Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/syscalls.h> |
Kyle McMartin | 75a4958 | 2006-08-27 11:12:13 -0400 | [diff] [blame] | 33 | #include <linux/utsname.h> |
| 34 | #include <linux/personality.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Benjamin Herrenschmidt | 869e510 | 2007-05-06 14:50:09 -0700 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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(¤t->mm->mmap_sem); |
| 128 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); |
| 129 | up_write(¤t->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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Kyle McMartin | 6ca773c | 2006-04-20 04:44:07 +0000 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Kyle McMartin | 75a4958 | 2006-08-27 11:12:13 -0400 | [diff] [blame] | 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 | |
Matthew Wilcox | f64ef29 | 2006-10-04 13:33:53 -0600 | [diff] [blame] | 260 | long parisc_newuname(struct new_utsname __user *name) |
Kyle McMartin | 75a4958 | 2006-08-27 11:12:13 -0400 | [diff] [blame] | 261 | { |
Matthew Wilcox | f64ef29 | 2006-10-04 13:33:53 -0600 | [diff] [blame] | 262 | int err = sys_newuname(name); |
Kyle McMartin | 75a4958 | 2006-08-27 11:12:13 -0400 | [diff] [blame] | 263 | |
Matthew Wilcox | f64ef29 | 2006-10-04 13:33:53 -0600 | [diff] [blame] | 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 |
Kyle McMartin | 75a4958 | 2006-08-27 11:12:13 -0400 | [diff] [blame] | 271 | |
Matthew Wilcox | f64ef29 | 2006-10-04 13:33:53 -0600 | [diff] [blame] | 272 | return err; |
Kyle McMartin | 75a4958 | 2006-08-27 11:12:13 -0400 | [diff] [blame] | 273 | } |