| 1 | /* GNU/Linux/m32r specific low level interface, for the remote server for GDB. |
| 2 | Copyright (C) 2005-2020 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 | |
| 22 | #ifdef HAVE_SYS_REG_H |
| 23 | #include <sys/reg.h> |
| 24 | #endif |
| 25 | |
| 26 | /* Linux target op definitions for the m32r architecture. */ |
| 27 | |
| 28 | class m32r_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 m32r_target the_m32r_target; |
| 56 | |
| 57 | bool |
| 58 | m32r_target::low_supports_breakpoints () |
| 59 | { |
| 60 | return true; |
| 61 | } |
| 62 | |
| 63 | CORE_ADDR |
| 64 | m32r_target::low_get_pc (regcache *regcache) |
| 65 | { |
| 66 | return linux_get_pc_32bit (regcache); |
| 67 | } |
| 68 | |
| 69 | void |
| 70 | m32r_target::low_set_pc (regcache *regcache, CORE_ADDR pc) |
| 71 | { |
| 72 | linux_set_pc_32bit (regcache, pc); |
| 73 | } |
| 74 | |
| 75 | /* Defined in auto-generated file reg-m32r.c. */ |
| 76 | void init_registers_m32r (void); |
| 77 | extern const struct target_desc *tdesc_m32r; |
| 78 | |
| 79 | #define m32r_num_regs 25 |
| 80 | |
| 81 | static int m32r_regmap[] = { |
| 82 | #ifdef PT_R0 |
| 83 | PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7, |
| 84 | PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_FP, PT_LR, PT_SPU, |
| 85 | PT_PSW, PT_CBR, PT_SPI, PT_SPU, PT_BPC, PT_PC, PT_ACCL, PT_ACCH, PT_EVB |
| 86 | #else |
| 87 | 4 * 4, 4 * 5, 4 * 6, 4 * 7, 4 * 0, 4 * 1, 4 * 2, 4 * 8, |
| 88 | 4 * 9, 4 * 10, 4 * 11, 4 * 12, 4 * 13, 4 * 24, 4 * 25, 4 * 23, |
| 89 | 4 * 19, 4 * 31, 4 * 26, 4 * 23, 4 * 20, 4 * 30, 4 * 16, 4 * 15, 4 * 32 |
| 90 | #endif |
| 91 | }; |
| 92 | |
| 93 | bool |
| 94 | m32r_target::low_cannot_store_register (int regno) |
| 95 | { |
| 96 | return (regno >= m32r_num_regs); |
| 97 | } |
| 98 | |
| 99 | bool |
| 100 | m32r_target::low_cannot_fetch_register (int regno) |
| 101 | { |
| 102 | return (regno >= m32r_num_regs); |
| 103 | } |
| 104 | |
| 105 | static const unsigned short m32r_breakpoint = 0x10f1; |
| 106 | #define m32r_breakpoint_len 2 |
| 107 | |
| 108 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ |
| 109 | |
| 110 | const gdb_byte * |
| 111 | m32r_target::sw_breakpoint_from_kind (int kind, int *size) |
| 112 | { |
| 113 | *size = m32r_breakpoint_len; |
| 114 | return (const gdb_byte *) &m32r_breakpoint; |
| 115 | } |
| 116 | |
| 117 | bool |
| 118 | m32r_target::low_breakpoint_at (CORE_ADDR where) |
| 119 | { |
| 120 | unsigned short insn; |
| 121 | |
| 122 | read_memory (where, (unsigned char *) &insn, m32r_breakpoint_len); |
| 123 | if (insn == m32r_breakpoint) |
| 124 | return true; |
| 125 | |
| 126 | /* If necessary, recognize more trap instructions here. GDB only uses the |
| 127 | one. */ |
| 128 | return false; |
| 129 | } |
| 130 | |
| 131 | void |
| 132 | m32r_target::low_arch_setup () |
| 133 | { |
| 134 | current_process ()->tdesc = tdesc_m32r; |
| 135 | } |
| 136 | |
| 137 | /* Support for hardware single step. */ |
| 138 | |
| 139 | static int |
| 140 | m32r_supports_hardware_single_step (void) |
| 141 | { |
| 142 | return 1; |
| 143 | } |
| 144 | |
| 145 | static struct usrregs_info m32r_usrregs_info = |
| 146 | { |
| 147 | m32r_num_regs, |
| 148 | m32r_regmap, |
| 149 | }; |
| 150 | |
| 151 | static struct regs_info myregs_info = |
| 152 | { |
| 153 | NULL, /* regset_bitmap */ |
| 154 | &m32r_usrregs_info, |
| 155 | }; |
| 156 | |
| 157 | const regs_info * |
| 158 | m32r_target::get_regs_info () |
| 159 | { |
| 160 | return &myregs_info; |
| 161 | } |
| 162 | |
| 163 | struct linux_target_ops the_low_target = { |
| 164 | NULL, /* install_fast_tracepoint_jump_pad */ |
| 165 | NULL, /* emit_ops */ |
| 166 | NULL, /* get_min_fast_tracepoint_insn_len */ |
| 167 | NULL, /* supports_range_stepping */ |
| 168 | m32r_supports_hardware_single_step, |
| 169 | }; |
| 170 | |
| 171 | /* The linux target ops object. */ |
| 172 | |
| 173 | linux_process_target *the_linux_target = &the_m32r_target; |
| 174 | |
| 175 | void |
| 176 | initialize_low_arch (void) |
| 177 | { |
| 178 | init_registers_m32r (); |
| 179 | } |