gdb/tilegx-linux-nat.c

   1 /* Native-dependent code for GNU/Linux TILE-Gx.
   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 "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 "gdb_assert.h"
  29 #include "gdb_string.h"
  30
  31 #include <sys/procfs.h>
  32
  33 #include "gdb_proc_service.h"
  34 #include <sys/ptrace.h>
  35
  36 /* Prototypes for supply_gregset etc.  */
  37 #include "gregset.h"
  38
  39 /* Defines ps_err_e, struct ps_prochandle.  */
  40 #include "gdb_proc_service.h"
  41
  42 /* The register sets used in GNU/Linux ELF core-dumps are identical to
  43    the register sets in `struct user' that is used for a.out
  44    core-dumps, and is also used by `ptrace'.  The corresponding types
  45    are `elf_gregset_t' for the general-purpose registers (with
  46    `elf_greg_t' the type of a single GP register) and `elf_fpregset_t'
  47    for the floating-point registers.
  48
  49    Those types used to be available under the names `gregset_t' and
  50    `fpregset_t' too, and this file used those names in the past.  But
  51    those names are now used for the register sets used in the
  52    `mcontext_t' type, and have a different size and layout.  */
  53
  54 /* Mapping between the general-purpose registers in `struct user'
  55    format and GDB's register array layout.  Note that we map the
  56    first 56 registers (0 thru 55) one-to-one.  GDB maps the pc to
  57    slot 64, but ptrace returns it in slot 56.  */
  58 static const int regmap[] =
  59 {
  60    0,  1,  2,  3,  4,  5,  6,  7,
  61    8,  9, 10, 11, 12, 13, 14, 15,
  62   16, 17, 18, 19, 20, 21, 22, 23,
  63   24, 25, 26, 27, 28, 29, 30, 31,
  64   32, 33, 34, 35, 36, 37, 38, 39,
  65   40, 41, 42, 43, 44, 45, 46, 47,
  66   48, 49, 50, 51, 52, 53, 54, 55,
  67   -1, -1, -1, -1, -1, -1, -1, -1,
  68   56, 58
  69 };
  70
  71 /* Transfering the general-purpose registers between GDB, inferiors
  72    and core files.  */
  73
  74 /* Fill GDB's register array with the general-purpose register values
  75    in *GREGSETP.  */
  76
  77 void
  78 supply_gregset (struct regcache* regcache,
  79                 const elf_gregset_t *gregsetp)
  80 {
  81   elf_greg_t *regp = (elf_greg_t *) gregsetp;
  82   int i;
  83
  84   for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++)
  85     if (regmap[i] >= 0)
  86       regcache_raw_supply (regcache, i, regp + regmap[i]);
  87 }
  88
  89 /* Fill registers in *GREGSETPS with the values in GDB's
  90    register array.  */
  91
  92 void
  93 fill_gregset (const struct regcache* regcache,
  94               elf_gregset_t *gregsetp, int regno)
  95 {
  96   elf_greg_t *regp = (elf_greg_t *) gregsetp;
  97   int i;
  98
  99   for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++)
 100     if (regmap[i] >= 0)
 101       regcache_raw_collect (regcache, i, regp + regmap[i]);
 102 }
 103
 104 /* Transfering floating-point registers between GDB, inferiors and cores.  */
 105
 106 /* Fill GDB's register array with the floating-point register values in
 107    *FPREGSETP.  */
 108
 109 void
 110 supply_fpregset (struct regcache *regcache,
 111                  const elf_fpregset_t *fpregsetp)
 112 {
 113   /* NOTE: There are no floating-point registers for TILE-Gx.  */
 114 }
 115
 116 /* Fill register REGNO (if it is a floating-point register) in
 117    *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
 118    do this for all registers.  */
 119
 120 void
 121 fill_fpregset (const struct regcache *regcache,
 122                elf_fpregset_t *fpregsetp, int regno)
 123 {
 124   /* NOTE: There are no floating-point registers for TILE-Gx.  */
 125 }
 126
 127 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
 128    for all registers.  */
 129
 130 static void
 131 fetch_inferior_registers (struct target_ops *ops,
 132                           struct regcache *regcache, int regnum)
 133 {
 134   elf_gregset_t regs;
 135   int tid;
 136
 137   tid = ptid_get_lwp (inferior_ptid);
 138   if (tid == 0)
 139     tid = ptid_get_pid (inferior_ptid);
 140
 141   if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
 142     perror_with_name (_("Couldn't get registers"));
 143
 144   supply_gregset (regcache, (const elf_gregset_t *)&regs);
 145 }
 146
 147 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 148    this for all registers.  */
 149
 150 static void
 151 store_inferior_registers (struct target_ops *ops,
 152                           struct regcache *regcache, int regnum)
 153 {
 154   elf_gregset_t regs;
 155   int tid;
 156
 157   tid = ptid_get_lwp (inferior_ptid);
 158   if (tid == 0)
 159     tid = ptid_get_pid (inferior_ptid);
 160
 161   if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
 162     perror_with_name (_("Couldn't get registers"));
 163
 164   fill_gregset (regcache, &regs, regnum);
 165
 166   if (ptrace (PTRACE_SETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
 167     perror_with_name (_("Couldn't write registers"));
 168 }
 169
 170
 171 extern initialize_file_ftype _initialize_tile_linux_nat;
 172
 173 void
 174 _initialize_tile_linux_nat (void)
 175 {
 176   struct target_ops *t;
 177
 178   /* Fill in the generic GNU/Linux methods.  */
 179   t = linux_target ();
 180
 181   /* Add our register access methods.  */
 182   t->to_fetch_registers = fetch_inferior_registers;
 183   t->to_store_registers = store_inferior_registers;
 184
 185   /* Register the target.  */
 186   linux_nat_add_target (t);
 187 }