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33ef0f93 MA |
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 host_callback default_callback; /* in callback.c */ | |
27 | ||
28 | char registers[REGISTER_BYTES]; | |
29 | ||
30 | int target_byte_order; /* used by simulator */ | |
31 | ||
32 | /* This version of "load" should be usable for any simulator that | |
33 | does not support loading itself. */ | |
34 | ||
35 | static void | |
36 | generic_load (loadfile_bfd) | |
37 | bfd *loadfile_bfd; | |
38 | { | |
39 | asection *s; | |
40 | ||
41 | for (s = loadfile_bfd->sections; s; s = s->next) | |
42 | { | |
43 | if (s->flags & SEC_LOAD) | |
44 | { | |
45 | bfd_size_type size; | |
46 | ||
47 | size = bfd_get_section_size_before_reloc (s); | |
48 | if (size > 0) | |
49 | { | |
50 | char *buffer; | |
51 | bfd_vma vma; | |
52 | ||
53 | buffer = xmalloc (size); | |
54 | vma = bfd_get_section_vma (loadfile_bfd, s); | |
55 | ||
56 | /* Is this really necessary? I guess it gives the user something | |
57 | to look at during a long download. */ | |
58 | fprintf (stderr, "Loading section %s, size 0x%lx vma 0x%lx\n", | |
59 | bfd_get_section_name (loadfile_bfd, s), | |
60 | (unsigned long) size, | |
61 | (unsigned long) vma); /* chops high 32 bits. FIXME!! */ | |
62 | ||
63 | bfd_get_section_contents (loadfile_bfd, s, buffer, 0, size); | |
64 | ||
65 | write_inferior_memory (vma, buffer, size); | |
66 | free (buffer); | |
67 | } | |
68 | } | |
69 | } | |
70 | ||
71 | fprintf (stderr, "Start address 0x%lx\n", | |
72 | (unsigned long)loadfile_bfd->start_address); | |
73 | ||
74 | /* We were doing this in remote-mips.c, I suspect it is right | |
75 | for other targets too. */ | |
76 | /* write_pc (loadfile_bfd->start_address); */ /* FIXME!! */ | |
77 | } | |
78 | ||
79 | int | |
80 | create_inferior (program, allargs) | |
81 | char *program; | |
82 | char **allargs; | |
83 | { | |
84 | bfd *abfd; | |
85 | int pid = 0; | |
86 | ||
87 | abfd = bfd_openr (program, 0); | |
88 | if (!abfd) | |
89 | { | |
90 | fprintf (stderr, "gdbserver: can't open %s: %s\n", | |
91 | program, bfd_errmsg (bfd_get_error ())); | |
92 | exit (1); | |
93 | } | |
94 | ||
95 | if (!bfd_check_format (abfd, bfd_object)) | |
96 | { | |
97 | fprintf (stderr, "gdbserver: unknown load format for %s: %s\n", | |
98 | program, bfd_errmsg (bfd_get_error ())); | |
99 | exit (1); | |
100 | } | |
101 | ||
102 | /* This must be set before sim_open is called, because gdb assumes that | |
103 | the simulator endianness is known immediately after the sim_open call. */ | |
104 | target_byte_order = bfd_big_endian (abfd) ? 4321 : 1234; | |
105 | ||
106 | sim_set_callbacks (&default_callback); | |
107 | default_callback.init (&default_callback); | |
108 | ||
109 | /* Should concatenate args here. FIXME!! */ | |
110 | sim_open (allargs[0]); | |
111 | ||
112 | /* Load program. */ | |
113 | if (sim_load (allargs[0], 0) != 0) | |
114 | generic_load (abfd); | |
115 | ||
116 | return pid; | |
117 | } | |
118 | ||
119 | /* Kill the inferior process. Make us have no inferior. */ | |
120 | ||
121 | void | |
122 | kill_inferior () | |
123 | { | |
124 | sim_close (0); | |
125 | default_callback.shutdown (&default_callback); | |
126 | } | |
127 | ||
128 | /* Fetch one register. */ | |
129 | ||
130 | static void | |
131 | fetch_register (regno) | |
132 | int regno; | |
133 | { | |
134 | sim_fetch_register (regno, ®isters[REGISTER_BYTE (regno)]); | |
135 | } | |
136 | ||
137 | /* Fetch all registers, or just one, from the child process. */ | |
138 | ||
139 | void | |
140 | fetch_inferior_registers (regno) | |
141 | int regno; | |
142 | { | |
143 | if (regno == -1 || regno == 0) | |
144 | for (regno = 0; regno < NUM_REGS/*-NUM_FREGS*/; regno++) | |
145 | fetch_register (regno); | |
146 | else | |
147 | fetch_register (regno); | |
148 | } | |
149 | ||
150 | /* Store our register values back into the inferior. | |
151 | If REGNO is -1, do this for all registers. | |
152 | Otherwise, REGNO specifies which register (so we can save time). */ | |
153 | ||
154 | void | |
155 | store_inferior_registers (regno) | |
156 | int regno; | |
157 | { | |
158 | if (regno == -1) | |
159 | { | |
160 | for (regno = 0; regno < NUM_REGS; regno++) | |
161 | store_inferior_registers (regno); | |
162 | } | |
163 | else | |
164 | sim_store_register (regno, ®isters[REGISTER_BYTE (regno)]); | |
165 | } | |
166 | ||
167 | /* Return nonzero if the given thread is still alive. */ | |
168 | int | |
169 | mythread_alive (pid) | |
170 | int pid; | |
171 | { | |
172 | return 1; | |
173 | } | |
174 | ||
175 | /* Wait for process, returns status */ | |
176 | ||
177 | unsigned char | |
178 | mywait (status) | |
179 | char *status; | |
180 | { | |
181 | int sigrc; | |
182 | enum sim_stop reason; | |
183 | ||
184 | sim_stop_reason (&reason, &sigrc); | |
185 | switch (reason) | |
186 | { | |
187 | case sim_exited: | |
188 | fprintf (stderr, "\nChild exited with retcode = %x \n", sigrc); | |
189 | *status = 'W'; | |
190 | return sigrc; | |
191 | ||
192 | #if 0 | |
193 | case sim_stopped: | |
194 | fprintf (stderr, "\nChild terminated with signal = %x \n", sigrc); | |
195 | *status = 'X'; | |
196 | return sigrc; | |
197 | #endif | |
198 | ||
199 | default: /* should this be sim_signalled or sim_stopped? FIXME!! */ | |
200 | fprintf (stderr, "\nChild received signal = %x \n", sigrc); | |
201 | fetch_inferior_registers (0); | |
202 | *status = 'T'; | |
203 | return (unsigned char) sigrc; | |
204 | } | |
205 | } | |
206 | ||
207 | /* Resume execution of the inferior process. | |
208 | If STEP is nonzero, single-step it. | |
209 | If SIGNAL is nonzero, give it that signal. */ | |
210 | ||
211 | void | |
212 | myresume (step, signo) | |
213 | int step; | |
214 | int signo; | |
215 | { | |
216 | /* Should be using target_signal_to_host() or signal numbers in target.h | |
217 | to convert GDB signal number to target signal number. */ | |
218 | sim_resume (step, signo); | |
219 | } | |
220 | ||
221 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
222 | to debugger memory starting at MYADDR. */ | |
223 | ||
224 | void | |
225 | read_inferior_memory (memaddr, myaddr, len) | |
226 | CORE_ADDR memaddr; | |
227 | char *myaddr; | |
228 | int len; | |
229 | { | |
230 | sim_read (memaddr, myaddr, len); | |
231 | } | |
232 | ||
233 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
234 | to inferior's memory at MEMADDR. | |
235 | On failure (cannot write the inferior) | |
236 | returns the value of errno. */ | |
237 | ||
238 | int | |
239 | write_inferior_memory (memaddr, myaddr, len) | |
240 | CORE_ADDR memaddr; | |
241 | char *myaddr; | |
242 | int len; | |
243 | { | |
244 | sim_write (memaddr, myaddr, len); /* should check for error. FIXME!! */ | |
245 | return 0; | |
246 | } | |
247 | ||
248 | #if 0 | |
249 | void | |
250 | initialize () | |
251 | { | |
252 | inferior_pid = 0; | |
253 | } | |
254 | ||
255 | int | |
256 | have_inferior_p () | |
257 | { | |
258 | return inferior_pid != 0; | |
259 | } | |
260 | #endif |