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 | ||
aa8d21c9 TBA |
28 | const regs_info *get_regs_info () override; |
29 | ||
797bcff5 TBA |
30 | protected: |
31 | ||
32 | void low_arch_setup () override; | |
daca57a7 TBA |
33 | |
34 | bool low_cannot_fetch_register (int regno) override; | |
35 | ||
36 | bool low_cannot_store_register (int regno) override; | |
ef0478f6 TBA |
37 | }; |
38 | ||
39 | /* The singleton target ops object. */ | |
40 | ||
41 | static m68k_target the_m68k_target; | |
42 | ||
d05b4ac3 UW |
43 | /* Defined in auto-generated file reg-m68k.c. */ |
44 | void init_registers_m68k (void); | |
3aee8918 | 45 | extern const struct target_desc *tdesc_m68k; |
d05b4ac3 | 46 | |
0a30fbc4 DJ |
47 | #ifdef HAVE_SYS_REG_H |
48 | #include <sys/reg.h> | |
49 | #endif | |
50 | ||
4c0711e0 | 51 | #define m68k_num_regs 29 |
db1d3e1b | 52 | #define m68k_num_gregs 18 |
0a30fbc4 DJ |
53 | |
54 | /* This table must line up with REGISTER_NAMES in tm-m68k.h */ | |
2ec06d2e | 55 | static int m68k_regmap[] = |
0a30fbc4 DJ |
56 | { |
57 | #ifdef PT_D0 | |
58 | PT_D0 * 4, PT_D1 * 4, PT_D2 * 4, PT_D3 * 4, | |
59 | PT_D4 * 4, PT_D5 * 4, PT_D6 * 4, PT_D7 * 4, | |
60 | PT_A0 * 4, PT_A1 * 4, PT_A2 * 4, PT_A3 * 4, | |
61 | PT_A4 * 4, PT_A5 * 4, PT_A6 * 4, PT_USP * 4, | |
62 | PT_SR * 4, PT_PC * 4, | |
63 | #else | |
64 | 14 * 4, 0 * 4, 1 * 4, 2 * 4, 3 * 4, 4 * 4, 5 * 4, 6 * 4, | |
65 | 7 * 4, 8 * 4, 9 * 4, 10 * 4, 11 * 4, 12 * 4, 13 * 4, 15 * 4, | |
66 | 17 * 4, 18 * 4, | |
67 | #endif | |
68 | #ifdef PT_FP0 | |
69 | PT_FP0 * 4, PT_FP1 * 4, PT_FP2 * 4, PT_FP3 * 4, | |
70 | PT_FP4 * 4, PT_FP5 * 4, PT_FP6 * 4, PT_FP7 * 4, | |
71 | PT_FPCR * 4, PT_FPSR * 4, PT_FPIAR * 4 | |
72 | #else | |
73 | 21 * 4, 24 * 4, 27 * 4, 30 * 4, 33 * 4, 36 * 4, | |
74 | 39 * 4, 42 * 4, 45 * 4, 46 * 4, 47 * 4 | |
75 | #endif | |
76 | }; | |
77 | ||
daca57a7 TBA |
78 | bool |
79 | m68k_target::low_cannot_store_register (int regno) | |
0a30fbc4 | 80 | { |
2ec06d2e | 81 | return (regno >= m68k_num_regs); |
0a30fbc4 DJ |
82 | } |
83 | ||
daca57a7 TBA |
84 | bool |
85 | m68k_target::low_cannot_fetch_register (int regno) | |
0a30fbc4 | 86 | { |
2ec06d2e | 87 | return (regno >= m68k_num_regs); |
0a30fbc4 | 88 | } |
2ec06d2e | 89 | |
e9d25b98 | 90 | #ifdef HAVE_PTRACE_GETREGS |
db1d3e1b | 91 | #include <sys/procfs.h> |
5826e159 | 92 | #include "nat/gdb_ptrace.h" |
db1d3e1b AS |
93 | |
94 | static void | |
442ea881 | 95 | m68k_fill_gregset (struct regcache *regcache, void *buf) |
db1d3e1b AS |
96 | { |
97 | int i; | |
98 | ||
99 | for (i = 0; i < m68k_num_gregs; i++) | |
442ea881 | 100 | collect_register (regcache, i, (char *) buf + m68k_regmap[i]); |
db1d3e1b AS |
101 | } |
102 | ||
103 | static void | |
442ea881 | 104 | m68k_store_gregset (struct regcache *regcache, const void *buf) |
db1d3e1b AS |
105 | { |
106 | int i; | |
107 | ||
108 | for (i = 0; i < m68k_num_gregs; i++) | |
442ea881 | 109 | supply_register (regcache, i, (const char *) buf + m68k_regmap[i]); |
db1d3e1b AS |
110 | } |
111 | ||
112 | static void | |
442ea881 | 113 | m68k_fill_fpregset (struct regcache *regcache, void *buf) |
db1d3e1b AS |
114 | { |
115 | int i; | |
116 | ||
117 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) | |
442ea881 PA |
118 | collect_register (regcache, i, ((char *) buf |
119 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); | |
db1d3e1b AS |
120 | } |
121 | ||
122 | static void | |
442ea881 | 123 | m68k_store_fpregset (struct regcache *regcache, const void *buf) |
db1d3e1b AS |
124 | { |
125 | int i; | |
126 | ||
127 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) | |
442ea881 | 128 | supply_register (regcache, i, ((const char *) buf |
db1d3e1b AS |
129 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); |
130 | } | |
131 | ||
e9d25b98 | 132 | #endif /* HAVE_PTRACE_GETREGS */ |
db1d3e1b | 133 | |
3aee8918 | 134 | static struct regset_info m68k_regsets[] = { |
e9d25b98 | 135 | #ifdef HAVE_PTRACE_GETREGS |
1570b33e | 136 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
db1d3e1b AS |
137 | GENERAL_REGS, |
138 | m68k_fill_gregset, m68k_store_gregset }, | |
1570b33e | 139 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (elf_fpregset_t), |
db1d3e1b AS |
140 | FP_REGS, |
141 | m68k_fill_fpregset, m68k_store_fpregset }, | |
e9d25b98 | 142 | #endif /* HAVE_PTRACE_GETREGS */ |
50bc912a | 143 | NULL_REGSET |
db1d3e1b AS |
144 | }; |
145 | ||
dd373349 | 146 | static const gdb_byte m68k_breakpoint[] = { 0x4E, 0x4F }; |
db1d3e1b AS |
147 | #define m68k_breakpoint_len 2 |
148 | ||
dd373349 AT |
149 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
150 | ||
151 | static const gdb_byte * | |
152 | m68k_sw_breakpoint_from_kind (int kind, int *size) | |
153 | { | |
154 | *size = m68k_breakpoint_len; | |
155 | return m68k_breakpoint; | |
156 | } | |
157 | ||
db1d3e1b AS |
158 | static int |
159 | m68k_breakpoint_at (CORE_ADDR pc) | |
160 | { | |
161 | unsigned char c[2]; | |
162 | ||
163 | read_inferior_memory (pc, c, 2); | |
164 | if (c[0] == 0x4E && c[1] == 0x4F) | |
165 | return 1; | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
fea36a59 MK |
170 | #include <asm/ptrace.h> |
171 | ||
28d3cf85 | 172 | #ifdef PTRACE_GET_THREAD_AREA |
fea36a59 MK |
173 | /* Fetch the thread-local storage pointer for libthread_db. */ |
174 | ||
175 | ps_err_e | |
754653a7 | 176 | ps_get_thread_area (struct ps_prochandle *ph, |
fea36a59 MK |
177 | lwpid_t lwpid, int idx, void **base) |
178 | { | |
179 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | |
180 | return PS_ERR; | |
181 | ||
182 | /* IDX is the bias from the thread pointer to the beginning of the | |
183 | thread descriptor. It has to be subtracted due to implementation | |
184 | quirks in libthread_db. */ | |
185 | *base = (void *) ((char *)*base - idx); | |
186 | ||
187 | return PS_OK; | |
188 | } | |
28d3cf85 | 189 | #endif /* PTRACE_GET_THREAD_AREA */ |
fea36a59 | 190 | |
3aee8918 PA |
191 | static struct regsets_info m68k_regsets_info = |
192 | { | |
193 | m68k_regsets, /* regsets */ | |
194 | 0, /* num_regsets */ | |
195 | NULL, /* disabled_regsets */ | |
196 | }; | |
197 | ||
198 | static struct usrregs_info m68k_usrregs_info = | |
199 | { | |
200 | m68k_num_regs, | |
201 | m68k_regmap, | |
202 | }; | |
203 | ||
aa8d21c9 | 204 | static struct regs_info myregs_info = |
3aee8918 PA |
205 | { |
206 | NULL, /* regset_bitmap */ | |
207 | &m68k_usrregs_info, | |
208 | &m68k_regsets_info | |
209 | }; | |
210 | ||
aa8d21c9 TBA |
211 | const regs_info * |
212 | m68k_target::get_regs_info () | |
3aee8918 | 213 | { |
aa8d21c9 | 214 | return &myregs_info; |
3aee8918 PA |
215 | } |
216 | ||
797bcff5 TBA |
217 | void |
218 | m68k_target::low_arch_setup () | |
3aee8918 PA |
219 | { |
220 | current_process ()->tdesc = tdesc_m68k; | |
221 | } | |
222 | ||
5616b6c3 AS |
223 | /* Support for hardware single step. */ |
224 | ||
225 | static int | |
226 | m68k_supports_hardware_single_step (void) | |
227 | { | |
228 | return 1; | |
229 | } | |
230 | ||
2ec06d2e | 231 | struct linux_target_ops the_low_target = { |
c14dfd32 | 232 | NULL, /* fetch_register */ |
276d4552 YQ |
233 | linux_get_pc_32bit, |
234 | linux_set_pc_32bit, | |
dd373349 AT |
235 | NULL, /* breakpoint_kind_from_pc */ |
236 | m68k_sw_breakpoint_from_kind, | |
db1d3e1b AS |
237 | NULL, |
238 | 2, | |
239 | m68k_breakpoint_at, | |
5616b6c3 AS |
240 | NULL, /* supports_z_point_type */ |
241 | NULL, /* insert_point */ | |
242 | NULL, /* remove_point */ | |
243 | NULL, /* stopped_by_watchpoint */ | |
244 | NULL, /* stopped_data_address */ | |
245 | NULL, /* collect_ptrace_register */ | |
246 | NULL, /* supply_ptrace_register */ | |
247 | NULL, /* siginfo_fixup */ | |
248 | NULL, /* new_process */ | |
249 | NULL, /* delete_process */ | |
250 | NULL, /* new_thread */ | |
251 | NULL, /* delete_thread */ | |
252 | NULL, /* new_fork */ | |
253 | NULL, /* prepare_to_resume */ | |
254 | NULL, /* process_qsupported */ | |
255 | NULL, /* supports_tracepoints */ | |
256 | NULL, /* get_thread_area */ | |
257 | NULL, /* install_fast_tracepoint_jump_pad */ | |
258 | NULL, /* emit_ops */ | |
259 | NULL, /* get_min_fast_tracepoint_insn_len */ | |
260 | NULL, /* supports_range_stepping */ | |
261 | NULL, /* breakpoint_kind_from_current_state */ | |
262 | m68k_supports_hardware_single_step, | |
2ec06d2e | 263 | }; |
3aee8918 | 264 | |
ef0478f6 TBA |
265 | /* The linux target ops object. */ |
266 | ||
267 | linux_process_target *the_linux_target = &the_m68k_target; | |
268 | ||
3aee8918 PA |
269 | void |
270 | initialize_low_arch (void) | |
271 | { | |
272 | /* Initialize the Linux target descriptions. */ | |
273 | init_registers_m68k (); | |
274 | ||
275 | initialize_regsets_info (&m68k_regsets_info); | |
276 | } |