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252b5132 | 1 | /* This file defines the interface between the simulator and gdb. |
75c4388a AC |
2 | |
3 | Copyright 1993, 1994, 1996, 1997, 1998, 2000, 2002 Free Software | |
4 | Foundation, Inc. | |
252b5132 RH |
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 2 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, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #if !defined (REMOTE_SIM_H) | |
23 | #define REMOTE_SIM_H 1 | |
24 | ||
25 | #ifdef __cplusplus | |
26 | extern "C" { | |
27 | #endif | |
28 | ||
29 | /* This file is used when building stand-alone simulators, so isolate this | |
30 | file from gdb. */ | |
31 | ||
32 | /* Pick up CORE_ADDR_TYPE if defined (from gdb), otherwise use same value as | |
33 | gdb does (unsigned int - from defs.h). */ | |
34 | ||
35 | #ifndef CORE_ADDR_TYPE | |
36 | typedef unsigned int SIM_ADDR; | |
37 | #else | |
38 | typedef CORE_ADDR_TYPE SIM_ADDR; | |
39 | #endif | |
40 | ||
41 | ||
42 | /* Semi-opaque type used as result of sim_open and passed back to all | |
43 | other routines. "desc" is short for "descriptor". | |
44 | It is up to each simulator to define `sim_state'. */ | |
45 | ||
46 | typedef struct sim_state *SIM_DESC; | |
47 | ||
48 | ||
49 | /* Values for `kind' arg to sim_open. */ | |
50 | ||
51 | typedef enum { | |
52 | SIM_OPEN_STANDALONE, /* simulator used standalone (run.c) */ | |
53 | SIM_OPEN_DEBUG /* simulator used by debugger (gdb) */ | |
54 | } SIM_OPEN_KIND; | |
55 | ||
56 | ||
57 | /* Return codes from various functions. */ | |
58 | ||
59 | typedef enum { | |
60 | SIM_RC_FAIL = 0, | |
836cc9f4 | 61 | SIM_RC_OK = 1 |
252b5132 RH |
62 | } SIM_RC; |
63 | ||
64 | ||
65 | /* The bfd struct, as an opaque type. */ | |
66 | ||
67 | struct _bfd; | |
68 | ||
69 | ||
70 | /* Main simulator entry points. */ | |
71 | ||
72 | ||
73 | /* Create a fully initialized simulator instance. | |
74 | ||
75 | (This function is called when the simulator is selected from the | |
76 | gdb command line.) | |
77 | ||
78 | KIND specifies how the simulator shall be used. Currently there | |
79 | are only two kinds: stand-alone and debug. | |
80 | ||
81 | CALLBACK specifies a standard host callback (defined in callback.h). | |
82 | ||
83 | ABFD, when non NULL, designates a target program. The program is | |
84 | not loaded. | |
85 | ||
86 | ARGV is a standard ARGV pointer such as that passed from the | |
87 | command line. The syntax of the argument list is is assumed to be | |
88 | ``SIM-PROG { SIM-OPTION } [ TARGET-PROGRAM { TARGET-OPTION } ]''. | |
89 | The trailing TARGET-PROGRAM and args are only valid for a | |
90 | stand-alone simulator. | |
91 | ||
92 | On success, the result is a non NULL descriptor that shall be | |
93 | passed to the other sim_foo functions. While the simulator | |
94 | configuration can be parameterized by (in decreasing precedence) | |
95 | ARGV's SIM-OPTION, ARGV's TARGET-PROGRAM and the ABFD argument, the | |
96 | successful creation of the simulator shall not dependent on the | |
97 | presence of any of these arguments/options. | |
98 | ||
99 | Hardware simulator: The created simulator shall be sufficiently | |
100 | initialized to handle, with out restrictions any client requests | |
101 | (including memory reads/writes, register fetch/stores and a | |
102 | resume). | |
103 | ||
104 | Process simulator: that process is not created until a call to | |
105 | sim_create_inferior. FIXME: What should the state of the simulator | |
106 | be? */ | |
107 | ||
108 | SIM_DESC sim_open PARAMS ((SIM_OPEN_KIND kind, struct host_callback_struct *callback, struct _bfd *abfd, char **argv)); | |
109 | ||
110 | ||
111 | /* Destory a simulator instance. | |
112 | ||
113 | QUITTING is non-zero if we cannot hang on errors. | |
114 | ||
115 | This may involve freeing target memory and closing any open files | |
116 | and mmap'd areas. You cannot assume sim_kill has already been | |
117 | called. */ | |
118 | ||
119 | void sim_close PARAMS ((SIM_DESC sd, int quitting)); | |
120 | ||
121 | ||
122 | /* Load program PROG into the simulators memory. | |
123 | ||
124 | If ABFD is non-NULL, the bfd for the file has already been opened. | |
125 | The result is a return code indicating success. | |
126 | ||
127 | Hardware simulator: Normally, each program section is written into | |
128 | memory according to that sections LMA using physical (direct) | |
129 | addressing. The exception being systems, such as PPC/CHRP, which | |
130 | support more complicated program loaders. A call to this function | |
131 | should not effect the state of the processor registers. Multiple | |
132 | calls to this function are permitted and have an accumulative | |
133 | effect. | |
134 | ||
135 | Process simulator: Calls to this function may be ignored. | |
136 | ||
137 | FIXME: Most hardware simulators load the image at the VMA using | |
138 | virtual addressing. | |
139 | ||
140 | FIXME: For some hardware targets, before a loaded program can be | |
141 | executed, it requires the manipulation of VM registers and tables. | |
142 | Such manipulation should probably (?) occure in | |
143 | sim_create_inferior. */ | |
144 | ||
145 | SIM_RC sim_load PARAMS ((SIM_DESC sd, char *prog, struct _bfd *abfd, int from_tty)); | |
146 | ||
147 | ||
148 | /* Prepare to run the simulated program. | |
149 | ||
150 | ABFD, if not NULL, provides initial processor state information. | |
151 | ARGV and ENV, if non NULL, are NULL terminated lists of pointers. | |
152 | ||
153 | Hardware simulator: This function shall initialize the processor | |
154 | registers to a known value. The program counter and possibly stack | |
155 | pointer shall be set using information obtained from ABFD (or | |
156 | hardware reset defaults). ARGV and ENV, dependant on the target | |
157 | ABI, may be written to memory. | |
158 | ||
159 | Process simulator: After a call to this function, a new process | |
160 | instance shall exist. The TEXT, DATA, BSS and stack regions shall | |
161 | all be initialized, ARGV and ENV shall be written to process | |
162 | address space (according to the applicable ABI) and the program | |
163 | counter and stack pointer set accordingly. */ | |
164 | ||
165 | SIM_RC sim_create_inferior PARAMS ((SIM_DESC sd, struct _bfd *abfd, char **argv, char **env)); | |
166 | ||
167 | ||
168 | /* Fetch LENGTH bytes of the simulated program's memory. Start fetch | |
169 | at virtual address MEM and store in BUF. Result is number of bytes | |
170 | read, or zero if error. */ | |
171 | ||
172 | int sim_read PARAMS ((SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)); | |
173 | ||
174 | ||
175 | /* Store LENGTH bytes from BUF into the simulated program's | |
176 | memory. Store bytes starting at virtual address MEM. Result is | |
177 | number of bytes write, or zero if error. */ | |
178 | ||
179 | int sim_write PARAMS ((SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)); | |
180 | ||
181 | ||
182 | /* Fetch register REGNO storing its raw (target endian) value in the | |
183 | LENGTH byte buffer BUF. Return the actual size of the register or | |
184 | zero if REGNO is not applicable. | |
185 | ||
186 | Legacy implementations ignore LENGTH and always return -1. | |
187 | ||
188 | If LENGTH does not match the size of REGNO no data is transfered | |
189 | (the actual register size is still returned). */ | |
190 | ||
191 | int sim_fetch_register PARAMS ((SIM_DESC sd, int regno, unsigned char *buf, int length)); | |
192 | ||
193 | ||
194 | /* Store register REGNO from the raw (target endian) value in BUF. | |
195 | Return the actual size of the register or zero if REGNO is not | |
196 | applicable. | |
197 | ||
198 | Legacy implementations ignore LENGTH and always return -1. | |
199 | ||
200 | If LENGTH does not match the size of REGNO no data is transfered | |
201 | (the actual register size is still returned). */ | |
202 | ||
203 | int sim_store_register PARAMS ((SIM_DESC sd, int regno, unsigned char *buf, int length)); | |
204 | ||
205 | ||
206 | /* Print whatever statistics the simulator has collected. | |
207 | ||
208 | VERBOSE is currently unused and must always be zero. */ | |
209 | ||
210 | void sim_info PARAMS ((SIM_DESC sd, int verbose)); | |
211 | ||
212 | ||
c1a8de50 AC |
213 | /* Run (or resume) the simulated program. |
214 | ||
215 | STEP, when non-zero indicates that only a single simulator cycle | |
216 | should be emulated. | |
217 | ||
218 | SIGGNAL, if non-zero is a (HOST) SIGRC value indicating the type of | |
219 | event (hardware interrupt, signal) to be delivered to the simulated | |
220 | program. | |
221 | ||
222 | Hardware simulator: If the SIGRC value returned by | |
223 | sim_stop_reason() is passed back to the simulator via SIGGNAL then | |
224 | the hardware simulator shall correctly deliver the hardware event | |
225 | indicated by that signal. If a value of zero is passed in then the | |
226 | simulation will continue as if there were no outstanding signal. | |
227 | The effect of any other SIGGNAL value is is implementation | |
228 | dependant. | |
229 | ||
230 | Process simulator: If SIGRC is non-zero then the corresponding | |
231 | signal is delivered to the simulated program and execution is then | |
232 | continued. A zero SIGRC value indicates that the program should | |
233 | continue as normal. */ | |
252b5132 RH |
234 | |
235 | void sim_resume PARAMS ((SIM_DESC sd, int step, int siggnal)); | |
236 | ||
237 | ||
238 | /* Asynchronous request to stop the simulation. | |
239 | A nonzero return indicates that the simulator is able to handle | |
240 | the request */ | |
241 | ||
242 | int sim_stop PARAMS ((SIM_DESC sd)); | |
243 | ||
244 | ||
245 | /* Fetch the REASON why the program stopped. | |
246 | ||
247 | SIM_EXITED: The program has terminated. SIGRC indicates the target | |
248 | dependant exit status. | |
249 | ||
250 | SIM_STOPPED: The program has stopped. SIGRC uses the host's signal | |
251 | numbering as a way of identifying the reaon: program interrupted by | |
252 | user via a sim_stop request (SIGINT); a breakpoint instruction | |
253 | (SIGTRAP); a completed single step (SIGTRAP); an internal error | |
254 | condition (SIGABRT); an illegal instruction (SIGILL); Access to an | |
255 | undefined memory region (SIGSEGV); Mis-aligned memory access | |
c1a8de50 AC |
256 | (SIGBUS). For some signals information in addition to the signal |
257 | number may be retained by the simulator (e.g. offending address), | |
258 | that information is not directly accessable via this interface. | |
252b5132 | 259 | |
c1a8de50 AC |
260 | SIM_SIGNALLED: The program has been terminated by a signal. The |
261 | simulator has encountered target code that causes the the program | |
262 | to exit with signal SIGRC. | |
252b5132 RH |
263 | |
264 | SIM_RUNNING, SIM_POLLING: The return of one of these values | |
265 | indicates a problem internal to the simulator. */ | |
266 | ||
267 | enum sim_stop { sim_running, sim_polling, sim_exited, sim_stopped, sim_signalled }; | |
268 | ||
269 | void sim_stop_reason PARAMS ((SIM_DESC sd, enum sim_stop *reason, int *sigrc)); | |
270 | ||
271 | ||
272 | /* Passthru for other commands that the simulator might support. | |
273 | Simulators should be prepared to deal with any combination of NULL | |
274 | or empty CMD. */ | |
275 | ||
276 | void sim_do_command PARAMS ((SIM_DESC sd, char *cmd)); | |
277 | ||
252b5132 RH |
278 | #ifdef __cplusplus |
279 | } | |
280 | #endif | |
281 | ||
282 | #endif /* !defined (REMOTE_SIM_H) */ |