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3dd681d9 WD |
1 | /* |
2 | * Based on arch/arm/kernel/sys_arm.c | |
3 | * | |
4 | * Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c | |
5 | * Copyright (C) 1995, 1996 Russell King. | |
6 | * Copyright (C) 2012 ARM Ltd. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
3dd681d9 WD |
21 | #include <linux/compat.h> |
22 | #include <linux/personality.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/syscalls.h> | |
26 | #include <linux/uaccess.h> | |
27 | ||
28 | #include <asm/cacheflush.h> | |
f3d447a9 | 29 | #include <asm/unistd32.h> |
3dd681d9 | 30 | |
3dd681d9 WD |
31 | static inline void |
32 | do_compat_cache_op(unsigned long start, unsigned long end, int flags) | |
33 | { | |
34 | struct mm_struct *mm = current->active_mm; | |
35 | struct vm_area_struct *vma; | |
36 | ||
37 | if (end < start || flags) | |
38 | return; | |
39 | ||
40 | down_read(&mm->mmap_sem); | |
41 | vma = find_vma(mm, start); | |
42 | if (vma && vma->vm_start < end) { | |
43 | if (start < vma->vm_start) | |
44 | start = vma->vm_start; | |
45 | if (end > vma->vm_end) | |
46 | end = vma->vm_end; | |
47 | up_read(&mm->mmap_sem); | |
48 | __flush_cache_user_range(start & PAGE_MASK, PAGE_ALIGN(end)); | |
49 | return; | |
50 | } | |
51 | up_read(&mm->mmap_sem); | |
52 | } | |
53 | ||
54 | /* | |
55 | * Handle all unrecognised system calls. | |
56 | */ | |
57 | long compat_arm_syscall(struct pt_regs *regs) | |
58 | { | |
59 | unsigned int no = regs->regs[7]; | |
60 | ||
61 | switch (no) { | |
62 | /* | |
63 | * Flush a region from virtual address 'r0' to virtual address 'r1' | |
64 | * _exclusive_. There is no alignment requirement on either address; | |
65 | * user space does not need to know the hardware cache layout. | |
66 | * | |
67 | * r2 contains flags. It should ALWAYS be passed as ZERO until it | |
68 | * is defined to be something else. For now we ignore it, but may | |
69 | * the fires of hell burn in your belly if you break this rule. ;) | |
70 | * | |
71 | * (at a later date, we may want to allow this call to not flush | |
72 | * various aspects of the cache. Passing '0' will guarantee that | |
73 | * everything necessary gets flushed to maintain consistency in | |
74 | * the specified region). | |
75 | */ | |
76 | case __ARM_NR_compat_cacheflush: | |
77 | do_compat_cache_op(regs->regs[0], regs->regs[1], regs->regs[2]); | |
78 | return 0; | |
79 | ||
80 | case __ARM_NR_compat_set_tls: | |
81 | current->thread.tp_value = regs->regs[0]; | |
82 | asm ("msr tpidrro_el0, %0" : : "r" (regs->regs[0])); | |
83 | return 0; | |
84 | ||
85 | default: | |
86 | return -ENOSYS; | |
87 | } | |
88 | } |