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 } 233