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 #include <linux/utsname.h>
  35 #include <linux/personality.h>
  36
  37 int sys_pipe(int __user *fildes)
  38 {
  39         int fd[2];
  40         int error;
  41
  42         error = do_pipe(fd);
  43         if (!error) {
  44                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  45                         error = -EFAULT;
  46         }
  47         return error;
  48 }
  49
  50 static unsigned long get_unshared_area(unsigned long addr, unsigned long len)
  51 {
  52         struct vm_area_struct *vma;
  53
  54         addr = PAGE_ALIGN(addr);
  55
  56         for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
  57                 /* At this point:  (!vma || addr < vma->vm_end). */
  58                 if (TASK_SIZE - len < addr)
  59                         return -ENOMEM;
  60                 if (!vma || addr + len <= vma->vm_start)
  61                         return addr;
  62                 addr = vma->vm_end;
  63         }
  64 }
  65
  66 #define DCACHE_ALIGN(addr) (((addr) + (SHMLBA - 1)) &~ (SHMLBA - 1))
  67
  68 /*
  69  * We need to know the offset to use.  Old scheme was to look for
  70  * existing mapping and use the same offset.  New scheme is to use the
  71  * address of the kernel data structure as the seed for the offset.
  72  * We'll see how that works...
  73  *
  74  * The mapping is cacheline aligned, so there's no information in the bottom
  75  * few bits of the address.  We're looking for 10 bits (4MB / 4k), so let's
  76  * drop the bottom 8 bits and use bits 8-17.
  77  */
  78 static int get_offset(struct address_space *mapping)
  79 {
  80         int offset = (unsigned long) mapping << (PAGE_SHIFT - 8);
  81         return offset & 0x3FF000;
  82 }
  83
  84 static unsigned long get_shared_area(struct address_space *mapping,
  85                 unsigned long addr, unsigned long len, unsigned long pgoff)
  86 {
  87         struct vm_area_struct *vma;
  88         int offset = mapping ? get_offset(mapping) : 0;
  89
  90         addr = DCACHE_ALIGN(addr - offset) + offset;
  91
  92         for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
  93                 /* At this point:  (!vma || addr < vma->vm_end). */
  94                 if (TASK_SIZE - len < addr)
  95                         return -ENOMEM;
  96                 if (!vma || addr + len <= vma->vm_start)
  97                         return addr;
  98                 addr = DCACHE_ALIGN(vma->vm_end - offset) + offset;
  99                 if (addr < vma->vm_end) /* handle wraparound */
 100                         return -ENOMEM;
 101         }
 102 }
 103
 104 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
 105                 unsigned long len, unsigned long pgoff, unsigned long flags)
 106 {
 107         if (len > TASK_SIZE)
 108                 return -ENOMEM;
 109         if (!addr)
 110                 addr = TASK_UNMAPPED_BASE;
 111
 112         if (filp) {
 113                 addr = get_shared_area(filp->f_mapping, addr, len, pgoff);
 114         } else if(flags & MAP_SHARED) {
 115                 addr = get_shared_area(NULL, addr, len, pgoff);
 116         } else {
 117                 addr = get_unshared_area(addr, len);
 118         }
 119         return addr;
 120 }
 121
 122 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
 123         unsigned long prot, unsigned long flags, unsigned long fd,
 124         unsigned long pgoff)
 125 {
 126         struct file * file = NULL;
 127         unsigned long error = -EBADF;
 128         if (!(flags & MAP_ANONYMOUS)) {
 129                 file = fget(fd);
 130                 if (!file)
 131                         goto out;
 132         }
 133
 134         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 135
 136         down_write(&current->mm->mmap_sem);
 137         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 138         up_write(&current->mm->mmap_sem);
 139
 140         if (file != NULL)
 141                 fput(file);
 142 out:
 143         return error;
 144 }
 145
 146 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 147         unsigned long prot, unsigned long flags, unsigned long fd,
 148         unsigned long pgoff)
 149 {
 150         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 151            we have. */
 152         return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
 153 }
 154
 155 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 156                 unsigned long prot, unsigned long flags, unsigned long fd,
 157                 unsigned long offset)
 158 {
 159         if (!(offset & ~PAGE_MASK)) {
 160                 return do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
 161         } else {
 162                 return -EINVAL;
 163         }
 164 }
 165
 166 /* Fucking broken ABI */
 167
 168 #ifdef CONFIG_64BIT
 169 asmlinkage long parisc_truncate64(const char __user * path,
 170                                         unsigned int high, unsigned int low)
 171 {
 172         return sys_truncate(path, (long)high << 32 | low);
 173 }
 174
 175 asmlinkage long parisc_ftruncate64(unsigned int fd,
 176                                         unsigned int high, unsigned int low)
 177 {
 178         return sys_ftruncate(fd, (long)high << 32 | low);
 179 }
 180
 181 /* stubs for the benefit of the syscall_table since truncate64 and truncate
 182  * are identical on LP64 */
 183 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
 184 {
 185         return sys_truncate(path, length);
 186 }
 187 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
 188 {
 189         return sys_ftruncate(fd, length);
 190 }
 191 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
 192 {
 193         return sys_fcntl(fd, cmd, arg);
 194 }
 195 #else
 196
 197 asmlinkage long parisc_truncate64(const char __user * path,
 198                                         unsigned int high, unsigned int low)
 199 {
 200         return sys_truncate64(path, (loff_t)high << 32 | low);
 201 }
 202
 203 asmlinkage long parisc_ftruncate64(unsigned int fd,
 204                                         unsigned int high, unsigned int low)
 205 {
 206         return sys_ftruncate64(fd, (loff_t)high << 32 | low);
 207 }
 208 #endif
 209
 210 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
 211                                         unsigned int high, unsigned int low)
 212 {
 213         return sys_pread64(fd, buf, count, (loff_t)high << 32 | low);
 214 }
 215
 216 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
 217                         size_t count, unsigned int high, unsigned int low)
 218 {
 219         return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
 220 }
 221
 222 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
 223                                     size_t count)
 224 {
 225         return sys_readahead(fd, (loff_t)high << 32 | low, count);
 226 }
 227
 228 asmlinkage long parisc_fadvise64_64(int fd,
 229                         unsigned int high_off, unsigned int low_off,
 230                         unsigned int high_len, unsigned int low_len, int advice)
 231 {
 232         return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
 233                         (loff_t)high_len << 32 | low_len, advice);
 234 }
 235
 236 asmlinkage long parisc_sync_file_range(int fd,
 237                         u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
 238                         unsigned int flags)
 239 {
 240         return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
 241                         (loff_t)hi_nbytes << 32 | lo_nbytes, flags);
 242 }
 243
 244 asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag)
 245 {
 246         return -ENOMEM;
 247 }
 248
 249 asmlinkage int sys_free_hugepages(unsigned long addr)
 250 {
 251         return -EINVAL;
 252 }
 253
 254 long parisc_personality(unsigned long personality)
 255 {
 256         long err;
 257
 258         if (personality(current->personality) == PER_LINUX32
 259             && personality == PER_LINUX)
 260                 personality = PER_LINUX32;
 261
 262         err = sys_personality(personality);
 263         if (err == PER_LINUX32)
 264                 err = PER_LINUX;
 265
 266         return err;
 267 }
 268
 269 long parisc_newuname(struct new_utsname __user *name)
 270 {
 271         int err = sys_newuname(name);
 272
 273 #ifdef CONFIG_COMPAT
 274         if (!err && personality(current->personality) == PER_LINUX32) {
 275                 if (__put_user(0, name->machine + 6) ||
 276                     __put_user(0, name->machine + 7))
 277                         err = -EFAULT;
 278         }
 279 #endif
 280
 281         return err;
 282 }