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2e8cf49e NC |
1 | /* interp.c -- AArch64 sim interface to GDB. |
2 | ||
618f726f | 3 | Copyright (C) 2015-2016 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" | |
31 | #include "gdb/callback.h" | |
32 | #include "gdb/remote-sim.h" | |
33 | #include "gdb/signals.h" | |
34 | #include "gdb/sim-aarch64.h" | |
35 | ||
36 | #include "sim-main.h" | |
37 | #include "sim-options.h" | |
38 | #include "memory.h" | |
39 | #include "simulator.h" | |
40 | ||
41 | #include "dis-asm.h" | |
42 | ||
43 | static struct disassemble_info info; | |
44 | static unsigned long symcount = 0; | |
45 | static asymbol ** symtab = NULL; | |
46 | ||
47 | /* FIXME: 1000 characters should be enough to hold the disassembled | |
48 | instruction plus any comments that come after it. But maybe with | |
49 | C++ programs this might not be enough. Not sure if it is worth | |
50 | adding logic to dynamically grow the buffer though. */ | |
51 | static char opbuf[1000]; | |
52 | ||
53 | static int op_printf (void *, const char *, ...) ATTRIBUTE_FPTR_PRINTF_2; | |
54 | ||
55 | static int | |
56 | op_printf (void *stream ATTRIBUTE_UNUSED, const char *fmt, ...) | |
57 | { | |
58 | size_t space_remaining; | |
59 | int ret; | |
60 | va_list ap; | |
61 | ||
62 | space_remaining = sizeof (opbuf) - strlen (opbuf); | |
63 | va_start (ap, fmt); | |
64 | /* Instead of printing to stream we store the text in opbuf. | |
65 | This allows us to use the sim_io_eprintf routine to output | |
66 | the text in aarch64_print_insn. */ | |
67 | ret = vsnprintf (opbuf + strlen (opbuf), space_remaining, fmt, ap); | |
68 | va_end (ap); | |
69 | return ret; | |
70 | } | |
71 | ||
72 | void | |
73 | aarch64_print_insn (SIM_DESC sd, uint64_t addr) | |
74 | { | |
75 | int size; | |
76 | ||
77 | opbuf[0] = 0; | |
78 | size = print_insn_aarch64 (addr, & info); | |
79 | sim_io_eprintf (sd, " %*s\n", size, opbuf); | |
80 | } | |
81 | ||
82 | static int | |
83 | sim_dis_read (bfd_vma memaddr, | |
84 | bfd_byte * ptr, | |
85 | unsigned int length, | |
86 | struct disassemble_info * info) | |
87 | { | |
5d015275 | 88 | aarch64_get_mem_blk (info->application_data, memaddr, (char *) ptr, length); |
2e8cf49e NC |
89 | |
90 | return 0; | |
91 | } | |
92 | ||
93 | /* Filter out (in place) symbols that are useless for disassembly. | |
94 | COUNT is the number of elements in SYMBOLS. | |
95 | Return the number of useful symbols. */ | |
96 | ||
97 | static unsigned long | |
98 | remove_useless_symbols (asymbol **symbols, unsigned long count) | |
99 | { | |
100 | asymbol **in_ptr = symbols; | |
101 | asymbol **out_ptr = symbols; | |
102 | ||
103 | while (count-- > 0) | |
104 | { | |
105 | asymbol *sym = *in_ptr++; | |
106 | ||
107 | if (strstr (sym->name, "gcc2_compiled")) | |
108 | continue; | |
109 | if (sym->name == NULL || sym->name[0] == '\0') | |
110 | continue; | |
111 | if (sym->flags & (BSF_DEBUGGING)) | |
112 | continue; | |
113 | if ( bfd_is_und_section (sym->section) | |
114 | || bfd_is_com_section (sym->section)) | |
115 | continue; | |
116 | if (sym->name[0] == '$') | |
117 | continue; | |
118 | ||
119 | *out_ptr++ = sym; | |
120 | } | |
121 | return out_ptr - symbols; | |
122 | } | |
123 | ||
124 | static signed int | |
125 | compare_symbols (const void *ap, const void *bp) | |
126 | { | |
127 | const asymbol *a = * (const asymbol **) ap; | |
128 | const asymbol *b = * (const asymbol **) bp; | |
129 | ||
130 | if (bfd_asymbol_value (a) > bfd_asymbol_value (b)) | |
131 | return 1; | |
132 | if (bfd_asymbol_value (a) < bfd_asymbol_value (b)) | |
133 | return -1; | |
134 | return 0; | |
135 | } | |
136 | ||
137 | /* Find the name of the function at ADDR. */ | |
138 | const char * | |
139 | aarch64_get_func (uint64_t addr) | |
140 | { | |
141 | int min, max; | |
142 | ||
143 | min = -1; | |
144 | max = symcount; | |
145 | while (min < max - 1) | |
146 | { | |
147 | int sym; | |
148 | bfd_vma sa; | |
149 | ||
150 | sym = (min + max) / 2; | |
151 | sa = bfd_asymbol_value (symtab[sym]); | |
152 | ||
153 | if (sa > addr) | |
154 | max = sym; | |
155 | else if (sa < addr) | |
156 | min = sym; | |
157 | else | |
158 | { | |
159 | min = sym; | |
160 | break; | |
161 | } | |
162 | } | |
163 | ||
164 | if (min != -1) | |
165 | return bfd_asymbol_name (symtab [min]); | |
166 | ||
167 | return ""; | |
168 | } | |
169 | ||
170 | uint64_t | |
171 | aarch64_get_sym_value (const char *name) | |
172 | { | |
173 | unsigned long i; | |
174 | ||
175 | for (i = 0; i < symcount; i++) | |
176 | if (strcmp (bfd_asymbol_name (symtab[i]), name) == 0) | |
177 | return bfd_asymbol_value (symtab[i]); | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | SIM_RC | |
183 | sim_create_inferior (SIM_DESC sd, struct bfd *abfd, char **argv, char **env) | |
184 | { | |
185 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
186 | long storage; | |
187 | bfd_vma addr = 0; | |
188 | ||
189 | if (abfd != NULL) | |
190 | addr = bfd_get_start_address (abfd); | |
191 | ||
192 | aarch64_set_next_PC (cpu, addr); | |
193 | aarch64_update_PC (cpu); | |
194 | ||
0e967299 MF |
195 | /* Standalone mode (i.e. `run`) will take care of the argv for us in |
196 | sim_open() -> sim_parse_args(). But in debug mode (i.e. 'target sim' | |
197 | with `gdb`), we need to handle it because the user can change the | |
198 | argv on the fly via gdb's 'run'. */ | |
199 | if (STATE_PROG_ARGV (sd) != argv) | |
2e8cf49e NC |
200 | { |
201 | freeargv (STATE_PROG_ARGV (sd)); | |
202 | STATE_PROG_ARGV (sd) = dupargv (argv); | |
203 | } | |
204 | ||
205 | memset (& info, 0, sizeof (info)); | |
206 | init_disassemble_info (& info, NULL, op_printf); | |
207 | info.read_memory_func = sim_dis_read; | |
208 | info.arch = bfd_get_arch (abfd); | |
209 | info.mach = bfd_get_mach (abfd); | |
5d015275 | 210 | info.application_data = cpu; |
2e8cf49e NC |
211 | if (info.mach == 0) |
212 | info.arch = bfd_arch_aarch64; | |
213 | disassemble_init_for_target (& info); | |
214 | ||
215 | storage = bfd_get_symtab_upper_bound (abfd); | |
216 | if (storage > 0) | |
217 | { | |
218 | symtab = (asymbol **) xmalloc (storage); | |
219 | symcount = bfd_canonicalize_symtab (abfd, symtab); | |
220 | symcount = remove_useless_symbols (symtab, symcount); | |
221 | qsort (symtab, symcount, sizeof (asymbol *), compare_symbols); | |
222 | } | |
223 | ||
224 | aarch64_init (cpu, bfd_get_start_address (abfd)); | |
225 | ||
226 | return SIM_RC_OK; | |
227 | } | |
228 | ||
229 | /* Read the LENGTH bytes at BUF as a little-endian value. */ | |
230 | ||
231 | static bfd_vma | |
232 | get_le (unsigned char *buf, unsigned int length) | |
233 | { | |
234 | bfd_vma acc = 0; | |
235 | ||
236 | while (length -- > 0) | |
237 | acc = (acc << 8) + buf[length]; | |
238 | ||
239 | return acc; | |
240 | } | |
241 | ||
242 | /* Store VAL as a little-endian value in the LENGTH bytes at BUF. */ | |
243 | ||
244 | static void | |
245 | put_le (unsigned char *buf, unsigned int length, bfd_vma val) | |
246 | { | |
247 | int i; | |
248 | ||
249 | for (i = 0; i < length; i++) | |
250 | { | |
251 | buf[i] = val & 0xff; | |
252 | val >>= 8; | |
253 | } | |
254 | } | |
255 | ||
256 | static int | |
257 | check_regno (int regno) | |
258 | { | |
259 | return 0 <= regno && regno < AARCH64_MAX_REGNO; | |
260 | } | |
261 | ||
262 | static size_t | |
263 | reg_size (int regno) | |
264 | { | |
265 | if (regno == AARCH64_CPSR_REGNO || regno == AARCH64_FPSR_REGNO) | |
266 | return 32; | |
267 | return 64; | |
268 | } | |
269 | ||
270 | static int | |
271 | aarch64_reg_get (SIM_CPU *cpu, int regno, unsigned char *buf, int length) | |
272 | { | |
273 | size_t size; | |
274 | bfd_vma val; | |
275 | ||
276 | if (!check_regno (regno)) | |
277 | return 0; | |
278 | ||
279 | size = reg_size (regno); | |
280 | ||
281 | if (length != size) | |
282 | return 0; | |
283 | ||
284 | switch (regno) | |
285 | { | |
286 | case AARCH64_MIN_GR ... AARCH64_MAX_GR: | |
287 | val = aarch64_get_reg_u64 (cpu, regno, 0); | |
288 | break; | |
289 | ||
290 | case AARCH64_MIN_FR ... AARCH64_MAX_FR: | |
291 | val = aarch64_get_FP_double (cpu, regno - 32); | |
292 | break; | |
293 | ||
294 | case AARCH64_PC_REGNO: | |
295 | val = aarch64_get_PC (cpu); | |
296 | break; | |
297 | ||
298 | case AARCH64_CPSR_REGNO: | |
299 | val = aarch64_get_CPSR (cpu); | |
300 | break; | |
301 | ||
302 | case AARCH64_FPSR_REGNO: | |
303 | val = aarch64_get_FPSR (cpu); | |
304 | break; | |
305 | ||
306 | default: | |
307 | sim_io_eprintf (CPU_STATE (cpu), | |
308 | "sim: unrecognized register number: %d\n", regno); | |
309 | return -1; | |
310 | } | |
311 | ||
312 | put_le (buf, length, val); | |
313 | ||
314 | return size; | |
315 | } | |
316 | ||
317 | static int | |
318 | aarch64_reg_set (SIM_CPU *cpu, int regno, unsigned char *buf, int length) | |
319 | { | |
320 | size_t size; | |
321 | bfd_vma val; | |
322 | ||
323 | if (!check_regno (regno)) | |
324 | return -1; | |
325 | ||
326 | size = reg_size (regno); | |
327 | ||
328 | if (length != size) | |
329 | return -1; | |
330 | ||
331 | val = get_le (buf, length); | |
332 | ||
333 | switch (regno) | |
334 | { | |
335 | case AARCH64_MIN_GR ... AARCH64_MAX_GR: | |
336 | aarch64_set_reg_u64 (cpu, regno, 1, val); | |
337 | break; | |
338 | ||
339 | case AARCH64_MIN_FR ... AARCH64_MAX_FR: | |
340 | aarch64_set_FP_double (cpu, regno - 32, (double) val); | |
341 | break; | |
342 | ||
343 | case AARCH64_PC_REGNO: | |
344 | aarch64_set_next_PC (cpu, val); | |
345 | aarch64_update_PC (cpu); | |
346 | break; | |
347 | ||
348 | case AARCH64_CPSR_REGNO: | |
349 | aarch64_set_CPSR (cpu, val); | |
350 | break; | |
351 | ||
352 | case AARCH64_FPSR_REGNO: | |
353 | aarch64_set_FPSR (cpu, val); | |
354 | break; | |
355 | ||
356 | default: | |
357 | sim_io_eprintf (CPU_STATE (cpu), | |
358 | "sim: unrecognized register number: %d\n", regno); | |
359 | return 0; | |
360 | } | |
361 | ||
362 | return size; | |
363 | } | |
364 | ||
365 | static sim_cia | |
366 | aarch64_pc_get (sim_cpu *cpu) | |
367 | { | |
368 | return aarch64_get_PC (cpu); | |
369 | } | |
370 | ||
371 | static void | |
372 | aarch64_pc_set (sim_cpu *cpu, sim_cia pc) | |
373 | { | |
374 | aarch64_set_next_PC (cpu, pc); | |
375 | aarch64_update_PC (cpu); | |
376 | } | |
377 | ||
378 | static void | |
379 | free_state (SIM_DESC sd) | |
380 | { | |
381 | if (STATE_MODULES (sd) != NULL) | |
382 | sim_module_uninstall (sd); | |
383 | sim_cpu_free_all (sd); | |
384 | sim_state_free (sd); | |
385 | } | |
386 | ||
387 | enum | |
388 | { | |
389 | OPTION_DISAS = OPTION_START, | |
390 | }; | |
391 | ||
392 | static SIM_RC | |
393 | aarch64_option_handler (SIM_DESC sd ATTRIBUTE_UNUSED, | |
394 | sim_cpu * current_cpu ATTRIBUTE_UNUSED, | |
395 | int opt, | |
396 | char * arg ATTRIBUTE_UNUSED, | |
397 | int is_command ATTRIBUTE_UNUSED) | |
398 | { | |
399 | switch (opt) | |
400 | { | |
401 | case OPTION_DISAS: | |
402 | disas = TRUE; | |
403 | return SIM_RC_OK; | |
404 | ||
405 | default: | |
406 | sim_io_eprintf (sd, "Unknown AArch64 option %d\n", opt); | |
407 | return SIM_RC_FAIL; | |
408 | } | |
409 | } | |
410 | ||
411 | static DECLARE_OPTION_HANDLER (aarch64_option_handler); | |
412 | ||
413 | const OPTION aarch64_options[] = | |
414 | { | |
415 | { {"disas", no_argument, NULL, OPTION_DISAS }, | |
416 | '\0', NULL, "Enable instruction disassembly", | |
417 | aarch64_option_handler, NULL }, | |
418 | ||
419 | { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL, NULL } | |
420 | }; | |
421 | ||
422 | SIM_DESC | |
423 | sim_open (SIM_OPEN_KIND kind, | |
424 | struct host_callback_struct * callback, | |
425 | struct bfd * abfd, | |
426 | char ** argv) | |
427 | { | |
428 | int i; | |
429 | sim_cpu *cpu; | |
430 | SIM_DESC sd = sim_state_alloc (kind, callback); | |
431 | ||
432 | if (sd == NULL) | |
433 | return sd; | |
434 | ||
435 | SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); | |
436 | ||
437 | sim_add_option_table (sd, NULL, aarch64_options); | |
438 | ||
439 | /* Perform the initialization steps one by one. */ | |
440 | if (sim_cpu_alloc_all (sd, 1, 0) != SIM_RC_OK | |
441 | || sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK | |
442 | || sim_parse_args (sd, argv) != SIM_RC_OK | |
443 | || sim_analyze_program (sd, | |
444 | (STATE_PROG_ARGV (sd) != NULL | |
445 | ? *STATE_PROG_ARGV (sd) | |
446 | : NULL), abfd) != SIM_RC_OK | |
447 | || sim_config (sd) != SIM_RC_OK | |
448 | || sim_post_argv_init (sd) != SIM_RC_OK) | |
449 | { | |
450 | free_state (sd); | |
451 | return NULL; | |
452 | } | |
453 | ||
454 | aarch64_init_LIT_table (); | |
455 | ||
456 | assert (MAX_NR_PROCESSORS == 1); | |
457 | cpu = STATE_CPU (sd, 0); | |
458 | CPU_PC_FETCH (cpu) = aarch64_pc_get; | |
459 | CPU_PC_STORE (cpu) = aarch64_pc_set; | |
460 | CPU_REG_FETCH (cpu) = aarch64_reg_get; | |
461 | CPU_REG_STORE (cpu) = aarch64_reg_set; | |
462 | ||
463 | /* Set SP, FP and PC to 0 and set LR to -1 | |
464 | so we can detect a top-level return. */ | |
465 | aarch64_set_reg_u64 (cpu, SP, 1, 0); | |
466 | aarch64_set_reg_u64 (cpu, FP, 1, 0); | |
467 | aarch64_set_reg_u64 (cpu, LR, 1, TOP_LEVEL_RETURN_PC); | |
468 | aarch64_set_next_PC (cpu, 0); | |
469 | aarch64_update_PC (cpu); | |
470 | ||
471 | /* Default to a 128 Mbyte (== 2^27) memory space. */ | |
472 | sim_do_commandf (sd, "memory-size 0x8000000"); | |
473 | ||
474 | return sd; | |
475 | } | |
476 | ||
477 | void | |
478 | sim_engine_run (SIM_DESC sd, | |
479 | int next_cpu_nr ATTRIBUTE_UNUSED, | |
480 | int nr_cpus ATTRIBUTE_UNUSED, | |
481 | int siggnal ATTRIBUTE_UNUSED) | |
482 | { | |
483 | aarch64_run (sd); | |
484 | } |