Commit | Line | Data |
---|---|---|
0a30fbc4 | 1 | /* GNU/Linux/m68k specific low level interface, for the remote server for GDB. |
32d0add0 | 2 | Copyright (C) 1995-2015 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 | |
d05b4ac3 UW |
22 | /* Defined in auto-generated file reg-m68k.c. */ |
23 | void init_registers_m68k (void); | |
3aee8918 | 24 | extern const struct target_desc *tdesc_m68k; |
d05b4ac3 | 25 | |
0a30fbc4 DJ |
26 | #ifdef HAVE_SYS_REG_H |
27 | #include <sys/reg.h> | |
28 | #endif | |
29 | ||
4c0711e0 | 30 | #define m68k_num_regs 29 |
db1d3e1b | 31 | #define m68k_num_gregs 18 |
0a30fbc4 DJ |
32 | |
33 | /* This table must line up with REGISTER_NAMES in tm-m68k.h */ | |
2ec06d2e | 34 | static int m68k_regmap[] = |
0a30fbc4 DJ |
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 | ||
2ec06d2e DJ |
57 | static int |
58 | m68k_cannot_store_register (int regno) | |
0a30fbc4 | 59 | { |
2ec06d2e | 60 | return (regno >= m68k_num_regs); |
0a30fbc4 DJ |
61 | } |
62 | ||
2ec06d2e DJ |
63 | static int |
64 | m68k_cannot_fetch_register (int regno) | |
0a30fbc4 | 65 | { |
2ec06d2e | 66 | return (regno >= m68k_num_regs); |
0a30fbc4 | 67 | } |
2ec06d2e | 68 | |
e9d25b98 | 69 | #ifdef HAVE_PTRACE_GETREGS |
db1d3e1b | 70 | #include <sys/procfs.h> |
5826e159 | 71 | #include "nat/gdb_ptrace.h" |
db1d3e1b AS |
72 | |
73 | static void | |
442ea881 | 74 | m68k_fill_gregset (struct regcache *regcache, void *buf) |
db1d3e1b AS |
75 | { |
76 | int i; | |
77 | ||
78 | for (i = 0; i < m68k_num_gregs; i++) | |
442ea881 | 79 | collect_register (regcache, i, (char *) buf + m68k_regmap[i]); |
db1d3e1b AS |
80 | } |
81 | ||
82 | static void | |
442ea881 | 83 | m68k_store_gregset (struct regcache *regcache, const void *buf) |
db1d3e1b AS |
84 | { |
85 | int i; | |
86 | ||
87 | for (i = 0; i < m68k_num_gregs; i++) | |
442ea881 | 88 | supply_register (regcache, i, (const char *) buf + m68k_regmap[i]); |
db1d3e1b AS |
89 | } |
90 | ||
91 | static void | |
442ea881 | 92 | m68k_fill_fpregset (struct regcache *regcache, void *buf) |
db1d3e1b AS |
93 | { |
94 | int i; | |
95 | ||
96 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) | |
442ea881 PA |
97 | collect_register (regcache, i, ((char *) buf |
98 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); | |
db1d3e1b AS |
99 | } |
100 | ||
101 | static void | |
442ea881 | 102 | m68k_store_fpregset (struct regcache *regcache, const void *buf) |
db1d3e1b AS |
103 | { |
104 | int i; | |
105 | ||
106 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) | |
442ea881 | 107 | supply_register (regcache, i, ((const char *) buf |
db1d3e1b AS |
108 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); |
109 | } | |
110 | ||
e9d25b98 | 111 | #endif /* HAVE_PTRACE_GETREGS */ |
db1d3e1b | 112 | |
3aee8918 | 113 | static struct regset_info m68k_regsets[] = { |
e9d25b98 | 114 | #ifdef HAVE_PTRACE_GETREGS |
1570b33e | 115 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
db1d3e1b AS |
116 | GENERAL_REGS, |
117 | m68k_fill_gregset, m68k_store_gregset }, | |
1570b33e | 118 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (elf_fpregset_t), |
db1d3e1b AS |
119 | FP_REGS, |
120 | m68k_fill_fpregset, m68k_store_fpregset }, | |
e9d25b98 | 121 | #endif /* HAVE_PTRACE_GETREGS */ |
1570b33e | 122 | { 0, 0, 0, -1, -1, NULL, NULL } |
db1d3e1b AS |
123 | }; |
124 | ||
f450004a | 125 | static const unsigned char m68k_breakpoint[] = { 0x4E, 0x4F }; |
db1d3e1b AS |
126 | #define m68k_breakpoint_len 2 |
127 | ||
128 | static CORE_ADDR | |
442ea881 | 129 | m68k_get_pc (struct regcache *regcache) |
db1d3e1b AS |
130 | { |
131 | unsigned long pc; | |
132 | ||
442ea881 | 133 | collect_register_by_name (regcache, "pc", &pc); |
db1d3e1b AS |
134 | return pc; |
135 | } | |
136 | ||
137 | static void | |
442ea881 | 138 | m68k_set_pc (struct regcache *regcache, CORE_ADDR value) |
db1d3e1b AS |
139 | { |
140 | unsigned long newpc = value; | |
141 | ||
442ea881 | 142 | supply_register_by_name (regcache, "pc", &newpc); |
db1d3e1b AS |
143 | } |
144 | ||
145 | static int | |
146 | m68k_breakpoint_at (CORE_ADDR pc) | |
147 | { | |
148 | unsigned char c[2]; | |
149 | ||
150 | read_inferior_memory (pc, c, 2); | |
151 | if (c[0] == 0x4E && c[1] == 0x4F) | |
152 | return 1; | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
fea36a59 MK |
157 | #include <asm/ptrace.h> |
158 | ||
28d3cf85 | 159 | #ifdef PTRACE_GET_THREAD_AREA |
fea36a59 MK |
160 | /* Fetch the thread-local storage pointer for libthread_db. */ |
161 | ||
162 | ps_err_e | |
163 | ps_get_thread_area (const struct ps_prochandle *ph, | |
164 | lwpid_t lwpid, int idx, void **base) | |
165 | { | |
166 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | |
167 | return PS_ERR; | |
168 | ||
169 | /* IDX is the bias from the thread pointer to the beginning of the | |
170 | thread descriptor. It has to be subtracted due to implementation | |
171 | quirks in libthread_db. */ | |
172 | *base = (void *) ((char *)*base - idx); | |
173 | ||
174 | return PS_OK; | |
175 | } | |
28d3cf85 | 176 | #endif /* PTRACE_GET_THREAD_AREA */ |
fea36a59 | 177 | |
3aee8918 PA |
178 | static struct regsets_info m68k_regsets_info = |
179 | { | |
180 | m68k_regsets, /* regsets */ | |
181 | 0, /* num_regsets */ | |
182 | NULL, /* disabled_regsets */ | |
183 | }; | |
184 | ||
185 | static struct usrregs_info m68k_usrregs_info = | |
186 | { | |
187 | m68k_num_regs, | |
188 | m68k_regmap, | |
189 | }; | |
190 | ||
191 | static struct regs_info regs_info = | |
192 | { | |
193 | NULL, /* regset_bitmap */ | |
194 | &m68k_usrregs_info, | |
195 | &m68k_regsets_info | |
196 | }; | |
197 | ||
198 | static const struct regs_info * | |
199 | m68k_regs_info (void) | |
200 | { | |
201 | return ®s_info; | |
202 | } | |
203 | ||
204 | static void | |
205 | m68k_arch_setup (void) | |
206 | { | |
207 | current_process ()->tdesc = tdesc_m68k; | |
208 | } | |
209 | ||
2ec06d2e | 210 | struct linux_target_ops the_low_target = { |
3aee8918 PA |
211 | m68k_arch_setup, |
212 | m68k_regs_info, | |
2ec06d2e DJ |
213 | m68k_cannot_fetch_register, |
214 | m68k_cannot_store_register, | |
c14dfd32 | 215 | NULL, /* fetch_register */ |
db1d3e1b AS |
216 | m68k_get_pc, |
217 | m68k_set_pc, | |
218 | m68k_breakpoint, | |
219 | m68k_breakpoint_len, | |
220 | NULL, | |
221 | 2, | |
222 | m68k_breakpoint_at, | |
2ec06d2e | 223 | }; |
3aee8918 PA |
224 | |
225 | void | |
226 | initialize_low_arch (void) | |
227 | { | |
228 | /* Initialize the Linux target descriptions. */ | |
229 | init_registers_m68k (); | |
230 | ||
231 | initialize_regsets_info (&m68k_regsets_info); | |
232 | } |