1 /* Native-dependent code for GNU/Linux TILE-Gx. 2 3 Copyright (C) 2012-2016 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 "nat/gdb_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) ®s) < 0) 136 perror_with_name (_("Couldn't get registers")); 137 138 supply_gregset (regcache, (const elf_gregset_t *)®s); 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) ®s) < 0) 156 perror_with_name (_("Couldn't get registers")); 157 158 fill_gregset (regcache, ®s, regnum); 159 160 if (ptrace (PTRACE_SETREGS, tid, 0, (PTRACE_TYPE_ARG3) ®s) < 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 } 182