]>
Commit | Line | Data |
---|---|---|
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 | ||
19 | #include "server.h" | |
20 | #include "tdesc.h" | |
21 | #include "linux-low.h" | |
22 | #include <sys/ptrace.h> | |
23 | #include "gdb_proc_service.h" | |
24 | #include <asm/ptrace.h> | |
25 | #include <elf.h> | |
26 | #include "arch/csky.h" | |
27 | ||
28 | /* Linux target op definitions for the CSKY architecture. */ | |
29 | ||
30 | class csky_target : public linux_process_target | |
31 | { | |
32 | public: | |
33 | ||
34 | const regs_info *get_regs_info () override; | |
35 | ||
36 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; | |
37 | ||
38 | bool supports_z_point_type (char z_type) override; | |
39 | ||
40 | bool supports_hardware_single_step () override; | |
41 | ||
42 | protected: | |
43 | ||
44 | void low_arch_setup () override; | |
45 | ||
46 | bool low_cannot_fetch_register (int regno) override; | |
47 | ||
48 | bool low_cannot_store_register (int regno) 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 csky_target the_csky_target; | |
60 | ||
61 | /* Return the ptrace "address" of register REGNO. */ | |
62 | static int csky_regmap[] = { | |
63 | 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, | |
64 | 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, | |
65 | 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, | |
66 | 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, | |
67 | -1, -1, -1, -1, 34*4, 35*4, -1, -1, | |
68 | 40*4, 42*4, 44*4, 46*4, 48*4, 50*4, 52*4, 54*4, /* fr0 ~ fr15, 64bit */ | |
69 | 56*4, 58*4, 60*4, 62*4, 64*4, 66*4, 68*4, 70*4, | |
70 | 72*4, 76*4, 80*4, 84*4, 88*4, 92*4, 96*4,100*4, /* vr0 ~ vr15, 128bit */ | |
71 | 104*4,108*4,112*4,116*4,120*4,124*4,128*4,132*4, | |
72 | 33*4, /* pc */ | |
73 | -1, -1, -1, -1, -1, -1, -1, -1, | |
74 | -1, -1, -1, -1, -1, -1, -1, -1, | |
75 | 32*4, -1, -1, -1, -1, -1, -1, -1, /* psr */ | |
76 | -1, -1, -1, -1, -1, -1, -1, -1, | |
77 | -1, -1, -1, -1, -1, -1, -1, -1, | |
78 | -1, -1, -1, -1, -1, -1, -1, -1, | |
79 | 73*4, 72*4, 74*4, -1, -1, -1, 14*4, /* fcr, fid, fesr, usp */ | |
80 | }; | |
81 | ||
82 | /* CSKY software breakpoint instruction code. */ | |
83 | ||
84 | /* When the kernel code version is behind v4.x, | |
85 | illegal insn 0x1464 will be a software bkpt trigger. | |
86 | When an illegal insn exception happens, the case | |
87 | that insn at EPC is 0x1464 will be recognized as SIGTRAP. */ | |
88 | static unsigned short csky_breakpoint_illegal_2_v2 = 0x1464; | |
89 | static unsigned int csky_breakpoint_illegal_4_v2 = 0x14641464; | |
90 | ||
91 | bool | |
92 | csky_target::low_cannot_fetch_register (int regno) | |
93 | { | |
94 | if (csky_regmap[regno] == -1) | |
95 | return true; | |
96 | ||
97 | return false; | |
98 | } | |
99 | ||
100 | bool | |
101 | csky_target::low_cannot_store_register (int regno) | |
102 | { | |
103 | if (csky_regmap[regno] == -1) | |
104 | return true; | |
105 | ||
106 | return false; | |
107 | } | |
108 | ||
109 | /* Get the value of pc register. */ | |
110 | ||
111 | CORE_ADDR | |
112 | csky_target::low_get_pc (struct regcache *regcache) | |
113 | { | |
114 | unsigned long pc; | |
115 | collect_register_by_name (regcache, "pc", &pc); | |
116 | return pc; | |
117 | } | |
118 | ||
119 | /* Set pc register. */ | |
120 | ||
121 | void | |
122 | csky_target::low_set_pc (struct regcache *regcache, CORE_ADDR pc) | |
123 | { | |
124 | unsigned long new_pc = pc; | |
125 | supply_register_by_name (regcache, "pc", &new_pc); | |
126 | } | |
127 | ||
128 | ||
129 | void | |
130 | csky_target::low_arch_setup () | |
131 | { | |
132 | static const char *expedite_regs[] = { "r14", "pc", NULL }; | |
133 | target_desc_up tdesc = csky_create_target_description (); | |
134 | ||
dd6a9ec1 AB |
135 | if (tdesc->expedite_regs.empty ()) |
136 | { | |
137 | init_target_desc (tdesc.get (), expedite_regs); | |
138 | gdb_assert (!tdesc->expedite_regs.empty ()); | |
139 | } | |
02cd1b4e JL |
140 | |
141 | current_process ()->tdesc = tdesc.release (); | |
142 | ||
143 | return; | |
144 | } | |
145 | ||
146 | /* Fetch the thread-local storage pointer for libthread_db. */ | |
147 | ||
148 | ps_err_e | |
149 | ps_get_thread_area (struct ps_prochandle *ph, | |
150 | lwpid_t lwpid, int idx, void **base) | |
151 | { | |
152 | struct pt_regs regset; | |
153 | if (ptrace (PTRACE_GETREGSET, lwpid, | |
154 | (PTRACE_TYPE_ARG3) (long) NT_PRSTATUS, ®set) != 0) | |
155 | return PS_ERR; | |
156 | ||
157 | *base = (void *) regset.tls; | |
158 | ||
159 | /* IDX is the bias from the thread pointer to the beginning of the | |
160 | thread descriptor. It has to be subtracted due to implementation | |
161 | quirks in libthread_db. */ | |
162 | *base = (void *) ((char *)*base - idx); | |
163 | ||
164 | return PS_OK; | |
165 | } | |
166 | ||
167 | /* Gdbserver uses PTRACE_GET/SET_RGESET. */ | |
168 | ||
169 | static void | |
170 | csky_fill_pt_gregset (struct regcache *regcache, void *buf) | |
171 | { | |
172 | int i, base; | |
173 | struct pt_regs *regset = (struct pt_regs *)buf; | |
174 | ||
175 | collect_register_by_name (regcache, "r15", ®set->lr); | |
176 | collect_register_by_name (regcache, "pc", ®set->pc); | |
177 | collect_register_by_name (regcache, "psr", ®set->sr); | |
178 | collect_register_by_name (regcache, "r14", ®set->usp); | |
179 | ||
180 | collect_register_by_name (regcache, "r0", ®set->a0); | |
181 | collect_register_by_name (regcache, "r1", ®set->a1); | |
182 | collect_register_by_name (regcache, "r2", ®set->a2); | |
183 | collect_register_by_name (regcache, "r3", ®set->a3); | |
184 | ||
185 | base = find_regno (regcache->tdesc, "r4"); | |
186 | ||
187 | for (i = 0; i < 10; i++) | |
188 | collect_register (regcache, base + i, ®set->regs[i]); | |
189 | ||
190 | base = find_regno (regcache->tdesc, "r16"); | |
191 | for (i = 0; i < 16; i++) | |
192 | collect_register (regcache, base + i, ®set->exregs[i]); | |
193 | ||
194 | collect_register_by_name (regcache, "hi", ®set->rhi); | |
195 | collect_register_by_name (regcache, "lo", ®set->rlo); | |
196 | } | |
197 | ||
198 | static void | |
199 | csky_store_pt_gregset (struct regcache *regcache, const void *buf) | |
200 | { | |
201 | int i, base; | |
202 | const struct pt_regs *regset = (const struct pt_regs *) buf; | |
203 | ||
204 | supply_register_by_name (regcache, "r15", ®set->lr); | |
205 | supply_register_by_name (regcache, "pc", ®set->pc); | |
206 | supply_register_by_name (regcache, "psr", ®set->sr); | |
207 | supply_register_by_name (regcache, "r14", ®set->usp); | |
208 | ||
209 | supply_register_by_name (regcache, "r0", ®set->a0); | |
210 | supply_register_by_name (regcache, "r1", ®set->a1); | |
211 | supply_register_by_name (regcache, "r2", ®set->a2); | |
212 | supply_register_by_name (regcache, "r3", ®set->a3); | |
213 | ||
214 | base = find_regno (regcache->tdesc, "r4"); | |
215 | ||
216 | for (i = 0; i < 10; i++) | |
217 | supply_register (regcache, base + i, ®set->regs[i]); | |
218 | ||
219 | base = find_regno (regcache->tdesc, "r16"); | |
220 | for (i = 0; i < 16; i++) | |
221 | supply_register (regcache, base + i, ®set->exregs[i]); | |
222 | ||
223 | supply_register_by_name (regcache, "hi", ®set->rhi); | |
224 | supply_register_by_name (regcache, "lo", ®set->rlo); | |
225 | } | |
226 | ||
227 | static void | |
228 | csky_fill_pt_vrregset (struct regcache *regcache, void *buf) | |
229 | { | |
230 | int i, base; | |
231 | struct user_fp *regset = (struct user_fp *)buf; | |
232 | ||
233 | base = find_regno (regcache->tdesc, "vr0"); | |
234 | ||
235 | for (i = 0; i < 16; i++) | |
236 | collect_register (regcache, base + i, ®set->vr[i * 4]); | |
237 | collect_register_by_name (regcache, "fcr", ®set->fcr); | |
238 | collect_register_by_name (regcache, "fesr", ®set->fesr); | |
239 | collect_register_by_name (regcache, "fid", ®set->fid); | |
240 | } | |
241 | ||
242 | ||
243 | static void | |
244 | csky_store_pt_vrregset (struct regcache *regcache, const void *buf) | |
245 | { | |
246 | int i, base; | |
247 | const struct user_fp *regset = (const struct user_fp *)buf; | |
248 | ||
249 | base = find_regno (regcache->tdesc, "vr0"); | |
250 | ||
251 | for (i = 0; i < 16; i++) | |
252 | supply_register (regcache, base + i, ®set->vr[i * 4]); | |
253 | ||
254 | base = find_regno (regcache->tdesc, "fr0"); | |
255 | ||
256 | for (i = 0; i < 16; i++) | |
257 | supply_register (regcache, base + i, ®set->vr[i * 4]); | |
258 | supply_register_by_name (regcache, "fcr", ®set->fcr); | |
259 | supply_register_by_name (regcache, "fesr", ®set->fesr); | |
260 | supply_register_by_name (regcache, "fid", ®set->fid); | |
261 | } | |
262 | ||
263 | struct regset_info csky_regsets[] = { | |
264 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, sizeof(struct pt_regs), | |
265 | GENERAL_REGS, csky_fill_pt_gregset, csky_store_pt_gregset}, | |
266 | ||
267 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_FPREGSET, sizeof(struct user_fp), | |
268 | FP_REGS, csky_fill_pt_vrregset, csky_store_pt_vrregset}, | |
269 | NULL_REGSET | |
270 | }; | |
271 | ||
272 | ||
273 | static struct regsets_info csky_regsets_info = | |
274 | { | |
275 | csky_regsets, /* Regsets */ | |
276 | 0, /* Num_regsets */ | |
277 | NULL, /* Disabled_regsets */ | |
278 | }; | |
279 | ||
280 | ||
281 | static struct regs_info csky_regs_info = | |
282 | { | |
283 | NULL, /* FIXME: what's this */ | |
33b5899f | 284 | NULL, /* PEEKUSER/POKEUSR isn't supported by kernel > 4.x */ |
02cd1b4e JL |
285 | &csky_regsets_info |
286 | }; | |
287 | ||
288 | ||
289 | const regs_info * | |
290 | csky_target::get_regs_info () | |
291 | { | |
292 | return &csky_regs_info; | |
293 | } | |
294 | ||
295 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ | |
296 | ||
297 | const gdb_byte * | |
298 | csky_target::sw_breakpoint_from_kind (int kind, int *size) | |
299 | { | |
300 | if (kind == 4) | |
301 | { | |
302 | *size = 4; | |
303 | return (const gdb_byte *) &csky_breakpoint_illegal_4_v2; | |
304 | } | |
305 | else | |
306 | { | |
307 | *size = 2; | |
308 | return (const gdb_byte *) &csky_breakpoint_illegal_2_v2; | |
309 | } | |
310 | } | |
311 | ||
312 | bool | |
313 | csky_target::supports_z_point_type (char z_type) | |
314 | { | |
315 | /* FIXME: hardware breakpoint support ?? */ | |
316 | if (z_type == Z_PACKET_SW_BP) | |
317 | return true; | |
318 | ||
319 | return false; | |
320 | } | |
321 | ||
322 | bool | |
323 | csky_target::low_breakpoint_at (CORE_ADDR where) | |
324 | { | |
325 | unsigned int insn; | |
326 | ||
327 | /* Here just read 2 bytes, as csky_breakpoint_illegal_4_v2 | |
328 | is double of csky_breakpoint_illegal_2_v2, csky_breakpoint_bkpt_4 | |
329 | is double of csky_breakpoint_bkpt_2. Others are 2 bytes bkpt. */ | |
330 | read_memory (where, (unsigned char *) &insn, 2); | |
331 | ||
332 | if (insn == csky_breakpoint_illegal_2_v2) | |
333 | return true; | |
334 | ||
335 | return false; | |
336 | } | |
337 | ||
338 | /* Support for hardware single step. */ | |
339 | ||
340 | bool | |
341 | csky_target::supports_hardware_single_step () | |
342 | { | |
343 | return true; | |
344 | } | |
345 | ||
346 | /* The linux target ops object. */ | |
347 | ||
348 | linux_process_target *the_linux_target = &the_csky_target; | |
349 | ||
350 | void | |
351 | initialize_low_arch (void) | |
352 | { | |
353 | initialize_regsets_info (&csky_regsets_info); | |
354 | } |