gdb/mips-nbsd-nat.c

   1 /* Native-dependent code for MIPS systems running NetBSD.
   2
   3    Copyright (C) 2000-2017 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 /* Determine if PT_GETREGS fetches this register.  */
  34 static int
  35 getregs_supplies (struct gdbarch *gdbarch, int regno)
  36 {
  37   return ((regno) >= MIPS_ZERO_REGNUM
  38           && (regno) <= gdbarch_pc_regnum (gdbarch));
  39 }
  40
  41 static void
  42 mipsnbsd_fetch_inferior_registers (struct target_ops *ops,
  43                                    struct regcache *regcache, int regno)
  44 {
  45   pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
  46
  47   struct gdbarch *gdbarch = regcache->arch ();
  48   if (regno == -1 || getregs_supplies (gdbarch, regno))
  49     {
  50       struct reg regs;
  51
  52       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  53         perror_with_name (_("Couldn't get registers"));
  54
  55       mipsnbsd_supply_reg (regcache, (char *) &regs, regno);
  56       if (regno != -1)
  57         return;
  58     }
  59
  60   if (regno == -1
  61       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
  62     {
  63       struct fpreg fpregs;
  64
  65       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  66         perror_with_name (_("Couldn't get floating point status"));
  67
  68       mipsnbsd_supply_fpreg (regcache, (char *) &fpregs, regno);
  69     }
  70 }
  71
  72 static void
  73 mipsnbsd_store_inferior_registers (struct target_ops *ops,
  74                                    struct regcache *regcache, int regno)
  75 {
  76   pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
  77
  78   struct gdbarch *gdbarch = regcache->arch ();
  79   if (regno == -1 || getregs_supplies (gdbarch, regno))
  80     {
  81       struct reg regs;
  82
  83       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  84         perror_with_name (_("Couldn't get registers"));
  85
  86       mipsnbsd_fill_reg (regcache, (char *) &regs, regno);
  87
  88       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  89         perror_with_name (_("Couldn't write registers"));
  90
  91       if (regno != -1)
  92         return;
  93     }
  94
  95   if (regno == -1
  96       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
  97     {
  98       struct fpreg fpregs;
  99
 100       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 101         perror_with_name (_("Couldn't get floating point status"));
 102
 103       mipsnbsd_fill_fpreg (regcache, (char *) &fpregs, regno);
 104
 105       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 106         perror_with_name (_("Couldn't write floating point status"));
 107     }
 108 }
 109
 110 void
 111 _initialize_mipsnbsd_nat (void)
 112 {
 113   struct target_ops *t;
 114
 115   t = inf_ptrace_target ();
 116   t->to_fetch_registers = mipsnbsd_fetch_inferior_registers;
 117   t->to_store_registers = mipsnbsd_store_inferior_registers;
 118   add_target (t);
 119 }