1 /*
2 * arch/arm64/kernel/sys32.c
3 *
4 * Copyright (C) 2015 ARM Ltd.
5 *
6 * This program is free software(void); you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http(void);//www.gnu.org/licenses/>.
17 */
18
19 /*
20 * Needed to avoid conflicting __NR_* macros between uapi/asm/unistd.h and
21 * asm/unistd32.h.
22 */
23 #define __COMPAT_SYSCALL_NR
24
25 #include <linux/compat.h>
26 #include <linux/compiler.h>
27 #include <linux/syscalls.h>
28
29 #include <asm/syscall.h>
30
31 asmlinkage long compat_sys_sigreturn(void);
32 asmlinkage long compat_sys_rt_sigreturn(void);
33
COMPAT_SYSCALL_DEFINE3(aarch32_statfs64,const char __user *,pathname,compat_size_t,sz,struct compat_statfs64 __user *,buf)34 COMPAT_SYSCALL_DEFINE3(aarch32_statfs64, const char __user *, pathname,
35 compat_size_t, sz, struct compat_statfs64 __user *, buf)
36 {
37 /*
38 * 32-bit ARM applies an OABI compatibility fixup to statfs64 and
39 * fstatfs64 regardless of whether OABI is in use, and therefore
40 * arbitrary binaries may rely upon it, so we must do the same.
41 * For more details, see commit:
42 *
43 * 713c481519f19df9 ("[ARM] 3108/2: old ABI compat: statfs64 and
44 * fstatfs64")
45 */
46 if (sz == 88)
47 sz = 84;
48
49 return kcompat_sys_statfs64(pathname, sz, buf);
50 }
51
COMPAT_SYSCALL_DEFINE3(aarch32_fstatfs64,unsigned int,fd,compat_size_t,sz,struct compat_statfs64 __user *,buf)52 COMPAT_SYSCALL_DEFINE3(aarch32_fstatfs64, unsigned int, fd, compat_size_t, sz,
53 struct compat_statfs64 __user *, buf)
54 {
55 /* see aarch32_statfs64 */
56 if (sz == 88)
57 sz = 84;
58
59 return kcompat_sys_fstatfs64(fd, sz, buf);
60 }
61
62 /*
63 * Note: off_4k is always in units of 4K. If we can't do the
64 * requested offset because it is not page-aligned, we return -EINVAL.
65 */
COMPAT_SYSCALL_DEFINE6(aarch32_mmap2,unsigned long,addr,unsigned long,len,unsigned long,prot,unsigned long,flags,unsigned long,fd,unsigned long,off_4k)66 COMPAT_SYSCALL_DEFINE6(aarch32_mmap2, unsigned long, addr, unsigned long, len,
67 unsigned long, prot, unsigned long, flags,
68 unsigned long, fd, unsigned long, off_4k)
69 {
70 if (off_4k & (~PAGE_MASK >> 12))
71 return -EINVAL;
72
73 off_4k >>= (PAGE_SHIFT - 12);
74
75 return ksys_mmap_pgoff(addr, len, prot, flags, fd, off_4k);
76 }
77
78 #ifdef CONFIG_CPU_BIG_ENDIAN
79 #define arg_u32p(name) u32, name##_hi, u32, name##_lo
80 #else
81 #define arg_u32p(name) u32, name##_lo, u32, name##_hi
82 #endif
83
84 #define arg_u64(name) (((u64)name##_hi << 32) | name##_lo)
85
COMPAT_SYSCALL_DEFINE6(aarch32_pread64,unsigned int,fd,char __user *,buf,size_t,count,u32,__pad,arg_u32p (pos))86 COMPAT_SYSCALL_DEFINE6(aarch32_pread64, unsigned int, fd, char __user *, buf,
87 size_t, count, u32, __pad, arg_u32p(pos))
88 {
89 return ksys_pread64(fd, buf, count, arg_u64(pos));
90 }
91
COMPAT_SYSCALL_DEFINE6(aarch32_pwrite64,unsigned int,fd,const char __user *,buf,size_t,count,u32,__pad,arg_u32p (pos))92 COMPAT_SYSCALL_DEFINE6(aarch32_pwrite64, unsigned int, fd,
93 const char __user *, buf, size_t, count, u32, __pad,
94 arg_u32p(pos))
95 {
96 return ksys_pwrite64(fd, buf, count, arg_u64(pos));
97 }
98
COMPAT_SYSCALL_DEFINE4(aarch32_truncate64,const char __user *,pathname,u32,__pad,arg_u32p (length))99 COMPAT_SYSCALL_DEFINE4(aarch32_truncate64, const char __user *, pathname,
100 u32, __pad, arg_u32p(length))
101 {
102 return ksys_truncate(pathname, arg_u64(length));
103 }
104
COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64,unsigned int,fd,u32,__pad,arg_u32p (length))105 COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64, unsigned int, fd, u32, __pad,
106 arg_u32p(length))
107 {
108 return ksys_ftruncate(fd, arg_u64(length));
109 }
110
COMPAT_SYSCALL_DEFINE5(aarch32_readahead,int,fd,u32,__pad,arg_u32p (offset),size_t,count)111 COMPAT_SYSCALL_DEFINE5(aarch32_readahead, int, fd, u32, __pad,
112 arg_u32p(offset), size_t, count)
113 {
114 return ksys_readahead(fd, arg_u64(offset), count);
115 }
116
COMPAT_SYSCALL_DEFINE6(aarch32_fadvise64_64,int,fd,int,advice,arg_u32p (offset),arg_u32p (len))117 COMPAT_SYSCALL_DEFINE6(aarch32_fadvise64_64, int, fd, int, advice,
118 arg_u32p(offset), arg_u32p(len))
119 {
120 return ksys_fadvise64_64(fd, arg_u64(offset), arg_u64(len), advice);
121 }
122
COMPAT_SYSCALL_DEFINE6(aarch32_sync_file_range2,int,fd,unsigned int,flags,arg_u32p (offset),arg_u32p (nbytes))123 COMPAT_SYSCALL_DEFINE6(aarch32_sync_file_range2, int, fd, unsigned int, flags,
124 arg_u32p(offset), arg_u32p(nbytes))
125 {
126 return ksys_sync_file_range(fd, arg_u64(offset), arg_u64(nbytes),
127 flags);
128 }
129
COMPAT_SYSCALL_DEFINE6(aarch32_fallocate,int,fd,int,mode,arg_u32p (offset),arg_u32p (len))130 COMPAT_SYSCALL_DEFINE6(aarch32_fallocate, int, fd, int, mode,
131 arg_u32p(offset), arg_u32p(len))
132 {
133 return ksys_fallocate(fd, mode, arg_u64(offset), arg_u64(len));
134 }
135
136 asmlinkage long sys_ni_syscall(const struct pt_regs *);
137 #define __arm64_sys_ni_syscall sys_ni_syscall
138
139 #undef __SYSCALL
140 #define __SYSCALL(nr, sym) asmlinkage long __arm64_##sym(const struct pt_regs *);
141 #include <asm/unistd32.h>
142
143 #undef __SYSCALL
144 #define __SYSCALL(nr, sym) [nr] = (syscall_fn_t)__arm64_##sym,
145
146 const syscall_fn_t compat_sys_call_table[__NR_compat_syscalls] = {
147 [0 ... __NR_compat_syscalls - 1] = (syscall_fn_t)sys_ni_syscall,
148 #include <asm/unistd32.h>
149 };
150
