gdb/arm-fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/arm.
   2
   3    Copyright (C) 2017-2022 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 "inferior.h"
  22 #include "target.h"
  23
  24 #include "elf/common.h"
  25
  26 #include <sys/types.h>
  27 #include <sys/ptrace.h>
  28 #include <machine/reg.h>
  29
  30 #include "fbsd-nat.h"
  31 #include "arm-tdep.h"
  32 #include "arm-fbsd-tdep.h"
  33 #include "inf-ptrace.h"
  34
  35 struct arm_fbsd_nat_target : public fbsd_nat_target
  36 {
  37   void fetch_registers (struct regcache *, int) override;
  38   void store_registers (struct regcache *, int) override;
  39   const struct target_desc *read_description () override;
  40 };
  41
  42 static arm_fbsd_nat_target the_arm_fbsd_nat_target;
  43
  44 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  45    for all registers.  */
  46
  47 void
  48 arm_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
  49 {
  50   fetch_register_set<struct reg> (regcache, regnum, PT_GETREGS,
  51                                   &arm_fbsd_gregset);
  52 #ifdef PT_GETVFPREGS
  53   fetch_register_set<struct vfpreg> (regcache, regnum, PT_GETVFPREGS,
  54                                      &arm_fbsd_vfpregset);
  55 #endif
  56 #ifdef PT_GETREGSET
  57   gdbarch *gdbarch = regcache->arch ();
  58   arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (gdbarch);
  59
  60   if (tdep->tls_regnum > 0)
  61     {
  62       const struct regcache_map_entry arm_fbsd_tlsregmap[] =
  63         {
  64           { 1, tdep->tls_regnum, 4 },
  65           { 0 }
  66         };
  67
  68       const struct regset arm_fbsd_tlsregset =
  69         {
  70           arm_fbsd_tlsregmap,
  71           regcache_supply_regset, regcache_collect_regset
  72         };
  73
  74       fetch_regset<uint32_t> (regcache, regnum, NT_ARM_TLS, &arm_fbsd_tlsregset);
  75     }
  76 #endif
  77 }
  78
  79 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  80    this for all registers.  */
  81
  82 void
  83 arm_fbsd_nat_target::store_registers (struct regcache *regcache, int regnum)
  84 {
  85   store_register_set<struct reg> (regcache, regnum, PT_GETREGS, PT_SETREGS,
  86                                   &arm_fbsd_gregset);
  87 #ifdef PT_GETVFPREGS
  88   store_register_set<struct vfpreg> (regcache, regnum, PT_GETVFPREGS,
  89                                      PT_SETVFPREGS, &arm_fbsd_vfpregset);
  90 #endif
  91 #ifdef PT_GETREGSET
  92   gdbarch *gdbarch = regcache->arch ();
  93   arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (gdbarch);
  94
  95   if (tdep->tls_regnum > 0)
  96     {
  97       const struct regcache_map_entry arm_fbsd_tlsregmap[] =
  98         {
  99           { 1, tdep->tls_regnum, 4 },
 100           { 0 }
 101         };
 102
 103       const struct regset arm_fbsd_tlsregset =
 104         {
 105           arm_fbsd_tlsregmap,
 106           regcache_supply_regset, regcache_collect_regset
 107         };
 108
 109       store_regset<uint32_t> (regcache, regnum, NT_ARM_TLS, &arm_fbsd_tlsregset);
 110     }
 111 #endif
 112 }
 113
 114 /* Implement the to_read_description method.  */
 115
 116 const struct target_desc *
 117 arm_fbsd_nat_target::read_description ()
 118 {
 119   const struct target_desc *desc;
 120   bool tls = false;
 121
 122 #ifdef PT_GETREGSET
 123   tls = have_regset (inferior_ptid, NT_ARM_TLS) != 0;
 124 #endif
 125   desc = arm_fbsd_read_description_auxv (this, tls);
 126   if (desc == NULL)
 127     desc = this->beneath ()->read_description ();
 128   return desc;
 129 }
 130
 131 void _initialize_arm_fbsd_nat ();
 132 void
 133 _initialize_arm_fbsd_nat ()
 134 {
 135   add_inf_child_target (&the_arm_fbsd_nat_target);
 136 }