gdb/arm-fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/arm.
   2
   3    Copyright (C) 2017-2019 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 "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 (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 (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   if (regnum == -1 || getregs_supplies (regnum))
  70     {
  71       struct reg regs;
  72
  73       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  74         perror_with_name (_("Couldn't get registers"));
  75
  76       regcache->supply_regset (&arm_fbsd_gregset, regnum, &regs,
  77                                sizeof (regs));
  78     }
  79
  80 #ifdef PT_GETVFPREGS
  81   if (regnum == -1 || getvfpregs_supplies (regnum))
  82     {
  83       struct vfpreg vfpregs;
  84
  85       if (ptrace (PT_GETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
  86         perror_with_name (_("Couldn't get floating point status"));
  87
  88       regcache->supply_regset (&arm_fbsd_vfpregset, regnum, &vfpregs,
  89                                sizeof (vfpregs));
  90     }
  91 #endif
  92 }
  93
  94 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  95    this for all registers.  */
  96
  97 void
  98 arm_fbsd_nat_target::store_registers (struct regcache *regcache, int regnum)
  99 {
 100   pid_t pid = get_ptrace_pid (regcache->ptid ());
 101
 102   if (regnum == -1 || getregs_supplies (regnum))
 103     {
 104       struct reg regs;
 105
 106       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 107         perror_with_name (_("Couldn't get registers"));
 108
 109       regcache->collect_regset (&arm_fbsd_gregset, regnum, &regs,
 110                                sizeof (regs));
 111
 112       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 113         perror_with_name (_("Couldn't write registers"));
 114     }
 115
 116 #ifdef PT_GETVFPREGS
 117   if (regnum == -1 || getvfpregs_supplies (regnum))
 118     {
 119       struct vfpreg vfpregs;
 120
 121       if (ptrace (PT_GETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
 122         perror_with_name (_("Couldn't get floating point status"));
 123
 124       regcache->collect_regset (&arm_fbsd_vfpregset, regnum, &vfpregs,
 125                                 sizeof (vfpregs));
 126
 127       if (ptrace (PT_SETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
 128         perror_with_name (_("Couldn't write floating point status"));
 129     }
 130 #endif
 131 }
 132
 133 /* Implement the to_read_description method.  */
 134
 135 const struct target_desc *
 136 arm_fbsd_nat_target::read_description ()
 137 {
 138   const struct target_desc *desc;
 139
 140   desc = arm_fbsd_read_description_auxv (this);
 141   if (desc == NULL)
 142     desc = this->beneath ()->read_description ();
 143   return desc;
 144 }
 145
 146 void
 147 _initialize_arm_fbsd_nat (void)
 148 {
 149   add_inf_child_target (&the_arm_fbsd_nat_target);
 150 }