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