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