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| 1 /* Native-dependent code for GNU/Linux TILE-Gx. |
| 2 |
| 3 Copyright (C) 2012 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 } |
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