot,unsigned long flags,unsigned long fd,unsigned long off,int shift)45 static inline long do_mmap2(unsigned long addr, size_t len,
46 unsigned long prot, unsigned long flags,
47 unsigned long fd, unsigned long off, int shift)
48 {
49 long ret = -EINVAL;
50
51 if (!arch_validate_prot(prot, addr))
52 goto out;
53
54 if (shift) {
55 if (off & ((1 << shift) - 1))
56 goto out;
57 off >>= shift;
58 }
59
60 ret = ksys_mmap_pgoff(addr, len, prot, flags, fd, off);
61 out:
62 return ret;
63 }
64
SYSCALL_DEFINE6(mmap2,unsigned long,addr,size_t,len,unsigned long,prot,unsigned long,flags,unsigned long,fd,unsigned long,pgoff)65 SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
66 unsigned long, prot, unsigned long, flags,
67 unsigned long, fd, unsigned long, pgoff)
68 {
69 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
70 }
71
SYSCALL_DEFINE6(mmap,unsigned long,addr,size_t,len,unsigned long,prot,unsigned long,flags,unsigned long,fd,off_t,offset)72 SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
73 unsigned long, prot, unsigned long, flags,
74 unsigned long, fd, off_t, offset)
75 {
76 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
77 }
78
79 #ifdef CONFIG_PPC32
80 /*
81 * Due to some executables calling the wrong select we sometimes
82 * get wrong args. This determines how the args are being passed
83 * (a single ptr to them all args passed) then calls
84 * sys_select() with the appropriate args. -- Cort
85 */
86 int
ppc_select(int n,fd_set __user * inp,fd_set __user * outp,fd_set __user * exp,struct timeval __user * tvp)87 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
88 {
89 if ( (unsigned long)n >= 4096 )
90 {
91 unsigned long __user *buffer = (unsigned long __user *)n;
92 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
93 || __get_user(n, buffer)
94 || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
95 || __get_user(outp, ((fd_set __user * __user *)(buffer+2)))
96 || __get_user(exp, ((fd_set __user * __user *)(buffer+3)))
97 || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4))))
98 return -EFAULT;
99 }
100 return sys_select(n, inp, outp, exp, tvp);
101 }
102 #endif
103
104 #ifdef CONFIG_PPC64
ppc64_personality(unsigned long personality)105 long ppc64_personality(unsigned long personality)
106 {
107 long ret;
108
109 if (personality(current->personality) == PER_LINUX32
110 && personality(personality) == PER_LINUX)
111 personality = (personality & ~PER_MASK) | PER_LINUX32;
112 ret = sys_personality(personality);
113 if (personality(ret) == PER_LINUX32)
114 ret = (ret & ~PER_MASK) | PER_LINUX;
115 return ret;
116 }
117 #endif
118
ppc_fadvise64_64(int fd,int advice,u32 offset_high,u32 offset_low,u32 len_high,u32 len_low)119 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
120 u32 len_high, u32 len_low)
121 {
122 return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low,
123 (u64)len_high << 32 | len_low, advice);
124 }
125
sys_switch_endian(void)126 long sys_switch_endian(void)
127 {
128 struct thread_info *ti;
129
130 current->thread.regs->msr ^= MSR_LE;
131
132 /*
133 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to
134 * userspace. That also has the effect of restoring the non-volatile
135 * GPRs, so we saved them on the way in here.
136 */
137 ti = current_thread_info();
138 ti->flags |= _TIF_RESTOREALL;
139
140 return 0;
141 }
142
