gdb/aarch64-fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/aarch64.
   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 "aarch64-fbsd-tdep.h"
  29 #include "aarch64-tdep.h"
  30 #include "fbsd-nat.h"
  31 #include "inf-ptrace.h"
  32 #include "target.h"
  33
  34 struct aarch64_fbsd_nat_target final : public fbsd_nat_target
  35 {
  36   void fetch_registers (struct regcache *, int) override;
  37   void store_registers (struct regcache *, int) override;
  38 };
  39
  40 static aarch64_fbsd_nat_target the_aarch64_fbsd_nat_target;
  41
  42 /* Determine if PT_GETREGS fetches REGNUM.  */
  43
  44 static bool
  45 getregs_supplies (struct gdbarch *gdbarch, int regnum)
  46 {
  47   return (regnum >= AARCH64_X0_REGNUM && regnum <= AARCH64_CPSR_REGNUM);
  48 }
  49
  50 /* Determine if PT_GETFPREGS fetches REGNUM.  */
  51
  52 static bool
  53 getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
  54 {
  55   return (regnum >= AARCH64_V0_REGNUM && regnum <= AARCH64_FPCR_REGNUM);
  56 }
  57
  58 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  59    for all registers.  */
  60
  61 void
  62 aarch64_fbsd_nat_target::fetch_registers (struct regcache *regcache,
  63                                           int regnum)
  64 {
  65   pid_t pid = get_ptrace_pid (regcache->ptid ());
  66
  67   struct gdbarch *gdbarch = regcache->arch ();
  68   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
  69     {
  70       struct reg regs;
  71
  72       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  73         perror_with_name (_("Couldn't get registers"));
  74
  75       regcache->supply_regset (&aarch64_fbsd_gregset, regnum, &regs,
  76                                sizeof (regs));
  77     }
  78
  79   if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
  80     {
  81       struct fpreg fpregs;
  82
  83       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  84         perror_with_name (_("Couldn't get floating point status"));
  85
  86       regcache->supply_regset (&aarch64_fbsd_fpregset, regnum, &fpregs,
  87                                sizeof (fpregs));
  88     }
  89 }
  90
  91 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  92    this for all registers.  */
  93
  94 void
  95 aarch64_fbsd_nat_target::store_registers (struct regcache *regcache,
  96                                           int regnum)
  97 {
  98   pid_t pid = get_ptrace_pid (regcache->ptid ());
  99
 100   struct gdbarch *gdbarch = regcache->arch ();
 101   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
 102     {
 103       struct reg regs;
 104
 105       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 106         perror_with_name (_("Couldn't get registers"));
 107
 108       regcache->collect_regset (&aarch64_fbsd_gregset, regnum, &regs,
 109                                sizeof (regs));
 110
 111       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 112         perror_with_name (_("Couldn't write registers"));
 113     }
 114
 115   if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
 116     {
 117       struct fpreg fpregs;
 118
 119       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 120         perror_with_name (_("Couldn't get floating point status"));
 121
 122       regcache->collect_regset (&aarch64_fbsd_fpregset, regnum, &fpregs,
 123                                 sizeof (fpregs));
 124
 125       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 126         perror_with_name (_("Couldn't write floating point status"));
 127     }
 128 }
 129
 130 void
 131 _initialize_aarch64_fbsd_nat (void)
 132 {
 133   add_inf_child_target (&the_aarch64_fbsd_nat_target);
 134 }