2 * Compat system call wrappers
4 * Copyright (C) 2012 ARM Ltd.
5 * Authors: Will Deacon <will.deacon@arm.com>
6 * Catalin Marinas <catalin.marinas@arm.com>
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.
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.
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/>.
21 #include <linux/linkage.h>
22 #include <linux/const.h>
24 #include <asm/assembler.h>
25 #include <asm/asm-offsets.h>
26 #include <asm/errno.h>
30 * System call wrappers for the AArch32 compatibility layer.
33 ENTRY(compat_sys_sigreturn_wrapper)
35 mov x27, #0 // prevent syscall restart handling (why)
36 b compat_sys_sigreturn
37 ENDPROC(compat_sys_sigreturn_wrapper)
39 ENTRY(compat_sys_rt_sigreturn_wrapper)
41 mov x27, #0 // prevent syscall restart handling (why)
42 b compat_sys_rt_sigreturn
43 ENDPROC(compat_sys_rt_sigreturn_wrapper)
45 ENTRY(compat_sys_statfs64_wrapper)
50 ENDPROC(compat_sys_statfs64_wrapper)
52 ENTRY(compat_sys_fstatfs64_wrapper)
56 b compat_sys_fstatfs64
57 ENDPROC(compat_sys_fstatfs64_wrapper)
60 * Note: off_4k (w5) is always in units of 4K. If we can't do the
61 * requested offset because it is not page-aligned, we return -EINVAL.
63 ENTRY(compat_sys_mmap2_wrapper)
65 tst w5, #~PAGE_MASK >> 12
67 lsr w5, w5, #PAGE_SHIFT - 12
72 ENDPROC(compat_sys_mmap2_wrapper)
75 * Wrappers for AArch32 syscalls that either take 64-bit parameters
76 * in registers or that take 32-bit parameters which require sign
79 ENTRY(compat_sys_pread64_wrapper)
82 ENDPROC(compat_sys_pread64_wrapper)
84 ENTRY(compat_sys_pwrite64_wrapper)
87 ENDPROC(compat_sys_pwrite64_wrapper)
89 ENTRY(compat_sys_truncate64_wrapper)
92 ENDPROC(compat_sys_truncate64_wrapper)
94 ENTRY(compat_sys_ftruncate64_wrapper)
97 ENDPROC(compat_sys_ftruncate64_wrapper)
99 ENTRY(compat_sys_readahead_wrapper)
100 regs_to_64 x1, x2, x3
103 ENDPROC(compat_sys_readahead_wrapper)
105 ENTRY(compat_sys_fadvise64_64_wrapper)
107 regs_to_64 x1, x2, x3
108 regs_to_64 x2, x4, x5
111 ENDPROC(compat_sys_fadvise64_64_wrapper)
113 ENTRY(compat_sys_sync_file_range2_wrapper)
114 regs_to_64 x2, x2, x3
115 regs_to_64 x3, x4, x5
116 b sys_sync_file_range2
117 ENDPROC(compat_sys_sync_file_range2_wrapper)
119 ENTRY(compat_sys_fallocate_wrapper)
120 regs_to_64 x2, x2, x3
121 regs_to_64 x3, x4, x5
123 ENDPROC(compat_sys_fallocate_wrapper)