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26da232c MF |
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 | 30 | |
8cfc9a18 | 31 | #include "sim/callback.h" |
26da232c MF |
32 | #include "sim-main.h" |
33 | #include "sim-options.h" | |
34 | \f | |
35 | /* This function is the main loop. It should process ticks and decode+execute | |
36 | a single instruction. | |
37 | ||
38 | Usually you do not need to change things here. */ | |
39 | ||
40 | void | |
41 | sim_engine_run (SIM_DESC sd, | |
42 | int next_cpu_nr, /* ignore */ | |
43 | int nr_cpus, /* ignore */ | |
44 | int siggnal) /* ignore */ | |
45 | { | |
46 | SIM_CPU *cpu; | |
47 | ||
48 | SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); | |
49 | ||
50 | cpu = STATE_CPU (sd, 0); | |
51 | ||
52 | while (1) | |
53 | { | |
54 | step_once (cpu); | |
55 | if (sim_events_tick (sd)) | |
56 | sim_events_process (sd); | |
57 | } | |
58 | } | |
59 | \f | |
60 | /* Initialize the simulator from scratch. This is called once per lifetime of | |
61 | the simulation. Think of it as a processor reset. | |
62 | ||
63 | Usually all cpu-specific setup is handled in the initialize_cpu callback. | |
64 | If you want to do cpu-independent stuff, then it should go at the end (see | |
65 | where memory is initialized). */ | |
66 | ||
67 | #define DEFAULT_MEM_SIZE (16 * 1024 * 1024) | |
68 | ||
69 | static void | |
70 | free_state (SIM_DESC sd) | |
71 | { | |
72 | if (STATE_MODULES (sd) != NULL) | |
73 | sim_module_uninstall (sd); | |
74 | sim_cpu_free_all (sd); | |
75 | sim_state_free (sd); | |
76 | } | |
77 | ||
78 | SIM_DESC | |
79 | sim_open (SIM_OPEN_KIND kind, host_callback *callback, | |
80 | struct bfd *abfd, char * const *argv) | |
81 | { | |
82 | char c; | |
83 | int i; | |
84 | SIM_DESC sd = sim_state_alloc (kind, callback); | |
85 | ||
ba307cdd MF |
86 | /* Set default options before parsing user options. */ |
87 | current_alignment = STRICT_ALIGNMENT; | |
f9a4d543 | 88 | current_target_byte_order = BFD_ENDIAN_LITTLE; |
ba307cdd | 89 | |
26da232c | 90 | /* The cpu data is kept in a separately allocated chunk of memory. */ |
d5a71b11 | 91 | if (sim_cpu_alloc_all (sd, 1) != SIM_RC_OK) |
26da232c MF |
92 | { |
93 | free_state (sd); | |
94 | return 0; | |
95 | } | |
96 | ||
97 | if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK) | |
98 | { | |
99 | free_state (sd); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | /* XXX: Default to the Virtual environment. */ | |
104 | if (STATE_ENVIRONMENT (sd) == ALL_ENVIRONMENT) | |
105 | STATE_ENVIRONMENT (sd) = VIRTUAL_ENVIRONMENT; | |
106 | ||
107 | /* The parser will print an error message for us, so we silently return. */ | |
108 | if (sim_parse_args (sd, argv) != SIM_RC_OK) | |
109 | { | |
110 | free_state (sd); | |
111 | return 0; | |
112 | } | |
113 | ||
114 | /* Check for/establish the a reference program image. */ | |
e8f20a28 | 115 | if (sim_analyze_program (sd, STATE_PROG_FILE (sd), abfd) != SIM_RC_OK) |
26da232c MF |
116 | { |
117 | free_state (sd); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | /* Establish any remaining configuration options. */ | |
122 | if (sim_config (sd) != SIM_RC_OK) | |
123 | { | |
124 | free_state (sd); | |
125 | return 0; | |
126 | } | |
127 | ||
128 | if (sim_post_argv_init (sd) != SIM_RC_OK) | |
129 | { | |
130 | free_state (sd); | |
131 | return 0; | |
132 | } | |
133 | ||
134 | /* CPU specific initialization. */ | |
135 | for (i = 0; i < MAX_NR_PROCESSORS; ++i) | |
136 | { | |
137 | SIM_CPU *cpu = STATE_CPU (sd, i); | |
138 | ||
139 | initialize_cpu (sd, cpu); | |
140 | } | |
141 | ||
142 | /* Allocate external memory if none specified by user. | |
143 | Use address 4 here in case the user wanted address 0 unmapped. */ | |
144 | if (sim_core_read_buffer (sd, NULL, read_map, &c, 4, 1) == 0) | |
145 | sim_do_commandf (sd, "memory-size %#x", DEFAULT_MEM_SIZE); | |
146 | ||
147 | return sd; | |
148 | } | |
149 | \f | |
150 | /* Prepare to run a program that has already been loaded into memory. | |
151 | ||
152 | Usually you do not need to change things here. */ | |
153 | ||
154 | SIM_RC | |
155 | sim_create_inferior (SIM_DESC sd, struct bfd *abfd, | |
156 | char * const *argv, char * const *env) | |
157 | { | |
158 | SIM_CPU *cpu = STATE_CPU (sd, 0); | |
8cfc9a18 | 159 | host_callback *cb = STATE_CALLBACK (sd); |
26da232c MF |
160 | sim_cia addr; |
161 | ||
162 | /* Set the PC. */ | |
163 | if (abfd != NULL) | |
164 | addr = bfd_get_start_address (abfd); | |
165 | else | |
166 | addr = 0; | |
167 | sim_pc_set (cpu, addr); | |
168 | ||
169 | /* Standalone mode (i.e. `run`) will take care of the argv for us in | |
170 | sim_open() -> sim_parse_args(). But in debug mode (i.e. 'target sim' | |
171 | with `gdb`), we need to handle it because the user can change the | |
172 | argv on the fly via gdb's 'run'. */ | |
173 | if (STATE_PROG_ARGV (sd) != argv) | |
174 | { | |
175 | freeargv (STATE_PROG_ARGV (sd)); | |
176 | STATE_PROG_ARGV (sd) = dupargv (argv); | |
177 | } | |
178 | ||
54f7a83a MF |
179 | if (STATE_PROG_ENVP (sd) != env) |
180 | { | |
181 | freeargv (STATE_PROG_ENVP (sd)); | |
182 | STATE_PROG_ENVP (sd) = dupargv (env); | |
183 | } | |
184 | ||
8cfc9a18 MF |
185 | cb->argv = STATE_PROG_ARGV (sd); |
186 | cb->envp = STATE_PROG_ENVP (sd); | |
187 | ||
26da232c MF |
188 | return SIM_RC_OK; |
189 | } |