[linux.git] / 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 <[email protected]>
 */
#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((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 = ksys_mmap_pgoff(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)
{
	addr = sys_mremap(addr, old_len, new_len, flags, new_addr);
	if (!IS_ERR((void *) addr))
		force_successful_syscall_return();
	return addr;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	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 <[email protected]>
	8	*/
1da177e4 LT	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>
01042607	14	#include <linux/sched/mm.h>
68db0cf1	15	#include <linux/sched/task_stack.h>
1da177e4 LT	16	#include <linux/shm.h>
	17	#include <linux/file.h> /* doh, must come after sched.h... */
	18	#include <linux/smp.h>
1da177e4 LT	19	#include <linux/syscalls.h>
	20	#include <linux/highuid.h>
	21	#include <linux/hugetlb.h>
	22
	23	#include <asm/shmparam.h>
7c0f6ba6	24	#include <linux/uaccess.h>
1da177e4 LT	25
	26	unsigned long
	27	arch_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);
f53f2325	31	unsigned long align_mask = 0;
1da177e4	32	struct mm_struct *mm = current->mm;
f53f2325	33	struct vm_unmapped_area_info info;
1da177e4 LT	34
	35	if (len > RGN_MAP_LIMIT)
	36	return -ENOMEM;
	37
afa37394 BH	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
1da177e4	45	#ifdef CONFIG_HUGETLB_PAGE
0a41e250	46	if (REGION_NUMBER(addr) == RGN_HPAGE)
1da177e4 LT	47	addr = 0;
	48	#endif
	49	if (!addr)
f53f2325	50	addr = TASK_UNMAPPED_BASE;
1da177e4 LT	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	*/
f53f2325	59	align_mask = PAGE_MASK & (SHMLBA - 1);
1da177e4	60
f53f2325 ML	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);
1da177e4 LT	68	}
	69
	70	asmlinkage long
	71	ia64_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... */
	84	asmlinkage unsigned long
	85	sys_getpagesize (void)
	86	{
	87	return PAGE_SIZE;
	88	}
	89
1da177e4 LT	90	asmlinkage unsigned long
	91	ia64_brk (unsigned long brk)
	92	{
bb52d669	93	unsigned long retval = sys_brk(brk);
1da177e4 LT	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	*/
	102	asmlinkage long
1134723e	103	sys_ia64_pipe (void)
1da177e4	104	{
6450578f	105	struct pt_regs *regs = task_pt_regs(current);
1da177e4 LT	106	int fd[2];
	107	int retval;
	108
ed8cae8b	109	retval = do_pipe_flags(fd, 0);
1da177e4 LT	110	if (retval)
	111	goto out;
	112	retval = fd[0];
	113	regs->r9 = fd[1];
	114	out:
	115	return retval;
	116	}
	117
3a459756 KK	118	int 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
1da177e4 LT	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	*/
	139	asmlinkage unsigned long
	140	sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
	141	{
a90f590a	142	addr = ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
1da177e4 LT	143	if (!IS_ERR((void *) addr))
	144	force_successful_syscall_return();
	145	return addr;
	146	}
	147
	148	asmlinkage unsigned long
	149	sys_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
a90f590a	154	addr = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
1da177e4 LT	155	if (!IS_ERR((void *) addr))
	156	force_successful_syscall_return();
	157	return addr;
	158	}
	159
	160	asmlinkage unsigned long
	161	ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags,
	162	unsigned long new_addr)
	163	{
657bec85 AV	164	addr = sys_mremap(addr, old_len, new_len, flags, new_addr);
	165	if (!IS_ERR((void *) addr))
	166	force_successful_syscall_return();
1da177e4 LT	167	return addr;
1da177e4 LT	168	}