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