gdb/sh-nbsd-nat.c

   1 /* Native-dependent code for NetBSD/sh.
   2
   3    Copyright (C) 2002-2020 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 "nbsd-nat.h"
  32 #include "regcache.h"
  33
  34 struct sh_nbsd_nat_target final : public nbsd_nat_target
  35 {
  36   void fetch_registers (struct regcache *, int) override;
  37   void store_registers (struct regcache *, int) override;
  38 };
  39
  40 static sh_nbsd_nat_target the_sh_nbsd_nat_target;
  41
  42 /* Determine if PT_GETREGS fetches this register.  */
  43 #define GETREGS_SUPPLIES(gdbarch, regno) \
  44   (((regno) >= R0_REGNUM && (regno) <= (R0_REGNUM + 15)) \
  45 || (regno) == gdbarch_pc_regnum (gdbarch) || (regno) == PR_REGNUM \
  46 || (regno) == MACH_REGNUM || (regno) == MACL_REGNUM \
  47 || (regno) == SR_REGNUM)
  48
  49 /* Sizeof `struct reg' in <machine/reg.h>.  */
  50 #define SHNBSD_SIZEOF_GREGS     (21 * 4)
  51
  52 void
  53 sh_nbsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
  54 {
  55   pid_t pid = regcache->ptid ().pid ();
  56   int lwp = regcache->ptid ().lwp ();
  57
  58   if (regno == -1 || GETREGS_SUPPLIES (regcache->arch (), regno))
  59     {
  60       struct reg inferior_registers;
  61
  62       if (ptrace (PT_GETREGS, pid,
  63                   (PTRACE_TYPE_ARG3) &inferior_registers, lwp) == -1)
  64         perror_with_name (_("Couldn't get registers"));
  65
  66       sh_corefile_supply_regset (&sh_corefile_gregset, regcache, regno,
  67                                  (char *) &inferior_registers,
  68                                  SHNBSD_SIZEOF_GREGS);
  69
  70       if (regno != -1)
  71         return;
  72     }
  73 }
  74
  75 void
  76 sh_nbsd_nat_target::store_registers (struct regcache *regcache, int regno)
  77 {
  78   pid_t pid = regcache->ptid ().pid ();
  79   int lwp = regcache->ptid ().lwp ();
  80
  81   if (regno == -1 || GETREGS_SUPPLIES (regcache->arch (), regno))
  82     {
  83       struct reg inferior_registers;
  84
  85       if (ptrace (PT_GETREGS, pid,
  86                   (PTRACE_TYPE_ARG3) &inferior_registers, lwp) == -1)
  87         perror_with_name (_("Couldn't get registers"));
  88
  89       sh_corefile_collect_regset (&sh_corefile_gregset, regcache, regno,
  90                                   (char *) &inferior_registers,
  91                                   SHNBSD_SIZEOF_GREGS);
  92
  93       if (ptrace (PT_SETREGS, pid,
  94                   (PTRACE_TYPE_ARG3) &inferior_registers, lwp) == -1)
  95         perror_with_name (_("Couldn't set registers"));
  96
  97       if (regno != -1)
  98         return;
  99     }
 100 }
 101
 102 void _initialize_shnbsd_nat ();
 103 void
 104 _initialize_shnbsd_nat ()
 105 {
 106   add_inf_child_target (&the_sh_nbsd_nat_target);
 107 }