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4933265c | 1 | /* GNU/Linux/OR1K specific low level interface for the GDB server. |
1d506c26 | 2 | Copyright (C) 2021-2024 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 | ||
4933265c SH |
19 | #include "linux-low.h" |
20 | #include "elf/common.h" | |
21 | #include "nat/gdb_ptrace.h" | |
22 | #include <endian.h> | |
23 | #include "gdb_proc_service.h" | |
24 | #include <asm/ptrace.h> | |
25 | ||
26 | #ifndef PTRACE_GET_THREAD_AREA | |
27 | #define PTRACE_GET_THREAD_AREA 25 | |
28 | #endif | |
29 | ||
30 | /* Linux target op definitions for the OpenRISC architecture. */ | |
31 | ||
32 | class or1k_target : public linux_process_target | |
33 | { | |
34 | public: | |
35 | ||
36 | const regs_info *get_regs_info () override; | |
37 | ||
38 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; | |
39 | ||
40 | protected: | |
41 | ||
42 | void low_arch_setup () override; | |
43 | ||
44 | bool low_cannot_fetch_register (int regno) override; | |
45 | ||
46 | bool low_cannot_store_register (int regno) override; | |
47 | ||
48 | bool low_supports_breakpoints () override; | |
49 | ||
50 | CORE_ADDR low_get_pc (regcache *regcache) override; | |
51 | ||
52 | void low_set_pc (regcache *regcache, CORE_ADDR newpc) override; | |
53 | ||
54 | bool low_breakpoint_at (CORE_ADDR pc) override; | |
55 | }; | |
56 | ||
57 | /* The singleton target ops object. */ | |
58 | ||
59 | static or1k_target the_or1k_target; | |
60 | ||
61 | bool | |
62 | or1k_target::low_supports_breakpoints () | |
63 | { | |
64 | return true; | |
65 | } | |
66 | ||
67 | CORE_ADDR | |
68 | or1k_target::low_get_pc (regcache *regcache) | |
69 | { | |
70 | return linux_get_pc_32bit (regcache); | |
71 | } | |
72 | ||
73 | void | |
74 | or1k_target::low_set_pc (regcache *regcache, CORE_ADDR pc) | |
75 | { | |
76 | linux_set_pc_32bit (regcache, pc); | |
77 | } | |
78 | ||
79 | /* The following definition must agree with the number of registers | |
80 | defined in "struct user_regs" in GLIBC | |
81 | (sysdeps/unix/sysv/linux/or1k/sys/ucontext.h), and also with | |
82 | OR1K_NUM_REGS in GDB proper. */ | |
83 | ||
84 | #define or1k_num_regs 35 | |
85 | ||
86 | /* Defined in auto-generated file or1k-linux.c. */ | |
87 | ||
88 | void init_registers_or1k_linux (void); | |
89 | extern const struct target_desc *tdesc_or1k_linux; | |
90 | ||
91 | /* This union is used to convert between int and byte buffer | |
92 | representations of register contents. */ | |
93 | ||
94 | union or1k_register | |
95 | { | |
96 | unsigned char buf[4]; | |
97 | int reg32; | |
98 | }; | |
99 | ||
100 | /* Return the ptrace ``address'' of register REGNO. */ | |
101 | ||
102 | static int or1k_regmap[] = { | |
103 | -1, 1, 2, 3, 4, 5, 6, 7, | |
104 | 8, 9, 10, 11, 12, 13, 14, 15, | |
105 | 16, 17, 18, 19, 20, 21, 22, 23, | |
106 | 24, 25, 26, 27, 28, 29, 30, 31, | |
107 | -1, /* PC */ | |
108 | -1, /* ORIGINAL R11 */ | |
109 | -1 /* SYSCALL NO */ | |
110 | }; | |
111 | ||
112 | /* Implement the low_arch_setup linux target ops method. */ | |
113 | ||
114 | void | |
115 | or1k_target::low_arch_setup () | |
116 | { | |
117 | current_process ()->tdesc = tdesc_or1k_linux; | |
118 | } | |
119 | ||
120 | /* Implement the low_cannot_fetch_register linux target ops method. */ | |
121 | ||
122 | bool | |
123 | or1k_target::low_cannot_fetch_register (int regno) | |
124 | { | |
125 | return (or1k_regmap[regno] == -1); | |
126 | } | |
127 | ||
128 | /* Implement the low_cannot_store_register linux target ops method. */ | |
129 | ||
130 | bool | |
131 | or1k_target::low_cannot_store_register (int regno) | |
132 | { | |
133 | return (or1k_regmap[regno] == -1); | |
134 | } | |
135 | ||
136 | /* Breakpoint support. */ | |
137 | ||
138 | static const unsigned int or1k_breakpoint = 0x21000001; | |
139 | #define or1k_breakpoint_len 4 | |
140 | ||
141 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ | |
142 | ||
143 | const gdb_byte * | |
144 | or1k_target::sw_breakpoint_from_kind (int kind, int *size) | |
145 | { | |
146 | *size = or1k_breakpoint_len; | |
147 | return (const gdb_byte *) &or1k_breakpoint; | |
148 | } | |
149 | ||
150 | /* Implement the low_breakpoint_at linux target ops method. */ | |
151 | ||
152 | bool | |
153 | or1k_target::low_breakpoint_at (CORE_ADDR where) | |
154 | { | |
155 | unsigned int insn; | |
156 | ||
157 | read_memory (where, (unsigned char *) &insn, or1k_breakpoint_len); | |
158 | if (insn == or1k_breakpoint) | |
159 | return true; | |
160 | return false; | |
161 | } | |
162 | ||
163 | /* Fetch the thread-local storage pointer for libthread_db. */ | |
164 | ||
165 | ps_err_e | |
166 | ps_get_thread_area (struct ps_prochandle *ph, | |
167 | lwpid_t lwpid, int idx, void **base) | |
168 | { | |
169 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | |
170 | return PS_ERR; | |
171 | ||
172 | /* IDX is the bias from the thread pointer to the beginning of the | |
173 | thread descriptor. It has to be subtracted due to implementation | |
174 | quirks in libthread_db. */ | |
175 | *base = (void *) ((char *) *base - idx); | |
176 | ||
177 | return PS_OK; | |
178 | } | |
179 | ||
180 | /* Helper functions to collect/supply a single register REGNO. */ | |
181 | ||
182 | static void | |
183 | or1k_collect_register (struct regcache *regcache, int regno, | |
184 | union or1k_register *reg) | |
185 | { | |
186 | union or1k_register tmp_reg; | |
187 | ||
188 | collect_register (regcache, regno, &tmp_reg.reg32); | |
189 | reg->reg32 = tmp_reg.reg32; | |
190 | } | |
191 | ||
192 | static void | |
193 | or1k_supply_register (struct regcache *regcache, int regno, | |
194 | const union or1k_register *reg) | |
195 | { | |
196 | supply_register (regcache, regno, reg->buf); | |
197 | } | |
198 | ||
199 | /* We have only a single register set on OpenRISC. */ | |
200 | ||
201 | static void | |
202 | or1k_fill_gregset (struct regcache *regcache, void *buf) | |
203 | { | |
204 | union or1k_register *regset = (union or1k_register *) buf; | |
205 | int i; | |
206 | ||
207 | for (i = 1; i < or1k_num_regs; i++) | |
208 | or1k_collect_register (regcache, i, regset + i); | |
209 | } | |
210 | ||
211 | static void | |
212 | or1k_store_gregset (struct regcache *regcache, const void *buf) | |
213 | { | |
214 | const union or1k_register *regset = (union or1k_register *) buf; | |
215 | int i; | |
216 | ||
217 | for (i = 0; i < or1k_num_regs; i++) | |
218 | or1k_supply_register (regcache, i, regset + i); | |
219 | } | |
220 | ||
221 | static struct regset_info or1k_regsets[] = | |
222 | { | |
223 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, | |
224 | or1k_num_regs * 4, GENERAL_REGS, | |
225 | or1k_fill_gregset, or1k_store_gregset }, | |
226 | NULL_REGSET | |
227 | }; | |
228 | ||
229 | static struct regsets_info or1k_regsets_info = | |
230 | { | |
231 | or1k_regsets, /* regsets */ | |
232 | 0, /* num_regsets */ | |
233 | NULL, /* disabled_regsets */ | |
234 | }; | |
235 | ||
236 | static struct usrregs_info or1k_usrregs_info = | |
237 | { | |
238 | or1k_num_regs, | |
239 | or1k_regmap, | |
240 | }; | |
241 | ||
242 | static struct regs_info or1k_regs = | |
243 | { | |
244 | NULL, /* regset_bitmap */ | |
245 | &or1k_usrregs_info, | |
246 | &or1k_regsets_info | |
247 | }; | |
248 | ||
249 | const regs_info * | |
250 | or1k_target::get_regs_info () | |
251 | { | |
252 | return &or1k_regs; | |
253 | } | |
254 | ||
255 | /* The linux target ops object. */ | |
256 | ||
257 | linux_process_target *the_linux_target = &the_or1k_target; | |
258 | ||
259 | void | |
260 | initialize_low_arch (void) | |
261 | { | |
262 | init_registers_or1k_linux (); | |
263 | ||
264 | initialize_regsets_info (&or1k_regsets_info); | |
265 | } |