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;
30typedef s64 __attribute__((aligned(4))) compat_s64;
31typedef u64 __attribute__((aligned(4))) compat_u64;
32
33struct compat_stat {
34 compat_dev_t st_dev;
35 u16 __pad1;
36 compat_ino_t st_ino;
37 compat_mode_t st_mode;
38 compat_nlink_t st_nlink;
39 __compat_uid_t st_uid;
40 __compat_gid_t st_gid;
41 compat_dev_t st_rdev;
42 u16 __pad2;
43 u32 st_size;
44 u32 st_blksize;
45 u32 st_blocks;
46 u32 st_atime;
47 u32 st_atime_nsec;
48 u32 st_mtime;
49 u32 st_mtime_nsec;
50 u32 st_ctime;
51 u32 st_ctime_nsec;
52 u32 __unused4;
53 u32 __unused5;
54};
55
56struct compat_flock {
57 short l_type;
58 short l_whence;
59 compat_off_t l_start;
60 compat_off_t l_len;
61 compat_pid_t l_pid;
62};
63
64#define F_GETLK64 12 /* using 'struct flock64' */
65#define F_SETLK64 13
66#define F_SETLKW64 14
67
68/*
69 * IA32 uses 4 byte alignment for 64 bit quantities,
70 * so we need to pack this structure.
71 */
72struct compat_flock64 {
73 short l_type;
74 short l_whence;
75 compat_loff_t l_start;
76 compat_loff_t l_len;
77 compat_pid_t l_pid;
78} __attribute__((packed));
79
80struct compat_statfs {
81 int f_type;
82 int f_bsize;
83 int f_blocks;
84 int f_bfree;
85 int f_bavail;
86 int f_files;
87 int f_ffree;
88 compat_fsid_t f_fsid;
89 int f_namelen; /* SunOS ignores this field. */
90 int f_frsize;
91 int f_flags;
92 int f_spare[4];
93};
94
95#define COMPAT_RLIM_INFINITY 0xffffffff
96
97typedef u32 compat_old_sigset_t; /* at least 32 bits */
98
99#define _COMPAT_NSIG 64
100#define _COMPAT_NSIG_BPW 32
101
102typedef u32 compat_sigset_word;
103
104#define COMPAT_OFF_T_MAX 0x7fffffff
105
106struct compat_ipc64_perm {
107 compat_key_t key;
108 __compat_uid32_t uid;
109 __compat_gid32_t gid;
110 __compat_uid32_t cuid;
111 __compat_gid32_t cgid;
112 unsigned short mode;
113 unsigned short __pad1;
114 unsigned short seq;
115 unsigned short __pad2;
116 compat_ulong_t unused1;
117 compat_ulong_t unused2;
118};
119
120struct compat_semid64_ds {
121 struct compat_ipc64_perm sem_perm;
122 compat_ulong_t sem_otime;
123 compat_ulong_t sem_otime_high;
124 compat_ulong_t sem_ctime;
125 compat_ulong_t sem_ctime_high;
126 compat_ulong_t sem_nsems;
127 compat_ulong_t __unused3;
128 compat_ulong_t __unused4;
129};
130
131struct compat_msqid64_ds {
132 struct compat_ipc64_perm msg_perm;
133 compat_ulong_t msg_stime;
134 compat_ulong_t msg_stime_high;
135 compat_ulong_t msg_rtime;
136 compat_ulong_t msg_rtime_high;
137 compat_ulong_t msg_ctime;
138 compat_ulong_t msg_ctime_high;
139 compat_ulong_t msg_cbytes;
140 compat_ulong_t msg_qnum;
141 compat_ulong_t msg_qbytes;
142 compat_pid_t msg_lspid;
143 compat_pid_t msg_lrpid;
144 compat_ulong_t __unused4;
145 compat_ulong_t __unused5;
146};
147
148struct compat_shmid64_ds {
149 struct compat_ipc64_perm shm_perm;
150 compat_size_t shm_segsz;
151 compat_ulong_t shm_atime;
152 compat_ulong_t shm_atime_high;
153 compat_ulong_t shm_dtime;
154 compat_ulong_t shm_dtime_high;
155 compat_ulong_t shm_ctime;
156 compat_ulong_t shm_ctime_high;
157 compat_pid_t shm_cpid;
158 compat_pid_t shm_lpid;
159 compat_ulong_t shm_nattch;
160 compat_ulong_t __unused4;
161 compat_ulong_t __unused5;
162};
163
164/*
165 * The type of struct elf_prstatus.pr_reg in compatible core dumps.
166 */
167typedef struct user_regs_struct compat_elf_gregset_t;
168
169/* Full regset -- prstatus on x32, otherwise on ia32 */
170#define PRSTATUS_SIZE(S, R) (R != sizeof(S.pr_reg) ? 144 : 296)
171#define SET_PR_FPVALID(S, V, R) \
172 do { *(int *) (((void *) &((S)->pr_reg)) + R) = (V); } \
173 while (0)
174
175#ifdef CONFIG_X86_X32_ABI
176#define COMPAT_USE_64BIT_TIME \
177 (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
178#endif
179
180/*
181 * A pointer passed in from user mode. This should not
182 * be used for syscall parameters, just declare them
183 * as pointers because the syscall entry code will have
184 * appropriately converted them already.
185 */
186
187static inline void __user *compat_ptr(compat_uptr_t uptr)
188{
189 return (void __user *)(unsigned long)uptr;
190}
191
192static inline compat_uptr_t ptr_to_compat(void __user *uptr)
193{
194 return (u32)(unsigned long)uptr;
195}
196
197static inline void __user *arch_compat_alloc_user_space(long len)
198{
199 compat_uptr_t sp;
200
201 if (test_thread_flag(TIF_IA32)) {
202 sp = task_pt_regs(current)->sp;
203 } else {
204 /* -128 for the x32 ABI redzone */
205 sp = task_pt_regs(current)->sp - 128;
206 }
207
208 return (void __user *)round_down(sp - len, 16);
209}
210
211static inline bool in_x32_syscall(void)
212{
213#ifdef CONFIG_X86_X32_ABI
214 if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
215 return true;
216#endif
217 return false;
218}
219
220static inline bool in_32bit_syscall(void)
221{
222 return in_ia32_syscall() || in_x32_syscall();
223}
224
225#ifdef CONFIG_COMPAT
226static inline bool in_compat_syscall(void)
227{
228 return in_32bit_syscall();
229}
230#define in_compat_syscall in_compat_syscall /* override the generic impl */
231#endif
232
233struct compat_siginfo;
234int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
235 const kernel_siginfo_t *from, bool x32_ABI);
236
237#endif /* _ASM_X86_COMPAT_H */
238