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/smp_lock.h> 33 #include <linux/syscalls.h> 34 35 int sys_pipe(int __user *fildes) 36 { 37 int fd[2]; 38 int error; 39 40 error = do_pipe(fd); 41 if (!error) { 42 if (copy_to_user(fildes, fd, 2*sizeof(int))) 43 error = -EFAULT; 44 } 45 return error; 46 } 47 48 static unsigned long get_unshared_area(unsigned long addr, unsigned long len) 49 { 50 struct vm_area_struct *vma; 51 52 addr = PAGE_ALIGN(addr); 53 54 for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) { 55 /* At this point: (!vma || addr < vma->vm_end). */ 56 if (TASK_SIZE - len < addr) 57 return -ENOMEM; 58 if (!vma || addr + len <= vma->vm_start) 59 return addr; 60 addr = vma->vm_end; 61 } 62 } 63 64 #define DCACHE_ALIGN(addr) (((addr) + (SHMLBA - 1)) &~ (SHMLBA - 1)) 65 66 /* 67 * We need to know the offset to use. Old scheme was to look for 68 * existing mapping and use the same offset. New scheme is to use the 69 * address of the kernel data structure as the seed for the offset. 70 * We'll see how that works... 71 * 72 * The mapping is cacheline aligned, so there's no information in the bottom 73 * few bits of the address. We're looking for 10 bits (4MB / 4k), so let's 74 * drop the bottom 8 bits and use bits 8-17. 75 */ 76 static int get_offset(struct address_space *mapping) 77 { 78 int offset = (unsigned long) mapping << (PAGE_SHIFT - 8); 79 return offset & 0x3FF000; 80 } 81 82 static unsigned long get_shared_area(struct address_space *mapping, 83 unsigned long addr, unsigned long len, unsigned long pgoff) 84 { 85 struct vm_area_struct *vma; 86 int offset = mapping ? get_offset(mapping) : 0; 87 88 addr = DCACHE_ALIGN(addr - offset) + offset; 89 90 for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) { 91 /* At this point: (!vma || addr < vma->vm_end). */ 92 if (TASK_SIZE - len < addr) 93 return -ENOMEM; 94 if (!vma || addr + len <= vma->vm_start) 95 return addr; 96 addr = DCACHE_ALIGN(vma->vm_end - offset) + offset; 97 if (addr < vma->vm_end) /* handle wraparound */ 98 return -ENOMEM; 99 } 100 } 101 102 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 103 unsigned long len, unsigned long pgoff, unsigned long flags) 104 { 105 if (len > TASK_SIZE) 106 return -ENOMEM; 107 if (!addr) 108 addr = TASK_UNMAPPED_BASE; 109 110 if (filp) { 111 addr = get_shared_area(filp->f_mapping, addr, len, pgoff); 112 } else if(flags & MAP_SHARED) { 113 addr = get_shared_area(NULL, addr, len, pgoff); 114 } else { 115 addr = get_unshared_area(addr, len); 116 } 117 return addr; 118 } 119 120 static unsigned long do_mmap2(unsigned long addr, unsigned long len, 121 unsigned long prot, unsigned long flags, unsigned long fd, 122 unsigned long pgoff) 123 { 124 struct file * file = NULL; 125 unsigned long error = -EBADF; 126 if (!(flags & MAP_ANONYMOUS)) { 127 file = fget(fd); 128 if (!file) 129 goto out; 130 } 131 132 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 133 134 down_write(¤t->mm->mmap_sem); 135 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 136 up_write(¤t->mm->mmap_sem); 137 138 if (file != NULL) 139 fput(file); 140 out: 141 return error; 142 } 143 144 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 145 unsigned long prot, unsigned long flags, unsigned long fd, 146 unsigned long pgoff) 147 { 148 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 149 we have. */ 150 return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12)); 151 } 152 153 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 154 unsigned long prot, unsigned long flags, unsigned long fd, 155 unsigned long offset) 156 { 157 if (!(offset & ~PAGE_MASK)) { 158 return do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); 159 } else { 160 return -EINVAL; 161 } 162 } 163 164 long sys_shmat_wrapper(int shmid, char __user *shmaddr, int shmflag) 165 { 166 unsigned long raddr; 167 int r; 168 169 r = do_shmat(shmid, shmaddr, shmflag, &raddr); 170 if (r < 0) 171 return r; 172 return raddr; 173 } 174 175 /* Fucking broken ABI */ 176 177 #ifdef CONFIG_64BIT 178 asmlinkage long parisc_truncate64(const char __user * path, 179 unsigned int high, unsigned int low) 180 { 181 return sys_truncate(path, (long)high << 32 | low); 182 } 183 184 asmlinkage long parisc_ftruncate64(unsigned int fd, 185 unsigned int high, unsigned int low) 186 { 187 return sys_ftruncate(fd, (long)high << 32 | low); 188 } 189 190 /* stubs for the benefit of the syscall_table since truncate64 and truncate 191 * are identical on LP64 */ 192 asmlinkage long sys_truncate64(const char __user * path, unsigned long length) 193 { 194 return sys_truncate(path, length); 195 } 196 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) 197 { 198 return sys_ftruncate(fd, length); 199 } 200 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) 201 { 202 return sys_fcntl(fd, cmd, arg); 203 } 204 #else 205 206 asmlinkage long parisc_truncate64(const char __user * path, 207 unsigned int high, unsigned int low) 208 { 209 return sys_truncate64(path, (loff_t)high << 32 | low); 210 } 211 212 asmlinkage long parisc_ftruncate64(unsigned int fd, 213 unsigned int high, unsigned int low) 214 { 215 return sys_ftruncate64(fd, (loff_t)high << 32 | low); 216 } 217 #endif 218 219 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, 220 unsigned int high, unsigned int low) 221 { 222 return sys_pread64(fd, buf, count, (loff_t)high << 32 | low); 223 } 224 225 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, 226 size_t count, unsigned int high, unsigned int low) 227 { 228 return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); 229 } 230 231 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, 232 size_t count) 233 { 234 return sys_readahead(fd, (loff_t)high << 32 | low, count); 235 } 236 237 asmlinkage long parisc_fadvise64_64(int fd, 238 unsigned int high_off, unsigned int low_off, 239 unsigned int high_len, unsigned int low_len, int advice) 240 { 241 return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, 242 (loff_t)high_len << 32 | low_len, advice); 243 } 244 245 asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag) 246 { 247 return -ENOMEM; 248 } 249 250 asmlinkage int sys_free_hugepages(unsigned long addr) 251 { 252 return -EINVAL; 253 } 254