1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * arch/arm64/kernel/sys32.c
4 *
5 * Copyright (C) 2015 ARM Ltd.
6 */
7
8 #include <linux/compat.h>
9 #include <linux/compiler.h>
10 #include <linux/syscalls.h>
11
12 #include <asm/syscall.h>
13 #include <asm/unistd_compat_32.h>
14
15 asmlinkage long compat_sys_sigreturn(void);
16 asmlinkage long compat_sys_rt_sigreturn(void);
17
18 COMPAT_SYSCALL_DEFINE3(aarch32_statfs64, const char __user *, pathname,
19 compat_size_t, sz, struct compat_statfs64 __user *, buf)
20 {
21 /*
22 * 32-bit ARM applies an OABI compatibility fixup to statfs64 and
23 * fstatfs64 regardless of whether OABI is in use, and therefore
24 * arbitrary binaries may rely upon it, so we must do the same.
25 * For more details, see commit:
26 *
27 * 713c481519f19df9 ("[ARM] 3108/2: old ABI compat: statfs64 and
28 * fstatfs64")
29 */
30 if (sz == 88)
31 sz = 84;
32
33 return kcompat_sys_statfs64(pathname, sz, buf);
34 }
35
36 COMPAT_SYSCALL_DEFINE3(aarch32_fstatfs64, unsigned int, fd, compat_size_t, sz,
37 struct compat_statfs64 __user *, buf)
38 {
39 /* see aarch32_statfs64 */
40 if (sz == 88)
41 sz = 84;
42
43 return kcompat_sys_fstatfs64(fd, sz, buf);
44 }
45
46 /*
47 * Note: off_4k is always in units of 4K. If we can't do the
48 * requested offset because it is not page-aligned, we return -EINVAL.
49 */
50 COMPAT_SYSCALL_DEFINE6(aarch32_mmap2, unsigned long, addr, unsigned long, len,
51 unsigned long, prot, unsigned long, flags,
52 unsigned long, fd, unsigned long, off_4k)
53 {
54 if (off_4k & (~PAGE_MASK >> 12))
55 return -EINVAL;
56
57 off_4k >>= (PAGE_SHIFT - 12);
58
59 return ksys_mmap_pgoff(addr, len, prot, flags, fd, off_4k);
60 }
61
62 #ifdef CONFIG_CPU_BIG_ENDIAN
63 #define arg_u32p(name) u32, name##_hi, u32, name##_lo
64 #else
65 #define arg_u32p(name) u32, name##_lo, u32, name##_hi
66 #endif
67
68 #define arg_u64(name) (((u64)name##_hi << 32) | name##_lo)
69
70 COMPAT_SYSCALL_DEFINE6(aarch32_pread64, unsigned int, fd, char __user *, buf,
71 size_t, count, u32, __pad, arg_u32p(pos))
72 {
73 return ksys_pread64(fd, buf, count, arg_u64(pos));
74 }
75
76 COMPAT_SYSCALL_DEFINE6(aarch32_pwrite64, unsigned int, fd,
77 const char __user *, buf, size_t, count, u32, __pad,
78 arg_u32p(pos))
79 {
80 return ksys_pwrite64(fd, buf, count, arg_u64(pos));
81 }
82
83 COMPAT_SYSCALL_DEFINE4(aarch32_truncate64, const char __user *, pathname,
84 u32, __pad, arg_u32p(length))
85 {
86 return ksys_truncate(pathname, arg_u64(length));
87 }
88
89 COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64, unsigned int, fd, u32, __pad,
90 arg_u32p(length))
91 {
92 return ksys_ftruncate(fd, arg_u64(length));
93 }
94
95 COMPAT_SYSCALL_DEFINE5(aarch32_readahead, int, fd, u32, __pad,
96 arg_u32p(offset), size_t, count)
97 {
98 return ksys_readahead(fd, arg_u64(offset), count);
99 }
100
101 COMPAT_SYSCALL_DEFINE6(aarch32_fadvise64_64, int, fd, int, advice,
102 arg_u32p(offset), arg_u32p(len))
103 {
104 return ksys_fadvise64_64(fd, arg_u64(offset), arg_u64(len), advice);
105 }
106
107 COMPAT_SYSCALL_DEFINE6(aarch32_sync_file_range2, int, fd, unsigned int, flags,
108 arg_u32p(offset), arg_u32p(nbytes))
109 {
110 return ksys_sync_file_range(fd, arg_u64(offset), arg_u64(nbytes),
111 flags);
112 }
113
114 COMPAT_SYSCALL_DEFINE6(aarch32_fallocate, int, fd, int, mode,
115 arg_u32p(offset), arg_u32p(len))
116 {
117 return ksys_fallocate(fd, mode, arg_u64(offset), arg_u64(len));
118 }
119
120 #define __SYSCALL_WITH_COMPAT(nr, sym, compat) __SYSCALL(nr, compat)
121
122 #undef __SYSCALL
123 #define __SYSCALL(nr, sym) asmlinkage long __arm64_##sym(const struct pt_regs *);
124 #include <asm/syscall_table_32.h>
125
126 #undef __SYSCALL
127 #define __SYSCALL(nr, sym) [nr] = __arm64_##sym,
128
129 const syscall_fn_t compat_sys_call_table[__NR_compat32_syscalls] = {
130 [0 ... __NR_compat32_syscalls - 1] = __arm64_sys_ni_syscall,
131 #include <asm/syscall_table_32.h>
132 };
133
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