| 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 | } |