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0a30fbc4 | 1 | /* GNU/Linux/m68k specific low level interface, for the remote server for GDB. |
b811d2c2 | 2 | Copyright (C) 1995-2020 Free Software Foundation, Inc. |
0a30fbc4 DJ |
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 | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
0a30fbc4 DJ |
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 | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0a30fbc4 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
0a30fbc4 | 21 | |
ef0478f6 TBA |
22 | /* Linux target op definitions for the m68k architecture. */ |
23 | ||
24 | class m68k_target : public linux_process_target | |
25 | { | |
26 | public: | |
27 | ||
aa8d21c9 TBA |
28 | const regs_info *get_regs_info () override; |
29 | ||
797bcff5 TBA |
30 | protected: |
31 | ||
32 | void low_arch_setup () override; | |
ef0478f6 TBA |
33 | }; |
34 | ||
35 | /* The singleton target ops object. */ | |
36 | ||
37 | static m68k_target the_m68k_target; | |
38 | ||
d05b4ac3 UW |
39 | /* Defined in auto-generated file reg-m68k.c. */ |
40 | void init_registers_m68k (void); | |
3aee8918 | 41 | extern const struct target_desc *tdesc_m68k; |
d05b4ac3 | 42 | |
0a30fbc4 DJ |
43 | #ifdef HAVE_SYS_REG_H |
44 | #include <sys/reg.h> | |
45 | #endif | |
46 | ||
4c0711e0 | 47 | #define m68k_num_regs 29 |
db1d3e1b | 48 | #define m68k_num_gregs 18 |
0a30fbc4 DJ |
49 | |
50 | /* This table must line up with REGISTER_NAMES in tm-m68k.h */ | |
2ec06d2e | 51 | static int m68k_regmap[] = |
0a30fbc4 DJ |
52 | { |
53 | #ifdef PT_D0 | |
54 | PT_D0 * 4, PT_D1 * 4, PT_D2 * 4, PT_D3 * 4, | |
55 | PT_D4 * 4, PT_D5 * 4, PT_D6 * 4, PT_D7 * 4, | |
56 | PT_A0 * 4, PT_A1 * 4, PT_A2 * 4, PT_A3 * 4, | |
57 | PT_A4 * 4, PT_A5 * 4, PT_A6 * 4, PT_USP * 4, | |
58 | PT_SR * 4, PT_PC * 4, | |
59 | #else | |
60 | 14 * 4, 0 * 4, 1 * 4, 2 * 4, 3 * 4, 4 * 4, 5 * 4, 6 * 4, | |
61 | 7 * 4, 8 * 4, 9 * 4, 10 * 4, 11 * 4, 12 * 4, 13 * 4, 15 * 4, | |
62 | 17 * 4, 18 * 4, | |
63 | #endif | |
64 | #ifdef PT_FP0 | |
65 | PT_FP0 * 4, PT_FP1 * 4, PT_FP2 * 4, PT_FP3 * 4, | |
66 | PT_FP4 * 4, PT_FP5 * 4, PT_FP6 * 4, PT_FP7 * 4, | |
67 | PT_FPCR * 4, PT_FPSR * 4, PT_FPIAR * 4 | |
68 | #else | |
69 | 21 * 4, 24 * 4, 27 * 4, 30 * 4, 33 * 4, 36 * 4, | |
70 | 39 * 4, 42 * 4, 45 * 4, 46 * 4, 47 * 4 | |
71 | #endif | |
72 | }; | |
73 | ||
2ec06d2e DJ |
74 | static int |
75 | m68k_cannot_store_register (int regno) | |
0a30fbc4 | 76 | { |
2ec06d2e | 77 | return (regno >= m68k_num_regs); |
0a30fbc4 DJ |
78 | } |
79 | ||
2ec06d2e DJ |
80 | static int |
81 | m68k_cannot_fetch_register (int regno) | |
0a30fbc4 | 82 | { |
2ec06d2e | 83 | return (regno >= m68k_num_regs); |
0a30fbc4 | 84 | } |
2ec06d2e | 85 | |
e9d25b98 | 86 | #ifdef HAVE_PTRACE_GETREGS |
db1d3e1b | 87 | #include <sys/procfs.h> |
5826e159 | 88 | #include "nat/gdb_ptrace.h" |
db1d3e1b AS |
89 | |
90 | static void | |
442ea881 | 91 | m68k_fill_gregset (struct regcache *regcache, void *buf) |
db1d3e1b AS |
92 | { |
93 | int i; | |
94 | ||
95 | for (i = 0; i < m68k_num_gregs; i++) | |
442ea881 | 96 | collect_register (regcache, i, (char *) buf + m68k_regmap[i]); |
db1d3e1b AS |
97 | } |
98 | ||
99 | static void | |
442ea881 | 100 | m68k_store_gregset (struct regcache *regcache, const void *buf) |
db1d3e1b AS |
101 | { |
102 | int i; | |
103 | ||
104 | for (i = 0; i < m68k_num_gregs; i++) | |
442ea881 | 105 | supply_register (regcache, i, (const char *) buf + m68k_regmap[i]); |
db1d3e1b AS |
106 | } |
107 | ||
108 | static void | |
442ea881 | 109 | m68k_fill_fpregset (struct regcache *regcache, void *buf) |
db1d3e1b AS |
110 | { |
111 | int i; | |
112 | ||
113 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) | |
442ea881 PA |
114 | collect_register (regcache, i, ((char *) buf |
115 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); | |
db1d3e1b AS |
116 | } |
117 | ||
118 | static void | |
442ea881 | 119 | m68k_store_fpregset (struct regcache *regcache, const void *buf) |
db1d3e1b AS |
120 | { |
121 | int i; | |
122 | ||
123 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) | |
442ea881 | 124 | supply_register (regcache, i, ((const char *) buf |
db1d3e1b AS |
125 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); |
126 | } | |
127 | ||
e9d25b98 | 128 | #endif /* HAVE_PTRACE_GETREGS */ |
db1d3e1b | 129 | |
3aee8918 | 130 | static struct regset_info m68k_regsets[] = { |
e9d25b98 | 131 | #ifdef HAVE_PTRACE_GETREGS |
1570b33e | 132 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
db1d3e1b AS |
133 | GENERAL_REGS, |
134 | m68k_fill_gregset, m68k_store_gregset }, | |
1570b33e | 135 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (elf_fpregset_t), |
db1d3e1b AS |
136 | FP_REGS, |
137 | m68k_fill_fpregset, m68k_store_fpregset }, | |
e9d25b98 | 138 | #endif /* HAVE_PTRACE_GETREGS */ |
50bc912a | 139 | NULL_REGSET |
db1d3e1b AS |
140 | }; |
141 | ||
dd373349 | 142 | static const gdb_byte m68k_breakpoint[] = { 0x4E, 0x4F }; |
db1d3e1b AS |
143 | #define m68k_breakpoint_len 2 |
144 | ||
dd373349 AT |
145 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
146 | ||
147 | static const gdb_byte * | |
148 | m68k_sw_breakpoint_from_kind (int kind, int *size) | |
149 | { | |
150 | *size = m68k_breakpoint_len; | |
151 | return m68k_breakpoint; | |
152 | } | |
153 | ||
db1d3e1b AS |
154 | static int |
155 | m68k_breakpoint_at (CORE_ADDR pc) | |
156 | { | |
157 | unsigned char c[2]; | |
158 | ||
159 | read_inferior_memory (pc, c, 2); | |
160 | if (c[0] == 0x4E && c[1] == 0x4F) | |
161 | return 1; | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
fea36a59 MK |
166 | #include <asm/ptrace.h> |
167 | ||
28d3cf85 | 168 | #ifdef PTRACE_GET_THREAD_AREA |
fea36a59 MK |
169 | /* Fetch the thread-local storage pointer for libthread_db. */ |
170 | ||
171 | ps_err_e | |
754653a7 | 172 | ps_get_thread_area (struct ps_prochandle *ph, |
fea36a59 MK |
173 | lwpid_t lwpid, int idx, void **base) |
174 | { | |
175 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | |
176 | return PS_ERR; | |
177 | ||
178 | /* IDX is the bias from the thread pointer to the beginning of the | |
179 | thread descriptor. It has to be subtracted due to implementation | |
180 | quirks in libthread_db. */ | |
181 | *base = (void *) ((char *)*base - idx); | |
182 | ||
183 | return PS_OK; | |
184 | } | |
28d3cf85 | 185 | #endif /* PTRACE_GET_THREAD_AREA */ |
fea36a59 | 186 | |
3aee8918 PA |
187 | static struct regsets_info m68k_regsets_info = |
188 | { | |
189 | m68k_regsets, /* regsets */ | |
190 | 0, /* num_regsets */ | |
191 | NULL, /* disabled_regsets */ | |
192 | }; | |
193 | ||
194 | static struct usrregs_info m68k_usrregs_info = | |
195 | { | |
196 | m68k_num_regs, | |
197 | m68k_regmap, | |
198 | }; | |
199 | ||
aa8d21c9 | 200 | static struct regs_info myregs_info = |
3aee8918 PA |
201 | { |
202 | NULL, /* regset_bitmap */ | |
203 | &m68k_usrregs_info, | |
204 | &m68k_regsets_info | |
205 | }; | |
206 | ||
aa8d21c9 TBA |
207 | const regs_info * |
208 | m68k_target::get_regs_info () | |
3aee8918 | 209 | { |
aa8d21c9 | 210 | return &myregs_info; |
3aee8918 PA |
211 | } |
212 | ||
797bcff5 TBA |
213 | void |
214 | m68k_target::low_arch_setup () | |
3aee8918 PA |
215 | { |
216 | current_process ()->tdesc = tdesc_m68k; | |
217 | } | |
218 | ||
5616b6c3 AS |
219 | /* Support for hardware single step. */ |
220 | ||
221 | static int | |
222 | m68k_supports_hardware_single_step (void) | |
223 | { | |
224 | return 1; | |
225 | } | |
226 | ||
2ec06d2e | 227 | struct linux_target_ops the_low_target = { |
2ec06d2e DJ |
228 | m68k_cannot_fetch_register, |
229 | m68k_cannot_store_register, | |
c14dfd32 | 230 | NULL, /* fetch_register */ |
276d4552 YQ |
231 | linux_get_pc_32bit, |
232 | linux_set_pc_32bit, | |
dd373349 AT |
233 | NULL, /* breakpoint_kind_from_pc */ |
234 | m68k_sw_breakpoint_from_kind, | |
db1d3e1b AS |
235 | NULL, |
236 | 2, | |
237 | m68k_breakpoint_at, | |
5616b6c3 AS |
238 | NULL, /* supports_z_point_type */ |
239 | NULL, /* insert_point */ | |
240 | NULL, /* remove_point */ | |
241 | NULL, /* stopped_by_watchpoint */ | |
242 | NULL, /* stopped_data_address */ | |
243 | NULL, /* collect_ptrace_register */ | |
244 | NULL, /* supply_ptrace_register */ | |
245 | NULL, /* siginfo_fixup */ | |
246 | NULL, /* new_process */ | |
247 | NULL, /* delete_process */ | |
248 | NULL, /* new_thread */ | |
249 | NULL, /* delete_thread */ | |
250 | NULL, /* new_fork */ | |
251 | NULL, /* prepare_to_resume */ | |
252 | NULL, /* process_qsupported */ | |
253 | NULL, /* supports_tracepoints */ | |
254 | NULL, /* get_thread_area */ | |
255 | NULL, /* install_fast_tracepoint_jump_pad */ | |
256 | NULL, /* emit_ops */ | |
257 | NULL, /* get_min_fast_tracepoint_insn_len */ | |
258 | NULL, /* supports_range_stepping */ | |
259 | NULL, /* breakpoint_kind_from_current_state */ | |
260 | m68k_supports_hardware_single_step, | |
2ec06d2e | 261 | }; |
3aee8918 | 262 | |
ef0478f6 TBA |
263 | /* The linux target ops object. */ |
264 | ||
265 | linux_process_target *the_linux_target = &the_m68k_target; | |
266 | ||
3aee8918 PA |
267 | void |
268 | initialize_low_arch (void) | |
269 | { | |
270 | /* Initialize the Linux target descriptions. */ | |
271 | init_registers_m68k (); | |
272 | ||
273 | initialize_regsets_info (&m68k_regsets_info); | |
274 | } |