1 /* interp.c -- AArch64 sim interface to GDB.
3 Copyright (C) 2015-2016 Free Software Foundation, Inc.
5 Contributed by Red Hat.
7 This file is part of GDB.
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.
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.
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/>. */
32 #include "gdb/callback.h"
33 #include "gdb/remote-sim.h"
34 #include "gdb/signals.h"
35 #include "gdb/sim-aarch64.h"
38 #include "sim-options.h"
40 #include "simulator.h"
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. */
47 remove_useless_symbols (asymbol **symbols, long count)
49 asymbol **in_ptr = symbols;
50 asymbol **out_ptr = symbols;
54 asymbol *sym = *in_ptr++;
56 if (strstr (sym->name, "gcc2_compiled"))
58 if (sym->name == NULL || sym->name[0] == '\0')
60 if (sym->flags & (BSF_DEBUGGING))
62 if ( bfd_is_und_section (sym->section)
63 || bfd_is_com_section (sym->section))
65 if (sym->name[0] == '$')
70 return out_ptr - symbols;
74 compare_symbols (const void *ap, const void *bp)
76 const asymbol *a = * (const asymbol **) ap;
77 const asymbol *b = * (const asymbol **) bp;
79 if (bfd_asymbol_value (a) > bfd_asymbol_value (b))
81 if (bfd_asymbol_value (a) < bfd_asymbol_value (b))
86 /* Find the name of the function at ADDR. */
88 aarch64_get_func (SIM_DESC sd, uint64_t addr)
90 long symcount = STATE_PROG_SYMS_COUNT (sd);
91 asymbol **symtab = STATE_PROG_SYMS (sd);
101 sym = (min + max) / 2;
102 sa = bfd_asymbol_value (symtab[sym]);
116 return bfd_asymbol_name (symtab [min]);
122 sim_create_inferior (SIM_DESC sd, struct bfd *abfd,
123 char * const *argv, char * const *env)
125 sim_cpu *cpu = STATE_CPU (sd, 0);
129 addr = bfd_get_start_address (abfd);
131 aarch64_set_next_PC (cpu, addr);
132 aarch64_update_PC (cpu);
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)
140 freeargv (STATE_PROG_ARGV (sd));
141 STATE_PROG_ARGV (sd) = dupargv (argv);
144 if (trace_load_symbols (sd))
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);
153 aarch64_init (cpu, addr);
158 /* Read the LENGTH bytes at BUF as a little-endian value. */
161 get_le (unsigned char *buf, unsigned int length)
165 while (length -- > 0)
166 acc = (acc << 8) + buf[length];
171 /* Store VAL as a little-endian value in the LENGTH bytes at BUF. */
174 put_le (unsigned char *buf, unsigned int length, bfd_vma val)
178 for (i = 0; i < length; i++)
186 check_regno (int regno)
188 return 0 <= regno && regno < AARCH64_MAX_REGNO;
194 if (regno == AARCH64_CPSR_REGNO || regno == AARCH64_FPSR_REGNO)
200 aarch64_reg_get (SIM_CPU *cpu, int regno, unsigned char *buf, int length)
205 if (!check_regno (regno))
208 size = reg_size (regno);
215 case AARCH64_MIN_GR ... AARCH64_MAX_GR:
216 val = aarch64_get_reg_u64 (cpu, regno, 0);
219 case AARCH64_MIN_FR ... AARCH64_MAX_FR:
220 val = aarch64_get_FP_double (cpu, regno - 32);
223 case AARCH64_PC_REGNO:
224 val = aarch64_get_PC (cpu);
227 case AARCH64_CPSR_REGNO:
228 val = aarch64_get_CPSR (cpu);
231 case AARCH64_FPSR_REGNO:
232 val = aarch64_get_FPSR (cpu);
236 sim_io_eprintf (CPU_STATE (cpu),
237 "sim: unrecognized register number: %d\n", regno);
241 put_le (buf, length, val);
247 aarch64_reg_set (SIM_CPU *cpu, int regno, unsigned char *buf, int length)
252 if (!check_regno (regno))
255 size = reg_size (regno);
260 val = get_le (buf, length);
264 case AARCH64_MIN_GR ... AARCH64_MAX_GR:
265 aarch64_set_reg_u64 (cpu, regno, 1, val);
268 case AARCH64_MIN_FR ... AARCH64_MAX_FR:
269 aarch64_set_FP_double (cpu, regno - 32, (double) val);
272 case AARCH64_PC_REGNO:
273 aarch64_set_next_PC (cpu, val);
274 aarch64_update_PC (cpu);
277 case AARCH64_CPSR_REGNO:
278 aarch64_set_CPSR (cpu, val);
281 case AARCH64_FPSR_REGNO:
282 aarch64_set_FPSR (cpu, val);
286 sim_io_eprintf (CPU_STATE (cpu),
287 "sim: unrecognized register number: %d\n", regno);
295 aarch64_pc_get (sim_cpu *cpu)
297 return aarch64_get_PC (cpu);
301 aarch64_pc_set (sim_cpu *cpu, sim_cia pc)
303 aarch64_set_next_PC (cpu, pc);
304 aarch64_update_PC (cpu);
308 free_state (SIM_DESC sd)
310 if (STATE_MODULES (sd) != NULL)
311 sim_module_uninstall (sd);
312 sim_cpu_free_all (sd);
317 sim_open (SIM_OPEN_KIND kind,
318 struct host_callback_struct * callback,
323 SIM_DESC sd = sim_state_alloc (kind, callback);
328 SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
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)
345 aarch64_init_LIT_table ();
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;
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);
362 /* Default to a 128 Mbyte (== 2^27) memory space. */
363 sim_do_commandf (sd, "memory-size 0x8000000");
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)