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 | /* |
9 | * Needed to avoid conflicting __NR_* macros between uapi/asm/unistd.h and |
10 | * asm/unistd32.h. |
11 | */ |
12 | #define __COMPAT_SYSCALL_NR |
13 | |
14 | #include <linux/compat.h> |
15 | #include <linux/compiler.h> |
16 | #include <linux/syscalls.h> |
17 | |
18 | #include <asm/syscall.h> |
19 | |
20 | asmlinkage long compat_sys_sigreturn(void); |
21 | asmlinkage long compat_sys_rt_sigreturn(void); |
22 | |
23 | COMPAT_SYSCALL_DEFINE3(aarch32_statfs64, const char __user *, pathname, |
24 | compat_size_t, sz, struct compat_statfs64 __user *, buf) |
25 | { |
26 | /* |
27 | * 32-bit ARM applies an OABI compatibility fixup to statfs64 and |
28 | * fstatfs64 regardless of whether OABI is in use, and therefore |
29 | * arbitrary binaries may rely upon it, so we must do the same. |
30 | * For more details, see commit: |
31 | * |
32 | * 713c481519f19df9 ("[ARM] 3108/2: old ABI compat: statfs64 and |
33 | * fstatfs64") |
34 | */ |
35 | if (sz == 88) |
36 | sz = 84; |
37 | |
38 | return kcompat_sys_statfs64(pathname, sz, buf); |
39 | } |
40 | |
41 | COMPAT_SYSCALL_DEFINE3(aarch32_fstatfs64, unsigned int, fd, compat_size_t, sz, |
42 | struct compat_statfs64 __user *, buf) |
43 | { |
44 | /* see aarch32_statfs64 */ |
45 | if (sz == 88) |
46 | sz = 84; |
47 | |
48 | return kcompat_sys_fstatfs64(fd, sz, buf); |
49 | } |
50 | |
51 | /* |
52 | * Note: off_4k is always in units of 4K. If we can't do the |
53 | * requested offset because it is not page-aligned, we return -EINVAL. |
54 | */ |
55 | COMPAT_SYSCALL_DEFINE6(aarch32_mmap2, unsigned long, addr, unsigned long, len, |
56 | unsigned long, prot, unsigned long, flags, |
57 | unsigned long, fd, unsigned long, off_4k) |
58 | { |
59 | if (off_4k & (~PAGE_MASK >> 12)) |
60 | return -EINVAL; |
61 | |
62 | off_4k >>= (PAGE_SHIFT - 12); |
63 | |
64 | return ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff: off_4k); |
65 | } |
66 | |
67 | #ifdef CONFIG_CPU_BIG_ENDIAN |
68 | #define arg_u32p(name) u32, name##_hi, u32, name##_lo |
69 | #else |
70 | #define arg_u32p(name) u32, name##_lo, u32, name##_hi |
71 | #endif |
72 | |
73 | #define arg_u64(name) (((u64)name##_hi << 32) | name##_lo) |
74 | |
75 | COMPAT_SYSCALL_DEFINE6(aarch32_pread64, unsigned int, fd, char __user *, buf, |
76 | size_t, count, u32, __pad, arg_u32p(pos)) |
77 | { |
78 | return ksys_pread64(fd, buf, count, arg_u64(pos)); |
79 | } |
80 | |
81 | COMPAT_SYSCALL_DEFINE6(aarch32_pwrite64, unsigned int, fd, |
82 | const char __user *, buf, size_t, count, u32, __pad, |
83 | arg_u32p(pos)) |
84 | { |
85 | return ksys_pwrite64(fd, buf, count, arg_u64(pos)); |
86 | } |
87 | |
88 | COMPAT_SYSCALL_DEFINE4(aarch32_truncate64, const char __user *, pathname, |
89 | u32, __pad, arg_u32p(length)) |
90 | { |
91 | return ksys_truncate(pathname, arg_u64(length)); |
92 | } |
93 | |
94 | COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64, unsigned int, fd, u32, __pad, |
95 | arg_u32p(length)) |
96 | { |
97 | return ksys_ftruncate(fd, arg_u64(length)); |
98 | } |
99 | |
100 | COMPAT_SYSCALL_DEFINE5(aarch32_readahead, int, fd, u32, __pad, |
101 | arg_u32p(offset), size_t, count) |
102 | { |
103 | return ksys_readahead(fd, arg_u64(offset), count); |
104 | } |
105 | |
106 | COMPAT_SYSCALL_DEFINE6(aarch32_fadvise64_64, int, fd, int, advice, |
107 | arg_u32p(offset), arg_u32p(len)) |
108 | { |
109 | return ksys_fadvise64_64(fd, arg_u64(offset), arg_u64(len), advice); |
110 | } |
111 | |
112 | COMPAT_SYSCALL_DEFINE6(aarch32_sync_file_range2, int, fd, unsigned int, flags, |
113 | arg_u32p(offset), arg_u32p(nbytes)) |
114 | { |
115 | return ksys_sync_file_range(fd, arg_u64(offset), arg_u64(nbytes), |
116 | flags); |
117 | } |
118 | |
119 | COMPAT_SYSCALL_DEFINE6(aarch32_fallocate, int, fd, int, mode, |
120 | arg_u32p(offset), arg_u32p(len)) |
121 | { |
122 | return ksys_fallocate(fd, mode, arg_u64(offset), arg_u64(len)); |
123 | } |
124 | |
125 | #undef __SYSCALL |
126 | #define __SYSCALL(nr, sym) asmlinkage long __arm64_##sym(const struct pt_regs *); |
127 | #include <asm/unistd32.h> |
128 | |
129 | #undef __SYSCALL |
130 | #define __SYSCALL(nr, sym) [nr] = __arm64_##sym, |
131 | |
132 | const syscall_fn_t compat_sys_call_table[__NR_compat_syscalls] = { |
133 | [0 ... __NR_compat_syscalls - 1] = __arm64_sys_ni_syscall, |
134 | #include <asm/unistd32.h> |
135 | }; |
136 | |