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sys_sh64.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * arch/sh64/kernel/sys_sh64.c
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the Linux/SH5
 * platform.
 *
 * Mostly taken from i386 version.
 *
 */

#include <linux/errno.h>
#include <linux/rwsem.h>
#include <linux/sched.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/file.h>
#include <linux/utsname.h>
#include <linux/syscalls.h>
#include <linux/ipc.h>
#include <asm/uaccess.h>
#include <asm/ptrace.h>
#include <asm/unistd.h>

#define REG_3     3

/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way Unix traditionally does this, though.
 */
#ifdef NEW_PIPE_IMPLEMENTATION
asmlinkage int sys_pipe(unsigned long * fildes,
                  unsigned long   dummy_r3,
                  unsigned long   dummy_r4,
                  unsigned long   dummy_r5,
                  unsigned long   dummy_r6,
                  unsigned long   dummy_r7,
                  struct pt_regs * regs)     /* r8 = pt_regs  forced by entry.S */
{
      int fd[2];
      int ret;

      ret = do_pipe(fd);
      if (ret == 0)
            /*
             ***********************************************************************
             *   To avoid the copy_to_user we prefer to break the ABIs convention, *
             *   packing the valid pair of file IDs into a single register (r3);   *
             *   while r2 is the return code as defined by the sh5-ABIs.             *
             *   BE CAREFUL: pipe stub, into glibc, must be aware of this solution *
             ***********************************************************************

#ifdef __LITTLE_ENDIAN__
            regs->regs[REG_3] = (((unsigned long long) fd[1]) << 32) | ((unsigned long long) fd[0]);
#else
            regs->regs[REG_3] = (((unsigned long long) fd[0]) << 32) | ((unsigned long long) fd[1]);
#endif

            */
             /* although not very clever this is endianess independent */
            regs->regs[REG_3] = (unsigned long long) *((unsigned long long *) fd);

      return ret;
}

#else
asmlinkage int sys_pipe(unsigned long * 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;
}

#endif

/*
 * To avoid cache alias, we map the shard page with same color.
 */
#define COLOUR_ALIGN(addr)    (((addr)+SHMLBA-1)&~(SHMLBA-1))

unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
      unsigned long len, unsigned long pgoff, unsigned long flags)
{
      struct vm_area_struct *vma;

      if (flags & MAP_FIXED) {
            /* We do not accept a shared mapping if it would violate
             * cache aliasing constraints.
             */
            if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
                  return -EINVAL;
            return addr;
      }

      if (len > TASK_SIZE)
            return -ENOMEM;
      if (!addr)
            addr = TASK_UNMAPPED_BASE;

      if (flags & MAP_PRIVATE)
            addr = PAGE_ALIGN(addr);
      else
            addr = COLOUR_ALIGN(addr);

      for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
            /* At this point:  (!vma || addr < vma->vm_end). */
            if (TASK_SIZE - len < addr)
                  return -ENOMEM;
            if (!vma || addr + len <= vma->vm_start)
                  return addr;
            addr = vma->vm_end;
            if (!(flags & MAP_PRIVATE))
                  addr = COLOUR_ALIGN(addr);
      }
}

/* common code for old and new mmaps */
static inline long do_mmap2(
      unsigned long addr, unsigned long len,
      unsigned long prot, unsigned long flags,
      unsigned long fd, unsigned long pgoff)
{
      int error = -EBADF;
      struct file * file = NULL;

      flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
      if (!(flags & MAP_ANONYMOUS)) {
            file = fget(fd);
            if (!file)
                  goto out;
      }

      down_write(&current->mm->mmap_sem);
      error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
      up_write(&current->mm->mmap_sem);

      if (file)
            fput(file);
out:
      return error;
}

asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
      unsigned long prot, unsigned long flags,
      unsigned long fd, unsigned long pgoff)
{
      return do_mmap2(addr, len, prot, flags, fd, pgoff);
}

asmlinkage int old_mmap(unsigned long addr, unsigned long len,
      unsigned long prot, unsigned long flags,
      int fd, unsigned long off)
{
      if (off & ~PAGE_MASK)
            return -EINVAL;
      return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
}

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

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

      if (call <= SEMCTL)
            switch (call) {
            case SEMOP:
                  return sys_semtimedop(first, (struct sembuf __user *)ptr,
                                    second, NULL);
            case SEMTIMEDOP:
                  return sys_semtimedop(first, (struct sembuf __user *)ptr,
                                    second,
                                    (const struct timespec __user *)fifth);
            case SEMGET:
                  return sys_semget (first, second, third);
            case SEMCTL: {
                  union semun fourth;
                  if (!ptr)
                        return -EINVAL;
                  if (get_user(fourth.__pad, (void * __user *) ptr))
                        return -EFAULT;
                  return sys_semctl (first, second, third, fourth);
                  }
            default:
                  return -EINVAL;
            }

      if (call <= MSGCTL)
            switch (call) {
            case MSGSND:
                  return sys_msgsnd (first, (struct msgbuf __user *) ptr,
                                second, third);
            case MSGRCV:
                  switch (version) {
                  case 0: {
                        struct ipc_kludge tmp;
                        if (!ptr)
                              return -EINVAL;

                        if (copy_from_user(&tmp,
                                       (struct ipc_kludge __user *) ptr,
                                       sizeof (tmp)))
                              return -EFAULT;
                        return sys_msgrcv (first, tmp.msgp, second,
                                       tmp.msgtyp, third);
                        }
                  default:
                        return sys_msgrcv (first,
                                       (struct msgbuf __user *) ptr,
                                       second, fifth, third);
                  }
            case MSGGET:
                  return sys_msgget ((key_t) first, second);
            case MSGCTL:
                  return sys_msgctl (first, second,
                                 (struct msqid_ds __user *) ptr);
            default:
                  return -EINVAL;
            }
      if (call <= SHMCTL)
            switch (call) {
            case SHMAT:
                  switch (version) {
                  default: {
                        ulong raddr;
                        ret = do_shmat (first, (char __user *) ptr,
                                     second, &raddr);
                        if (ret)
                              return ret;
                        return put_user (raddr, (ulong __user *) third);
                  }
                  case 1:     /* iBCS2 emulator entry point */
                        if (!segment_eq(get_fs(), get_ds()))
                              return -EINVAL;
                        return do_shmat (first, (char __user *) ptr,
                                      second, (ulong *) third);
                  }
            case SHMDT:
                  return sys_shmdt ((char __user *)ptr);
            case SHMGET:
                  return sys_shmget (first, second, third);
            case SHMCTL:
                  return sys_shmctl (first, second,
                                 (struct shmid_ds __user *) ptr);
            default:
                  return -EINVAL;
            }

      return -EINVAL;
}

asmlinkage int sys_uname(struct old_utsname * name)
{
      int err;
      if (!name)
            return -EFAULT;
      down_read(&uts_sem);
      err = copy_to_user(name, utsname(), sizeof (*name));
      up_read(&uts_sem);
      return err?-EFAULT:0;
}

/*
 * Do a system call from kernel instead of calling sys_execve so we
 * end up with proper pt_regs.
 */
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
      register unsigned long __sc0 __asm__ ("r9") = ((0x13 << 16) | __NR_execve);
      register unsigned long __sc2 __asm__ ("r2") = (unsigned long) filename;
      register unsigned long __sc3 __asm__ ("r3") = (unsigned long) argv;
      register unsigned long __sc4 __asm__ ("r4") = (unsigned long) envp;
      __asm__ __volatile__ ("trapa  %1 !\t\t\t execve(%2,%3,%4)"
      : "=r" (__sc0)
      : "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) );
      __asm__ __volatile__ ("!dummy %0 %1 %2 %3"
      : : "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) : "memory");
      return __sc0;
}

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