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32 results

sys_m68k.c

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  • sys_m68k.c 15.06 KiB
    /*
     * linux/arch/m68k/kernel/sys_m68k.c
     *
     * This file contains various random system calls that
     * have a non-standard calling sequence on the Linux/m68k
     * platform.
     */
    
    #include <linux/capability.h>
    #include <linux/errno.h>
    #include <linux/sched.h>
    #include <linux/mm.h>
    #include <linux/smp.h>
    #include <linux/smp_lock.h>
    #include <linux/sem.h>
    #include <linux/msg.h>
    #include <linux/shm.h>
    #include <linux/stat.h>
    #include <linux/syscalls.h>
    #include <linux/mman.h>
    #include <linux/file.h>
    #include <linux/utsname.h>
    
    #include <asm/setup.h>
    #include <asm/uaccess.h>
    #include <asm/cachectl.h>
    #include <asm/traps.h>
    #include <asm/ipc.h>
    #include <asm/page.h>
    #include <asm/unistd.h>
    
    /*
     * sys_pipe() is the normal C calling standard for creating
     * a pipe. It's not the way unix traditionally does this, though.
     */
    asmlinkage int sys_pipe(unsigned long __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;
    }
    
    /* 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);
    }
    
    /*
     * Perform the select(nd, in, out, ex, tv) and mmap() system
     * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
     * handle more than 4 system call parameters, so these system calls
     * used a memory block for parameter passing..
     */
    
    struct mmap_arg_struct {
    	unsigned long addr;
    	unsigned long len;
    	unsigned long prot;
    	unsigned long flags;
    	unsigned long fd;
    	unsigned long offset;
    };
    
    asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
    {
    	struct mmap_arg_struct a;
    	int error = -EFAULT;
    
    	if (copy_from_user(&a, arg, sizeof(a)))
    		goto out;
    
    	error = -EINVAL;
    	if (a.offset & ~PAGE_MASK)
    		goto out;
    
    	a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
    
    	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
    out:
    	return error;
    }
    
    #if 0
    struct mmap_arg_struct64 {
    	__u32 addr;
    	__u32 len;
    	__u32 prot;
    	__u32 flags;
    	__u64 offset; /* 64 bits */
    	__u32 fd;
    };
    
    asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
    {
    	int error = -EFAULT;
    	struct file * file = NULL;
    	struct mmap_arg_struct64 a;
    	unsigned long pgoff;
    
    	if (copy_from_user(&a, arg, sizeof(a)))
    		return -EFAULT;
    
    	if ((long)a.offset & ~PAGE_MASK)
    		return -EINVAL;
    
    	pgoff = a.offset >> PAGE_SHIFT;
    	if ((a.offset >> PAGE_SHIFT) != pgoff)
    		return -EINVAL;
    
    	if (!(a.flags & MAP_ANONYMOUS)) {
    		error = -EBADF;
    		file = fget(a.fd);
    		if (!file)
    			goto out;
    	}
    	a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
    
    	down_write(&current->mm->mmap_sem);
    	error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
    	up_write(&current->mm->mmap_sem);
    	if (file)
    		fput(file);
    out:
    	return error;
    }
    #endif
    
    struct sel_arg_struct {
    	unsigned long n;
    	fd_set __user *inp, *outp, *exp;
    	struct timeval __user *tvp;
    };
    
    asmlinkage int old_select(struct sel_arg_struct __user *arg)
    {
    	struct sel_arg_struct a;
    
    	if (copy_from_user(&a, arg, sizeof(a)))
    		return -EFAULT;
    	/* sys_select() does the appropriate kernel locking */
    	return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
    }
    
    /*
     * 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_semop (first, ptr, second);
    		case SEMGET:
    			return sys_semget (first, second, third);
    		case SEMCTL: {
    			union semun fourth;
    			if (!ptr)
    				return -EINVAL;
    			if (get_user(fourth.__pad, (void __user *__user *) ptr))
    				return -EFAULT;
    			return sys_semctl (first, second, third, fourth);
    			}
    		default:
    			return -ENOSYS;
    		}
    	if (call <= MSGCTL)
    		switch (call) {
    		case MSGSND:
    			return sys_msgsnd (first, ptr, second, third);
    		case MSGRCV:
    			switch (version) {
    			case 0: {
    				struct ipc_kludge tmp;
    				if (!ptr)
    					return -EINVAL;
    				if (copy_from_user (&tmp, ptr, sizeof (tmp)))
    					return -EFAULT;
    				return sys_msgrcv (first, tmp.msgp, second,
    						   tmp.msgtyp, third);
    				}
    			default:
    				return sys_msgrcv (first, ptr,
    						   second, fifth, third);
    			}
    		case MSGGET:
    			return sys_msgget ((key_t) first, second);
    		case MSGCTL:
    			return sys_msgctl (first, second, ptr);
    		default:
    			return -ENOSYS;
    		}
    	if (call <= SHMCTL)
    		switch (call) {
    		case SHMAT:
    			switch (version) {
    			default: {
    				ulong raddr;
    				ret = do_shmat (first, ptr, second, &raddr);
    				if (ret)
    					return ret;
    				return put_user (raddr, (ulong __user *) third);
    			}
    			}
    		case SHMDT:
    			return sys_shmdt (ptr);
    		case SHMGET:
    			return sys_shmget (first, second, third);
    		case SHMCTL:
    			return sys_shmctl (first, second, ptr);
    		default:
    			return -ENOSYS;
    		}
    
    	return -EINVAL;
    }
    
    /* Convert virtual (user) address VADDR to physical address PADDR */
    #define virt_to_phys_040(vaddr)						\
    ({									\
      unsigned long _mmusr, _paddr;						\
    									\
      __asm__ __volatile__ (".chip 68040\n\t"				\
    			"ptestr (%1)\n\t"				\
    			"movec %%mmusr,%0\n\t"				\
    			".chip 68k"					\
    			: "=r" (_mmusr)					\
    			: "a" (vaddr));					\
      _paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0;		\
      _paddr;								\
    })
    
    static inline int
    cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len)
    {
      unsigned long paddr, i;
    
      switch (scope)
        {
        case FLUSH_SCOPE_ALL:
          switch (cache)
    	{
    	case FLUSH_CACHE_DATA:
    	  /* This nop is needed for some broken versions of the 68040.  */
    	  __asm__ __volatile__ ("nop\n\t"
    				".chip 68040\n\t"
    				"cpusha %dc\n\t"
    				".chip 68k");
    	  break;
    	case FLUSH_CACHE_INSN:
    	  __asm__ __volatile__ ("nop\n\t"
    				".chip 68040\n\t"
    				"cpusha %ic\n\t"
    				".chip 68k");
    	  break;
    	default:
    	case FLUSH_CACHE_BOTH:
    	  __asm__ __volatile__ ("nop\n\t"
    				".chip 68040\n\t"
    				"cpusha %bc\n\t"
    				".chip 68k");
    	  break;
    	}
          break;
    
        case FLUSH_SCOPE_LINE:
          /* Find the physical address of the first mapped page in the
    	 address range.  */
          if ((paddr = virt_to_phys_040(addr))) {
            paddr += addr & ~(PAGE_MASK | 15);
            len = (len + (addr & 15) + 15) >> 4;
          } else {
    	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
    
    	if (len <= tmp)
    	  return 0;
    	addr += tmp;
    	len -= tmp;
    	tmp = PAGE_SIZE;
    	for (;;)
    	  {
    	    if ((paddr = virt_to_phys_040(addr)))
    	      break;
    	    if (len <= tmp)
    	      return 0;
    	    addr += tmp;
    	    len -= tmp;
    	  }
    	len = (len + 15) >> 4;
          }
          i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
          while (len--)
    	{
    	  switch (cache)
    	    {
    	    case FLUSH_CACHE_DATA:
    	      __asm__ __volatile__ ("nop\n\t"
    				    ".chip 68040\n\t"
    				    "cpushl %%dc,(%0)\n\t"
    				    ".chip 68k"
    				    : : "a" (paddr));
    	      break;
    	    case FLUSH_CACHE_INSN:
    	      __asm__ __volatile__ ("nop\n\t"
    				    ".chip 68040\n\t"
    				    "cpushl %%ic,(%0)\n\t"
    				    ".chip 68k"
    				    : : "a" (paddr));
    	      break;
    	    default:
    	    case FLUSH_CACHE_BOTH:
    	      __asm__ __volatile__ ("nop\n\t"
    				    ".chip 68040\n\t"
    				    "cpushl %%bc,(%0)\n\t"
    				    ".chip 68k"
    				    : : "a" (paddr));
    	      break;
    	    }
    	  if (!--i && len)
    	    {
    	      /*
    	       * No need to page align here since it is done by
    	       * virt_to_phys_040().
    	       */
    	      addr += PAGE_SIZE;
    	      i = PAGE_SIZE / 16;
    	      /* Recompute physical address when crossing a page
    	         boundary. */
    	      for (;;)
    		{
    		  if ((paddr = virt_to_phys_040(addr)))
    		    break;
    		  if (len <= i)
    		    return 0;
    		  len -= i;
    		  addr += PAGE_SIZE;
    		}
    	    }
    	  else
    	    paddr += 16;
    	}
          break;
    
        default:
        case FLUSH_SCOPE_PAGE:
          len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
          for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
    	{
    	  if (!(paddr = virt_to_phys_040(addr)))
    	    continue;
    	  switch (cache)
    	    {
    	    case FLUSH_CACHE_DATA:
    	      __asm__ __volatile__ ("nop\n\t"
    				    ".chip 68040\n\t"
    				    "cpushp %%dc,(%0)\n\t"
    				    ".chip 68k"
    				    : : "a" (paddr));
    	      break;
    	    case FLUSH_CACHE_INSN:
    	      __asm__ __volatile__ ("nop\n\t"
    				    ".chip 68040\n\t"
    				    "cpushp %%ic,(%0)\n\t"
    				    ".chip 68k"
    				    : : "a" (paddr));
    	      break;
    	    default:
    	    case FLUSH_CACHE_BOTH:
    	      __asm__ __volatile__ ("nop\n\t"
    				    ".chip 68040\n\t"
    				    "cpushp %%bc,(%0)\n\t"
    				    ".chip 68k"
    				    : : "a" (paddr));
    	      break;
    	    }
    	}
          break;
        }
      return 0;
    }
    
    #define virt_to_phys_060(vaddr)				\
    ({							\
      unsigned long paddr;					\
      __asm__ __volatile__ (".chip 68060\n\t"		\
    			"plpar (%0)\n\t"		\
    			".chip 68k"			\
    			: "=a" (paddr)			\
    			: "0" (vaddr));			\
      (paddr); /* XXX */					\
    })
    
    static inline int
    cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len)
    {
      unsigned long paddr, i;
    
      /*
       * 68060 manual says:
       *  cpush %dc : flush DC, remains valid (with our %cacr setup)
       *  cpush %ic : invalidate IC
       *  cpush %bc : flush DC + invalidate IC
       */
      switch (scope)
        {
        case FLUSH_SCOPE_ALL:
          switch (cache)
    	{
    	case FLUSH_CACHE_DATA:
    	  __asm__ __volatile__ (".chip 68060\n\t"
    				"cpusha %dc\n\t"
    				".chip 68k");
    	  break;
    	case FLUSH_CACHE_INSN:
    	  __asm__ __volatile__ (".chip 68060\n\t"
    				"cpusha %ic\n\t"
    				".chip 68k");
    	  break;
    	default:
    	case FLUSH_CACHE_BOTH:
    	  __asm__ __volatile__ (".chip 68060\n\t"
    				"cpusha %bc\n\t"
    				".chip 68k");
    	  break;
    	}
          break;
    
        case FLUSH_SCOPE_LINE:
          /* Find the physical address of the first mapped page in the
    	 address range.  */
          len += addr & 15;
          addr &= -16;
          if (!(paddr = virt_to_phys_060(addr))) {
    	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
    
    	if (len <= tmp)
    	  return 0;
    	addr += tmp;
    	len -= tmp;
    	tmp = PAGE_SIZE;
    	for (;;)
    	  {
    	    if ((paddr = virt_to_phys_060(addr)))
    	      break;
    	    if (len <= tmp)
    	      return 0;
    	    addr += tmp;
    	    len -= tmp;
    	  }
          }
          len = (len + 15) >> 4;
          i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
          while (len--)
    	{
    	  switch (cache)
    	    {
    	    case FLUSH_CACHE_DATA:
    	      __asm__ __volatile__ (".chip 68060\n\t"
    				    "cpushl %%dc,(%0)\n\t"
    				    ".chip 68k"
    				    : : "a" (paddr));
    	      break;
    	    case FLUSH_CACHE_INSN:
    	      __asm__ __volatile__ (".chip 68060\n\t"
    				    "cpushl %%ic,(%0)\n\t"
    				    ".chip 68k"
    				    : : "a" (paddr));
    	      break;
    	    default:
    	    case FLUSH_CACHE_BOTH:
    	      __asm__ __volatile__ (".chip 68060\n\t"
    				    "cpushl %%bc,(%0)\n\t"
    				    ".chip 68k"
    				    : : "a" (paddr));
    	      break;
    	    }
    	  if (!--i && len)
    	    {
    
    	      /*
    	       * We just want to jump to the first cache line
    	       * in the next page.
    	       */
    	      addr += PAGE_SIZE;
    	      addr &= PAGE_MASK;
    
    	      i = PAGE_SIZE / 16;
    	      /* Recompute physical address when crossing a page
    	         boundary. */
    	      for (;;)
    	        {
    	          if ((paddr = virt_to_phys_060(addr)))
    	            break;
    	          if (len <= i)
    	            return 0;
    	          len -= i;
    	          addr += PAGE_SIZE;
    	        }
    	    }
    	  else
    	    paddr += 16;
    	}
          break;
    
        default:
        case FLUSH_SCOPE_PAGE:
          len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
          addr &= PAGE_MASK;	/* Workaround for bug in some
    				   revisions of the 68060 */
          for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
    	{
    	  if (!(paddr = virt_to_phys_060(addr)))
    	    continue;
    	  switch (cache)
    	    {
    	    case FLUSH_CACHE_DATA:
    	      __asm__ __volatile__ (".chip 68060\n\t"
    				    "cpushp %%dc,(%0)\n\t"
    				    ".chip 68k"
    				    : : "a" (paddr));
    	      break;
    	    case FLUSH_CACHE_INSN:
    	      __asm__ __volatile__ (".chip 68060\n\t"
    				    "cpushp %%ic,(%0)\n\t"
    				    ".chip 68k"
    				    : : "a" (paddr));
    	      break;
    	    default:
    	    case FLUSH_CACHE_BOTH:
    	      __asm__ __volatile__ (".chip 68060\n\t"
    				    "cpushp %%bc,(%0)\n\t"
    				    ".chip 68k"
    				    : : "a" (paddr));
    	      break;
    	    }
    	}
          break;
        }
      return 0;
    }
    
    /* sys_cacheflush -- flush (part of) the processor cache.  */
    asmlinkage int
    sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
    {
    	struct vm_area_struct *vma;
    	int ret = -EINVAL;
    
    	lock_kernel();
    	if (scope < FLUSH_SCOPE_LINE || scope > FLUSH_SCOPE_ALL ||
    	    cache & ~FLUSH_CACHE_BOTH)
    		goto out;
    
    	if (scope == FLUSH_SCOPE_ALL) {
    		/* Only the superuser may explicitly flush the whole cache. */
    		ret = -EPERM;
    		if (!capable(CAP_SYS_ADMIN))
    			goto out;
    	} else {
    		/*
    		 * Verify that the specified address region actually belongs
    		 * to this process.
    		 */
    		vma = find_vma (current->mm, addr);
    		ret = -EINVAL;
    		/* Check for overflow.  */
    		if (addr + len < addr)
    			goto out;
    		if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
    			goto out;
    	}
    
    	if (CPU_IS_020_OR_030) {
    		if (scope == FLUSH_SCOPE_LINE && len < 256) {
    			unsigned long cacr;
    			__asm__ ("movec %%cacr, %0" : "=r" (cacr));
    			if (cache & FLUSH_CACHE_INSN)
    				cacr |= 4;
    			if (cache & FLUSH_CACHE_DATA)
    				cacr |= 0x400;
    			len >>= 2;
    			while (len--) {
    				__asm__ __volatile__ ("movec %1, %%caar\n\t"
    						      "movec %0, %%cacr"
    						      : /* no outputs */
    						      : "r" (cacr), "r" (addr));
    				addr += 4;
    			}
    		} else {
    			/* Flush the whole cache, even if page granularity requested. */
    			unsigned long cacr;
    			__asm__ ("movec %%cacr, %0" : "=r" (cacr));
    			if (cache & FLUSH_CACHE_INSN)
    				cacr |= 8;
    			if (cache & FLUSH_CACHE_DATA)
    				cacr |= 0x800;
    			__asm__ __volatile__ ("movec %0, %%cacr" : : "r" (cacr));
    		}
    		ret = 0;
    		goto out;
    	} else {
    	    /*
    	     * 040 or 060: don't blindly trust 'scope', someone could
    	     * try to flush a few megs of memory.
    	     */
    
    	    if (len>=3*PAGE_SIZE && scope<FLUSH_SCOPE_PAGE)
    	        scope=FLUSH_SCOPE_PAGE;
    	    if (len>=10*PAGE_SIZE && scope<FLUSH_SCOPE_ALL)
    	        scope=FLUSH_SCOPE_ALL;
    	    if (CPU_IS_040) {
    		ret = cache_flush_040 (addr, scope, cache, len);
    	    } else if (CPU_IS_060) {
    		ret = cache_flush_060 (addr, scope, cache, len);
    	    }
    	}
    out:
    	unlock_kernel();
    	return ret;
    }
    
    asmlinkage int sys_getpagesize(void)
    {
    	return PAGE_SIZE;
    }
    
    /*
     * 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 long __res asm ("%d0") = __NR_execve;
    	register long __a asm ("%d1") = (long)(filename);
    	register long __b asm ("%d2") = (long)(argv);
    	register long __c asm ("%d3") = (long)(envp);
    	asm volatile ("trap  #0" : "+d" (__res)
    			: "d" (__a), "d" (__b), "d" (__c));
    	return __res;
    }