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02cd1b4e | 1 | /* GNU/Linux/MIPS specific low level interface, for the remote server for GDB. |
1d506c26 | 2 | Copyright (C) 2022-2024 Free Software Foundation, Inc. |
02cd1b4e JL |
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 | ||
02cd1b4e JL |
19 | #include "tdesc.h" |
20 | #include "linux-low.h" | |
21 | #include <sys/ptrace.h> | |
22 | #include "gdb_proc_service.h" | |
23 | #include <asm/ptrace.h> | |
24 | #include <elf.h> | |
25 | #include "arch/csky.h" | |
26 | ||
27 | /* Linux target op definitions for the CSKY architecture. */ | |
28 | ||
29 | class csky_target : public linux_process_target | |
30 | { | |
31 | public: | |
32 | ||
33 | const regs_info *get_regs_info () override; | |
34 | ||
35 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; | |
36 | ||
37 | bool supports_z_point_type (char z_type) override; | |
38 | ||
39 | bool supports_hardware_single_step () 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 | CORE_ADDR low_get_pc (regcache *regcache) override; | |
50 | ||
51 | void low_set_pc (regcache *regcache, CORE_ADDR newpc) override; | |
52 | ||
53 | bool low_breakpoint_at (CORE_ADDR pc) override; | |
54 | }; | |
55 | ||
56 | /* The singleton target ops object. */ | |
57 | ||
58 | static csky_target the_csky_target; | |
59 | ||
60 | /* Return the ptrace "address" of register REGNO. */ | |
61 | static int csky_regmap[] = { | |
62 | 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, | |
63 | 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, | |
64 | 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, | |
65 | 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, | |
66 | -1, -1, -1, -1, 34*4, 35*4, -1, -1, | |
67 | 40*4, 42*4, 44*4, 46*4, 48*4, 50*4, 52*4, 54*4, /* fr0 ~ fr15, 64bit */ | |
68 | 56*4, 58*4, 60*4, 62*4, 64*4, 66*4, 68*4, 70*4, | |
69 | 72*4, 76*4, 80*4, 84*4, 88*4, 92*4, 96*4,100*4, /* vr0 ~ vr15, 128bit */ | |
70 | 104*4,108*4,112*4,116*4,120*4,124*4,128*4,132*4, | |
71 | 33*4, /* pc */ | |
72 | -1, -1, -1, -1, -1, -1, -1, -1, | |
73 | -1, -1, -1, -1, -1, -1, -1, -1, | |
74 | 32*4, -1, -1, -1, -1, -1, -1, -1, /* psr */ | |
75 | -1, -1, -1, -1, -1, -1, -1, -1, | |
76 | -1, -1, -1, -1, -1, -1, -1, -1, | |
77 | -1, -1, -1, -1, -1, -1, -1, -1, | |
78 | 73*4, 72*4, 74*4, -1, -1, -1, 14*4, /* fcr, fid, fesr, usp */ | |
79 | }; | |
80 | ||
81 | /* CSKY software breakpoint instruction code. */ | |
82 | ||
83 | /* When the kernel code version is behind v4.x, | |
84 | illegal insn 0x1464 will be a software bkpt trigger. | |
85 | When an illegal insn exception happens, the case | |
86 | that insn at EPC is 0x1464 will be recognized as SIGTRAP. */ | |
87 | static unsigned short csky_breakpoint_illegal_2_v2 = 0x1464; | |
88 | static unsigned int csky_breakpoint_illegal_4_v2 = 0x14641464; | |
89 | ||
90 | bool | |
91 | csky_target::low_cannot_fetch_register (int regno) | |
92 | { | |
93 | if (csky_regmap[regno] == -1) | |
94 | return true; | |
95 | ||
96 | return false; | |
97 | } | |
98 | ||
99 | bool | |
100 | csky_target::low_cannot_store_register (int regno) | |
101 | { | |
102 | if (csky_regmap[regno] == -1) | |
103 | return true; | |
104 | ||
105 | return false; | |
106 | } | |
107 | ||
108 | /* Get the value of pc register. */ | |
109 | ||
110 | CORE_ADDR | |
111 | csky_target::low_get_pc (struct regcache *regcache) | |
112 | { | |
113 | unsigned long pc; | |
114 | collect_register_by_name (regcache, "pc", &pc); | |
115 | return pc; | |
116 | } | |
117 | ||
118 | /* Set pc register. */ | |
119 | ||
120 | void | |
121 | csky_target::low_set_pc (struct regcache *regcache, CORE_ADDR pc) | |
122 | { | |
123 | unsigned long new_pc = pc; | |
124 | supply_register_by_name (regcache, "pc", &new_pc); | |
125 | } | |
126 | ||
127 | ||
128 | void | |
129 | csky_target::low_arch_setup () | |
130 | { | |
131 | static const char *expedite_regs[] = { "r14", "pc", NULL }; | |
132 | target_desc_up tdesc = csky_create_target_description (); | |
133 | ||
dd6a9ec1 AB |
134 | if (tdesc->expedite_regs.empty ()) |
135 | { | |
136 | init_target_desc (tdesc.get (), expedite_regs); | |
137 | gdb_assert (!tdesc->expedite_regs.empty ()); | |
138 | } | |
02cd1b4e JL |
139 | |
140 | current_process ()->tdesc = tdesc.release (); | |
141 | ||
142 | return; | |
143 | } | |
144 | ||
145 | /* Fetch the thread-local storage pointer for libthread_db. */ | |
146 | ||
147 | ps_err_e | |
148 | ps_get_thread_area (struct ps_prochandle *ph, | |
149 | lwpid_t lwpid, int idx, void **base) | |
150 | { | |
151 | struct pt_regs regset; | |
152 | if (ptrace (PTRACE_GETREGSET, lwpid, | |
153 | (PTRACE_TYPE_ARG3) (long) NT_PRSTATUS, ®set) != 0) | |
154 | return PS_ERR; | |
155 | ||
156 | *base = (void *) regset.tls; | |
157 | ||
158 | /* IDX is the bias from the thread pointer to the beginning of the | |
159 | thread descriptor. It has to be subtracted due to implementation | |
160 | quirks in libthread_db. */ | |
161 | *base = (void *) ((char *)*base - idx); | |
162 | ||
163 | return PS_OK; | |
164 | } | |
165 | ||
166 | /* Gdbserver uses PTRACE_GET/SET_RGESET. */ | |
167 | ||
168 | static void | |
169 | csky_fill_pt_gregset (struct regcache *regcache, void *buf) | |
170 | { | |
171 | int i, base; | |
172 | struct pt_regs *regset = (struct pt_regs *)buf; | |
173 | ||
174 | collect_register_by_name (regcache, "r15", ®set->lr); | |
175 | collect_register_by_name (regcache, "pc", ®set->pc); | |
176 | collect_register_by_name (regcache, "psr", ®set->sr); | |
177 | collect_register_by_name (regcache, "r14", ®set->usp); | |
178 | ||
179 | collect_register_by_name (regcache, "r0", ®set->a0); | |
180 | collect_register_by_name (regcache, "r1", ®set->a1); | |
181 | collect_register_by_name (regcache, "r2", ®set->a2); | |
182 | collect_register_by_name (regcache, "r3", ®set->a3); | |
183 | ||
184 | base = find_regno (regcache->tdesc, "r4"); | |
185 | ||
186 | for (i = 0; i < 10; i++) | |
187 | collect_register (regcache, base + i, ®set->regs[i]); | |
188 | ||
189 | base = find_regno (regcache->tdesc, "r16"); | |
190 | for (i = 0; i < 16; i++) | |
191 | collect_register (regcache, base + i, ®set->exregs[i]); | |
192 | ||
193 | collect_register_by_name (regcache, "hi", ®set->rhi); | |
194 | collect_register_by_name (regcache, "lo", ®set->rlo); | |
195 | } | |
196 | ||
197 | static void | |
198 | csky_store_pt_gregset (struct regcache *regcache, const void *buf) | |
199 | { | |
200 | int i, base; | |
201 | const struct pt_regs *regset = (const struct pt_regs *) buf; | |
202 | ||
203 | supply_register_by_name (regcache, "r15", ®set->lr); | |
204 | supply_register_by_name (regcache, "pc", ®set->pc); | |
205 | supply_register_by_name (regcache, "psr", ®set->sr); | |
206 | supply_register_by_name (regcache, "r14", ®set->usp); | |
207 | ||
208 | supply_register_by_name (regcache, "r0", ®set->a0); | |
209 | supply_register_by_name (regcache, "r1", ®set->a1); | |
210 | supply_register_by_name (regcache, "r2", ®set->a2); | |
211 | supply_register_by_name (regcache, "r3", ®set->a3); | |
212 | ||
213 | base = find_regno (regcache->tdesc, "r4"); | |
214 | ||
215 | for (i = 0; i < 10; i++) | |
216 | supply_register (regcache, base + i, ®set->regs[i]); | |
217 | ||
218 | base = find_regno (regcache->tdesc, "r16"); | |
219 | for (i = 0; i < 16; i++) | |
220 | supply_register (regcache, base + i, ®set->exregs[i]); | |
221 | ||
222 | supply_register_by_name (regcache, "hi", ®set->rhi); | |
223 | supply_register_by_name (regcache, "lo", ®set->rlo); | |
224 | } | |
225 | ||
226 | static void | |
227 | csky_fill_pt_vrregset (struct regcache *regcache, void *buf) | |
228 | { | |
229 | int i, base; | |
230 | struct user_fp *regset = (struct user_fp *)buf; | |
231 | ||
232 | base = find_regno (regcache->tdesc, "vr0"); | |
233 | ||
234 | for (i = 0; i < 16; i++) | |
235 | collect_register (regcache, base + i, ®set->vr[i * 4]); | |
236 | collect_register_by_name (regcache, "fcr", ®set->fcr); | |
237 | collect_register_by_name (regcache, "fesr", ®set->fesr); | |
238 | collect_register_by_name (regcache, "fid", ®set->fid); | |
239 | } | |
240 | ||
241 | ||
242 | static void | |
243 | csky_store_pt_vrregset (struct regcache *regcache, const void *buf) | |
244 | { | |
245 | int i, base; | |
246 | const struct user_fp *regset = (const struct user_fp *)buf; | |
247 | ||
248 | base = find_regno (regcache->tdesc, "vr0"); | |
249 | ||
250 | for (i = 0; i < 16; i++) | |
251 | supply_register (regcache, base + i, ®set->vr[i * 4]); | |
252 | ||
253 | base = find_regno (regcache->tdesc, "fr0"); | |
254 | ||
255 | for (i = 0; i < 16; i++) | |
256 | supply_register (regcache, base + i, ®set->vr[i * 4]); | |
257 | supply_register_by_name (regcache, "fcr", ®set->fcr); | |
258 | supply_register_by_name (regcache, "fesr", ®set->fesr); | |
259 | supply_register_by_name (regcache, "fid", ®set->fid); | |
260 | } | |
261 | ||
262 | struct regset_info csky_regsets[] = { | |
263 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, sizeof(struct pt_regs), | |
264 | GENERAL_REGS, csky_fill_pt_gregset, csky_store_pt_gregset}, | |
265 | ||
266 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_FPREGSET, sizeof(struct user_fp), | |
267 | FP_REGS, csky_fill_pt_vrregset, csky_store_pt_vrregset}, | |
268 | NULL_REGSET | |
269 | }; | |
270 | ||
271 | ||
272 | static struct regsets_info csky_regsets_info = | |
273 | { | |
274 | csky_regsets, /* Regsets */ | |
275 | 0, /* Num_regsets */ | |
276 | NULL, /* Disabled_regsets */ | |
277 | }; | |
278 | ||
279 | ||
280 | static struct regs_info csky_regs_info = | |
281 | { | |
282 | NULL, /* FIXME: what's this */ | |
33b5899f | 283 | NULL, /* PEEKUSER/POKEUSR isn't supported by kernel > 4.x */ |
02cd1b4e JL |
284 | &csky_regsets_info |
285 | }; | |
286 | ||
287 | ||
288 | const regs_info * | |
289 | csky_target::get_regs_info () | |
290 | { | |
291 | return &csky_regs_info; | |
292 | } | |
293 | ||
294 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ | |
295 | ||
296 | const gdb_byte * | |
297 | csky_target::sw_breakpoint_from_kind (int kind, int *size) | |
298 | { | |
299 | if (kind == 4) | |
300 | { | |
301 | *size = 4; | |
302 | return (const gdb_byte *) &csky_breakpoint_illegal_4_v2; | |
303 | } | |
304 | else | |
305 | { | |
306 | *size = 2; | |
307 | return (const gdb_byte *) &csky_breakpoint_illegal_2_v2; | |
308 | } | |
309 | } | |
310 | ||
311 | bool | |
312 | csky_target::supports_z_point_type (char z_type) | |
313 | { | |
314 | /* FIXME: hardware breakpoint support ?? */ | |
315 | if (z_type == Z_PACKET_SW_BP) | |
316 | return true; | |
317 | ||
318 | return false; | |
319 | } | |
320 | ||
321 | bool | |
322 | csky_target::low_breakpoint_at (CORE_ADDR where) | |
323 | { | |
324 | unsigned int insn; | |
325 | ||
326 | /* Here just read 2 bytes, as csky_breakpoint_illegal_4_v2 | |
327 | is double of csky_breakpoint_illegal_2_v2, csky_breakpoint_bkpt_4 | |
328 | is double of csky_breakpoint_bkpt_2. Others are 2 bytes bkpt. */ | |
329 | read_memory (where, (unsigned char *) &insn, 2); | |
330 | ||
331 | if (insn == csky_breakpoint_illegal_2_v2) | |
332 | return true; | |
333 | ||
334 | return false; | |
335 | } | |
336 | ||
337 | /* Support for hardware single step. */ | |
338 | ||
339 | bool | |
340 | csky_target::supports_hardware_single_step () | |
341 | { | |
342 | return true; | |
343 | } | |
344 | ||
345 | /* The linux target ops object. */ | |
346 | ||
347 | linux_process_target *the_linux_target = &the_csky_target; | |
348 | ||
349 | void | |
350 | initialize_low_arch (void) | |
351 | { | |
352 | initialize_regsets_info (&csky_regsets_info); | |
353 | } |