gdb/arm-fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/arm.
   2
   3    Copyright (C) 2017 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 /* Determine if PT_GETREGS fetches REGNUM.  */
  33
  34 static bool
  35 getregs_supplies (struct gdbarch *gdbarch, int regnum)
  36 {
  37   return ((regnum >= ARM_A1_REGNUM && regnum <= ARM_PC_REGNUM)
  38           || regnum == ARM_PS_REGNUM);
  39 }
  40
  41 #ifdef PT_GETVFPREGS
  42 /* Determine if PT_GETVFPREGS fetches REGNUM.  */
  43
  44 static bool
  45 getvfpregs_supplies (struct gdbarch *gdbarch, int regnum)
  46 {
  47   return ((regnum >= ARM_D0_REGNUM && regnum <= ARM_D31_REGNUM)
  48           || regnum == ARM_FPSCR_REGNUM);
  49 }
  50 #endif
  51
  52 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  53    for all registers.  */
  54
  55 static void
  56 arm_fbsd_fetch_inferior_registers (struct target_ops *ops,
  57                                     struct regcache *regcache, int regnum)
  58 {
  59   pid_t pid = get_ptrace_pid (regcache_get_ptid (regcache));
  60
  61   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  62   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
  63     {
  64       struct reg regs;
  65
  66       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  67         perror_with_name (_("Couldn't get registers"));
  68
  69       regcache->supply_regset (&arm_fbsd_gregset, regnum, &regs,
  70                                sizeof (regs));
  71     }
  72
  73 #ifdef PT_GETVFPREGS
  74   if (regnum == -1 || getvfpregs_supplies (gdbarch, regnum))
  75     {
  76       struct vfpreg vfpregs;
  77
  78       if (ptrace (PT_GETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
  79         perror_with_name (_("Couldn't get floating point status"));
  80
  81       regcache->supply_regset (&arm_fbsd_vfpregset, regnum, &vfpregs,
  82                                sizeof (vfpregs));
  83     }
  84 #endif
  85 }
  86
  87 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  88    this for all registers.  */
  89
  90 static void
  91 arm_fbsd_store_inferior_registers (struct target_ops *ops,
  92                                     struct regcache *regcache, int regnum)
  93 {
  94   pid_t pid = get_ptrace_pid (regcache_get_ptid (regcache));
  95
  96   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  97   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
  98     {
  99       struct reg regs;
 100
 101       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 102         perror_with_name (_("Couldn't get registers"));
 103
 104       regcache->collect_regset (&arm_fbsd_gregset, regnum, &regs,
 105                                sizeof (regs));
 106
 107       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 108         perror_with_name (_("Couldn't write registers"));
 109     }
 110
 111 #ifdef PT_GETVFPREGS
 112   if (regnum == -1 || getvfpregs_supplies (gdbarch, regnum))
 113     {
 114       struct vfpreg vfpregs;
 115
 116       if (ptrace (PT_GETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
 117         perror_with_name (_("Couldn't get floating point status"));
 118
 119       regcache->collect_regset (&arm_fbsd_vfpregset, regnum, &vfpregs,
 120                                 sizeof (vfpregs));
 121
 122       if (ptrace (PT_SETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1)
 123         perror_with_name (_("Couldn't write floating point status"));
 124     }
 125 #endif
 126 }
 127
 128 /* Implement the to_read_description method.  */
 129
 130 static const struct target_desc *
 131 arm_fbsd_read_description (struct target_ops *ops)
 132 {
 133   const struct target_desc *desc;
 134
 135   desc = arm_fbsd_read_description_auxv (ops);
 136   if (desc == NULL)
 137     desc = ops->beneath->to_read_description (ops->beneath);
 138   return desc;
 139 }
 140
 141 void
 142 _initialize_arm_fbsd_nat (void)
 143 {
 144   struct target_ops *t;
 145
 146   t = inf_ptrace_target ();
 147   t->to_fetch_registers = arm_fbsd_fetch_inferior_registers;
 148   t->to_store_registers = arm_fbsd_store_inferior_registers;
 149   t->to_read_description = arm_fbsd_read_description;
 150   fbsd_nat_add_target (t);
 151 }