release/src-rt-6.x/linux/linux-2.6/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 int sys_pipe(int __user *fildes)
  37 {
  38         int fd[2];
  39         int error;
  40
  41         error = do_pipe(fd);
  42         if (!error) {
  43                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  44                         error = -EFAULT;
  45         }
  46         return error;
  47 }
  48
  49 static unsigned long get_unshared_area(unsigned long addr, unsigned long len)
  50 {
  51         struct vm_area_struct *vma;
  52
  53         addr = PAGE_ALIGN(addr);
  54
  55         for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
  56                 /* At this point:  (!vma || addr < vma->vm_end). */
  57                 if (TASK_SIZE - len < addr)
  58                         return -ENOMEM;
  59                 if (!vma || addr + len <= vma->vm_start)
  60                         return addr;
  61                 addr = vma->vm_end;
  62         }
  63 }
  64
  65 #define DCACHE_ALIGN(addr) (((addr) + (SHMLBA - 1)) &~ (SHMLBA - 1))
  66
  67 /*
  68  * We need to know the offset to use.  Old scheme was to look for
  69  * existing mapping and use the same offset.  New scheme is to use the
  70  * address of the kernel data structure as the seed for the offset.
  71  * We'll see how that works...
  72  *
  73  * The mapping is cacheline aligned, so there's no information in the bottom
  74  * few bits of the address.  We're looking for 10 bits (4MB / 4k), so let's
  75  * drop the bottom 8 bits and use bits 8-17.
  76  */
  77 static int get_offset(struct address_space *mapping)
  78 {
  79         int offset = (unsigned long) mapping << (PAGE_SHIFT - 8);
  80         return offset & 0x3FF000;
  81 }
  82
  83 static unsigned long get_shared_area(struct address_space *mapping,
  84                 unsigned long addr, unsigned long len, unsigned long pgoff)
  85 {
  86         struct vm_area_struct *vma;
  87         int offset = mapping ? get_offset(mapping) : 0;
  88
  89         addr = DCACHE_ALIGN(addr - offset) + offset;
  90
  91         for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
  92                 /* At this point:  (!vma || addr < vma->vm_end). */
  93                 if (TASK_SIZE - len < addr)
  94                         return -ENOMEM;
  95                 if (!vma || addr + len <= vma->vm_start)
  96                         return addr;
  97                 addr = DCACHE_ALIGN(vma->vm_end - offset) + offset;
  98                 if (addr < vma->vm_end) /* handle wraparound */
  99                         return -ENOMEM;
 100         }
 101 }
 102
 103 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
 104                 unsigned long len, unsigned long pgoff, unsigned long flags)
 105 {
 106         if (len > TASK_SIZE)
 107                 return -ENOMEM;
 108         /* Might want to check for cache aliasing issues for MAP_FIXED case
 109          * like ARM or MIPS ??? --BenH.
 110          */
 111         if (flags & MAP_FIXED)
 112                 return addr;
 113         if (!addr)
 114                 addr = TASK_UNMAPPED_BASE;
 115
 116         if (filp) {
 117                 addr = get_shared_area(filp->f_mapping, addr, len, pgoff);
 118         } else if(flags & MAP_SHARED) {
 119                 addr = get_shared_area(NULL, addr, len, pgoff);
 120         } else {
 121                 addr = get_unshared_area(addr, len);
 122         }
 123         return addr;
 124 }
 125
 126 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
 127         unsigned long prot, unsigned long flags, unsigned long fd,
 128         unsigned long pgoff)
 129 {
 130         struct file * file = NULL;
 131         unsigned long error = -EBADF;
 132         if (!(flags & MAP_ANONYMOUS)) {
 133                 file = fget(fd);
 134                 if (!file)
 135                         goto out;
 136         }
 137
 138         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 139
 140         down_write(&current->mm->mmap_sem);
 141         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 142         up_write(&current->mm->mmap_sem);
 143
 144         if (file != NULL)
 145                 fput(file);
 146 out:
 147         return error;
 148 }
 149
 150 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 151         unsigned long prot, unsigned long flags, unsigned long fd,
 152         unsigned long pgoff)
 153 {
 154         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 155            we have. */
 156         return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
 157 }
 158
 159 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 160                 unsigned long prot, unsigned long flags, unsigned long fd,
 161                 unsigned long offset)
 162 {
 163         if (!(offset & ~PAGE_MASK)) {
 164                 return do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
 165         } else {
 166                 return -EINVAL;
 167         }
 168 }
 169
 170 /* Fucking broken ABI */
 171
 172 #ifdef CONFIG_64BIT
 173 asmlinkage long parisc_truncate64(const char __user * path,
 174                                         unsigned int high, unsigned int low)
 175 {
 176         return sys_truncate(path, (long)high << 32 | low);
 177 }
 178
 179 asmlinkage long parisc_ftruncate64(unsigned int fd,
 180                                         unsigned int high, unsigned int low)
 181 {
 182         return sys_ftruncate(fd, (long)high << 32 | low);
 183 }
 184
 185 /* stubs for the benefit of the syscall_table since truncate64 and truncate
 186  * are identical on LP64 */
 187 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
 188 {
 189         return sys_truncate(path, length);
 190 }
 191 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
 192 {
 193         return sys_ftruncate(fd, length);
 194 }
 195 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
 196 {
 197         return sys_fcntl(fd, cmd, arg);
 198 }
 199 #else
 200
 201 asmlinkage long parisc_truncate64(const char __user * path,
 202                                         unsigned int high, unsigned int low)
 203 {
 204         return sys_truncate64(path, (loff_t)high << 32 | low);
 205 }
 206
 207 asmlinkage long parisc_ftruncate64(unsigned int fd,
 208                                         unsigned int high, unsigned int low)
 209 {
 210         return sys_ftruncate64(fd, (loff_t)high << 32 | low);
 211 }
 212 #endif
 213
 214 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
 215                                         unsigned int high, unsigned int low)
 216 {
 217         return sys_pread64(fd, buf, count, (loff_t)high << 32 | low);
 218 }
 219
 220 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
 221                         size_t count, unsigned int high, unsigned int low)
 222 {
 223         return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
 224 }
 225
 226 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
 227                                     size_t count)
 228 {
 229         return sys_readahead(fd, (loff_t)high << 32 | low, count);
 230 }
 231
 232 asmlinkage long parisc_fadvise64_64(int fd,
 233                         unsigned int high_off, unsigned int low_off,
 234                         unsigned int high_len, unsigned int low_len, int advice)
 235 {
 236         return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
 237                         (loff_t)high_len << 32 | low_len, advice);
 238 }
 239
 240 asmlinkage long parisc_sync_file_range(int fd,
 241                         u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
 242                         unsigned int flags)
 243 {
 244         return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
 245                         (loff_t)hi_nbytes << 32 | lo_nbytes, flags);
 246 }
 247
 248 asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag)
 249 {
 250         return -ENOMEM;
 251 }
 252
 253 asmlinkage int sys_free_hugepages(unsigned long addr)
 254 {
 255         return -EINVAL;
 256 }
 257
 258 long parisc_personality(unsigned long personality)
 259 {
 260         long err;
 261
 262         if (personality(current->personality) == PER_LINUX32
 263             && personality == PER_LINUX)
 264                 personality = PER_LINUX32;
 265
 266         err = sys_personality(personality);
 267         if (err == PER_LINUX32)
 268                 err = PER_LINUX;
 269
 270         return err;
 271 }
 272
 273 long parisc_newuname(struct new_utsname __user *name)
 274 {
 275         int err = sys_newuname(name);
 276
 277 #ifdef CONFIG_COMPAT
 278         if (!err && personality(current->personality) == PER_LINUX32) {
 279                 if (__put_user(0, name->machine + 6) ||
 280                     __put_user(0, name->machine + 7))
 281                         err = -EFAULT;
 282         }
 283 #endif
 284
 285         return err;
 286 }