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>
23 #include <asm/assembler.h>
24 #include <asm/asm-offsets.h>
27 * System call wrappers for the AArch32 compatibility layer.
29 compat_sys_fork_wrapper:
32 ENDPROC(compat_sys_fork_wrapper)
34 compat_sys_vfork_wrapper:
37 ENDPROC(compat_sys_vfork_wrapper)
39 compat_sys_execve_wrapper:
42 ENDPROC(compat_sys_execve_wrapper)
44 compat_sys_clone_wrapper:
47 ENDPROC(compat_sys_clone_wrapper)
49 compat_sys_sigreturn_wrapper:
51 mov x27, #0 // prevent syscall restart handling (why)
52 b compat_sys_sigreturn
53 ENDPROC(compat_sys_sigreturn_wrapper)
55 compat_sys_rt_sigreturn_wrapper:
57 mov x27, #0 // prevent syscall restart handling (why)
58 b compat_sys_rt_sigreturn
59 ENDPROC(compat_sys_rt_sigreturn_wrapper)
61 compat_sys_sigaltstack_wrapper:
62 ldr x2, [sp, #S_COMPAT_SP]
63 b compat_do_sigaltstack
64 ENDPROC(compat_sys_sigaltstack_wrapper)
66 compat_sys_statfs64_wrapper:
71 ENDPROC(compat_sys_statfs64_wrapper)
73 compat_sys_fstatfs64_wrapper:
77 b compat_sys_fstatfs64
78 ENDPROC(compat_sys_fstatfs64_wrapper)
81 * Wrappers for AArch32 syscalls that either take 64-bit parameters
82 * in registers or that take 32-bit parameters which require sign
85 compat_sys_lseek_wrapper:
88 ENDPROC(compat_sys_lseek_wrapper)
90 compat_sys_pread64_wrapper:
91 orr x3, x4, x5, lsl #32
93 ENDPROC(compat_sys_pread64_wrapper)
95 compat_sys_pwrite64_wrapper:
96 orr x3, x4, x5, lsl #32
98 ENDPROC(compat_sys_pwrite64_wrapper)
100 compat_sys_truncate64_wrapper:
101 orr x1, x2, x3, lsl #32
103 ENDPROC(compat_sys_truncate64_wrapper)
105 compat_sys_ftruncate64_wrapper:
106 orr x1, x2, x3, lsl #32
108 ENDPROC(compat_sys_ftruncate64_wrapper)
110 compat_sys_readahead_wrapper:
111 orr x1, x2, x3, lsl #32
114 ENDPROC(compat_sys_readahead_wrapper)
116 compat_sys_lookup_dcookie:
117 orr x0, x0, x1, lsl #32
121 ENDPROC(compat_sys_lookup_dcookie)
123 compat_sys_fadvise64_64_wrapper:
125 orr x1, x2, x3, lsl #32
126 orr x2, x4, x5, lsl #32
129 ENDPROC(compat_sys_fadvise64_64_wrapper)
131 compat_sys_sync_file_range2_wrapper:
132 orr x2, x2, x3, lsl #32
133 orr x3, x4, x5, lsl #32
134 b sys_sync_file_range2
135 ENDPROC(compat_sys_sync_file_range2_wrapper)
137 compat_sys_fallocate_wrapper:
138 orr x2, x2, x3, lsl #32
139 orr x3, x4, x5, lsl #32
141 ENDPROC(compat_sys_fallocate_wrapper)
143 compat_sys_fanotify_mark_wrapper:
144 orr x2, x2, x3, lsl #32
148 ENDPROC(compat_sys_fanotify_mark_wrapper)
151 #define __SYSCALL(x, y) .quad y // x
154 * The system calls table must be 4KB aligned.
157 ENTRY(compat_sys_call_table)
158 #include <asm/unistd32.h>