gdb/sh-nbsd-nat.c

   1 /* Native-dependent code for NetBSD/sh.
   2
   3    Copyright (C) 2002-2017 Free Software Foundation, Inc.
   4
   5    Contributed by Wasabi Systems, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "defs.h"
  23 #include "inferior.h"
  24
  25 #include <sys/types.h>
  26 #include <sys/ptrace.h>
  27 #include <machine/reg.h>
  28
  29 #include "sh-tdep.h"
  30 #include "inf-ptrace.h"
  31 #include "regcache.h"
  32
  33
  34 /* Determine if PT_GETREGS fetches this register.  */
  35 #define GETREGS_SUPPLIES(gdbarch, regno) \
  36   (((regno) >= R0_REGNUM && (regno) <= (R0_REGNUM + 15)) \
  37 || (regno) == gdbarch_pc_regnum (gdbarch) || (regno) == PR_REGNUM \
  38 || (regno) == MACH_REGNUM || (regno) == MACL_REGNUM \
  39 || (regno) == SR_REGNUM)
  40
  41 /* Sizeof `struct reg' in <machine/reg.h>.  */
  42 #define SHNBSD_SIZEOF_GREGS     (21 * 4)
  43
  44 static void
  45 shnbsd_fetch_inferior_registers (struct target_ops *ops,
  46                                  struct regcache *regcache, int regno)
  47 {
  48   pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
  49
  50   if (regno == -1 || GETREGS_SUPPLIES (get_regcache_arch (regcache), regno))
  51     {
  52       struct reg inferior_registers;
  53
  54       if (ptrace (PT_GETREGS, pid,
  55                   (PTRACE_TYPE_ARG3) &inferior_registers, 0) == -1)
  56         perror_with_name (_("Couldn't get registers"));
  57
  58       sh_corefile_supply_regset (&sh_corefile_gregset, regcache, regno,
  59                                  (char *) &inferior_registers,
  60                                  SHNBSD_SIZEOF_GREGS);
  61
  62       if (regno != -1)
  63         return;
  64     }
  65 }
  66
  67 static void
  68 shnbsd_store_inferior_registers (struct target_ops *ops,
  69                                  struct regcache *regcache, int regno)
  70 {
  71   pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
  72
  73   if (regno == -1 || GETREGS_SUPPLIES (get_regcache_arch (regcache), regno))
  74     {
  75       struct reg inferior_registers;
  76
  77       if (ptrace (PT_GETREGS, pid,
  78                   (PTRACE_TYPE_ARG3) &inferior_registers, 0) == -1)
  79         perror_with_name (_("Couldn't get registers"));
  80
  81       sh_corefile_collect_regset (&sh_corefile_gregset, regcache, regno,
  82                                   (char *) &inferior_registers,
  83                                   SHNBSD_SIZEOF_GREGS);
  84
  85       if (ptrace (PT_SETREGS, pid,
  86                   (PTRACE_TYPE_ARG3) &inferior_registers, 0) == -1)
  87         perror_with_name (_("Couldn't set registers"));
  88
  89       if (regno != -1)
  90         return;
  91     }
  92 }
  93
  94 void
  95 _initialize_shnbsd_nat (void)
  96 {
  97   struct target_ops *t;
  98
  99   t = inf_ptrace_target ();
 100   t->to_fetch_registers = shnbsd_fetch_inferior_registers;
 101   t->to_store_registers = shnbsd_store_inferior_registers;
 102   add_target (t);
 103 }