| 1 | /* GNU/Linux/m68k 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 | /* Defined in auto-generated file reg-m68k.c. */ |
| 23 | void init_registers_m68k (void); |
| 24 | extern const struct target_desc *tdesc_m68k; |
| 25 | |
| 26 | #ifdef HAVE_SYS_REG_H |
| 27 | #include <sys/reg.h> |
| 28 | #endif |
| 29 | |
| 30 | #define m68k_num_regs 29 |
| 31 | #define m68k_num_gregs 18 |
| 32 | |
| 33 | /* This table must line up with REGISTER_NAMES in tm-m68k.h */ |
| 34 | static int m68k_regmap[] = |
| 35 | { |
| 36 | #ifdef PT_D0 |
| 37 | PT_D0 * 4, PT_D1 * 4, PT_D2 * 4, PT_D3 * 4, |
| 38 | PT_D4 * 4, PT_D5 * 4, PT_D6 * 4, PT_D7 * 4, |
| 39 | PT_A0 * 4, PT_A1 * 4, PT_A2 * 4, PT_A3 * 4, |
| 40 | PT_A4 * 4, PT_A5 * 4, PT_A6 * 4, PT_USP * 4, |
| 41 | PT_SR * 4, PT_PC * 4, |
| 42 | #else |
| 43 | 14 * 4, 0 * 4, 1 * 4, 2 * 4, 3 * 4, 4 * 4, 5 * 4, 6 * 4, |
| 44 | 7 * 4, 8 * 4, 9 * 4, 10 * 4, 11 * 4, 12 * 4, 13 * 4, 15 * 4, |
| 45 | 17 * 4, 18 * 4, |
| 46 | #endif |
| 47 | #ifdef PT_FP0 |
| 48 | PT_FP0 * 4, PT_FP1 * 4, PT_FP2 * 4, PT_FP3 * 4, |
| 49 | PT_FP4 * 4, PT_FP5 * 4, PT_FP6 * 4, PT_FP7 * 4, |
| 50 | PT_FPCR * 4, PT_FPSR * 4, PT_FPIAR * 4 |
| 51 | #else |
| 52 | 21 * 4, 24 * 4, 27 * 4, 30 * 4, 33 * 4, 36 * 4, |
| 53 | 39 * 4, 42 * 4, 45 * 4, 46 * 4, 47 * 4 |
| 54 | #endif |
| 55 | }; |
| 56 | |
| 57 | static int |
| 58 | m68k_cannot_store_register (int regno) |
| 59 | { |
| 60 | return (regno >= m68k_num_regs); |
| 61 | } |
| 62 | |
| 63 | static int |
| 64 | m68k_cannot_fetch_register (int regno) |
| 65 | { |
| 66 | return (regno >= m68k_num_regs); |
| 67 | } |
| 68 | |
| 69 | #ifdef HAVE_PTRACE_GETREGS |
| 70 | #include <sys/procfs.h> |
| 71 | #include "nat/gdb_ptrace.h" |
| 72 | |
| 73 | static void |
| 74 | m68k_fill_gregset (struct regcache *regcache, void *buf) |
| 75 | { |
| 76 | int i; |
| 77 | |
| 78 | for (i = 0; i < m68k_num_gregs; i++) |
| 79 | collect_register (regcache, i, (char *) buf + m68k_regmap[i]); |
| 80 | } |
| 81 | |
| 82 | static void |
| 83 | m68k_store_gregset (struct regcache *regcache, const void *buf) |
| 84 | { |
| 85 | int i; |
| 86 | |
| 87 | for (i = 0; i < m68k_num_gregs; i++) |
| 88 | supply_register (regcache, i, (const char *) buf + m68k_regmap[i]); |
| 89 | } |
| 90 | |
| 91 | static void |
| 92 | m68k_fill_fpregset (struct regcache *regcache, void *buf) |
| 93 | { |
| 94 | int i; |
| 95 | |
| 96 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) |
| 97 | collect_register (regcache, i, ((char *) buf |
| 98 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); |
| 99 | } |
| 100 | |
| 101 | static void |
| 102 | m68k_store_fpregset (struct regcache *regcache, const void *buf) |
| 103 | { |
| 104 | int i; |
| 105 | |
| 106 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) |
| 107 | supply_register (regcache, i, ((const char *) buf |
| 108 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); |
| 109 | } |
| 110 | |
| 111 | #endif /* HAVE_PTRACE_GETREGS */ |
| 112 | |
| 113 | static struct regset_info m68k_regsets[] = { |
| 114 | #ifdef HAVE_PTRACE_GETREGS |
| 115 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
| 116 | GENERAL_REGS, |
| 117 | m68k_fill_gregset, m68k_store_gregset }, |
| 118 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (elf_fpregset_t), |
| 119 | FP_REGS, |
| 120 | m68k_fill_fpregset, m68k_store_fpregset }, |
| 121 | #endif /* HAVE_PTRACE_GETREGS */ |
| 122 | NULL_REGSET |
| 123 | }; |
| 124 | |
| 125 | static const gdb_byte m68k_breakpoint[] = { 0x4E, 0x4F }; |
| 126 | #define m68k_breakpoint_len 2 |
| 127 | |
| 128 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
| 129 | |
| 130 | static const gdb_byte * |
| 131 | m68k_sw_breakpoint_from_kind (int kind, int *size) |
| 132 | { |
| 133 | *size = m68k_breakpoint_len; |
| 134 | return m68k_breakpoint; |
| 135 | } |
| 136 | |
| 137 | static int |
| 138 | m68k_breakpoint_at (CORE_ADDR pc) |
| 139 | { |
| 140 | unsigned char c[2]; |
| 141 | |
| 142 | read_inferior_memory (pc, c, 2); |
| 143 | if (c[0] == 0x4E && c[1] == 0x4F) |
| 144 | return 1; |
| 145 | |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | #include <asm/ptrace.h> |
| 150 | |
| 151 | #ifdef PTRACE_GET_THREAD_AREA |
| 152 | /* Fetch the thread-local storage pointer for libthread_db. */ |
| 153 | |
| 154 | ps_err_e |
| 155 | ps_get_thread_area (struct ps_prochandle *ph, |
| 156 | lwpid_t lwpid, int idx, void **base) |
| 157 | { |
| 158 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) |
| 159 | return PS_ERR; |
| 160 | |
| 161 | /* IDX is the bias from the thread pointer to the beginning of the |
| 162 | thread descriptor. It has to be subtracted due to implementation |
| 163 | quirks in libthread_db. */ |
| 164 | *base = (void *) ((char *)*base - idx); |
| 165 | |
| 166 | return PS_OK; |
| 167 | } |
| 168 | #endif /* PTRACE_GET_THREAD_AREA */ |
| 169 | |
| 170 | static struct regsets_info m68k_regsets_info = |
| 171 | { |
| 172 | m68k_regsets, /* regsets */ |
| 173 | 0, /* num_regsets */ |
| 174 | NULL, /* disabled_regsets */ |
| 175 | }; |
| 176 | |
| 177 | static struct usrregs_info m68k_usrregs_info = |
| 178 | { |
| 179 | m68k_num_regs, |
| 180 | m68k_regmap, |
| 181 | }; |
| 182 | |
| 183 | static struct regs_info regs_info = |
| 184 | { |
| 185 | NULL, /* regset_bitmap */ |
| 186 | &m68k_usrregs_info, |
| 187 | &m68k_regsets_info |
| 188 | }; |
| 189 | |
| 190 | static const struct regs_info * |
| 191 | m68k_regs_info (void) |
| 192 | { |
| 193 | return ®s_info; |
| 194 | } |
| 195 | |
| 196 | static void |
| 197 | m68k_arch_setup (void) |
| 198 | { |
| 199 | current_process ()->tdesc = tdesc_m68k; |
| 200 | } |
| 201 | |
| 202 | /* Support for hardware single step. */ |
| 203 | |
| 204 | static int |
| 205 | m68k_supports_hardware_single_step (void) |
| 206 | { |
| 207 | return 1; |
| 208 | } |
| 209 | |
| 210 | struct linux_target_ops the_low_target = { |
| 211 | m68k_arch_setup, |
| 212 | m68k_regs_info, |
| 213 | m68k_cannot_fetch_register, |
| 214 | m68k_cannot_store_register, |
| 215 | NULL, /* fetch_register */ |
| 216 | linux_get_pc_32bit, |
| 217 | linux_set_pc_32bit, |
| 218 | NULL, /* breakpoint_kind_from_pc */ |
| 219 | m68k_sw_breakpoint_from_kind, |
| 220 | NULL, |
| 221 | 2, |
| 222 | m68k_breakpoint_at, |
| 223 | NULL, /* supports_z_point_type */ |
| 224 | NULL, /* insert_point */ |
| 225 | NULL, /* remove_point */ |
| 226 | NULL, /* stopped_by_watchpoint */ |
| 227 | NULL, /* stopped_data_address */ |
| 228 | NULL, /* collect_ptrace_register */ |
| 229 | NULL, /* supply_ptrace_register */ |
| 230 | NULL, /* siginfo_fixup */ |
| 231 | NULL, /* new_process */ |
| 232 | NULL, /* delete_process */ |
| 233 | NULL, /* new_thread */ |
| 234 | NULL, /* delete_thread */ |
| 235 | NULL, /* new_fork */ |
| 236 | NULL, /* prepare_to_resume */ |
| 237 | NULL, /* process_qsupported */ |
| 238 | NULL, /* supports_tracepoints */ |
| 239 | NULL, /* get_thread_area */ |
| 240 | NULL, /* install_fast_tracepoint_jump_pad */ |
| 241 | NULL, /* emit_ops */ |
| 242 | NULL, /* get_min_fast_tracepoint_insn_len */ |
| 243 | NULL, /* supports_range_stepping */ |
| 244 | NULL, /* breakpoint_kind_from_current_state */ |
| 245 | m68k_supports_hardware_single_step, |
| 246 | }; |
| 247 | |
| 248 | void |
| 249 | initialize_low_arch (void) |
| 250 | { |
| 251 | /* Initialize the Linux target descriptions. */ |
| 252 | init_registers_m68k (); |
| 253 | |
| 254 | initialize_regsets_info (&m68k_regsets_info); |
| 255 | } |