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1 | /* Example synacor simulator. |
2 | ||
3 | Copyright (C) 2005-2021 Free Software Foundation, Inc. | |
4 | Contributed by Mike Frysinger. | |
5 | ||
6 | This file is part of simulators. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | /* This file contains the main glue logic between the sim core and the target | |
22 | specific simulator. Normally this file will be kept small and the target | |
23 | details will live in other files. | |
24 | ||
df68e12b MF |
25 | For more specific details on these functions, see the sim/sim.h header |
26 | file. */ | |
26da232c | 27 | |
6df01ab8 MF |
28 | /* This must come before any other includes. */ |
29 | #include "defs.h" | |
26da232c MF |
30 | |
31 | #include "sim-main.h" | |
32 | #include "sim-options.h" | |
33 | \f | |
34 | /* This function is the main loop. It should process ticks and decode+execute | |
35 | a single instruction. | |
36 | ||
37 | Usually you do not need to change things here. */ | |
38 | ||
39 | void | |
40 | sim_engine_run (SIM_DESC sd, | |
41 | int next_cpu_nr, /* ignore */ | |
42 | int nr_cpus, /* ignore */ | |
43 | int siggnal) /* ignore */ | |
44 | { | |
45 | SIM_CPU *cpu; | |
46 | ||
47 | SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); | |
48 | ||
49 | cpu = STATE_CPU (sd, 0); | |
50 | ||
51 | while (1) | |
52 | { | |
53 | step_once (cpu); | |
54 | if (sim_events_tick (sd)) | |
55 | sim_events_process (sd); | |
56 | } | |
57 | } | |
58 | \f | |
59 | /* Initialize the simulator from scratch. This is called once per lifetime of | |
60 | the simulation. Think of it as a processor reset. | |
61 | ||
62 | Usually all cpu-specific setup is handled in the initialize_cpu callback. | |
63 | If you want to do cpu-independent stuff, then it should go at the end (see | |
64 | where memory is initialized). */ | |
65 | ||
66 | #define DEFAULT_MEM_SIZE (16 * 1024 * 1024) | |
67 | ||
68 | static void | |
69 | free_state (SIM_DESC sd) | |
70 | { | |
71 | if (STATE_MODULES (sd) != NULL) | |
72 | sim_module_uninstall (sd); | |
73 | sim_cpu_free_all (sd); | |
74 | sim_state_free (sd); | |
75 | } | |
76 | ||
77 | SIM_DESC | |
78 | sim_open (SIM_OPEN_KIND kind, host_callback *callback, | |
79 | struct bfd *abfd, char * const *argv) | |
80 | { | |
81 | char c; | |
82 | int i; | |
83 | SIM_DESC sd = sim_state_alloc (kind, callback); | |
84 | ||
ba307cdd MF |
85 | /* Set default options before parsing user options. */ |
86 | current_alignment = STRICT_ALIGNMENT; | |
f9a4d543 | 87 | current_target_byte_order = BFD_ENDIAN_LITTLE; |
ba307cdd | 88 | |
26da232c | 89 | /* The cpu data is kept in a separately allocated chunk of memory. */ |
d5a71b11 | 90 | if (sim_cpu_alloc_all (sd, 1) != SIM_RC_OK) |
26da232c MF |
91 | { |
92 | free_state (sd); | |
93 | return 0; | |
94 | } | |
95 | ||
96 | if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK) | |
97 | { | |
98 | free_state (sd); | |
99 | return 0; | |
100 | } | |
101 | ||
102 | /* XXX: Default to the Virtual environment. */ | |
103 | if (STATE_ENVIRONMENT (sd) == ALL_ENVIRONMENT) | |
104 | STATE_ENVIRONMENT (sd) = VIRTUAL_ENVIRONMENT; | |
105 | ||
106 | /* The parser will print an error message for us, so we silently return. */ | |
107 | if (sim_parse_args (sd, argv) != SIM_RC_OK) | |
108 | { | |
109 | free_state (sd); | |
110 | return 0; | |
111 | } | |
112 | ||
113 | /* Check for/establish the a reference program image. */ | |
114 | if (sim_analyze_program (sd, | |
115 | (STATE_PROG_ARGV (sd) != NULL | |
116 | ? *STATE_PROG_ARGV (sd) | |
117 | : NULL), abfd) != SIM_RC_OK) | |
118 | { | |
119 | free_state (sd); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | /* Establish any remaining configuration options. */ | |
124 | if (sim_config (sd) != SIM_RC_OK) | |
125 | { | |
126 | free_state (sd); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | if (sim_post_argv_init (sd) != SIM_RC_OK) | |
131 | { | |
132 | free_state (sd); | |
133 | return 0; | |
134 | } | |
135 | ||
136 | /* CPU specific initialization. */ | |
137 | for (i = 0; i < MAX_NR_PROCESSORS; ++i) | |
138 | { | |
139 | SIM_CPU *cpu = STATE_CPU (sd, i); | |
140 | ||
141 | initialize_cpu (sd, cpu); | |
142 | } | |
143 | ||
144 | /* Allocate external memory if none specified by user. | |
145 | Use address 4 here in case the user wanted address 0 unmapped. */ | |
146 | if (sim_core_read_buffer (sd, NULL, read_map, &c, 4, 1) == 0) | |
147 | sim_do_commandf (sd, "memory-size %#x", DEFAULT_MEM_SIZE); | |
148 | ||
149 | return sd; | |
150 | } | |
151 | \f | |
152 | /* Prepare to run a program that has already been loaded into memory. | |
153 | ||
154 | Usually you do not need to change things here. */ | |
155 | ||
156 | SIM_RC | |
157 | sim_create_inferior (SIM_DESC sd, struct bfd *abfd, | |
158 | char * const *argv, char * const *env) | |
159 | { | |
160 | SIM_CPU *cpu = STATE_CPU (sd, 0); | |
161 | sim_cia addr; | |
162 | ||
163 | /* Set the PC. */ | |
164 | if (abfd != NULL) | |
165 | addr = bfd_get_start_address (abfd); | |
166 | else | |
167 | addr = 0; | |
168 | sim_pc_set (cpu, addr); | |
169 | ||
170 | /* Standalone mode (i.e. `run`) will take care of the argv for us in | |
171 | sim_open() -> sim_parse_args(). But in debug mode (i.e. 'target sim' | |
172 | with `gdb`), we need to handle it because the user can change the | |
173 | argv on the fly via gdb's 'run'. */ | |
174 | if (STATE_PROG_ARGV (sd) != argv) | |
175 | { | |
176 | freeargv (STATE_PROG_ARGV (sd)); | |
177 | STATE_PROG_ARGV (sd) = dupargv (argv); | |
178 | } | |
179 | ||
180 | return SIM_RC_OK; | |
181 | } |