gdbserver/netbsd-aarch64-low.cc

   1 /* Copyright (C) 2020-2022 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sys/types.h>
  19 #include <sys/ptrace.h>
  20 #include <limits.h>
  21
  22 #include "server.h"
  23 #include "netbsd-low.h"
  24 #include "arch/aarch64.h"
  25 #include "arch/aarch64-insn.h"
  26 #include "tdesc.h"
  27
  28 /* The fill_function for the general-purpose register set.  */
  29
  30 static void
  31 netbsd_aarch64_fill_gregset (struct regcache *regcache, char *buf)
  32 {
  33   struct reg *r = (struct reg *) buf;
  34
  35 #define netbsd_aarch64_collect_gp(regnum, fld) do {             \
  36     collect_register (regcache, regnum, &r->fld);               \
  37   } while (0)
  38
  39   for (size_t i = 0; i < ARRAY_SIZE (r->r_reg); i++)
  40     netbsd_aarch64_collect_gp (AARCH64_X0_REGNUM + i, r_reg[i]);
  41
  42   netbsd_aarch64_collect_gp (AARCH64_SP_REGNUM, r_sp);
  43   netbsd_aarch64_collect_gp (AARCH64_PC_REGNUM, r_pc);
  44 }
  45
  46 /* The store_function for the general-purpose register set.  */
  47
  48 static void
  49 netbsd_aarch64_store_gregset (struct regcache *regcache, const char *buf)
  50 {
  51   struct reg *r = (struct reg *) buf;
  52
  53 #define netbsd_aarch64_supply_gp(regnum, fld) do {              \
  54     supply_register (regcache, regnum, &r->fld);                \
  55   } while(0)
  56
  57   for (size_t i = 0; i < ARRAY_SIZE (r->r_reg); i++)
  58     netbsd_aarch64_supply_gp (AARCH64_X0_REGNUM + i, r_reg[i]);
  59
  60   netbsd_aarch64_supply_gp (AARCH64_SP_REGNUM, r_sp);
  61   netbsd_aarch64_supply_gp (AARCH64_PC_REGNUM, r_pc);
  62 }
  63
  64 /* Description of all the aarch64-netbsd register sets.  */
  65
  66 static const struct netbsd_regset_info netbsd_target_regsets[] =
  67 {
  68   /* General Purpose Registers.  */
  69   {PT_GETREGS, PT_SETREGS, sizeof (struct reg),
  70   netbsd_aarch64_fill_gregset, netbsd_aarch64_store_gregset},
  71   /* End of list marker.  */
  72   {0, 0, -1, NULL, NULL }
  73 };
  74
  75 /* NetBSD target op definitions for the aarch64 architecture.  */
  76
  77 class netbsd_aarch64_target : public netbsd_process_target
  78 {
  79 protected:
  80   const netbsd_regset_info *get_regs_info () override;
  81
  82   void low_arch_setup () override;
  83 };
  84
  85 /* Return the information to access registers.  */
  86
  87 const netbsd_regset_info *
  88 netbsd_aarch64_target::get_regs_info ()
  89 {
  90   return netbsd_target_regsets;
  91 }
  92
  93 /* Architecture-specific setup for the current process.  */
  94
  95 void
  96 netbsd_aarch64_target::low_arch_setup ()
  97 {
  98   target_desc *tdesc
  99     = aarch64_create_target_description ({});
 100
 101   static const char *expedite_regs_aarch64[] = { "x29", "sp", "pc", NULL };
 102   init_target_desc (tdesc, expedite_regs_aarch64);
 103
 104   current_process ()->tdesc = tdesc;
 105 }
 106
 107 /* The singleton target ops object.  */
 108
 109 static netbsd_aarch64_target the_netbsd_aarch64_target;
 110
 111 /* The NetBSD target ops object.  */
 112
 113 netbsd_process_target *the_netbsd_target = &the_netbsd_aarch64_target;