1 /* Native-dependent code for GNU/Linux TILE-Gx. 2 3 Copyright (C) 2012-2017 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 #include "inf-ptrace.h" 26 27 #include "nat/gdb_ptrace.h" 28 29 #include <sys/procfs.h> 30 31 /* Defines ps_err_e, struct ps_prochandle. */ 32 #include "gdb_proc_service.h" 33 34 /* Prototypes for supply_gregset etc. */ 35 #include "gregset.h" 36 37 /* The register sets used in GNU/Linux ELF core-dumps are identical to 38 the register sets in `struct user' that is used for a.out 39 core-dumps, and is also used by `ptrace'. The corresponding types 40 are `elf_gregset_t' for the general-purpose registers (with 41 `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' 42 for the floating-point registers. 43 44 Those types used to be available under the names `gregset_t' and 45 `fpregset_t' too, and this file used those names in the past. But 46 those names are now used for the register sets used in the 47 `mcontext_t' type, and have a different size and layout. */ 48 49 /* Mapping between the general-purpose registers in `struct user' 50 format and GDB's register array layout. Note that we map the 51 first 56 registers (0 thru 55) one-to-one. GDB maps the pc to 52 slot 64, but ptrace returns it in slot 56. */ 53 static const int regmap[] = 54 { 55 0, 1, 2, 3, 4, 5, 6, 7, 56 8, 9, 10, 11, 12, 13, 14, 15, 57 16, 17, 18, 19, 20, 21, 22, 23, 58 24, 25, 26, 27, 28, 29, 30, 31, 59 32, 33, 34, 35, 36, 37, 38, 39, 60 40, 41, 42, 43, 44, 45, 46, 47, 61 48, 49, 50, 51, 52, 53, 54, 55, 62 -1, -1, -1, -1, -1, -1, -1, -1, 63 56, 58 64 }; 65 66 /* Transfering the general-purpose registers between GDB, inferiors 67 and core files. */ 68 69 /* Fill GDB's register array with the general-purpose register values 70 in *GREGSETP. */ 71 72 void 73 supply_gregset (struct regcache* regcache, 74 const elf_gregset_t *gregsetp) 75 { 76 elf_greg_t *regp = (elf_greg_t *) gregsetp; 77 int i; 78 79 for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++) 80 if (regmap[i] >= 0) 81 regcache_raw_supply (regcache, i, regp + regmap[i]); 82 } 83 84 /* Fill registers in *GREGSETPS with the values in GDB's 85 register array. */ 86 87 void 88 fill_gregset (const struct regcache* regcache, 89 elf_gregset_t *gregsetp, int regno) 90 { 91 elf_greg_t *regp = (elf_greg_t *) gregsetp; 92 int i; 93 94 for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++) 95 if (regmap[i] >= 0) 96 regcache_raw_collect (regcache, i, regp + regmap[i]); 97 } 98 99 /* Transfering floating-point registers between GDB, inferiors and cores. */ 100 101 /* Fill GDB's register array with the floating-point register values in 102 *FPREGSETP. */ 103 104 void 105 supply_fpregset (struct regcache *regcache, 106 const elf_fpregset_t *fpregsetp) 107 { 108 /* NOTE: There are no floating-point registers for TILE-Gx. */ 109 } 110 111 /* Fill register REGNO (if it is a floating-point register) in 112 *FPREGSETP with the value in GDB's register array. If REGNO is -1, 113 do this for all registers. */ 114 115 void 116 fill_fpregset (const struct regcache *regcache, 117 elf_fpregset_t *fpregsetp, int regno) 118 { 119 /* NOTE: There are no floating-point registers for TILE-Gx. */ 120 } 121 122 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this 123 for all registers. */ 124 125 static void 126 fetch_inferior_registers (struct target_ops *ops, 127 struct regcache *regcache, int regnum) 128 { 129 elf_gregset_t regs; 130 pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache)); 131 132 if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) ®s) < 0) 133 perror_with_name (_("Couldn't get registers")); 134 135 supply_gregset (regcache, (const elf_gregset_t *)®s); 136 } 137 138 /* Store register REGNUM back into the inferior. If REGNUM is -1, do 139 this for all registers. */ 140 141 static void 142 store_inferior_registers (struct target_ops *ops, 143 struct regcache *regcache, int regnum) 144 { 145 elf_gregset_t regs; 146 pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache)); 147 148 if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) ®s) < 0) 149 perror_with_name (_("Couldn't get registers")); 150 151 fill_gregset (regcache, ®s, regnum); 152 153 if (ptrace (PTRACE_SETREGS, tid, 0, (PTRACE_TYPE_ARG3) ®s) < 0) 154 perror_with_name (_("Couldn't write registers")); 155 } 156 157 158 extern initialize_file_ftype _initialize_tile_linux_nat; 159 160 void 161 _initialize_tile_linux_nat (void) 162 { 163 struct target_ops *t; 164 165 /* Fill in the generic GNU/Linux methods. */ 166 t = linux_target (); 167 168 /* Add our register access methods. */ 169 t->to_fetch_registers = fetch_inferior_registers; 170 t->to_store_registers = store_inferior_registers; 171 172 /* Register the target. */ 173 linux_nat_add_target (t); 174 } 175