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