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1 | /* Example synacor simulator. | |
2 | ||
3 | Copyright (C) 2005-2022 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 | ||
25 | For more specific details on these functions, see the sim/sim.h header | |
26 | file. */ | |
27 | ||
28 | /* This must come before any other includes. */ | |
29 | #include "defs.h" | |
30 | ||
31 | #include "sim/callback.h" | |
32 | #include "sim-main.h" | |
33 | #include "sim-options.h" | |
34 | ||
35 | #include "example-synacor-sim.h" | |
36 | \f | |
37 | /* This function is the main loop. It should process ticks and decode+execute | |
38 | a single instruction. | |
39 | ||
40 | Usually you do not need to change things here. */ | |
41 | ||
42 | void | |
43 | sim_engine_run (SIM_DESC sd, | |
44 | int next_cpu_nr, /* ignore */ | |
45 | int nr_cpus, /* ignore */ | |
46 | int siggnal) /* ignore */ | |
47 | { | |
48 | SIM_CPU *cpu; | |
49 | ||
50 | SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); | |
51 | ||
52 | cpu = STATE_CPU (sd, 0); | |
53 | ||
54 | while (1) | |
55 | { | |
56 | step_once (cpu); | |
57 | if (sim_events_tick (sd)) | |
58 | sim_events_process (sd); | |
59 | } | |
60 | } | |
61 | \f | |
62 | /* Initialize the simulator from scratch. This is called once per lifetime of | |
63 | the simulation. Think of it as a processor reset. | |
64 | ||
65 | Usually all cpu-specific setup is handled in the initialize_cpu callback. | |
66 | If you want to do cpu-independent stuff, then it should go at the end (see | |
67 | where memory is initialized). */ | |
68 | ||
69 | #define DEFAULT_MEM_SIZE (16 * 1024 * 1024) | |
70 | ||
71 | static void | |
72 | free_state (SIM_DESC sd) | |
73 | { | |
74 | if (STATE_MODULES (sd) != NULL) | |
75 | sim_module_uninstall (sd); | |
76 | sim_cpu_free_all (sd); | |
77 | sim_state_free (sd); | |
78 | } | |
79 | ||
80 | SIM_DESC | |
81 | sim_open (SIM_OPEN_KIND kind, host_callback *callback, | |
82 | struct bfd *abfd, char * const *argv) | |
83 | { | |
84 | char c; | |
85 | int i; | |
86 | SIM_DESC sd = sim_state_alloc (kind, callback); | |
87 | ||
88 | /* Set default options before parsing user options. */ | |
89 | current_alignment = STRICT_ALIGNMENT; | |
90 | current_target_byte_order = BFD_ENDIAN_LITTLE; | |
91 | ||
92 | /* The cpu data is kept in a separately allocated chunk of memory. */ | |
93 | if (sim_cpu_alloc_all_extra (sd, 1, sizeof (struct example_sim_cpu)) | |
94 | != SIM_RC_OK) | |
95 | { | |
96 | free_state (sd); | |
97 | return 0; | |
98 | } | |
99 | ||
100 | if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK) | |
101 | { | |
102 | free_state (sd); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | /* XXX: Default to the Virtual environment. */ | |
107 | if (STATE_ENVIRONMENT (sd) == ALL_ENVIRONMENT) | |
108 | STATE_ENVIRONMENT (sd) = VIRTUAL_ENVIRONMENT; | |
109 | ||
110 | /* The parser will print an error message for us, so we silently return. */ | |
111 | if (sim_parse_args (sd, argv) != SIM_RC_OK) | |
112 | { | |
113 | free_state (sd); | |
114 | return 0; | |
115 | } | |
116 | ||
117 | /* Check for/establish the a reference program image. */ | |
118 | if (sim_analyze_program (sd, STATE_PROG_FILE (sd), abfd) != SIM_RC_OK) | |
119 | { | |
120 | free_state (sd); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | /* Establish any remaining configuration options. */ | |
125 | if (sim_config (sd) != SIM_RC_OK) | |
126 | { | |
127 | free_state (sd); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | if (sim_post_argv_init (sd) != SIM_RC_OK) | |
132 | { | |
133 | free_state (sd); | |
134 | return 0; | |
135 | } | |
136 | ||
137 | /* CPU specific initialization. */ | |
138 | for (i = 0; i < MAX_NR_PROCESSORS; ++i) | |
139 | { | |
140 | SIM_CPU *cpu = STATE_CPU (sd, i); | |
141 | ||
142 | initialize_cpu (sd, cpu); | |
143 | } | |
144 | ||
145 | /* Allocate external memory if none specified by user. | |
146 | Use address 4 here in case the user wanted address 0 unmapped. */ | |
147 | if (sim_core_read_buffer (sd, NULL, read_map, &c, 4, 1) == 0) | |
148 | sim_do_commandf (sd, "memory-size %#x", DEFAULT_MEM_SIZE); | |
149 | ||
150 | return sd; | |
151 | } | |
152 | \f | |
153 | /* Prepare to run a program that has already been loaded into memory. | |
154 | ||
155 | Usually you do not need to change things here. */ | |
156 | ||
157 | SIM_RC | |
158 | sim_create_inferior (SIM_DESC sd, struct bfd *abfd, | |
159 | char * const *argv, char * const *env) | |
160 | { | |
161 | SIM_CPU *cpu = STATE_CPU (sd, 0); | |
162 | host_callback *cb = STATE_CALLBACK (sd); | |
163 | sim_cia addr; | |
164 | ||
165 | /* Set the PC. */ | |
166 | if (abfd != NULL) | |
167 | addr = bfd_get_start_address (abfd); | |
168 | else | |
169 | addr = 0; | |
170 | sim_pc_set (cpu, addr); | |
171 | ||
172 | /* Standalone mode (i.e. `run`) will take care of the argv for us in | |
173 | sim_open() -> sim_parse_args(). But in debug mode (i.e. 'target sim' | |
174 | with `gdb`), we need to handle it because the user can change the | |
175 | argv on the fly via gdb's 'run'. */ | |
176 | if (STATE_PROG_ARGV (sd) != argv) | |
177 | { | |
178 | freeargv (STATE_PROG_ARGV (sd)); | |
179 | STATE_PROG_ARGV (sd) = dupargv (argv); | |
180 | } | |
181 | ||
182 | if (STATE_PROG_ENVP (sd) != env) | |
183 | { | |
184 | freeargv (STATE_PROG_ENVP (sd)); | |
185 | STATE_PROG_ENVP (sd) = dupargv (env); | |
186 | } | |
187 | ||
188 | cb->argv = STATE_PROG_ARGV (sd); | |
189 | cb->envp = STATE_PROG_ENVP (sd); | |
190 | ||
191 | return SIM_RC_OK; | |
192 | } |