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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_COMPAT_H
3#define _ASM_X86_COMPAT_H
4
5/*
6 * Architecture specific compatibility types
7 */
8#include <linux/types.h>
9#include <linux/sched.h>
10#include <linux/sched/task_stack.h>
11#include <asm/processor.h>
12#include <asm/user32.h>
13#include <asm/unistd.h>
14
15#include <asm-generic/compat.h>
16
17#define COMPAT_USER_HZ 100
18#define COMPAT_UTS_MACHINE "i686\0\0"
19
20typedef u16 __compat_uid_t;
21typedef u16 __compat_gid_t;
22typedef u32 __compat_uid32_t;
23typedef u32 __compat_gid32_t;
24typedef u16 compat_mode_t;
25typedef u16 compat_dev_t;
26typedef u16 compat_nlink_t;
27typedef u16 compat_ipc_pid_t;
28typedef u32 compat_caddr_t;
29typedef __kernel_fsid_t compat_fsid_t;
30
31struct compat_stat {
32 compat_dev_t st_dev;
33 u16 __pad1;
34 compat_ino_t st_ino;
35 compat_mode_t st_mode;
36 compat_nlink_t st_nlink;
37 __compat_uid_t st_uid;
38 __compat_gid_t st_gid;
39 compat_dev_t st_rdev;
40 u16 __pad2;
41 u32 st_size;
42 u32 st_blksize;
43 u32 st_blocks;
44 u32 st_atime;
45 u32 st_atime_nsec;
46 u32 st_mtime;
47 u32 st_mtime_nsec;
48 u32 st_ctime;
49 u32 st_ctime_nsec;
50 u32 __unused4;
51 u32 __unused5;
52};
53
54struct compat_flock {
55 short l_type;
56 short l_whence;
57 compat_off_t l_start;
58 compat_off_t l_len;
59 compat_pid_t l_pid;
60};
61
62#define F_GETLK64 12 /* using 'struct flock64' */
63#define F_SETLK64 13
64#define F_SETLKW64 14
65
66/*
67 * IA32 uses 4 byte alignment for 64 bit quantities,
68 * so we need to pack this structure.
69 */
70struct compat_flock64 {
71 short l_type;
72 short l_whence;
73 compat_loff_t l_start;
74 compat_loff_t l_len;
75 compat_pid_t l_pid;
76} __attribute__((packed));
77
78struct compat_statfs {
79 int f_type;
80 int f_bsize;
81 int f_blocks;
82 int f_bfree;
83 int f_bavail;
84 int f_files;
85 int f_ffree;
86 compat_fsid_t f_fsid;
87 int f_namelen; /* SunOS ignores this field. */
88 int f_frsize;
89 int f_flags;
90 int f_spare[4];
91};
92
93#define COMPAT_RLIM_INFINITY 0xffffffff
94
95typedef u32 compat_old_sigset_t; /* at least 32 bits */
96
97#define _COMPAT_NSIG 64
98#define _COMPAT_NSIG_BPW 32
99
100typedef u32 compat_sigset_word;
101
102#define COMPAT_OFF_T_MAX 0x7fffffff
103
104struct compat_ipc64_perm {
105 compat_key_t key;
106 __compat_uid32_t uid;
107 __compat_gid32_t gid;
108 __compat_uid32_t cuid;
109 __compat_gid32_t cgid;
110 unsigned short mode;
111 unsigned short __pad1;
112 unsigned short seq;
113 unsigned short __pad2;
114 compat_ulong_t unused1;
115 compat_ulong_t unused2;
116};
117
118struct compat_semid64_ds {
119 struct compat_ipc64_perm sem_perm;
120 compat_ulong_t sem_otime;
121 compat_ulong_t sem_otime_high;
122 compat_ulong_t sem_ctime;
123 compat_ulong_t sem_ctime_high;
124 compat_ulong_t sem_nsems;
125 compat_ulong_t __unused3;
126 compat_ulong_t __unused4;
127};
128
129struct compat_msqid64_ds {
130 struct compat_ipc64_perm msg_perm;
131 compat_ulong_t msg_stime;
132 compat_ulong_t msg_stime_high;
133 compat_ulong_t msg_rtime;
134 compat_ulong_t msg_rtime_high;
135 compat_ulong_t msg_ctime;
136 compat_ulong_t msg_ctime_high;
137 compat_ulong_t msg_cbytes;
138 compat_ulong_t msg_qnum;
139 compat_ulong_t msg_qbytes;
140 compat_pid_t msg_lspid;
141 compat_pid_t msg_lrpid;
142 compat_ulong_t __unused4;
143 compat_ulong_t __unused5;
144};
145
146struct compat_shmid64_ds {
147 struct compat_ipc64_perm shm_perm;
148 compat_size_t shm_segsz;
149 compat_ulong_t shm_atime;
150 compat_ulong_t shm_atime_high;
151 compat_ulong_t shm_dtime;
152 compat_ulong_t shm_dtime_high;
153 compat_ulong_t shm_ctime;
154 compat_ulong_t shm_ctime_high;
155 compat_pid_t shm_cpid;
156 compat_pid_t shm_lpid;
157 compat_ulong_t shm_nattch;
158 compat_ulong_t __unused4;
159 compat_ulong_t __unused5;
160};
161
162/*
163 * The type of struct elf_prstatus.pr_reg in compatible core dumps.
164 */
165typedef struct user_regs_struct compat_elf_gregset_t;
166
167/* Full regset -- prstatus on x32, otherwise on ia32 */
168#define PRSTATUS_SIZE(S, R) (R != sizeof(S.pr_reg) ? 144 : 296)
169#define SET_PR_FPVALID(S, V, R) \
170 do { *(int *) (((void *) &((S)->pr_reg)) + R) = (V); } \
171 while (0)
172
173#ifdef CONFIG_X86_X32_ABI
174#define COMPAT_USE_64BIT_TIME \
175 (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
176#endif
177
178static inline void __user *arch_compat_alloc_user_space(long len)
179{
180 compat_uptr_t sp = task_pt_regs(current)->sp;
181
182 /*
183 * -128 for the x32 ABI redzone. For IA32, it is not strictly
184 * necessary, but not harmful.
185 */
186 sp -= 128;
187
188 return (void __user *)round_down(sp - len, 16);
189}
190
191static inline bool in_x32_syscall(void)
192{
193#ifdef CONFIG_X86_X32_ABI
194 if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
195 return true;
196#endif
197 return false;
198}
199
200static inline bool in_32bit_syscall(void)
201{
202 return in_ia32_syscall() || in_x32_syscall();
203}
204
205#ifdef CONFIG_COMPAT
206static inline bool in_compat_syscall(void)
207{
208 return in_32bit_syscall();
209}
210#define in_compat_syscall in_compat_syscall /* override the generic impl */
211#define compat_need_64bit_alignment_fixup in_ia32_syscall
212#endif
213
214struct compat_siginfo;
215
216#ifdef CONFIG_X86_X32_ABI
217int copy_siginfo_to_user32(struct compat_siginfo __user *to,
218 const kernel_siginfo_t *from);
219#define copy_siginfo_to_user32 copy_siginfo_to_user32
220#endif /* CONFIG_X86_X32_ABI */
221
222#endif /* _ASM_X86_COMPAT_H */