274 lines
7.5 KiB
C
274 lines
7.5 KiB
C
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/*
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* PARISC specific syscalls
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*
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* Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
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* Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
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* Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <asm/uaccess.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/linkage.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/shm.h>
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#include <linux/syscalls.h>
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#include <linux/utsname.h>
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#include <linux/personality.h>
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static unsigned long get_unshared_area(unsigned long addr, unsigned long len)
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{
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struct vm_area_struct *vma;
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addr = PAGE_ALIGN(addr);
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for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
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/* At this point: (!vma || addr < vma->vm_end). */
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if (TASK_SIZE - len < addr)
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return -ENOMEM;
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if (!vma || addr + len <= vma->vm_start)
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return addr;
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addr = vma->vm_end;
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}
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}
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#define DCACHE_ALIGN(addr) (((addr) + (SHMLBA - 1)) &~ (SHMLBA - 1))
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/*
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* We need to know the offset to use. Old scheme was to look for
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* existing mapping and use the same offset. New scheme is to use the
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* address of the kernel data structure as the seed for the offset.
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* We'll see how that works...
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*
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* The mapping is cacheline aligned, so there's no information in the bottom
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* few bits of the address. We're looking for 10 bits (4MB / 4k), so let's
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* drop the bottom 8 bits and use bits 8-17.
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*/
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static int get_offset(struct address_space *mapping)
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{
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int offset = (unsigned long) mapping << (PAGE_SHIFT - 8);
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return offset & 0x3FF000;
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}
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static unsigned long get_shared_area(struct address_space *mapping,
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unsigned long addr, unsigned long len, unsigned long pgoff)
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{
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struct vm_area_struct *vma;
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int offset = mapping ? get_offset(mapping) : 0;
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addr = DCACHE_ALIGN(addr - offset) + offset;
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for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
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/* At this point: (!vma || addr < vma->vm_end). */
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if (TASK_SIZE - len < addr)
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return -ENOMEM;
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if (!vma || addr + len <= vma->vm_start)
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return addr;
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addr = DCACHE_ALIGN(vma->vm_end - offset) + offset;
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if (addr < vma->vm_end) /* handle wraparound */
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return -ENOMEM;
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}
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}
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unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags)
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{
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if (len > TASK_SIZE)
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return -ENOMEM;
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/* Might want to check for cache aliasing issues for MAP_FIXED case
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* like ARM or MIPS ??? --BenH.
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*/
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if (flags & MAP_FIXED)
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return addr;
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if (!addr)
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addr = TASK_UNMAPPED_BASE;
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if (filp) {
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addr = get_shared_area(filp->f_mapping, addr, len, pgoff);
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} else if(flags & MAP_SHARED) {
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addr = get_shared_area(NULL, addr, len, pgoff);
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} else {
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addr = get_unshared_area(addr, len);
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}
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return addr;
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}
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static unsigned long do_mmap2(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags, unsigned long fd,
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unsigned long pgoff)
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{
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struct file * file = NULL;
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unsigned long error = -EBADF;
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if (!(flags & MAP_ANONYMOUS)) {
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file = fget(fd);
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if (!file)
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goto out;
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}
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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down_write(¤t->mm->mmap_sem);
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error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
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up_write(¤t->mm->mmap_sem);
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if (file != NULL)
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fput(file);
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out:
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return error;
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}
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asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags, unsigned long fd,
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unsigned long pgoff)
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{
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/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
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we have. */
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return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
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}
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asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags, unsigned long fd,
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unsigned long offset)
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{
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if (!(offset & ~PAGE_MASK)) {
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return do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
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} else {
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return -EINVAL;
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}
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}
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/* Fucking broken ABI */
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#ifdef CONFIG_64BIT
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asmlinkage long parisc_truncate64(const char __user * path,
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unsigned int high, unsigned int low)
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{
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return sys_truncate(path, (long)high << 32 | low);
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}
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asmlinkage long parisc_ftruncate64(unsigned int fd,
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unsigned int high, unsigned int low)
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{
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return sys_ftruncate(fd, (long)high << 32 | low);
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}
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/* stubs for the benefit of the syscall_table since truncate64 and truncate
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* are identical on LP64 */
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asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
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{
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return sys_truncate(path, length);
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}
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asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
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{
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return sys_ftruncate(fd, length);
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}
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asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
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{
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return sys_fcntl(fd, cmd, arg);
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}
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#else
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asmlinkage long parisc_truncate64(const char __user * path,
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unsigned int high, unsigned int low)
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{
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return sys_truncate64(path, (loff_t)high << 32 | low);
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}
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asmlinkage long parisc_ftruncate64(unsigned int fd,
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unsigned int high, unsigned int low)
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{
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return sys_ftruncate64(fd, (loff_t)high << 32 | low);
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}
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#endif
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asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
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unsigned int high, unsigned int low)
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{
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return sys_pread64(fd, buf, count, (loff_t)high << 32 | low);
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}
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asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
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size_t count, unsigned int high, unsigned int low)
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{
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return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
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}
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asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
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size_t count)
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{
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return sys_readahead(fd, (loff_t)high << 32 | low, count);
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}
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asmlinkage long parisc_fadvise64_64(int fd,
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unsigned int high_off, unsigned int low_off,
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unsigned int high_len, unsigned int low_len, int advice)
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{
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return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
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(loff_t)high_len << 32 | low_len, advice);
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}
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asmlinkage long parisc_sync_file_range(int fd,
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u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
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unsigned int flags)
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{
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return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
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(loff_t)hi_nbytes << 32 | lo_nbytes, flags);
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}
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asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag)
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{
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return -ENOMEM;
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}
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asmlinkage int sys_free_hugepages(unsigned long addr)
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{
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return -EINVAL;
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}
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long parisc_personality(unsigned long personality)
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{
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long err;
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if (personality(current->personality) == PER_LINUX32
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&& personality == PER_LINUX)
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personality = PER_LINUX32;
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err = sys_personality(personality);
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if (err == PER_LINUX32)
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err = PER_LINUX;
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return err;
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}
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long parisc_newuname(struct new_utsname __user *name)
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{
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int err = sys_newuname(name);
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#ifdef CONFIG_COMPAT
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if (!err && personality(current->personality) == PER_LINUX32) {
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if (__put_user(0, name->machine + 6) ||
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__put_user(0, name->machine + 7))
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err = -EFAULT;
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}
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#endif
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return err;
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}
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