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/personality.h>
39 #include <asm/uaccess.h>
40 #include <asm/syscalls.h>
42 #include <asm/unistd.h>
44 static 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)
48 unsigned long ret = -EINVAL;
50 if (!arch_validate_prot(prot))
54 if (off & ((1 << shift) - 1))
59 ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off);
64 unsigned long sys_mmap2(unsigned long addr, size_t len,
65 unsigned long prot, unsigned long flags,
66 unsigned long fd, unsigned long pgoff)
68 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
71 unsigned long sys_mmap(unsigned long addr, size_t len,
72 unsigned long prot, unsigned long flags,
73 unsigned long fd, off_t offset)
75 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
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
86 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
88 if ( (unsigned long)n >= 4096 )
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))))
99 return sys_select(n, inp, outp, exp, tvp);
104 long ppc64_personality(unsigned long personality)
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;
118 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
119 u32 len_high, u32 len_low)
121 return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
122 (u64)len_high << 32 | len_low, advice);
125 long sys_switch_endian(void)
127 struct thread_info *ti;
129 current->thread.regs->msr ^= MSR_LE;
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.
136 ti = current_thread_info();
137 ti->flags |= _TIF_RESTOREALL;