| 1 | /* GNU/Linux/TILE-Gx specific low level interface, GDBserver. |
| 2 | |
| 3 | Copyright (C) 2012-2020 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 "server.h" |
| 21 | #include "linux-low.h" |
| 22 | |
| 23 | #include <arch/abi.h> |
| 24 | #include "nat/gdb_ptrace.h" |
| 25 | |
| 26 | /* Linux target op definitions for the TILE-Gx architecture. */ |
| 27 | |
| 28 | class tile_target : public linux_process_target |
| 29 | { |
| 30 | public: |
| 31 | |
| 32 | const regs_info *get_regs_info () override; |
| 33 | |
| 34 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; |
| 35 | |
| 36 | protected: |
| 37 | |
| 38 | void low_arch_setup () override; |
| 39 | |
| 40 | bool low_cannot_fetch_register (int regno) override; |
| 41 | |
| 42 | bool low_cannot_store_register (int regno) override; |
| 43 | |
| 44 | bool low_supports_breakpoints () override; |
| 45 | |
| 46 | CORE_ADDR low_get_pc (regcache *regcache) override; |
| 47 | |
| 48 | void low_set_pc (regcache *regcache, CORE_ADDR newpc) override; |
| 49 | |
| 50 | bool low_breakpoint_at (CORE_ADDR pc) override; |
| 51 | }; |
| 52 | |
| 53 | /* The singleton target ops object. */ |
| 54 | |
| 55 | static tile_target the_tile_target; |
| 56 | |
| 57 | bool |
| 58 | tile_target::low_supports_breakpoints () |
| 59 | { |
| 60 | return true; |
| 61 | } |
| 62 | |
| 63 | CORE_ADDR |
| 64 | tile_target::low_get_pc (regcache *regcache) |
| 65 | { |
| 66 | return linux_get_pc_64bit (regcache); |
| 67 | } |
| 68 | |
| 69 | void |
| 70 | tile_target::low_set_pc (regcache *regcache, CORE_ADDR pc) |
| 71 | { |
| 72 | linux_set_pc_64bit (regcache, pc); |
| 73 | } |
| 74 | |
| 75 | /* Defined in auto-generated file reg-tilegx.c. */ |
| 76 | void init_registers_tilegx (void); |
| 77 | extern const struct target_desc *tdesc_tilegx; |
| 78 | |
| 79 | /* Defined in auto-generated file reg-tilegx32.c. */ |
| 80 | void init_registers_tilegx32 (void); |
| 81 | extern const struct target_desc *tdesc_tilegx32; |
| 82 | |
| 83 | #define tile_num_regs 65 |
| 84 | |
| 85 | static int tile_regmap[] = |
| 86 | { |
| 87 | 0, 1, 2, 3, 4, 5, 6, 7, |
| 88 | 8, 9, 10, 11, 12, 13, 14, 15, |
| 89 | 16, 17, 18, 19, 20, 21, 22, 23, |
| 90 | 24, 25, 26, 27, 28, 29, 30, 31, |
| 91 | 32, 33, 34, 35, 36, 37, 38, 39, |
| 92 | 40, 41, 42, 43, 44, 45, 46, 47, |
| 93 | 48, 49, 50, 51, 52, 53, 54, 55, |
| 94 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 95 | 56 |
| 96 | }; |
| 97 | |
| 98 | bool |
| 99 | tile_target::low_cannot_fetch_register (int regno) |
| 100 | { |
| 101 | if (regno >= 0 && regno < 56) |
| 102 | return false; |
| 103 | else if (regno == 64) |
| 104 | return false; |
| 105 | else |
| 106 | return true; |
| 107 | } |
| 108 | |
| 109 | bool |
| 110 | tile_target::low_cannot_store_register (int regno) |
| 111 | { |
| 112 | if (regno >= 0 && regno < 56) |
| 113 | return false; |
| 114 | else if (regno == 64) |
| 115 | return false; |
| 116 | else |
| 117 | return true; |
| 118 | } |
| 119 | |
| 120 | static uint64_t tile_breakpoint = 0x400b3cae70166000ULL; |
| 121 | #define tile_breakpoint_len 8 |
| 122 | |
| 123 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ |
| 124 | |
| 125 | const gdb_byte * |
| 126 | tile_target::sw_breakpoint_from_kind (int kind, int *size) |
| 127 | { |
| 128 | *size = tile_breakpoint_len; |
| 129 | return (const gdb_byte *) &tile_breakpoint; |
| 130 | } |
| 131 | |
| 132 | bool |
| 133 | tile_target::low_breakpoint_at (CORE_ADDR where) |
| 134 | { |
| 135 | uint64_t insn; |
| 136 | |
| 137 | read_memory (where, (unsigned char *) &insn, 8); |
| 138 | if (insn == tile_breakpoint) |
| 139 | return true; |
| 140 | |
| 141 | /* If necessary, recognize more trap instructions here. GDB only uses the |
| 142 | one. */ |
| 143 | return false; |
| 144 | } |
| 145 | |
| 146 | static void |
| 147 | tile_fill_gregset (struct regcache *regcache, void *buf) |
| 148 | { |
| 149 | int i; |
| 150 | |
| 151 | for (i = 0; i < tile_num_regs; i++) |
| 152 | if (tile_regmap[i] != -1) |
| 153 | collect_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]); |
| 154 | } |
| 155 | |
| 156 | static void |
| 157 | tile_store_gregset (struct regcache *regcache, const void *buf) |
| 158 | { |
| 159 | int i; |
| 160 | |
| 161 | for (i = 0; i < tile_num_regs; i++) |
| 162 | if (tile_regmap[i] != -1) |
| 163 | supply_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]); |
| 164 | } |
| 165 | |
| 166 | static struct regset_info tile_regsets[] = |
| 167 | { |
| 168 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, tile_num_regs * 8, |
| 169 | GENERAL_REGS, tile_fill_gregset, tile_store_gregset }, |
| 170 | NULL_REGSET |
| 171 | }; |
| 172 | |
| 173 | static struct regsets_info tile_regsets_info = |
| 174 | { |
| 175 | tile_regsets, /* regsets */ |
| 176 | 0, /* num_regsets */ |
| 177 | NULL, /* disabled_regsets */ |
| 178 | }; |
| 179 | |
| 180 | static struct usrregs_info tile_usrregs_info = |
| 181 | { |
| 182 | tile_num_regs, |
| 183 | tile_regmap, |
| 184 | }; |
| 185 | |
| 186 | static struct regs_info myregs_info = |
| 187 | { |
| 188 | NULL, /* regset_bitmap */ |
| 189 | &tile_usrregs_info, |
| 190 | &tile_regsets_info, |
| 191 | }; |
| 192 | |
| 193 | const regs_info * |
| 194 | tile_target::get_regs_info () |
| 195 | { |
| 196 | return &myregs_info; |
| 197 | } |
| 198 | |
| 199 | void |
| 200 | tile_target::low_arch_setup () |
| 201 | { |
| 202 | int pid = pid_of (current_thread); |
| 203 | unsigned int machine; |
| 204 | int is_elf64 = linux_pid_exe_is_elf_64_file (pid, &machine); |
| 205 | |
| 206 | if (sizeof (void *) == 4) |
| 207 | if (is_elf64 > 0) |
| 208 | error (_("Can't debug 64-bit process with 32-bit GDBserver")); |
| 209 | |
| 210 | if (!is_elf64) |
| 211 | current_process ()->tdesc = tdesc_tilegx32; |
| 212 | else |
| 213 | current_process ()->tdesc = tdesc_tilegx; |
| 214 | } |
| 215 | |
| 216 | /* The linux target ops object. */ |
| 217 | |
| 218 | linux_process_target *the_linux_target = &the_tile_target; |
| 219 | |
| 220 | void |
| 221 | initialize_low_arch (void) |
| 222 | { |
| 223 | init_registers_tilegx32(); |
| 224 | init_registers_tilegx(); |
| 225 | |
| 226 | initialize_regsets_info (&tile_regsets_info); |
| 227 | } |