text: /*
   *  Implementation of various system calls for Linux/PowerPC
   *
   *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   *
   * Derived from "arch/i386/kernel/sys_i386.c"
   * Adapted from the i386 version by Gary Thomas
   * Modified by Cort Dougan (cort@cs.nmt.edu)
   * and Paul Mackerras (paulus@cs.anu.edu.au).
   *
   * This file contains various random system calls that
   * have a non-standard calling sequence on the Linux/PPC
   * platform.
   *
   *  This program is free software; you can redistribute it and/or
   *  modify it under the terms of the GNU General Public License
   *  as published by the Free Software Foundation; either version
   *  2 of the License, or (at your option) any later version.
   *
   */
  
  #include <linux/errno.h>
  #include <linux/sched.h>
  #include <linux/syscalls.h>
  #include <linux/mm.h>
  #include <linux/fs.h>
  #include <linux/smp.h>
  #include <linux/sem.h>
  #include <linux/msg.h>
  #include <linux/shm.h>
  #include <linux/stat.h>
  #include <linux/mman.h>
  #include <linux/sys.h>
  #include <linux/ipc.h>
  #include <linux/utsname.h>
  #include <linux/file.h>
  #include <linux/personality.h>
  
  #include <asm/uaccess.h>
  #include <asm/syscalls.h>
  #include <asm/time.h>
  #include <asm/unistd.h>
  
  static inline unsigned long do_mmap2(unsigned long addr, size_t len,
  			unsigned long prot, unsigned long flags,
  			unsigned long fd, unsigned long off, int shift)
  {
  	unsigned long ret = -EINVAL;
  
  	if (!arch_validate_prot(prot))
  		goto out;
  
  	if (shift) {
  		if (off & ((1 << shift) - 1))
  			goto out;
  		off >>= shift;
  	}
  
  	ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off);
  out:
  	return ret;
  }
  
  unsigned long sys_mmap2(unsigned long addr, size_t len,
  			unsigned long prot, unsigned long flags,
  			unsigned long fd, unsigned long pgoff)
  {
  	return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
  }
  
  unsigned long sys_mmap(unsigned long addr, size_t len,
  		       unsigned long prot, unsigned long flags,
  		       unsigned long fd, off_t offset)
  {
  	return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
  }
  
  #ifdef CONFIG_PPC32
  /*
   * Due to some executables calling the wrong select we sometimes
   * get wrong args.  This determines how the args are being passed
   * (a single ptr to them all args passed) then calls
   * sys_select() with the appropriate args. -- Cort
   */
  int
  ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
  {
  	if ( (unsigned long)n >= 4096 )
  	{
  		unsigned long __user *buffer = (unsigned long __user *)n;
  		if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
  		    || __get_user(n, buffer)
  		    || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
  		    || __get_user(outp, ((fd_set  __user * __user *)(buffer+2)))
  		    || __get_user(exp, ((fd_set  __user * __user *)(buffer+3)))
  		    || __get_user(tvp, ((struct timeval  __user * __user *)(buffer+4))))
  			return -EFAULT;
  	}
  	return sys_select(n, inp, outp, exp, tvp);
  }
  #endif
  
  #ifdef CONFIG_PPC64
  long ppc64_personality(unsigned long personality)
  {
  	long ret;
  
  	if (personality(current->personality) == PER_LINUX32
  	    && personality(personality) == PER_LINUX)
  		personality = (personality & ~PER_MASK) | PER_LINUX32;
  	ret = sys_personality(personality);
  	if (personality(ret) == PER_LINUX32)
  		ret = (ret & ~PER_MASK) | PER_LINUX;
  	return ret;
  }
  #endif
  
  long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
  		      u32 len_high, u32 len_low)
  {
  	return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
  			     (u64)len_high << 32 | len_low, advice);
  }
  
  void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
  		     unsigned long r6, unsigned long r7, unsigned long r8,
  		     struct pt_regs *regs)
  {
  	printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
  	       " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
  	       current, smp_processor_id());
  }
  
  void do_show_syscall_exit(unsigned long r3)
  {
  	printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
  }
  