gdb/aarch64-fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/aarch64.
   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 "aarch64-tdep.h"
  29 #include "aarch64-fbsd-tdep.h"
  30 #include "inf-ptrace.h"
  31
  32 /* Determine if PT_GETREGS fetches REGNUM.  */
  33
  34 static bool
  35 getregs_supplies (struct gdbarch *gdbarch, int regnum)
  36 {
  37   return (regnum >= AARCH64_X0_REGNUM && regnum <= AARCH64_CPSR_REGNUM);
  38 }
  39
  40 /* Determine if PT_GETFPREGS fetches REGNUM.  */
  41
  42 static bool
  43 getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
  44 {
  45   return (regnum >= AARCH64_V0_REGNUM && regnum <= AARCH64_FPCR_REGNUM);
  46 }
  47
  48 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  49    for all registers.  */
  50
  51 static void
  52 aarch64_fbsd_fetch_inferior_registers (struct target_ops *ops,
  53                                     struct regcache *regcache, int regnum)
  54 {
  55   pid_t pid = get_ptrace_pid (regcache_get_ptid (regcache));
  56
  57   struct gdbarch *gdbarch = regcache->arch ();
  58   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
  59     {
  60       struct reg regs;
  61
  62       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  63         perror_with_name (_("Couldn't get registers"));
  64
  65       regcache->supply_regset (&aarch64_fbsd_gregset, regnum, &regs,
  66                                sizeof (regs));
  67     }
  68
  69   if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
  70     {
  71       struct fpreg fpregs;
  72
  73       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  74         perror_with_name (_("Couldn't get floating point status"));
  75
  76       regcache->supply_regset (&aarch64_fbsd_fpregset, regnum, &fpregs,
  77                                sizeof (fpregs));
  78     }
  79 }
  80
  81 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  82    this for all registers.  */
  83
  84 static void
  85 aarch64_fbsd_store_inferior_registers (struct target_ops *ops,
  86                                     struct regcache *regcache, int regnum)
  87 {
  88   pid_t pid = get_ptrace_pid (regcache_get_ptid (regcache));
  89
  90   struct gdbarch *gdbarch = regcache->arch ();
  91   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
  92     {
  93       struct reg regs;
  94
  95       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  96         perror_with_name (_("Couldn't get registers"));
  97
  98       regcache->collect_regset (&aarch64_fbsd_gregset, regnum, &regs,
  99                                sizeof (regs));
 100
 101       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 102         perror_with_name (_("Couldn't write registers"));
 103     }
 104
 105   if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
 106     {
 107       struct fpreg fpregs;
 108
 109       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 110         perror_with_name (_("Couldn't get floating point status"));
 111
 112       regcache->collect_regset (&aarch64_fbsd_fpregset, regnum, &fpregs,
 113                                 sizeof (fpregs));
 114
 115       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 116         perror_with_name (_("Couldn't write floating point status"));
 117     }
 118 }
 119
 120 void
 121 _initialize_aarch64_fbsd_nat (void)
 122 {
 123   struct target_ops *t;
 124
 125   t = inf_ptrace_target ();
 126   t->to_fetch_registers = aarch64_fbsd_fetch_inferior_registers;
 127   t->to_store_registers = aarch64_fbsd_store_inferior_registers;
 128   fbsd_nat_add_target (t);
 129 }