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2e8cf49e NC |
1 | /* interp.c -- AArch64 sim interface to GDB. |
2 | ||
3666a048 | 3 | Copyright (C) 2015-2021 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 NC |
36 | #include "gdb/signals.h" |
37 | #include "gdb/sim-aarch64.h" | |
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 | |
2e8cf49e NC |
45 | /* Filter out (in place) symbols that are useless for disassembly. |
46 | COUNT is the number of elements in SYMBOLS. | |
47 | Return the number of useful symbols. */ | |
48 | ||
5357150c MF |
49 | static long |
50 | remove_useless_symbols (asymbol **symbols, long count) | |
2e8cf49e NC |
51 | { |
52 | asymbol **in_ptr = symbols; | |
53 | asymbol **out_ptr = symbols; | |
54 | ||
55 | while (count-- > 0) | |
56 | { | |
57 | asymbol *sym = *in_ptr++; | |
58 | ||
59 | if (strstr (sym->name, "gcc2_compiled")) | |
60 | continue; | |
61 | if (sym->name == NULL || sym->name[0] == '\0') | |
62 | continue; | |
63 | if (sym->flags & (BSF_DEBUGGING)) | |
64 | continue; | |
65 | if ( bfd_is_und_section (sym->section) | |
66 | || bfd_is_com_section (sym->section)) | |
67 | continue; | |
68 | if (sym->name[0] == '$') | |
69 | continue; | |
70 | ||
71 | *out_ptr++ = sym; | |
72 | } | |
73 | return out_ptr - symbols; | |
74 | } | |
75 | ||
76 | static signed int | |
77 | compare_symbols (const void *ap, const void *bp) | |
78 | { | |
79 | const asymbol *a = * (const asymbol **) ap; | |
80 | const asymbol *b = * (const asymbol **) bp; | |
81 | ||
82 | if (bfd_asymbol_value (a) > bfd_asymbol_value (b)) | |
83 | return 1; | |
84 | if (bfd_asymbol_value (a) < bfd_asymbol_value (b)) | |
85 | return -1; | |
86 | return 0; | |
87 | } | |
88 | ||
89 | /* Find the name of the function at ADDR. */ | |
90 | const char * | |
5357150c | 91 | aarch64_get_func (SIM_DESC sd, uint64_t addr) |
2e8cf49e | 92 | { |
5357150c MF |
93 | long symcount = STATE_PROG_SYMS_COUNT (sd); |
94 | asymbol **symtab = STATE_PROG_SYMS (sd); | |
2e8cf49e NC |
95 | int min, max; |
96 | ||
97 | min = -1; | |
98 | max = symcount; | |
99 | while (min < max - 1) | |
100 | { | |
101 | int sym; | |
102 | bfd_vma sa; | |
103 | ||
104 | sym = (min + max) / 2; | |
105 | sa = bfd_asymbol_value (symtab[sym]); | |
106 | ||
107 | if (sa > addr) | |
108 | max = sym; | |
109 | else if (sa < addr) | |
110 | min = sym; | |
111 | else | |
112 | { | |
113 | min = sym; | |
114 | break; | |
115 | } | |
116 | } | |
117 | ||
118 | if (min != -1) | |
119 | return bfd_asymbol_name (symtab [min]); | |
120 | ||
121 | return ""; | |
122 | } | |
123 | ||
2e8cf49e | 124 | SIM_RC |
2e3d4f4d MF |
125 | sim_create_inferior (SIM_DESC sd, struct bfd *abfd, |
126 | char * const *argv, char * const *env) | |
2e8cf49e NC |
127 | { |
128 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
2e8cf49e NC |
129 | bfd_vma addr = 0; |
130 | ||
131 | if (abfd != NULL) | |
132 | addr = bfd_get_start_address (abfd); | |
133 | ||
134 | aarch64_set_next_PC (cpu, addr); | |
135 | aarch64_update_PC (cpu); | |
136 | ||
0e967299 MF |
137 | /* Standalone mode (i.e. `run`) will take care of the argv for us in |
138 | sim_open() -> sim_parse_args(). But in debug mode (i.e. 'target sim' | |
139 | with `gdb`), we need to handle it because the user can change the | |
140 | argv on the fly via gdb's 'run'. */ | |
141 | if (STATE_PROG_ARGV (sd) != argv) | |
2e8cf49e NC |
142 | { |
143 | freeargv (STATE_PROG_ARGV (sd)); | |
144 | STATE_PROG_ARGV (sd) = dupargv (argv); | |
145 | } | |
146 | ||
5357150c | 147 | if (trace_load_symbols (sd)) |
2e8cf49e | 148 | { |
5357150c MF |
149 | STATE_PROG_SYMS_COUNT (sd) = |
150 | remove_useless_symbols (STATE_PROG_SYMS (sd), | |
151 | STATE_PROG_SYMS_COUNT (sd)); | |
152 | qsort (STATE_PROG_SYMS (sd), STATE_PROG_SYMS_COUNT (sd), | |
153 | sizeof (asymbol *), compare_symbols); | |
2e8cf49e NC |
154 | } |
155 | ||
6a277579 | 156 | aarch64_init (cpu, addr); |
2e8cf49e NC |
157 | |
158 | return SIM_RC_OK; | |
159 | } | |
160 | ||
161 | /* Read the LENGTH bytes at BUF as a little-endian value. */ | |
162 | ||
163 | static bfd_vma | |
164 | get_le (unsigned char *buf, unsigned int length) | |
165 | { | |
166 | bfd_vma acc = 0; | |
167 | ||
168 | while (length -- > 0) | |
169 | acc = (acc << 8) + buf[length]; | |
170 | ||
171 | return acc; | |
172 | } | |
173 | ||
174 | /* Store VAL as a little-endian value in the LENGTH bytes at BUF. */ | |
175 | ||
176 | static void | |
177 | put_le (unsigned char *buf, unsigned int length, bfd_vma val) | |
178 | { | |
179 | int i; | |
180 | ||
181 | for (i = 0; i < length; i++) | |
182 | { | |
183 | buf[i] = val & 0xff; | |
184 | val >>= 8; | |
185 | } | |
186 | } | |
187 | ||
188 | static int | |
189 | check_regno (int regno) | |
190 | { | |
191 | return 0 <= regno && regno < AARCH64_MAX_REGNO; | |
192 | } | |
193 | ||
194 | static size_t | |
195 | reg_size (int regno) | |
196 | { | |
197 | if (regno == AARCH64_CPSR_REGNO || regno == AARCH64_FPSR_REGNO) | |
198 | return 32; | |
199 | return 64; | |
200 | } | |
201 | ||
202 | static int | |
203 | aarch64_reg_get (SIM_CPU *cpu, int regno, unsigned char *buf, int length) | |
204 | { | |
205 | size_t size; | |
206 | bfd_vma val; | |
207 | ||
208 | if (!check_regno (regno)) | |
209 | return 0; | |
210 | ||
211 | size = reg_size (regno); | |
212 | ||
213 | if (length != size) | |
214 | return 0; | |
215 | ||
216 | switch (regno) | |
217 | { | |
218 | case AARCH64_MIN_GR ... AARCH64_MAX_GR: | |
219 | val = aarch64_get_reg_u64 (cpu, regno, 0); | |
220 | break; | |
221 | ||
222 | case AARCH64_MIN_FR ... AARCH64_MAX_FR: | |
223 | val = aarch64_get_FP_double (cpu, regno - 32); | |
224 | break; | |
225 | ||
226 | case AARCH64_PC_REGNO: | |
227 | val = aarch64_get_PC (cpu); | |
228 | break; | |
229 | ||
230 | case AARCH64_CPSR_REGNO: | |
231 | val = aarch64_get_CPSR (cpu); | |
232 | break; | |
233 | ||
234 | case AARCH64_FPSR_REGNO: | |
235 | val = aarch64_get_FPSR (cpu); | |
236 | break; | |
237 | ||
238 | default: | |
239 | sim_io_eprintf (CPU_STATE (cpu), | |
240 | "sim: unrecognized register number: %d\n", regno); | |
241 | return -1; | |
242 | } | |
243 | ||
244 | put_le (buf, length, val); | |
245 | ||
246 | return size; | |
247 | } | |
248 | ||
249 | static int | |
250 | aarch64_reg_set (SIM_CPU *cpu, int regno, unsigned char *buf, int length) | |
251 | { | |
252 | size_t size; | |
253 | bfd_vma val; | |
254 | ||
255 | if (!check_regno (regno)) | |
256 | return -1; | |
257 | ||
258 | size = reg_size (regno); | |
259 | ||
260 | if (length != size) | |
261 | return -1; | |
262 | ||
263 | val = get_le (buf, length); | |
264 | ||
265 | switch (regno) | |
266 | { | |
267 | case AARCH64_MIN_GR ... AARCH64_MAX_GR: | |
268 | aarch64_set_reg_u64 (cpu, regno, 1, val); | |
269 | break; | |
270 | ||
271 | case AARCH64_MIN_FR ... AARCH64_MAX_FR: | |
272 | aarch64_set_FP_double (cpu, regno - 32, (double) val); | |
273 | break; | |
274 | ||
275 | case AARCH64_PC_REGNO: | |
276 | aarch64_set_next_PC (cpu, val); | |
277 | aarch64_update_PC (cpu); | |
278 | break; | |
279 | ||
280 | case AARCH64_CPSR_REGNO: | |
281 | aarch64_set_CPSR (cpu, val); | |
282 | break; | |
283 | ||
284 | case AARCH64_FPSR_REGNO: | |
285 | aarch64_set_FPSR (cpu, val); | |
286 | break; | |
287 | ||
288 | default: | |
289 | sim_io_eprintf (CPU_STATE (cpu), | |
290 | "sim: unrecognized register number: %d\n", regno); | |
291 | return 0; | |
292 | } | |
293 | ||
294 | return size; | |
295 | } | |
296 | ||
297 | static sim_cia | |
298 | aarch64_pc_get (sim_cpu *cpu) | |
299 | { | |
300 | return aarch64_get_PC (cpu); | |
301 | } | |
302 | ||
303 | static void | |
304 | aarch64_pc_set (sim_cpu *cpu, sim_cia pc) | |
305 | { | |
306 | aarch64_set_next_PC (cpu, pc); | |
307 | aarch64_update_PC (cpu); | |
308 | } | |
309 | ||
310 | static void | |
311 | free_state (SIM_DESC sd) | |
312 | { | |
313 | if (STATE_MODULES (sd) != NULL) | |
314 | sim_module_uninstall (sd); | |
315 | sim_cpu_free_all (sd); | |
316 | sim_state_free (sd); | |
317 | } | |
318 | ||
2e8cf49e NC |
319 | SIM_DESC |
320 | sim_open (SIM_OPEN_KIND kind, | |
321 | struct host_callback_struct * callback, | |
322 | struct bfd * abfd, | |
2e3d4f4d | 323 | char * const * argv) |
2e8cf49e | 324 | { |
2e8cf49e NC |
325 | sim_cpu *cpu; |
326 | SIM_DESC sd = sim_state_alloc (kind, callback); | |
327 | ||
328 | if (sd == NULL) | |
329 | return sd; | |
330 | ||
331 | SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); | |
332 | ||
ba307cdd MF |
333 | /* We use NONSTRICT_ALIGNMENT as the default because AArch64 only enforces |
334 | 4-byte alignment, even for 8-byte reads/writes. The common core does not | |
335 | support this, so we opt for non-strict alignment instead. */ | |
336 | current_alignment = NONSTRICT_ALIGNMENT; | |
337 | ||
2e8cf49e | 338 | /* Perform the initialization steps one by one. */ |
d5a71b11 | 339 | if (sim_cpu_alloc_all (sd, 1) != SIM_RC_OK |
2e8cf49e NC |
340 | || sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK |
341 | || sim_parse_args (sd, argv) != SIM_RC_OK | |
342 | || sim_analyze_program (sd, | |
343 | (STATE_PROG_ARGV (sd) != NULL | |
344 | ? *STATE_PROG_ARGV (sd) | |
345 | : NULL), abfd) != SIM_RC_OK | |
346 | || sim_config (sd) != SIM_RC_OK | |
347 | || sim_post_argv_init (sd) != SIM_RC_OK) | |
348 | { | |
349 | free_state (sd); | |
350 | return NULL; | |
351 | } | |
352 | ||
353 | aarch64_init_LIT_table (); | |
354 | ||
355 | assert (MAX_NR_PROCESSORS == 1); | |
356 | cpu = STATE_CPU (sd, 0); | |
357 | CPU_PC_FETCH (cpu) = aarch64_pc_get; | |
358 | CPU_PC_STORE (cpu) = aarch64_pc_set; | |
359 | CPU_REG_FETCH (cpu) = aarch64_reg_get; | |
360 | CPU_REG_STORE (cpu) = aarch64_reg_set; | |
361 | ||
362 | /* Set SP, FP and PC to 0 and set LR to -1 | |
363 | so we can detect a top-level return. */ | |
364 | aarch64_set_reg_u64 (cpu, SP, 1, 0); | |
365 | aarch64_set_reg_u64 (cpu, FP, 1, 0); | |
366 | aarch64_set_reg_u64 (cpu, LR, 1, TOP_LEVEL_RETURN_PC); | |
367 | aarch64_set_next_PC (cpu, 0); | |
368 | aarch64_update_PC (cpu); | |
369 | ||
370 | /* Default to a 128 Mbyte (== 2^27) memory space. */ | |
371 | sim_do_commandf (sd, "memory-size 0x8000000"); | |
372 | ||
373 | return sd; | |
374 | } | |
375 | ||
376 | void | |
377 | sim_engine_run (SIM_DESC sd, | |
378 | int next_cpu_nr ATTRIBUTE_UNUSED, | |
379 | int nr_cpus ATTRIBUTE_UNUSED, | |
380 | int siggnal ATTRIBUTE_UNUSED) | |
381 | { | |
382 | aarch64_run (sd); | |
383 | } |