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_mode_t   compat_mode_t
  16 typedef u16             compat_mode_t;
  17
  18 #include <asm-generic/compat.h>
  19
  20 #define COMPAT_USER_HZ          100
  21 #define COMPAT_UTS_MACHINE      "i686\0\0"
  22
  23 typedef u16             __compat_uid_t;
  24 typedef u16             __compat_gid_t;
  25 typedef u16             compat_dev_t;
  26 typedef u16             compat_nlink_t;
  27 typedef u16             compat_ipc_pid_t;
  28 typedef __kernel_fsid_t compat_fsid_t;
  29
  30 struct compat_stat {
  31         u32             st_dev;
  32         compat_ino_t    st_ino;
  33         compat_mode_t   st_mode;
  34         compat_nlink_t  st_nlink;
  35         __compat_uid_t  st_uid;
  36         __compat_gid_t  st_gid;
  37         u32             st_rdev;
  38         u32             st_size;
  39         u32             st_blksize;
  40         u32             st_blocks;
  41         u32             st_atime;
  42         u32             st_atime_nsec;
  43         u32             st_mtime;
  44         u32             st_mtime_nsec;
  45         u32             st_ctime;
  46         u32             st_ctime_nsec;
  47         u32             __unused4;
  48         u32             __unused5;
  49 };
  50
  51 struct compat_flock {
  52         short           l_type;
  53         short           l_whence;
  54         compat_off_t    l_start;
  55         compat_off_t    l_len;
  56         compat_pid_t    l_pid;
  57 };
  58
  59 #define F_GETLK64       12      /*  using 'struct flock64' */
  60 #define F_SETLK64       13
  61 #define F_SETLKW64      14
  62
  63 /*
  64  * IA32 uses 4 byte alignment for 64 bit quantities,
  65  * so we need to pack this structure.
  66  */
  67 struct compat_flock64 {
  68         short           l_type;
  69         short           l_whence;
  70         compat_loff_t   l_start;
  71         compat_loff_t   l_len;
  72         compat_pid_t    l_pid;
  73 } __attribute__((packed));
  74
  75 struct compat_statfs {
  76         int             f_type;
  77         int             f_bsize;
  78         int             f_blocks;
  79         int             f_bfree;
  80         int             f_bavail;
  81         int             f_files;
  82         int             f_ffree;
  83         compat_fsid_t   f_fsid;
  84         int             f_namelen;      /* SunOS ignores this field. */
  85         int             f_frsize;
  86         int             f_flags;
  87         int             f_spare[4];
  88 };
  89
  90 #define COMPAT_RLIM_INFINITY            0xffffffff
  91
  92 #define COMPAT_OFF_T_MAX        0x7fffffff
  93
  94 struct compat_ipc64_perm {
  95         compat_key_t key;
  96         __compat_uid32_t uid;
  97         __compat_gid32_t gid;
  98         __compat_uid32_t cuid;
  99         __compat_gid32_t cgid;
 100         unsigned short mode;
 101         unsigned short __pad1;
 102         unsigned short seq;
 103         unsigned short __pad2;
 104         compat_ulong_t unused1;
 105         compat_ulong_t unused2;
 106 };
 107
 108 struct compat_semid64_ds {
 109         struct compat_ipc64_perm sem_perm;
 110         compat_ulong_t sem_otime;
 111         compat_ulong_t sem_otime_high;
 112         compat_ulong_t sem_ctime;
 113         compat_ulong_t sem_ctime_high;
 114         compat_ulong_t sem_nsems;
 115         compat_ulong_t __unused3;
 116         compat_ulong_t __unused4;
 117 };
 118
 119 struct compat_msqid64_ds {
 120         struct compat_ipc64_perm msg_perm;
 121         compat_ulong_t msg_stime;
 122         compat_ulong_t msg_stime_high;
 123         compat_ulong_t msg_rtime;
 124         compat_ulong_t msg_rtime_high;
 125         compat_ulong_t msg_ctime;
 126         compat_ulong_t msg_ctime_high;
 127         compat_ulong_t msg_cbytes;
 128         compat_ulong_t msg_qnum;
 129         compat_ulong_t msg_qbytes;
 130         compat_pid_t   msg_lspid;
 131         compat_pid_t   msg_lrpid;
 132         compat_ulong_t __unused4;
 133         compat_ulong_t __unused5;
 134 };
 135
 136 struct compat_shmid64_ds {
 137         struct compat_ipc64_perm shm_perm;
 138         compat_size_t  shm_segsz;
 139         compat_ulong_t shm_atime;
 140         compat_ulong_t shm_atime_high;
 141         compat_ulong_t shm_dtime;
 142         compat_ulong_t shm_dtime_high;
 143         compat_ulong_t shm_ctime;
 144         compat_ulong_t shm_ctime_high;
 145         compat_pid_t   shm_cpid;
 146         compat_pid_t   shm_lpid;
 147         compat_ulong_t shm_nattch;
 148         compat_ulong_t __unused4;
 149         compat_ulong_t __unused5;
 150 };
 151
 152 #ifdef CONFIG_X86_X32_ABI
 153 #define COMPAT_USE_64BIT_TIME \
 154         (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
 155 #endif
 156
 157 static inline bool in_x32_syscall(void)
 158 {
 159 #ifdef CONFIG_X86_X32_ABI
 160         if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
 161                 return true;
 162 #endif
 163         return false;
 164 }
 165
 166 static inline bool in_32bit_syscall(void)
 167 {
 168         return in_ia32_syscall() || in_x32_syscall();
 169 }
 170
 171 #ifdef CONFIG_COMPAT
 172 static inline bool in_compat_syscall(void)
 173 {
 174         return in_32bit_syscall();
 175 }
 176 #define in_compat_syscall in_compat_syscall     /* override the generic impl */
 177 #define compat_need_64bit_alignment_fixup in_ia32_syscall
 178 #endif
 179
 180 struct compat_siginfo;
 181
 182 #ifdef CONFIG_X86_X32_ABI
 183 int copy_siginfo_to_user32(struct compat_siginfo __user *to,
 184                 const kernel_siginfo_t *from);
 185 #define copy_siginfo_to_user32 copy_siginfo_to_user32
 186 #endif /* CONFIG_X86_X32_ABI */
 187
 188 #endif /* _ASM_X86_COMPAT_H */