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_unmapped_area_info info;
  39
  40         info.flags = 0;
  41         info.length = len;
  42         info.low_limit = PAGE_ALIGN(addr);
  43         info.high_limit = TASK_SIZE;
  44         info.align_mask = 0;
  45         info.align_offset = 0;
  46         return vm_unmapped_area(&info);
  47 }
  48
  49 /*
  50  * We need to know the offset to use.  Old scheme was to look for
  51  * existing mapping and use the same offset.  New scheme is to use the
  52  * address of the kernel data structure as the seed for the offset.
  53  * We'll see how that works...
  54  *
  55  * The mapping is cacheline aligned, so there's no information in the bottom
  56  * few bits of the address.  We're looking for 10 bits (4MB / 4k), so let's
  57  * drop the bottom 8 bits and use bits 8-17.
  58  */
  59 static int get_offset(struct address_space *mapping)
  60 {
  61         return (unsigned long) mapping >> 8;
  62 }
  63
  64 static unsigned long shared_align_offset(struct file *filp, unsigned long pgoff)
  65 {
  66         struct address_space *mapping = filp ? filp->f_mapping : NULL;
  67
  68         return (get_offset(mapping) + pgoff) << PAGE_SHIFT;
  69 }
  70
  71 static unsigned long get_shared_area(struct file *filp, unsigned long addr,
  72                 unsigned long len, unsigned long pgoff)
  73 {
  74         struct vm_unmapped_area_info info;
  75
  76         info.flags = 0;
  77         info.length = len;
  78         info.low_limit = PAGE_ALIGN(addr);
  79         info.high_limit = TASK_SIZE;
  80         info.align_mask = PAGE_MASK & (SHMLBA - 1);
  81         info.align_offset = shared_align_offset(filp, pgoff);
  82         return vm_unmapped_area(&info);
  83 }
  84
  85 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
  86                 unsigned long len, unsigned long pgoff, unsigned long flags)
  87 {
  88         if (len > TASK_SIZE)
  89                 return -ENOMEM;
  90         if (flags & MAP_FIXED) {
  91                 if ((flags & MAP_SHARED) &&
  92                     (addr - shared_align_offset(filp, pgoff)) & (SHMLBA - 1))
  93                         return -EINVAL;
  94                 return addr;
  95         }
  96         if (!addr)
  97                 addr = TASK_UNMAPPED_BASE;
  98
  99         if (filp || (flags & MAP_SHARED))
 100                 addr = get_shared_area(filp, addr, len, pgoff);
 101         else
 102                 addr = get_unshared_area(addr, len);
 103
 104         return addr;
 105 }
 106
 107 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 108         unsigned long prot, unsigned long flags, unsigned long fd,
 109         unsigned long pgoff)
 110 {
 111         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 112            we have. */
 113         return sys_mmap_pgoff(addr, len, prot, flags, fd,
 114                               pgoff >> (PAGE_SHIFT - 12));
 115 }
 116
 117 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 118                 unsigned long prot, unsigned long flags, unsigned long fd,
 119                 unsigned long offset)
 120 {
 121         if (!(offset & ~PAGE_MASK)) {
 122                 return sys_mmap_pgoff(addr, len, prot, flags, fd,
 123                                         offset >> PAGE_SHIFT);
 124         } else {
 125                 return -EINVAL;
 126         }
 127 }
 128
 129 /* Fucking broken ABI */
 130
 131 #ifdef CONFIG_64BIT
 132 asmlinkage long parisc_truncate64(const char __user * path,
 133                                         unsigned int high, unsigned int low)
 134 {
 135         return sys_truncate(path, (long)high << 32 | low);
 136 }
 137
 138 asmlinkage long parisc_ftruncate64(unsigned int fd,
 139                                         unsigned int high, unsigned int low)
 140 {
 141         return sys_ftruncate(fd, (long)high << 32 | low);
 142 }
 143
 144 /* stubs for the benefit of the syscall_table since truncate64 and truncate
 145  * are identical on LP64 */
 146 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
 147 {
 148         return sys_truncate(path, length);
 149 }
 150 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
 151 {
 152         return sys_ftruncate(fd, length);
 153 }
 154 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
 155 {
 156         return sys_fcntl(fd, cmd, arg);
 157 }
 158 #else
 159
 160 asmlinkage long parisc_truncate64(const char __user * path,
 161                                         unsigned int high, unsigned int low)
 162 {
 163         return sys_truncate64(path, (loff_t)high << 32 | low);
 164 }
 165
 166 asmlinkage long parisc_ftruncate64(unsigned int fd,
 167                                         unsigned int high, unsigned int low)
 168 {
 169         return sys_ftruncate64(fd, (loff_t)high << 32 | low);
 170 }
 171 #endif
 172
 173 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
 174                                         unsigned int high, unsigned int low)
 175 {
 176         return sys_pread64(fd, buf, count, (loff_t)high << 32 | low);
 177 }
 178
 179 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
 180                         size_t count, unsigned int high, unsigned int low)
 181 {
 182         return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
 183 }
 184
 185 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
 186                                     size_t count)
 187 {
 188         return sys_readahead(fd, (loff_t)high << 32 | low, count);
 189 }
 190
 191 asmlinkage long parisc_fadvise64_64(int fd,
 192                         unsigned int high_off, unsigned int low_off,
 193                         unsigned int high_len, unsigned int low_len, int advice)
 194 {
 195         return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
 196                         (loff_t)high_len << 32 | low_len, advice);
 197 }
 198
 199 asmlinkage long parisc_sync_file_range(int fd,
 200                         u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
 201                         unsigned int flags)
 202 {
 203         return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
 204                         (loff_t)hi_nbytes << 32 | lo_nbytes, flags);
 205 }
 206
 207 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo,
 208                                 u32 lenhi, u32 lenlo)
 209 {
 210         return sys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,
 211                              ((u64)lenhi << 32) | lenlo);
 212 }
 213
 214 asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag)
 215 {
 216         return -ENOMEM;
 217 }
 218
 219 asmlinkage int sys_free_hugepages(unsigned long addr)
 220 {
 221         return -EINVAL;
 222 }
 223
 224 long parisc_personality(unsigned long personality)
 225 {
 226         long err;
 227
 228         if (personality(current->personality) == PER_LINUX32
 229             && personality(personality) == PER_LINUX)
 230                 personality = (personality & ~PER_MASK) | PER_LINUX32;
 231
 232         err = sys_personality(personality);
 233         if (personality(err) == PER_LINUX32)
 234                 err = (err & ~PER_MASK) | PER_LINUX;
 235
 236         return err;
 237 }