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// SPDX-License-Identifier: GPL-2.0
/*
* 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/sched/mm.h>
#include <linux/sched/task_stack.h>
#include <linux/shm.h>
#include <linux/file.h> /* doh, must come after sched.h... */
#include <linux/smp.h>
#include <linux/syscalls.h>
#include <linux/highuid.h>
#include <linux/hugetlb.h>
#include <asm/shmparam.h>
#include <linux/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 align_mask = 0;
struct mm_struct *mm = current->mm;
struct vm_unmapped_area_info info;
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 = TASK_UNMAPPED_BASE;
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 = PAGE_MASK & (SHMLBA - 1);
info.flags = 0;
info.length = len;
info.low_limit = addr;
info.high_limit = TASK_SIZE;
info.align_mask = align_mask;
info.align_offset = 0;
return vm_unmapped_area(&info);
}
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 retval = sys_brk(brk);
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_ia64_pipe (void)
{
struct pt_regs *regs = task_pt_regs(current);
int fd[2];
int retval;
retval = do_pipe_flags(fd, 0);
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;
}
/*
* 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 = ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
if (!IS_ERR_VALUE(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 = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
if (!IS_ERR_VALUE(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)
{
addr = sys_mremap(addr, old_len, new_len, flags, new_addr);
if (!IS_ERR_VALUE(addr))
force_successful_syscall_return();
return addr;
}
asmlinkage long
ia64_clock_getres(const clockid_t which_clock, struct __kernel_timespec __user *tp)
{
/*
* ia64's clock_gettime() syscall is implemented as a vdso call
* fsys_clock_gettime(). Currently it handles only
* CLOCK_REALTIME and CLOCK_MONOTONIC. Both are based on
* 'ar.itc' counter which gets incremented at a constant
* frequency. It's usually 400MHz, ~2.5x times slower than CPU
* clock frequency. Which is almost a 1ns hrtimer, but not quite.
*
* Let's special-case these timers to report correct precision
* based on ITC frequency and not HZ frequency for supported
* clocks.
*/
switch (which_clock) {
case CLOCK_REALTIME:
case CLOCK_MONOTONIC:
s64 tick_ns = DIV_ROUND_UP(NSEC_PER_SEC, local_cpu_data->itc_freq);
struct timespec64 rtn_tp = ns_to_timespec64(tick_ns);
return put_timespec64(&rtn_tp, tp);
}
return sys_clock_getres(which_clock, tp);
}
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