LXR linux/arch/ia64/kernel/sys

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * This file contains various system calls that have different calling
   4 * conventions on different platforms.
   5 *
   6 * Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co
   7 *      David Mosberger-Tang <davidm@hpl.hp.com>
   8 */
   9#include <linux/errno.h>
  10#include <linux/fs.h>
  11#include <linux/mm.h>
  12#include <linux/mman.h>
  13#include <linux/sched.h>
  14#include <linux/sched/mm.h>
  15#include <linux/sched/task_stack.h>
  16#include <linux/shm.h>
  17#include <linux/file.h>         /* doh, must come after sched.h... */
  18#include <linux/smp.h>
  19#include <linux/syscalls.h>
  20#include <linux/highuid.h>
  21#include <linux/hugetlb.h>
  22
  23#include <asm/shmparam.h>
  24#include <linux/uaccess.h>
  25
  26unsigned long
  27arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len,
  28                        unsigned long pgoff, unsigned long flags)
  29{
  30        long map_shared = (flags & MAP_SHARED);
  31        unsigned long align_mask = 0;
  32        struct mm_struct *mm = current->mm;
  33        struct vm_unmapped_area_info info;
  34
  35        if (len > RGN_MAP_LIMIT)
  36                return -ENOMEM;
  37
  38        /* handle fixed mapping: prevent overlap with huge pages */
  39        if (flags & MAP_FIXED) {
  40                if (is_hugepage_only_range(mm, addr, len))
  41                        return -EINVAL;
  42                return addr;
  43        }
  44
  45#ifdef CONFIG_HUGETLB_PAGE
  46        if (REGION_NUMBER(addr) == RGN_HPAGE)
  47                addr = 0;
  48#endif
  49        if (!addr)
  50                addr = TASK_UNMAPPED_BASE;
  51
  52        if (map_shared && (TASK_SIZE > 0xfffffffful))
  53                /*
  54                 * For 64-bit tasks, align shared segments to 1MB to avoid potential
  55                 * performance penalty due to virtual aliasing (see ASDM).  For 32-bit
  56                 * tasks, we prefer to avoid exhausting the address space too quickly by
  57                 * limiting alignment to a single page.
  58                 */
  59                align_mask = PAGE_MASK & (SHMLBA - 1);
  60
  61        info.flags = 0;
  62        info.length = len;
  63        info.low_limit = addr;
  64        info.high_limit = TASK_SIZE;
  65        info.align_mask = align_mask;
  66        info.align_offset = 0;
  67        return vm_unmapped_area(&info);
  68}
  69
  70asmlinkage long
  71ia64_getpriority (int which, int who)
  72{
  73        long prio;
  74
  75        prio = sys_getpriority(which, who);
  76        if (prio >= 0) {
  77                force_successful_syscall_return();
  78                prio = 20 - prio;
  79        }
  80        return prio;
  81}
  82
  83/* XXX obsolete, but leave it here until the old libc is gone... */
  84asmlinkage unsigned long
  85sys_getpagesize (void)
  86{
  87        return PAGE_SIZE;
  88}
  89
  90asmlinkage unsigned long
  91ia64_brk (unsigned long brk)
  92{
  93        unsigned long retval = sys_brk(brk);
  94        force_successful_syscall_return();
  95        return retval;
  96}
  97
  98/*
  99 * On IA-64, we return the two file descriptors in ret0 and ret1 (r8
 100 * and r9) as this is faster than doing a copy_to_user().
 101 */
 102asmlinkage long
 103sys_ia64_pipe (void)
 104{
 105        struct pt_regs *regs = task_pt_regs(current);
 106        int fd[2];
 107        int retval;
 108
 109        retval = do_pipe_flags(fd, 0);
 110        if (retval)
 111                goto out;
 112        retval = fd[0];
 113        regs->r9 = fd[1];
 114  out:
 115        return retval;
 116}
 117
 118int ia64_mmap_check(unsigned long addr, unsigned long len,
 119                unsigned long flags)
 120{
 121        unsigned long roff;
 122
 123        /*
 124         * Don't permit mappings into unmapped space, the virtual page table
 125         * of a region, or across a region boundary.  Note: RGN_MAP_LIMIT is
 126         * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0.
 127         */
 128        roff = REGION_OFFSET(addr);
 129        if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len)))
 130                return -EINVAL;
 131        return 0;
 132}
 133
 134/*
 135 * mmap2() is like mmap() except that the offset is expressed in units
 136 * of PAGE_SIZE (instead of bytes).  This allows to mmap2() (pieces
 137 * of) files that are larger than the address space of the CPU.
 138 */
 139asmlinkage unsigned long
 140sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
 141{
 142        addr = ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
 143        if (!IS_ERR((void *) addr))
 144                force_successful_syscall_return();
 145        return addr;
 146}
 147
 148asmlinkage unsigned long
 149sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off)
 150{
 151        if (offset_in_page(off) != 0)
 152                return -EINVAL;
 153
 154        addr = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
 155        if (!IS_ERR((void *) addr))
 156                force_successful_syscall_return();
 157        return addr;
 158}
 159
 160asmlinkage unsigned long
 161ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags,
 162             unsigned long new_addr)
 163{
 164        addr = sys_mremap(addr, old_len, new_len, flags, new_addr);
 165        if (!IS_ERR((void *) addr))
 166                force_successful_syscall_return();
 167        return addr;
 168}
 169