gdb/gdbserver/linux-tile-low.c

   1 /* GNU/Linux/TILE-Gx specific low level interface, GDBserver.
   2
   3    Copyright (C) 2012-2013 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 <sys/ptrace.h>
  25
  26 /* Defined in auto-generated file reg-tilegx.c.  */
  27 void init_registers_tilegx (void);
  28 /* Defined in auto-generated file reg-tilegx32.c.  */
  29 void init_registers_tilegx32 (void);
  30
  31 #define tile_num_regs 65
  32
  33 static int tile_regmap[] =
  34 {
  35    0,  1,  2,  3,  4,  5,  6,  7,
  36    8,  9, 10, 11, 12, 13, 14, 15,
  37   16, 17, 18, 19, 20, 21, 22, 23,
  38   24, 25, 26, 27, 28, 29, 30, 31,
  39   32, 33, 34, 35, 36, 37, 38, 39,
  40   40, 41, 42, 43, 44, 45, 46, 47,
  41   48, 49, 50, 51, 52, 53, 54, 55,
  42   -1, -1, -1, -1, -1, -1, -1, -1,
  43   56
  44 };
  45
  46 static int
  47 tile_cannot_fetch_register (int regno)
  48 {
  49   if (regno >= 0 && regno < 56)
  50     return 0;
  51   else if (regno == 64)
  52     return 0;
  53   else
  54     return 1;
  55 }
  56
  57 static int
  58 tile_cannot_store_register (int regno)
  59 {
  60   if (regno >= 0 && regno < 56)
  61     return 0;
  62   else if (regno == 64)
  63     return 0;
  64   else
  65     return 1;
  66 }
  67
  68 static CORE_ADDR
  69 tile_get_pc (struct regcache *regcache)
  70 {
  71   unsigned long pc;
  72
  73   collect_register_by_name (regcache, "pc", &pc);
  74   return pc;
  75 }
  76
  77 static void
  78 tile_set_pc (struct regcache *regcache, CORE_ADDR pc)
  79 {
  80   unsigned long newpc = pc;
  81
  82   supply_register_by_name (regcache, "pc", &newpc);
  83 }
  84
  85 static uint64_t tile_breakpoint = 0x400b3cae70166000ULL;
  86 #define tile_breakpoint_len 8
  87
  88 static int
  89 tile_breakpoint_at (CORE_ADDR where)
  90 {
  91   uint64_t insn;
  92
  93   (*the_target->read_memory) (where, (unsigned char *) &insn, 8);
  94   if (insn == tile_breakpoint)
  95     return 1;
  96
  97   /* If necessary, recognize more trap instructions here.  GDB only uses the
  98      one.  */
  99   return 0;
 100 }
 101
 102 static void
 103 tile_fill_gregset (struct regcache *regcache, void *buf)
 104 {
 105   int i;
 106
 107   for (i = 0; i < tile_num_regs; i++)
 108     if (tile_regmap[i] != -1)
 109       collect_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
 110 }
 111
 112 static void
 113 tile_store_gregset (struct regcache *regcache, const void *buf)
 114 {
 115   int i;
 116
 117   for (i = 0; i < tile_num_regs; i++)
 118     if (tile_regmap[i] != -1)
 119       supply_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
 120 }
 121
 122 struct regset_info target_regsets[] =
 123 {
 124   { PTRACE_GETREGS, PTRACE_SETREGS, 0, tile_num_regs * 4,
 125     GENERAL_REGS, tile_fill_gregset, tile_store_gregset },
 126   { 0, 0, 0, -1, -1, NULL, NULL }
 127 };
 128
 129 static void
 130 tile_arch_setup (void)
 131 {
 132   int pid = pid_of (get_thread_lwp (current_inferior));
 133   unsigned int machine;
 134   int is_elf64 = linux_pid_exe_is_elf_64_file (pid, &machine);
 135
 136   if (sizeof (void *) == 4)
 137     if (is_elf64 > 0)
 138       error (_("Can't debug 64-bit process with 32-bit GDBserver"));
 139
 140   if (!is_elf64)
 141     init_registers_tilegx32();
 142   else
 143     init_registers_tilegx();
 144 }
 145
 146
 147 struct linux_target_ops the_low_target =
 148 {
 149   tile_arch_setup,
 150   tile_num_regs,
 151   tile_regmap,
 152   NULL,
 153   tile_cannot_fetch_register,
 154   tile_cannot_store_register,
 155   NULL,
 156   tile_get_pc,
 157   tile_set_pc,
 158   (const unsigned char *) &tile_breakpoint,
 159   tile_breakpoint_len,
 160   NULL,
 161   0,
 162   tile_breakpoint_at,
 163 };