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
  31 struct compat_stat {
  32         compat_dev_t    st_dev;
  33         u16             __pad1;
  34         compat_ino_t    st_ino;
  35         compat_mode_t   st_mode;
  36         compat_nlink_t  st_nlink;
  37         __compat_uid_t  st_uid;
  38         __compat_gid_t  st_gid;
  39         compat_dev_t    st_rdev;
  40         u16             __pad2;
  41         u32             st_size;
  42         u32             st_blksize;
  43         u32             st_blocks;
  44         u32             st_atime;
  45         u32             st_atime_nsec;
  46         u32             st_mtime;
  47         u32             st_mtime_nsec;
  48         u32             st_ctime;
  49         u32             st_ctime_nsec;
  50         u32             __unused4;
  51         u32             __unused5;
  52 };
  53
  54 struct compat_flock {
  55         short           l_type;
  56         short           l_whence;
  57         compat_off_t    l_start;
  58         compat_off_t    l_len;
  59         compat_pid_t    l_pid;
  60 };
  61
  62 #define F_GETLK64       12      /*  using 'struct flock64' */
  63 #define F_SETLK64       13
  64 #define F_SETLKW64      14
  65
  66 /*
  67  * IA32 uses 4 byte alignment for 64 bit quantities,
  68  * so we need to pack this structure.
  69  */
  70 struct compat_flock64 {
  71         short           l_type;
  72         short           l_whence;
  73         compat_loff_t   l_start;
  74         compat_loff_t   l_len;
  75         compat_pid_t    l_pid;
  76 } __attribute__((packed));
  77
  78 struct compat_statfs {
  79         int             f_type;
  80         int             f_bsize;
  81         int             f_blocks;
  82         int             f_bfree;
  83         int             f_bavail;
  84         int             f_files;
  85         int             f_ffree;
  86         compat_fsid_t   f_fsid;
  87         int             f_namelen;      /* SunOS ignores this field. */
  88         int             f_frsize;
  89         int             f_flags;
  90         int             f_spare[4];
  91 };
  92
  93 #define COMPAT_RLIM_INFINITY            0xffffffff
  94
  95 typedef u32             compat_old_sigset_t;    /* at least 32 bits */
  96
  97 #define _COMPAT_NSIG            64
  98 #define _COMPAT_NSIG_BPW        32
  99
 100 typedef u32               compat_sigset_word;
 101
 102 #define COMPAT_OFF_T_MAX        0x7fffffff
 103
 104 struct compat_ipc64_perm {
 105         compat_key_t key;
 106         __compat_uid32_t uid;
 107         __compat_gid32_t gid;
 108         __compat_uid32_t cuid;
 109         __compat_gid32_t cgid;
 110         unsigned short mode;
 111         unsigned short __pad1;
 112         unsigned short seq;
 113         unsigned short __pad2;
 114         compat_ulong_t unused1;
 115         compat_ulong_t unused2;
 116 };
 117
 118 struct compat_semid64_ds {
 119         struct compat_ipc64_perm sem_perm;
 120         compat_ulong_t sem_otime;
 121         compat_ulong_t sem_otime_high;
 122         compat_ulong_t sem_ctime;
 123         compat_ulong_t sem_ctime_high;
 124         compat_ulong_t sem_nsems;
 125         compat_ulong_t __unused3;
 126         compat_ulong_t __unused4;
 127 };
 128
 129 struct compat_msqid64_ds {
 130         struct compat_ipc64_perm msg_perm;
 131         compat_ulong_t msg_stime;
 132         compat_ulong_t msg_stime_high;
 133         compat_ulong_t msg_rtime;
 134         compat_ulong_t msg_rtime_high;
 135         compat_ulong_t msg_ctime;
 136         compat_ulong_t msg_ctime_high;
 137         compat_ulong_t msg_cbytes;
 138         compat_ulong_t msg_qnum;
 139         compat_ulong_t msg_qbytes;
 140         compat_pid_t   msg_lspid;
 141         compat_pid_t   msg_lrpid;
 142         compat_ulong_t __unused4;
 143         compat_ulong_t __unused5;
 144 };
 145
 146 struct compat_shmid64_ds {
 147         struct compat_ipc64_perm shm_perm;
 148         compat_size_t  shm_segsz;
 149         compat_ulong_t shm_atime;
 150         compat_ulong_t shm_atime_high;
 151         compat_ulong_t shm_dtime;
 152         compat_ulong_t shm_dtime_high;
 153         compat_ulong_t shm_ctime;
 154         compat_ulong_t shm_ctime_high;
 155         compat_pid_t   shm_cpid;
 156         compat_pid_t   shm_lpid;
 157         compat_ulong_t shm_nattch;
 158         compat_ulong_t __unused4;
 159         compat_ulong_t __unused5;
 160 };
 161
 162 /*
 163  * The type of struct elf_prstatus.pr_reg in compatible core dumps.
 164  */
 165 typedef struct user_regs_struct compat_elf_gregset_t;
 166
 167 /* Full regset -- prstatus on x32, otherwise on ia32 */
 168 #define PRSTATUS_SIZE(S, R) (R != sizeof(S.pr_reg) ? 144 : 296)
 169 #define SET_PR_FPVALID(S, V, R) \
 170   do { *(int *) (((void *) &((S)->pr_reg)) + R) = (V); } \
 171   while (0)
 172
 173 #ifdef CONFIG_X86_X32_ABI
 174 #define COMPAT_USE_64BIT_TIME \
 175         (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
 176 #endif
 177
 178 static inline void __user *arch_compat_alloc_user_space(long len)
 179 {
 180         compat_uptr_t sp = task_pt_regs(current)->sp;
 181
 182         /*
 183          * -128 for the x32 ABI redzone.  For IA32, it is not strictly
 184          * necessary, but not harmful.
 185          */
 186         sp -= 128;
 187
 188         return (void __user *)round_down(sp - len, 16);
 189 }
 190
 191 static inline bool in_x32_syscall(void)
 192 {
 193 #ifdef CONFIG_X86_X32_ABI
 194         if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
 195                 return true;
 196 #endif
 197         return false;
 198 }
 199
 200 static inline bool in_32bit_syscall(void)
 201 {
 202         return in_ia32_syscall() || in_x32_syscall();
 203 }
 204
 205 #ifdef CONFIG_COMPAT
 206 static inline bool in_compat_syscall(void)
 207 {
 208         return in_32bit_syscall();
 209 }
 210 #define in_compat_syscall in_compat_syscall     /* override the generic impl */
 211 #define compat_need_64bit_alignment_fixup in_ia32_syscall
 212 #endif
 213
 214 struct compat_siginfo;
 215
 216 #ifdef CONFIG_X86_X32_ABI
 217 int copy_siginfo_to_user32(struct compat_siginfo __user *to,
 218                 const kernel_siginfo_t *from);
 219 #define copy_siginfo_to_user32 copy_siginfo_to_user32
 220 #endif /* CONFIG_X86_X32_ABI */
 221
 222 #endif /* _ASM_X86_COMPAT_H */