| /* |
| * This file contains various system calls that have different calling |
| * conventions on different platforms. |
| * |
| * Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co |
| * David Mosberger-Tang <davidm@hpl.hp.com> |
| */ |
| #include <linux/errno.h> |
| #include <linux/fs.h> |
| #include <linux/mm.h> |
| #include <linux/mman.h> |
| #include <linux/sched.h> |
| #include <linux/shm.h> |
| #include <linux/file.h> /* doh, must come after sched.h... */ |
| #include <linux/smp.h> |
| #include <linux/smp_lock.h> |
| #include <linux/syscalls.h> |
| #include <linux/highuid.h> |
| #include <linux/hugetlb.h> |
| |
| #include <asm/shmparam.h> |
| #include <asm/uaccess.h> |
| |
| unsigned long |
| arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len, |
| unsigned long pgoff, unsigned long flags) |
| { |
| long map_shared = (flags & MAP_SHARED); |
| unsigned long start_addr, align_mask = PAGE_SIZE - 1; |
| struct mm_struct *mm = current->mm; |
| struct vm_area_struct *vma; |
| |
| if (len > RGN_MAP_LIMIT) |
| return -ENOMEM; |
| |
| /* handle fixed mapping: prevent overlap with huge pages */ |
| if (flags & MAP_FIXED) { |
| if (is_hugepage_only_range(mm, addr, len)) |
| return -EINVAL; |
| return addr; |
| } |
| |
| #ifdef CONFIG_HUGETLB_PAGE |
| if (REGION_NUMBER(addr) == RGN_HPAGE) |
| addr = 0; |
| #endif |
| if (!addr) |
| addr = mm->free_area_cache; |
| |
| if (map_shared && (TASK_SIZE > 0xfffffffful)) |
| /* |
| * For 64-bit tasks, align shared segments to 1MB to avoid potential |
| * performance penalty due to virtual aliasing (see ASDM). For 32-bit |
| * tasks, we prefer to avoid exhausting the address space too quickly by |
| * limiting alignment to a single page. |
| */ |
| align_mask = SHMLBA - 1; |
| |
| full_search: |
| start_addr = addr = (addr + align_mask) & ~align_mask; |
| |
| for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { |
| /* At this point: (!vma || addr < vma->vm_end). */ |
| if (TASK_SIZE - len < addr || RGN_MAP_LIMIT - len < REGION_OFFSET(addr)) { |
| if (start_addr != TASK_UNMAPPED_BASE) { |
| /* Start a new search --- just in case we missed some holes. */ |
| addr = TASK_UNMAPPED_BASE; |
| goto full_search; |
| } |
| return -ENOMEM; |
| } |
| if (!vma || addr + len <= vma->vm_start) { |
| /* Remember the address where we stopped this search: */ |
| mm->free_area_cache = addr + len; |
| return addr; |
| } |
| addr = (vma->vm_end + align_mask) & ~align_mask; |
| } |
| } |
| |
| asmlinkage long |
| ia64_getpriority (int which, int who) |
| { |
| long prio; |
| |
| prio = sys_getpriority(which, who); |
| if (prio >= 0) { |
| force_successful_syscall_return(); |
| prio = 20 - prio; |
| } |
| return prio; |
| } |
| |
| /* XXX obsolete, but leave it here until the old libc is gone... */ |
| asmlinkage unsigned long |
| sys_getpagesize (void) |
| { |
| return PAGE_SIZE; |
| } |
| |
| asmlinkage unsigned long |
| ia64_brk (unsigned long brk) |
| { |
| unsigned long rlim, retval, newbrk, oldbrk; |
| struct mm_struct *mm = current->mm; |
| |
| /* |
| * Most of this replicates the code in sys_brk() except for an additional safety |
| * check and the clearing of r8. However, we can't call sys_brk() because we need |
| * to acquire the mmap_sem before we can do the test... |
| */ |
| down_write(&mm->mmap_sem); |
| |
| if (brk < mm->end_code) |
| goto out; |
| newbrk = PAGE_ALIGN(brk); |
| oldbrk = PAGE_ALIGN(mm->brk); |
| if (oldbrk == newbrk) |
| goto set_brk; |
| |
| /* Always allow shrinking brk. */ |
| if (brk <= mm->brk) { |
| if (!do_munmap(mm, newbrk, oldbrk-newbrk)) |
| goto set_brk; |
| goto out; |
| } |
| |
| /* Check against unimplemented/unmapped addresses: */ |
| if ((newbrk - oldbrk) > RGN_MAP_LIMIT || REGION_OFFSET(newbrk) > RGN_MAP_LIMIT) |
| goto out; |
| |
| /* Check against rlimit.. */ |
| rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur; |
| if (rlim < RLIM_INFINITY && brk - mm->start_data > rlim) |
| goto out; |
| |
| /* Check against existing mmap mappings. */ |
| if (find_vma_intersection(mm, oldbrk, newbrk+PAGE_SIZE)) |
| goto out; |
| |
| /* Ok, looks good - let it rip. */ |
| if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk) |
| goto out; |
| set_brk: |
| mm->brk = brk; |
| out: |
| retval = mm->brk; |
| up_write(&mm->mmap_sem); |
| force_successful_syscall_return(); |
| return retval; |
| } |
| |
| /* |
| * On IA-64, we return the two file descriptors in ret0 and ret1 (r8 |
| * and r9) as this is faster than doing a copy_to_user(). |
| */ |
| asmlinkage long |
| sys_pipe (void) |
| { |
| struct pt_regs *regs = task_pt_regs(current); |
| int fd[2]; |
| int retval; |
| |
| retval = do_pipe(fd); |
| if (retval) |
| goto out; |
| retval = fd[0]; |
| regs->r9 = fd[1]; |
| out: |
| return retval; |
| } |
| |
| int ia64_mmap_check(unsigned long addr, unsigned long len, |
| unsigned long flags) |
| { |
| unsigned long roff; |
| |
| /* |
| * Don't permit mappings into unmapped space, the virtual page table |
| * of a region, or across a region boundary. Note: RGN_MAP_LIMIT is |
| * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0. |
| */ |
| roff = REGION_OFFSET(addr); |
| if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len))) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static inline unsigned long |
| do_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, unsigned long pgoff) |
| { |
| struct file *file = NULL; |
| |
| flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); |
| if (!(flags & MAP_ANONYMOUS)) { |
| file = fget(fd); |
| if (!file) |
| return -EBADF; |
| |
| if (!file->f_op || !file->f_op->mmap) { |
| addr = -ENODEV; |
| goto out; |
| } |
| } |
| |
| /* Careful about overflows.. */ |
| len = PAGE_ALIGN(len); |
| if (!len || len > TASK_SIZE) { |
| addr = -EINVAL; |
| goto out; |
| } |
| |
| down_write(¤t->mm->mmap_sem); |
| addr = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); |
| up_write(¤t->mm->mmap_sem); |
| |
| out: if (file) |
| fput(file); |
| return addr; |
| } |
| |
| /* |
| * mmap2() is like mmap() except that the offset is expressed in units |
| * of PAGE_SIZE (instead of bytes). This allows to mmap2() (pieces |
| * of) files that are larger than the address space of the CPU. |
| */ |
| asmlinkage unsigned long |
| sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff) |
| { |
| addr = do_mmap2(addr, len, prot, flags, fd, pgoff); |
| if (!IS_ERR((void *) addr)) |
| force_successful_syscall_return(); |
| return addr; |
| } |
| |
| asmlinkage unsigned long |
| sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off) |
| { |
| if (offset_in_page(off) != 0) |
| return -EINVAL; |
| |
| addr = do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT); |
| if (!IS_ERR((void *) addr)) |
| force_successful_syscall_return(); |
| return addr; |
| } |
| |
| asmlinkage unsigned long |
| ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, |
| unsigned long new_addr) |
| { |
| extern unsigned long do_mremap (unsigned long addr, |
| unsigned long old_len, |
| unsigned long new_len, |
| unsigned long flags, |
| unsigned long new_addr); |
| |
| down_write(¤t->mm->mmap_sem); |
| { |
| addr = do_mremap(addr, old_len, new_len, flags, new_addr); |
| } |
| up_write(¤t->mm->mmap_sem); |
| |
| if (IS_ERR((void *) addr)) |
| return addr; |
| |
| force_successful_syscall_return(); |
| return addr; |
| } |
| |
| #ifndef CONFIG_PCI |
| |
| asmlinkage long |
| sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, |
| void *buf) |
| { |
| return -ENOSYS; |
| } |
| |
| asmlinkage long |
| sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, |
| void *buf) |
| { |
| return -ENOSYS; |
| } |
| |
| #endif /* CONFIG_PCI */ |