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syscalls.c

/*
 *  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/init.h>
#include <linux/personality.h>

#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <asm/syscalls.h>
#include <asm/time.h>
#include <asm/unistd.h>

/*
 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 *
 * This is really horribly ugly.
 */
int sys_ipc(uint call, int first, unsigned long second, long third,
          void __user *ptr, long fifth)
{
      int version, ret;

      version = call >> 16; /* hack for backward compatibility */
      call &= 0xffff;

      ret = -ENOSYS;
      switch (call) {
      case SEMOP:
            ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
                              (unsigned)second, NULL);
            break;
      case SEMTIMEDOP:
            ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
                              (unsigned)second,
                              (const struct timespec __user *) fifth);
            break;
      case SEMGET:
            ret = sys_semget (first, (int)second, third);
            break;
      case SEMCTL: {
            union semun fourth;

            ret = -EINVAL;
            if (!ptr)
                  break;
            if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
                  break;
            ret = sys_semctl(first, (int)second, third, fourth);
            break;
      }
      case MSGSND:
            ret = sys_msgsnd(first, (struct msgbuf __user *)ptr,
                         (size_t)second, third);
            break;
      case MSGRCV:
            switch (version) {
            case 0: {
                  struct ipc_kludge tmp;

                  ret = -EINVAL;
                  if (!ptr)
                        break;
                  if ((ret = copy_from_user(&tmp,
                                    (struct ipc_kludge __user *) ptr,
                                    sizeof (tmp)) ? -EFAULT : 0))
                        break;
                  ret = sys_msgrcv(first, tmp.msgp, (size_t) second,
                                tmp.msgtyp, third);
                  break;
            }
            default:
                  ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
                                (size_t)second, fifth, third);
                  break;
            }
            break;
      case MSGGET:
            ret = sys_msgget((key_t)first, (int)second);
            break;
      case MSGCTL:
            ret = sys_msgctl(first, (int)second,
                          (struct msqid_ds __user *)ptr);
            break;
      case SHMAT: {
            ulong raddr;
            ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr);
            if (ret)
                  break;
            ret = put_user(raddr, (ulong __user *) third);
            break;
      }
      case SHMDT:
            ret = sys_shmdt((char __user *)ptr);
            break;
      case SHMGET:
            ret = sys_shmget(first, (size_t)second, third);
            break;
      case SHMCTL:
            ret = sys_shmctl(first, (int)second,
                         (struct shmid_ds __user *)ptr);
            break;
      }

      return ret;
}

/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way unix traditionally does this, though.
 */
int sys_pipe(int __user *fildes)
{
      int fd[2];
      int error;

      error = do_pipe(fd);
      if (!error) {
            if (copy_to_user(fildes, fd, 2*sizeof(int)))
                  error = -EFAULT;
      }
      return error;
}

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)
{
      struct file * file = NULL;
      unsigned long ret = -EINVAL;

      if (shift) {
            if (off & ((1 << shift) - 1))
                  goto out;
            off >>= shift;
      }
            
      ret = -EBADF;
      if (!(flags & MAP_ANONYMOUS)) {
            if (!(file = fget(fd)))
                  goto out;
      }

      flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);

      down_write(&current->mm->mmap_sem);
      ret = do_mmap_pgoff(file, addr, len, prot, flags, off);
      up_write(&current->mm->mmap_sem);
      if (file)
            fput(file);
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 == PER_LINUX)
            personality = PER_LINUX32;
      ret = sys_personality(personality);
      if (ret == PER_LINUX32)
            ret = PER_LINUX;
      return ret;
}
#endif

#ifdef CONFIG_PPC64
#define OVERRIDE_MACHINE    (personality(current->personality) == PER_LINUX32)
#else
#define OVERRIDE_MACHINE    0
#endif

static inline int override_machine(char __user *mach)
{
      if (OVERRIDE_MACHINE) {
            /* change ppc64 to ppc */
            if (__put_user(0, mach+3) || __put_user(0, mach+4))
                  return -EFAULT;
      }
      return 0;
}

long ppc_newuname(struct new_utsname __user * name)
{
      int err = 0;

      down_read(&uts_sem);
      if (copy_to_user(name, utsname(), sizeof(*name)))
            err = -EFAULT;
      up_read(&uts_sem);
      if (!err)
            err = override_machine(name->machine);
      return err;
}

int sys_uname(struct old_utsname __user *name)
{
      int err = 0;
      
      down_read(&uts_sem);
      if (copy_to_user(name, utsname(), sizeof(*name)))
            err = -EFAULT;
      up_read(&uts_sem);
      if (!err)
            err = override_machine(name->machine);
      return err;
}

int sys_olduname(struct oldold_utsname __user *name)
{
      int error;

      if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
            return -EFAULT;
  
      down_read(&uts_sem);
      error = __copy_to_user(&name->sysname, &utsname()->sysname,
                         __OLD_UTS_LEN);
      error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
      error |= __copy_to_user(&name->nodename, &utsname()->nodename,
                        __OLD_UTS_LEN);
      error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
      error |= __copy_to_user(&name->release, &utsname()->release,
                        __OLD_UTS_LEN);
      error |= __put_user(0, name->release + __OLD_UTS_LEN);
      error |= __copy_to_user(&name->version, &utsname()->version,
                        __OLD_UTS_LEN);
      error |= __put_user(0, name->version + __OLD_UTS_LEN);
      error |= __copy_to_user(&name->machine, &utsname()->machine,
                        __OLD_UTS_LEN);
      error |= override_machine(name->machine);
      up_read(&uts_sem);

      return error? -EFAULT: 0;
}

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());
}

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