gdb/mips-nbsd-nat.c

   1 /* Native-dependent code for MIPS systems running NetBSD.
   2
   3    Copyright (C) 2000-2019 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 #include "defs.h"
  21 #include "inferior.h"
  22 #include "regcache.h"
  23 #include "target.h"
  24
  25 #include <sys/types.h>
  26 #include <sys/ptrace.h>
  27 #include <machine/reg.h>
  28
  29 #include "mips-tdep.h"
  30 #include "mips-nbsd-tdep.h"
  31 #include "inf-ptrace.h"
  32
  33 class mips_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 mips_nbsd_nat_target the_mips_nbsd_nat_target;
  40
  41 /* Determine if PT_GETREGS fetches this register.  */
  42 static int
  43 getregs_supplies (struct gdbarch *gdbarch, int regno)
  44 {
  45   return ((regno) >= MIPS_ZERO_REGNUM
  46           && (regno) <= gdbarch_pc_regnum (gdbarch));
  47 }
  48
  49 void
  50 mips_nbsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
  51 {
  52   pid_t pid = regcache->ptid ().pid ();
  53
  54   struct gdbarch *gdbarch = regcache->arch ();
  55   if (regno == -1 || getregs_supplies (gdbarch, regno))
  56     {
  57       struct reg regs;
  58
  59       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  60         perror_with_name (_("Couldn't get registers"));
  61
  62       mipsnbsd_supply_reg (regcache, (char *) &regs, regno);
  63       if (regno != -1)
  64         return;
  65     }
  66
  67   if (regno == -1
  68       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
  69     {
  70       struct fpreg fpregs;
  71
  72       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  73         perror_with_name (_("Couldn't get floating point status"));
  74
  75       mipsnbsd_supply_fpreg (regcache, (char *) &fpregs, regno);
  76     }
  77 }
  78
  79 void
  80 mips_nbsd_nat_target::store_registers (struct regcache *regcache, int regno)
  81 {
  82   pid_t pid = regcache->ptid ().pid ();
  83
  84   struct gdbarch *gdbarch = regcache->arch ();
  85   if (regno == -1 || getregs_supplies (gdbarch, regno))
  86     {
  87       struct reg regs;
  88
  89       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  90         perror_with_name (_("Couldn't get registers"));
  91
  92       mipsnbsd_fill_reg (regcache, (char *) &regs, regno);
  93
  94       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  95         perror_with_name (_("Couldn't write registers"));
  96
  97       if (regno != -1)
  98         return;
  99     }
 100
 101   if (regno == -1
 102       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
 103     {
 104       struct fpreg fpregs;
 105
 106       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 107         perror_with_name (_("Couldn't get floating point status"));
 108
 109       mipsnbsd_fill_fpreg (regcache, (char *) &fpregs, regno);
 110
 111       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 112         perror_with_name (_("Couldn't write floating point status"));
 113     }
 114 }
 115
 116 void
 117 _initialize_mipsnbsd_nat (void)
 118 {
 119   add_inf_child_target (&the_mips_nbsd_nat_target);
 120 }