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4933265c | 1 | /* GNU/Linux/OR1K specific low level interface for the GDB server. |
213516ef | 2 | Copyright (C) 2021-2023 Free Software Foundation, Inc. |
4933265c SH |
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 | |
8 | the Free Software Foundation; either version 3 of the License, or | |
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 | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include "server.h" | |
20 | #include "linux-low.h" | |
21 | #include "elf/common.h" | |
22 | #include "nat/gdb_ptrace.h" | |
23 | #include <endian.h> | |
24 | #include "gdb_proc_service.h" | |
25 | #include <asm/ptrace.h> | |
26 | ||
27 | #ifndef PTRACE_GET_THREAD_AREA | |
28 | #define PTRACE_GET_THREAD_AREA 25 | |
29 | #endif | |
30 | ||
31 | /* Linux target op definitions for the OpenRISC architecture. */ | |
32 | ||
33 | class or1k_target : public linux_process_target | |
34 | { | |
35 | public: | |
36 | ||
37 | const regs_info *get_regs_info () override; | |
38 | ||
39 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; | |
40 | ||
41 | protected: | |
42 | ||
43 | void low_arch_setup () override; | |
44 | ||
45 | bool low_cannot_fetch_register (int regno) override; | |
46 | ||
47 | bool low_cannot_store_register (int regno) override; | |
48 | ||
49 | bool low_supports_breakpoints () override; | |
50 | ||
51 | CORE_ADDR low_get_pc (regcache *regcache) override; | |
52 | ||
53 | void low_set_pc (regcache *regcache, CORE_ADDR newpc) override; | |
54 | ||
55 | bool low_breakpoint_at (CORE_ADDR pc) override; | |
56 | }; | |
57 | ||
58 | /* The singleton target ops object. */ | |
59 | ||
60 | static or1k_target the_or1k_target; | |
61 | ||
62 | bool | |
63 | or1k_target::low_supports_breakpoints () | |
64 | { | |
65 | return true; | |
66 | } | |
67 | ||
68 | CORE_ADDR | |
69 | or1k_target::low_get_pc (regcache *regcache) | |
70 | { | |
71 | return linux_get_pc_32bit (regcache); | |
72 | } | |
73 | ||
74 | void | |
75 | or1k_target::low_set_pc (regcache *regcache, CORE_ADDR pc) | |
76 | { | |
77 | linux_set_pc_32bit (regcache, pc); | |
78 | } | |
79 | ||
80 | /* The following definition must agree with the number of registers | |
81 | defined in "struct user_regs" in GLIBC | |
82 | (sysdeps/unix/sysv/linux/or1k/sys/ucontext.h), and also with | |
83 | OR1K_NUM_REGS in GDB proper. */ | |
84 | ||
85 | #define or1k_num_regs 35 | |
86 | ||
87 | /* Defined in auto-generated file or1k-linux.c. */ | |
88 | ||
89 | void init_registers_or1k_linux (void); | |
90 | extern const struct target_desc *tdesc_or1k_linux; | |
91 | ||
92 | /* This union is used to convert between int and byte buffer | |
93 | representations of register contents. */ | |
94 | ||
95 | union or1k_register | |
96 | { | |
97 | unsigned char buf[4]; | |
98 | int reg32; | |
99 | }; | |
100 | ||
101 | /* Return the ptrace ``address'' of register REGNO. */ | |
102 | ||
103 | static int or1k_regmap[] = { | |
104 | -1, 1, 2, 3, 4, 5, 6, 7, | |
105 | 8, 9, 10, 11, 12, 13, 14, 15, | |
106 | 16, 17, 18, 19, 20, 21, 22, 23, | |
107 | 24, 25, 26, 27, 28, 29, 30, 31, | |
108 | -1, /* PC */ | |
109 | -1, /* ORIGINAL R11 */ | |
110 | -1 /* SYSCALL NO */ | |
111 | }; | |
112 | ||
113 | /* Implement the low_arch_setup linux target ops method. */ | |
114 | ||
115 | void | |
116 | or1k_target::low_arch_setup () | |
117 | { | |
118 | current_process ()->tdesc = tdesc_or1k_linux; | |
119 | } | |
120 | ||
121 | /* Implement the low_cannot_fetch_register linux target ops method. */ | |
122 | ||
123 | bool | |
124 | or1k_target::low_cannot_fetch_register (int regno) | |
125 | { | |
126 | return (or1k_regmap[regno] == -1); | |
127 | } | |
128 | ||
129 | /* Implement the low_cannot_store_register linux target ops method. */ | |
130 | ||
131 | bool | |
132 | or1k_target::low_cannot_store_register (int regno) | |
133 | { | |
134 | return (or1k_regmap[regno] == -1); | |
135 | } | |
136 | ||
137 | /* Breakpoint support. */ | |
138 | ||
139 | static const unsigned int or1k_breakpoint = 0x21000001; | |
140 | #define or1k_breakpoint_len 4 | |
141 | ||
142 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ | |
143 | ||
144 | const gdb_byte * | |
145 | or1k_target::sw_breakpoint_from_kind (int kind, int *size) | |
146 | { | |
147 | *size = or1k_breakpoint_len; | |
148 | return (const gdb_byte *) &or1k_breakpoint; | |
149 | } | |
150 | ||
151 | /* Implement the low_breakpoint_at linux target ops method. */ | |
152 | ||
153 | bool | |
154 | or1k_target::low_breakpoint_at (CORE_ADDR where) | |
155 | { | |
156 | unsigned int insn; | |
157 | ||
158 | read_memory (where, (unsigned char *) &insn, or1k_breakpoint_len); | |
159 | if (insn == or1k_breakpoint) | |
160 | return true; | |
161 | return false; | |
162 | } | |
163 | ||
164 | /* Fetch the thread-local storage pointer for libthread_db. */ | |
165 | ||
166 | ps_err_e | |
167 | ps_get_thread_area (struct ps_prochandle *ph, | |
168 | lwpid_t lwpid, int idx, void **base) | |
169 | { | |
170 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | |
171 | return PS_ERR; | |
172 | ||
173 | /* IDX is the bias from the thread pointer to the beginning of the | |
174 | thread descriptor. It has to be subtracted due to implementation | |
175 | quirks in libthread_db. */ | |
176 | *base = (void *) ((char *) *base - idx); | |
177 | ||
178 | return PS_OK; | |
179 | } | |
180 | ||
181 | /* Helper functions to collect/supply a single register REGNO. */ | |
182 | ||
183 | static void | |
184 | or1k_collect_register (struct regcache *regcache, int regno, | |
185 | union or1k_register *reg) | |
186 | { | |
187 | union or1k_register tmp_reg; | |
188 | ||
189 | collect_register (regcache, regno, &tmp_reg.reg32); | |
190 | reg->reg32 = tmp_reg.reg32; | |
191 | } | |
192 | ||
193 | static void | |
194 | or1k_supply_register (struct regcache *regcache, int regno, | |
195 | const union or1k_register *reg) | |
196 | { | |
197 | supply_register (regcache, regno, reg->buf); | |
198 | } | |
199 | ||
200 | /* We have only a single register set on OpenRISC. */ | |
201 | ||
202 | static void | |
203 | or1k_fill_gregset (struct regcache *regcache, void *buf) | |
204 | { | |
205 | union or1k_register *regset = (union or1k_register *) buf; | |
206 | int i; | |
207 | ||
208 | for (i = 1; i < or1k_num_regs; i++) | |
209 | or1k_collect_register (regcache, i, regset + i); | |
210 | } | |
211 | ||
212 | static void | |
213 | or1k_store_gregset (struct regcache *regcache, const void *buf) | |
214 | { | |
215 | const union or1k_register *regset = (union or1k_register *) buf; | |
216 | int i; | |
217 | ||
218 | for (i = 0; i < or1k_num_regs; i++) | |
219 | or1k_supply_register (regcache, i, regset + i); | |
220 | } | |
221 | ||
222 | static struct regset_info or1k_regsets[] = | |
223 | { | |
224 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, | |
225 | or1k_num_regs * 4, GENERAL_REGS, | |
226 | or1k_fill_gregset, or1k_store_gregset }, | |
227 | NULL_REGSET | |
228 | }; | |
229 | ||
230 | static struct regsets_info or1k_regsets_info = | |
231 | { | |
232 | or1k_regsets, /* regsets */ | |
233 | 0, /* num_regsets */ | |
234 | NULL, /* disabled_regsets */ | |
235 | }; | |
236 | ||
237 | static struct usrregs_info or1k_usrregs_info = | |
238 | { | |
239 | or1k_num_regs, | |
240 | or1k_regmap, | |
241 | }; | |
242 | ||
243 | static struct regs_info or1k_regs = | |
244 | { | |
245 | NULL, /* regset_bitmap */ | |
246 | &or1k_usrregs_info, | |
247 | &or1k_regsets_info | |
248 | }; | |
249 | ||
250 | const regs_info * | |
251 | or1k_target::get_regs_info () | |
252 | { | |
253 | return &or1k_regs; | |
254 | } | |
255 | ||
256 | /* The linux target ops object. */ | |
257 | ||
258 | linux_process_target *the_linux_target = &the_or1k_target; | |
259 | ||
260 | void | |
261 | initialize_low_arch (void) | |
262 | { | |
263 | init_registers_or1k_linux (); | |
264 | ||
265 | initialize_regsets_info (&or1k_regsets_info); | |
266 | } |