arch/ia64/kernel/sys_ia64.c

   1 /*
   2  * This file contains various system calls that have different calling
   3  * conventions on different platforms.
   4  *
   5  * Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  */
   8 #include <linux/errno.h>
   9 #include <linux/fs.h>
  10 #include <linux/mm.h>
  11 #include <linux/mman.h>
  12 #include <linux/sched.h>
  13 #include <linux/sched/mm.h>
  14 #include <linux/sched/task_stack.h>
  15 #include <linux/shm.h>
  16 #include <linux/file.h>         /* doh, must come after sched.h... */
  17 #include <linux/smp.h>
  18 #include <linux/syscalls.h>
  19 #include <linux/highuid.h>
  20 #include <linux/hugetlb.h>
  21
  22 #include <asm/shmparam.h>
  23 #include <linux/uaccess.h>
  24
  25 unsigned long
  26 arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len,
  27                         unsigned long pgoff, unsigned long flags)
  28 {
  29         long map_shared = (flags & MAP_SHARED);
  30         unsigned long align_mask = 0;
  31         struct mm_struct *mm = current->mm;
  32         struct vm_unmapped_area_info info;
  33
  34         if (len > RGN_MAP_LIMIT)
  35                 return -ENOMEM;
  36
  37         /* handle fixed mapping: prevent overlap with huge pages */
  38         if (flags & MAP_FIXED) {
  39                 if (is_hugepage_only_range(mm, addr, len))
  40                         return -EINVAL;
  41                 return addr;
  42         }
  43
  44 #ifdef CONFIG_HUGETLB_PAGE
  45         if (REGION_NUMBER(addr) == RGN_HPAGE)
  46                 addr = 0;
  47 #endif
  48         if (!addr)
  49                 addr = TASK_UNMAPPED_BASE;
  50
  51         if (map_shared && (TASK_SIZE > 0xfffffffful))
  52                 /*
  53                  * For 64-bit tasks, align shared segments to 1MB to avoid potential
  54                  * performance penalty due to virtual aliasing (see ASDM).  For 32-bit
  55                  * tasks, we prefer to avoid exhausting the address space too quickly by
  56                  * limiting alignment to a single page.
  57                  */
  58                 align_mask = PAGE_MASK & (SHMLBA - 1);
  59
  60         info.flags = 0;
  61         info.length = len;
  62         info.low_limit = addr;
  63         info.high_limit = TASK_SIZE;
  64         info.align_mask = align_mask;
  65         info.align_offset = 0;
  66         return vm_unmapped_area(&info);
  67 }
  68
  69 asmlinkage long
  70 ia64_getpriority (int which, int who)
  71 {
  72         long prio;
  73
  74         prio = sys_getpriority(which, who);
  75         if (prio >= 0) {
  76                 force_successful_syscall_return();
  77                 prio = 20 - prio;
  78         }
  79         return prio;
  80 }
  81
  82 /* XXX obsolete, but leave it here until the old libc is gone... */
  83 asmlinkage unsigned long
  84 sys_getpagesize (void)
  85 {
  86         return PAGE_SIZE;
  87 }
  88
  89 asmlinkage unsigned long
  90 ia64_brk (unsigned long brk)
  91 {
  92         unsigned long retval = sys_brk(brk);
  93         force_successful_syscall_return();
  94         return retval;
  95 }
  96
  97 /*
  98  * On IA-64, we return the two file descriptors in ret0 and ret1 (r8
  99  * and r9) as this is faster than doing a copy_to_user().
 100  */
 101 asmlinkage long
 102 sys_ia64_pipe (void)
 103 {
 104         struct pt_regs *regs = task_pt_regs(current);
 105         int fd[2];
 106         int retval;
 107
 108         retval = do_pipe_flags(fd, 0);
 109         if (retval)
 110                 goto out;
 111         retval = fd[0];
 112         regs->r9 = fd[1];
 113   out:
 114         return retval;
 115 }
 116
 117 int ia64_mmap_check(unsigned long addr, unsigned long len,
 118                 unsigned long flags)
 119 {
 120         unsigned long roff;
 121
 122         /*
 123          * Don't permit mappings into unmapped space, the virtual page table
 124          * of a region, or across a region boundary.  Note: RGN_MAP_LIMIT is
 125          * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0.
 126          */
 127         roff = REGION_OFFSET(addr);
 128         if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len)))
 129                 return -EINVAL;
 130         return 0;
 131 }
 132
 133 /*
 134  * mmap2() is like mmap() except that the offset is expressed in units
 135  * of PAGE_SIZE (instead of bytes).  This allows to mmap2() (pieces
 136  * of) files that are larger than the address space of the CPU.
 137  */
 138 asmlinkage unsigned long
 139 sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
 140 {
 141         addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
 142         if (!IS_ERR((void *) addr))
 143                 force_successful_syscall_return();
 144         return addr;
 145 }
 146
 147 asmlinkage unsigned long
 148 sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off)
 149 {
 150         if (offset_in_page(off) != 0)
 151                 return -EINVAL;
 152
 153         addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 154         if (!IS_ERR((void *) addr))
 155                 force_successful_syscall_return();
 156         return addr;
 157 }
 158
 159 asmlinkage unsigned long
 160 ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags,
 161              unsigned long new_addr)
 162 {
 163         addr = sys_mremap(addr, old_len, new_len, flags, new_addr);
 164         if (!IS_ERR((void *) addr))
 165                 force_successful_syscall_return();
 166         return addr;
 167 }
 168
 169 #ifndef CONFIG_PCI
 170
 171 asmlinkage long
 172 sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
 173                     void *buf)
 174 {
 175         return -ENOSYS;
 176 }
 177
 178 asmlinkage long
 179 sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
 180                      void *buf)
 181 {
 182         return -ENOSYS;
 183 }
 184
 185 #endif /* CONFIG_PCI */