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 <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         u32             st_dev;
  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         u32             st_rdev;
  67         u32             st_size;
  68         u32             st_blksize;
  69         u32             st_blocks;
  70         u32             st_atime;
  71         u32             st_atime_nsec;
  72         u32             st_mtime;
  73         u32             st_mtime_nsec;
  74         u32             st_ctime;
  75         u32             st_ctime_nsec;
  76         u32             __unused4;
  77         u32             __unused5;
  78 };
  79
  80 struct compat_flock {
  81         short           l_type;
  82         short           l_whence;
  83         compat_off_t    l_start;
  84         compat_off_t    l_len;
  85         compat_pid_t    l_pid;
  86 };
  87
  88 #define F_GETLK64       12      /*  using 'struct flock64' */
  89 #define F_SETLK64       13
  90 #define F_SETLKW64      14
  91
  92 /*
  93  * IA32 uses 4 byte alignment for 64 bit quantities,
  94  * so we need to pack this structure.
  95  */
  96 struct compat_flock64 {
  97         short           l_type;
  98         short           l_whence;
  99         compat_loff_t   l_start;
 100         compat_loff_t   l_len;
 101         compat_pid_t    l_pid;
 102 } __attribute__((packed));
 103
 104 struct compat_statfs {
 105         int             f_type;
 106         int             f_bsize;
 107         int             f_blocks;
 108         int             f_bfree;
 109         int             f_bavail;
 110         int             f_files;
 111         int             f_ffree;
 112         compat_fsid_t   f_fsid;
 113         int             f_namelen;      /* SunOS ignores this field. */
 114         int             f_frsize;
 115         int             f_flags;
 116         int             f_spare[4];
 117 };
 118
 119 #define COMPAT_RLIM_INFINITY            0xffffffff
 120
 121 typedef u32             compat_old_sigset_t;    /* at least 32 bits */
 122
 123 #define _COMPAT_NSIG            64
 124 #define _COMPAT_NSIG_BPW        32
 125
 126 typedef u32               compat_sigset_word;
 127
 128 typedef union compat_sigval {
 129         compat_int_t    sival_int;
 130         compat_uptr_t   sival_ptr;
 131 } compat_sigval_t;
 132
 133 typedef struct compat_siginfo {
 134         int si_signo;
 135         int si_errno;
 136         int si_code;
 137
 138         union {
 139                 int _pad[128/sizeof(int) - 3];
 140
 141                 /* kill() */
 142                 struct {
 143                         unsigned int _pid;      /* sender's pid */
 144                         unsigned int _uid;      /* sender's uid */
 145                 } _kill;
 146
 147                 /* POSIX.1b timers */
 148                 struct {
 149                         compat_timer_t _tid;    /* timer id */
 150                         int _overrun;           /* overrun count */
 151                         compat_sigval_t _sigval;        /* same as below */
 152                         int _sys_private;       /* not to be passed to user */
 153                         int _overrun_incr;      /* amount to add to overrun */
 154                 } _timer;
 155
 156                 /* POSIX.1b signals */
 157                 struct {
 158                         unsigned int _pid;      /* sender's pid */
 159                         unsigned int _uid;      /* sender's uid */
 160                         compat_sigval_t _sigval;
 161                 } _rt;
 162
 163                 /* SIGCHLD */
 164                 struct {
 165                         unsigned int _pid;      /* which child */
 166                         unsigned int _uid;      /* sender's uid */
 167                         int _status;            /* exit code */
 168                         compat_clock_t _utime;
 169                         compat_clock_t _stime;
 170                 } _sigchld;
 171
 172                 /* SIGCHLD (x32 version) */
 173                 struct {
 174                         unsigned int _pid;      /* which child */
 175                         unsigned int _uid;      /* sender's uid */
 176                         int _status;            /* exit code */
 177                         compat_s64 _utime;
 178                         compat_s64 _stime;
 179                 } _sigchld_x32;
 180
 181                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
 182                 struct {
 183                         unsigned int _addr;     /* faulting insn/memory ref. */
 184                         short int _addr_lsb;    /* Valid LSB of the reported address. */
 185                         union {
 186                                 /* used when si_code=SEGV_BNDERR */
 187                                 struct {
 188                                         compat_uptr_t _lower;
 189                                         compat_uptr_t _upper;
 190                                 } _addr_bnd;
 191                                 /* used when si_code=SEGV_PKUERR */
 192                                 compat_u32 _pkey;
 193                         };
 194                 } _sigfault;
 195
 196                 /* SIGPOLL */
 197                 struct {
 198                         int _band;      /* POLL_IN, POLL_OUT, POLL_MSG */
 199                         int _fd;
 200                 } _sigpoll;
 201
 202                 struct {
 203                         unsigned int _call_addr; /* calling insn */
 204                         int _syscall;   /* triggering system call number */
 205                         unsigned int _arch;     /* AUDIT_ARCH_* of syscall */
 206                 } _sigsys;
 207         } _sifields;
 208 } compat_siginfo_t;
 209
 210 #define COMPAT_OFF_T_MAX        0x7fffffff
 211
 212 struct compat_ipc64_perm {
 213         compat_key_t key;
 214         __compat_uid32_t uid;
 215         __compat_gid32_t gid;
 216         __compat_uid32_t cuid;
 217         __compat_gid32_t cgid;
 218         unsigned short mode;
 219         unsigned short __pad1;
 220         unsigned short seq;
 221         unsigned short __pad2;
 222         compat_ulong_t unused1;
 223         compat_ulong_t unused2;
 224 };
 225
 226 struct compat_semid64_ds {
 227         struct compat_ipc64_perm sem_perm;
 228         compat_time_t  sem_otime;
 229         compat_ulong_t __unused1;
 230         compat_time_t  sem_ctime;
 231         compat_ulong_t __unused2;
 232         compat_ulong_t sem_nsems;
 233         compat_ulong_t __unused3;
 234         compat_ulong_t __unused4;
 235 };
 236
 237 struct compat_msqid64_ds {
 238         struct compat_ipc64_perm msg_perm;
 239         compat_time_t  msg_stime;
 240         compat_ulong_t __unused1;
 241         compat_time_t  msg_rtime;
 242         compat_ulong_t __unused2;
 243         compat_time_t  msg_ctime;
 244         compat_ulong_t __unused3;
 245         compat_ulong_t msg_cbytes;
 246         compat_ulong_t msg_qnum;
 247         compat_ulong_t msg_qbytes;
 248         compat_pid_t   msg_lspid;
 249         compat_pid_t   msg_lrpid;
 250         compat_ulong_t __unused4;
 251         compat_ulong_t __unused5;
 252 };
 253
 254 struct compat_shmid64_ds {
 255         struct compat_ipc64_perm shm_perm;
 256         compat_size_t  shm_segsz;
 257         compat_time_t  shm_atime;
 258         compat_ulong_t __unused1;
 259         compat_time_t  shm_dtime;
 260         compat_ulong_t __unused2;
 261         compat_time_t  shm_ctime;
 262         compat_ulong_t __unused3;
 263         compat_pid_t   shm_cpid;
 264         compat_pid_t   shm_lpid;
 265         compat_ulong_t shm_nattch;
 266         compat_ulong_t __unused4;
 267         compat_ulong_t __unused5;
 268 };
 269
 270 /*
 271  * The type of struct elf_prstatus.pr_reg in compatible core dumps.
 272  */
 273 typedef struct user_regs_struct compat_elf_gregset_t;
 274
 275 /* Full regset -- prstatus on x32, otherwise on ia32 */
 276 #define PRSTATUS_SIZE(S, R) (R != sizeof(S.pr_reg) ? 144 : 296)
 277 #define SET_PR_FPVALID(S, V, R) \
 278   do { *(int *) (((void *) &((S)->pr_reg)) + R) = (V); } \
 279   while (0)
 280
 281 #ifdef CONFIG_X86_X32_ABI
 282 #define COMPAT_USE_64BIT_TIME \
 283         (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
 284 #endif
 285
 286 /*
 287  * A pointer passed in from user mode. This should not
 288  * be used for syscall parameters, just declare them
 289  * as pointers because the syscall entry code will have
 290  * appropriately converted them already.
 291  */
 292
 293 static inline void __user *compat_ptr(compat_uptr_t uptr)
 294 {
 295         return (void __user *)(unsigned long)uptr;
 296 }
 297
 298 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 299 {
 300         return (u32)(unsigned long)uptr;
 301 }
 302
 303 static inline void __user *arch_compat_alloc_user_space(long len)
 304 {
 305         compat_uptr_t sp;
 306
 307         if (test_thread_flag(TIF_IA32)) {
 308                 sp = task_pt_regs(current)->sp;
 309         } else {
 310                 /* -128 for the x32 ABI redzone */
 311                 sp = task_pt_regs(current)->sp - 128;
 312         }
 313
 314         return (void __user *)round_down(sp - len, 16);
 315 }
 316
 317 static inline bool in_x32_syscall(void)
 318 {
 319 #ifdef CONFIG_X86_X32_ABI
 320         if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
 321                 return true;
 322 #endif
 323         return false;
 324 }
 325
 326 static inline bool in_compat_syscall(void)
 327 {
 328         return in_ia32_syscall() || in_x32_syscall();
 329 }
 330 #define in_compat_syscall in_compat_syscall     /* override the generic impl */
 331
 332 #endif /* _ASM_X86_COMPAT_H */