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         offset = (offset + (pgoff << PAGE_SHIFT)) & 0x3FF000;
  77
  78         addr = DCACHE_ALIGN(addr - offset) + offset;
  79
  80         for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
  81                 /* At this point:  (!vma || addr < vma->vm_end). */
  82                 if (TASK_SIZE - len < addr)
  83                         return -ENOMEM;
  84                 if (!vma || addr + len <= vma->vm_start)
  85                         return addr;
  86                 addr = DCACHE_ALIGN(vma->vm_end - offset) + offset;
  87                 if (addr < vma->vm_end) /* handle wraparound */
  88                         return -ENOMEM;
  89         }
  90 }
  91
  92 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
  93                 unsigned long len, unsigned long pgoff, unsigned long flags)
  94 {
  95         if (len > TASK_SIZE)
  96                 return -ENOMEM;
  97         /* Might want to check for cache aliasing issues for MAP_FIXED case
  98          * like ARM or MIPS ??? --BenH.
  99          */
 100         if (flags & MAP_FIXED)
 101                 return addr;
 102         if (!addr)
 103                 addr = TASK_UNMAPPED_BASE;
 104
 105         if (filp) {
 106                 addr = get_shared_area(filp->f_mapping, addr, len, pgoff);
 107         } else if(flags & MAP_SHARED) {
 108                 addr = get_shared_area(NULL, addr, len, pgoff);
 109         } else {
 110                 addr = get_unshared_area(addr, len);
 111         }
 112         return addr;
 113 }
 114
 115 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 116         unsigned long prot, unsigned long flags, unsigned long fd,
 117         unsigned long pgoff)
 118 {
 119         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 120            we have. */
 121         return sys_mmap_pgoff(addr, len, prot, flags, fd,
 122                               pgoff >> (PAGE_SHIFT - 12));
 123 }
 124
 125 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 126                 unsigned long prot, unsigned long flags, unsigned long fd,
 127                 unsigned long offset)
 128 {
 129         if (!(offset & ~PAGE_MASK)) {
 130                 return sys_mmap_pgoff(addr, len, prot, flags, fd,
 131                                         offset >> PAGE_SHIFT);
 132         } else {
 133                 return -EINVAL;
 134         }
 135 }
 136
 137 /* Fucking broken ABI */
 138
 139 #ifdef CONFIG_64BIT
 140 asmlinkage long parisc_truncate64(const char __user * path,
 141                                         unsigned int high, unsigned int low)
 142 {
 143         return sys_truncate(path, (long)high << 32 | low);
 144 }
 145
 146 asmlinkage long parisc_ftruncate64(unsigned int fd,
 147                                         unsigned int high, unsigned int low)
 148 {
 149         return sys_ftruncate(fd, (long)high << 32 | low);
 150 }
 151
 152 /* stubs for the benefit of the syscall_table since truncate64 and truncate
 153  * are identical on LP64 */
 154 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
 155 {
 156         return sys_truncate(path, length);
 157 }
 158 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
 159 {
 160         return sys_ftruncate(fd, length);
 161 }
 162 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
 163 {
 164         return sys_fcntl(fd, cmd, arg);
 165 }
 166 #else
 167
 168 asmlinkage long parisc_truncate64(const char __user * path,
 169                                         unsigned int high, unsigned int low)
 170 {
 171         return sys_truncate64(path, (loff_t)high << 32 | low);
 172 }
 173
 174 asmlinkage long parisc_ftruncate64(unsigned int fd,
 175                                         unsigned int high, unsigned int low)
 176 {
 177         return sys_ftruncate64(fd, (loff_t)high << 32 | low);
 178 }
 179 #endif
 180
 181 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
 182                                         unsigned int high, unsigned int low)
 183 {
 184         return sys_pread64(fd, buf, count, (loff_t)high << 32 | low);
 185 }
 186
 187 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
 188                         size_t count, unsigned int high, unsigned int low)
 189 {
 190         return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
 191 }
 192
 193 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
 194                                     size_t count)
 195 {
 196         return sys_readahead(fd, (loff_t)high << 32 | low, count);
 197 }
 198
 199 asmlinkage long parisc_fadvise64_64(int fd,
 200                         unsigned int high_off, unsigned int low_off,
 201                         unsigned int high_len, unsigned int low_len, int advice)
 202 {
 203         return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
 204                         (loff_t)high_len << 32 | low_len, advice);
 205 }
 206
 207 asmlinkage long parisc_sync_file_range(int fd,
 208                         u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
 209                         unsigned int flags)
 210 {
 211         return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
 212                         (loff_t)hi_nbytes << 32 | lo_nbytes, flags);
 213 }
 214
 215 asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag)
 216 {
 217         return -ENOMEM;
 218 }
 219
 220 asmlinkage int sys_free_hugepages(unsigned long addr)
 221 {
 222         return -EINVAL;
 223 }
 224
 225 long parisc_personality(unsigned long personality)
 226 {
 227         long err;
 228
 229         if (personality(current->personality) == PER_LINUX32
 230             && personality(personality) == PER_LINUX)
 231                 personality = (personality & ~PER_MASK) | PER_LINUX32;
 232
 233         err = sys_personality(personality);
 234         if (personality(err) == PER_LINUX32)
 235                 err = (err & ~PER_MASK) | PER_LINUX;
 236
 237         return err;
 238 }