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2e8cf49e NC |
1 | /* interp.c -- AArch64 sim interface to GDB. |
2 | ||
b811d2c2 | 3 | Copyright (C) 2015-2020 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 | ||
22 | #include "config.h" | |
23 | #include <stdio.h> | |
24 | #include <assert.h> | |
25 | #include <signal.h> | |
26 | #include <string.h> | |
27 | #include <ctype.h> | |
28 | #include <stdlib.h> | |
29 | ||
30 | #include "ansidecl.h" | |
5357150c | 31 | #include "bfd.h" |
2e8cf49e NC |
32 | #include "gdb/callback.h" |
33 | #include "gdb/remote-sim.h" | |
34 | #include "gdb/signals.h" | |
35 | #include "gdb/sim-aarch64.h" | |
36 | ||
37 | #include "sim-main.h" | |
38 | #include "sim-options.h" | |
39 | #include "memory.h" | |
40 | #include "simulator.h" | |
cd5b6074 | 41 | #include "sim-assert.h" |
2e8cf49e | 42 | |
2e8cf49e NC |
43 | /* Filter out (in place) symbols that are useless for disassembly. |
44 | COUNT is the number of elements in SYMBOLS. | |
45 | Return the number of useful symbols. */ | |
46 | ||
5357150c MF |
47 | static long |
48 | remove_useless_symbols (asymbol **symbols, long count) | |
2e8cf49e NC |
49 | { |
50 | asymbol **in_ptr = symbols; | |
51 | asymbol **out_ptr = symbols; | |
52 | ||
53 | while (count-- > 0) | |
54 | { | |
55 | asymbol *sym = *in_ptr++; | |
56 | ||
57 | if (strstr (sym->name, "gcc2_compiled")) | |
58 | continue; | |
59 | if (sym->name == NULL || sym->name[0] == '\0') | |
60 | continue; | |
61 | if (sym->flags & (BSF_DEBUGGING)) | |
62 | continue; | |
63 | if ( bfd_is_und_section (sym->section) | |
64 | || bfd_is_com_section (sym->section)) | |
65 | continue; | |
66 | if (sym->name[0] == '$') | |
67 | continue; | |
68 | ||
69 | *out_ptr++ = sym; | |
70 | } | |
71 | return out_ptr - symbols; | |
72 | } | |
73 | ||
74 | static signed int | |
75 | compare_symbols (const void *ap, const void *bp) | |
76 | { | |
77 | const asymbol *a = * (const asymbol **) ap; | |
78 | const asymbol *b = * (const asymbol **) bp; | |
79 | ||
80 | if (bfd_asymbol_value (a) > bfd_asymbol_value (b)) | |
81 | return 1; | |
82 | if (bfd_asymbol_value (a) < bfd_asymbol_value (b)) | |
83 | return -1; | |
84 | return 0; | |
85 | } | |
86 | ||
87 | /* Find the name of the function at ADDR. */ | |
88 | const char * | |
5357150c | 89 | aarch64_get_func (SIM_DESC sd, uint64_t addr) |
2e8cf49e | 90 | { |
5357150c MF |
91 | long symcount = STATE_PROG_SYMS_COUNT (sd); |
92 | asymbol **symtab = STATE_PROG_SYMS (sd); | |
2e8cf49e NC |
93 | int min, max; |
94 | ||
95 | min = -1; | |
96 | max = symcount; | |
97 | while (min < max - 1) | |
98 | { | |
99 | int sym; | |
100 | bfd_vma sa; | |
101 | ||
102 | sym = (min + max) / 2; | |
103 | sa = bfd_asymbol_value (symtab[sym]); | |
104 | ||
105 | if (sa > addr) | |
106 | max = sym; | |
107 | else if (sa < addr) | |
108 | min = sym; | |
109 | else | |
110 | { | |
111 | min = sym; | |
112 | break; | |
113 | } | |
114 | } | |
115 | ||
116 | if (min != -1) | |
117 | return bfd_asymbol_name (symtab [min]); | |
118 | ||
119 | return ""; | |
120 | } | |
121 | ||
2e8cf49e | 122 | SIM_RC |
2e3d4f4d MF |
123 | sim_create_inferior (SIM_DESC sd, struct bfd *abfd, |
124 | char * const *argv, char * const *env) | |
2e8cf49e NC |
125 | { |
126 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
2e8cf49e NC |
127 | bfd_vma addr = 0; |
128 | ||
129 | if (abfd != NULL) | |
130 | addr = bfd_get_start_address (abfd); | |
131 | ||
132 | aarch64_set_next_PC (cpu, addr); | |
133 | aarch64_update_PC (cpu); | |
134 | ||
0e967299 MF |
135 | /* Standalone mode (i.e. `run`) will take care of the argv for us in |
136 | sim_open() -> sim_parse_args(). But in debug mode (i.e. 'target sim' | |
137 | with `gdb`), we need to handle it because the user can change the | |
138 | argv on the fly via gdb's 'run'. */ | |
139 | if (STATE_PROG_ARGV (sd) != argv) | |
2e8cf49e NC |
140 | { |
141 | freeargv (STATE_PROG_ARGV (sd)); | |
142 | STATE_PROG_ARGV (sd) = dupargv (argv); | |
143 | } | |
144 | ||
5357150c | 145 | if (trace_load_symbols (sd)) |
2e8cf49e | 146 | { |
5357150c MF |
147 | STATE_PROG_SYMS_COUNT (sd) = |
148 | remove_useless_symbols (STATE_PROG_SYMS (sd), | |
149 | STATE_PROG_SYMS_COUNT (sd)); | |
150 | qsort (STATE_PROG_SYMS (sd), STATE_PROG_SYMS_COUNT (sd), | |
151 | sizeof (asymbol *), compare_symbols); | |
2e8cf49e NC |
152 | } |
153 | ||
6a277579 | 154 | aarch64_init (cpu, addr); |
2e8cf49e NC |
155 | |
156 | return SIM_RC_OK; | |
157 | } | |
158 | ||
159 | /* Read the LENGTH bytes at BUF as a little-endian value. */ | |
160 | ||
161 | static bfd_vma | |
162 | get_le (unsigned char *buf, unsigned int length) | |
163 | { | |
164 | bfd_vma acc = 0; | |
165 | ||
166 | while (length -- > 0) | |
167 | acc = (acc << 8) + buf[length]; | |
168 | ||
169 | return acc; | |
170 | } | |
171 | ||
172 | /* Store VAL as a little-endian value in the LENGTH bytes at BUF. */ | |
173 | ||
174 | static void | |
175 | put_le (unsigned char *buf, unsigned int length, bfd_vma val) | |
176 | { | |
177 | int i; | |
178 | ||
179 | for (i = 0; i < length; i++) | |
180 | { | |
181 | buf[i] = val & 0xff; | |
182 | val >>= 8; | |
183 | } | |
184 | } | |
185 | ||
186 | static int | |
187 | check_regno (int regno) | |
188 | { | |
189 | return 0 <= regno && regno < AARCH64_MAX_REGNO; | |
190 | } | |
191 | ||
192 | static size_t | |
193 | reg_size (int regno) | |
194 | { | |
195 | if (regno == AARCH64_CPSR_REGNO || regno == AARCH64_FPSR_REGNO) | |
196 | return 32; | |
197 | return 64; | |
198 | } | |
199 | ||
200 | static int | |
201 | aarch64_reg_get (SIM_CPU *cpu, int regno, unsigned char *buf, int length) | |
202 | { | |
203 | size_t size; | |
204 | bfd_vma val; | |
205 | ||
206 | if (!check_regno (regno)) | |
207 | return 0; | |
208 | ||
209 | size = reg_size (regno); | |
210 | ||
211 | if (length != size) | |
212 | return 0; | |
213 | ||
214 | switch (regno) | |
215 | { | |
216 | case AARCH64_MIN_GR ... AARCH64_MAX_GR: | |
217 | val = aarch64_get_reg_u64 (cpu, regno, 0); | |
218 | break; | |
219 | ||
220 | case AARCH64_MIN_FR ... AARCH64_MAX_FR: | |
221 | val = aarch64_get_FP_double (cpu, regno - 32); | |
222 | break; | |
223 | ||
224 | case AARCH64_PC_REGNO: | |
225 | val = aarch64_get_PC (cpu); | |
226 | break; | |
227 | ||
228 | case AARCH64_CPSR_REGNO: | |
229 | val = aarch64_get_CPSR (cpu); | |
230 | break; | |
231 | ||
232 | case AARCH64_FPSR_REGNO: | |
233 | val = aarch64_get_FPSR (cpu); | |
234 | break; | |
235 | ||
236 | default: | |
237 | sim_io_eprintf (CPU_STATE (cpu), | |
238 | "sim: unrecognized register number: %d\n", regno); | |
239 | return -1; | |
240 | } | |
241 | ||
242 | put_le (buf, length, val); | |
243 | ||
244 | return size; | |
245 | } | |
246 | ||
247 | static int | |
248 | aarch64_reg_set (SIM_CPU *cpu, int regno, unsigned char *buf, int length) | |
249 | { | |
250 | size_t size; | |
251 | bfd_vma val; | |
252 | ||
253 | if (!check_regno (regno)) | |
254 | return -1; | |
255 | ||
256 | size = reg_size (regno); | |
257 | ||
258 | if (length != size) | |
259 | return -1; | |
260 | ||
261 | val = get_le (buf, length); | |
262 | ||
263 | switch (regno) | |
264 | { | |
265 | case AARCH64_MIN_GR ... AARCH64_MAX_GR: | |
266 | aarch64_set_reg_u64 (cpu, regno, 1, val); | |
267 | break; | |
268 | ||
269 | case AARCH64_MIN_FR ... AARCH64_MAX_FR: | |
270 | aarch64_set_FP_double (cpu, regno - 32, (double) val); | |
271 | break; | |
272 | ||
273 | case AARCH64_PC_REGNO: | |
274 | aarch64_set_next_PC (cpu, val); | |
275 | aarch64_update_PC (cpu); | |
276 | break; | |
277 | ||
278 | case AARCH64_CPSR_REGNO: | |
279 | aarch64_set_CPSR (cpu, val); | |
280 | break; | |
281 | ||
282 | case AARCH64_FPSR_REGNO: | |
283 | aarch64_set_FPSR (cpu, val); | |
284 | break; | |
285 | ||
286 | default: | |
287 | sim_io_eprintf (CPU_STATE (cpu), | |
288 | "sim: unrecognized register number: %d\n", regno); | |
289 | return 0; | |
290 | } | |
291 | ||
292 | return size; | |
293 | } | |
294 | ||
295 | static sim_cia | |
296 | aarch64_pc_get (sim_cpu *cpu) | |
297 | { | |
298 | return aarch64_get_PC (cpu); | |
299 | } | |
300 | ||
301 | static void | |
302 | aarch64_pc_set (sim_cpu *cpu, sim_cia pc) | |
303 | { | |
304 | aarch64_set_next_PC (cpu, pc); | |
305 | aarch64_update_PC (cpu); | |
306 | } | |
307 | ||
308 | static void | |
309 | free_state (SIM_DESC sd) | |
310 | { | |
311 | if (STATE_MODULES (sd) != NULL) | |
312 | sim_module_uninstall (sd); | |
313 | sim_cpu_free_all (sd); | |
314 | sim_state_free (sd); | |
315 | } | |
316 | ||
2e8cf49e NC |
317 | SIM_DESC |
318 | sim_open (SIM_OPEN_KIND kind, | |
319 | struct host_callback_struct * callback, | |
320 | struct bfd * abfd, | |
2e3d4f4d | 321 | char * const * argv) |
2e8cf49e | 322 | { |
2e8cf49e NC |
323 | sim_cpu *cpu; |
324 | SIM_DESC sd = sim_state_alloc (kind, callback); | |
325 | ||
326 | if (sd == NULL) | |
327 | return sd; | |
328 | ||
329 | SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); | |
330 | ||
2e8cf49e NC |
331 | /* Perform the initialization steps one by one. */ |
332 | if (sim_cpu_alloc_all (sd, 1, 0) != SIM_RC_OK | |
333 | || sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK | |
334 | || sim_parse_args (sd, argv) != SIM_RC_OK | |
335 | || sim_analyze_program (sd, | |
336 | (STATE_PROG_ARGV (sd) != NULL | |
337 | ? *STATE_PROG_ARGV (sd) | |
338 | : NULL), abfd) != SIM_RC_OK | |
339 | || sim_config (sd) != SIM_RC_OK | |
340 | || sim_post_argv_init (sd) != SIM_RC_OK) | |
341 | { | |
342 | free_state (sd); | |
343 | return NULL; | |
344 | } | |
345 | ||
346 | aarch64_init_LIT_table (); | |
347 | ||
348 | assert (MAX_NR_PROCESSORS == 1); | |
349 | cpu = STATE_CPU (sd, 0); | |
350 | CPU_PC_FETCH (cpu) = aarch64_pc_get; | |
351 | CPU_PC_STORE (cpu) = aarch64_pc_set; | |
352 | CPU_REG_FETCH (cpu) = aarch64_reg_get; | |
353 | CPU_REG_STORE (cpu) = aarch64_reg_set; | |
354 | ||
355 | /* Set SP, FP and PC to 0 and set LR to -1 | |
356 | so we can detect a top-level return. */ | |
357 | aarch64_set_reg_u64 (cpu, SP, 1, 0); | |
358 | aarch64_set_reg_u64 (cpu, FP, 1, 0); | |
359 | aarch64_set_reg_u64 (cpu, LR, 1, TOP_LEVEL_RETURN_PC); | |
360 | aarch64_set_next_PC (cpu, 0); | |
361 | aarch64_update_PC (cpu); | |
362 | ||
363 | /* Default to a 128 Mbyte (== 2^27) memory space. */ | |
364 | sim_do_commandf (sd, "memory-size 0x8000000"); | |
365 | ||
366 | return sd; | |
367 | } | |
368 | ||
369 | void | |
370 | sim_engine_run (SIM_DESC sd, | |
371 | int next_cpu_nr ATTRIBUTE_UNUSED, | |
372 | int nr_cpus ATTRIBUTE_UNUSED, | |
373 | int siggnal ATTRIBUTE_UNUSED) | |
374 | { | |
375 | aarch64_run (sd); | |
376 | } |