Commit | Line | Data |
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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 | ||
797bcff5 TBA |
28 | protected: |
29 | ||
30 | void low_arch_setup () override; | |
ef0478f6 TBA |
31 | }; |
32 | ||
33 | /* The singleton target ops object. */ | |
34 | ||
35 | static m68k_target the_m68k_target; | |
36 | ||
d05b4ac3 UW |
37 | /* Defined in auto-generated file reg-m68k.c. */ |
38 | void init_registers_m68k (void); | |
3aee8918 | 39 | extern const struct target_desc *tdesc_m68k; |
d05b4ac3 | 40 | |
0a30fbc4 DJ |
41 | #ifdef HAVE_SYS_REG_H |
42 | #include <sys/reg.h> | |
43 | #endif | |
44 | ||
4c0711e0 | 45 | #define m68k_num_regs 29 |
db1d3e1b | 46 | #define m68k_num_gregs 18 |
0a30fbc4 DJ |
47 | |
48 | /* This table must line up with REGISTER_NAMES in tm-m68k.h */ | |
2ec06d2e | 49 | static int m68k_regmap[] = |
0a30fbc4 DJ |
50 | { |
51 | #ifdef PT_D0 | |
52 | PT_D0 * 4, PT_D1 * 4, PT_D2 * 4, PT_D3 * 4, | |
53 | PT_D4 * 4, PT_D5 * 4, PT_D6 * 4, PT_D7 * 4, | |
54 | PT_A0 * 4, PT_A1 * 4, PT_A2 * 4, PT_A3 * 4, | |
55 | PT_A4 * 4, PT_A5 * 4, PT_A6 * 4, PT_USP * 4, | |
56 | PT_SR * 4, PT_PC * 4, | |
57 | #else | |
58 | 14 * 4, 0 * 4, 1 * 4, 2 * 4, 3 * 4, 4 * 4, 5 * 4, 6 * 4, | |
59 | 7 * 4, 8 * 4, 9 * 4, 10 * 4, 11 * 4, 12 * 4, 13 * 4, 15 * 4, | |
60 | 17 * 4, 18 * 4, | |
61 | #endif | |
62 | #ifdef PT_FP0 | |
63 | PT_FP0 * 4, PT_FP1 * 4, PT_FP2 * 4, PT_FP3 * 4, | |
64 | PT_FP4 * 4, PT_FP5 * 4, PT_FP6 * 4, PT_FP7 * 4, | |
65 | PT_FPCR * 4, PT_FPSR * 4, PT_FPIAR * 4 | |
66 | #else | |
67 | 21 * 4, 24 * 4, 27 * 4, 30 * 4, 33 * 4, 36 * 4, | |
68 | 39 * 4, 42 * 4, 45 * 4, 46 * 4, 47 * 4 | |
69 | #endif | |
70 | }; | |
71 | ||
2ec06d2e DJ |
72 | static int |
73 | m68k_cannot_store_register (int regno) | |
0a30fbc4 | 74 | { |
2ec06d2e | 75 | return (regno >= m68k_num_regs); |
0a30fbc4 DJ |
76 | } |
77 | ||
2ec06d2e DJ |
78 | static int |
79 | m68k_cannot_fetch_register (int regno) | |
0a30fbc4 | 80 | { |
2ec06d2e | 81 | return (regno >= m68k_num_regs); |
0a30fbc4 | 82 | } |
2ec06d2e | 83 | |
e9d25b98 | 84 | #ifdef HAVE_PTRACE_GETREGS |
db1d3e1b | 85 | #include <sys/procfs.h> |
5826e159 | 86 | #include "nat/gdb_ptrace.h" |
db1d3e1b AS |
87 | |
88 | static void | |
442ea881 | 89 | m68k_fill_gregset (struct regcache *regcache, void *buf) |
db1d3e1b AS |
90 | { |
91 | int i; | |
92 | ||
93 | for (i = 0; i < m68k_num_gregs; i++) | |
442ea881 | 94 | collect_register (regcache, i, (char *) buf + m68k_regmap[i]); |
db1d3e1b AS |
95 | } |
96 | ||
97 | static void | |
442ea881 | 98 | m68k_store_gregset (struct regcache *regcache, const void *buf) |
db1d3e1b AS |
99 | { |
100 | int i; | |
101 | ||
102 | for (i = 0; i < m68k_num_gregs; i++) | |
442ea881 | 103 | supply_register (regcache, i, (const char *) buf + m68k_regmap[i]); |
db1d3e1b AS |
104 | } |
105 | ||
106 | static void | |
442ea881 | 107 | m68k_fill_fpregset (struct regcache *regcache, void *buf) |
db1d3e1b AS |
108 | { |
109 | int i; | |
110 | ||
111 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) | |
442ea881 PA |
112 | collect_register (regcache, i, ((char *) buf |
113 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); | |
db1d3e1b AS |
114 | } |
115 | ||
116 | static void | |
442ea881 | 117 | m68k_store_fpregset (struct regcache *regcache, const void *buf) |
db1d3e1b AS |
118 | { |
119 | int i; | |
120 | ||
121 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) | |
442ea881 | 122 | supply_register (regcache, i, ((const char *) buf |
db1d3e1b AS |
123 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); |
124 | } | |
125 | ||
e9d25b98 | 126 | #endif /* HAVE_PTRACE_GETREGS */ |
db1d3e1b | 127 | |
3aee8918 | 128 | static struct regset_info m68k_regsets[] = { |
e9d25b98 | 129 | #ifdef HAVE_PTRACE_GETREGS |
1570b33e | 130 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
db1d3e1b AS |
131 | GENERAL_REGS, |
132 | m68k_fill_gregset, m68k_store_gregset }, | |
1570b33e | 133 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (elf_fpregset_t), |
db1d3e1b AS |
134 | FP_REGS, |
135 | m68k_fill_fpregset, m68k_store_fpregset }, | |
e9d25b98 | 136 | #endif /* HAVE_PTRACE_GETREGS */ |
50bc912a | 137 | NULL_REGSET |
db1d3e1b AS |
138 | }; |
139 | ||
dd373349 | 140 | static const gdb_byte m68k_breakpoint[] = { 0x4E, 0x4F }; |
db1d3e1b AS |
141 | #define m68k_breakpoint_len 2 |
142 | ||
dd373349 AT |
143 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
144 | ||
145 | static const gdb_byte * | |
146 | m68k_sw_breakpoint_from_kind (int kind, int *size) | |
147 | { | |
148 | *size = m68k_breakpoint_len; | |
149 | return m68k_breakpoint; | |
150 | } | |
151 | ||
db1d3e1b AS |
152 | static int |
153 | m68k_breakpoint_at (CORE_ADDR pc) | |
154 | { | |
155 | unsigned char c[2]; | |
156 | ||
157 | read_inferior_memory (pc, c, 2); | |
158 | if (c[0] == 0x4E && c[1] == 0x4F) | |
159 | return 1; | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
fea36a59 MK |
164 | #include <asm/ptrace.h> |
165 | ||
28d3cf85 | 166 | #ifdef PTRACE_GET_THREAD_AREA |
fea36a59 MK |
167 | /* Fetch the thread-local storage pointer for libthread_db. */ |
168 | ||
169 | ps_err_e | |
754653a7 | 170 | ps_get_thread_area (struct ps_prochandle *ph, |
fea36a59 MK |
171 | lwpid_t lwpid, int idx, void **base) |
172 | { | |
173 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | |
174 | return PS_ERR; | |
175 | ||
176 | /* IDX is the bias from the thread pointer to the beginning of the | |
177 | thread descriptor. It has to be subtracted due to implementation | |
178 | quirks in libthread_db. */ | |
179 | *base = (void *) ((char *)*base - idx); | |
180 | ||
181 | return PS_OK; | |
182 | } | |
28d3cf85 | 183 | #endif /* PTRACE_GET_THREAD_AREA */ |
fea36a59 | 184 | |
3aee8918 PA |
185 | static struct regsets_info m68k_regsets_info = |
186 | { | |
187 | m68k_regsets, /* regsets */ | |
188 | 0, /* num_regsets */ | |
189 | NULL, /* disabled_regsets */ | |
190 | }; | |
191 | ||
192 | static struct usrregs_info m68k_usrregs_info = | |
193 | { | |
194 | m68k_num_regs, | |
195 | m68k_regmap, | |
196 | }; | |
197 | ||
198 | static struct regs_info regs_info = | |
199 | { | |
200 | NULL, /* regset_bitmap */ | |
201 | &m68k_usrregs_info, | |
202 | &m68k_regsets_info | |
203 | }; | |
204 | ||
205 | static const struct regs_info * | |
206 | m68k_regs_info (void) | |
207 | { | |
208 | return ®s_info; | |
209 | } | |
210 | ||
797bcff5 TBA |
211 | void |
212 | m68k_target::low_arch_setup () | |
3aee8918 PA |
213 | { |
214 | current_process ()->tdesc = tdesc_m68k; | |
215 | } | |
216 | ||
5616b6c3 AS |
217 | /* Support for hardware single step. */ |
218 | ||
219 | static int | |
220 | m68k_supports_hardware_single_step (void) | |
221 | { | |
222 | return 1; | |
223 | } | |
224 | ||
2ec06d2e | 225 | struct linux_target_ops the_low_target = { |
3aee8918 | 226 | m68k_regs_info, |
2ec06d2e DJ |
227 | m68k_cannot_fetch_register, |
228 | m68k_cannot_store_register, | |
c14dfd32 | 229 | NULL, /* fetch_register */ |
276d4552 YQ |
230 | linux_get_pc_32bit, |
231 | linux_set_pc_32bit, | |
dd373349 AT |
232 | NULL, /* breakpoint_kind_from_pc */ |
233 | m68k_sw_breakpoint_from_kind, | |
db1d3e1b AS |
234 | NULL, |
235 | 2, | |
236 | m68k_breakpoint_at, | |
5616b6c3 AS |
237 | NULL, /* supports_z_point_type */ |
238 | NULL, /* insert_point */ | |
239 | NULL, /* remove_point */ | |
240 | NULL, /* stopped_by_watchpoint */ | |
241 | NULL, /* stopped_data_address */ | |
242 | NULL, /* collect_ptrace_register */ | |
243 | NULL, /* supply_ptrace_register */ | |
244 | NULL, /* siginfo_fixup */ | |
245 | NULL, /* new_process */ | |
246 | NULL, /* delete_process */ | |
247 | NULL, /* new_thread */ | |
248 | NULL, /* delete_thread */ | |
249 | NULL, /* new_fork */ | |
250 | NULL, /* prepare_to_resume */ | |
251 | NULL, /* process_qsupported */ | |
252 | NULL, /* supports_tracepoints */ | |
253 | NULL, /* get_thread_area */ | |
254 | NULL, /* install_fast_tracepoint_jump_pad */ | |
255 | NULL, /* emit_ops */ | |
256 | NULL, /* get_min_fast_tracepoint_insn_len */ | |
257 | NULL, /* supports_range_stepping */ | |
258 | NULL, /* breakpoint_kind_from_current_state */ | |
259 | m68k_supports_hardware_single_step, | |
2ec06d2e | 260 | }; |
3aee8918 | 261 | |
ef0478f6 TBA |
262 | /* The linux target ops object. */ |
263 | ||
264 | linux_process_target *the_linux_target = &the_m68k_target; | |
265 | ||
3aee8918 PA |
266 | void |
267 | initialize_low_arch (void) | |
268 | { | |
269 | /* Initialize the Linux target descriptions. */ | |
270 | init_registers_m68k (); | |
271 | ||
272 | initialize_regsets_info (&m68k_regsets_info); | |
273 | } |