arch/x86/include/asm/compat.h

   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 <asm/processor.h>
  11 #include <asm/user32.h>
  12 #include <asm/unistd.h>
  13
  14 #define COMPAT_USER_HZ          100
  15 #define COMPAT_UTS_MACHINE      "i686\0\0"
  16
  17 typedef u32             compat_size_t;
  18 typedef s32             compat_ssize_t;
  19 typedef s32             compat_time_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_timespec {
  49         compat_time_t   tv_sec;
  50         s32             tv_nsec;
  51 };
  52
  53 struct compat_timeval {
  54         compat_time_t   tv_sec;
  55         s32             tv_usec;
  56 };
  57
  58 struct compat_stat {
  59         compat_dev_t    st_dev;
  60         u16             __pad1;
  61         compat_ino_t    st_ino;
  62         compat_mode_t   st_mode;
  63         compat_nlink_t  st_nlink;
  64         __compat_uid_t  st_uid;
  65         __compat_gid_t  st_gid;
  66         compat_dev_t    st_rdev;
  67         u16             __pad2;
  68         u32             st_size;
  69         u32             st_blksize;
  70         u32             st_blocks;
  71         u32             st_atime;
  72         u32             st_atime_nsec;
  73         u32             st_mtime;
  74         u32             st_mtime_nsec;
  75         u32             st_ctime;
  76         u32             st_ctime_nsec;
  77         u32             __unused4;
  78         u32             __unused5;
  79 };
  80
  81 struct compat_flock {
  82         short           l_type;
  83         short           l_whence;
  84         compat_off_t    l_start;
  85         compat_off_t    l_len;
  86         compat_pid_t    l_pid;
  87 };
  88
  89 #define F_GETLK64       12      /*  using 'struct flock64' */
  90 #define F_SETLK64       13
  91 #define F_SETLKW64      14
  92
  93 /*
  94  * IA32 uses 4 byte alignment for 64 bit quantities,
  95  * so we need to pack this structure.
  96  */
  97 struct compat_flock64 {
  98         short           l_type;
  99         short           l_whence;
 100         compat_loff_t   l_start;
 101         compat_loff_t   l_len;
 102         compat_pid_t    l_pid;
 103 } __attribute__((packed));
 104
 105 struct compat_statfs {
 106         int             f_type;
 107         int             f_bsize;
 108         int             f_blocks;
 109         int             f_bfree;
 110         int             f_bavail;
 111         int             f_files;
 112         int             f_ffree;
 113         compat_fsid_t   f_fsid;
 114         int             f_namelen;      /* SunOS ignores this field. */
 115         int             f_frsize;
 116         int             f_flags;
 117         int             f_spare[4];
 118 };
 119
 120 #define COMPAT_RLIM_INFINITY            0xffffffff
 121
 122 typedef u32             compat_old_sigset_t;    /* at least 32 bits */
 123
 124 #define _COMPAT_NSIG            64
 125 #define _COMPAT_NSIG_BPW        32
 126
 127 typedef u32               compat_sigset_word;
 128
 129 typedef union compat_sigval {
 130         compat_int_t    sival_int;
 131         compat_uptr_t   sival_ptr;
 132 } compat_sigval_t;
 133
 134 typedef struct compat_siginfo {
 135         int si_signo;
 136         int si_errno;
 137         int si_code;
 138
 139         union {
 140                 int _pad[128/sizeof(int) - 3];
 141
 142                 /* kill() */
 143                 struct {
 144                         unsigned int _pid;      /* sender's pid */
 145                         unsigned int _uid;      /* sender's uid */
 146                 } _kill;
 147
 148                 /* POSIX.1b timers */
 149                 struct {
 150                         compat_timer_t _tid;    /* timer id */
 151                         int _overrun;           /* overrun count */
 152                         compat_sigval_t _sigval;        /* same as below */
 153                         int _sys_private;       /* not to be passed to user */
 154                         int _overrun_incr;      /* amount to add to overrun */
 155                 } _timer;
 156
 157                 /* POSIX.1b signals */
 158                 struct {
 159                         unsigned int _pid;      /* sender's pid */
 160                         unsigned int _uid;      /* sender's uid */
 161                         compat_sigval_t _sigval;
 162                 } _rt;
 163
 164                 /* SIGCHLD */
 165                 struct {
 166                         unsigned int _pid;      /* which child */
 167                         unsigned int _uid;      /* sender's uid */
 168                         int _status;            /* exit code */
 169                         compat_clock_t _utime;
 170                         compat_clock_t _stime;
 171                 } _sigchld;
 172
 173                 /* SIGCHLD (x32 version) */
 174                 struct {
 175                         unsigned int _pid;      /* which child */
 176                         unsigned int _uid;      /* sender's uid */
 177                         int _status;            /* exit code */
 178                         compat_s64 _utime;
 179                         compat_s64 _stime;
 180                 } _sigchld_x32;
 181
 182                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
 183                 struct {
 184                         unsigned int _addr;     /* faulting insn/memory ref. */
 185                         short int _addr_lsb;    /* Valid LSB of the reported address. */
 186                         union {
 187                                 /* used when si_code=SEGV_BNDERR */
 188                                 struct {
 189                                         compat_uptr_t _lower;
 190                                         compat_uptr_t _upper;
 191                                 } _addr_bnd;
 192                                 /* used when si_code=SEGV_PKUERR */
 193                                 compat_u32 _pkey;
 194                         };
 195                 } _sigfault;
 196
 197                 /* SIGPOLL */
 198                 struct {
 199                         int _band;      /* POLL_IN, POLL_OUT, POLL_MSG */
 200                         int _fd;
 201                 } _sigpoll;
 202
 203                 struct {
 204                         unsigned int _call_addr; /* calling insn */
 205                         int _syscall;   /* triggering system call number */
 206                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 207                 } _sigsys;
 208         } _sifields;
 209 } compat_siginfo_t;
 210
 211 #define COMPAT_OFF_T_MAX        0x7fffffff
 212 #define COMPAT_LOFF_T_MAX       0x7fffffffffffffffL
 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 */