1/* 2 * This file contains various system calls that have different calling 3 * conventions on different platforms. 4 * 5 * Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co 6 * David Mosberger-Tang <davidm@hpl.hp.com> 7 */ 8#include <linux/errno.h> 9#include <linux/fs.h> 10#include <linux/mm.h> 11#include <linux/mman.h> 12#include <linux/sched.h> 13#include <linux/shm.h> 14#include <linux/file.h> /* doh, must come after sched.h... */ 15#include <linux/smp.h> 16#include <linux/syscalls.h> 17#include <linux/highuid.h> 18#include <linux/hugetlb.h> 19 20#include <asm/shmparam.h> 21#include <asm/uaccess.h> 22 23unsigned long 24arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len, 25 unsigned long pgoff, unsigned long flags) 26{ 27 long map_shared = (flags & MAP_SHARED); 28 unsigned long start_addr, align_mask = PAGE_SIZE - 1; 29 struct mm_struct *mm = current->mm; 30 struct vm_area_struct *vma; 31 32 if (len > RGN_MAP_LIMIT) 33 return -ENOMEM; 34 35 /* handle fixed mapping: prevent overlap with huge pages */ 36 if (flags & MAP_FIXED) { 37 if (is_hugepage_only_range(mm, addr, len)) 38 return -EINVAL; 39 return addr; 40 } 41 42#ifdef CONFIG_HUGETLB_PAGE 43 if (REGION_NUMBER(addr) == RGN_HPAGE) 44 addr = 0; 45#endif 46 if (!addr) 47 addr = mm->free_area_cache; 48 49 if (map_shared && (TASK_SIZE > 0xfffffffful)) 50 /* 51 * For 64-bit tasks, align shared segments to 1MB to avoid potential 52 * performance penalty due to virtual aliasing (see ASDM). For 32-bit 53 * tasks, we prefer to avoid exhausting the address space too quickly by 54 * limiting alignment to a single page. 55 */ 56 align_mask = SHMLBA - 1; 57 58 full_search: 59 start_addr = addr = (addr + align_mask) & ~align_mask; 60 61 for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { 62 /* At this point: (!vma || addr < vma->vm_end). */ 63 if (TASK_SIZE - len < addr || RGN_MAP_LIMIT - len < REGION_OFFSET(addr)) { 64 if (start_addr != TASK_UNMAPPED_BASE) { 65 /* Start a new search --- just in case we missed some holes. */ 66 addr = TASK_UNMAPPED_BASE; 67 goto full_search; 68 } 69 return -ENOMEM; 70 } 71 if (!vma || addr + len <= vma->vm_start) { 72 /* Remember the address where we stopped this search: */ 73 mm->free_area_cache = addr + len; 74 return addr; 75 } 76 addr = (vma->vm_end + align_mask) & ~align_mask; 77 } 78} 79 80asmlinkage long 81ia64_getpriority (int which, int who) 82{ 83 long prio; 84 85 prio = sys_getpriority(which, who); 86 if (prio >= 0) { 87 force_successful_syscall_return(); 88 prio = 20 - prio; 89 } 90 return prio; 91} 92 93asmlinkage unsigned long 94sys_getpagesize (void) 95{ 96 return PAGE_SIZE; 97} 98 99asmlinkage unsigned long 100ia64_brk (unsigned long brk) 101{ 102 unsigned long rlim, retval, newbrk, oldbrk; 103 struct mm_struct *mm = current->mm; 104 105 /* 106 * Most of this replicates the code in sys_brk() except for an additional safety 107 * check and the clearing of r8. However, we can't call sys_brk() because we need 108 * to acquire the mmap_sem before we can do the test... 109 */ 110 down_write(&mm->mmap_sem); 111 112 if (brk < mm->end_code) 113 goto out; 114 newbrk = PAGE_ALIGN(brk); 115 oldbrk = PAGE_ALIGN(mm->brk); 116 if (oldbrk == newbrk) 117 goto set_brk; 118 119 /* Always allow shrinking brk. */ 120 if (brk <= mm->brk) { 121 if (!do_munmap(mm, newbrk, oldbrk-newbrk)) 122 goto set_brk; 123 goto out; 124 } 125 126 /* Check against unimplemented/unmapped addresses: */ 127 if ((newbrk - oldbrk) > RGN_MAP_LIMIT || REGION_OFFSET(newbrk) > RGN_MAP_LIMIT) 128 goto out; 129 130 /* Check against rlimit.. */ 131 rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur; 132 if (rlim < RLIM_INFINITY && brk - mm->start_data > rlim) 133 goto out; 134 135 /* Check against existing mmap mappings. */ 136 if (find_vma_intersection(mm, oldbrk, newbrk+PAGE_SIZE)) 137 goto out; 138 139 /* Ok, looks good - let it rip. */ 140 if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk) 141 goto out; 142set_brk: 143 mm->brk = brk; 144out: 145 retval = mm->brk; 146 up_write(&mm->mmap_sem); 147 force_successful_syscall_return(); 148 return retval; 149} 150 151/* 152 * On IA-64, we return the two file descriptors in ret0 and ret1 (r8 153 * and r9) as this is faster than doing a copy_to_user(). 154 */ 155asmlinkage long 156sys_pipe (void) 157{ 158 struct pt_regs *regs = task_pt_regs(current); 159 int fd[2]; 160 int retval; 161 162 retval = do_pipe(fd); 163 if (retval) 164 goto out; 165 retval = fd[0]; 166 regs->r9 = fd[1]; 167 out: 168 return retval; 169} 170 171int ia64_mmap_check(unsigned long addr, unsigned long len, 172 unsigned long flags) 173{ 174 unsigned long roff; 175 176 /* 177 * Don't permit mappings into unmapped space, the virtual page table 178 * of a region, or across a region boundary. Note: RGN_MAP_LIMIT is 179 * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0. 180 */ 181 roff = REGION_OFFSET(addr); 182 if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len))) 183 return -EINVAL; 184 return 0; 185} 186 187static inline unsigned long 188do_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, unsigned long pgoff) 189{ 190 struct file *file = NULL; 191 192 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 193 if (!(flags & MAP_ANONYMOUS)) { 194 file = fget(fd); 195 if (!file) 196 return -EBADF; 197 198 if (!file->f_op || !file->f_op->mmap) { 199 addr = -ENODEV; 200 goto out; 201 } 202 } 203 204 /* Careful about overflows.. */ 205 len = PAGE_ALIGN(len); 206 if (!len || len > TASK_SIZE) { 207 addr = -EINVAL; 208 goto out; 209 } 210 211 down_write(¤t->mm->mmap_sem); 212 addr = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 213 up_write(¤t->mm->mmap_sem); 214 215out: if (file) 216 fput(file); 217 return addr; 218} 219 220/* 221 * mmap2() is like mmap() except that the offset is expressed in units 222 * of PAGE_SIZE (instead of bytes). This allows to mmap2() (pieces 223 * of) files that are larger than the address space of the CPU. 224 */ 225asmlinkage unsigned long 226sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff) 227{ 228 addr = do_mmap2(addr, len, prot, flags, fd, pgoff); 229 if (!IS_ERR((void *) addr)) 230 force_successful_syscall_return(); 231 return addr; 232} 233 234asmlinkage unsigned long 235sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off) 236{ 237 if (offset_in_page(off) != 0) 238 return -EINVAL; 239 240 addr = do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 241 if (!IS_ERR((void *) addr)) 242 force_successful_syscall_return(); 243 return addr; 244} 245 246asmlinkage unsigned long 247ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, 248 unsigned long new_addr) 249{ 250 extern unsigned long do_mremap (unsigned long addr, 251 unsigned long old_len, 252 unsigned long new_len, 253 unsigned long flags, 254 unsigned long new_addr); 255 256 down_write(¤t->mm->mmap_sem); 257 { 258 addr = do_mremap(addr, old_len, new_len, flags, new_addr); 259 } 260 up_write(¤t->mm->mmap_sem); 261 262 if (IS_ERR((void *) addr)) 263 return addr; 264 265 force_successful_syscall_return(); 266 return addr; 267} 268 269#ifndef CONFIG_PCI 270 271asmlinkage long 272sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, 273 void *buf) 274{ 275 return -ENOSYS; 276} 277 278asmlinkage long 279sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, 280 void *buf) 281{ 282 return -ENOSYS; 283} 284 285#endif /* CONFIG_PCI */ 286