gdb/gdbserver/linux-tile-low.c

   1 /* GNU/Linux/TILE-Gx specific low level interface, GDBserver.
   2
   3    Copyright (C) 2012-2019 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 uint64_t tile_breakpoint = 0x400b3cae70166000ULL;
  72 #define tile_breakpoint_len 8
  73
  74 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
  75
  76 static const gdb_byte *
  77 tile_sw_breakpoint_from_kind (int kind, int *size)
  78 {
  79   *size = tile_breakpoint_len;
  80   return (const gdb_byte *) &tile_breakpoint;
  81 }
  82
  83 static int
  84 tile_breakpoint_at (CORE_ADDR where)
  85 {
  86   uint64_t insn;
  87
  88   (*the_target->read_memory) (where, (unsigned char *) &insn, 8);
  89   if (insn == tile_breakpoint)
  90     return 1;
  91
  92   /* If necessary, recognize more trap instructions here.  GDB only uses the
  93      one.  */
  94   return 0;
  95 }
  96
  97 static void
  98 tile_fill_gregset (struct regcache *regcache, void *buf)
  99 {
 100   int i;
 101
 102   for (i = 0; i < tile_num_regs; i++)
 103     if (tile_regmap[i] != -1)
 104       collect_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
 105 }
 106
 107 static void
 108 tile_store_gregset (struct regcache *regcache, const void *buf)
 109 {
 110   int i;
 111
 112   for (i = 0; i < tile_num_regs; i++)
 113     if (tile_regmap[i] != -1)
 114       supply_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
 115 }
 116
 117 static struct regset_info tile_regsets[] =
 118 {
 119   { PTRACE_GETREGS, PTRACE_SETREGS, 0, tile_num_regs * 8,
 120     GENERAL_REGS, tile_fill_gregset, tile_store_gregset },
 121   NULL_REGSET
 122 };
 123
 124 static struct regsets_info tile_regsets_info =
 125   {
 126     tile_regsets, /* regsets */
 127     0, /* num_regsets */
 128     NULL, /* disabled_regsets */
 129   };
 130
 131 static struct usrregs_info tile_usrregs_info =
 132   {
 133     tile_num_regs,
 134     tile_regmap,
 135   };
 136
 137 static struct regs_info regs_info =
 138   {
 139     NULL, /* regset_bitmap */
 140     &tile_usrregs_info,
 141     &tile_regsets_info,
 142   };
 143
 144 static const struct regs_info *
 145 tile_regs_info (void)
 146 {
 147   return &regs_info;
 148 }
 149
 150 static void
 151 tile_arch_setup (void)
 152 {
 153   int pid = pid_of (current_thread);
 154   unsigned int machine;
 155   int is_elf64 = linux_pid_exe_is_elf_64_file (pid, &machine);
 156
 157   if (sizeof (void *) == 4)
 158     if (is_elf64 > 0)
 159       error (_("Can't debug 64-bit process with 32-bit GDBserver"));
 160
 161   if (!is_elf64)
 162     current_process ()->tdesc = tdesc_tilegx32;
 163   else
 164     current_process ()->tdesc = tdesc_tilegx;
 165 }
 166
 167 /* Support for hardware single step.  */
 168
 169 static int
 170 tile_supports_hardware_single_step (void)
 171 {
 172   return 1;
 173 }
 174
 175
 176 struct linux_target_ops the_low_target =
 177 {
 178   tile_arch_setup,
 179   tile_regs_info,
 180   tile_cannot_fetch_register,
 181   tile_cannot_store_register,
 182   NULL,
 183   linux_get_pc_64bit,
 184   linux_set_pc_64bit,
 185   NULL, /* breakpoint_kind_from_pc */
 186   tile_sw_breakpoint_from_kind,
 187   NULL,
 188   0,
 189   tile_breakpoint_at,
 190   NULL, /* supports_z_point_type */
 191   NULL, /* insert_point */
 192   NULL, /* remove_point */
 193   NULL, /* stopped_by_watchpoint */
 194   NULL, /* stopped_data_address */
 195   NULL, /* collect_ptrace_register */
 196   NULL, /* supply_ptrace_register */
 197   NULL, /* siginfo_fixup */
 198   NULL, /* new_process */
 199   NULL, /* delete_process */
 200   NULL, /* new_thread */
 201   NULL, /* delete_thread */
 202   NULL, /* new_fork */
 203   NULL, /* prepare_to_resume */
 204   NULL, /* process_qsupported */
 205   NULL, /* supports_tracepoints */
 206   NULL, /* get_thread_area */
 207   NULL, /* install_fast_tracepoint_jump_pad */
 208   NULL, /* emit_ops */
 209   NULL, /* get_min_fast_tracepoint_insn_len */
 210   NULL, /* supports_range_stepping */
 211   NULL, /* breakpoint_kind_from_current_state */
 212   tile_supports_hardware_single_step,
 213 };
 214
 215 void
 216 initialize_low_arch (void)
 217 {
 218   init_registers_tilegx32();
 219   init_registers_tilegx();
 220
 221   initialize_regsets_info (&tile_regsets_info);
 222 }