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 } 238