Commit | Line | Data |
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0a30fbc4 | 1 | /* GNU/Linux/m68k specific low level interface, for the remote server for GDB. |
28e7fd62 | 2 | Copyright (C) 1995-2013 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); | |
24 | ||
0a30fbc4 DJ |
25 | #ifdef HAVE_SYS_REG_H |
26 | #include <sys/reg.h> | |
27 | #endif | |
28 | ||
4c0711e0 | 29 | #define m68k_num_regs 29 |
db1d3e1b | 30 | #define m68k_num_gregs 18 |
0a30fbc4 DJ |
31 | |
32 | /* This table must line up with REGISTER_NAMES in tm-m68k.h */ | |
2ec06d2e | 33 | static int m68k_regmap[] = |
0a30fbc4 DJ |
34 | { |
35 | #ifdef PT_D0 | |
36 | PT_D0 * 4, PT_D1 * 4, PT_D2 * 4, PT_D3 * 4, | |
37 | PT_D4 * 4, PT_D5 * 4, PT_D6 * 4, PT_D7 * 4, | |
38 | PT_A0 * 4, PT_A1 * 4, PT_A2 * 4, PT_A3 * 4, | |
39 | PT_A4 * 4, PT_A5 * 4, PT_A6 * 4, PT_USP * 4, | |
40 | PT_SR * 4, PT_PC * 4, | |
41 | #else | |
42 | 14 * 4, 0 * 4, 1 * 4, 2 * 4, 3 * 4, 4 * 4, 5 * 4, 6 * 4, | |
43 | 7 * 4, 8 * 4, 9 * 4, 10 * 4, 11 * 4, 12 * 4, 13 * 4, 15 * 4, | |
44 | 17 * 4, 18 * 4, | |
45 | #endif | |
46 | #ifdef PT_FP0 | |
47 | PT_FP0 * 4, PT_FP1 * 4, PT_FP2 * 4, PT_FP3 * 4, | |
48 | PT_FP4 * 4, PT_FP5 * 4, PT_FP6 * 4, PT_FP7 * 4, | |
49 | PT_FPCR * 4, PT_FPSR * 4, PT_FPIAR * 4 | |
50 | #else | |
51 | 21 * 4, 24 * 4, 27 * 4, 30 * 4, 33 * 4, 36 * 4, | |
52 | 39 * 4, 42 * 4, 45 * 4, 46 * 4, 47 * 4 | |
53 | #endif | |
54 | }; | |
55 | ||
2ec06d2e DJ |
56 | static int |
57 | m68k_cannot_store_register (int regno) | |
0a30fbc4 | 58 | { |
2ec06d2e | 59 | return (regno >= m68k_num_regs); |
0a30fbc4 DJ |
60 | } |
61 | ||
2ec06d2e DJ |
62 | static int |
63 | m68k_cannot_fetch_register (int regno) | |
0a30fbc4 | 64 | { |
2ec06d2e | 65 | return (regno >= m68k_num_regs); |
0a30fbc4 | 66 | } |
2ec06d2e | 67 | |
e9d25b98 | 68 | #ifdef HAVE_PTRACE_GETREGS |
db1d3e1b AS |
69 | #include <sys/procfs.h> |
70 | #include <sys/ptrace.h> | |
71 | ||
72 | static void | |
442ea881 | 73 | m68k_fill_gregset (struct regcache *regcache, void *buf) |
db1d3e1b AS |
74 | { |
75 | int i; | |
76 | ||
77 | for (i = 0; i < m68k_num_gregs; i++) | |
442ea881 | 78 | collect_register (regcache, i, (char *) buf + m68k_regmap[i]); |
db1d3e1b AS |
79 | } |
80 | ||
81 | static void | |
442ea881 | 82 | m68k_store_gregset (struct regcache *regcache, const void *buf) |
db1d3e1b AS |
83 | { |
84 | int i; | |
85 | ||
86 | for (i = 0; i < m68k_num_gregs; i++) | |
442ea881 | 87 | supply_register (regcache, i, (const char *) buf + m68k_regmap[i]); |
db1d3e1b AS |
88 | } |
89 | ||
90 | static void | |
442ea881 | 91 | m68k_fill_fpregset (struct regcache *regcache, void *buf) |
db1d3e1b AS |
92 | { |
93 | int i; | |
94 | ||
95 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) | |
442ea881 PA |
96 | collect_register (regcache, i, ((char *) buf |
97 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); | |
db1d3e1b AS |
98 | } |
99 | ||
100 | static void | |
442ea881 | 101 | m68k_store_fpregset (struct regcache *regcache, const void *buf) |
db1d3e1b AS |
102 | { |
103 | int i; | |
104 | ||
105 | for (i = m68k_num_gregs; i < m68k_num_regs; i++) | |
442ea881 | 106 | supply_register (regcache, i, ((const char *) buf |
db1d3e1b AS |
107 | + (m68k_regmap[i] - m68k_regmap[m68k_num_gregs]))); |
108 | } | |
109 | ||
e9d25b98 | 110 | #endif /* HAVE_PTRACE_GETREGS */ |
db1d3e1b AS |
111 | |
112 | struct regset_info target_regsets[] = { | |
e9d25b98 | 113 | #ifdef HAVE_PTRACE_GETREGS |
1570b33e | 114 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
db1d3e1b AS |
115 | GENERAL_REGS, |
116 | m68k_fill_gregset, m68k_store_gregset }, | |
1570b33e | 117 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (elf_fpregset_t), |
db1d3e1b AS |
118 | FP_REGS, |
119 | m68k_fill_fpregset, m68k_store_fpregset }, | |
e9d25b98 | 120 | #endif /* HAVE_PTRACE_GETREGS */ |
1570b33e | 121 | { 0, 0, 0, -1, -1, NULL, NULL } |
db1d3e1b AS |
122 | }; |
123 | ||
f450004a | 124 | static const unsigned char m68k_breakpoint[] = { 0x4E, 0x4F }; |
db1d3e1b AS |
125 | #define m68k_breakpoint_len 2 |
126 | ||
127 | static CORE_ADDR | |
442ea881 | 128 | m68k_get_pc (struct regcache *regcache) |
db1d3e1b AS |
129 | { |
130 | unsigned long pc; | |
131 | ||
442ea881 | 132 | collect_register_by_name (regcache, "pc", &pc); |
db1d3e1b AS |
133 | return pc; |
134 | } | |
135 | ||
136 | static void | |
442ea881 | 137 | m68k_set_pc (struct regcache *regcache, CORE_ADDR value) |
db1d3e1b AS |
138 | { |
139 | unsigned long newpc = value; | |
140 | ||
442ea881 | 141 | supply_register_by_name (regcache, "pc", &newpc); |
db1d3e1b AS |
142 | } |
143 | ||
144 | static int | |
145 | m68k_breakpoint_at (CORE_ADDR pc) | |
146 | { | |
147 | unsigned char c[2]; | |
148 | ||
149 | read_inferior_memory (pc, c, 2); | |
150 | if (c[0] == 0x4E && c[1] == 0x4F) | |
151 | return 1; | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
fea36a59 MK |
156 | #include <asm/ptrace.h> |
157 | ||
28d3cf85 | 158 | #ifdef PTRACE_GET_THREAD_AREA |
fea36a59 MK |
159 | /* Fetch the thread-local storage pointer for libthread_db. */ |
160 | ||
161 | ps_err_e | |
162 | ps_get_thread_area (const struct ps_prochandle *ph, | |
163 | lwpid_t lwpid, int idx, void **base) | |
164 | { | |
165 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | |
166 | return PS_ERR; | |
167 | ||
168 | /* IDX is the bias from the thread pointer to the beginning of the | |
169 | thread descriptor. It has to be subtracted due to implementation | |
170 | quirks in libthread_db. */ | |
171 | *base = (void *) ((char *)*base - idx); | |
172 | ||
173 | return PS_OK; | |
174 | } | |
28d3cf85 | 175 | #endif /* PTRACE_GET_THREAD_AREA */ |
fea36a59 | 176 | |
2ec06d2e | 177 | struct linux_target_ops the_low_target = { |
d05b4ac3 | 178 | init_registers_m68k, |
2ec06d2e DJ |
179 | m68k_num_regs, |
180 | m68k_regmap, | |
1faeff08 | 181 | NULL, |
2ec06d2e DJ |
182 | m68k_cannot_fetch_register, |
183 | m68k_cannot_store_register, | |
c14dfd32 | 184 | NULL, /* fetch_register */ |
db1d3e1b AS |
185 | m68k_get_pc, |
186 | m68k_set_pc, | |
187 | m68k_breakpoint, | |
188 | m68k_breakpoint_len, | |
189 | NULL, | |
190 | 2, | |
191 | m68k_breakpoint_at, | |
2ec06d2e | 192 | }; |