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) ®s) < 0) 139 perror_with_name (_("Couldn't get registers")); 140 141 supply_gregset (regcache, (const elf_gregset_t *)®s); 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) ®s) < 0) 159 perror_with_name (_("Couldn't get registers")); 160 161 fill_gregset (regcache, ®s, regnum); 162 163 if (ptrace (PTRACE_SETREGS, tid, 0, (PTRACE_TYPE_ARG3) ®s) < 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 } 185