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68f5f838 SL |
1 | /* GNU/Linux/Nios II specific low level interface, for the remote server for |
2 | GDB. | |
1d506c26 | 3 | Copyright (C) 2008-2024 Free Software Foundation, Inc. |
68f5f838 SL |
4 | |
5 | Contributed by Mentor Graphics, Inc. | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
21 | ||
68f5f838 | 22 | #include "linux-low.h" |
21e94bd9 | 23 | #include "elf/common.h" |
5826e159 | 24 | #include "nat/gdb_ptrace.h" |
68f5f838 SL |
25 | #include <endian.h> |
26 | #include "gdb_proc_service.h" | |
27 | #include <asm/ptrace.h> | |
28 | ||
29 | #ifndef PTRACE_GET_THREAD_AREA | |
30 | #define PTRACE_GET_THREAD_AREA 25 | |
31 | #endif | |
32 | ||
ef0478f6 TBA |
33 | /* Linux target op definitions for the NIOS II architecture. */ |
34 | ||
35 | class nios2_target : public linux_process_target | |
36 | { | |
37 | public: | |
38 | ||
aa8d21c9 TBA |
39 | const regs_info *get_regs_info () override; |
40 | ||
3ca4edb6 TBA |
41 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; |
42 | ||
797bcff5 TBA |
43 | protected: |
44 | ||
45 | void low_arch_setup () override; | |
daca57a7 TBA |
46 | |
47 | bool low_cannot_fetch_register (int regno) override; | |
48 | ||
49 | bool low_cannot_store_register (int regno) override; | |
bf9ae9d8 TBA |
50 | |
51 | bool low_supports_breakpoints () override; | |
52 | ||
53 | CORE_ADDR low_get_pc (regcache *regcache) override; | |
54 | ||
55 | void low_set_pc (regcache *regcache, CORE_ADDR newpc) override; | |
d7146cda TBA |
56 | |
57 | bool low_breakpoint_at (CORE_ADDR pc) override; | |
ef0478f6 TBA |
58 | }; |
59 | ||
60 | /* The singleton target ops object. */ | |
61 | ||
62 | static nios2_target the_nios2_target; | |
63 | ||
bf9ae9d8 TBA |
64 | bool |
65 | nios2_target::low_supports_breakpoints () | |
66 | { | |
67 | return true; | |
68 | } | |
69 | ||
70 | CORE_ADDR | |
71 | nios2_target::low_get_pc (regcache *regcache) | |
72 | { | |
73 | return linux_get_pc_32bit (regcache); | |
74 | } | |
75 | ||
76 | void | |
77 | nios2_target::low_set_pc (regcache *regcache, CORE_ADDR pc) | |
78 | { | |
79 | linux_set_pc_32bit (regcache, pc); | |
80 | } | |
81 | ||
68f5f838 SL |
82 | /* The following definition must agree with the number of registers |
83 | defined in "struct user_regs" in GLIBC | |
21e94bd9 | 84 | (sysdeps/unix/sysv/linux/nios2/sys/user.h), and also with |
68f5f838 SL |
85 | NIOS2_NUM_REGS in GDB proper. */ |
86 | ||
87 | #define nios2_num_regs 49 | |
88 | ||
89 | /* Defined in auto-generated file nios2-linux.c. */ | |
90 | ||
91 | void init_registers_nios2_linux (void); | |
3aee8918 | 92 | extern const struct target_desc *tdesc_nios2_linux; |
68f5f838 SL |
93 | |
94 | /* This union is used to convert between int and byte buffer | |
95 | representations of register contents. */ | |
96 | ||
97 | union nios2_register | |
98 | { | |
99 | unsigned char buf[4]; | |
100 | int reg32; | |
101 | }; | |
102 | ||
103 | /* Return the ptrace ``address'' of register REGNO. */ | |
104 | ||
105 | static int nios2_regmap[] = { | |
106 | -1, 1, 2, 3, 4, 5, 6, 7, | |
107 | 8, 9, 10, 11, 12, 13, 14, 15, | |
108 | 16, 17, 18, 19, 20, 21, 22, 23, | |
109 | 24, 25, 26, 27, 28, 29, 30, 31, | |
110 | 32, 33, 34, 35, 36, 37, 38, 39, | |
111 | 40, 41, 42, 43, 44, 45, 46, 47, | |
112 | 48, | |
113 | 0 | |
114 | }; | |
115 | ||
797bcff5 | 116 | /* Implement the low_arch_setup linux target ops method. */ |
68f5f838 | 117 | |
797bcff5 TBA |
118 | void |
119 | nios2_target::low_arch_setup () | |
68f5f838 | 120 | { |
3aee8918 | 121 | current_process ()->tdesc = tdesc_nios2_linux; |
68f5f838 SL |
122 | } |
123 | ||
daca57a7 | 124 | /* Implement the low_cannot_fetch_register linux target ops method. */ |
68f5f838 | 125 | |
daca57a7 TBA |
126 | bool |
127 | nios2_target::low_cannot_fetch_register (int regno) | |
68f5f838 | 128 | { |
daca57a7 | 129 | return (nios2_regmap[regno] == -1); |
68f5f838 SL |
130 | } |
131 | ||
daca57a7 | 132 | /* Implement the low_cannot_store_register linux target ops method. */ |
68f5f838 | 133 | |
daca57a7 TBA |
134 | bool |
135 | nios2_target::low_cannot_store_register (int regno) | |
68f5f838 | 136 | { |
daca57a7 | 137 | return (nios2_regmap[regno] == -1); |
68f5f838 SL |
138 | } |
139 | ||
af60a1ef SL |
140 | /* Breakpoint support. Also see comments on nios2_breakpoint_from_pc |
141 | in nios2-tdep.c. */ | |
142 | ||
143 | #if defined(__nios2_arch__) && __nios2_arch__ == 2 | |
144 | #define NIOS2_BREAKPOINT 0xb7fd0020 | |
145 | #define CDX_BREAKPOINT 0xd7c9 | |
146 | #else | |
147 | #define NIOS2_BREAKPOINT 0x003b6ffa | |
148 | #endif | |
68f5f838 | 149 | |
dd373349 AT |
150 | /* We only register the 4-byte breakpoint, even on R2 targets which also |
151 | support 2-byte breakpoints. Since there is no supports_z_point_type | |
152 | function provided, gdbserver never inserts software breakpoints itself | |
153 | and instead relies on GDB to insert the breakpoint of the correct length | |
154 | via a memory write. */ | |
af60a1ef | 155 | static const unsigned int nios2_breakpoint = NIOS2_BREAKPOINT; |
68f5f838 SL |
156 | #define nios2_breakpoint_len 4 |
157 | ||
3ca4edb6 | 158 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ |
dd373349 | 159 | |
3ca4edb6 TBA |
160 | const gdb_byte * |
161 | nios2_target::sw_breakpoint_from_kind (int kind, int *size) | |
dd373349 AT |
162 | { |
163 | *size = nios2_breakpoint_len; | |
164 | return (const gdb_byte *) &nios2_breakpoint; | |
165 | } | |
166 | ||
d7146cda | 167 | /* Implement the low_breakpoint_at linux target ops method. */ |
68f5f838 | 168 | |
d7146cda TBA |
169 | bool |
170 | nios2_target::low_breakpoint_at (CORE_ADDR where) | |
68f5f838 SL |
171 | { |
172 | unsigned int insn; | |
173 | ||
af60a1ef SL |
174 | /* For R2, first check for the 2-byte CDX trap.n breakpoint encoding. */ |
175 | #if defined(__nios2_arch__) && __nios2_arch__ == 2 | |
d7146cda | 176 | read_memory (where, (unsigned char *) &insn, 2); |
af60a1ef | 177 | if (insn == CDX_BREAKPOINT) |
d7146cda | 178 | return true; |
af60a1ef SL |
179 | #endif |
180 | ||
d7146cda | 181 | read_memory (where, (unsigned char *) &insn, 4); |
68f5f838 | 182 | if (insn == nios2_breakpoint) |
d7146cda TBA |
183 | return true; |
184 | return false; | |
68f5f838 SL |
185 | } |
186 | ||
187 | /* Fetch the thread-local storage pointer for libthread_db. */ | |
188 | ||
189 | ps_err_e | |
754653a7 | 190 | ps_get_thread_area (struct ps_prochandle *ph, |
dda83cd7 | 191 | lwpid_t lwpid, int idx, void **base) |
68f5f838 SL |
192 | { |
193 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | |
194 | return PS_ERR; | |
195 | ||
196 | /* IDX is the bias from the thread pointer to the beginning of the | |
197 | thread descriptor. It has to be subtracted due to implementation | |
198 | quirks in libthread_db. */ | |
199 | *base = (void *) ((char *) *base - idx); | |
200 | ||
201 | return PS_OK; | |
202 | } | |
203 | ||
68f5f838 SL |
204 | /* Helper functions to collect/supply a single register REGNO. */ |
205 | ||
206 | static void | |
207 | nios2_collect_register (struct regcache *regcache, int regno, | |
208 | union nios2_register *reg) | |
209 | { | |
210 | union nios2_register tmp_reg; | |
211 | ||
212 | collect_register (regcache, regno, &tmp_reg.reg32); | |
213 | reg->reg32 = tmp_reg.reg32; | |
214 | } | |
215 | ||
216 | static void | |
217 | nios2_supply_register (struct regcache *regcache, int regno, | |
218 | const union nios2_register *reg) | |
219 | { | |
220 | supply_register (regcache, regno, reg->buf); | |
221 | } | |
222 | ||
223 | /* We have only a single register set on Nios II. */ | |
224 | ||
225 | static void | |
226 | nios2_fill_gregset (struct regcache *regcache, void *buf) | |
227 | { | |
b1c51e36 | 228 | union nios2_register *regset = (union nios2_register *) buf; |
68f5f838 SL |
229 | int i; |
230 | ||
231 | for (i = 1; i < nios2_num_regs; i++) | |
232 | nios2_collect_register (regcache, i, regset + i); | |
233 | } | |
234 | ||
235 | static void | |
236 | nios2_store_gregset (struct regcache *regcache, const void *buf) | |
237 | { | |
b1c51e36 | 238 | const union nios2_register *regset = (union nios2_register *) buf; |
68f5f838 SL |
239 | int i; |
240 | ||
241 | for (i = 0; i < nios2_num_regs; i++) | |
242 | nios2_supply_register (regcache, i, regset + i); | |
243 | } | |
68f5f838 | 244 | |
3aee8918 | 245 | static struct regset_info nios2_regsets[] = |
68f5f838 | 246 | { |
21e94bd9 SL |
247 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, |
248 | nios2_num_regs * 4, GENERAL_REGS, | |
68f5f838 | 249 | nios2_fill_gregset, nios2_store_gregset }, |
50bc912a | 250 | NULL_REGSET |
68f5f838 SL |
251 | }; |
252 | ||
3aee8918 PA |
253 | static struct regsets_info nios2_regsets_info = |
254 | { | |
255 | nios2_regsets, /* regsets */ | |
256 | 0, /* num_regsets */ | |
257 | NULL, /* disabled_regsets */ | |
258 | }; | |
259 | ||
260 | static struct usrregs_info nios2_usrregs_info = | |
261 | { | |
262 | nios2_num_regs, | |
263 | nios2_regmap, | |
264 | }; | |
265 | ||
aa8d21c9 | 266 | static struct regs_info myregs_info = |
3aee8918 PA |
267 | { |
268 | NULL, /* regset_bitmap */ | |
269 | &nios2_usrregs_info, | |
270 | &nios2_regsets_info | |
271 | }; | |
272 | ||
aa8d21c9 TBA |
273 | const regs_info * |
274 | nios2_target::get_regs_info () | |
3aee8918 | 275 | { |
aa8d21c9 | 276 | return &myregs_info; |
3aee8918 PA |
277 | } |
278 | ||
ef0478f6 TBA |
279 | /* The linux target ops object. */ |
280 | ||
281 | linux_process_target *the_linux_target = &the_nios2_target; | |
282 | ||
3aee8918 PA |
283 | void |
284 | initialize_low_arch (void) | |
285 | { | |
286 | init_registers_nios2_linux (); | |
287 | ||
288 | initialize_regsets_info (&nios2_regsets_info); | |
289 | } |