path: root/gdb/aarch64-linux-tdep.c

/* Target-dependent code for GNU/Linux AArch64.

   Copyright (C) 2009-2015 Free Software Foundation, Inc.
   Contributed by ARM Ltd.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "gdbarch.h"
#include "arch-utils.h"
#include "glibc-tdep.h"
#include "linux-tdep.h"
#include "aarch64-tdep.h"
#include "aarch64-linux-tdep.h"
#include "osabi.h"
#include "solib-svr4.h"
#include "symtab.h"
#include "tramp-frame.h"
#include "trad-frame.h"

#include "inferior.h"
#include "regcache.h"
#include "regset.h"

#include "cli/cli-utils.h"
#include "stap-probe.h"
#include "parser-defs.h"
#include "user-regs.h"
#include "xml-syscall.h"
#include <ctype.h>

#include "record-full.h"
#include "linux-record.h"

/* Signal frame handling.

      +------------+  ^
      | saved lr   |  |
   +->| saved fp   |--+
   |  |            |
   |  |            |
   |  +------------+
   |  | saved lr   |
   +--| saved fp   |
   ^  |            |
   |  |            |
   |  +------------+
   ^  |            |
   |  | signal     |
   |  |            |        SIGTRAMP_FRAME (struct rt_sigframe)
   |  | saved regs |
   +--| saved sp   |--> interrupted_sp
   |  | saved pc   |--> interrupted_pc
   |  |            |
   |  +------------+
   |  | saved lr   |--> default_restorer (movz x8, NR_sys_rt_sigreturn; svc 0)
   +--| saved fp   |<- FP
      |            |         NORMAL_FRAME
      |            |<- SP
      +------------+

  On signal delivery, the kernel will create a signal handler stack
  frame and setup the return address in LR to point at restorer stub.
  The signal stack frame is defined by:

  struct rt_sigframe
  {
    siginfo_t info;
    struct ucontext uc;
  };

  typedef struct
  {
    ...                                    128 bytes
  } siginfo_t;

  The ucontext has the following form:
  struct ucontext
  {
    unsigned long uc_flags;
    struct ucontext *uc_link;
    stack_t uc_stack;
    sigset_t uc_sigmask;
    struct sigcontext uc_mcontext;
  };

  typedef struct sigaltstack
  {
    void *ss_sp;
    int ss_flags;
    size_t ss_size;
  } stack_t;

  struct sigcontext
  {
    unsigned long fault_address;
    unsigned long regs[31];
    unsigned long sp;		/ * 31 * /
    unsigned long pc;		/ * 32 * /
    unsigned long pstate;	/ * 33 * /
    __u8 __reserved[4096]
  };

  The restorer stub will always have the form:

  d28015a8        movz    x8, #0xad
  d4000001        svc     #0x0

  This is a system call sys_rt_sigreturn.

  We detect signal frames by snooping the return code for the restorer
  instruction sequence.

  The handler then needs to recover the saved register set from
  ucontext.uc_mcontext.  */

/* These magic numbers need to reflect the layout of the kernel
   defined struct rt_sigframe and ucontext.  */
#define AARCH64_SIGCONTEXT_REG_SIZE             8
#define AARCH64_RT_SIGFRAME_UCONTEXT_OFFSET     128
#define AARCH64_UCONTEXT_SIGCONTEXT_OFFSET      176
#define AARCH64_SIGCONTEXT_XO_OFFSET            8

/* Implement the "init" method of struct tramp_frame.  */

static void
aarch64_linux_sigframe_init (const struct tramp_frame *self,
			     struct frame_info *this_frame,
			     struct trad_frame_cache *this_cache,
			     CORE_ADDR func)
{
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
  CORE_ADDR sp = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM);
  CORE_ADDR sigcontext_addr =
    sp
    + AARCH64_RT_SIGFRAME_UCONTEXT_OFFSET
    + AARCH64_UCONTEXT_SIGCONTEXT_OFFSET;
  int i;

  for (i = 0; i < 31; i++)
    {
      trad_frame_set_reg_addr (this_cache,
			       AARCH64_X0_REGNUM + i,
			       sigcontext_addr + AARCH64_SIGCONTEXT_XO_OFFSET
			       + i * AARCH64_SIGCONTEXT_REG_SIZE);
    }
  trad_frame_set_reg_addr (this_cache, AARCH64_SP_REGNUM,
			   sigcontext_addr + AARCH64_SIGCONTEXT_XO_OFFSET
			     + 31 * AARCH64_SIGCONTEXT_REG_SIZE);
  trad_frame_set_reg_addr (this_cache, AARCH64_PC_REGNUM,
			   sigcontext_addr + AARCH64_SIGCONTEXT_XO_OFFSET
			     + 32 * AARCH64_SIGCONTEXT_REG_SIZE);

  trad_frame_set_id (this_cache, frame_id_build (sp, func));
}

static const struct tramp_frame aarch64_linux_rt_sigframe =
{
  SIGTRAMP_FRAME,
  4,
  {
    /* movz x8, 0x8b (S=1,o=10,h=0,i=0x8b,r=8)
       Soo1 0010 1hhi iiii iiii iiii iiir rrrr  */
    {0xd2801168, -1},

    /* svc  0x0      (o=0, l=1)
       1101 0100 oooi iiii iiii iiii iii0 00ll  */
    {0xd4000001, -1},
    {TRAMP_SENTINEL_INSN, -1}
  },
  aarch64_linux_sigframe_init
};

/* Register maps.  */

static const struct regcache_map_entry aarch64_linux_gregmap[] =
  {
    { 31, AARCH64_X0_REGNUM, 8 }, /* x0 ... x30 */
    { 1, AARCH64_SP_REGNUM, 8 },
    { 1, AARCH64_PC_REGNUM, 8 },
    { 1, AARCH64_CPSR_REGNUM, 8 },
    { 0 }
  };

static const struct regcache_map_entry aarch64_linux_fpregmap[] =
  {
    { 32, AARCH64_V0_REGNUM, 16 }, /* v0 ... v31 */
    { 1, AARCH64_FPSR_REGNUM, 4 },
    { 1, AARCH64_FPCR_REGNUM, 4 },
    { 0 }
  };

/* Register set definitions.  */

const struct regset aarch64_linux_gregset =
  {
    aarch64_linux_gregmap,
    regcache_supply_regset, regcache_collect_regset
  };

const struct regset aarch64_linux_fpregset =
  {
    aarch64_linux_fpregmap,
    regcache_supply_regset, regcache_collect_regset
  };

/* Implement the "regset_from_core_section" gdbarch method.  */

static void
aarch64_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
					    iterate_over_regset_sections_cb *cb,
					    void *cb_data,
					    const struct regcache *regcache)
{
  cb (".reg", AARCH64_LINUX_SIZEOF_GREGSET, &aarch64_linux_gregset,
      NULL, cb_data);
  cb (".reg2", AARCH64_LINUX_SIZEOF_FPREGSET, &aarch64_linux_fpregset,
      NULL, cb_data);
}

/* Implementation of `gdbarch_stap_is_single_operand', as defined in
   gdbarch.h.  */

static int
aarch64_stap_is_single_operand (struct gdbarch *gdbarch, const char *s)
{
  return (*s == '#' || isdigit (*s) /* Literal number.  */
	  || *s == '[' /* Register indirection.  */
	  || isalpha (*s)); /* Register value.  */
}

/* This routine is used to parse a special token in AArch64's assembly.

   The special tokens parsed by it are:

      - Register displacement (e.g, [fp, #-8])

   It returns one if the special token has been parsed successfully,
   or zero if the current token is not considered special.  */

static int
aarch64_stap_parse_special_token (struct gdbarch *gdbarch,
				  struct stap_parse_info *p)
{
  if (*p->arg == '[')
    {
      /* Temporary holder for lookahead.  */
      const char *tmp = p->arg;
      char *endp;
      /* Used to save the register name.  */
      const char *start;
      char *regname;
      int len;
      int got_minus = 0;
      long displacement;
      struct stoken str;

      ++tmp;
      start = tmp;

      /* Register name.  */
      while (isalnum (*tmp))
	++tmp;

      if (*tmp != ',')
	return 0;

      len = tmp - start;
      regname = (char *) alloca (len + 2);

      strncpy (regname, start, len);
      regname[len] = '\0';

      if (user_reg_map_name_to_regnum (gdbarch, regname, len) == -1)
	error (_("Invalid register name `%s' on expression `%s'."),
	       regname, p->saved_arg);

      ++tmp;
      tmp = skip_spaces_const (tmp);
      /* Now we expect a number.  It can begin with '#' or simply
	 a digit.  */
      if (*tmp == '#')
	++tmp;

      if (*tmp == '-')
	{
	  ++tmp;
	  got_minus = 1;
	}
      else if (*tmp == '+')
	++tmp;

      if (!isdigit (*tmp))
	return 0;

      displacement = strtol (tmp, &endp, 10);
      tmp = endp;

      /* Skipping last `]'.  */
      if (*tmp++ != ']')
	return 0;

      /* The displacement.  */
      write_exp_elt_opcode (&p->pstate, OP_LONG);
      write_exp_elt_type (&p->pstate, builtin_type (gdbarch)->builtin_long);
      write_exp_elt_longcst (&p->pstate, displacement);
      write_exp_elt_opcode (&p->pstate, OP_LONG);
      if (got_minus)
	write_exp_elt_opcode (&p->pstate, UNOP_NEG);

      /* The register name.  */
      write_exp_elt_opcode (&p->pstate, OP_REGISTER);
      str.ptr = regname;
      str.length = len;
      write_exp_string (&p->pstate, str);
      write_exp_elt_opcode (&p->pstate, OP_REGISTER);

      write_exp_elt_opcode (&p->pstate, BINOP_ADD);

      /* Casting to the expected type.  */
      write_exp_elt_opcode (&p->pstate, UNOP_CAST);
      write_exp_elt_type (&p->pstate, lookup_pointer_type (p->arg_type));
      write_exp_elt_opcode (&p->pstate, UNOP_CAST);

      write_exp_elt_opcode (&p->pstate, UNOP_IND);

      p->arg = tmp;
    }
  else
    return 0;

  return 1;
}

/* Implement the "get_syscall_number" gdbarch method.  */

static LONGEST
aarch64_linux_get_syscall_number (struct gdbarch *gdbarch,
				  ptid_t ptid)
{
  struct regcache *regs = get_thread_regcache (ptid);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

  /* The content of register x8.  */
  gdb_byte buf[X_REGISTER_SIZE];
  /* The result.  */
  LONGEST ret;

  /* Getting the system call number from the register x8.  */
  regcache_cooked_read (regs, AARCH64_DWARF_X0 + 8, buf);

  ret = extract_signed_integer (buf, X_REGISTER_SIZE, byte_order);

  return ret;
}

/* AArch64 process record-replay constructs: syscall, signal etc.  */

struct linux_record_tdep aarch64_linux_record_tdep;

/* Enum that defines the AArch64 linux specific syscall identifiers used for
   process record/replay.  */

enum aarch64_syscall {
  aarch64_sys_io_setup = 0,
  aarch64_sys_io_destroy = 1,
  aarch64_sys_io_submit = 2,
  aarch64_sys_io_cancel = 3,
  aarch64_sys_io_getevents = 4,
  aarch64_sys_setxattr = 5,
  aarch64_sys_lsetxattr = 6,
  aarch64_sys_fsetxattr = 7,
  aarch64_sys_getxattr = 8,
  aarch64_sys_lgetxattr = 9,
  aarch64_sys_fgetxattr = 10,
  aarch64_sys_listxattr = 11,
  aarch64_sys_llistxattr = 12,
  aarch64_sys_flistxattr = 13,
  aarch64_sys_removexattr = 14,
  aarch64_sys_lremovexattr = 15,
  aarch64_sys_fremovexattr = 16,
  aarch64_sys_getcwd = 17,
  aarch64_sys_lookup_dcookie = 18,
  aarch64_sys_eventfd2 = 19,
  aarch64_sys_epoll_create1 = 20,
  aarch64_sys_epoll_ctl = 21,
  aarch64_sys_epoll_pwait = 22,
  aarch64_sys_dup = 23,
  aarch64_sys_dup3 = 24,
  aarch64_sys_fcntl = 25,
  aarch64_sys_inotify_init1 = 26,
  aarch64_sys_inotify_add_watch = 27,
  aarch64_sys_inotify_rm_watch = 28,
  aarch64_sys_ioctl = 29,
  aarch64_sys_ioprio_set = 30,
  aarch64_sys_ioprio_get = 31,
  aarch64_sys_flock = 32,
  aarch64_sys_mknod = 33,
  aarch64_sys_mkdir = 34,
  aarch64_sys_unlink = 35,
  aarch64_sys_symlink = 36,
  aarch64_sys_link = 37,
  aarch64_sys_rename = 38,
  aarch64_sys_umount2 = 39,
  aarch64_sys_mount = 40,
  aarch64_sys_pivot_root = 41,
  aarch64_sys_nfsservctl = 42,
  aarch64_sys_statfs = 43,
  aarch64_sys_fstatfs = 44,
  aarch64_sys_truncate = 45,
  aarch64_sys_ftruncate = 46,
  aarch64_sys_fallocate = 47,
  aarch64_sys_faccess = 48,
  aarch64_sys_chdir = 49,
  aarch64_sys_fchdir = 50,
  aarch64_sys_chroot = 51,
  aarch64_sys_fchmod = 52,
  aarch64_sys_fchmodat = 53,
  aarch64_sys_fchownat = 54,
  aarch64_sys_fchown = 55,
  aarch64_sys_open = 56,
  aarch64_sys_close = 57,
  aarch64_sys_vhangup = 58,
  aarch64_sys_pipe2 = 59,
  aarch64_sys_quotactl = 60,
  aarch64_sys_getdents64 = 61,
  aarch64_sys_lseek = 62,
  aarch64_sys_read = 63,
  aarch64_sys_write = 64,
  aarch64_sys_readv = 65,
  aarch64_sys_writev = 66,
  aarch64_sys_pread64 = 67,
  aarch64_sys_pwrite64 = 68,
  aarch64_sys_preadv = 69,
  aarch64_sys_pwritev = 70,
  aarch64_sys_sendfile = 71,
  aarch64_sys_pselect6 = 72,
  aarch64_sys_ppoll = 73,
  aarch64_sys_signalfd4 = 74,
  aarch64_sys_vmsplice = 75,
  aarch64_sys_splice = 76,
  aarch64_sys_tee = 77,
  aarch64_sys_readlink = 78,
  aarch64_sys_fstatat = 79,
  aarch64_sys_fstat = 80,
  aarch64_sys_sync = 81,
  aarch64_sys_fsync = 82,
  aarch64_sys_fdatasync = 83,
  aarch64_sys_sync_file_range2 = 84,
  aarch64_sys_sync_file_range = 84,
  aarch64_sys_timerfd_create = 85,
  aarch64_sys_timerfd_settime = 86,
  aarch64_sys_timerfd_gettime = 87,
  aarch64_sys_utimensat = 88,
  aarch64_sys_acct = 89,
  aarch64_sys_capget = 90,
  aarch64_sys_capset = 91,
  aarch64_sys_personality = 92,
  aarch64_sys_exit = 93,
  aarch64_sys_exit_group = 94,
  aarch64_sys_waitid = 95,
  aarch64_sys_set_tid_address = 96,
  aarch64_sys_unshare = 97,
  aarch64_sys_futex = 98,
  aarch64_sys_set_robust_list = 99,
  aarch64_sys_get_robust_list = 100,
  aarch64_sys_nanosleep = 101,
  aarch64_sys_getitimer = 102,
  aarch64_sys_setitimer = 103,
  aarch64_sys_kexec_load = 104,
  aarch64_sys_init_module = 105,
  aarch64_sys_delete_module = 106,
  aarch64_sys_timer_create = 107,
  aarch64_sys_timer_gettime = 108,
  aarch64_sys_timer_getoverrun = 109,
  aarch64_sys_timer_settime = 110,
  aarch64_sys_timer_delete = 111,
  aarch64_sys_clock_settime = 112,
  aarch64_sys_clock_gettime = 113,
  aarch64_sys_clock_getres = 114,
  aarch64_sys_clock_nanosleep = 115,
  aarch64_sys_syslog = 116,
  aarch64_sys_ptrace = 117,
  aarch64_sys_sched_setparam = 118,
  aarch64_sys_sched_setscheduler = 119,
  aarch64_sys_sched_getscheduler = 120,
  aarch64_sys_sched_getparam = 121,
  aarch64_sys_sched_setaffinity = 122,
  aarch64_sys_sched_getaffinity = 123,
  aarch64_sys_sched_yield = 124,
  aarch64_sys_sched_get_priority_max = 125,
  aarch64_sys_sched_get_priority_min = 126,
  aarch64_sys_sched_rr_get_interval = 127,
  aarch64_sys_kill = 129,
  aarch64_sys_tkill = 130,
  aarch64_sys_tgkill = 131,
  aarch64_sys_sigaltstack = 132,
  aarch64_sys_rt_sigsuspend = 133,
  aarch64_sys_rt_sigaction = 134,
  aarch64_sys_rt_sigprocmask = 135,
  aarch64_sys_rt_sigpending = 136,
  aarch64_sys_rt_sigtimedwait = 137,
  aarch64_sys_rt_sigqueueinfo = 138,
  aarch64_sys_rt_sigreturn = 139,
  aarch64_sys_setpriority = 140,
  aarch64_sys_getpriority = 141,
  aarch64_sys_reboot = 142,
  aarch64_sys_setregid = 143,
  aarch64_sys_setgid = 144,
  aarch64_sys_setreuid = 145,
  aarch64_sys_setuid = 146,
  aarch64_sys_setresuid = 147,
  aarch64_sys_getresuid = 148,
  aarch64_sys_setresgid = 149,
  aarch64_sys_getresgid = 150,
  aarch64_sys_setfsuid = 151,
  aarch64_sys_setfsgid = 152,
  aarch64_sys_times = 153,
  aarch64_sys_setpgid = 154,
  aarch64_sys_getpgid = 155,
  aarch64_sys_getsid = 156,
  aarch64_sys_setsid = 157,
  aarch64_sys_getgroups = 158,
  aarch64_sys_setgroups = 159,
  aarch64_sys_uname = 160,
  aarch64_sys_sethostname = 161,
  aarch64_sys_setdomainname = 162,
  aarch64_sys_getrlimit = 163,
  aarch64_sys_setrlimit = 164,
  aarch64_sys_getrusage = 165,
  aarch64_sys_umask = 166,
  aarch64_sys_prctl = 167,
  aarch64_sys_getcpu = 168,
  aarch64_sys_gettimeofday = 169,
  aarch64_sys_settimeofday = 170,
  aarch64_sys_adjtimex = 171,
  aarch64_sys_getpid = 172,
  aarch64_sys_getppid = 173,
  aarch64_sys_getuid = 174,
  aarch64_sys_geteuid = 175,
  aarch64_sys_getgid = 176,
  aarch64_sys_getegid = 177,
  aarch64_sys_gettid = 178,
  aarch64_sys_sysinfo = 179,
  aarch64_sys_mq_open = 180,
  aarch64_sys_mq_unlink = 181,
  aarch64_sys_mq_timedsend = 182,
  aarch64_sys_mq_timedreceive = 183,
  aarch64_sys_mq_notify = 184,
  aarch64_sys_mq_getsetattr = 185,
  aarch64_sys_msgget = 186,
  aarch64_sys_msgctl = 187,
  aarch64_sys_msgrcv = 188,
  aarch64_sys_msgsnd = 189,
  aarch64_sys_semget = 190,
  aarch64_sys_semctl = 191,
  aarch64_sys_semtimedop = 192,
  aarch64_sys_semop = 193,
  aarch64_sys_shmget = 194,
  aarch64_sys_shmctl = 195,
  aarch64_sys_shmat = 196,
  aarch64_sys_shmdt = 197,
  aarch64_sys_socket = 198,
  aarch64_sys_socketpair = 199,
  aarch64_sys_bind = 200,
  aarch64_sys_listen = 201,
  aarch64_sys_accept = 202,
  aarch64_sys_connect = 203,
  aarch64_sys_getsockname = 204,
  aarch64_sys_getpeername = 205,
  aarch64_sys_sendto = 206,
  aarch64_sys_recvfrom = 207,
  aarch64_sys_setsockopt = 208,
  aarch64_sys_getsockopt = 209,
  aarch64_sys_shutdown = 210,
  aarch64_sys_sendmsg = 211,
  aarch64_sys_recvmsg = 212,
  aarch64_sys_readahead = 213,
  aarch64_sys_brk = 214,
  aarch64_sys_munmap = 215,
  aarch64_sys_mremap = 216,
  aarch64_sys_add_key = 217,
  aarch64_sys_request_key = 218,
  aarch64_sys_keyctl = 219,
  aarch64_sys_clone = 220,
  aarch64_sys_execve = 221,
  aarch64_sys_mmap = 222,
  aarch64_sys_fadvise64 = 223,
  aarch64_sys_swapon = 224,
  aarch64_sys_swapoff = 225,
  aarch64_sys_mprotect = 226,
  aarch64_sys_msync = 227,
  aarch64_sys_mlock = 228,
  aarch64_sys_munlock = 229,
  aarch64_sys_mlockall = 230,
  aarch64_sys_munlockall = 231,
  aarch64_sys_mincore = 232,
  aarch64_sys_madvise = 233,
  aarch64_sys_remap_file_pages = 234,
  aarch64_sys_mbind = 235,
  aarch64_sys_get_mempolicy = 236,
  aarch64_sys_set_mempolicy = 237,
  aarch64_sys_migrate_pages = 238,
  aarch64_sys_move_pages = 239,
  aarch64_sys_rt_tgsigqueueinfo = 240,
  aarch64_sys_perf_event_open = 241,
  aarch64_sys_accept4 = 242,
  aarch64_sys_recvmmsg = 243,
  aarch64_sys_wait4 = 260,
  aarch64_sys_prlimit64 = 261,
  aarch64_sys_fanotify_init = 262,
  aarch64_sys_fanotify_mark = 263,
  aarch64_sys_name_to_handle_at = 264,
  aarch64_sys_open_by_handle_at = 265,
  aarch64_sys_clock_adjtime = 266,
  aarch64_sys_syncfs = 267,
  aarch64_sys_setns = 268,
  aarch64_sys_sendmmsg = 269,
  aarch64_sys_process_vm_readv = 270,
  aarch64_sys_process_vm_writev = 271,
  aarch64_sys_kcmp = 272,
  aarch64_sys_finit_module = 273,
  aarch64_sys_sched_setattr = 274,
  aarch64_sys_sched_getattr = 275,
};

/* aarch64_canonicalize_syscall maps syscall ids from the native AArch64
   linux set of syscall ids into a canonical set of syscall ids used by
   process record.  */

static enum gdb_syscall
aarch64_canonicalize_syscall (enum aarch64_syscall syscall_number)
{
#define SYSCALL_MAP(SYSCALL) case aarch64_sys_##SYSCALL: \
  return gdb_sys_##SYSCALL

  switch (syscall_number)
    {
      SYSCALL_MAP (io_setup);
      SYSCALL_MAP (io_destroy);
      SYSCALL_MAP (io_submit);
      SYSCALL_MAP (io_cancel);
      SYSCALL_MAP (io_getevents);

      SYSCALL_MAP (setxattr);
      SYSCALL_MAP (lsetxattr);
      SYSCALL_MAP (fsetxattr);
      SYSCALL_MAP (getxattr);
      SYSCALL_MAP (lgetxattr);
      SYSCALL_MAP (fgetxattr);
      SYSCALL_MAP (listxattr);
      SYSCALL_MAP (llistxattr);
      SYSCALL_MAP (flistxattr);
      SYSCALL_MAP (removexattr);
      SYSCALL_MAP (lremovexattr);
      SYSCALL_MAP (fremovexattr);
      SYSCALL_MAP (getcwd);
      SYSCALL_MAP (lookup_dcookie);

    case aarch64_sys_epoll_create1:
      return gdb_sys_epoll_create;

      SYSCALL_MAP (epoll_ctl);
      SYSCALL_MAP (epoll_pwait);
      SYSCALL_MAP (dup);
      SYSCALL_MAP (fcntl);
      SYSCALL_MAP (inotify_add_watch);
      SYSCALL_MAP (inotify_rm_watch);
      SYSCALL_MAP (ioctl);
      SYSCALL_MAP (ioprio_set);
      SYSCALL_MAP (ioprio_get);
      SYSCALL_MAP (flock);
      SYSCALL_MAP (mount);
      SYSCALL_MAP (nfsservctl);
      SYSCALL_MAP (statfs);
      SYSCALL_MAP (truncate);
      SYSCALL_MAP (ftruncate);
      SYSCALL_MAP (fchdir);
      SYSCALL_MAP (chroot);
      SYSCALL_MAP (fchmod);
      SYSCALL_MAP (fchmodat);
      SYSCALL_MAP (fchownat);
      SYSCALL_MAP (fchown);
      SYSCALL_MAP (close);
      SYSCALL_MAP (vhangup);
      SYSCALL_MAP (quotactl);
      SYSCALL_MAP (getdents64);
      SYSCALL_MAP (lseek);
      SYSCALL_MAP (read);
      SYSCALL_MAP (write);
      SYSCALL_MAP (readv);
      SYSCALL_MAP (writev);
      SYSCALL_MAP (pread64);
      SYSCALL_MAP (pwrite64);
      SYSCALL_MAP (sendfile);
      SYSCALL_MAP (pselect6);
      SYSCALL_MAP (ppoll);
      SYSCALL_MAP (vmsplice);
      SYSCALL_MAP (splice);
      SYSCALL_MAP (tee);
      SYSCALL_MAP (fstat);
      SYSCALL_MAP (sync);
      SYSCALL_MAP (fsync);
      SYSCALL_MAP (fdatasync);
      SYSCALL_MAP (sync_file_range);
      SYSCALL_MAP (acct);
      SYSCALL_MAP (capget);
      SYSCALL_MAP (capset);
      SYSCALL_MAP (personality);
      SYSCALL_MAP (exit);
      SYSCALL_MAP (exit_group);
      SYSCALL_MAP (waitid);
      SYSCALL_MAP (set_tid_address);
      SYSCALL_MAP (unshare);
      SYSCALL_MAP (futex);
      SYSCALL_MAP (set_robust_list);
      SYSCALL_MAP (get_robust_list);
      SYSCALL_MAP (nanosleep);

      SYSCALL_MAP (getitimer);
      SYSCALL_MAP (setitimer);
      SYSCALL_MAP (kexec_load);
      SYSCALL_MAP (init_module);
      SYSCALL_MAP (delete_module);
      SYSCALL_MAP (timer_create);
      SYSCALL_MAP (timer_settime);
      SYSCALL_MAP (timer_gettime);
      SYSCALL_MAP (timer_getoverrun);
      SYSCALL_MAP (timer_delete);
      SYSCALL_MAP (clock_settime);
      SYSCALL_MAP (clock_gettime);
      SYSCALL_MAP (clock_getres);
      SYSCALL_MAP (clock_nanosleep);
      SYSCALL_MAP (syslog);
      SYSCALL_MAP (ptrace);
      SYSCALL_MAP (sched_setparam);
      SYSCALL_MAP (sched_setscheduler);
      SYSCALL_MAP (sched_getscheduler);
      SYSCALL_MAP (sched_getparam);
      SYSCALL_MAP (sched_setaffinity);
      SYSCALL_MAP (sched_getaffinity);
      SYSCALL_MAP (sched_yield);
      SYSCALL_MAP (sched_get_priority_max);
      SYSCALL_MAP (sched_get_priority_min);
      SYSCALL_MAP (sched_rr_get_interval);
      SYSCALL_MAP (kill);
      SYSCALL_MAP (tkill);
      SYSCALL_MAP (tgkill);
      SYSCALL_MAP (sigaltstack);
      SYSCALL_MAP (rt_sigsuspend);
      SYSCALL_MAP (rt_sigaction);
      SYSCALL_MAP (rt_sigprocmask);
      SYSCALL_MAP (rt_sigpending);
      SYSCALL_MAP (rt_sigtimedwait);
      SYSCALL_MAP (rt_sigqueueinfo);
      SYSCALL_MAP (rt_sigreturn);
      SYSCALL_MAP (setpriority);
      SYSCALL_MAP (getpriority);
      SYSCALL_MAP (reboot);
      SYSCALL_MAP (setregid);
      SYSCALL_MAP (setgid);
      SYSCALL_MAP (setreuid);
      SYSCALL_MAP (setuid);
      SYSCALL_MAP (setresuid);
      SYSCALL_MAP (getresuid);
      SYSCALL_MAP (setresgid);
      SYSCALL_MAP (getresgid);
      SYSCALL_MAP (setfsuid);
      SYSCALL_MAP (setfsgid);
      SYSCALL_MAP (times);
      SYSCALL_MAP (setpgid);
      SYSCALL_MAP (getpgid);
      SYSCALL_MAP (getsid);
      SYSCALL_MAP (setsid);
      SYSCALL_MAP (getgroups);
      SYSCALL_MAP (setgroups);
      SYSCALL_MAP (uname);
      SYSCALL_MAP (sethostname);
      SYSCALL_MAP (setdomainname);
      SYSCALL_MAP (getrlimit);
      SYSCALL_MAP (setrlimit);
      SYSCALL_MAP (getrusage);
      SYSCALL_MAP (umask);
      SYSCALL_MAP (prctl);
      SYSCALL_MAP (gettimeofday);
      SYSCALL_MAP (settimeofday);
      SYSCALL_MAP (adjtimex);
      SYSCALL_MAP (getpid);
      SYSCALL_MAP (getppid);
      SYSCALL_MAP (getuid);
      SYSCALL_MAP (geteuid);
      SYSCALL_MAP (getgid);
      SYSCALL_MAP (getegid);
      SYSCALL_MAP (gettid);
      SYSCALL_MAP (sysinfo);
      SYSCALL_MAP (mq_open);
      SYSCALL_MAP (mq_unlink);
      SYSCALL_MAP (mq_timedsend);
      SYSCALL_MAP (mq_timedreceive);
      SYSCALL_MAP (mq_notify);
      SYSCALL_MAP (mq_getsetattr);
      SYSCALL_MAP (msgget);
      SYSCALL_MAP (msgctl);
      SYSCALL_MAP (msgrcv);
      SYSCALL_MAP (msgsnd);
      SYSCALL_MAP (semget);
      SYSCALL_MAP (semctl);
      SYSCALL_MAP (semtimedop);
      SYSCALL_MAP (semop);
      SYSCALL_MAP (shmget);
      SYSCALL_MAP (shmctl);
      SYSCALL_MAP (shmat);
      SYSCALL_MAP (shmdt);
      SYSCALL_MAP (socket);
      SYSCALL_MAP (socketpair);
      SYSCALL_MAP (bind);
      SYSCALL_MAP (listen);
      SYSCALL_MAP (accept);
      SYSCALL_MAP (connect);
      SYSCALL_MAP (getsockname);
      SYSCALL_MAP (getpeername);
      SYSCALL_MAP (sendto);
      SYSCALL_MAP (recvfrom);
      SYSCALL_MAP (setsockopt);
      SYSCALL_MAP (getsockopt);
      SYSCALL_MAP (shutdown);
      SYSCALL_MAP (sendmsg);
      SYSCALL_MAP (recvmsg);
      SYSCALL_MAP (readahead);
      SYSCALL_MAP (brk);
      SYSCALL_MAP (munmap);
      SYSCALL_MAP (mremap);
      SYSCALL_MAP (add_key);
      SYSCALL_MAP (request_key);
      SYSCALL_MAP (keyctl);
      SYSCALL_MAP (clone);
      SYSCALL_MAP (execve);

    case aarch64_sys_mmap:
      return gdb_sys_mmap2;

      SYSCALL_MAP (fadvise64);
      SYSCALL_MAP (swapon);
      SYSCALL_MAP (swapoff);
      SYSCALL_MAP (mprotect);
      SYSCALL_MAP (msync);
      SYSCALL_MAP (mlock);
      SYSCALL_MAP (munlock);
      SYSCALL_MAP (mlockall);
      SYSCALL_MAP (munlockall);
      SYSCALL_MAP (mincore);
      SYSCALL_MAP (madvise);
      SYSCALL_MAP (remap_file_pages);
      SYSCALL_MAP (mbind);
      SYSCALL_MAP (get_mempolicy);
      SYSCALL_MAP (set_mempolicy);
      SYSCALL_MAP (migrate_pages);
      SYSCALL_MAP (move_pages);

  default:
    return gdb_sys_no_syscall;
  }
}

/* Record all registers but PC register for process-record.  */

static int
aarch64_all_but_pc_registers_record (struct regcache *regcache)
{
  int i;

  for (i = AARCH64_X0_REGNUM; i < AARCH64_PC_REGNUM; i++)
    if (record_full_arch_list_add_reg (regcache, i))
      return -1;

  if (record_full_arch_list_add_reg (regcache, AARCH64_CPSR_REGNUM))
    return -1;

  return 0;
}

/* Handler for aarch64 system call instruction recording.  */

static int
aarch64_linux_syscall_record (struct regcache *regcache,
			      unsigned long svc_number)
{
  int ret = 0;
  enum gdb_syscall syscall_gdb;

  syscall_gdb =
    aarch64_canonicalize_syscall ((enum aarch64_syscall) svc_number);

  if (syscall_gdb < 0)
    {
      printf_unfiltered (_("Process record and replay target doesn't "
			   "support syscall number %s\n"),
			 plongest (svc_number));
      return -1;
    }

  if (syscall_gdb == gdb_sys_sigreturn
      || syscall_gdb == gdb_sys_rt_sigreturn)
   {
     if (aarch64_all_but_pc_registers_record (regcache))
       return -1;
     return 0;
   }

  ret = record_linux_system_call (syscall_gdb, regcache,
				  &aarch64_linux_record_tdep);
  if (ret != 0)
    return ret;

  /* Record the return value of the system call.  */
  if (record_full_arch_list_add_reg (regcache, AARCH64_X0_REGNUM))
    return -1;
  /* Record LR.  */
  if (record_full_arch_list_add_reg (regcache, AARCH64_LR_REGNUM))
    return -1;
  /* Record CPSR.  */
  if (record_full_arch_list_add_reg (regcache, AARCH64_CPSR_REGNUM))
    return -1;

  return 0;
}

static void
aarch64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  static const char *const stap_integer_prefixes[] = { "#", "", NULL };
  static const char *const stap_register_prefixes[] = { "", NULL };
  static const char *const stap_register_indirection_prefixes[] = { "[",
								    NULL };
  static const char *const stap_register_indirection_suffixes[] = { "]",
								    NULL };
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  tdep->lowest_pc = 0x8000;

  linux_init_abi (info, gdbarch);

  set_solib_svr4_fetch_link_map_offsets (gdbarch,
					 svr4_lp64_fetch_link_map_offsets);

  /* Enable TLS support.  */
  set_gdbarch_fetch_tls_load_module_address (gdbarch,
                                             svr4_fetch_objfile_link_map);

  /* Shared library handling.  */
  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
  set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);

  tramp_frame_prepend_unwinder (gdbarch, &aarch64_linux_rt_sigframe);

  /* Enable longjmp.  */
  tdep->jb_pc = 11;

  set_gdbarch_iterate_over_regset_sections
    (gdbarch, aarch64_linux_iterate_over_regset_sections);

  /* SystemTap related.  */
  set_gdbarch_stap_integer_prefixes (gdbarch, stap_integer_prefixes);
  set_gdbarch_stap_register_prefixes (gdbarch, stap_register_prefixes);
  set_gdbarch_stap_register_indirection_prefixes (gdbarch,
					    stap_register_indirection_prefixes);
  set_gdbarch_stap_register_indirection_suffixes (gdbarch,
					    stap_register_indirection_suffixes);
  set_gdbarch_stap_is_single_operand (gdbarch, aarch64_stap_is_single_operand);
  set_gdbarch_stap_parse_special_token (gdbarch,
					aarch64_stap_parse_special_token);

  /* Reversible debugging, process record.  */
  set_gdbarch_process_record (gdbarch, aarch64_process_record);
  /* Syscall record.  */
  tdep->aarch64_syscall_record = aarch64_linux_syscall_record;

  /* Initialize the aarch64_linux_record_tdep.  */
  /* These values are the size of the type that will be used in a system
     call.  They are obtained from Linux Kernel source.  */
  aarch64_linux_record_tdep.size_pointer
    = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT;
  aarch64_linux_record_tdep.size__old_kernel_stat = 32;
  aarch64_linux_record_tdep.size_tms = 32;
  aarch64_linux_record_tdep.size_loff_t = 8;
  aarch64_linux_record_tdep.size_flock = 32;
  aarch64_linux_record_tdep.size_oldold_utsname = 45;
  aarch64_linux_record_tdep.size_ustat = 32;
  aarch64_linux_record_tdep.size_old_sigaction = 152;
  aarch64_linux_record_tdep.size_old_sigset_t = 128;
  aarch64_linux_record_tdep.size_rlimit = 16;
  aarch64_linux_record_tdep.size_rusage = 144;
  aarch64_linux_record_tdep.size_timeval = 16;
  aarch64_linux_record_tdep.size_timezone = 8;
  aarch64_linux_record_tdep.size_old_gid_t = 2;
  aarch64_linux_record_tdep.size_old_uid_t = 2;
  aarch64_linux_record_tdep.size_fd_set = 128;
  aarch64_linux_record_tdep.size_dirent = 280;
  aarch64_linux_record_tdep.size_dirent64 = 280;
  aarch64_linux_record_tdep.size_statfs = 120;
  aarch64_linux_record_tdep.size_statfs64 = 120;
  aarch64_linux_record_tdep.size_sockaddr = 16;
  aarch64_linux_record_tdep.size_int
    = gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT;
  aarch64_linux_record_tdep.size_long
    = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
  aarch64_linux_record_tdep.size_ulong
    = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
  aarch64_linux_record_tdep.size_msghdr = 56;
  aarch64_linux_record_tdep.size_itimerval = 32;
  aarch64_linux_record_tdep.size_stat = 144;
  aarch64_linux_record_tdep.size_old_utsname = 325;
  aarch64_linux_record_tdep.size_sysinfo = 112;
  aarch64_linux_record_tdep.size_msqid_ds = 120;
  aarch64_linux_record_tdep.size_shmid_ds = 112;
  aarch64_linux_record_tdep.size_new_utsname = 390;
  aarch64_linux_record_tdep.size_timex = 208;
  aarch64_linux_record_tdep.size_mem_dqinfo = 24;
  aarch64_linux_record_tdep.size_if_dqblk = 72;
  aarch64_linux_record_tdep.size_fs_quota_stat = 80;
  aarch64_linux_record_tdep.size_timespec = 16;
  aarch64_linux_record_tdep.size_pollfd = 8;
  aarch64_linux_record_tdep.size_NFS_FHSIZE = 32;
  aarch64_linux_record_tdep.size_knfsd_fh = 132;
  aarch64_linux_record_tdep.size_TASK_COMM_LEN = 16;
  aarch64_linux_record_tdep.size_sigaction = 152;
  aarch64_linux_record_tdep.size_sigset_t = 128;
  aarch64_linux_record_tdep.size_siginfo_t = 128;
  aarch64_linux_record_tdep.size_cap_user_data_t = 8;
  aarch64_linux_record_tdep.size_stack_t = 24;
  aarch64_linux_record_tdep.size_off_t = 8;
  aarch64_linux_record_tdep.size_stat64 = 144;
  aarch64_linux_record_tdep.size_gid_t = 4;
  aarch64_linux_record_tdep.size_uid_t = 4;
  aarch64_linux_record_tdep.size_PAGE_SIZE = 4096;
  aarch64_linux_record_tdep.size_flock64 = 32;
  aarch64_linux_record_tdep.size_user_desc = 16;
  aarch64_linux_record_tdep.size_io_event = 32;
  aarch64_linux_record_tdep.size_iocb = 64;
  aarch64_linux_record_tdep.size_epoll_event = 12;
  aarch64_linux_record_tdep.size_itimerspec = 32;
  aarch64_linux_record_tdep.size_mq_attr = 64;
  aarch64_linux_record_tdep.size_siginfo = 128;
  aarch64_linux_record_tdep.size_termios = 60;
  aarch64_linux_record_tdep.size_termios2 = 44;
  aarch64_linux_record_tdep.size_pid_t = 4;
  aarch64_linux_record_tdep.size_winsize = 8;
  aarch64_linux_record_tdep.size_serial_struct = 72;
  aarch64_linux_record_tdep.size_serial_icounter_struct = 80;
  aarch64_linux_record_tdep.size_hayes_esp_config = 12;
  aarch64_linux_record_tdep.size_size_t = 8;
  aarch64_linux_record_tdep.size_iovec = 16;

  /* These values are the second argument of system call "sys_ioctl".
     They are obtained from Linux Kernel source.  */
  aarch64_linux_record_tdep.ioctl_TCGETS = 0x5401;
  aarch64_linux_record_tdep.ioctl_TCSETS = 0x5402;
  aarch64_linux_record_tdep.ioctl_TCSETSW = 0x5403;
  aarch64_linux_record_tdep.ioctl_TCSETSF = 0x5404;
  aarch64_linux_record_tdep.ioctl_TCGETA = 0x5405;
  aarch64_linux_record_tdep.ioctl_TCSETA = 0x5406;
  aarch64_linux_record_tdep.ioctl_TCSETAW = 0x5407;
  aarch64_linux_record_tdep.ioctl_TCSETAF = 0x5408;
  aarch64_linux_record_tdep.ioctl_TCSBRK = 0x5409;
  aarch64_linux_record_tdep.ioctl_TCXONC = 0x540a;
  aarch64_linux_record_tdep.ioctl_TCFLSH = 0x540b;
  aarch64_linux_record_tdep.ioctl_TIOCEXCL = 0x540c;
  aarch64_linux_record_tdep.ioctl_TIOCNXCL = 0x540d;
  aarch64_linux_record_tdep.ioctl_TIOCSCTTY = 0x540e;
  aarch64_linux_record_tdep.ioctl_TIOCGPGRP = 0x540f;
  aarch64_linux_record_tdep.ioctl_TIOCSPGRP = 0x5410;
  aarch64_linux_record_tdep.ioctl_TIOCOUTQ = 0x5411;
  aarch64_linux_record_tdep.ioctl_TIOCSTI = 0x5412;
  aarch64_linux_record_tdep.ioctl_TIOCGWINSZ = 0x5413;
  aarch64_linux_record_tdep.ioctl_TIOCSWINSZ = 0x5414;
  aarch64_linux_record_tdep.ioctl_TIOCMGET = 0x5415;
  aarch64_linux_record_tdep.ioctl_TIOCMBIS = 0x5416;
  aarch64_linux_record_tdep.ioctl_TIOCMBIC = 0x5417;
  aarch64_linux_record_tdep.ioctl_TIOCMSET = 0x5418;
  aarch64_linux_record_tdep.ioctl_TIOCGSOFTCAR = 0x5419;
  aarch64_linux_record_tdep.ioctl_TIOCSSOFTCAR = 0x541a;
  aarch64_linux_record_tdep.ioctl_FIONREAD = 0x541b;
  aarch64_linux_record_tdep.ioctl_TIOCINQ = 0x541b;
  aarch64_linux_record_tdep.ioctl_TIOCLINUX = 0x541c;
  aarch64_linux_record_tdep.ioctl_TIOCCONS = 0x541d;
  aarch64_linux_record_tdep.ioctl_TIOCGSERIAL = 0x541e;
  aarch64_linux_record_tdep.ioctl_TIOCSSERIAL = 0x541f;
  aarch64_linux_record_tdep.ioctl_TIOCPKT = 0x5420;
  aarch64_linux_record_tdep.ioctl_FIONBIO = 0x5421;
  aarch64_linux_record_tdep.ioctl_TIOCNOTTY = 0x5422;
  aarch64_linux_record_tdep.ioctl_TIOCSETD = 0x5423;
  aarch64_linux_record_tdep.ioctl_TIOCGETD = 0x5424;
  aarch64_linux_record_tdep.ioctl_TCSBRKP = 0x5425;
  aarch64_linux_record_tdep.ioctl_TIOCTTYGSTRUCT = 0x5426;
  aarch64_linux_record_tdep.ioctl_TIOCSBRK = 0x5427;
  aarch64_linux_record_tdep.ioctl_TIOCCBRK = 0x5428;
  aarch64_linux_record_tdep.ioctl_TIOCGSID = 0x5429;
  aarch64_linux_record_tdep.ioctl_TCGETS2 = 0x802c542a;
  aarch64_linux_record_tdep.ioctl_TCSETS2 = 0x402c542b;
  aarch64_linux_record_tdep.ioctl_TCSETSW2 = 0x402c542c;
  aarch64_linux_record_tdep.ioctl_TCSETSF2 = 0x402c542d;
  aarch64_linux_record_tdep.ioctl_TIOCGPTN = 0x80045430;
  aarch64_linux_record_tdep.ioctl_TIOCSPTLCK = 0x40045431;
  aarch64_linux_record_tdep.ioctl_FIONCLEX = 0x5450;
  aarch64_linux_record_tdep.ioctl_FIOCLEX = 0x5451;
  aarch64_linux_record_tdep.ioctl_FIOASYNC = 0x5452;
  aarch64_linux_record_tdep.ioctl_TIOCSERCONFIG = 0x5453;
  aarch64_linux_record_tdep.ioctl_TIOCSERGWILD = 0x5454;
  aarch64_linux_record_tdep.ioctl_TIOCSERSWILD = 0x5455;
  aarch64_linux_record_tdep.ioctl_TIOCGLCKTRMIOS = 0x5456;
  aarch64_linux_record_tdep.ioctl_TIOCSLCKTRMIOS = 0x5457;
  aarch64_linux_record_tdep.ioctl_TIOCSERGSTRUCT = 0x5458;
  aarch64_linux_record_tdep.ioctl_TIOCSERGETLSR = 0x5459;
  aarch64_linux_record_tdep.ioctl_TIOCSERGETMULTI = 0x545a;
  aarch64_linux_record_tdep.ioctl_TIOCSERSETMULTI = 0x545b;
  aarch64_linux_record_tdep.ioctl_TIOCMIWAIT = 0x545c;
  aarch64_linux_record_tdep.ioctl_TIOCGICOUNT = 0x545d;
  aarch64_linux_record_tdep.ioctl_TIOCGHAYESESP = 0x545e;
  aarch64_linux_record_tdep.ioctl_TIOCSHAYESESP = 0x545f;
  aarch64_linux_record_tdep.ioctl_FIOQSIZE = 0x5460;

  /* These values are the second argument of system call "sys_fcntl"
     and "sys_fcntl64".  They are obtained from Linux Kernel source.  */
  aarch64_linux_record_tdep.fcntl_F_GETLK = 5;
  aarch64_linux_record_tdep.fcntl_F_GETLK64 = 12;
  aarch64_linux_record_tdep.fcntl_F_SETLK64 = 13;
  aarch64_linux_record_tdep.fcntl_F_SETLKW64 = 14;

  /* The AArch64 syscall calling convention: reg x0-x6 for arguments,
     reg x8 for syscall number and return value in reg x0.  */
  aarch64_linux_record_tdep.arg1 = AARCH64_X0_REGNUM + 0;
  aarch64_linux_record_tdep.arg2 = AARCH64_X0_REGNUM + 1;
  aarch64_linux_record_tdep.arg3 = AARCH64_X0_REGNUM + 2;
  aarch64_linux_record_tdep.arg4 = AARCH64_X0_REGNUM + 3;
  aarch64_linux_record_tdep.arg5 = AARCH64_X0_REGNUM + 4;
  aarch64_linux_record_tdep.arg6 = AARCH64_X0_REGNUM + 5;
  aarch64_linux_record_tdep.arg7 = AARCH64_X0_REGNUM + 6;

  /* `catch syscall' */
  set_xml_syscall_file_name (gdbarch, "syscalls/aarch64-linux.xml");
  set_gdbarch_get_syscall_number (gdbarch, aarch64_linux_get_syscall_number);

  /* Displaced stepping.  */
  set_gdbarch_max_insn_length (gdbarch, 4 * DISPLACED_MODIFIED_INSNS);
  set_gdbarch_displaced_step_copy_insn (gdbarch,
					aarch64_displaced_step_copy_insn);
  set_gdbarch_displaced_step_fixup (gdbarch, aarch64_displaced_step_fixup);
  set_gdbarch_displaced_step_free_closure (gdbarch,
					   simple_displaced_step_free_closure);
  set_gdbarch_displaced_step_location (gdbarch, linux_displaced_step_location);
  set_gdbarch_displaced_step_hw_singlestep (gdbarch,
					    aarch64_displaced_step_hw_singlestep);
}

/* Provide a prototype to silence -Wmissing-prototypes.  */
extern initialize_file_ftype _initialize_aarch64_linux_tdep;

void
_initialize_aarch64_linux_tdep (void)
{
  gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_LINUX,
			  aarch64_linux_init_abi);
}