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1 | /* GNU/Linux/LoongArch specific low level interface, for the remote server |
2 | for GDB. | |
3 | Copyright (C) 2022 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "server.h" | |
21 | #include "linux-low.h" | |
22 | #include "tdesc.h" | |
23 | #include "elf/common.h" | |
24 | #include "arch/loongarch.h" | |
25 | ||
26 | /* Linux target ops definitions for the LoongArch architecture. */ | |
27 | ||
28 | class loongarch_target : public linux_process_target | |
29 | { | |
30 | public: | |
31 | ||
32 | const regs_info *get_regs_info () override; | |
33 | ||
34 | int breakpoint_kind_from_pc (CORE_ADDR *pcptr) override; | |
35 | ||
36 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; | |
37 | ||
38 | protected: | |
39 | ||
40 | void low_arch_setup () override; | |
41 | ||
42 | bool low_cannot_fetch_register (int regno) override; | |
43 | ||
44 | bool low_cannot_store_register (int regno) override; | |
45 | ||
46 | bool low_fetch_register (regcache *regcache, 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 loongarch_target the_loongarch_target; | |
60 | ||
61 | bool | |
62 | loongarch_target::low_cannot_fetch_register (int regno) | |
63 | { | |
64 | gdb_assert_not_reached ("linux target op low_cannot_fetch_register " | |
65 | "is not implemented by the target"); | |
66 | } | |
67 | ||
68 | bool | |
69 | loongarch_target::low_cannot_store_register (int regno) | |
70 | { | |
71 | gdb_assert_not_reached ("linux target op low_cannot_store_register " | |
72 | "is not implemented by the target"); | |
73 | } | |
74 | ||
75 | /* Implementation of linux target ops method "low_arch_setup". */ | |
76 | ||
77 | void | |
78 | loongarch_target::low_arch_setup () | |
79 | { | |
80 | static const char *expedite_regs[] = { "r3", "pc", NULL }; | |
81 | loongarch_gdbarch_features features; | |
82 | target_desc_up tdesc; | |
83 | ||
84 | features.xlen = sizeof (elf_greg_t); | |
85 | tdesc = loongarch_create_target_description (features); | |
86 | ||
87 | if (!tdesc->expedite_regs) | |
88 | init_target_desc (tdesc.get (), expedite_regs); | |
89 | current_process ()->tdesc = tdesc.release (); | |
90 | } | |
91 | ||
92 | /* Collect GPRs from REGCACHE into BUF. */ | |
93 | ||
94 | static void | |
95 | loongarch_fill_gregset (struct regcache *regcache, void *buf) | |
96 | { | |
97 | const struct target_desc *tdesc = regcache->tdesc; | |
98 | elf_gregset_t *regset = (elf_gregset_t *) buf; | |
99 | int regno = find_regno (tdesc, "r0"); | |
100 | int i; | |
101 | ||
102 | for (i = 1; i < 32; i++) | |
103 | collect_register (regcache, regno + i, *regset + i); | |
104 | collect_register_by_name (regcache, "pc", *regset + 32); | |
105 | collect_register_by_name (regcache, "badv", *regset + 33); | |
106 | } | |
107 | ||
108 | /* Supply GPRs from BUF into REGCACHE. */ | |
109 | ||
110 | static void | |
111 | loongarch_store_gregset (struct regcache *regcache, const void *buf) | |
112 | { | |
113 | const struct target_desc *tdesc = regcache->tdesc; | |
114 | const elf_gregset_t *regset = (const elf_gregset_t *) buf; | |
115 | int regno = find_regno (tdesc, "r0"); | |
116 | int i; | |
117 | ||
118 | supply_register_zeroed (regcache, regno); | |
119 | for (i = 1; i < 32; i++) | |
120 | supply_register (regcache, regno + i, *regset + i); | |
121 | supply_register_by_name (regcache, "pc", *regset + 32); | |
122 | supply_register_by_name (regcache, "badv", *regset + 33); | |
123 | } | |
124 | ||
125 | /* LoongArch/Linux regsets. */ | |
126 | static struct regset_info loongarch_regsets[] = { | |
127 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, sizeof (elf_gregset_t), | |
128 | GENERAL_REGS, loongarch_fill_gregset, loongarch_store_gregset }, | |
129 | NULL_REGSET | |
130 | }; | |
131 | ||
132 | /* LoongArch/Linux regset information. */ | |
133 | static struct regsets_info loongarch_regsets_info = | |
134 | { | |
135 | loongarch_regsets, /* regsets */ | |
136 | 0, /* num_regsets */ | |
137 | NULL, /* disabled_regsets */ | |
138 | }; | |
139 | ||
140 | /* Definition of linux_target_ops data member "regs_info". */ | |
141 | static struct regs_info loongarch_regs = | |
142 | { | |
143 | NULL, /* regset_bitmap */ | |
144 | NULL, /* usrregs */ | |
145 | &loongarch_regsets_info, | |
146 | }; | |
147 | ||
148 | /* Implementation of linux target ops method "get_regs_info". */ | |
149 | ||
150 | const regs_info * | |
151 | loongarch_target::get_regs_info () | |
152 | { | |
153 | return &loongarch_regs; | |
154 | } | |
155 | ||
156 | /* Implementation of linux target ops method "low_fetch_register". */ | |
157 | ||
158 | bool | |
159 | loongarch_target::low_fetch_register (regcache *regcache, int regno) | |
160 | { | |
161 | const struct target_desc *tdesc = regcache->tdesc; | |
162 | ||
163 | if (regno != find_regno (tdesc, "r0")) | |
164 | return false; | |
165 | supply_register_zeroed (regcache, regno); | |
166 | return true; | |
167 | } | |
168 | ||
169 | bool | |
170 | loongarch_target::low_supports_breakpoints () | |
171 | { | |
172 | return true; | |
173 | } | |
174 | ||
175 | /* Implementation of linux target ops method "low_get_pc". */ | |
176 | ||
177 | CORE_ADDR | |
178 | loongarch_target::low_get_pc (regcache *regcache) | |
179 | { | |
180 | if (register_size (regcache->tdesc, 0) == 8) | |
181 | return linux_get_pc_64bit (regcache); | |
182 | else | |
183 | return linux_get_pc_32bit (regcache); | |
184 | } | |
185 | ||
186 | /* Implementation of linux target ops method "low_set_pc". */ | |
187 | ||
188 | void | |
189 | loongarch_target::low_set_pc (regcache *regcache, CORE_ADDR newpc) | |
190 | { | |
191 | if (register_size (regcache->tdesc, 0) == 8) | |
192 | linux_set_pc_64bit (regcache, newpc); | |
193 | else | |
194 | linux_set_pc_32bit (regcache, newpc); | |
195 | } | |
196 | ||
197 | #define loongarch_breakpoint_len 4 | |
198 | ||
199 | /* LoongArch BRK software debug mode instruction. | |
200 | This instruction needs to match gdb/loongarch-tdep.c | |
201 | (loongarch_default_breakpoint). */ | |
202 | static const gdb_byte loongarch_breakpoint[] = {0x05, 0x00, 0x2a, 0x00}; | |
203 | ||
204 | /* Implementation of target ops method "breakpoint_kind_from_pc". */ | |
205 | ||
206 | int | |
207 | loongarch_target::breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
208 | { | |
209 | return loongarch_breakpoint_len; | |
210 | } | |
211 | ||
212 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ | |
213 | ||
214 | const gdb_byte * | |
215 | loongarch_target::sw_breakpoint_from_kind (int kind, int *size) | |
216 | { | |
217 | *size = loongarch_breakpoint_len; | |
218 | return (const gdb_byte *) &loongarch_breakpoint; | |
219 | } | |
220 | ||
221 | /* Implementation of linux target ops method "low_breakpoint_at". */ | |
222 | ||
223 | bool | |
224 | loongarch_target::low_breakpoint_at (CORE_ADDR pc) | |
225 | { | |
226 | gdb_byte insn[loongarch_breakpoint_len]; | |
227 | ||
228 | read_memory (pc, (unsigned char *) &insn, loongarch_breakpoint_len); | |
229 | if (memcmp (insn, loongarch_breakpoint, loongarch_breakpoint_len) == 0) | |
230 | return true; | |
231 | ||
232 | return false; | |
233 | } | |
234 | ||
235 | /* The linux target ops object. */ | |
236 | ||
237 | linux_process_target *the_linux_target = &the_loongarch_target; | |
238 | ||
239 | /* Initialize the LoongArch/Linux target. */ | |
240 | ||
241 | void | |
242 | initialize_low_arch () | |
243 | { | |
244 | initialize_regsets_info (&loongarch_regsets_info); | |
245 | } |