Release 4.14 arch/ia64/kernel/sys_ia64.c

// 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);
}

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22.40%
1
11.11%
Michel Lespinasse
38
20.77%
1
11.11%
Benjamin Herrenschmidt
27
14.75%
1
11.11%
Rohit Seth
17
9.29%
1
11.11%
David Mosberger-Tang
14
7.65%
1
11.11%
Peter Chubb
1
0.55%
1
11.11%
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183
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9
100.00%


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;
}

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2
4.55%
1
50.00%
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44
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2
100.00%

/* XXX obsolete, but leave it here until the old libc is gone... */

asmlinkage unsigned long

sys_getpagesize (void)
{
	return PAGE_SIZE;
}

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1
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asmlinkage unsigned long

ia64_brk (unsigned long brk)
{
	unsigned long retval = sys_brk(brk);
	force_successful_syscall_return();
	return retval;
}

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22
84.62%
2
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David Mosberger-Tang
2
7.69%
1
25.00%
Al Viro
2
7.69%
1
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26
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4
100.00%

/*
 * 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;
}

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4
6.25%
1
20.00%
Ulrich Drepper
3
4.69%
1
20.00%
Heiko Carstens
1
1.56%
1
20.00%
Al Viro
1
1.56%
1
20.00%
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64
100.00%
5
100.00%



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;
}

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/*
 * 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 = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
	if (!IS_ERR((void *) addr))
		force_successful_syscall_return();
	return addr;
}

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2
3.23%
1
25.00%
Al Viro
1
1.61%
1
25.00%
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62
100.00%
4
100.00%


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 = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
	if (!IS_ERR((void *) addr))
		force_successful_syscall_return();
	return addr;
}

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5
6.49%
2
33.33%
Al Viro
1
1.30%
1
16.67%
Total
77
100.00%
6
100.00%


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((void *) addr))
		force_successful_syscall_return();
	return addr;
}

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3
100.00%

#ifndef CONFIG_PCI


asmlinkage long

sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
		    void *buf)
{
	return -ENOSYS;
}

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asmlinkage long

sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
		     void *buf)
{
	return -ENOSYS;
}

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#endif /* CONFIG_PCI */
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401
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4
13.33%
David Mosberger-Tang
91
13.02%
6
20.00%
Kirill Korotaev
54
7.73%
1
3.33%
Linus Torvalds
46
6.58%
4
13.33%
Michel Lespinasse
38
5.44%
1
3.33%
Benjamin Herrenschmidt
27
3.86%
1
3.33%
Rohit Seth
17
2.43%
1
3.33%
Al Viro
7
1.00%
4
13.33%
Ingo Molnar
6
0.86%
2
6.67%
Ulrich Drepper
3
0.43%
1
3.33%
Arun Sharma
3
0.43%
1
3.33%
Andrew Morton
3
0.43%
1
3.33%
Heiko Carstens
1
0.14%
1
3.33%
Greg Kroah-Hartman
1
0.14%
1
3.33%
Peter Chubb
1
0.14%
1
3.33%
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30
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Directory: arch/ia64/kernel

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