gdb/gdbserver/linux-tile-low.c

   1 /* GNU/Linux/TILE-Gx specific low level interface, GDBserver.
   2
   3    Copyright (C) 2012-2015 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 "server.h"
  21 #include "linux-low.h"
  22
  23 #include <arch/abi.h>
  24 #include "nat/gdb_ptrace.h"
  25
  26 /* Defined in auto-generated file reg-tilegx.c.  */
  27 void init_registers_tilegx (void);
  28 extern const struct target_desc *tdesc_tilegx;
  29
  30 /* Defined in auto-generated file reg-tilegx32.c.  */
  31 void init_registers_tilegx32 (void);
  32 extern const struct target_desc *tdesc_tilegx32;
  33
  34 #define tile_num_regs 65
  35
  36 static int tile_regmap[] =
  37 {
  38    0,  1,  2,  3,  4,  5,  6,  7,
  39    8,  9, 10, 11, 12, 13, 14, 15,
  40   16, 17, 18, 19, 20, 21, 22, 23,
  41   24, 25, 26, 27, 28, 29, 30, 31,
  42   32, 33, 34, 35, 36, 37, 38, 39,
  43   40, 41, 42, 43, 44, 45, 46, 47,
  44   48, 49, 50, 51, 52, 53, 54, 55,
  45   -1, -1, -1, -1, -1, -1, -1, -1,
  46   56
  47 };
  48
  49 static int
  50 tile_cannot_fetch_register (int regno)
  51 {
  52   if (regno >= 0 && regno < 56)
  53     return 0;
  54   else if (regno == 64)
  55     return 0;
  56   else
  57     return 1;
  58 }
  59
  60 static int
  61 tile_cannot_store_register (int regno)
  62 {
  63   if (regno >= 0 && regno < 56)
  64     return 0;
  65   else if (regno == 64)
  66     return 0;
  67   else
  68     return 1;
  69 }
  70
  71 static CORE_ADDR
  72 tile_get_pc (struct regcache *regcache)
  73 {
  74   unsigned long pc;
  75
  76   collect_register_by_name (regcache, "pc", &pc);
  77   return pc;
  78 }
  79
  80 static void
  81 tile_set_pc (struct regcache *regcache, CORE_ADDR pc)
  82 {
  83   unsigned long newpc = pc;
  84
  85   supply_register_by_name (regcache, "pc", &newpc);
  86 }
  87
  88 static uint64_t tile_breakpoint = 0x400b3cae70166000ULL;
  89 #define tile_breakpoint_len 8
  90
  91 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
  92
  93 static const gdb_byte *
  94 tile_sw_breakpoint_from_kind (int kind, int *size)
  95 {
  96   *size = tile_breakpoint_len;
  97   return (const gdb_byte *) &tile_breakpoint;
  98 }
  99
 100 static int
 101 tile_breakpoint_at (CORE_ADDR where)
 102 {
 103   uint64_t insn;
 104
 105   (*the_target->read_memory) (where, (unsigned char *) &insn, 8);
 106   if (insn == tile_breakpoint)
 107     return 1;
 108
 109   /* If necessary, recognize more trap instructions here.  GDB only uses the
 110      one.  */
 111   return 0;
 112 }
 113
 114 static void
 115 tile_fill_gregset (struct regcache *regcache, void *buf)
 116 {
 117   int i;
 118
 119   for (i = 0; i < tile_num_regs; i++)
 120     if (tile_regmap[i] != -1)
 121       collect_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
 122 }
 123
 124 static void
 125 tile_store_gregset (struct regcache *regcache, const void *buf)
 126 {
 127   int i;
 128
 129   for (i = 0; i < tile_num_regs; i++)
 130     if (tile_regmap[i] != -1)
 131       supply_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
 132 }
 133
 134 static struct regset_info tile_regsets[] =
 135 {
 136   { PTRACE_GETREGS, PTRACE_SETREGS, 0, tile_num_regs * 8,
 137     GENERAL_REGS, tile_fill_gregset, tile_store_gregset },
 138   NULL_REGSET
 139 };
 140
 141 static struct regsets_info tile_regsets_info =
 142   {
 143     tile_regsets, /* regsets */
 144     0, /* num_regsets */
 145     NULL, /* disabled_regsets */
 146   };
 147
 148 static struct usrregs_info tile_usrregs_info =
 149   {
 150     tile_num_regs,
 151     tile_regmap,
 152   };
 153
 154 static struct regs_info regs_info =
 155   {
 156     NULL, /* regset_bitmap */
 157     &tile_usrregs_info,
 158     &tile_regsets_info,
 159   };
 160
 161 static const struct regs_info *
 162 tile_regs_info (void)
 163 {
 164   return &regs_info;
 165 }
 166
 167 static void
 168 tile_arch_setup (void)
 169 {
 170   int pid = pid_of (current_thread);
 171   unsigned int machine;
 172   int is_elf64 = linux_pid_exe_is_elf_64_file (pid, &machine);
 173
 174   if (sizeof (void *) == 4)
 175     if (is_elf64 > 0)
 176       error (_("Can't debug 64-bit process with 32-bit GDBserver"));
 177
 178   if (!is_elf64)
 179     current_process ()->tdesc = tdesc_tilegx32;
 180   else
 181     current_process ()->tdesc = tdesc_tilegx;
 182 }
 183
 184
 185 struct linux_target_ops the_low_target =
 186 {
 187   tile_arch_setup,
 188   tile_regs_info,
 189   tile_cannot_fetch_register,
 190   tile_cannot_store_register,
 191   NULL,
 192   tile_get_pc,
 193   tile_set_pc,
 194   NULL, /* breakpoint_kind_from_pc */
 195   tile_sw_breakpoint_from_kind,
 196   NULL,
 197   0,
 198   tile_breakpoint_at,
 199 };
 200
 201 void
 202 initialize_low_arch (void)
 203 {
 204   init_registers_tilegx32();
 205   init_registers_tilegx();
 206
 207   initialize_regsets_info (&tile_regsets_info);
 208 }