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252b5132 | 1 | /* This file defines the interface between the simulator and gdb. |
75c4388a | 2 | |
7b6bb8da JB |
3 | Copyright 1993, 1994, 1996, 1997, 1998, 2000, 2002, 2007, 2008, 2009, 2010, |
4 | 2011 Free Software Foundation, Inc. | |
252b5132 | 5 | |
1d52ba21 | 6 | This file is part of GDB. |
252b5132 | 7 | |
1d52ba21 JB |
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. | |
252b5132 | 12 | |
1d52ba21 JB |
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. | |
252b5132 | 17 | |
1d52ba21 JB |
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/>. */ | |
252b5132 RH |
20 | |
21 | #if !defined (REMOTE_SIM_H) | |
22 | #define REMOTE_SIM_H 1 | |
23 | ||
24 | #ifdef __cplusplus | |
25 | extern "C" { | |
26 | #endif | |
27 | ||
28 | /* This file is used when building stand-alone simulators, so isolate this | |
29 | file from gdb. */ | |
30 | ||
31 | /* Pick up CORE_ADDR_TYPE if defined (from gdb), otherwise use same value as | |
32 | gdb does (unsigned int - from defs.h). */ | |
33 | ||
34 | #ifndef CORE_ADDR_TYPE | |
35 | typedef unsigned int SIM_ADDR; | |
36 | #else | |
37 | typedef CORE_ADDR_TYPE SIM_ADDR; | |
38 | #endif | |
39 | ||
40 | ||
41 | /* Semi-opaque type used as result of sim_open and passed back to all | |
42 | other routines. "desc" is short for "descriptor". | |
43 | It is up to each simulator to define `sim_state'. */ | |
44 | ||
45 | typedef struct sim_state *SIM_DESC; | |
46 | ||
47 | ||
48 | /* Values for `kind' arg to sim_open. */ | |
49 | ||
50 | typedef enum { | |
51 | SIM_OPEN_STANDALONE, /* simulator used standalone (run.c) */ | |
52 | SIM_OPEN_DEBUG /* simulator used by debugger (gdb) */ | |
53 | } SIM_OPEN_KIND; | |
54 | ||
55 | ||
56 | /* Return codes from various functions. */ | |
57 | ||
58 | typedef enum { | |
59 | SIM_RC_FAIL = 0, | |
836cc9f4 | 60 | SIM_RC_OK = 1 |
252b5132 RH |
61 | } SIM_RC; |
62 | ||
63 | ||
64 | /* The bfd struct, as an opaque type. */ | |
65 | ||
113dd8b2 | 66 | struct bfd; |
252b5132 RH |
67 | |
68 | ||
69 | /* Main simulator entry points. */ | |
70 | ||
71 | ||
72 | /* Create a fully initialized simulator instance. | |
73 | ||
74 | (This function is called when the simulator is selected from the | |
75 | gdb command line.) | |
76 | ||
77 | KIND specifies how the simulator shall be used. Currently there | |
78 | are only two kinds: stand-alone and debug. | |
79 | ||
80 | CALLBACK specifies a standard host callback (defined in callback.h). | |
81 | ||
82 | ABFD, when non NULL, designates a target program. The program is | |
83 | not loaded. | |
84 | ||
85 | ARGV is a standard ARGV pointer such as that passed from the | |
86 | command line. The syntax of the argument list is is assumed to be | |
87 | ``SIM-PROG { SIM-OPTION } [ TARGET-PROGRAM { TARGET-OPTION } ]''. | |
88 | The trailing TARGET-PROGRAM and args are only valid for a | |
89 | stand-alone simulator. | |
90 | ||
91 | On success, the result is a non NULL descriptor that shall be | |
92 | passed to the other sim_foo functions. While the simulator | |
93 | configuration can be parameterized by (in decreasing precedence) | |
94 | ARGV's SIM-OPTION, ARGV's TARGET-PROGRAM and the ABFD argument, the | |
95 | successful creation of the simulator shall not dependent on the | |
96 | presence of any of these arguments/options. | |
97 | ||
98 | Hardware simulator: The created simulator shall be sufficiently | |
99 | initialized to handle, with out restrictions any client requests | |
100 | (including memory reads/writes, register fetch/stores and a | |
101 | resume). | |
102 | ||
103 | Process simulator: that process is not created until a call to | |
104 | sim_create_inferior. FIXME: What should the state of the simulator | |
105 | be? */ | |
106 | ||
6f2bc2ee | 107 | SIM_DESC sim_open (SIM_OPEN_KIND kind, struct host_callback_struct *callback, struct bfd *abfd, char **argv); |
252b5132 RH |
108 | |
109 | ||
110 | /* Destory a simulator instance. | |
111 | ||
112 | QUITTING is non-zero if we cannot hang on errors. | |
113 | ||
114 | This may involve freeing target memory and closing any open files | |
115 | and mmap'd areas. You cannot assume sim_kill has already been | |
116 | called. */ | |
117 | ||
6f2bc2ee | 118 | void sim_close (SIM_DESC sd, int quitting); |
252b5132 RH |
119 | |
120 | ||
121 | /* Load program PROG into the simulators memory. | |
122 | ||
123 | If ABFD is non-NULL, the bfd for the file has already been opened. | |
124 | The result is a return code indicating success. | |
125 | ||
126 | Hardware simulator: Normally, each program section is written into | |
127 | memory according to that sections LMA using physical (direct) | |
128 | addressing. The exception being systems, such as PPC/CHRP, which | |
129 | support more complicated program loaders. A call to this function | |
130 | should not effect the state of the processor registers. Multiple | |
131 | calls to this function are permitted and have an accumulative | |
132 | effect. | |
133 | ||
134 | Process simulator: Calls to this function may be ignored. | |
135 | ||
136 | FIXME: Most hardware simulators load the image at the VMA using | |
137 | virtual addressing. | |
138 | ||
139 | FIXME: For some hardware targets, before a loaded program can be | |
140 | executed, it requires the manipulation of VM registers and tables. | |
141 | Such manipulation should probably (?) occure in | |
142 | sim_create_inferior. */ | |
143 | ||
6f2bc2ee | 144 | SIM_RC sim_load (SIM_DESC sd, char *prog, struct bfd *abfd, int from_tty); |
252b5132 RH |
145 | |
146 | ||
147 | /* Prepare to run the simulated program. | |
148 | ||
149 | ABFD, if not NULL, provides initial processor state information. | |
150 | ARGV and ENV, if non NULL, are NULL terminated lists of pointers. | |
151 | ||
152 | Hardware simulator: This function shall initialize the processor | |
153 | registers to a known value. The program counter and possibly stack | |
154 | pointer shall be set using information obtained from ABFD (or | |
155 | hardware reset defaults). ARGV and ENV, dependant on the target | |
156 | ABI, may be written to memory. | |
157 | ||
158 | Process simulator: After a call to this function, a new process | |
159 | instance shall exist. The TEXT, DATA, BSS and stack regions shall | |
160 | all be initialized, ARGV and ENV shall be written to process | |
161 | address space (according to the applicable ABI) and the program | |
162 | counter and stack pointer set accordingly. */ | |
163 | ||
6f2bc2ee | 164 | SIM_RC sim_create_inferior (SIM_DESC sd, struct bfd *abfd, char **argv, char **env); |
252b5132 RH |
165 | |
166 | ||
167 | /* Fetch LENGTH bytes of the simulated program's memory. Start fetch | |
168 | at virtual address MEM and store in BUF. Result is number of bytes | |
169 | read, or zero if error. */ | |
170 | ||
6f2bc2ee | 171 | int sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length); |
252b5132 RH |
172 | |
173 | ||
174 | /* Store LENGTH bytes from BUF into the simulated program's | |
175 | memory. Store bytes starting at virtual address MEM. Result is | |
176 | number of bytes write, or zero if error. */ | |
177 | ||
6f2bc2ee | 178 | int sim_write (SIM_DESC sd, SIM_ADDR mem, const unsigned char *buf, int length); |
252b5132 RH |
179 | |
180 | ||
181 | /* Fetch register REGNO storing its raw (target endian) value in the | |
182 | LENGTH byte buffer BUF. Return the actual size of the register or | |
183 | zero if REGNO is not applicable. | |
184 | ||
185 | Legacy implementations ignore LENGTH and always return -1. | |
186 | ||
187 | If LENGTH does not match the size of REGNO no data is transfered | |
188 | (the actual register size is still returned). */ | |
189 | ||
6f2bc2ee | 190 | int sim_fetch_register (SIM_DESC sd, int regno, unsigned char *buf, int length); |
252b5132 RH |
191 | |
192 | ||
193 | /* Store register REGNO from the raw (target endian) value in BUF. | |
252b5132 | 194 | |
dae477fe AB |
195 | Return the actual size of the register, any size not equal to |
196 | LENGTH indicates the register was not updated correctly. | |
252b5132 | 197 | |
dae477fe AB |
198 | Return a LENGTH of -1 to indicate the register was not updated |
199 | and an error has occurred. | |
200 | ||
201 | Return a LENGTH of 0 to indicate the register was not updated | |
202 | but no error has occurred. */ | |
252b5132 | 203 | |
6f2bc2ee | 204 | int sim_store_register (SIM_DESC sd, int regno, unsigned char *buf, int length); |
252b5132 RH |
205 | |
206 | ||
207 | /* Print whatever statistics the simulator has collected. | |
208 | ||
209 | VERBOSE is currently unused and must always be zero. */ | |
210 | ||
6f2bc2ee | 211 | void sim_info (SIM_DESC sd, int verbose); |
252b5132 RH |
212 | |
213 | ||
c1a8de50 AC |
214 | /* Run (or resume) the simulated program. |
215 | ||
216 | STEP, when non-zero indicates that only a single simulator cycle | |
217 | should be emulated. | |
218 | ||
219 | SIGGNAL, if non-zero is a (HOST) SIGRC value indicating the type of | |
220 | event (hardware interrupt, signal) to be delivered to the simulated | |
221 | program. | |
222 | ||
223 | Hardware simulator: If the SIGRC value returned by | |
224 | sim_stop_reason() is passed back to the simulator via SIGGNAL then | |
225 | the hardware simulator shall correctly deliver the hardware event | |
226 | indicated by that signal. If a value of zero is passed in then the | |
227 | simulation will continue as if there were no outstanding signal. | |
228 | The effect of any other SIGGNAL value is is implementation | |
229 | dependant. | |
230 | ||
231 | Process simulator: If SIGRC is non-zero then the corresponding | |
232 | signal is delivered to the simulated program and execution is then | |
233 | continued. A zero SIGRC value indicates that the program should | |
234 | continue as normal. */ | |
252b5132 | 235 | |
6f2bc2ee | 236 | void sim_resume (SIM_DESC sd, int step, int siggnal); |
252b5132 RH |
237 | |
238 | ||
239 | /* Asynchronous request to stop the simulation. | |
240 | A nonzero return indicates that the simulator is able to handle | |
241 | the request */ | |
242 | ||
6f2bc2ee | 243 | int sim_stop (SIM_DESC sd); |
252b5132 RH |
244 | |
245 | ||
246 | /* Fetch the REASON why the program stopped. | |
247 | ||
248 | SIM_EXITED: The program has terminated. SIGRC indicates the target | |
249 | dependant exit status. | |
250 | ||
251 | SIM_STOPPED: The program has stopped. SIGRC uses the host's signal | |
252 | numbering as a way of identifying the reaon: program interrupted by | |
253 | user via a sim_stop request (SIGINT); a breakpoint instruction | |
254 | (SIGTRAP); a completed single step (SIGTRAP); an internal error | |
255 | condition (SIGABRT); an illegal instruction (SIGILL); Access to an | |
256 | undefined memory region (SIGSEGV); Mis-aligned memory access | |
c1a8de50 AC |
257 | (SIGBUS). For some signals information in addition to the signal |
258 | number may be retained by the simulator (e.g. offending address), | |
259 | that information is not directly accessable via this interface. | |
252b5132 | 260 | |
c1a8de50 AC |
261 | SIM_SIGNALLED: The program has been terminated by a signal. The |
262 | simulator has encountered target code that causes the the program | |
263 | to exit with signal SIGRC. | |
252b5132 RH |
264 | |
265 | SIM_RUNNING, SIM_POLLING: The return of one of these values | |
266 | indicates a problem internal to the simulator. */ | |
267 | ||
268 | enum sim_stop { sim_running, sim_polling, sim_exited, sim_stopped, sim_signalled }; | |
269 | ||
6f2bc2ee | 270 | void sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc); |
252b5132 RH |
271 | |
272 | ||
273 | /* Passthru for other commands that the simulator might support. | |
274 | Simulators should be prepared to deal with any combination of NULL | |
275 | or empty CMD. */ | |
276 | ||
6f2bc2ee | 277 | void sim_do_command (SIM_DESC sd, char *cmd); |
252b5132 | 278 | |
252b5132 RH |
279 | #ifdef __cplusplus |
280 | } | |
281 | #endif | |
282 | ||
283 | #endif /* !defined (REMOTE_SIM_H) */ |