gdb/arm-fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/arm.
   2
   3    Copyright (C) 2017-2018 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 "target.h"
  22
  23 #include <sys/types.h>
  24 #include <sys/ptrace.h>
  25 #include <machine/reg.h>
  26
  27 #include "fbsd-nat.h"
  28 #include "arm-tdep.h"
  29 #include "arm-fbsd-tdep.h"
  30 #include "inf-ptrace.h"
  31
  32 struct arm_fbsd_nat_target : public fbsd_nat_target
  33 {
  34   void fetch_registers (struct regcache *, int) override;
  35   void store_registers (struct regcache *, int) override;
  36   const struct target_desc *read_description () override;
  37 };
  38
  39 static arm_fbsd_nat_target the_arm_fbsd_nat_target;
  40
  41 /* Determine if PT_GETREGS fetches REGNUM.  */
  42
  43 static bool
  44 getregs_supplies (struct gdbarch *gdbarch, int regnum)
  45 {
  46   return ((regnum >= ARM_A1_REGNUM && regnum <= ARM_PC_REGNUM)
  47           || regnum == ARM_PS_REGNUM);
  48 }
  49
  50 #ifdef PT_GETVFPREGS
  51 /* Determine if PT_GETVFPREGS fetches REGNUM.  */
  52
  53 static bool
  54 getvfpregs_supplies (struct gdbarch *gdbarch, int regnum)
  55 {
  56   return ((regnum >= ARM_D0_REGNUM && regnum <= ARM_D31_REGNUM)
  57           || regnum == ARM_FPSCR_REGNUM);
  58 }
  59 #endif
  60
  61 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  62    for all registers.  */
  63
  64 void
  65 arm_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
  66 {
  67   pid_t pid = get_ptrace_pid (regcache->ptid ());
  68
  69   struct gdbarch *gdbarch = regcache->arch ();
  70   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
  71     {
  72       struct reg regs;
  73
  74       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  75         perror_with_name (_("Couldn't get registers"));
  76
  77       regcache->supply_regset (&arm_fbsd_gregset, regnum, &regs,
  78                                sizeof (regs));
  79     }
  80
  81 #ifdef PT_GETVFPREGS
  82   if (regnum == -1 || getvfpregs_supplies (gdbarch, regnum))
  83     {
  84       struct vfpreg vfpregs;
  85
  86       if (ptrace (PT_GETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
  87         perror_with_name (_("Couldn't get floating point status"));
  88
  89       regcache->supply_regset (&arm_fbsd_vfpregset, regnum, &vfpregs,
  90                                sizeof (vfpregs));
  91     }
  92 #endif
  93 }
  94
  95 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  96    this for all registers.  */
  97
  98 void
  99 arm_fbsd_nat_target::store_registers (struct regcache *regcache, int regnum)
 100 {
 101   pid_t pid = get_ptrace_pid (regcache->ptid ());
 102
 103   struct gdbarch *gdbarch = regcache->arch ();
 104   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
 105     {
 106       struct reg regs;
 107
 108       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 109         perror_with_name (_("Couldn't get registers"));
 110
 111       regcache->collect_regset (&arm_fbsd_gregset, regnum, &regs,
 112                                sizeof (regs));
 113
 114       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 115         perror_with_name (_("Couldn't write registers"));
 116     }
 117
 118 #ifdef PT_GETVFPREGS
 119   if (regnum == -1 || getvfpregs_supplies (gdbarch, regnum))
 120     {
 121       struct vfpreg vfpregs;
 122
 123       if (ptrace (PT_GETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
 124         perror_with_name (_("Couldn't get floating point status"));
 125
 126       regcache->collect_regset (&arm_fbsd_vfpregset, regnum, &vfpregs,
 127                                 sizeof (vfpregs));
 128
 129       if (ptrace (PT_SETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
 130         perror_with_name (_("Couldn't write floating point status"));
 131     }
 132 #endif
 133 }
 134
 135 /* Implement the to_read_description method.  */
 136
 137 const struct target_desc *
 138 arm_fbsd_nat_target::read_description ()
 139 {
 140   const struct target_desc *desc;
 141
 142   desc = arm_fbsd_read_description_auxv (this);
 143   if (desc == NULL)
 144     desc = this->beneath ()->read_description ();
 145   return desc;
 146 }
 147
 148 void
 149 _initialize_arm_fbsd_nat (void)
 150 {
 151   add_inf_child_target (&the_arm_fbsd_nat_target);
 152 }