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 
old_mmap(unsigned long addr,unsigned long len,unsigned long prot,unsigned long flags,int fd,unsigned long off)32 asmlinkage 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 
sys_mmap2(unsigned long addr,unsigned long len,unsigned long prot,unsigned long flags,unsigned long fd,unsigned long pgoff)41 asmlinkage 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.  */
sys_cacheflush(unsigned long addr,unsigned long len,int op)58 asmlinkage 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