arch/parisc/kernel/sys_parisc.c

   1
   2 /*
   3  *    PARISC specific syscalls
   4  *
   5  *    Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
   6  *    Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
   7  *    Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
   8  *
   9  *
  10  *    This program is free software; you can redistribute it and/or modify
  11  *    it under the terms of the GNU General Public License as published by
  12  *    the Free Software Foundation; either version 2 of the License, or
  13  *    (at your option) any later version.
  14  *
  15  *    This program is distributed in the hope that it will be useful,
  16  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *    GNU General Public License for more details.
  19  *
  20  *    You should have received a copy of the GNU General Public License
  21  *    along with this program; if not, write to the Free Software
  22  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include <asm/uaccess.h>
  26 #include <linux/file.h>
  27 #include <linux/fs.h>
  28 #include <linux/linkage.h>
  29 #include <linux/mm.h>
  30 #include <linux/mman.h>
  31 #include <linux/shm.h>
  32 #include <linux/smp_lock.h>
  33 #include <linux/syscalls.h>
  34
  35 int sys_pipe(int __user *fildes)
  36 {
  37         int fd[2];
  38         int error;
  39
  40         error = do_pipe(fd);
  41         if (!error) {
  42                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  43                         error = -EFAULT;
  44         }
  45         return error;
  46 }
  47
  48 static unsigned long get_unshared_area(unsigned long addr, unsigned long len)
  49 {
  50         struct vm_area_struct *vma;
  51
  52         addr = PAGE_ALIGN(addr);
  53
  54         for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
  55                 /* At this point:  (!vma || addr < vma->vm_end). */
  56                 if (TASK_SIZE - len < addr)
  57                         return -ENOMEM;
  58                 if (!vma || addr + len <= vma->vm_start)
  59                         return addr;
  60                 addr = vma->vm_end;
  61         }
  62 }
  63
  64 #define DCACHE_ALIGN(addr) (((addr) + (SHMLBA - 1)) &~ (SHMLBA - 1))
  65
  66 /*
  67  * We need to know the offset to use.  Old scheme was to look for
  68  * existing mapping and use the same offset.  New scheme is to use the
  69  * address of the kernel data structure as the seed for the offset.
  70  * We'll see how that works...
  71  *
  72  * The mapping is cacheline aligned, so there's no information in the bottom
  73  * few bits of the address.  We're looking for 10 bits (4MB / 4k), so let's
  74  * drop the bottom 8 bits and use bits 8-17.
  75  */
  76 static int get_offset(struct address_space *mapping)
  77 {
  78         int offset = (unsigned long) mapping << (PAGE_SHIFT - 8);
  79         return offset & 0x3FF000;
  80 }
  81
  82 static unsigned long get_shared_area(struct address_space *mapping,
  83                 unsigned long addr, unsigned long len, unsigned long pgoff)
  84 {
  85         struct vm_area_struct *vma;
  86         int offset = mapping ? get_offset(mapping) : 0;
  87
  88         addr = DCACHE_ALIGN(addr - offset) + offset;
  89
  90         for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
  91                 /* At this point:  (!vma || addr < vma->vm_end). */
  92                 if (TASK_SIZE - len < addr)
  93                         return -ENOMEM;
  94                 if (!vma || addr + len <= vma->vm_start)
  95                         return addr;
  96                 addr = DCACHE_ALIGN(vma->vm_end - offset) + offset;
  97                 if (addr < vma->vm_end) /* handle wraparound */
  98                         return -ENOMEM;
  99         }
 100 }
 101
 102 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
 103                 unsigned long len, unsigned long pgoff, unsigned long flags)
 104 {
 105         if (len > TASK_SIZE)
 106                 return -ENOMEM;
 107         if (!addr)
 108                 addr = TASK_UNMAPPED_BASE;
 109
 110         if (filp) {
 111                 addr = get_shared_area(filp->f_mapping, addr, len, pgoff);
 112         } else if(flags & MAP_SHARED) {
 113                 addr = get_shared_area(NULL, addr, len, pgoff);
 114         } else {
 115                 addr = get_unshared_area(addr, len);
 116         }
 117         return addr;
 118 }
 119
 120 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
 121         unsigned long prot, unsigned long flags, unsigned long fd,
 122         unsigned long pgoff)
 123 {
 124         struct file * file = NULL;
 125         unsigned long error = -EBADF;
 126         if (!(flags & MAP_ANONYMOUS)) {
 127                 file = fget(fd);
 128                 if (!file)
 129                         goto out;
 130         }
 131
 132         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 133
 134         down_write(&current->mm->mmap_sem);
 135         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 136         up_write(&current->mm->mmap_sem);
 137
 138         if (file != NULL)
 139                 fput(file);
 140 out:
 141         return error;
 142 }
 143
 144 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 145         unsigned long prot, unsigned long flags, unsigned long fd,
 146         unsigned long pgoff)
 147 {
 148         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 149            we have. */
 150         return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
 151 }
 152
 153 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 154                 unsigned long prot, unsigned long flags, unsigned long fd,
 155                 unsigned long offset)
 156 {
 157         if (!(offset & ~PAGE_MASK)) {
 158                 return do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
 159         } else {
 160                 return -EINVAL;
 161         }
 162 }
 163
 164 /* Fucking broken ABI */
 165
 166 #ifdef CONFIG_64BIT
 167 asmlinkage long parisc_truncate64(const char __user * path,
 168                                         unsigned int high, unsigned int low)
 169 {
 170         return sys_truncate(path, (long)high << 32 | low);
 171 }
 172
 173 asmlinkage long parisc_ftruncate64(unsigned int fd,
 174                                         unsigned int high, unsigned int low)
 175 {
 176         return sys_ftruncate(fd, (long)high << 32 | low);
 177 }
 178
 179 /* stubs for the benefit of the syscall_table since truncate64 and truncate
 180  * are identical on LP64 */
 181 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
 182 {
 183         return sys_truncate(path, length);
 184 }
 185 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
 186 {
 187         return sys_ftruncate(fd, length);
 188 }
 189 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
 190 {
 191         return sys_fcntl(fd, cmd, arg);
 192 }
 193 #else
 194
 195 asmlinkage long parisc_truncate64(const char __user * path,
 196                                         unsigned int high, unsigned int low)
 197 {
 198         return sys_truncate64(path, (loff_t)high << 32 | low);
 199 }
 200
 201 asmlinkage long parisc_ftruncate64(unsigned int fd,
 202                                         unsigned int high, unsigned int low)
 203 {
 204         return sys_ftruncate64(fd, (loff_t)high << 32 | low);
 205 }
 206 #endif
 207
 208 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
 209                                         unsigned int high, unsigned int low)
 210 {
 211         return sys_pread64(fd, buf, count, (loff_t)high << 32 | low);
 212 }
 213
 214 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
 215                         size_t count, unsigned int high, unsigned int low)
 216 {
 217         return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
 218 }
 219
 220 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
 221                                     size_t count)
 222 {
 223         return sys_readahead(fd, (loff_t)high << 32 | low, count);
 224 }
 225
 226 asmlinkage long parisc_fadvise64_64(int fd,
 227                         unsigned int high_off, unsigned int low_off,
 228                         unsigned int high_len, unsigned int low_len, int advice)
 229 {
 230         return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
 231                         (loff_t)high_len << 32 | low_len, advice);
 232 }
 233
 234 asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag)
 235 {
 236         return -ENOMEM;
 237 }
 238
 239 asmlinkage int sys_free_hugepages(unsigned long addr)
 240 {
 241         return -EINVAL;
 242 }