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
COMPAT_SYSCALL_DEFINE3(aarch32_statfs64,const char __user *,pathname,compat_size_t,sz,struct compat_statfs64 __user *,buf)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
COMPAT_SYSCALL_DEFINE3(aarch32_fstatfs64,unsigned int,fd,compat_size_t,sz,struct compat_statfs64 __user *,buf)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 */
COMPAT_SYSCALL_DEFINE6(aarch32_mmap2,unsigned long,addr,unsigned long,len,unsigned long,prot,unsigned long,flags,unsigned long,fd,unsigned long,off_4k)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, 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
COMPAT_SYSCALL_DEFINE6(aarch32_pread64,unsigned int,fd,char __user *,buf,size_t,count,u32,__pad,arg_u32p (pos))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
COMPAT_SYSCALL_DEFINE6(aarch32_pwrite64,unsigned int,fd,const char __user *,buf,size_t,count,u32,__pad,arg_u32p (pos))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
COMPAT_SYSCALL_DEFINE4(aarch32_truncate64,const char __user *,pathname,u32,__pad,arg_u32p (length))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
COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64,unsigned int,fd,u32,__pad,arg_u32p (length))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
COMPAT_SYSCALL_DEFINE5(aarch32_readahead,int,fd,u32,__pad,arg_u32p (offset),size_t,count)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
COMPAT_SYSCALL_DEFINE6(aarch32_fadvise64_64,int,fd,int,advice,arg_u32p (offset),arg_u32p (len))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
COMPAT_SYSCALL_DEFINE6(aarch32_sync_file_range2,int,fd,unsigned int,flags,arg_u32p (offset),arg_u32p (nbytes))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
COMPAT_SYSCALL_DEFINE6(aarch32_fallocate,int,fd,int,mode,arg_u32p (offset),arg_u32p (len))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