1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/arch/sh/kernel/sys_sh.c
4 *
5 * This file contains various random system calls that
6 * have a non-standard calling sequence on the Linux/SuperH
7 * platform.
8 *
9 * Taken from i386 version.
10 */
11#include <linux/errno.h>
12#include <linux/sched.h>
13#include <linux/mm.h>
14#include <linux/smp.h>
15#include <linux/sem.h>
16#include <linux/msg.h>
17#include <linux/shm.h>
18#include <linux/stat.h>
19#include <linux/syscalls.h>
20#include <linux/mman.h>
21#include <linux/file.h>
22#include <linux/utsname.h>
23#include <linux/module.h>
24#include <linux/fs.h>
25#include <linux/ipc.h>
26#include <asm/syscalls.h>
27#include <linux/uaccess.h>
28#include <asm/unistd.h>
29#include <asm/cacheflush.h>
30#include <asm/cachectl.h>
31
32asmlinkage int old_mmap(unsigned long addr, unsigned long len,
33	unsigned long prot, unsigned long flags,
34	int fd, unsigned long off)
35{
36	if (off & ~PAGE_MASK)
37		return -EINVAL;
38	return ksys_mmap_pgoff(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
39}
40
41asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
42	unsigned long prot, unsigned long flags,
43	unsigned long fd, unsigned long pgoff)
44{
45	/*
46	 * The shift for mmap2 is constant, regardless of PAGE_SIZE
47	 * setting.
48	 */
49	if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
50		return -EINVAL;
51
52	pgoff >>= PAGE_SHIFT - 12;
53
54	return ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
55}
56
57/* sys_cacheflush -- flush (part of) the processor cache.  */
58asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, int op)
59{
60	struct vm_area_struct *vma;
61
62	if ((op <= 0) || (op > (CACHEFLUSH_D_PURGE|CACHEFLUSH_I)))
63		return -EINVAL;
64
65	/*
66	 * Verify that the specified address region actually belongs
67	 * to this process.
68	 */
69	if (addr + len < addr)
70		return -EFAULT;
71
72	mmap_read_lock(current->mm);
73	vma = find_vma (current->mm, addr);
74	if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
75		mmap_read_unlock(current->mm);
76		return -EFAULT;
77	}
78
79	switch (op & CACHEFLUSH_D_PURGE) {
80		case CACHEFLUSH_D_INVAL:
81			__flush_invalidate_region((void *)addr, len);
82			break;
83		case CACHEFLUSH_D_WB:
84			__flush_wback_region((void *)addr, len);
85			break;
86		case CACHEFLUSH_D_PURGE:
87			__flush_purge_region((void *)addr, len);
88			break;
89	}
90
91	if (op & CACHEFLUSH_I)
92		flush_icache_range(addr, addr+len);
93
94	mmap_read_unlock(current->mm);
95	return 0;
96}
97