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         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 #define COMPAT_OFF_T_MAX        0x7fffffff
 131
 132 struct compat_ipc64_perm {
 133         compat_key_t key;
 134         __compat_uid32_t uid;
 135         __compat_gid32_t gid;
 136         __compat_uid32_t cuid;
 137         __compat_gid32_t cgid;
 138         unsigned short mode;
 139         unsigned short __pad1;
 140         unsigned short seq;
 141         unsigned short __pad2;
 142         compat_ulong_t unused1;
 143         compat_ulong_t unused2;
 144 };
 145
 146 struct compat_semid64_ds {
 147         struct compat_ipc64_perm sem_perm;
 148         compat_time_t  sem_otime;
 149         compat_ulong_t __unused1;
 150         compat_time_t  sem_ctime;
 151         compat_ulong_t __unused2;
 152         compat_ulong_t sem_nsems;
 153         compat_ulong_t __unused3;
 154         compat_ulong_t __unused4;
 155 };
 156
 157 struct compat_msqid64_ds {
 158         struct compat_ipc64_perm msg_perm;
 159         compat_time_t  msg_stime;
 160         compat_ulong_t __unused1;
 161         compat_time_t  msg_rtime;
 162         compat_ulong_t __unused2;
 163         compat_time_t  msg_ctime;
 164         compat_ulong_t __unused3;
 165         compat_ulong_t msg_cbytes;
 166         compat_ulong_t msg_qnum;
 167         compat_ulong_t msg_qbytes;
 168         compat_pid_t   msg_lspid;
 169         compat_pid_t   msg_lrpid;
 170         compat_ulong_t __unused4;
 171         compat_ulong_t __unused5;
 172 };
 173
 174 struct compat_shmid64_ds {
 175         struct compat_ipc64_perm shm_perm;
 176         compat_size_t  shm_segsz;
 177         compat_time_t  shm_atime;
 178         compat_ulong_t __unused1;
 179         compat_time_t  shm_dtime;
 180         compat_ulong_t __unused2;
 181         compat_time_t  shm_ctime;
 182         compat_ulong_t __unused3;
 183         compat_pid_t   shm_cpid;
 184         compat_pid_t   shm_lpid;
 185         compat_ulong_t shm_nattch;
 186         compat_ulong_t __unused4;
 187         compat_ulong_t __unused5;
 188 };
 189
 190 /*
 191  * The type of struct elf_prstatus.pr_reg in compatible core dumps.
 192  */
 193 typedef struct user_regs_struct compat_elf_gregset_t;
 194
 195 /* Full regset -- prstatus on x32, otherwise on ia32 */
 196 #define PRSTATUS_SIZE(S, R) (R != sizeof(S.pr_reg) ? 144 : 296)
 197 #define SET_PR_FPVALID(S, V, R) \
 198   do { *(int *) (((void *) &((S)->pr_reg)) + R) = (V); } \
 199   while (0)
 200
 201 #ifdef CONFIG_X86_X32_ABI
 202 #define COMPAT_USE_64BIT_TIME \
 203         (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
 204 #endif
 205
 206 /*
 207  * A pointer passed in from user mode. This should not
 208  * be used for syscall parameters, just declare them
 209  * as pointers because the syscall entry code will have
 210  * appropriately converted them already.
 211  */
 212
 213 static inline void __user *compat_ptr(compat_uptr_t uptr)
 214 {
 215         return (void __user *)(unsigned long)uptr;
 216 }
 217
 218 static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 219 {
 220         return (u32)(unsigned long)uptr;
 221 }
 222
 223 static inline void __user *arch_compat_alloc_user_space(long len)
 224 {
 225         compat_uptr_t sp;
 226
 227         if (test_thread_flag(TIF_IA32)) {
 228                 sp = task_pt_regs(current)->sp;
 229         } else {
 230                 /* -128 for the x32 ABI redzone */
 231                 sp = task_pt_regs(current)->sp - 128;
 232         }
 233
 234         return (void __user *)round_down(sp - len, 16);
 235 }
 236
 237 static inline bool in_x32_syscall(void)
 238 {
 239 #ifdef CONFIG_X86_X32_ABI
 240         if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
 241                 return true;
 242 #endif
 243         return false;
 244 }
 245
 246 static inline bool in_compat_syscall(void)
 247 {
 248         return in_ia32_syscall() || in_x32_syscall();
 249 }
 250 #define in_compat_syscall in_compat_syscall     /* override the generic impl */
 251
 252 struct compat_siginfo;
 253 int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
 254                 const siginfo_t *from, bool x32_ABI);
 255
 256 #endif /* _ASM_X86_COMPAT_H */