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 "regcache.h"
  32
  33 struct sh_nbsd_nat_target final : public inf_ptrace_target
  34 {
  35   void fetch_registers (struct regcache *, int) override;
  36   void store_registers (struct regcache *, int) override;
  37 };
  38
  39 static sh_nbsd_nat_target the_sh_nbsd_nat_target;
  40
  41 /* Determine if PT_GETREGS fetches this register.  */
  42 #define GETREGS_SUPPLIES(gdbarch, regno) \
  43   (((regno) >= R0_REGNUM && (regno) <= (R0_REGNUM + 15)) \
  44 || (regno) == gdbarch_pc_regnum (gdbarch) || (regno) == PR_REGNUM \
  45 || (regno) == MACH_REGNUM || (regno) == MACL_REGNUM \
  46 || (regno) == SR_REGNUM)
  47
  48 /* Sizeof `struct reg' in <machine/reg.h>.  */
  49 #define SHNBSD_SIZEOF_GREGS     (21 * 4)
  50
  51 void
  52 sh_nbsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
  53 {
  54   pid_t pid = regcache->ptid ().pid ();
  55
  56   if (regno == -1 || GETREGS_SUPPLIES (regcache->arch (), regno))
  57     {
  58       struct reg inferior_registers;
  59
  60       if (ptrace (PT_GETREGS, pid,
  61                   (PTRACE_TYPE_ARG3) &inferior_registers, 0) == -1)
  62         perror_with_name (_("Couldn't get registers"));
  63
  64       sh_corefile_supply_regset (&sh_corefile_gregset, regcache, regno,
  65                                  (char *) &inferior_registers,
  66                                  SHNBSD_SIZEOF_GREGS);
  67
  68       if (regno != -1)
  69         return;
  70     }
  71 }
  72
  73 void
  74 sh_nbsd_nat_target::store_registers (struct regcache *regcache, int regno)
  75 {
  76   pid_t pid = regcache->ptid ().pid ();
  77
  78   if (regno == -1 || GETREGS_SUPPLIES (regcache->arch (), regno))
  79     {
  80       struct reg inferior_registers;
  81
  82       if (ptrace (PT_GETREGS, pid,
  83                   (PTRACE_TYPE_ARG3) &inferior_registers, 0) == -1)
  84         perror_with_name (_("Couldn't get registers"));
  85
  86       sh_corefile_collect_regset (&sh_corefile_gregset, regcache, regno,
  87                                   (char *) &inferior_registers,
  88                                   SHNBSD_SIZEOF_GREGS);
  89
  90       if (ptrace (PT_SETREGS, pid,
  91                   (PTRACE_TYPE_ARG3) &inferior_registers, 0) == -1)
  92         perror_with_name (_("Couldn't set registers"));
  93
  94       if (regno != -1)
  95         return;
  96     }
  97 }
  98
  99 void
 100 _initialize_shnbsd_nat (void)
 101 {
 102   add_inf_child_target (&the_sh_nbsd_nat_target);
 103 }