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2e8cf49e NC |
1 | /* interp.c -- AArch64 sim interface to GDB. |
2 | ||
213516ef | 3 | Copyright (C) 2015-2023 Free Software Foundation, Inc. |
2e8cf49e NC |
4 | |
5 | Contributed by Red Hat. | |
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 | ||
6df01ab8 MF |
22 | /* This must come before any other includes. */ |
23 | #include "defs.h" | |
24 | ||
2e8cf49e NC |
25 | #include <stdio.h> |
26 | #include <assert.h> | |
27 | #include <signal.h> | |
28 | #include <string.h> | |
29 | #include <ctype.h> | |
30 | #include <stdlib.h> | |
31 | ||
32 | #include "ansidecl.h" | |
5357150c | 33 | #include "bfd.h" |
df68e12b MF |
34 | #include "sim/callback.h" |
35 | #include "sim/sim.h" | |
2e8cf49e | 36 | #include "gdb/signals.h" |
d026e67e | 37 | #include "sim/sim-aarch64.h" |
2e8cf49e NC |
38 | |
39 | #include "sim-main.h" | |
40 | #include "sim-options.h" | |
41 | #include "memory.h" | |
42 | #include "simulator.h" | |
cd5b6074 | 43 | #include "sim-assert.h" |
2e8cf49e | 44 | |
e24a921d MF |
45 | #include "aarch64-sim.h" |
46 | ||
2e8cf49e NC |
47 | /* Filter out (in place) symbols that are useless for disassembly. |
48 | COUNT is the number of elements in SYMBOLS. | |
49 | Return the number of useful symbols. */ | |
50 | ||
5357150c MF |
51 | static long |
52 | remove_useless_symbols (asymbol **symbols, long count) | |
2e8cf49e NC |
53 | { |
54 | asymbol **in_ptr = symbols; | |
55 | asymbol **out_ptr = symbols; | |
56 | ||
57 | while (count-- > 0) | |
58 | { | |
59 | asymbol *sym = *in_ptr++; | |
60 | ||
61 | if (strstr (sym->name, "gcc2_compiled")) | |
62 | continue; | |
63 | if (sym->name == NULL || sym->name[0] == '\0') | |
64 | continue; | |
65 | if (sym->flags & (BSF_DEBUGGING)) | |
66 | continue; | |
67 | if ( bfd_is_und_section (sym->section) | |
68 | || bfd_is_com_section (sym->section)) | |
69 | continue; | |
70 | if (sym->name[0] == '$') | |
71 | continue; | |
72 | ||
73 | *out_ptr++ = sym; | |
74 | } | |
75 | return out_ptr - symbols; | |
76 | } | |
77 | ||
78 | static signed int | |
79 | compare_symbols (const void *ap, const void *bp) | |
80 | { | |
81 | const asymbol *a = * (const asymbol **) ap; | |
82 | const asymbol *b = * (const asymbol **) bp; | |
83 | ||
84 | if (bfd_asymbol_value (a) > bfd_asymbol_value (b)) | |
85 | return 1; | |
86 | if (bfd_asymbol_value (a) < bfd_asymbol_value (b)) | |
87 | return -1; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | /* Find the name of the function at ADDR. */ | |
92 | const char * | |
5357150c | 93 | aarch64_get_func (SIM_DESC sd, uint64_t addr) |
2e8cf49e | 94 | { |
5357150c MF |
95 | long symcount = STATE_PROG_SYMS_COUNT (sd); |
96 | asymbol **symtab = STATE_PROG_SYMS (sd); | |
2e8cf49e NC |
97 | int min, max; |
98 | ||
99 | min = -1; | |
100 | max = symcount; | |
101 | while (min < max - 1) | |
102 | { | |
103 | int sym; | |
104 | bfd_vma sa; | |
105 | ||
106 | sym = (min + max) / 2; | |
107 | sa = bfd_asymbol_value (symtab[sym]); | |
108 | ||
109 | if (sa > addr) | |
110 | max = sym; | |
111 | else if (sa < addr) | |
112 | min = sym; | |
113 | else | |
114 | { | |
115 | min = sym; | |
116 | break; | |
117 | } | |
118 | } | |
119 | ||
120 | if (min != -1) | |
121 | return bfd_asymbol_name (symtab [min]); | |
122 | ||
123 | return ""; | |
124 | } | |
125 | ||
2e8cf49e | 126 | SIM_RC |
2e3d4f4d MF |
127 | sim_create_inferior (SIM_DESC sd, struct bfd *abfd, |
128 | char * const *argv, char * const *env) | |
2e8cf49e NC |
129 | { |
130 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
8cfc9a18 | 131 | host_callback *cb = STATE_CALLBACK (sd); |
2e8cf49e NC |
132 | bfd_vma addr = 0; |
133 | ||
134 | if (abfd != NULL) | |
135 | addr = bfd_get_start_address (abfd); | |
136 | ||
137 | aarch64_set_next_PC (cpu, addr); | |
138 | aarch64_update_PC (cpu); | |
139 | ||
0e967299 MF |
140 | /* Standalone mode (i.e. `run`) will take care of the argv for us in |
141 | sim_open() -> sim_parse_args(). But in debug mode (i.e. 'target sim' | |
142 | with `gdb`), we need to handle it because the user can change the | |
143 | argv on the fly via gdb's 'run'. */ | |
144 | if (STATE_PROG_ARGV (sd) != argv) | |
2e8cf49e NC |
145 | { |
146 | freeargv (STATE_PROG_ARGV (sd)); | |
147 | STATE_PROG_ARGV (sd) = dupargv (argv); | |
148 | } | |
149 | ||
54f7a83a MF |
150 | if (STATE_PROG_ENVP (sd) != env) |
151 | { | |
152 | freeargv (STATE_PROG_ENVP (sd)); | |
153 | STATE_PROG_ENVP (sd) = dupargv (env); | |
154 | } | |
155 | ||
8cfc9a18 MF |
156 | cb->argv = STATE_PROG_ARGV (sd); |
157 | cb->envp = STATE_PROG_ENVP (sd); | |
158 | ||
5357150c | 159 | if (trace_load_symbols (sd)) |
2e8cf49e | 160 | { |
5357150c MF |
161 | STATE_PROG_SYMS_COUNT (sd) = |
162 | remove_useless_symbols (STATE_PROG_SYMS (sd), | |
163 | STATE_PROG_SYMS_COUNT (sd)); | |
164 | qsort (STATE_PROG_SYMS (sd), STATE_PROG_SYMS_COUNT (sd), | |
165 | sizeof (asymbol *), compare_symbols); | |
2e8cf49e NC |
166 | } |
167 | ||
6a277579 | 168 | aarch64_init (cpu, addr); |
2e8cf49e NC |
169 | |
170 | return SIM_RC_OK; | |
171 | } | |
172 | ||
173 | /* Read the LENGTH bytes at BUF as a little-endian value. */ | |
174 | ||
175 | static bfd_vma | |
ed60d3ed | 176 | get_le (const unsigned char *buf, unsigned int length) |
2e8cf49e NC |
177 | { |
178 | bfd_vma acc = 0; | |
179 | ||
180 | while (length -- > 0) | |
181 | acc = (acc << 8) + buf[length]; | |
182 | ||
183 | return acc; | |
184 | } | |
185 | ||
186 | /* Store VAL as a little-endian value in the LENGTH bytes at BUF. */ | |
187 | ||
188 | static void | |
189 | put_le (unsigned char *buf, unsigned int length, bfd_vma val) | |
190 | { | |
191 | int i; | |
192 | ||
193 | for (i = 0; i < length; i++) | |
194 | { | |
195 | buf[i] = val & 0xff; | |
196 | val >>= 8; | |
197 | } | |
198 | } | |
199 | ||
200 | static int | |
201 | check_regno (int regno) | |
202 | { | |
203 | return 0 <= regno && regno < AARCH64_MAX_REGNO; | |
204 | } | |
205 | ||
206 | static size_t | |
207 | reg_size (int regno) | |
208 | { | |
209 | if (regno == AARCH64_CPSR_REGNO || regno == AARCH64_FPSR_REGNO) | |
210 | return 32; | |
211 | return 64; | |
212 | } | |
213 | ||
214 | static int | |
ee1cffd3 | 215 | aarch64_reg_get (SIM_CPU *cpu, int regno, void *buf, int length) |
2e8cf49e NC |
216 | { |
217 | size_t size; | |
218 | bfd_vma val; | |
219 | ||
220 | if (!check_regno (regno)) | |
221 | return 0; | |
222 | ||
223 | size = reg_size (regno); | |
224 | ||
225 | if (length != size) | |
226 | return 0; | |
227 | ||
228 | switch (regno) | |
229 | { | |
230 | case AARCH64_MIN_GR ... AARCH64_MAX_GR: | |
231 | val = aarch64_get_reg_u64 (cpu, regno, 0); | |
232 | break; | |
233 | ||
234 | case AARCH64_MIN_FR ... AARCH64_MAX_FR: | |
235 | val = aarch64_get_FP_double (cpu, regno - 32); | |
236 | break; | |
237 | ||
238 | case AARCH64_PC_REGNO: | |
239 | val = aarch64_get_PC (cpu); | |
240 | break; | |
241 | ||
242 | case AARCH64_CPSR_REGNO: | |
243 | val = aarch64_get_CPSR (cpu); | |
244 | break; | |
245 | ||
246 | case AARCH64_FPSR_REGNO: | |
247 | val = aarch64_get_FPSR (cpu); | |
248 | break; | |
249 | ||
250 | default: | |
251 | sim_io_eprintf (CPU_STATE (cpu), | |
252 | "sim: unrecognized register number: %d\n", regno); | |
253 | return -1; | |
254 | } | |
255 | ||
256 | put_le (buf, length, val); | |
257 | ||
258 | return size; | |
259 | } | |
260 | ||
261 | static int | |
ee1cffd3 | 262 | aarch64_reg_set (SIM_CPU *cpu, int regno, const void *buf, int length) |
2e8cf49e NC |
263 | { |
264 | size_t size; | |
265 | bfd_vma val; | |
266 | ||
267 | if (!check_regno (regno)) | |
268 | return -1; | |
269 | ||
270 | size = reg_size (regno); | |
271 | ||
272 | if (length != size) | |
273 | return -1; | |
274 | ||
275 | val = get_le (buf, length); | |
276 | ||
277 | switch (regno) | |
278 | { | |
279 | case AARCH64_MIN_GR ... AARCH64_MAX_GR: | |
280 | aarch64_set_reg_u64 (cpu, regno, 1, val); | |
281 | break; | |
282 | ||
283 | case AARCH64_MIN_FR ... AARCH64_MAX_FR: | |
284 | aarch64_set_FP_double (cpu, regno - 32, (double) val); | |
285 | break; | |
286 | ||
287 | case AARCH64_PC_REGNO: | |
288 | aarch64_set_next_PC (cpu, val); | |
289 | aarch64_update_PC (cpu); | |
290 | break; | |
291 | ||
292 | case AARCH64_CPSR_REGNO: | |
293 | aarch64_set_CPSR (cpu, val); | |
294 | break; | |
295 | ||
296 | case AARCH64_FPSR_REGNO: | |
297 | aarch64_set_FPSR (cpu, val); | |
298 | break; | |
299 | ||
300 | default: | |
301 | sim_io_eprintf (CPU_STATE (cpu), | |
302 | "sim: unrecognized register number: %d\n", regno); | |
303 | return 0; | |
304 | } | |
305 | ||
306 | return size; | |
307 | } | |
308 | ||
309 | static sim_cia | |
310 | aarch64_pc_get (sim_cpu *cpu) | |
311 | { | |
312 | return aarch64_get_PC (cpu); | |
313 | } | |
314 | ||
315 | static void | |
316 | aarch64_pc_set (sim_cpu *cpu, sim_cia pc) | |
317 | { | |
318 | aarch64_set_next_PC (cpu, pc); | |
319 | aarch64_update_PC (cpu); | |
320 | } | |
321 | ||
322 | static void | |
323 | free_state (SIM_DESC sd) | |
324 | { | |
325 | if (STATE_MODULES (sd) != NULL) | |
326 | sim_module_uninstall (sd); | |
327 | sim_cpu_free_all (sd); | |
328 | sim_state_free (sd); | |
329 | } | |
330 | ||
2e8cf49e NC |
331 | SIM_DESC |
332 | sim_open (SIM_OPEN_KIND kind, | |
333 | struct host_callback_struct * callback, | |
334 | struct bfd * abfd, | |
2e3d4f4d | 335 | char * const * argv) |
2e8cf49e | 336 | { |
2e8cf49e NC |
337 | sim_cpu *cpu; |
338 | SIM_DESC sd = sim_state_alloc (kind, callback); | |
339 | ||
340 | if (sd == NULL) | |
341 | return sd; | |
342 | ||
343 | SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); | |
344 | ||
ba307cdd MF |
345 | /* We use NONSTRICT_ALIGNMENT as the default because AArch64 only enforces |
346 | 4-byte alignment, even for 8-byte reads/writes. The common core does not | |
347 | support this, so we opt for non-strict alignment instead. */ | |
348 | current_alignment = NONSTRICT_ALIGNMENT; | |
349 | ||
2e8cf49e | 350 | /* Perform the initialization steps one by one. */ |
883be197 | 351 | if (sim_cpu_alloc_all_extra (sd, 0, sizeof (struct aarch64_sim_cpu)) |
6a08ae19 | 352 | != SIM_RC_OK |
2e8cf49e NC |
353 | || sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK |
354 | || sim_parse_args (sd, argv) != SIM_RC_OK | |
e8f20a28 | 355 | || sim_analyze_program (sd, STATE_PROG_FILE (sd), abfd) != SIM_RC_OK |
2e8cf49e NC |
356 | || sim_config (sd) != SIM_RC_OK |
357 | || sim_post_argv_init (sd) != SIM_RC_OK) | |
358 | { | |
359 | free_state (sd); | |
360 | return NULL; | |
361 | } | |
362 | ||
363 | aarch64_init_LIT_table (); | |
364 | ||
365 | assert (MAX_NR_PROCESSORS == 1); | |
366 | cpu = STATE_CPU (sd, 0); | |
367 | CPU_PC_FETCH (cpu) = aarch64_pc_get; | |
368 | CPU_PC_STORE (cpu) = aarch64_pc_set; | |
369 | CPU_REG_FETCH (cpu) = aarch64_reg_get; | |
370 | CPU_REG_STORE (cpu) = aarch64_reg_set; | |
371 | ||
372 | /* Set SP, FP and PC to 0 and set LR to -1 | |
373 | so we can detect a top-level return. */ | |
374 | aarch64_set_reg_u64 (cpu, SP, 1, 0); | |
375 | aarch64_set_reg_u64 (cpu, FP, 1, 0); | |
376 | aarch64_set_reg_u64 (cpu, LR, 1, TOP_LEVEL_RETURN_PC); | |
377 | aarch64_set_next_PC (cpu, 0); | |
378 | aarch64_update_PC (cpu); | |
379 | ||
380 | /* Default to a 128 Mbyte (== 2^27) memory space. */ | |
381 | sim_do_commandf (sd, "memory-size 0x8000000"); | |
382 | ||
383 | return sd; | |
384 | } | |
385 | ||
386 | void | |
387 | sim_engine_run (SIM_DESC sd, | |
388 | int next_cpu_nr ATTRIBUTE_UNUSED, | |
389 | int nr_cpus ATTRIBUTE_UNUSED, | |
390 | int siggnal ATTRIBUTE_UNUSED) | |
391 | { | |
392 | aarch64_run (sd); | |
393 | } |