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 | ||
3ca4edb6 TBA |
30 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; |
31 | ||
797bcff5 TBA |
32 | protected: |
33 | ||
34 | void low_arch_setup () override; | |
daca57a7 TBA |
35 | |
36 | bool low_cannot_fetch_register (int regno) override; | |
37 | ||
38 | bool low_cannot_store_register (int regno) override; | |
bf9ae9d8 TBA |
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; | |
d4807ea2 TBA |
45 | |
46 | int low_decr_pc_after_break () override; | |
d7146cda TBA |
47 | |
48 | bool low_breakpoint_at (CORE_ADDR pc) override; | |
ef0478f6 TBA |
49 | }; |
50 | ||
51 | /* The singleton target ops object. */ | |
52 | ||
53 | static m68k_target the_m68k_target; | |
54 | ||
bf9ae9d8 TBA |
55 | bool |
56 | m68k_target::low_supports_breakpoints () | |
57 | { | |
58 | return true; | |
59 | } | |
60 | ||
61 | CORE_ADDR | |
62 | m68k_target::low_get_pc (regcache *regcache) | |
63 | { | |
64 | return linux_get_pc_32bit (regcache); | |
65 | } | |
66 | ||
67 | void | |
68 | m68k_target::low_set_pc (regcache *regcache, CORE_ADDR pc) | |
69 | { | |
70 | linux_set_pc_32bit (regcache, pc); | |
71 | } | |
72 | ||
d4807ea2 TBA |
73 | int |
74 | m68k_target::low_decr_pc_after_break () | |
75 | { | |
76 | return 2; | |
77 | } | |
78 | ||
d05b4ac3 UW |
79 | /* Defined in auto-generated file reg-m68k.c. */ |
80 | void init_registers_m68k (void); | |
3aee8918 | 81 | extern const struct target_desc *tdesc_m68k; |
d05b4ac3 | 82 | |
0a30fbc4 DJ |
83 | #ifdef HAVE_SYS_REG_H |
84 | #include <sys/reg.h> | |
85 | #endif | |
86 | ||
4c0711e0 | 87 | #define m68k_num_regs 29 |
db1d3e1b | 88 | #define m68k_num_gregs 18 |
0a30fbc4 DJ |
89 | |
90 | /* This table must line up with REGISTER_NAMES in tm-m68k.h */ | |
2ec06d2e | 91 | static int m68k_regmap[] = |
0a30fbc4 DJ |
92 | { |
93 | #ifdef PT_D0 | |
94 | PT_D0 * 4, PT_D1 * 4, PT_D2 * 4, PT_D3 * 4, | |
95 | PT_D4 * 4, PT_D5 * 4, PT_D6 * 4, PT_D7 * 4, | |
96 | PT_A0 * 4, PT_A1 * 4, PT_A2 * 4, PT_A3 * 4, | |
97 | PT_A4 * 4, PT_A5 * 4, PT_A6 * 4, PT_USP * 4, | |
98 | PT_SR * 4, PT_PC * 4, | |
99 | #else | |
100 | 14 * 4, 0 * 4, 1 * 4, 2 * 4, 3 * 4, 4 * 4, 5 * 4, 6 * 4, | |
101 | 7 * 4, 8 * 4, 9 * 4, 10 * 4, 11 * 4, 12 * 4, 13 * 4, 15 * 4, | |
102 | 17 * 4, 18 * 4, | |
103 | #endif | |
104 | #ifdef PT_FP0 | |
105 | PT_FP0 * 4, PT_FP1 * 4, PT_FP2 * 4, PT_FP3 * 4, | |
106 | PT_FP4 * 4, PT_FP5 * 4, PT_FP6 * 4, PT_FP7 * 4, | |
107 | PT_FPCR * 4, PT_FPSR * 4, PT_FPIAR * 4 | |
108 | #else | |
109 | 21 * 4, 24 * 4, 27 * 4, 30 * 4, 33 * 4, 36 * 4, | |
110 | 39 * 4, 42 * 4, 45 * 4, 46 * 4, 47 * 4 | |
111 | #endif | |
112 | }; | |
113 | ||
daca57a7 TBA |
114 | bool |
115 | m68k_target::low_cannot_store_register (int regno) | |
0a30fbc4 | 116 | { |
2ec06d2e | 117 | return (regno >= m68k_num_regs); |
0a30fbc4 DJ |
118 | } |
119 | ||
daca57a7 TBA |
120 | bool |
121 | m68k_target::low_cannot_fetch_register (int regno) | |
0a30fbc4 | 122 | { |
2ec06d2e | 123 | return (regno >= m68k_num_regs); |
0a30fbc4 | 124 | } |
2ec06d2e | 125 | |
e9d25b98 | 126 | #ifdef HAVE_PTRACE_GETREGS |
db1d3e1b | 127 | #include <sys/procfs.h> |
5826e159 | 128 | #include "nat/gdb_ptrace.h" |
db1d3e1b AS |
129 | |
130 | static void | |
442ea881 | 131 | m68k_fill_gregset (struct regcache *regcache, void *buf) |
db1d3e1b AS |
132 | { |
133 | int i; | |
134 | ||
135 | for (i = 0; i < m68k_num_gregs; i++) | |
442ea881 | 136 | collect_register (regcache, i, (char *) buf + m68k_regmap[i]); |
db1d3e1b AS |
137 | } |
138 | ||
139 | static void | |
442ea881 | 140 | m68k_store_gregset (struct regcache *regcache, const void *buf) |
db1d3e1b AS |
141 | { |
142 | int i; | |
143 | ||
144 | for (i = 0; i < m68k_num_gregs; i++) | |
442ea881 | 145 | supply_register (regcache, i, (const char *) buf + m68k_regmap[i]); |
db1d3e1b AS |
146 | } |
147 | ||
148 | static void | |
442ea881 | 149 | m68k_fill_fpregset (struct regcache *regcache, void *buf) |
db1d3e1b AS |
150 | { |
151 | int i; | |
152 | ||
153 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) | |
442ea881 PA |
154 | collect_register (regcache, i, ((char *) buf |
155 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); | |
db1d3e1b AS |
156 | } |
157 | ||
158 | static void | |
442ea881 | 159 | m68k_store_fpregset (struct regcache *regcache, const void *buf) |
db1d3e1b AS |
160 | { |
161 | int i; | |
162 | ||
163 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) | |
442ea881 | 164 | supply_register (regcache, i, ((const char *) buf |
db1d3e1b AS |
165 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); |
166 | } | |
167 | ||
e9d25b98 | 168 | #endif /* HAVE_PTRACE_GETREGS */ |
db1d3e1b | 169 | |
3aee8918 | 170 | static struct regset_info m68k_regsets[] = { |
e9d25b98 | 171 | #ifdef HAVE_PTRACE_GETREGS |
1570b33e | 172 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
db1d3e1b AS |
173 | GENERAL_REGS, |
174 | m68k_fill_gregset, m68k_store_gregset }, | |
1570b33e | 175 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (elf_fpregset_t), |
db1d3e1b AS |
176 | FP_REGS, |
177 | m68k_fill_fpregset, m68k_store_fpregset }, | |
e9d25b98 | 178 | #endif /* HAVE_PTRACE_GETREGS */ |
50bc912a | 179 | NULL_REGSET |
db1d3e1b AS |
180 | }; |
181 | ||
dd373349 | 182 | static const gdb_byte m68k_breakpoint[] = { 0x4E, 0x4F }; |
db1d3e1b AS |
183 | #define m68k_breakpoint_len 2 |
184 | ||
3ca4edb6 | 185 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ |
dd373349 | 186 | |
3ca4edb6 TBA |
187 | const gdb_byte * |
188 | m68k_target::sw_breakpoint_from_kind (int kind, int *size) | |
dd373349 AT |
189 | { |
190 | *size = m68k_breakpoint_len; | |
191 | return m68k_breakpoint; | |
192 | } | |
193 | ||
d7146cda TBA |
194 | bool |
195 | m68k_target::low_breakpoint_at (CORE_ADDR pc) | |
db1d3e1b AS |
196 | { |
197 | unsigned char c[2]; | |
198 | ||
199 | read_inferior_memory (pc, c, 2); | |
200 | if (c[0] == 0x4E && c[1] == 0x4F) | |
d7146cda | 201 | return true; |
db1d3e1b | 202 | |
d7146cda | 203 | return false; |
db1d3e1b AS |
204 | } |
205 | ||
fea36a59 MK |
206 | #include <asm/ptrace.h> |
207 | ||
28d3cf85 | 208 | #ifdef PTRACE_GET_THREAD_AREA |
fea36a59 MK |
209 | /* Fetch the thread-local storage pointer for libthread_db. */ |
210 | ||
211 | ps_err_e | |
754653a7 | 212 | ps_get_thread_area (struct ps_prochandle *ph, |
fea36a59 MK |
213 | lwpid_t lwpid, int idx, void **base) |
214 | { | |
215 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | |
216 | return PS_ERR; | |
217 | ||
218 | /* IDX is the bias from the thread pointer to the beginning of the | |
219 | thread descriptor. It has to be subtracted due to implementation | |
220 | quirks in libthread_db. */ | |
221 | *base = (void *) ((char *)*base - idx); | |
222 | ||
223 | return PS_OK; | |
224 | } | |
28d3cf85 | 225 | #endif /* PTRACE_GET_THREAD_AREA */ |
fea36a59 | 226 | |
3aee8918 PA |
227 | static struct regsets_info m68k_regsets_info = |
228 | { | |
229 | m68k_regsets, /* regsets */ | |
230 | 0, /* num_regsets */ | |
231 | NULL, /* disabled_regsets */ | |
232 | }; | |
233 | ||
234 | static struct usrregs_info m68k_usrregs_info = | |
235 | { | |
236 | m68k_num_regs, | |
237 | m68k_regmap, | |
238 | }; | |
239 | ||
aa8d21c9 | 240 | static struct regs_info myregs_info = |
3aee8918 PA |
241 | { |
242 | NULL, /* regset_bitmap */ | |
243 | &m68k_usrregs_info, | |
244 | &m68k_regsets_info | |
245 | }; | |
246 | ||
aa8d21c9 TBA |
247 | const regs_info * |
248 | m68k_target::get_regs_info () | |
3aee8918 | 249 | { |
aa8d21c9 | 250 | return &myregs_info; |
3aee8918 PA |
251 | } |
252 | ||
797bcff5 TBA |
253 | void |
254 | m68k_target::low_arch_setup () | |
3aee8918 PA |
255 | { |
256 | current_process ()->tdesc = tdesc_m68k; | |
257 | } | |
258 | ||
ef0478f6 TBA |
259 | /* The linux target ops object. */ |
260 | ||
261 | linux_process_target *the_linux_target = &the_m68k_target; | |
262 | ||
3aee8918 PA |
263 | void |
264 | initialize_low_arch (void) | |
265 | { | |
266 | /* Initialize the Linux target descriptions. */ | |
267 | init_registers_m68k (); | |
268 | ||
269 | initialize_regsets_info (&m68k_regsets_info); | |
270 | } |