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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
H. Peter Anvin1965aae2008-10-22 22:26:29 -07002#ifndef _ASM_X86_COMPAT_H
3#define _ASM_X86_COMPAT_H
Linus Torvalds1da177e2005-04-16 15:20:36 -07004
5/*
6 * Architecture specific compatibility types
7 */
8#include <linux/types.h>
9#include <linux/sched.h>
Andy Lutomirskid375cf12017-11-02 00:59:16 -070010#include <linux/sched/task_stack.h>
H. Peter Anvind1a797f2012-02-19 10:06:34 -080011#include <asm/processor.h>
Roland McGrath95d1b8f2007-10-19 20:35:02 +020012#include <asm/user32.h>
H. Peter Anvinfca460f2012-02-19 07:56:26 -080013#include <asm/unistd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
Christoph Hellwige28cbf22010-03-10 15:21:19 -080015#define COMPAT_USER_HZ 100
16#define COMPAT_UTS_MACHINE "i686\0\0"
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18typedef u32 compat_size_t;
19typedef s32 compat_ssize_t;
20typedef s32 compat_time_t;
21typedef s32 compat_clock_t;
22typedef s32 compat_pid_t;
Stephen Rothwell202e5972005-09-06 15:16:40 -070023typedef u16 __compat_uid_t;
24typedef u16 __compat_gid_t;
25typedef u32 __compat_uid32_t;
26typedef u32 __compat_gid32_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070027typedef u16 compat_mode_t;
28typedef u32 compat_ino_t;
29typedef u16 compat_dev_t;
30typedef s32 compat_off_t;
31typedef s64 compat_loff_t;
32typedef u16 compat_nlink_t;
33typedef u16 compat_ipc_pid_t;
34typedef s32 compat_daddr_t;
35typedef u32 compat_caddr_t;
36typedef __kernel_fsid_t compat_fsid_t;
37typedef s32 compat_timer_t;
38typedef s32 compat_key_t;
39
40typedef s32 compat_int_t;
41typedef s32 compat_long_t;
Arnd Bergmann4b777582007-07-15 23:41:11 -070042typedef s64 __attribute__((aligned(4))) compat_s64;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043typedef u32 compat_uint_t;
44typedef u32 compat_ulong_t;
Dave Hansena4455082016-06-08 10:25:33 -070045typedef u32 compat_u32;
Arnd Bergmann4b777582007-07-15 23:41:11 -070046typedef u64 __attribute__((aligned(4))) compat_u64;
Denys Vlasenko751f4092012-10-04 17:15:31 -070047typedef u32 compat_uptr_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49struct compat_timespec {
50 compat_time_t tv_sec;
51 s32 tv_nsec;
52};
53
54struct compat_timeval {
55 compat_time_t tv_sec;
56 s32 tv_usec;
57};
58
59struct compat_stat {
60 compat_dev_t st_dev;
61 u16 __pad1;
62 compat_ino_t st_ino;
63 compat_mode_t st_mode;
64 compat_nlink_t st_nlink;
Stephen Rothwell202e5972005-09-06 15:16:40 -070065 __compat_uid_t st_uid;
66 __compat_gid_t st_gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 compat_dev_t st_rdev;
68 u16 __pad2;
69 u32 st_size;
70 u32 st_blksize;
71 u32 st_blocks;
72 u32 st_atime;
73 u32 st_atime_nsec;
74 u32 st_mtime;
75 u32 st_mtime_nsec;
76 u32 st_ctime;
77 u32 st_ctime_nsec;
78 u32 __unused4;
79 u32 __unused5;
80};
81
82struct compat_flock {
83 short l_type;
84 short l_whence;
85 compat_off_t l_start;
86 compat_off_t l_len;
87 compat_pid_t l_pid;
88};
89
90#define F_GETLK64 12 /* using 'struct flock64' */
91#define F_SETLK64 13
92#define F_SETLKW64 14
93
94/*
95 * IA32 uses 4 byte alignment for 64 bit quantities,
96 * so we need to pack this structure.
97 */
98struct compat_flock64 {
99 short l_type;
100 short l_whence;
101 compat_loff_t l_start;
102 compat_loff_t l_len;
103 compat_pid_t l_pid;
104} __attribute__((packed));
105
106struct compat_statfs {
107 int f_type;
108 int f_bsize;
109 int f_blocks;
110 int f_bfree;
111 int f_bavail;
112 int f_files;
113 int f_ffree;
114 compat_fsid_t f_fsid;
115 int f_namelen; /* SunOS ignores this field. */
116 int f_frsize;
Eric W. Biederman1448c722011-10-17 13:40:02 -0700117 int f_flags;
118 int f_spare[4];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119};
120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121#define COMPAT_RLIM_INFINITY 0xffffffff
122
123typedef u32 compat_old_sigset_t; /* at least 32 bits */
124
125#define _COMPAT_NSIG 64
126#define _COMPAT_NSIG_BPW 32
127
128typedef u32 compat_sigset_word;
129
130#define COMPAT_OFF_T_MAX 0x7fffffff
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
132struct compat_ipc64_perm {
133 compat_key_t key;
Stephen Rothwell202e5972005-09-06 15:16:40 -0700134 __compat_uid32_t uid;
135 __compat_gid32_t gid;
136 __compat_uid32_t cuid;
137 __compat_gid32_t cgid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 unsigned short mode;
139 unsigned short __pad1;
140 unsigned short seq;
141 unsigned short __pad2;
142 compat_ulong_t unused1;
143 compat_ulong_t unused2;
144};
145
146struct compat_semid64_ds {
147 struct compat_ipc64_perm sem_perm;
148 compat_time_t sem_otime;
149 compat_ulong_t __unused1;
150 compat_time_t sem_ctime;
151 compat_ulong_t __unused2;
152 compat_ulong_t sem_nsems;
153 compat_ulong_t __unused3;
154 compat_ulong_t __unused4;
155};
156
157struct compat_msqid64_ds {
158 struct compat_ipc64_perm msg_perm;
159 compat_time_t msg_stime;
160 compat_ulong_t __unused1;
161 compat_time_t msg_rtime;
162 compat_ulong_t __unused2;
163 compat_time_t msg_ctime;
164 compat_ulong_t __unused3;
165 compat_ulong_t msg_cbytes;
166 compat_ulong_t msg_qnum;
167 compat_ulong_t msg_qbytes;
168 compat_pid_t msg_lspid;
169 compat_pid_t msg_lrpid;
170 compat_ulong_t __unused4;
171 compat_ulong_t __unused5;
172};
173
174struct compat_shmid64_ds {
175 struct compat_ipc64_perm shm_perm;
176 compat_size_t shm_segsz;
177 compat_time_t shm_atime;
178 compat_ulong_t __unused1;
179 compat_time_t shm_dtime;
180 compat_ulong_t __unused2;
181 compat_time_t shm_ctime;
182 compat_ulong_t __unused3;
183 compat_pid_t shm_cpid;
184 compat_pid_t shm_lpid;
185 compat_ulong_t shm_nattch;
186 compat_ulong_t __unused4;
187 compat_ulong_t __unused5;
188};
189
190/*
Roland McGrath95d1b8f2007-10-19 20:35:02 +0200191 * The type of struct elf_prstatus.pr_reg in compatible core dumps.
192 */
H. Peter Anvind1a797f2012-02-19 10:06:34 -0800193typedef struct user_regs_struct compat_elf_gregset_t;
194
Dmitry Safonov90954e72016-09-05 16:33:06 +0300195/* Full regset -- prstatus on x32, otherwise on ia32 */
196#define PRSTATUS_SIZE(S, R) (R != sizeof(S.pr_reg) ? 144 : 296)
197#define SET_PR_FPVALID(S, V, R) \
198 do { *(int *) (((void *) &((S)->pr_reg)) + R) = (V); } \
H. Peter Anvind1a797f2012-02-19 10:06:34 -0800199 while (0)
200
Dmitry Safonov7b2dd362016-11-23 21:13:30 +0300201#ifdef CONFIG_X86_X32_ABI
H. Peter Anvind1a797f2012-02-19 10:06:34 -0800202#define COMPAT_USE_64BIT_TIME \
203 (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
H. Peter Anvind1a797f2012-02-19 10:06:34 -0800204#endif
Roland McGrath95d1b8f2007-10-19 20:35:02 +0200205
206/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 * A pointer passed in from user mode. This should not
208 * be used for syscall parameters, just declare them
209 * as pointers because the syscall entry code will have
Marcin Ĺšlusarz8b3de0d2008-02-03 16:32:51 +0200210 * appropriately converted them already.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213static inline void __user *compat_ptr(compat_uptr_t uptr)
214{
215 return (void __user *)(unsigned long)uptr;
216}
217
218static inline compat_uptr_t ptr_to_compat(void __user *uptr)
219{
220 return (u32)(unsigned long)uptr;
221}
222
H. Peter Anvinc41d68a2010-09-07 16:16:18 -0700223static inline void __user *arch_compat_alloc_user_space(long len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
H. Peter Anvind1a797f2012-02-19 10:06:34 -0800225 compat_uptr_t sp;
226
227 if (test_thread_flag(TIF_IA32)) {
228 sp = task_pt_regs(current)->sp;
229 } else {
230 /* -128 for the x32 ABI redzone */
Denys Vlasenko263042e2015-03-09 19:39:23 +0100231 sp = task_pt_regs(current)->sp - 128;
H. Peter Anvind1a797f2012-02-19 10:06:34 -0800232 }
233
234 return (void __user *)round_down(sp - len, 16);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235}
236
Dmitry Safonovabfb9492016-04-18 16:43:43 +0300237static inline bool in_x32_syscall(void)
H. Peter Anvina628b682012-03-05 13:39:29 -0800238{
H. Peter Anvinfca460f2012-02-19 07:56:26 -0800239#ifdef CONFIG_X86_X32_ABI
240 if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
241 return true;
242#endif
243 return false;
Andi Kleenbf2fcc62006-01-11 22:44:06 +0100244}
245
Andy Lutomirskif9701652016-03-22 14:25:27 -0700246static inline bool in_compat_syscall(void)
H. Peter Anvina628b682012-03-05 13:39:29 -0800247{
Dmitry Safonovabfb9492016-04-18 16:43:43 +0300248 return in_ia32_syscall() || in_x32_syscall();
H. Peter Anvina628b682012-03-05 13:39:29 -0800249}
Andy Lutomirskif9701652016-03-22 14:25:27 -0700250#define in_compat_syscall in_compat_syscall /* override the generic impl */
H. Peter Anvina628b682012-03-05 13:39:29 -0800251
Eric W. Biedermanea64d5a2018-01-15 18:03:33 -0600252struct compat_siginfo;
253int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
254 const siginfo_t *from, bool x32_ABI);
255
H. Peter Anvin1965aae2008-10-22 22:26:29 -0700256#endif /* _ASM_X86_COMPAT_H */