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 #include <asm-generic/compat.h>
  16
  17 #define COMPAT_USER_HZ          100
  18 #define COMPAT_UTS_MACHINE      "i686\0\0"
  19
  20 typedef u16             __compat_uid_t;
  21 typedef u16             __compat_gid_t;
  22 typedef u32             __compat_uid32_t;
  23 typedef u32             __compat_gid32_t;
  24 typedef u16             compat_mode_t;
  25 typedef u16             compat_dev_t;
  26 typedef u16             compat_nlink_t;
  27 typedef u16             compat_ipc_pid_t;
  28 typedef u32             compat_caddr_t;
  29 typedef __kernel_fsid_t compat_fsid_t;
  30 typedef s64 __attribute__((aligned(4))) compat_s64;
  31 typedef u64 __attribute__((aligned(4))) compat_u64;
  32
  33 struct compat_stat {
  34         compat_dev_t    st_dev;
  35         u16             __pad1;
  36         compat_ino_t    st_ino;
  37         compat_mode_t   st_mode;
  38         compat_nlink_t  st_nlink;
  39         __compat_uid_t  st_uid;
  40         __compat_gid_t  st_gid;
  41         compat_dev_t    st_rdev;
  42         u16             __pad2;
  43         u32             st_size;
  44         u32             st_blksize;
  45         u32             st_blocks;
  46         u32             st_atime;
  47         u32             st_atime_nsec;
  48         u32             st_mtime;
  49         u32             st_mtime_nsec;
  50         u32             st_ctime;
  51         u32             st_ctime_nsec;
  52         u32             __unused4;
  53         u32             __unused5;
  54 };
  55
  56 struct compat_flock {
  57         short           l_type;
  58         short           l_whence;
  59         compat_off_t    l_start;
  60         compat_off_t    l_len;
  61         compat_pid_t    l_pid;
  62 };
  63
  64 #define F_GETLK64       12      /*  using 'struct flock64' */
  65 #define F_SETLK64       13
  66 #define F_SETLKW64      14
  67
  68 /*
  69  * IA32 uses 4 byte alignment for 64 bit quantities,
  70  * so we need to pack this structure.
  71  */
  72 struct compat_flock64 {
  73         short           l_type;
  74         short           l_whence;
  75         compat_loff_t   l_start;
  76         compat_loff_t   l_len;
  77         compat_pid_t    l_pid;
  78 } __attribute__((packed));
  79
  80 struct compat_statfs {
  81         int             f_type;
  82         int             f_bsize;
  83         int             f_blocks;
  84         int             f_bfree;
  85         int             f_bavail;
  86         int             f_files;
  87         int             f_ffree;
  88         compat_fsid_t   f_fsid;
  89         int             f_namelen;      /* SunOS ignores this field. */
  90         int             f_frsize;
  91         int             f_flags;
  92         int             f_spare[4];
  93 };
  94
  95 #define COMPAT_RLIM_INFINITY            0xffffffff
  96
  97 typedef u32             compat_old_sigset_t;    /* at least 32 bits */
  98
  99 #define _COMPAT_NSIG            64
 100 #define _COMPAT_NSIG_BPW        32
 101
 102 typedef u32               compat_sigset_word;
 103
 104 #define COMPAT_OFF_T_MAX        0x7fffffff
 105
 106 struct compat_ipc64_perm {
 107         compat_key_t key;
 108         __compat_uid32_t uid;
 109         __compat_gid32_t gid;
 110         __compat_uid32_t cuid;
 111         __compat_gid32_t cgid;
 112         unsigned short mode;
 113         unsigned short __pad1;
 114         unsigned short seq;
 115         unsigned short __pad2;
 116         compat_ulong_t unused1;
 117         compat_ulong_t unused2;
 118 };
 119
 120 struct compat_semid64_ds {
 121         struct compat_ipc64_perm sem_perm;
 122         compat_ulong_t sem_otime;
 123         compat_ulong_t sem_otime_high;
 124         compat_ulong_t sem_ctime;
 125         compat_ulong_t sem_ctime_high;
 126         compat_ulong_t sem_nsems;
 127         compat_ulong_t __unused3;
 128         compat_ulong_t __unused4;
 129 };
 130
 131 struct compat_msqid64_ds {
 132         struct compat_ipc64_perm msg_perm;
 133         compat_ulong_t msg_stime;
 134         compat_ulong_t msg_stime_high;
 135         compat_ulong_t msg_rtime;
 136         compat_ulong_t msg_rtime_high;
 137         compat_ulong_t msg_ctime;
 138         compat_ulong_t msg_ctime_high;
 139         compat_ulong_t msg_cbytes;
 140         compat_ulong_t msg_qnum;
 141         compat_ulong_t msg_qbytes;
 142         compat_pid_t   msg_lspid;
 143         compat_pid_t   msg_lrpid;
 144         compat_ulong_t __unused4;
 145         compat_ulong_t __unused5;
 146 };
 147
 148 struct compat_shmid64_ds {
 149         struct compat_ipc64_perm shm_perm;
 150         compat_size_t  shm_segsz;
 151         compat_ulong_t shm_atime;
 152         compat_ulong_t shm_atime_high;
 153         compat_ulong_t shm_dtime;
 154         compat_ulong_t shm_dtime_high;
 155         compat_ulong_t shm_ctime;
 156         compat_ulong_t shm_ctime_high;
 157         compat_pid_t   shm_cpid;
 158         compat_pid_t   shm_lpid;
 159         compat_ulong_t shm_nattch;
 160         compat_ulong_t __unused4;
 161         compat_ulong_t __unused5;
 162 };
 163
 164 /*
 165  * The type of struct elf_prstatus.pr_reg in compatible core dumps.
 166  */
 167 typedef struct user_regs_struct compat_elf_gregset_t;
 168
 169 /* Full regset -- prstatus on x32, otherwise on ia32 */
 170 #define PRSTATUS_SIZE(S, R) (R != sizeof(S.pr_reg) ? 144 : 296)
 171 #define SET_PR_FPVALID(S, V, R) \
 172   do { *(int *) (((void *) &((S)->pr_reg)) + R) = (V); } \
 173   while (0)
 174
 175 #ifdef CONFIG_X86_X32_ABI
 176 #define COMPAT_USE_64BIT_TIME \
 177         (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
 178 #endif
 179
 180 static inline void __user *arch_compat_alloc_user_space(long len)
 181 {
 182         compat_uptr_t sp;
 183
 184         if (test_thread_flag(TIF_IA32)) {
 185                 sp = task_pt_regs(current)->sp;
 186         } else {
 187                 /* -128 for the x32 ABI redzone */
 188                 sp = task_pt_regs(current)->sp - 128;
 189         }
 190
 191         return (void __user *)round_down(sp - len, 16);
 192 }
 193
 194 static inline bool in_x32_syscall(void)
 195 {
 196 #ifdef CONFIG_X86_X32_ABI
 197         if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
 198                 return true;
 199 #endif
 200         return false;
 201 }
 202
 203 static inline bool in_32bit_syscall(void)
 204 {
 205         return in_ia32_syscall() || in_x32_syscall();
 206 }
 207
 208 #ifdef CONFIG_COMPAT
 209 static inline bool in_compat_syscall(void)
 210 {
 211         return in_32bit_syscall();
 212 }
 213 #define in_compat_syscall in_compat_syscall     /* override the generic impl */
 214 #endif
 215
 216 struct compat_siginfo;
 217 int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
 218                 const kernel_siginfo_t *from, bool x32_ABI);
 219
 220 #endif /* _ASM_X86_COMPAT_H */