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c906108c SS |
1 | /* Low level interface to simulators, for the remote server for GDB. |
2 | Copyright (C) 1995, 1996 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "bfd.h" | |
22 | #include "server.h" | |
23 | #include "callback.h" /* GDB simulator callback interface */ | |
24 | #include "remote-sim.h" /* GDB simulator interface */ | |
25 | ||
26 | extern int remote_debug; | |
27 | ||
28 | extern host_callback default_callback; /* in sim/common/callback.c */ | |
29 | ||
30 | char registers[REGISTER_BYTES] __attribute__ ((aligned)); | |
31 | ||
32 | int target_byte_order; /* used by simulator */ | |
33 | ||
34 | /* We record the result of sim_open so we can pass it | |
35 | back to the other sim_foo routines. */ | |
36 | static SIM_DESC gdbsim_desc = 0; | |
37 | ||
38 | /* This version of "load" should be usable for any simulator that | |
39 | does not support loading itself. */ | |
40 | ||
41 | static void | |
42 | generic_load (loadfile_bfd) | |
43 | bfd *loadfile_bfd; | |
44 | { | |
45 | asection *s; | |
46 | ||
47 | for (s = loadfile_bfd->sections; s; s = s->next) | |
48 | { | |
49 | if (s->flags & SEC_LOAD) | |
50 | { | |
51 | bfd_size_type size; | |
52 | ||
53 | size = bfd_get_section_size_before_reloc (s); | |
54 | if (size > 0) | |
55 | { | |
56 | char *buffer; | |
57 | bfd_vma lma; /* use load address, not virtual address */ | |
58 | ||
59 | buffer = xmalloc (size); | |
60 | lma = s->lma; | |
61 | ||
62 | /* Is this really necessary? I guess it gives the user something | |
63 | to look at during a long download. */ | |
64 | printf ("Loading section %s, size 0x%lx lma 0x%lx\n", | |
65 | bfd_get_section_name (loadfile_bfd, s), | |
66 | (unsigned long) size, | |
67 | (unsigned long) lma); /* chops high 32 bits. FIXME!! */ | |
68 | ||
69 | bfd_get_section_contents (loadfile_bfd, s, buffer, 0, size); | |
70 | ||
71 | write_inferior_memory (lma, buffer, size); | |
72 | free (buffer); | |
73 | } | |
74 | } | |
75 | } | |
76 | ||
77 | printf ("Start address 0x%lx\n", | |
78 | (unsigned long)loadfile_bfd->start_address); | |
79 | ||
80 | /* We were doing this in remote-mips.c, I suspect it is right | |
81 | for other targets too. */ | |
82 | /* write_pc (loadfile_bfd->start_address); */ /* FIXME!! */ | |
83 | } | |
84 | ||
85 | int | |
86 | create_inferior (program, argv) | |
87 | char *program; | |
88 | char **argv; | |
89 | { | |
90 | bfd *abfd; | |
91 | int pid = 0; | |
92 | #ifdef TARGET_BYTE_ORDER_SELECTABLE | |
93 | char **new_argv; | |
94 | int nargs; | |
95 | #endif | |
96 | ||
97 | abfd = bfd_openr (program, 0); | |
98 | if (!abfd) | |
99 | { | |
100 | fprintf (stderr, "gdbserver: can't open %s: %s\n", | |
101 | program, bfd_errmsg (bfd_get_error ())); | |
102 | exit (1); | |
103 | } | |
104 | ||
105 | if (!bfd_check_format (abfd, bfd_object)) | |
106 | { | |
107 | fprintf (stderr, "gdbserver: unknown load format for %s: %s\n", | |
108 | program, bfd_errmsg (bfd_get_error ())); | |
109 | exit (1); | |
110 | } | |
111 | ||
112 | #ifdef TARGET_BYTE_ORDER_SELECTABLE | |
113 | /* Add "-E big" or "-E little" to the argument list depending on the | |
114 | endianness of the program to be loaded. */ | |
115 | for (nargs = 0; argv[nargs] != NULL; nargs++) /* count the args */ | |
116 | ; | |
117 | new_argv = alloca (sizeof (char *) * (nargs + 3)); /* allocate new args */ | |
118 | for (nargs = 0; argv[nargs] != NULL; nargs++) /* copy old to new */ | |
119 | new_argv[nargs] = argv[nargs]; | |
120 | new_argv[nargs] = "-E"; | |
121 | new_argv[nargs + 1] = bfd_big_endian (abfd) ? "big" : "little"; | |
122 | new_argv[nargs + 2] = NULL; | |
123 | argv = new_argv; | |
124 | #endif | |
125 | ||
126 | /* Create an instance of the simulator. */ | |
127 | default_callback.init (&default_callback); | |
128 | gdbsim_desc = sim_open (SIM_OPEN_STANDALONE, &default_callback, abfd, argv); | |
129 | if (gdbsim_desc == 0) | |
130 | exit (1); | |
131 | ||
132 | /* Load the program into the simulator. */ | |
133 | if (abfd) | |
134 | if (sim_load (gdbsim_desc, program, NULL, 0) == SIM_RC_FAIL) | |
135 | generic_load (abfd); | |
136 | ||
137 | /* Create an inferior process in the simulator. This initializes SP. */ | |
138 | sim_create_inferior (gdbsim_desc, abfd, argv, /* env */ NULL); | |
139 | sim_resume (gdbsim_desc, 1, 0); /* execute one instr */ | |
140 | return pid; | |
141 | } | |
142 | ||
143 | /* Kill the inferior process. Make us have no inferior. */ | |
144 | ||
145 | void | |
146 | kill_inferior () | |
147 | { | |
148 | sim_close (gdbsim_desc, 0); | |
149 | default_callback.shutdown (&default_callback); | |
150 | } | |
151 | ||
152 | /* Fetch one register. */ | |
153 | ||
154 | static void | |
155 | fetch_register (regno) | |
156 | int regno; | |
157 | { | |
158 | sim_fetch_register (gdbsim_desc, regno, ®isters[REGISTER_BYTE (regno)], | |
159 | REGISTER_RAW_SIZE (regno)); | |
160 | } | |
161 | ||
162 | /* Fetch all registers, or just one, from the child process. */ | |
163 | ||
164 | void | |
165 | fetch_inferior_registers (regno) | |
166 | int regno; | |
167 | { | |
168 | if (regno == -1 || regno == 0) | |
169 | for (regno = 0; regno < NUM_REGS/*-NUM_FREGS*/; regno++) | |
170 | fetch_register (regno); | |
171 | else | |
172 | fetch_register (regno); | |
173 | } | |
174 | ||
175 | /* Store our register values back into the inferior. | |
176 | If REGNO is -1, do this for all registers. | |
177 | Otherwise, REGNO specifies which register (so we can save time). */ | |
178 | ||
179 | void | |
180 | store_inferior_registers (regno) | |
181 | int regno; | |
182 | { | |
183 | if (regno == -1) | |
184 | { | |
185 | for (regno = 0; regno < NUM_REGS; regno++) | |
186 | store_inferior_registers (regno); | |
187 | } | |
188 | else | |
189 | sim_store_register (gdbsim_desc, regno, ®isters[REGISTER_BYTE (regno)], | |
190 | REGISTER_RAW_SIZE (regno)); | |
191 | } | |
192 | ||
193 | /* Return nonzero if the given thread is still alive. */ | |
194 | int | |
195 | mythread_alive (pid) | |
196 | int pid; | |
197 | { | |
198 | return 1; | |
199 | } | |
200 | ||
201 | /* Wait for process, returns status */ | |
202 | ||
203 | unsigned char | |
204 | mywait (status) | |
205 | char *status; | |
206 | { | |
207 | int sigrc; | |
208 | enum sim_stop reason; | |
209 | ||
210 | sim_stop_reason (gdbsim_desc, &reason, &sigrc); | |
211 | switch (reason) | |
212 | { | |
213 | case sim_exited: | |
214 | if (remote_debug) | |
215 | printf ("\nChild exited with retcode = %x \n", sigrc); | |
216 | *status = 'W'; | |
217 | return sigrc; | |
218 | ||
219 | #if 0 | |
220 | case sim_stopped: | |
221 | if (remote_debug) | |
222 | printf ("\nChild terminated with signal = %x \n", sigrc); | |
223 | *status = 'X'; | |
224 | return sigrc; | |
225 | #endif | |
226 | ||
227 | default: /* should this be sim_signalled or sim_stopped? FIXME!! */ | |
228 | if (remote_debug) | |
229 | printf ("\nChild received signal = %x \n", sigrc); | |
230 | fetch_inferior_registers (0); | |
231 | *status = 'T'; | |
232 | return (unsigned char) sigrc; | |
233 | } | |
234 | } | |
235 | ||
236 | /* Resume execution of the inferior process. | |
237 | If STEP is nonzero, single-step it. | |
238 | If SIGNAL is nonzero, give it that signal. */ | |
239 | ||
240 | void | |
241 | myresume (step, signo) | |
242 | int step; | |
243 | int signo; | |
244 | { | |
245 | /* Should be using target_signal_to_host() or signal numbers in target.h | |
246 | to convert GDB signal number to target signal number. */ | |
247 | sim_resume (gdbsim_desc, step, signo); | |
248 | } | |
249 | ||
250 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
251 | to debugger memory starting at MYADDR. */ | |
252 | ||
253 | void | |
254 | read_inferior_memory (memaddr, myaddr, len) | |
255 | CORE_ADDR memaddr; | |
256 | char *myaddr; | |
257 | int len; | |
258 | { | |
259 | sim_read (gdbsim_desc, memaddr, myaddr, len); | |
260 | } | |
261 | ||
262 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
263 | to inferior's memory at MEMADDR. | |
264 | On failure (cannot write the inferior) | |
265 | returns the value of errno. */ | |
266 | ||
267 | int | |
268 | write_inferior_memory (memaddr, myaddr, len) | |
269 | CORE_ADDR memaddr; | |
270 | char *myaddr; | |
271 | int len; | |
272 | { | |
273 | sim_write (gdbsim_desc, memaddr, myaddr, len); /* should check for error. FIXME!! */ | |
274 | return 0; | |
275 | } | |
276 | ||
277 | #if 0 | |
278 | void | |
279 | initialize () | |
280 | { | |
281 | inferior_pid = 0; | |
282 | } | |
283 | ||
284 | int | |
285 | have_inferior_p () | |
286 | { | |
287 | return inferior_pid != 0; | |
288 | } | |
289 | #endif |