| 1 | /* GNU/Linux/SH 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 | |
| 22 | /* Linux target op definitions for the SH architecture. */ |
| 23 | |
| 24 | class sh_target : public linux_process_target |
| 25 | { |
| 26 | public: |
| 27 | |
| 28 | const regs_info *get_regs_info () override; |
| 29 | |
| 30 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; |
| 31 | |
| 32 | protected: |
| 33 | |
| 34 | void low_arch_setup () override; |
| 35 | |
| 36 | bool low_cannot_fetch_register (int regno) override; |
| 37 | |
| 38 | bool low_cannot_store_register (int regno) override; |
| 39 | |
| 40 | bool low_supports_breakpoints () override; |
| 41 | |
| 42 | CORE_ADDR low_get_pc (regcache *regcache) override; |
| 43 | |
| 44 | void low_set_pc (regcache *regcache, CORE_ADDR newpc) override; |
| 45 | |
| 46 | bool low_breakpoint_at (CORE_ADDR pc) override; |
| 47 | }; |
| 48 | |
| 49 | /* The singleton target ops object. */ |
| 50 | |
| 51 | static sh_target the_sh_target; |
| 52 | |
| 53 | bool |
| 54 | sh_target::low_supports_breakpoints () |
| 55 | { |
| 56 | return true; |
| 57 | } |
| 58 | |
| 59 | CORE_ADDR |
| 60 | sh_target::low_get_pc (regcache *regcache) |
| 61 | { |
| 62 | return linux_get_pc_32bit (regcache); |
| 63 | } |
| 64 | |
| 65 | void |
| 66 | sh_target::low_set_pc (regcache *regcache, CORE_ADDR pc) |
| 67 | { |
| 68 | linux_set_pc_32bit (regcache, pc); |
| 69 | } |
| 70 | |
| 71 | /* Defined in auto-generated file reg-sh.c. */ |
| 72 | void init_registers_sh (void); |
| 73 | extern const struct target_desc *tdesc_sh; |
| 74 | |
| 75 | #ifdef HAVE_SYS_REG_H |
| 76 | #include <sys/reg.h> |
| 77 | #endif |
| 78 | |
| 79 | #include <asm/ptrace.h> |
| 80 | |
| 81 | #define sh_num_regs 41 |
| 82 | |
| 83 | /* Currently, don't check/send MQ. */ |
| 84 | static int sh_regmap[] = { |
| 85 | 0, 4, 8, 12, 16, 20, 24, 28, |
| 86 | 32, 36, 40, 44, 48, 52, 56, 60, |
| 87 | |
| 88 | REG_PC*4, REG_PR*4, REG_GBR*4, -1, |
| 89 | REG_MACH*4, REG_MACL*4, REG_SR*4, |
| 90 | REG_FPUL*4, REG_FPSCR*4, |
| 91 | |
| 92 | REG_FPREG0*4+0, REG_FPREG0*4+4, REG_FPREG0*4+8, REG_FPREG0*4+12, |
| 93 | REG_FPREG0*4+16, REG_FPREG0*4+20, REG_FPREG0*4+24, REG_FPREG0*4+28, |
| 94 | REG_FPREG0*4+32, REG_FPREG0*4+36, REG_FPREG0*4+40, REG_FPREG0*4+44, |
| 95 | REG_FPREG0*4+48, REG_FPREG0*4+52, REG_FPREG0*4+56, REG_FPREG0*4+60, |
| 96 | }; |
| 97 | |
| 98 | bool |
| 99 | sh_target::low_cannot_store_register (int regno) |
| 100 | { |
| 101 | return false; |
| 102 | } |
| 103 | |
| 104 | bool |
| 105 | sh_target::low_cannot_fetch_register (int regno) |
| 106 | { |
| 107 | return false; |
| 108 | } |
| 109 | |
| 110 | /* Correct in either endianness, obviously. */ |
| 111 | static const unsigned short sh_breakpoint = 0xc3c3; |
| 112 | #define sh_breakpoint_len 2 |
| 113 | |
| 114 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ |
| 115 | |
| 116 | const gdb_byte * |
| 117 | sh_target::sw_breakpoint_from_kind (int kind, int *size) |
| 118 | { |
| 119 | *size = sh_breakpoint_len; |
| 120 | return (const gdb_byte *) &sh_breakpoint; |
| 121 | } |
| 122 | |
| 123 | bool |
| 124 | sh_target::low_breakpoint_at (CORE_ADDR where) |
| 125 | { |
| 126 | unsigned short insn; |
| 127 | |
| 128 | read_memory (where, (unsigned char *) &insn, 2); |
| 129 | if (insn == sh_breakpoint) |
| 130 | return true; |
| 131 | |
| 132 | /* If necessary, recognize more trap instructions here. GDB only uses the |
| 133 | one. */ |
| 134 | return false; |
| 135 | } |
| 136 | |
| 137 | /* Support for hardware single step. */ |
| 138 | |
| 139 | static int |
| 140 | sh_supports_hardware_single_step (void) |
| 141 | { |
| 142 | return 1; |
| 143 | } |
| 144 | |
| 145 | /* Provide only a fill function for the general register set. ps_lgetregs |
| 146 | will use this for NPTL support. */ |
| 147 | |
| 148 | static void sh_fill_gregset (struct regcache *regcache, void *buf) |
| 149 | { |
| 150 | int i; |
| 151 | |
| 152 | for (i = 0; i < 23; i++) |
| 153 | if (sh_regmap[i] != -1) |
| 154 | collect_register (regcache, i, (char *) buf + sh_regmap[i]); |
| 155 | } |
| 156 | |
| 157 | static struct regset_info sh_regsets[] = { |
| 158 | { 0, 0, 0, 0, GENERAL_REGS, sh_fill_gregset, NULL }, |
| 159 | NULL_REGSET |
| 160 | }; |
| 161 | |
| 162 | static struct regsets_info sh_regsets_info = |
| 163 | { |
| 164 | sh_regsets, /* regsets */ |
| 165 | 0, /* num_regsets */ |
| 166 | NULL, /* disabled_regsets */ |
| 167 | }; |
| 168 | |
| 169 | static struct usrregs_info sh_usrregs_info = |
| 170 | { |
| 171 | sh_num_regs, |
| 172 | sh_regmap, |
| 173 | }; |
| 174 | |
| 175 | static struct regs_info myregs_info = |
| 176 | { |
| 177 | NULL, /* regset_bitmap */ |
| 178 | &sh_usrregs_info, |
| 179 | &sh_regsets_info |
| 180 | }; |
| 181 | |
| 182 | const regs_info * |
| 183 | sh_target::get_regs_info () |
| 184 | { |
| 185 | return &myregs_info; |
| 186 | } |
| 187 | |
| 188 | void |
| 189 | sh_target::low_arch_setup () |
| 190 | { |
| 191 | current_process ()->tdesc = tdesc_sh; |
| 192 | } |
| 193 | |
| 194 | struct linux_target_ops the_low_target = { |
| 195 | NULL, /* stopped_by_watchpoint */ |
| 196 | NULL, /* stopped_data_address */ |
| 197 | NULL, /* collect_ptrace_register */ |
| 198 | NULL, /* supply_ptrace_register */ |
| 199 | NULL, /* siginfo_fixup */ |
| 200 | NULL, /* new_process */ |
| 201 | NULL, /* delete_process */ |
| 202 | NULL, /* new_thread */ |
| 203 | NULL, /* delete_thread */ |
| 204 | NULL, /* new_fork */ |
| 205 | NULL, /* prepare_to_resume */ |
| 206 | NULL, /* process_qsupported */ |
| 207 | NULL, /* supports_tracepoints */ |
| 208 | NULL, /* get_thread_area */ |
| 209 | NULL, /* install_fast_tracepoint_jump_pad */ |
| 210 | NULL, /* emit_ops */ |
| 211 | NULL, /* get_min_fast_tracepoint_insn_len */ |
| 212 | NULL, /* supports_range_stepping */ |
| 213 | sh_supports_hardware_single_step, |
| 214 | }; |
| 215 | |
| 216 | /* The linux target ops object. */ |
| 217 | |
| 218 | linux_process_target *the_linux_target = &the_sh_target; |
| 219 | |
| 220 | void |
| 221 | initialize_low_arch (void) |
| 222 | { |
| 223 | init_registers_sh (); |
| 224 | |
| 225 | initialize_regsets_info (&sh_regsets_info); |
| 226 | } |