gdb/gdbserver/linux-tile-low.c - gdb

Global variables defined

Functions defined

Macros defined

Source code

  1. /* GNU/Linux/TILE-Gx specific low level interface, GDBserver.

  3.    Copyright (C) 2012-2015 Free Software Foundation, Inc.

  5.    This file is part of GDB.

  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.

  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.

  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/>.  */

  20. #include "server.h"
  21. #include "linux-low.h"

  23. #include <arch/abi.h>
  24. #include <sys/ptrace.h>

  26. /* Defined in auto-generated file reg-tilegx.c.  */
  27. void init_registers_tilegx (void);
  28. extern const struct target_desc *tdesc_tilegx;

  30. /* Defined in auto-generated file reg-tilegx32.c.  */
  31. void init_registers_tilegx32 (void);
  32. extern const struct target_desc *tdesc_tilegx32;

  34. ‌#define tile_num_regs 65

  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. };

  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. }

  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. }

  71. static CORE_ADDR
  72. ‌tile_get_pc (struct regcache *regcache)
  73. {
  74.   unsigned long pc;

  76.   collect_register_by_name (regcache, "pc", &pc);
  77.   return pc;
  78. }

  80. static void
  81. ‌tile_set_pc (struct regcache *regcache, CORE_ADDR pc)
  82. {
  83.   unsigned long newpc = pc;

  85.   supply_register_by_name (regcache, "pc", &newpc);
  86. }

  88. ‌static uint64_t tile_breakpoint = 0x400b3cae70166000ULL;
  89. ‌#define tile_breakpoint_len 8

  91. static int
  92. ‌tile_breakpoint_at (CORE_ADDR where)
  93. {
  94.   uint64_t insn;

  96.   (*the_target->read_memory) (where, (unsigned char *) &insn, 8);
  97.   if (insn == tile_breakpoint)
  98.     return 1;

  100.   /* If necessary, recognize more trap instructions here.  GDB only uses the
  101.      one.  */
  102.   return 0;
  103. }

  105. static void
  106. ‌tile_fill_gregset (struct regcache *regcache, void *buf)
  107. {
  108.   int i;

  110.   for (i = 0; i < tile_num_regs; i++)
  111.     if (tile_regmap[i] != -1)
  112.       collect_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
  113. }

  115. static void
  116. ‌tile_store_gregset (struct regcache *regcache, const void *buf)
  117. {
  118.   int i;

  120.   for (i = 0; i < tile_num_regs; i++)
  121.     if (tile_regmap[i] != -1)
  122.       supply_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
  123. }

  125. ‌static struct regset_info tile_regsets[] =
  126. {
  127.   { PTRACE_GETREGS, PTRACE_SETREGS, 0, tile_num_regs * 8,
  128.     GENERAL_REGS, tile_fill_gregset, tile_store_gregset },
  129.   { 0, 0, 0, -1, -1, NULL, NULL }
  130. };

  132. ‌static struct regsets_info tile_regsets_info =
  133.   {
  134.     tile_regsets, /* regsets */
  135.     0, /* num_regsets */
  136.     NULL, /* disabled_regsets */
  137.   };

  139. ‌static struct usrregs_info tile_usrregs_info =
  140.   {
  141.     tile_num_regs,
  142.     tile_regmap,
  143.   };

  145. ‌static struct regs_info regs_info =
  146.   {
  147.     NULL, /* regset_bitmap */
  148.     &tile_usrregs_info,
  149.     &tile_regsets_info,
  150.   };

  152. static const struct regs_info *
  153. ‌tile_regs_info (void)
  154. {
  155.   return &regs_info;
  156. }

  158. static void
  159. ‌tile_arch_setup (void)
  160. {
  161.   int pid = pid_of (current_thread);
  162.   unsigned int machine;
  163.   int is_elf64 = linux_pid_exe_is_elf_64_file (pid, &machine);

  165.   if (sizeof (void *) == 4)
  166.     if (is_elf64 > 0)
  167.       error (_("Can't debug 64-bit process with 32-bit GDBserver"));

  169.   if (!is_elf64)
  170.     current_process ()->tdesc = tdesc_tilegx32;
  171.   else
  172.     current_process ()->tdesc = tdesc_tilegx;
  173. }


  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.   tile_get_pc,
  184.   tile_set_pc,
  185.   (const unsigned char *) &tile_breakpoint,
  186.   tile_breakpoint_len,
  187.   NULL,
  188.   0,
  189.   tile_breakpoint_at,
  190. };

  192. void
  193. ‌initialize_low_arch (void)
  194. {
  195.   init_registers_tilegx32();
  196.   init_registers_tilegx();

  198.   initialize_regsets_info (&tile_regsets_info);
  199. }