Logo Search packages:      
Sourcecode: linux version File versions

sys_ia64.c

/*
 * This file contains various system calls that have different calling
 * conventions on different platforms.
 *
 * Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co
 *    David Mosberger-Tang <davidm@hpl.hp.com>
 */
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/sched.h>
#include <linux/shm.h>
#include <linux/file.h>       /* doh, must come after sched.h... */
#include <linux/smp.h>
#include <linux/syscalls.h>
#include <linux/highuid.h>
#include <linux/hugetlb.h>

#include <asm/shmparam.h>
#include <asm/uaccess.h>

unsigned long
arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len,
                  unsigned long pgoff, unsigned long flags)
{
      long map_shared = (flags & MAP_SHARED);
      unsigned long start_addr, align_mask = PAGE_SIZE - 1;
      struct mm_struct *mm = current->mm;
      struct vm_area_struct *vma;

      if (len > RGN_MAP_LIMIT)
            return -ENOMEM;

      /* handle fixed mapping: prevent overlap with huge pages */
      if (flags & MAP_FIXED) {
            if (is_hugepage_only_range(mm, addr, len))
                  return -EINVAL;
            return addr;
      }

#ifdef CONFIG_HUGETLB_PAGE
      if (REGION_NUMBER(addr) == RGN_HPAGE)
            addr = 0;
#endif
      if (!addr)
            addr = mm->free_area_cache;

      if (map_shared && (TASK_SIZE > 0xfffffffful))
            /*
             * For 64-bit tasks, align shared segments to 1MB to avoid potential
             * performance penalty due to virtual aliasing (see ASDM).  For 32-bit
             * tasks, we prefer to avoid exhausting the address space too quickly by
             * limiting alignment to a single page.
             */
            align_mask = SHMLBA - 1;

  full_search:
      start_addr = addr = (addr + align_mask) & ~align_mask;

      for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
            /* At this point:  (!vma || addr < vma->vm_end). */
            if (TASK_SIZE - len < addr || RGN_MAP_LIMIT - len < REGION_OFFSET(addr)) {
                  if (start_addr != TASK_UNMAPPED_BASE) {
                        /* Start a new search --- just in case we missed some holes.  */
                        addr = TASK_UNMAPPED_BASE;
                        goto full_search;
                  }
                  return -ENOMEM;
            }
            if (!vma || addr + len <= vma->vm_start) {
                  /* Remember the address where we stopped this search:  */
                  mm->free_area_cache = addr + len;
                  return addr;
            }
            addr = (vma->vm_end + align_mask) & ~align_mask;
      }
}

asmlinkage long
ia64_getpriority (int which, int who)
{
      long prio;

      prio = sys_getpriority(which, who);
      if (prio >= 0) {
            force_successful_syscall_return();
            prio = 20 - prio;
      }
      return prio;
}

/* XXX obsolete, but leave it here until the old libc is gone... */
asmlinkage unsigned long
sys_getpagesize (void)
{
      return PAGE_SIZE;
}

asmlinkage unsigned long
ia64_brk (unsigned long brk)
{
      unsigned long rlim, retval, newbrk, oldbrk;
      struct mm_struct *mm = current->mm;

      /*
       * Most of this replicates the code in sys_brk() except for an additional safety
       * check and the clearing of r8.  However, we can't call sys_brk() because we need
       * to acquire the mmap_sem before we can do the test...
       */
      down_write(&mm->mmap_sem);

      if (brk < mm->end_code)
            goto out;
      newbrk = PAGE_ALIGN(brk);
      oldbrk = PAGE_ALIGN(mm->brk);
      if (oldbrk == newbrk)
            goto set_brk;

      /* Always allow shrinking brk. */
      if (brk <= mm->brk) {
            if (!do_munmap(mm, newbrk, oldbrk-newbrk))
                  goto set_brk;
            goto out;
      }

      /* Check against unimplemented/unmapped addresses: */
      if ((newbrk - oldbrk) > RGN_MAP_LIMIT || REGION_OFFSET(newbrk) > RGN_MAP_LIMIT)
            goto out;

      /* Check against rlimit.. */
      rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
      if (rlim < RLIM_INFINITY && brk - mm->start_data > rlim)
            goto out;

      /* Check against existing mmap mappings. */
      if (find_vma_intersection(mm, oldbrk, newbrk+PAGE_SIZE))
            goto out;

      /* Ok, looks good - let it rip. */
      if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk)
            goto out;
set_brk:
      mm->brk = brk;
out:
      retval = mm->brk;
      up_write(&mm->mmap_sem);
      force_successful_syscall_return();
      return retval;
}

/*
 * On IA-64, we return the two file descriptors in ret0 and ret1 (r8
 * and r9) as this is faster than doing a copy_to_user().
 */
asmlinkage long
sys_pipe (void)
{
      struct pt_regs *regs = task_pt_regs(current);
      int fd[2];
      int retval;

      retval = do_pipe_flags(fd, 0);
      if (retval)
            goto out;
      retval = fd[0];
      regs->r9 = fd[1];
  out:
      return retval;
}

int ia64_mmap_check(unsigned long addr, unsigned long len,
            unsigned long flags)
{
      unsigned long roff;

      /*
       * Don't permit mappings into unmapped space, the virtual page table
       * of a region, or across a region boundary.  Note: RGN_MAP_LIMIT is
       * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0.
       */
      roff = REGION_OFFSET(addr);
      if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len)))
            return -EINVAL;
      return 0;
}

static inline unsigned long
do_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, unsigned long pgoff)
{
      struct file *file = NULL;

      flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
      if (!(flags & MAP_ANONYMOUS)) {
            file = fget(fd);
            if (!file)
                  return -EBADF;

            if (!file->f_op || !file->f_op->mmap) {
                  addr = -ENODEV;
                  goto out;
            }
      }

      /* Careful about overflows.. */
      len = PAGE_ALIGN(len);
      if (!len || len > TASK_SIZE) {
            addr = -EINVAL;
            goto out;
      }

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

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

/*
 * mmap2() is like mmap() except that the offset is expressed in units
 * of PAGE_SIZE (instead of bytes).  This allows to mmap2() (pieces
 * of) files that are larger than the address space of the CPU.
 */
asmlinkage unsigned long
sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
{
      addr = do_mmap2(addr, len, prot, flags, fd, pgoff);
      if (!IS_ERR((void *) addr))
            force_successful_syscall_return();
      return addr;
}

asmlinkage unsigned long
sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off)
{
      if (offset_in_page(off) != 0)
            return -EINVAL;

      addr = do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
      if (!IS_ERR((void *) addr))
            force_successful_syscall_return();
      return addr;
}

asmlinkage unsigned long
ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags,
           unsigned long new_addr)
{
      extern unsigned long do_mremap (unsigned long addr,
                              unsigned long old_len,
                              unsigned long new_len,
                              unsigned long flags,
                              unsigned long new_addr);

      down_write(&current->mm->mmap_sem);
      {
            addr = do_mremap(addr, old_len, new_len, flags, new_addr);
      }
      up_write(&current->mm->mmap_sem);

      if (IS_ERR((void *) addr))
            return addr;

      force_successful_syscall_return();
      return addr;
}

#ifndef CONFIG_PCI

asmlinkage long
sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
                void *buf)
{
      return -ENOSYS;
}

asmlinkage long
sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
                 void *buf)
{
      return -ENOSYS;
}

#endif /* CONFIG_PCI */

Generated by  Doxygen 1.6.0   Back to index