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
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
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. */
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
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