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sim: unify symbol table handling
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1 /* Main simulator entry points specific to Lattice Mico32.
2 Contributed by Jon Beniston <jon@beniston.com>
3
4 Copyright (C) 2009-2016 Free Software Foundation, Inc.
5
6 This file is part of GDB.
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 #include "sim-main.h"
22 #include "sim-options.h"
23 #include "libiberty.h"
24 #include "bfd.h"
25
26 #ifdef HAVE_STDLIB_H
27 #include <stdlib.h>
28 #endif
29 \f
30 /* Cover function of sim_state_free to free the cpu buffers as well. */
31
32 static void
33 free_state (SIM_DESC sd)
34 {
35 if (STATE_MODULES (sd) != NULL)
36 sim_module_uninstall (sd);
37 sim_cpu_free_all (sd);
38 sim_state_free (sd);
39 }
40
41 /* Find memory range used by program. */
42
43 static unsigned long
44 find_base (bfd *prog_bfd)
45 {
46 int found;
47 unsigned long base = ~(0UL);
48 asection *s;
49
50 found = 0;
51 for (s = prog_bfd->sections; s; s = s->next)
52 {
53 if ((strcmp (bfd_get_section_name (prog_bfd, s), ".boot") == 0)
54 || (strcmp (bfd_get_section_name (prog_bfd, s), ".text") == 0)
55 || (strcmp (bfd_get_section_name (prog_bfd, s), ".data") == 0)
56 || (strcmp (bfd_get_section_name (prog_bfd, s), ".bss") == 0))
57 {
58 if (!found)
59 {
60 base = bfd_get_section_vma (prog_bfd, s);
61 found = 1;
62 }
63 else
64 base =
65 bfd_get_section_vma (prog_bfd,
66 s) < base ? bfd_get_section_vma (prog_bfd,
67 s) : base;
68 }
69 }
70 return base & ~(0xffffUL);
71 }
72
73 static unsigned long
74 find_limit (SIM_DESC sd)
75 {
76 bfd_vma addr;
77
78 addr = trace_sym_value (sd, "_fstack");
79 if (addr == -1)
80 return 0;
81
82 return (addr + 65536) & ~(0xffffUL);
83 }
84
85 /* Create an instance of the simulator. */
86
87 SIM_DESC
88 sim_open (kind, callback, abfd, argv)
89 SIM_OPEN_KIND kind;
90 host_callback *callback;
91 struct bfd *abfd;
92 char * const *argv;
93 {
94 SIM_DESC sd = sim_state_alloc (kind, callback);
95 char c;
96 int i;
97 unsigned long base, limit;
98
99 /* The cpu data is kept in a separately allocated chunk of memory. */
100 if (sim_cpu_alloc_all (sd, 1, cgen_cpu_max_extra_bytes ()) != SIM_RC_OK)
101 {
102 free_state (sd);
103 return 0;
104 }
105
106 if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
107 {
108 free_state (sd);
109 return 0;
110 }
111
112 /* The parser will print an error message for us, so we silently return. */
113 if (sim_parse_args (sd, argv) != SIM_RC_OK)
114 {
115 free_state (sd);
116 return 0;
117 }
118
119 #if 0
120 /* Allocate a handler for I/O devices
121 if no memory for that range has been allocated by the user.
122 All are allocated in one chunk to keep things from being
123 unnecessarily complicated. */
124 if (sim_core_read_buffer (sd, NULL, read_map, &c, LM32_DEVICE_ADDR, 1) == 0)
125 sim_core_attach (sd, NULL, 0 /*level */ ,
126 access_read_write, 0 /*space ??? */ ,
127 LM32_DEVICE_ADDR, LM32_DEVICE_LEN /*nr_bytes */ ,
128 0 /*modulo */ ,
129 &lm32_devices, NULL /*buffer */ );
130 #endif
131
132 /* check for/establish the reference program image. */
133 if (sim_analyze_program (sd,
134 (STATE_PROG_ARGV (sd) != NULL
135 ? *STATE_PROG_ARGV (sd)
136 : NULL), abfd) != SIM_RC_OK)
137 {
138 free_state (sd);
139 return 0;
140 }
141
142 /* Check to see if memory exists at programs start address. */
143 if (sim_core_read_buffer (sd, NULL, read_map, &c, STATE_START_ADDR (sd), 1)
144 == 0)
145 {
146 if (STATE_PROG_BFD (sd) != NULL)
147 {
148 /* It doesn't, so we should try to allocate enough memory to hold program. */
149 base = find_base (STATE_PROG_BFD (sd));
150 limit = find_limit (sd);
151 if (limit == 0)
152 {
153 sim_io_eprintf (sd,
154 "Failed to find symbol _fstack in program. You must specify memory regions with --memory-region.\n");
155 free_state (sd);
156 return 0;
157 }
158 /*sim_io_printf (sd, "Allocating memory at 0x%x size 0x%x\n", base, limit); */
159 sim_do_commandf (sd, "memory region 0x%x,0x%x", base, limit);
160 }
161 }
162
163 /* Establish any remaining configuration options. */
164 if (sim_config (sd) != SIM_RC_OK)
165 {
166 free_state (sd);
167 return 0;
168 }
169
170 if (sim_post_argv_init (sd) != SIM_RC_OK)
171 {
172 free_state (sd);
173 return 0;
174 }
175
176 /* Open a copy of the cpu descriptor table. */
177 {
178 CGEN_CPU_DESC cd =
179 lm32_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
180 CGEN_ENDIAN_BIG);
181 for (i = 0; i < MAX_NR_PROCESSORS; ++i)
182 {
183 SIM_CPU *cpu = STATE_CPU (sd, i);
184 CPU_CPU_DESC (cpu) = cd;
185 CPU_DISASSEMBLER (cpu) = sim_cgen_disassemble_insn;
186 }
187 lm32_cgen_init_dis (cd);
188 }
189
190 /* Initialize various cgen things not done by common framework.
191 Must be done after lm32_cgen_cpu_open. */
192 cgen_init (sd);
193
194 return sd;
195 }
196 \f
197 SIM_RC
198 sim_create_inferior (sd, abfd, argv, envp)
199 SIM_DESC sd;
200 struct bfd *abfd;
201 char * const *argv;
202 char * const *envp;
203 {
204 SIM_CPU *current_cpu = STATE_CPU (sd, 0);
205 SIM_ADDR addr;
206
207 if (abfd != NULL)
208 addr = bfd_get_start_address (abfd);
209 else
210 addr = 0;
211 sim_pc_set (current_cpu, addr);
212
213 /* Standalone mode (i.e. `run`) will take care of the argv for us in
214 sim_open() -> sim_parse_args(). But in debug mode (i.e. 'target sim'
215 with `gdb`), we need to handle it because the user can change the
216 argv on the fly via gdb's 'run'. */
217 if (STATE_PROG_ARGV (sd) != argv)
218 {
219 freeargv (STATE_PROG_ARGV (sd));
220 STATE_PROG_ARGV (sd) = dupargv (argv);
221 }
222
223 return SIM_RC_OK;
224 }