gdb/mips-nbsd-nat.c

   1 /* Native-dependent code for MIPS systems running NetBSD.
   2
   3    Copyright (C) 2000-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* We define this to get types like register_t.  */
  21 #define _KERNTYPES
  22 #include "defs.h"
  23 #include "inferior.h"
  24 #include "regcache.h"
  25 #include "target.h"
  26
  27 #include <sys/types.h>
  28 #include <sys/ptrace.h>
  29 #include <machine/reg.h>
  30
  31 #include "mips-tdep.h"
  32 #include "mips-nbsd-tdep.h"
  33 #include "inf-ptrace.h"
  34
  35 class mips_nbsd_nat_target final : public inf_ptrace_target
  36 {
  37   void fetch_registers (struct regcache *, int) override;
  38   void store_registers (struct regcache *, int) override;
  39 };
  40
  41 static mips_nbsd_nat_target the_mips_nbsd_nat_target;
  42
  43 /* Determine if PT_GETREGS fetches this register.  */
  44 static int
  45 getregs_supplies (struct gdbarch *gdbarch, int regno)
  46 {
  47   return ((regno) >= MIPS_ZERO_REGNUM
  48           && (regno) <= gdbarch_pc_regnum (gdbarch));
  49 }
  50
  51 void
  52 mips_nbsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
  53 {
  54   pid_t pid = regcache->ptid ().pid ();
  55
  56   struct gdbarch *gdbarch = regcache->arch ();
  57   if (regno == -1 || getregs_supplies (gdbarch, regno))
  58     {
  59       struct reg regs;
  60
  61       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  62         perror_with_name (_("Couldn't get registers"));
  63
  64       mipsnbsd_supply_reg (regcache, (char *) &regs, regno);
  65       if (regno != -1)
  66         return;
  67     }
  68
  69   if (regno == -1
  70       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
  71     {
  72       struct fpreg fpregs;
  73
  74       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  75         perror_with_name (_("Couldn't get floating point status"));
  76
  77       mipsnbsd_supply_fpreg (regcache, (char *) &fpregs, regno);
  78     }
  79 }
  80
  81 void
  82 mips_nbsd_nat_target::store_registers (struct regcache *regcache, int regno)
  83 {
  84   pid_t pid = regcache->ptid ().pid ();
  85
  86   struct gdbarch *gdbarch = regcache->arch ();
  87   if (regno == -1 || getregs_supplies (gdbarch, regno))
  88     {
  89       struct reg regs;
  90
  91       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  92         perror_with_name (_("Couldn't get registers"));
  93
  94       mipsnbsd_fill_reg (regcache, (char *) &regs, regno);
  95
  96       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  97         perror_with_name (_("Couldn't write registers"));
  98
  99       if (regno != -1)
 100         return;
 101     }
 102
 103   if (regno == -1
 104       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
 105     {
 106       struct fpreg fpregs;
 107
 108       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 109         perror_with_name (_("Couldn't get floating point status"));
 110
 111       mipsnbsd_fill_fpreg (regcache, (char *) &fpregs, regno);
 112
 113       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 114         perror_with_name (_("Couldn't write floating point status"));
 115     }
 116 }
 117
 118 void _initialize_mipsnbsd_nat ();
 119 void
 120 _initialize_mipsnbsd_nat ()
 121 {
 122   add_inf_child_target (&the_mips_nbsd_nat_target);
 123 }