1 /* Native-dependent code for GNU/Linux TILE-Gx. 2 3 Copyright (C) 2012-2019 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 class tilegx_linux_nat_target final : public linux_nat_target 38 { 39 public: 40 /* Add our register access methods. */ 41 void fetch_registers (struct regcache *, int) override; 42 void store_registers (struct regcache *, int) override; 43 }; 44 45 static tilegx_linux_nat_target the_tilegx_linux_nat_target; 46 47 /* The register sets used in GNU/Linux ELF core-dumps are identical to 48 the register sets in `struct user' that is used for a.out 49 core-dumps, and is also used by `ptrace'. The corresponding types 50 are `elf_gregset_t' for the general-purpose registers (with 51 `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' 52 for the floating-point registers. 53 54 Those types used to be available under the names `gregset_t' and 55 `fpregset_t' too, and this file used those names in the past. But 56 those names are now used for the register sets used in the 57 `mcontext_t' type, and have a different size and layout. */ 58 59 /* Mapping between the general-purpose registers in `struct user' 60 format and GDB's register array layout. Note that we map the 61 first 56 registers (0 thru 55) one-to-one. GDB maps the pc to 62 slot 64, but ptrace returns it in slot 56. */ 63 static const int regmap[] = 64 { 65 0, 1, 2, 3, 4, 5, 6, 7, 66 8, 9, 10, 11, 12, 13, 14, 15, 67 16, 17, 18, 19, 20, 21, 22, 23, 68 24, 25, 26, 27, 28, 29, 30, 31, 69 32, 33, 34, 35, 36, 37, 38, 39, 70 40, 41, 42, 43, 44, 45, 46, 47, 71 48, 49, 50, 51, 52, 53, 54, 55, 72 -1, -1, -1, -1, -1, -1, -1, -1, 73 56, 58 74 }; 75 76 /* Transfering the general-purpose registers between GDB, inferiors 77 and core files. */ 78 79 /* Fill GDB's register array with the general-purpose register values 80 in *GREGSETP. */ 81 82 void 83 supply_gregset (struct regcache* regcache, 84 const elf_gregset_t *gregsetp) 85 { 86 elf_greg_t *regp = (elf_greg_t *) gregsetp; 87 int i; 88 89 for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++) 90 if (regmap[i] >= 0) 91 regcache->raw_supply (i, regp + regmap[i]); 92 } 93 94 /* Fill registers in *GREGSETPS with the values in GDB's 95 register array. */ 96 97 void 98 fill_gregset (const struct regcache* regcache, 99 elf_gregset_t *gregsetp, int regno) 100 { 101 elf_greg_t *regp = (elf_greg_t *) gregsetp; 102 int i; 103 104 for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++) 105 if (regmap[i] >= 0) 106 regcache->raw_collect (i, regp + regmap[i]); 107 } 108 109 /* Transfering floating-point registers between GDB, inferiors and cores. */ 110 111 /* Fill GDB's register array with the floating-point register values in 112 *FPREGSETP. */ 113 114 void 115 supply_fpregset (struct regcache *regcache, 116 const elf_fpregset_t *fpregsetp) 117 { 118 /* NOTE: There are no floating-point registers for TILE-Gx. */ 119 } 120 121 /* Fill register REGNO (if it is a floating-point register) in 122 *FPREGSETP with the value in GDB's register array. If REGNO is -1, 123 do this for all registers. */ 124 125 void 126 fill_fpregset (const struct regcache *regcache, 127 elf_fpregset_t *fpregsetp, int regno) 128 { 129 /* NOTE: There are no floating-point registers for TILE-Gx. */ 130 } 131 132 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this 133 for all registers. */ 134 135 void 136 tilegx_linux_nat_target::fetch_registers (struct regcache *regcache, 137 int regnum) 138 { 139 elf_gregset_t regs; 140 pid_t tid = get_ptrace_pid (regcache->ptid ()); 141 142 if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) ®s) < 0) 143 perror_with_name (_("Couldn't get registers")); 144 145 supply_gregset (regcache, (const elf_gregset_t *)®s); 146 } 147 148 /* Store register REGNUM back into the inferior. If REGNUM is -1, do 149 this for all registers. */ 150 151 void 152 tilegx_linux_nat_target::store_registers (struct regcache *regcache, 153 int regnum) 154 { 155 elf_gregset_t regs; 156 pid_t tid = get_ptrace_pid (regcache->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 void 168 _initialize_tile_linux_nat (void) 169 { 170 linux_target = &the_tilegx_linux_nat_target; 171 add_inf_child_target (&the_tilegx_linux_nat_target); 172 } 173