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