Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1/*
2 * Compat system call wrappers
3 *
4 * Copyright (C) 2012 ARM Ltd.
5 * Authors: Will Deacon <will.deacon@arm.com>
6 * Catalin Marinas <catalin.marinas@arm.com>
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
21#include <linux/linkage.h>
22#include <linux/const.h>
23
24#include <asm/assembler.h>
25#include <asm/asm-offsets.h>
26#include <asm/errno.h>
27#include <asm/page.h>
28
29/*
30 * System call wrappers for the AArch32 compatibility layer.
31 */
32
33ENTRY(compat_sys_sigreturn_wrapper)
34 mov x0, sp
35 b compat_sys_sigreturn
36ENDPROC(compat_sys_sigreturn_wrapper)
37
38ENTRY(compat_sys_rt_sigreturn_wrapper)
39 mov x0, sp
40 b compat_sys_rt_sigreturn
41ENDPROC(compat_sys_rt_sigreturn_wrapper)
42
43ENTRY(compat_sys_statfs64_wrapper)
44 mov w3, #84
45 cmp w1, #88
46 csel w1, w3, w1, eq
47 b compat_sys_statfs64
48ENDPROC(compat_sys_statfs64_wrapper)
49
50ENTRY(compat_sys_fstatfs64_wrapper)
51 mov w3, #84
52 cmp w1, #88
53 csel w1, w3, w1, eq
54 b compat_sys_fstatfs64
55ENDPROC(compat_sys_fstatfs64_wrapper)
56
57/*
58 * Note: off_4k (w5) is always in units of 4K. If we can't do the
59 * requested offset because it is not page-aligned, we return -EINVAL.
60 */
61ENTRY(compat_sys_mmap2_wrapper)
62#if PAGE_SHIFT > 12
63 tst w5, #~PAGE_MASK >> 12
64 b.ne 1f
65 lsr w5, w5, #PAGE_SHIFT - 12
66#endif
67 b sys_mmap_pgoff
681: mov x0, #-EINVAL
69 ret
70ENDPROC(compat_sys_mmap2_wrapper)
71
72/*
73 * Wrappers for AArch32 syscalls that either take 64-bit parameters
74 * in registers or that take 32-bit parameters which require sign
75 * extension.
76 */
77ENTRY(compat_sys_pread64_wrapper)
78 regs_to_64 x3, x4, x5
79 b sys_pread64
80ENDPROC(compat_sys_pread64_wrapper)
81
82ENTRY(compat_sys_pwrite64_wrapper)
83 regs_to_64 x3, x4, x5
84 b sys_pwrite64
85ENDPROC(compat_sys_pwrite64_wrapper)
86
87ENTRY(compat_sys_truncate64_wrapper)
88 regs_to_64 x1, x2, x3
89 b sys_truncate
90ENDPROC(compat_sys_truncate64_wrapper)
91
92ENTRY(compat_sys_ftruncate64_wrapper)
93 regs_to_64 x1, x2, x3
94 b sys_ftruncate
95ENDPROC(compat_sys_ftruncate64_wrapper)
96
97ENTRY(compat_sys_readahead_wrapper)
98 regs_to_64 x1, x2, x3
99 mov w2, w4
100 b sys_readahead
101ENDPROC(compat_sys_readahead_wrapper)
102
103ENTRY(compat_sys_fadvise64_64_wrapper)
104 mov w6, w1
105 regs_to_64 x1, x2, x3
106 regs_to_64 x2, x4, x5
107 mov w3, w6
108 b sys_fadvise64_64
109ENDPROC(compat_sys_fadvise64_64_wrapper)
110
111ENTRY(compat_sys_sync_file_range2_wrapper)
112 regs_to_64 x2, x2, x3
113 regs_to_64 x3, x4, x5
114 b sys_sync_file_range2
115ENDPROC(compat_sys_sync_file_range2_wrapper)
116
117ENTRY(compat_sys_fallocate_wrapper)
118 regs_to_64 x2, x2, x3
119 regs_to_64 x3, x4, x5
120 b sys_fallocate
121ENDPROC(compat_sys_fallocate_wrapper)