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 36static 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 */ 64static int get_offset(struct address_space *mapping) 65{ 66 int offset = (unsigned long) mapping << (PAGE_SHIFT - 8); 67 return offset & 0x3FF000; 68} 69 70static 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 90unsigned 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; 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; 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 113asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 114 unsigned long prot, unsigned long flags, unsigned long fd, 115 unsigned long pgoff) 116{ 117 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 118 we have. */ 119 return sys_mmap_pgoff(addr, len, prot, flags, fd, 120 pgoff >> (PAGE_SHIFT - 12)); 121} 122 123asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 124 unsigned long prot, unsigned long flags, unsigned long fd, 125 unsigned long offset) 126{ 127 if (!(offset & ~PAGE_MASK)) { 128 return sys_mmap_pgoff(addr, len, prot, flags, fd, 129 offset >> PAGE_SHIFT); 130 } else { 131 return -EINVAL; 132 } 133} 134 135/* Fucking broken ABI */ 136 137#ifdef CONFIG_64BIT 138asmlinkage long parisc_truncate64(const char __user * path, 139 unsigned int high, unsigned int low) 140{ 141 return sys_truncate(path, (long)high << 32 | low); 142} 143 144asmlinkage long parisc_ftruncate64(unsigned int fd, 145 unsigned int high, unsigned int low) 146{ 147 return sys_ftruncate(fd, (long)high << 32 | low); 148} 149 150/* stubs for the benefit of the syscall_table since truncate64 and truncate 151 * are identical on LP64 */ 152asmlinkage long sys_truncate64(const char __user * path, unsigned long length) 153{ 154 return sys_truncate(path, length); 155} 156asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) 157{ 158 return sys_ftruncate(fd, length); 159} 160asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) 161{ 162 return sys_fcntl(fd, cmd, arg); 163} 164#else 165 166asmlinkage long parisc_truncate64(const char __user * path, 167 unsigned int high, unsigned int low) 168{ 169 return sys_truncate64(path, (loff_t)high << 32 | low); 170} 171 172asmlinkage long parisc_ftruncate64(unsigned int fd, 173 unsigned int high, unsigned int low) 174{ 175 return sys_ftruncate64(fd, (loff_t)high << 32 | low); 176} 177#endif 178 179asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, 180 unsigned int high, unsigned int low) 181{ 182 return sys_pread64(fd, buf, count, (loff_t)high << 32 | low); 183} 184 185asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, 186 size_t count, unsigned int high, unsigned int low) 187{ 188 return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); 189} 190 191asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, 192 size_t count) 193{ 194 return sys_readahead(fd, (loff_t)high << 32 | low, count); 195} 196 197asmlinkage long parisc_fadvise64_64(int fd, 198 unsigned int high_off, unsigned int low_off, 199 unsigned int high_len, unsigned int low_len, int advice) 200{ 201 return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, 202 (loff_t)high_len << 32 | low_len, advice); 203} 204 205asmlinkage long parisc_sync_file_range(int fd, 206 u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, 207 unsigned int flags) 208{ 209 return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, 210 (loff_t)hi_nbytes << 32 | lo_nbytes, flags); 211} 212 213asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag) 214{ 215 return -ENOMEM; 216} 217 218asmlinkage int sys_free_hugepages(unsigned long addr) 219{ 220 return -EINVAL; 221} 222 223long parisc_personality(unsigned long personality) 224{ 225 long err; 226 227 if (personality(current->personality) == PER_LINUX32 228 && personality == PER_LINUX) 229 personality = PER_LINUX32; 230 231 err = sys_personality(personality); 232 if (err == PER_LINUX32) 233 err = PER_LINUX; 234 235 return err; 236} 237