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