| 1 | /* GNU/Linux/CRIS specific low level interface, for the remote server for GDB. |
| 2 | Copyright (C) 1995-2020 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include "server.h" |
| 20 | #include "linux-low.h" |
| 21 | #include "nat/gdb_ptrace.h" |
| 22 | |
| 23 | /* Linux target op definitions for the CRIS architecture. */ |
| 24 | |
| 25 | class cris_target : public linux_process_target |
| 26 | { |
| 27 | public: |
| 28 | |
| 29 | const regs_info *get_regs_info () override; |
| 30 | |
| 31 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; |
| 32 | |
| 33 | protected: |
| 34 | |
| 35 | void low_arch_setup () override; |
| 36 | |
| 37 | bool low_cannot_fetch_register (int regno) override; |
| 38 | |
| 39 | bool low_cannot_store_register (int regno) override; |
| 40 | |
| 41 | bool low_supports_breakpoints () override; |
| 42 | |
| 43 | CORE_ADDR low_get_pc (regcache *regcache) override; |
| 44 | |
| 45 | void low_set_pc (regcache *regcache, CORE_ADDR newpc) override; |
| 46 | }; |
| 47 | |
| 48 | /* The singleton target ops object. */ |
| 49 | |
| 50 | static cris_target the_cris_target; |
| 51 | |
| 52 | bool |
| 53 | cris_target::low_supports_breakpoints () |
| 54 | { |
| 55 | return true; |
| 56 | } |
| 57 | |
| 58 | CORE_ADDR |
| 59 | cris_target::low_get_pc (regcache *regcache) |
| 60 | { |
| 61 | return linux_get_pc_32bit (regcache); |
| 62 | } |
| 63 | |
| 64 | void |
| 65 | cris_target::low_set_pc (regcache *regcache, CORE_ADDR pc) |
| 66 | { |
| 67 | linux_set_pc_32bit (regcache, pc); |
| 68 | } |
| 69 | |
| 70 | /* Defined in auto-generated file reg-cris.c. */ |
| 71 | void init_registers_cris (void); |
| 72 | extern const struct target_desc *tdesc_cris; |
| 73 | |
| 74 | /* CRISv10 */ |
| 75 | #define cris_num_regs 32 |
| 76 | |
| 77 | /* Locations need to match <include/asm/arch/ptrace.h>. */ |
| 78 | static int cris_regmap[] = { |
| 79 | 15*4, 14*4, 13*4, 12*4, |
| 80 | 11*4, 10*4, 9*4, 8*4, |
| 81 | 7*4, 6*4, 5*4, 4*4, |
| 82 | 3*4, 2*4, 23*4, 19*4, |
| 83 | |
| 84 | -1, -1, -1, -1, |
| 85 | -1, 17*4, -1, 16*4, |
| 86 | -1, -1, -1, 18*4, |
| 87 | -1, 17*4, -1, -1 |
| 88 | |
| 89 | }; |
| 90 | |
| 91 | bool |
| 92 | cris_target::low_cannot_store_register (int regno) |
| 93 | { |
| 94 | if (cris_regmap[regno] == -1) |
| 95 | return true; |
| 96 | |
| 97 | return (regno >= cris_num_regs); |
| 98 | } |
| 99 | |
| 100 | bool |
| 101 | cris_target::low_cannot_fetch_register (int regno) |
| 102 | { |
| 103 | if (cris_regmap[regno] == -1) |
| 104 | return true; |
| 105 | |
| 106 | return (regno >= cris_num_regs); |
| 107 | } |
| 108 | |
| 109 | static const unsigned short cris_breakpoint = 0xe938; |
| 110 | #define cris_breakpoint_len 2 |
| 111 | |
| 112 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ |
| 113 | |
| 114 | const gdb_byte * |
| 115 | cris_target::sw_breakpoint_from_kind (int kind, int *size) |
| 116 | { |
| 117 | *size = cris_breakpoint_len; |
| 118 | return (const gdb_byte *) &cris_breakpoint; |
| 119 | } |
| 120 | |
| 121 | static int |
| 122 | cris_breakpoint_at (CORE_ADDR where) |
| 123 | { |
| 124 | unsigned short insn; |
| 125 | |
| 126 | the_target->read_memory (where, (unsigned char *) &insn, |
| 127 | cris_breakpoint_len); |
| 128 | if (insn == cris_breakpoint) |
| 129 | return 1; |
| 130 | |
| 131 | /* If necessary, recognize more trap instructions here. GDB only uses the |
| 132 | one. */ |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | void |
| 137 | cris_target::low_arch_setup () |
| 138 | { |
| 139 | current_process ()->tdesc = tdesc_cris; |
| 140 | } |
| 141 | |
| 142 | static struct usrregs_info cris_usrregs_info = |
| 143 | { |
| 144 | cris_num_regs, |
| 145 | cris_regmap, |
| 146 | }; |
| 147 | |
| 148 | static struct regs_info myregs_info = |
| 149 | { |
| 150 | NULL, /* regset_bitmap */ |
| 151 | &cris_usrregs_info, |
| 152 | }; |
| 153 | |
| 154 | const regs_info * |
| 155 | cris_target::get_regs_info () |
| 156 | { |
| 157 | return &myregs_info; |
| 158 | } |
| 159 | |
| 160 | struct linux_target_ops the_low_target = { |
| 161 | NULL, /* get_next_pcs */ |
| 162 | 0, |
| 163 | cris_breakpoint_at, |
| 164 | }; |
| 165 | |
| 166 | /* The linux target ops object. */ |
| 167 | |
| 168 | linux_process_target *the_linux_target = &the_cris_target; |
| 169 | |
| 170 | void |
| 171 | initialize_low_arch (void) |
| 172 | { |
| 173 | init_registers_cris (); |
| 174 | } |