| 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 |
| 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) ®s) < 0) |
| 142 | perror_with_name (_("Couldn't get registers")); |
| 143 | |
| 144 | supply_gregset (regcache, (const elf_gregset_t *)®s); |
| 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) ®s) < 0) |
| 162 | perror_with_name (_("Couldn't get registers")); |
| 163 | |
| 164 | fill_gregset (regcache, ®s, regnum); |
| 165 | |
| 166 | if (ptrace (PTRACE_SETREGS, tid, 0, (PTRACE_TYPE_ARG3) ®s) < 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 | } |