1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_COMPAT_H
3 #define _ASM_X86_COMPAT_H
6 * Architecture specific compatibility types
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>
15 #include <asm-generic/compat.h>
17 #define COMPAT_USER_HZ 100
18 #define COMPAT_UTS_MACHINE "i686\0\0"
20 typedef u16 __compat_uid_t;
21 typedef u16 __compat_gid_t;
22 typedef u32 __compat_uid32_t;
23 typedef u32 __compat_gid32_t;
24 typedef u16 compat_mode_t;
25 typedef u16 compat_dev_t;
26 typedef u16 compat_nlink_t;
27 typedef u16 compat_ipc_pid_t;
28 typedef u32 compat_caddr_t;
29 typedef __kernel_fsid_t compat_fsid_t;
35 compat_mode_t st_mode;
36 compat_nlink_t st_nlink;
37 __compat_uid_t st_uid;
38 __compat_gid_t st_gid;
62 #define F_GETLK64 12 /* using 'struct flock64' */
67 * IA32 uses 4 byte alignment for 64 bit quantities,
68 * so we need to pack this structure.
70 struct compat_flock64 {
73 compat_loff_t l_start;
76 } __attribute__((packed));
78 struct compat_statfs {
87 int f_namelen; /* SunOS ignores this field. */
93 #define COMPAT_RLIM_INFINITY 0xffffffff
95 typedef u32 compat_old_sigset_t; /* at least 32 bits */
97 #define _COMPAT_NSIG 64
98 #define _COMPAT_NSIG_BPW 32
100 typedef u32 compat_sigset_word;
102 #define COMPAT_OFF_T_MAX 0x7fffffff
104 struct compat_ipc64_perm {
106 __compat_uid32_t uid;
107 __compat_gid32_t gid;
108 __compat_uid32_t cuid;
109 __compat_gid32_t cgid;
111 unsigned short __pad1;
113 unsigned short __pad2;
114 compat_ulong_t unused1;
115 compat_ulong_t unused2;
118 struct 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;
129 struct 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;
146 struct 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;
163 * The type of struct elf_prstatus.pr_reg in compatible core dumps.
165 typedef struct user_regs_struct compat_elf_gregset_t;
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); } \
173 #ifdef CONFIG_X86_X32_ABI
174 #define COMPAT_USE_64BIT_TIME \
175 (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
178 static inline void __user *arch_compat_alloc_user_space(long len)
182 if (test_thread_flag(TIF_IA32)) {
183 sp = task_pt_regs(current)->sp;
185 /* -128 for the x32 ABI redzone */
186 sp = task_pt_regs(current)->sp - 128;
189 return (void __user *)round_down(sp - len, 16);
192 static inline bool in_x32_syscall(void)
194 #ifdef CONFIG_X86_X32_ABI
195 if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
201 static inline bool in_32bit_syscall(void)
203 return in_ia32_syscall() || in_x32_syscall();
207 static inline bool in_compat_syscall(void)
209 return in_32bit_syscall();
211 #define in_compat_syscall in_compat_syscall /* override the generic impl */
212 #define compat_need_64bit_alignment_fixup in_ia32_syscall
215 struct compat_siginfo;
217 #ifdef CONFIG_X86_X32_ABI
218 int copy_siginfo_to_user32(struct compat_siginfo __user *to,
219 const kernel_siginfo_t *from);
220 #define copy_siginfo_to_user32 copy_siginfo_to_user32
221 #endif /* CONFIG_X86_X32_ABI */
223 #endif /* _ASM_X86_COMPAT_H */