gdb/tilegx-linux-nat.c

   1 /* Native-dependent code for GNU/Linux TILE-Gx.
   2
   3    Copyright (C) 2012-2014 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 "defs.h"
  21 #include "inferior.h"
  22 #include "gdbcore.h"
  23 #include "regcache.h"
  24 #include "linux-nat.h"
  25
  26 #include <sys/ptrace.h>
  27
  28 #include <string.h>
  29
  30 #include <sys/procfs.h>
  31
  32 /* Defines ps_err_e, struct ps_prochandle.  */
  33 #include "gdb_proc_service.h"
  34
  35 /* Prototypes for supply_gregset etc.  */
  36 #include "gregset.h"
  37
  38 /* The register sets used in GNU/Linux ELF core-dumps are identical to
  39    the register sets in `struct user' that is used for a.out
  40    core-dumps, and is also used by `ptrace'.  The corresponding types
  41    are `elf_gregset_t' for the general-purpose registers (with
  42    `elf_greg_t' the type of a single GP register) and `elf_fpregset_t'
  43    for the floating-point registers.
  44
  45    Those types used to be available under the names `gregset_t' and
  46    `fpregset_t' too, and this file used those names in the past.  But
  47    those names are now used for the register sets used in the
  48    `mcontext_t' type, and have a different size and layout.  */
  49
  50 /* Mapping between the general-purpose registers in `struct user'
  51    format and GDB's register array layout.  Note that we map the
  52    first 56 registers (0 thru 55) one-to-one.  GDB maps the pc to
  53    slot 64, but ptrace returns it in slot 56.  */
  54 static const int regmap[] =
  55 {
  56    0,  1,  2,  3,  4,  5,  6,  7,
  57    8,  9, 10, 11, 12, 13, 14, 15,
  58   16, 17, 18, 19, 20, 21, 22, 23,
  59   24, 25, 26, 27, 28, 29, 30, 31,
  60   32, 33, 34, 35, 36, 37, 38, 39,
  61   40, 41, 42, 43, 44, 45, 46, 47,
  62   48, 49, 50, 51, 52, 53, 54, 55,
  63   -1, -1, -1, -1, -1, -1, -1, -1,
  64   56, 58
  65 };
  66
  67 /* Transfering the general-purpose registers between GDB, inferiors
  68    and core files.  */
  69
  70 /* Fill GDB's register array with the general-purpose register values
  71    in *GREGSETP.  */
  72
  73 void
  74 supply_gregset (struct regcache* regcache,
  75                 const elf_gregset_t *gregsetp)
  76 {
  77   elf_greg_t *regp = (elf_greg_t *) gregsetp;
  78   int i;
  79
  80   for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++)
  81     if (regmap[i] >= 0)
  82       regcache_raw_supply (regcache, i, regp + regmap[i]);
  83 }
  84
  85 /* Fill registers in *GREGSETPS with the values in GDB's
  86    register array.  */
  87
  88 void
  89 fill_gregset (const struct regcache* regcache,
  90               elf_gregset_t *gregsetp, int regno)
  91 {
  92   elf_greg_t *regp = (elf_greg_t *) gregsetp;
  93   int i;
  94
  95   for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++)
  96     if (regmap[i] >= 0)
  97       regcache_raw_collect (regcache, i, regp + regmap[i]);
  98 }
  99
 100 /* Transfering floating-point registers between GDB, inferiors and cores.  */
 101
 102 /* Fill GDB's register array with the floating-point register values in
 103    *FPREGSETP.  */
 104
 105 void
 106 supply_fpregset (struct regcache *regcache,
 107                  const elf_fpregset_t *fpregsetp)
 108 {
 109   /* NOTE: There are no floating-point registers for TILE-Gx.  */
 110 }
 111
 112 /* Fill register REGNO (if it is a floating-point register) in
 113    *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
 114    do this for all registers.  */
 115
 116 void
 117 fill_fpregset (const struct regcache *regcache,
 118                elf_fpregset_t *fpregsetp, int regno)
 119 {
 120   /* NOTE: There are no floating-point registers for TILE-Gx.  */
 121 }
 122
 123 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
 124    for all registers.  */
 125
 126 static void
 127 fetch_inferior_registers (struct target_ops *ops,
 128                           struct regcache *regcache, int regnum)
 129 {
 130   elf_gregset_t regs;
 131   int tid;
 132
 133   tid = ptid_get_lwp (inferior_ptid);
 134   if (tid == 0)
 135     tid = ptid_get_pid (inferior_ptid);
 136
 137   if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
 138     perror_with_name (_("Couldn't get registers"));
 139
 140   supply_gregset (regcache, (const elf_gregset_t *)&regs);
 141 }
 142
 143 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 144    this for all registers.  */
 145
 146 static void
 147 store_inferior_registers (struct target_ops *ops,
 148                           struct regcache *regcache, int regnum)
 149 {
 150   elf_gregset_t regs;
 151   int tid;
 152
 153   tid = ptid_get_lwp (inferior_ptid);
 154   if (tid == 0)
 155     tid = ptid_get_pid (inferior_ptid);
 156
 157   if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
 158     perror_with_name (_("Couldn't get registers"));
 159
 160   fill_gregset (regcache, &regs, regnum);
 161
 162   if (ptrace (PTRACE_SETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
 163     perror_with_name (_("Couldn't write registers"));
 164 }
 165
 166
 167 extern initialize_file_ftype _initialize_tile_linux_nat;
 168
 169 void
 170 _initialize_tile_linux_nat (void)
 171 {
 172   struct target_ops *t;
 173
 174   /* Fill in the generic GNU/Linux methods.  */
 175   t = linux_target ();
 176
 177   /* Add our register access methods.  */
 178   t->to_fetch_registers = fetch_inferior_registers;
 179   t->to_store_registers = store_inferior_registers;
 180
 181   /* Register the target.  */
 182   linux_nat_add_target (t);
 183 }