gdb/tilegx-linux-nat.c - gdb

Global variables defined

Functions defined

Source code

  1. /* Native-dependent code for GNU/Linux TILE-Gx.

  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 "defs.h"
  21. #include "inferior.h"
  22. #include "gdbcore.h"
  23. #include "regcache.h"
  24. #include "linux-nat.h"

  26. #include <sys/ptrace.h>

  28. #include <sys/procfs.h>

  30. /* Defines ps_err_e, struct ps_prochandle.  */
  31. #include "gdb_proc_service.h"

  33. /* Prototypes for supply_gregset etc.  */
  34. #include "gregset.h"

  36. /* The register sets used in GNU/Linux ELF core-dumps are identical to
  37.    the register sets in `struct user' that is used for a.out
  38.    core-dumps, and is also used by `ptrace'.  The corresponding types
  39.    are `elf_gregset_t' for the general-purpose registers (with
  40.    `elf_greg_t' the type of a single GP register) and `elf_fpregset_t'
  41.    for the floating-point registers.

  43.    Those types used to be available under the names `gregset_t' and
  44.    `fpregset_t' too, and this file used those names in the past.  But
  45.    those names are now used for the register sets used in the
  46.    `mcontext_t' type, and have a different size and layout.  */

  48. /* Mapping between the general-purpose registers in `struct user'
  49.    format and GDB's register array layout.  Note that we map the
  50.    first 56 registers (0 thru 55) one-to-one.  GDB maps the pc to
  51.    slot 64, but ptrace returns it in slot 56.  */
  52. ‌static const int regmap[] =
  53. {
  54.    0,  1,  2,  3,  4,  5,  6,  7,
  55.    8,  9, 10, 11, 12, 13, 14, 15,
  56.   16, 17, 18, 19, 20, 21, 22, 23,
  57.   24, 25, 26, 27, 28, 29, 30, 31,
  58.   32, 33, 34, 35, 36, 37, 38, 39,
  59.   40, 41, 42, 43, 44, 45, 46, 47,
  60.   48, 49, 50, 51, 52, 53, 54, 55,
  61.   -1, -1, -1, -1, -1, -1, -1, -1,
  62.   56, 58
  63. };

  65. /* Transfering the general-purpose registers between GDB, inferiors
  66.    and core files.  */

  68. /* Fill GDB's register array with the general-purpose register values
  69.    in *GREGSETP.  */

  71. void
  72. ‌supply_gregset (struct regcache* regcache,
  73.                 const elf_gregset_t *gregsetp)
  74. {
  75.   elf_greg_t *regp = (elf_greg_t *) gregsetp;
  76.   int i;

  78.   for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++)
  79.     if (regmap[i] >= 0)
  80.       regcache_raw_supply (regcache, i, regp + regmap[i]);
  81. }

  83. /* Fill registers in *GREGSETPS with the values in GDB's
  84.    register array.  */

  86. void
  87. ‌fill_gregset (const struct regcache* regcache,
  88.               elf_gregset_t *gregsetp, int regno)
  89. {
  90.   elf_greg_t *regp = (elf_greg_t *) gregsetp;
  91.   int i;

  93.   for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++)
  94.     if (regmap[i] >= 0)
  95.       regcache_raw_collect (regcache, i, regp + regmap[i]);
  96. }

  98. /* Transfering floating-point registers between GDB, inferiors and cores.  */

  100. /* Fill GDB's register array with the floating-point register values in
  101.    *FPREGSETP.  */

  103. void
  104. ‌supply_fpregset (struct regcache *regcache,
  105.                  const elf_fpregset_t *fpregsetp)
  106. {
  107.   /* NOTE: There are no floating-point registers for TILE-Gx.  */
  108. }

  110. /* Fill register REGNO (if it is a floating-point register) in
  111.    *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
  112.    do this for all registers.  */

  114. void
  115. ‌fill_fpregset (const struct regcache *regcache,
  116.                elf_fpregset_t *fpregsetp, int regno)
  117. {
  118.   /* NOTE: There are no floating-point registers for TILE-Gx.  */
  119. }

  121. /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  122.    for all registers.  */

  124. static void
  125. ‌fetch_inferior_registers (struct target_ops *ops,
  126.                           struct regcache *regcache, int regnum)
  127. {
  128.   elf_gregset_t regs;
  129.   int tid;

  131.   tid = ptid_get_lwp (inferior_ptid);
  132.   if (tid == 0)
  133.     tid = ptid_get_pid (inferior_ptid);

  135.   if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
  136.     perror_with_name (_("Couldn't get registers"));

  138.   supply_gregset (regcache, (const elf_gregset_t *)&regs);
  139. }

  141. /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  142.    this for all registers.  */

  144. static void
  145. ‌store_inferior_registers (struct target_ops *ops,
  146.                           struct regcache *regcache, int regnum)
  147. {
  148.   elf_gregset_t regs;
  149.   int tid;

  151.   tid = ptid_get_lwp (inferior_ptid);
  152.   if (tid == 0)
  153.     tid = ptid_get_pid (inferior_ptid);

  155.   if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
  156.     perror_with_name (_("Couldn't get registers"));

  158.   fill_gregset (regcache, &regs, regnum);

  160.   if (ptrace (PTRACE_SETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
  161.     perror_with_name (_("Couldn't write registers"));
  162. }


  165. extern initialize_file_ftype _initialize_tile_linux_nat;

  167. void
  168. ‌_initialize_tile_linux_nat (void)
  169. {
  170.   struct target_ops *t;

  172.   /* Fill in the generic GNU/Linux methods.  */
  173.   t = linux_target ();

  175.   /* Add our register access methods.  */
  176.   t->to_fetch_registers = fetch_inferior_registers;
  177.   t->to_store_registers = store_inferior_registers;

  179.   /* Register the target.  */
  180.   linux_nat_add_target (t);
  181. }