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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 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "bfd.h" | |
23 | #include "server.h" | |
c5aa993b JM |
24 | #include "callback.h" /* GDB simulator callback interface */ |
25 | #include "remote-sim.h" /* GDB simulator interface */ | |
c906108c SS |
26 | |
27 | extern int remote_debug; | |
28 | ||
29 | extern host_callback default_callback; /* in sim/common/callback.c */ | |
30 | ||
31 | char registers[REGISTER_BYTES] __attribute__ ((aligned)); | |
32 | ||
c5aa993b | 33 | int target_byte_order; /* used by simulator */ |
c906108c SS |
34 | |
35 | /* We record the result of sim_open so we can pass it | |
36 | back to the other sim_foo routines. */ | |
37 | static SIM_DESC gdbsim_desc = 0; | |
38 | ||
39 | /* This version of "load" should be usable for any simulator that | |
40 | does not support loading itself. */ | |
41 | ||
42 | static void | |
43 | generic_load (loadfile_bfd) | |
c5aa993b | 44 | bfd *loadfile_bfd; |
c906108c SS |
45 | { |
46 | asection *s; | |
47 | ||
c5aa993b | 48 | for (s = loadfile_bfd->sections; s; s = s->next) |
c906108c | 49 | { |
c5aa993b | 50 | if (s->flags & SEC_LOAD) |
c906108c SS |
51 | { |
52 | bfd_size_type size; | |
53 | ||
54 | size = bfd_get_section_size_before_reloc (s); | |
55 | if (size > 0) | |
56 | { | |
57 | char *buffer; | |
58 | bfd_vma lma; /* use load address, not virtual address */ | |
59 | ||
60 | buffer = xmalloc (size); | |
61 | lma = s->lma; | |
62 | ||
63 | /* Is this really necessary? I guess it gives the user something | |
c5aa993b | 64 | to look at during a long download. */ |
c906108c SS |
65 | printf ("Loading section %s, size 0x%lx lma 0x%lx\n", |
66 | bfd_get_section_name (loadfile_bfd, s), | |
67 | (unsigned long) size, | |
c5aa993b | 68 | (unsigned long) lma); /* chops high 32 bits. FIXME!! */ |
c906108c SS |
69 | |
70 | bfd_get_section_contents (loadfile_bfd, s, buffer, 0, size); | |
71 | ||
72 | write_inferior_memory (lma, buffer, size); | |
73 | free (buffer); | |
74 | } | |
75 | } | |
76 | } | |
77 | ||
78 | printf ("Start address 0x%lx\n", | |
c5aa993b | 79 | (unsigned long) loadfile_bfd->start_address); |
c906108c SS |
80 | |
81 | /* We were doing this in remote-mips.c, I suspect it is right | |
82 | for other targets too. */ | |
c5aa993b | 83 | /* write_pc (loadfile_bfd->start_address); *//* FIXME!! */ |
c906108c SS |
84 | } |
85 | ||
86 | int | |
87 | create_inferior (program, argv) | |
88 | char *program; | |
89 | char **argv; | |
90 | { | |
91 | bfd *abfd; | |
92 | int pid = 0; | |
93 | #ifdef TARGET_BYTE_ORDER_SELECTABLE | |
94 | char **new_argv; | |
95 | int nargs; | |
96 | #endif | |
97 | ||
98 | abfd = bfd_openr (program, 0); | |
c5aa993b | 99 | if (!abfd) |
c906108c | 100 | { |
c5aa993b | 101 | fprintf (stderr, "gdbserver: can't open %s: %s\n", |
c906108c SS |
102 | program, bfd_errmsg (bfd_get_error ())); |
103 | exit (1); | |
104 | } | |
105 | ||
106 | if (!bfd_check_format (abfd, bfd_object)) | |
107 | { | |
108 | fprintf (stderr, "gdbserver: unknown load format for %s: %s\n", | |
109 | program, bfd_errmsg (bfd_get_error ())); | |
110 | exit (1); | |
111 | } | |
112 | ||
113 | #ifdef TARGET_BYTE_ORDER_SELECTABLE | |
114 | /* Add "-E big" or "-E little" to the argument list depending on the | |
115 | endianness of the program to be loaded. */ | |
116 | for (nargs = 0; argv[nargs] != NULL; nargs++) /* count the args */ | |
117 | ; | |
118 | new_argv = alloca (sizeof (char *) * (nargs + 3)); /* allocate new args */ | |
119 | for (nargs = 0; argv[nargs] != NULL; nargs++) /* copy old to new */ | |
120 | new_argv[nargs] = argv[nargs]; | |
121 | new_argv[nargs] = "-E"; | |
122 | new_argv[nargs + 1] = bfd_big_endian (abfd) ? "big" : "little"; | |
123 | new_argv[nargs + 2] = NULL; | |
124 | argv = new_argv; | |
125 | #endif | |
126 | ||
127 | /* Create an instance of the simulator. */ | |
128 | default_callback.init (&default_callback); | |
129 | gdbsim_desc = sim_open (SIM_OPEN_STANDALONE, &default_callback, abfd, argv); | |
130 | if (gdbsim_desc == 0) | |
131 | exit (1); | |
132 | ||
133 | /* Load the program into the simulator. */ | |
134 | if (abfd) | |
135 | if (sim_load (gdbsim_desc, program, NULL, 0) == SIM_RC_FAIL) | |
136 | generic_load (abfd); | |
137 | ||
138 | /* Create an inferior process in the simulator. This initializes SP. */ | |
139 | sim_create_inferior (gdbsim_desc, abfd, argv, /* env */ NULL); | |
140 | sim_resume (gdbsim_desc, 1, 0); /* execute one instr */ | |
141 | return pid; | |
142 | } | |
143 | ||
144 | /* Kill the inferior process. Make us have no inferior. */ | |
145 | ||
146 | void | |
147 | kill_inferior () | |
148 | { | |
149 | sim_close (gdbsim_desc, 0); | |
150 | default_callback.shutdown (&default_callback); | |
151 | } | |
152 | ||
153 | /* Fetch one register. */ | |
154 | ||
155 | static void | |
156 | fetch_register (regno) | |
157 | int regno; | |
158 | { | |
159 | sim_fetch_register (gdbsim_desc, regno, ®isters[REGISTER_BYTE (regno)], | |
160 | REGISTER_RAW_SIZE (regno)); | |
161 | } | |
162 | ||
163 | /* Fetch all registers, or just one, from the child process. */ | |
164 | ||
165 | void | |
166 | fetch_inferior_registers (regno) | |
167 | int regno; | |
168 | { | |
169 | if (regno == -1 || regno == 0) | |
c5aa993b | 170 | for (regno = 0; regno < NUM_REGS /*-NUM_FREGS*/ ; regno++) |
c906108c SS |
171 | fetch_register (regno); |
172 | else | |
173 | fetch_register (regno); | |
174 | } | |
175 | ||
176 | /* Store our register values back into the inferior. | |
177 | If REGNO is -1, do this for all registers. | |
178 | Otherwise, REGNO specifies which register (so we can save time). */ | |
179 | ||
180 | void | |
181 | store_inferior_registers (regno) | |
182 | int regno; | |
183 | { | |
c5aa993b | 184 | if (regno == -1) |
c906108c SS |
185 | { |
186 | for (regno = 0; regno < NUM_REGS; regno++) | |
187 | store_inferior_registers (regno); | |
188 | } | |
189 | else | |
190 | sim_store_register (gdbsim_desc, regno, ®isters[REGISTER_BYTE (regno)], | |
191 | REGISTER_RAW_SIZE (regno)); | |
192 | } | |
193 | ||
194 | /* Return nonzero if the given thread is still alive. */ | |
195 | int | |
196 | mythread_alive (pid) | |
197 | int pid; | |
198 | { | |
199 | return 1; | |
200 | } | |
201 | ||
202 | /* Wait for process, returns status */ | |
203 | ||
204 | unsigned char | |
205 | mywait (status) | |
206 | char *status; | |
207 | { | |
208 | int sigrc; | |
209 | enum sim_stop reason; | |
210 | ||
211 | sim_stop_reason (gdbsim_desc, &reason, &sigrc); | |
212 | switch (reason) | |
213 | { | |
214 | case sim_exited: | |
215 | if (remote_debug) | |
216 | printf ("\nChild exited with retcode = %x \n", sigrc); | |
217 | *status = 'W'; | |
218 | return sigrc; | |
219 | ||
220 | #if 0 | |
221 | case sim_stopped: | |
222 | if (remote_debug) | |
223 | printf ("\nChild terminated with signal = %x \n", sigrc); | |
224 | *status = 'X'; | |
225 | return sigrc; | |
226 | #endif | |
227 | ||
c5aa993b | 228 | default: /* should this be sim_signalled or sim_stopped? FIXME!! */ |
c906108c SS |
229 | if (remote_debug) |
230 | printf ("\nChild received signal = %x \n", sigrc); | |
231 | fetch_inferior_registers (0); | |
232 | *status = 'T'; | |
233 | return (unsigned char) sigrc; | |
234 | } | |
235 | } | |
236 | ||
237 | /* Resume execution of the inferior process. | |
238 | If STEP is nonzero, single-step it. | |
239 | If SIGNAL is nonzero, give it that signal. */ | |
240 | ||
241 | void | |
242 | myresume (step, signo) | |
243 | int step; | |
244 | int signo; | |
245 | { | |
246 | /* Should be using target_signal_to_host() or signal numbers in target.h | |
247 | to convert GDB signal number to target signal number. */ | |
248 | sim_resume (gdbsim_desc, step, signo); | |
249 | } | |
250 | ||
251 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
252 | to debugger memory starting at MYADDR. */ | |
253 | ||
254 | void | |
255 | read_inferior_memory (memaddr, myaddr, len) | |
256 | CORE_ADDR memaddr; | |
257 | char *myaddr; | |
258 | int len; | |
259 | { | |
260 | sim_read (gdbsim_desc, memaddr, myaddr, len); | |
261 | } | |
262 | ||
263 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
264 | to inferior's memory at MEMADDR. | |
265 | On failure (cannot write the inferior) | |
266 | returns the value of errno. */ | |
267 | ||
268 | int | |
269 | write_inferior_memory (memaddr, myaddr, len) | |
270 | CORE_ADDR memaddr; | |
271 | char *myaddr; | |
272 | int len; | |
273 | { | |
c5aa993b | 274 | sim_write (gdbsim_desc, memaddr, myaddr, len); /* should check for error. FIXME!! */ |
c906108c SS |
275 | return 0; |
276 | } | |
277 | ||
278 | #if 0 | |
279 | void | |
280 | initialize () | |
281 | { | |
282 | inferior_pid = 0; | |
283 | } | |
284 | ||
285 | int | |
286 | have_inferior_p () | |
287 | { | |
288 | return inferior_pid != 0; | |
289 | } | |
290 | #endif |