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
  22 /* Standard C includes.  */
  23 #include <machine/reg.h>
  24 #include <sys/ptrace.h>
  25 #include <sys/types.h>
  26
  27 /* Local non-gdb includes.  */
  28 #include "arm-fbsd-tdep.h"
  29 #include "arm-tdep.h"
  30 #include "fbsd-nat.h"
  31 #include "inf-ptrace.h"
  32 #include "target.h"
  33
  34 struct arm_fbsd_nat_target : public fbsd_nat_target
  35 {
  36   void fetch_registers (struct regcache *, int) override;
  37   void store_registers (struct regcache *, int) override;
  38   const struct target_desc *read_description () override;
  39 };
  40
  41 static arm_fbsd_nat_target the_arm_fbsd_nat_target;
  42
  43 /* Determine if PT_GETREGS fetches REGNUM.  */
  44
  45 static bool
  46 getregs_supplies (struct gdbarch *gdbarch, int regnum)
  47 {
  48   return ((regnum >= ARM_A1_REGNUM && regnum <= ARM_PC_REGNUM)
  49           || regnum == ARM_PS_REGNUM);
  50 }
  51
  52 #ifdef PT_GETVFPREGS
  53 /* Determine if PT_GETVFPREGS fetches REGNUM.  */
  54
  55 static bool
  56 getvfpregs_supplies (struct gdbarch *gdbarch, int regnum)
  57 {
  58   return ((regnum >= ARM_D0_REGNUM && regnum <= ARM_D31_REGNUM)
  59           || regnum == ARM_FPSCR_REGNUM);
  60 }
  61 #endif
  62
  63 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  64    for all registers.  */
  65
  66 void
  67 arm_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
  68 {
  69   pid_t pid = get_ptrace_pid (regcache->ptid ());
  70
  71   struct gdbarch *gdbarch = regcache->arch ();
  72   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
  73     {
  74       struct reg regs;
  75
  76       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  77         perror_with_name (_("Couldn't get registers"));
  78
  79       regcache->supply_regset (&arm_fbsd_gregset, regnum, &regs,
  80                                sizeof (regs));
  81     }
  82
  83 #ifdef PT_GETVFPREGS
  84   if (regnum == -1 || getvfpregs_supplies (gdbarch, regnum))
  85     {
  86       struct vfpreg vfpregs;
  87
  88       if (ptrace (PT_GETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
  89         perror_with_name (_("Couldn't get floating point status"));
  90
  91       regcache->supply_regset (&arm_fbsd_vfpregset, regnum, &vfpregs,
  92                                sizeof (vfpregs));
  93     }
  94 #endif
  95 }
  96
  97 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  98    this for all registers.  */
  99
 100 void
 101 arm_fbsd_nat_target::store_registers (struct regcache *regcache, int regnum)
 102 {
 103   pid_t pid = get_ptrace_pid (regcache->ptid ());
 104
 105   struct gdbarch *gdbarch = regcache->arch ();
 106   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
 107     {
 108       struct reg regs;
 109
 110       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 111         perror_with_name (_("Couldn't get registers"));
 112
 113       regcache->collect_regset (&arm_fbsd_gregset, regnum, &regs,
 114                                sizeof (regs));
 115
 116       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 117         perror_with_name (_("Couldn't write registers"));
 118     }
 119
 120 #ifdef PT_GETVFPREGS
 121   if (regnum == -1 || getvfpregs_supplies (gdbarch, regnum))
 122     {
 123       struct vfpreg vfpregs;
 124
 125       if (ptrace (PT_GETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
 126         perror_with_name (_("Couldn't get floating point status"));
 127
 128       regcache->collect_regset (&arm_fbsd_vfpregset, regnum, &vfpregs,
 129                                 sizeof (vfpregs));
 130
 131       if (ptrace (PT_SETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
 132         perror_with_name (_("Couldn't write floating point status"));
 133     }
 134 #endif
 135 }
 136
 137 /* Implement the to_read_description method.  */
 138
 139 const struct target_desc *
 140 arm_fbsd_nat_target::read_description ()
 141 {
 142   const struct target_desc *desc;
 143
 144   desc = arm_fbsd_read_description_auxv (this);
 145   if (desc == NULL)
 146     desc = this->beneath ()->read_description ();
 147   return desc;
 148 }
 149
 150 void
 151 _initialize_arm_fbsd_nat (void)
 152 {
 153   add_inf_child_target (&the_arm_fbsd_nat_target);
 154 }