| 1 | /* GNU/Linux/BFIN specific low level interface, for the remote server for GDB. |
| 2 | |
| 3 | Copyright (C) 2005-2020 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by Analog Devices, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "server.h" |
| 23 | #include "linux-low.h" |
| 24 | #include <asm/ptrace.h> |
| 25 | |
| 26 | /* Linux target op definitions for the BFIN architecture. */ |
| 27 | |
| 28 | class bfin_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 | int low_decr_pc_after_break () override; |
| 51 | |
| 52 | bool low_breakpoint_at (CORE_ADDR pc) override; |
| 53 | }; |
| 54 | |
| 55 | /* The singleton target ops object. */ |
| 56 | |
| 57 | static bfin_target the_bfin_target; |
| 58 | |
| 59 | bool |
| 60 | bfin_target::low_supports_breakpoints () |
| 61 | { |
| 62 | return true; |
| 63 | } |
| 64 | |
| 65 | CORE_ADDR |
| 66 | bfin_target::low_get_pc (regcache *regcache) |
| 67 | { |
| 68 | return linux_get_pc_32bit (regcache); |
| 69 | } |
| 70 | |
| 71 | void |
| 72 | bfin_target::low_set_pc (regcache *regcache, CORE_ADDR pc) |
| 73 | { |
| 74 | linux_set_pc_32bit (regcache, pc); |
| 75 | } |
| 76 | |
| 77 | int |
| 78 | bfin_target::low_decr_pc_after_break () |
| 79 | { |
| 80 | return 2; |
| 81 | } |
| 82 | |
| 83 | /* Defined in auto-generated file reg-bfin.c. */ |
| 84 | void init_registers_bfin (void); |
| 85 | extern const struct target_desc *tdesc_bfin; |
| 86 | |
| 87 | static int bfin_regmap[] = |
| 88 | { |
| 89 | PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7, |
| 90 | PT_P0, PT_P1, PT_P2, PT_P3, PT_P4, PT_P5, PT_USP, PT_FP, |
| 91 | PT_I0, PT_I1, PT_I2, PT_I3, PT_M0, PT_M1, PT_M2, PT_M3, |
| 92 | PT_B0, PT_B1, PT_B2, PT_B3, PT_L0, PT_L1, PT_L2, PT_L3, |
| 93 | PT_A0X, PT_A0W, PT_A1X, PT_A1W, PT_ASTAT, PT_RETS, |
| 94 | PT_LC0, PT_LT0, PT_LB0, PT_LC1, PT_LT1, PT_LB1, |
| 95 | -1 /* PT_CYCLES */, -1 /* PT_CYCLES2 */, |
| 96 | -1 /* PT_USP */, PT_SEQSTAT, PT_SYSCFG, PT_PC, PT_RETX, PT_RETN, PT_RETE, |
| 97 | PT_PC, |
| 98 | }; |
| 99 | |
| 100 | #define bfin_num_regs ARRAY_SIZE (bfin_regmap) |
| 101 | |
| 102 | bool |
| 103 | bfin_target::low_cannot_store_register (int regno) |
| 104 | { |
| 105 | return (regno >= bfin_num_regs); |
| 106 | } |
| 107 | |
| 108 | bool |
| 109 | bfin_target::low_cannot_fetch_register (int regno) |
| 110 | { |
| 111 | return (regno >= bfin_num_regs); |
| 112 | } |
| 113 | |
| 114 | #define bfin_breakpoint_len 2 |
| 115 | static const gdb_byte bfin_breakpoint[bfin_breakpoint_len] = {0xa1, 0x00}; |
| 116 | |
| 117 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ |
| 118 | |
| 119 | const gdb_byte * |
| 120 | bfin_target::sw_breakpoint_from_kind (int kind, int *size) |
| 121 | { |
| 122 | *size = bfin_breakpoint_len; |
| 123 | return bfin_breakpoint; |
| 124 | } |
| 125 | |
| 126 | bool |
| 127 | bfin_target::low_breakpoint_at (CORE_ADDR where) |
| 128 | { |
| 129 | unsigned char insn[bfin_breakpoint_len]; |
| 130 | |
| 131 | read_inferior_memory(where, insn, bfin_breakpoint_len); |
| 132 | if (insn[0] == bfin_breakpoint[0] |
| 133 | && insn[1] == bfin_breakpoint[1]) |
| 134 | return true; |
| 135 | |
| 136 | /* If necessary, recognize more trap instructions here. GDB only uses the |
| 137 | one. */ |
| 138 | return false; |
| 139 | } |
| 140 | |
| 141 | void |
| 142 | bfin_target::low_arch_setup () |
| 143 | { |
| 144 | current_process ()->tdesc = tdesc_bfin; |
| 145 | } |
| 146 | |
| 147 | /* Support for hardware single step. */ |
| 148 | |
| 149 | static int |
| 150 | bfin_supports_hardware_single_step (void) |
| 151 | { |
| 152 | return 1; |
| 153 | } |
| 154 | |
| 155 | static struct usrregs_info bfin_usrregs_info = |
| 156 | { |
| 157 | bfin_num_regs, |
| 158 | bfin_regmap, |
| 159 | }; |
| 160 | |
| 161 | static struct regs_info myregs_info = |
| 162 | { |
| 163 | NULL, /* regset_bitmap */ |
| 164 | &bfin_usrregs_info, |
| 165 | }; |
| 166 | |
| 167 | const regs_info * |
| 168 | bfin_target::get_regs_info () |
| 169 | { |
| 170 | return &myregs_info; |
| 171 | } |
| 172 | |
| 173 | struct linux_target_ops the_low_target = { |
| 174 | NULL, /* stopped_by_watchpoint */ |
| 175 | NULL, /* stopped_data_address */ |
| 176 | NULL, /* collect_ptrace_register */ |
| 177 | NULL, /* supply_ptrace_register */ |
| 178 | NULL, /* siginfo_fixup */ |
| 179 | NULL, /* new_process */ |
| 180 | NULL, /* delete_process */ |
| 181 | NULL, /* new_thread */ |
| 182 | NULL, /* delete_thread */ |
| 183 | NULL, /* new_fork */ |
| 184 | NULL, /* prepare_to_resume */ |
| 185 | NULL, /* process_qsupported */ |
| 186 | NULL, /* supports_tracepoints */ |
| 187 | NULL, /* get_thread_area */ |
| 188 | NULL, /* install_fast_tracepoint_jump_pad */ |
| 189 | NULL, /* emit_ops */ |
| 190 | NULL, /* get_min_fast_tracepoint_insn_len */ |
| 191 | NULL, /* supports_range_stepping */ |
| 192 | bfin_supports_hardware_single_step, |
| 193 | }; |
| 194 | |
| 195 | /* The linux target ops object. */ |
| 196 | |
| 197 | linux_process_target *the_linux_target = &the_bfin_target; |
| 198 | |
| 199 | void |
| 200 | initialize_low_arch (void) |
| 201 | { |
| 202 | init_registers_bfin (); |
| 203 | } |