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 #define COMPAT_USER_HZ 100 16 #define COMPAT_UTS_MACHINE "i686\0\0" 17 18 typedef u32 compat_size_t; 19 typedef s32 compat_ssize_t; 20 typedef s32 compat_clock_t; 21 typedef s32 compat_pid_t; 22 typedef u16 __compat_uid_t; 23 typedef u16 __compat_gid_t; 24 typedef u32 __compat_uid32_t; 25 typedef u32 __compat_gid32_t; 26 typedef u16 compat_mode_t; 27 typedef u32 compat_ino_t; 28 typedef u16 compat_dev_t; 29 typedef s32 compat_off_t; 30 typedef s64 compat_loff_t; 31 typedef u16 compat_nlink_t; 32 typedef u16 compat_ipc_pid_t; 33 typedef s32 compat_daddr_t; 34 typedef u32 compat_caddr_t; 35 typedef __kernel_fsid_t compat_fsid_t; 36 typedef s32 compat_timer_t; 37 typedef s32 compat_key_t; 38 39 typedef s32 compat_int_t; 40 typedef s32 compat_long_t; 41 typedef s64 __attribute__((aligned(4))) compat_s64; 42 typedef u32 compat_uint_t; 43 typedef u32 compat_ulong_t; 44 typedef u32 compat_u32; 45 typedef u64 __attribute__((aligned(4))) compat_u64; 46 typedef u32 compat_uptr_t; 47 48 struct compat_stat { 49 compat_dev_t st_dev; 50 u16 __pad1; 51 compat_ino_t st_ino; 52 compat_mode_t st_mode; 53 compat_nlink_t st_nlink; 54 __compat_uid_t st_uid; 55 __compat_gid_t st_gid; 56 compat_dev_t st_rdev; 57 u16 __pad2; 58 u32 st_size; 59 u32 st_blksize; 60 u32 st_blocks; 61 u32 st_atime; 62 u32 st_atime_nsec; 63 u32 st_mtime; 64 u32 st_mtime_nsec; 65 u32 st_ctime; 66 u32 st_ctime_nsec; 67 u32 __unused4; 68 u32 __unused5; 69 }; 70 71 struct compat_flock { 72 short l_type; 73 short l_whence; 74 compat_off_t l_start; 75 compat_off_t l_len; 76 compat_pid_t l_pid; 77 }; 78 79 #define F_GETLK64 12 /* using 'struct flock64' */ 80 #define F_SETLK64 13 81 #define F_SETLKW64 14 82 83 /* 84 * IA32 uses 4 byte alignment for 64 bit quantities, 85 * so we need to pack this structure. 86 */ 87 struct compat_flock64 { 88 short l_type; 89 short l_whence; 90 compat_loff_t l_start; 91 compat_loff_t l_len; 92 compat_pid_t l_pid; 93 } __attribute__((packed)); 94 95 struct compat_statfs { 96 int f_type; 97 int f_bsize; 98 int f_blocks; 99 int f_bfree; 100 int f_bavail; 101 int f_files; 102 int f_ffree; 103 compat_fsid_t f_fsid; 104 int f_namelen; /* SunOS ignores this field. */ 105 int f_frsize; 106 int f_flags; 107 int f_spare[4]; 108 }; 109 110 #define COMPAT_RLIM_INFINITY 0xffffffff 111 112 typedef u32 compat_old_sigset_t; /* at least 32 bits */ 113 114 #define _COMPAT_NSIG 64 115 #define _COMPAT_NSIG_BPW 32 116 117 typedef u32 compat_sigset_word; 118 119 #define COMPAT_OFF_T_MAX 0x7fffffff 120 121 struct compat_ipc64_perm { 122 compat_key_t key; 123 __compat_uid32_t uid; 124 __compat_gid32_t gid; 125 __compat_uid32_t cuid; 126 __compat_gid32_t cgid; 127 unsigned short mode; 128 unsigned short __pad1; 129 unsigned short seq; 130 unsigned short __pad2; 131 compat_ulong_t unused1; 132 compat_ulong_t unused2; 133 }; 134 135 struct compat_semid64_ds { 136 struct compat_ipc64_perm sem_perm; 137 compat_ulong_t sem_otime; 138 compat_ulong_t sem_otime_high; 139 compat_ulong_t sem_ctime; 140 compat_ulong_t sem_ctime_high; 141 compat_ulong_t sem_nsems; 142 compat_ulong_t __unused3; 143 compat_ulong_t __unused4; 144 }; 145 146 struct compat_msqid64_ds { 147 struct compat_ipc64_perm msg_perm; 148 compat_ulong_t msg_stime; 149 compat_ulong_t msg_stime_high; 150 compat_ulong_t msg_rtime; 151 compat_ulong_t msg_rtime_high; 152 compat_ulong_t msg_ctime; 153 compat_ulong_t msg_ctime_high; 154 compat_ulong_t msg_cbytes; 155 compat_ulong_t msg_qnum; 156 compat_ulong_t msg_qbytes; 157 compat_pid_t msg_lspid; 158 compat_pid_t msg_lrpid; 159 compat_ulong_t __unused4; 160 compat_ulong_t __unused5; 161 }; 162 163 struct compat_shmid64_ds { 164 struct compat_ipc64_perm shm_perm; 165 compat_size_t shm_segsz; 166 compat_ulong_t shm_atime; 167 compat_ulong_t shm_atime_high; 168 compat_ulong_t shm_dtime; 169 compat_ulong_t shm_dtime_high; 170 compat_ulong_t shm_ctime; 171 compat_ulong_t shm_ctime_high; 172 compat_pid_t shm_cpid; 173 compat_pid_t shm_lpid; 174 compat_ulong_t shm_nattch; 175 compat_ulong_t __unused4; 176 compat_ulong_t __unused5; 177 }; 178 179 /* 180 * The type of struct elf_prstatus.pr_reg in compatible core dumps. 181 */ 182 typedef struct user_regs_struct compat_elf_gregset_t; 183 184 /* Full regset -- prstatus on x32, otherwise on ia32 */ 185 #define PRSTATUS_SIZE(S, R) (R != sizeof(S.pr_reg) ? 144 : 296) 186 #define SET_PR_FPVALID(S, V, R) \ 187 do { *(int *) (((void *) &((S)->pr_reg)) + R) = (V); } \ 188 while (0) 189 190 #ifdef CONFIG_X86_X32_ABI 191 #define COMPAT_USE_64BIT_TIME \ 192 (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)) 193 #endif 194 195 /* 196 * A pointer passed in from user mode. This should not 197 * be used for syscall parameters, just declare them 198 * as pointers because the syscall entry code will have 199 * appropriately converted them already. 200 */ 201 202 static inline void __user *compat_ptr(compat_uptr_t uptr) 203 { 204 return (void __user *)(unsigned long)uptr; 205 } 206 207 static inline compat_uptr_t ptr_to_compat(void __user *uptr) 208 { 209 return (u32)(unsigned long)uptr; 210 } 211 212 static inline void __user *arch_compat_alloc_user_space(long len) 213 { 214 compat_uptr_t sp; 215 216 if (test_thread_flag(TIF_IA32)) { 217 sp = task_pt_regs(current)->sp; 218 } else { 219 /* -128 for the x32 ABI redzone */ 220 sp = task_pt_regs(current)->sp - 128; 221 } 222 223 return (void __user *)round_down(sp - len, 16); 224 } 225 226 static inline bool in_x32_syscall(void) 227 { 228 #ifdef CONFIG_X86_X32_ABI 229 if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT) 230 return true; 231 #endif 232 return false; 233 } 234 235 static inline bool in_compat_syscall(void) 236 { 237 return in_ia32_syscall() || in_x32_syscall(); 238 } 239 #define in_compat_syscall in_compat_syscall /* override the generic impl */ 240 241 struct compat_siginfo; 242 int __copy_siginfo_to_user32(struct compat_siginfo __user *to, 243 const kernel_siginfo_t *from, bool x32_ABI); 244 245 #endif /* _ASM_X86_COMPAT_H */ 246