gdb/tilegx-linux-nat.c

   1 /* Native-dependent code for GNU/Linux TILE-Gx.
   2
   3    Copyright (C) 2012-2015 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 <sys/procfs.h>
  29
  30 /* Defines ps_err_e, struct ps_prochandle.  */
  31 #include "gdb_proc_service.h"
  32
  33 /* Prototypes for supply_gregset etc.  */
  34 #include "gregset.h"
  35
  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.
  42
  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.  */
  47
  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 };
  64
  65 /* Transfering the general-purpose registers between GDB, inferiors
  66    and core files.  */
  67
  68 /* Fill GDB's register array with the general-purpose register values
  69    in *GREGSETP.  */
  70
  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;
  77
  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 }
  82
  83 /* Fill registers in *GREGSETPS with the values in GDB's
  84    register array.  */
  85
  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;
  92
  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 }
  97
  98 /* Transfering floating-point registers between GDB, inferiors and cores.  */
  99
 100 /* Fill GDB's register array with the floating-point register values in
 101    *FPREGSETP.  */
 102
 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 }
 109
 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.  */
 113
 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 }
 120
 121 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
 122    for all registers.  */
 123
 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;
 130
 131   tid = ptid_get_lwp (inferior_ptid);
 132   if (tid == 0)
 133     tid = ptid_get_pid (inferior_ptid);
 134
 135   if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
 136     perror_with_name (_("Couldn't get registers"));
 137
 138   supply_gregset (regcache, (const elf_gregset_t *)&regs);
 139 }
 140
 141 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 142    this for all registers.  */
 143
 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;
 150
 151   tid = ptid_get_lwp (inferior_ptid);
 152   if (tid == 0)
 153     tid = ptid_get_pid (inferior_ptid);
 154
 155   if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
 156     perror_with_name (_("Couldn't get registers"));
 157
 158   fill_gregset (regcache, &regs, regnum);
 159
 160   if (ptrace (PTRACE_SETREGS, tid, 0, (PTRACE_TYPE_ARG3) &regs) < 0)
 161     perror_with_name (_("Couldn't write registers"));
 162 }
 163
 164
 165 extern initialize_file_ftype _initialize_tile_linux_nat;
 166
 167 void
 168 _initialize_tile_linux_nat (void)
 169 {
 170   struct target_ops *t;
 171
 172   /* Fill in the generic GNU/Linux methods.  */
 173   t = linux_target ();
 174
 175   /* Add our register access methods.  */
 176   t->to_fetch_registers = fetch_inferior_registers;
 177   t->to_store_registers = store_inferior_registers;
 178
 179   /* Register the target.  */
 180   linux_nat_add_target (t);
 181 }