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_time_t; 21 typedef s32 compat_clock_t; 22 typedef s32 compat_pid_t; 23 typedef u16 __compat_uid_t; 24 typedef u16 __compat_gid_t; 25 typedef u32 __compat_uid32_t; 26 typedef u32 __compat_gid32_t; 27 typedef u16 compat_mode_t; 28 typedef u32 compat_ino_t; 29 typedef u16 compat_dev_t; 30 typedef s32 compat_off_t; 31 typedef s64 compat_loff_t; 32 typedef u16 compat_nlink_t; 33 typedef u16 compat_ipc_pid_t; 34 typedef s32 compat_daddr_t; 35 typedef u32 compat_caddr_t; 36 typedef __kernel_fsid_t compat_fsid_t; 37 typedef s32 compat_timer_t; 38 typedef s32 compat_key_t; 39 40 typedef s32 compat_int_t; 41 typedef s32 compat_long_t; 42 typedef s64 __attribute__((aligned(4))) compat_s64; 43 typedef u32 compat_uint_t; 44 typedef u32 compat_ulong_t; 45 typedef u32 compat_u32; 46 typedef u64 __attribute__((aligned(4))) compat_u64; 47 typedef u32 compat_uptr_t; 48 49 struct compat_timespec { 50 compat_time_t tv_sec; 51 s32 tv_nsec; 52 }; 53 54 struct compat_timeval { 55 compat_time_t tv_sec; 56 s32 tv_usec; 57 }; 58 59 struct 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; 65 __compat_uid_t st_uid; 66 __compat_gid_t st_gid; 67 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 82 struct 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 */ 98 struct 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)); 105 106 struct 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; 117 int f_flags; 118 int f_spare[4]; 119 }; 120 121 #define COMPAT_RLIM_INFINITY 0xffffffff 122 123 typedef u32 compat_old_sigset_t; /* at least 32 bits */ 124 125 #define _COMPAT_NSIG 64 126 #define _COMPAT_NSIG_BPW 32 127 128 typedef u32 compat_sigset_word; 129 130 typedef union compat_sigval { 131 compat_int_t sival_int; 132 compat_uptr_t sival_ptr; 133 } compat_sigval_t; 134 135 typedef struct compat_siginfo { 136 int si_signo; 137 int si_errno; 138 int si_code; 139 140 union { 141 int _pad[128/sizeof(int) - 3]; 142 143 /* kill() */ 144 struct { 145 unsigned int _pid; /* sender's pid */ 146 unsigned int _uid; /* sender's uid */ 147 } _kill; 148 149 /* POSIX.1b timers */ 150 struct { 151 compat_timer_t _tid; /* timer id */ 152 int _overrun; /* overrun count */ 153 compat_sigval_t _sigval; /* same as below */ 154 int _sys_private; /* not to be passed to user */ 155 int _overrun_incr; /* amount to add to overrun */ 156 } _timer; 157 158 /* POSIX.1b signals */ 159 struct { 160 unsigned int _pid; /* sender's pid */ 161 unsigned int _uid; /* sender's uid */ 162 compat_sigval_t _sigval; 163 } _rt; 164 165 /* SIGCHLD */ 166 struct { 167 unsigned int _pid; /* which child */ 168 unsigned int _uid; /* sender's uid */ 169 int _status; /* exit code */ 170 compat_clock_t _utime; 171 compat_clock_t _stime; 172 } _sigchld; 173 174 /* SIGCHLD (x32 version) */ 175 struct { 176 unsigned int _pid; /* which child */ 177 unsigned int _uid; /* sender's uid */ 178 int _status; /* exit code */ 179 compat_s64 _utime; 180 compat_s64 _stime; 181 } _sigchld_x32; 182 183 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ 184 struct { 185 unsigned int _addr; /* faulting insn/memory ref. */ 186 short int _addr_lsb; /* Valid LSB of the reported address. */ 187 union { 188 /* used when si_code=SEGV_BNDERR */ 189 struct { 190 compat_uptr_t _lower; 191 compat_uptr_t _upper; 192 } _addr_bnd; 193 /* used when si_code=SEGV_PKUERR */ 194 compat_u32 _pkey; 195 }; 196 } _sigfault; 197 198 /* SIGPOLL */ 199 struct { 200 int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ 201 int _fd; 202 } _sigpoll; 203 204 struct { 205 unsigned int _call_addr; /* calling insn */ 206 int _syscall; /* triggering system call number */ 207 unsigned int _arch; /* AUDIT_ARCH_* of syscall */ 208 } _sigsys; 209 } _sifields; 210 } compat_siginfo_t; 211 212 #define COMPAT_OFF_T_MAX 0x7fffffff 213 214 struct compat_ipc64_perm { 215 compat_key_t key; 216 __compat_uid32_t uid; 217 __compat_gid32_t gid; 218 __compat_uid32_t cuid; 219 __compat_gid32_t cgid; 220 unsigned short mode; 221 unsigned short __pad1; 222 unsigned short seq; 223 unsigned short __pad2; 224 compat_ulong_t unused1; 225 compat_ulong_t unused2; 226 }; 227 228 struct compat_semid64_ds { 229 struct compat_ipc64_perm sem_perm; 230 compat_time_t sem_otime; 231 compat_ulong_t __unused1; 232 compat_time_t sem_ctime; 233 compat_ulong_t __unused2; 234 compat_ulong_t sem_nsems; 235 compat_ulong_t __unused3; 236 compat_ulong_t __unused4; 237 }; 238 239 struct compat_msqid64_ds { 240 struct compat_ipc64_perm msg_perm; 241 compat_time_t msg_stime; 242 compat_ulong_t __unused1; 243 compat_time_t msg_rtime; 244 compat_ulong_t __unused2; 245 compat_time_t msg_ctime; 246 compat_ulong_t __unused3; 247 compat_ulong_t msg_cbytes; 248 compat_ulong_t msg_qnum; 249 compat_ulong_t msg_qbytes; 250 compat_pid_t msg_lspid; 251 compat_pid_t msg_lrpid; 252 compat_ulong_t __unused4; 253 compat_ulong_t __unused5; 254 }; 255 256 struct compat_shmid64_ds { 257 struct compat_ipc64_perm shm_perm; 258 compat_size_t shm_segsz; 259 compat_time_t shm_atime; 260 compat_ulong_t __unused1; 261 compat_time_t shm_dtime; 262 compat_ulong_t __unused2; 263 compat_time_t shm_ctime; 264 compat_ulong_t __unused3; 265 compat_pid_t shm_cpid; 266 compat_pid_t shm_lpid; 267 compat_ulong_t shm_nattch; 268 compat_ulong_t __unused4; 269 compat_ulong_t __unused5; 270 }; 271 272 /* 273 * The type of struct elf_prstatus.pr_reg in compatible core dumps. 274 */ 275 typedef struct user_regs_struct compat_elf_gregset_t; 276 277 /* Full regset -- prstatus on x32, otherwise on ia32 */ 278 #define PRSTATUS_SIZE(S, R) (R != sizeof(S.pr_reg) ? 144 : 296) 279 #define SET_PR_FPVALID(S, V, R) \ 280 do { *(int *) (((void *) &((S)->pr_reg)) + R) = (V); } \ 281 while (0) 282 283 #ifdef CONFIG_X86_X32_ABI 284 #define COMPAT_USE_64BIT_TIME \ 285 (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)) 286 #endif 287 288 /* 289 * A pointer passed in from user mode. This should not 290 * be used for syscall parameters, just declare them 291 * as pointers because the syscall entry code will have 292 * appropriately converted them already. 293 */ 294 295 static inline void __user *compat_ptr(compat_uptr_t uptr) 296 { 297 return (void __user *)(unsigned long)uptr; 298 } 299 300 static inline compat_uptr_t ptr_to_compat(void __user *uptr) 301 { 302 return (u32)(unsigned long)uptr; 303 } 304 305 static inline void __user *arch_compat_alloc_user_space(long len) 306 { 307 compat_uptr_t sp; 308 309 if (test_thread_flag(TIF_IA32)) { 310 sp = task_pt_regs(current)->sp; 311 } else { 312 /* -128 for the x32 ABI redzone */ 313 sp = task_pt_regs(current)->sp - 128; 314 } 315 316 return (void __user *)round_down(sp - len, 16); 317 } 318 319 static inline bool in_x32_syscall(void) 320 { 321 #ifdef CONFIG_X86_X32_ABI 322 if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT) 323 return true; 324 #endif 325 return false; 326 } 327 328 static inline bool in_compat_syscall(void) 329 { 330 return in_ia32_syscall() || in_x32_syscall(); 331 } 332 #define in_compat_syscall in_compat_syscall /* override the generic impl */ 333 334 #endif /* _ASM_X86_COMPAT_H */ 335