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252b5132 | 1 | /* This file defines the interface between the simulator and gdb. |
75c4388a | 2 | |
fd67aa11 | 3 | Copyright (C) 1993-2024 Free Software Foundation, Inc. |
252b5132 | 4 | |
1d52ba21 | 5 | This file is part of GDB. |
252b5132 | 6 | |
1d52ba21 JB |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
252b5132 | 11 | |
1d52ba21 JB |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
252b5132 | 16 | |
1d52ba21 JB |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
252b5132 | 19 | |
df68e12b MF |
20 | #ifndef SIM_SIM_H |
21 | #define SIM_SIM_H 1 | |
252b5132 | 22 | |
cc67f780 | 23 | #include <stdbool.h> |
63fd5b5d MF |
24 | #include <stdint.h> |
25 | ||
252b5132 RH |
26 | #ifdef __cplusplus |
27 | extern "C" { | |
28 | #endif | |
29 | ||
252b5132 RH |
30 | /* Semi-opaque type used as result of sim_open and passed back to all |
31 | other routines. "desc" is short for "descriptor". | |
32 | It is up to each simulator to define `sim_state'. */ | |
33 | ||
34 | typedef struct sim_state *SIM_DESC; | |
35 | ||
36 | ||
37 | /* Values for `kind' arg to sim_open. */ | |
38 | ||
39 | typedef enum { | |
40 | SIM_OPEN_STANDALONE, /* simulator used standalone (run.c) */ | |
41 | SIM_OPEN_DEBUG /* simulator used by debugger (gdb) */ | |
42 | } SIM_OPEN_KIND; | |
43 | ||
44 | ||
45 | /* Return codes from various functions. */ | |
46 | ||
47 | typedef enum { | |
48 | SIM_RC_FAIL = 0, | |
836cc9f4 | 49 | SIM_RC_OK = 1 |
252b5132 RH |
50 | } SIM_RC; |
51 | ||
52 | ||
8406bb59 | 53 | /* Some structs, as opaque types. */ |
252b5132 | 54 | |
113dd8b2 | 55 | struct bfd; |
8406bb59 | 56 | struct host_callback_struct; |
252b5132 RH |
57 | |
58 | ||
59 | /* Main simulator entry points. */ | |
60 | ||
61 | ||
62 | /* Create a fully initialized simulator instance. | |
63 | ||
64 | (This function is called when the simulator is selected from the | |
65 | gdb command line.) | |
66 | ||
67 | KIND specifies how the simulator shall be used. Currently there | |
68 | are only two kinds: stand-alone and debug. | |
69 | ||
70 | CALLBACK specifies a standard host callback (defined in callback.h). | |
71 | ||
72 | ABFD, when non NULL, designates a target program. The program is | |
73 | not loaded. | |
74 | ||
75 | ARGV is a standard ARGV pointer such as that passed from the | |
76 | command line. The syntax of the argument list is is assumed to be | |
77 | ``SIM-PROG { SIM-OPTION } [ TARGET-PROGRAM { TARGET-OPTION } ]''. | |
78 | The trailing TARGET-PROGRAM and args are only valid for a | |
79 | stand-alone simulator. | |
80 | ||
81 | On success, the result is a non NULL descriptor that shall be | |
82 | passed to the other sim_foo functions. While the simulator | |
83 | configuration can be parameterized by (in decreasing precedence) | |
84 | ARGV's SIM-OPTION, ARGV's TARGET-PROGRAM and the ABFD argument, the | |
85 | successful creation of the simulator shall not dependent on the | |
86 | presence of any of these arguments/options. | |
87 | ||
88 | Hardware simulator: The created simulator shall be sufficiently | |
89 | initialized to handle, with out restrictions any client requests | |
90 | (including memory reads/writes, register fetch/stores and a | |
91 | resume). | |
92 | ||
93 | Process simulator: that process is not created until a call to | |
94 | sim_create_inferior. FIXME: What should the state of the simulator | |
95 | be? */ | |
96 | ||
2e3d4f4d MF |
97 | SIM_DESC sim_open (SIM_OPEN_KIND kind, struct host_callback_struct *callback, |
98 | struct bfd *abfd, char * const *argv); | |
252b5132 RH |
99 | |
100 | ||
101 | /* Destory a simulator instance. | |
102 | ||
103 | QUITTING is non-zero if we cannot hang on errors. | |
104 | ||
105 | This may involve freeing target memory and closing any open files | |
106 | and mmap'd areas. You cannot assume sim_kill has already been | |
107 | called. */ | |
108 | ||
6f2bc2ee | 109 | void sim_close (SIM_DESC sd, int quitting); |
252b5132 RH |
110 | |
111 | ||
112 | /* Load program PROG into the simulators memory. | |
113 | ||
114 | If ABFD is non-NULL, the bfd for the file has already been opened. | |
115 | The result is a return code indicating success. | |
116 | ||
117 | Hardware simulator: Normally, each program section is written into | |
118 | memory according to that sections LMA using physical (direct) | |
119 | addressing. The exception being systems, such as PPC/CHRP, which | |
120 | support more complicated program loaders. A call to this function | |
121 | should not effect the state of the processor registers. Multiple | |
122 | calls to this function are permitted and have an accumulative | |
123 | effect. | |
124 | ||
125 | Process simulator: Calls to this function may be ignored. | |
126 | ||
127 | FIXME: Most hardware simulators load the image at the VMA using | |
128 | virtual addressing. | |
129 | ||
130 | FIXME: For some hardware targets, before a loaded program can be | |
131 | executed, it requires the manipulation of VM registers and tables. | |
132 | Such manipulation should probably (?) occure in | |
133 | sim_create_inferior. */ | |
134 | ||
b2b255bd | 135 | SIM_RC sim_load (SIM_DESC sd, const char *prog, struct bfd *abfd, int from_tty); |
252b5132 RH |
136 | |
137 | ||
138 | /* Prepare to run the simulated program. | |
139 | ||
140 | ABFD, if not NULL, provides initial processor state information. | |
141 | ARGV and ENV, if non NULL, are NULL terminated lists of pointers. | |
142 | ||
143 | Hardware simulator: This function shall initialize the processor | |
144 | registers to a known value. The program counter and possibly stack | |
145 | pointer shall be set using information obtained from ABFD (or | |
146 | hardware reset defaults). ARGV and ENV, dependant on the target | |
147 | ABI, may be written to memory. | |
148 | ||
149 | Process simulator: After a call to this function, a new process | |
150 | instance shall exist. The TEXT, DATA, BSS and stack regions shall | |
151 | all be initialized, ARGV and ENV shall be written to process | |
152 | address space (according to the applicable ABI) and the program | |
153 | counter and stack pointer set accordingly. */ | |
154 | ||
2e3d4f4d MF |
155 | SIM_RC sim_create_inferior (SIM_DESC sd, struct bfd *abfd, |
156 | char * const *argv, char * const *env); | |
252b5132 RH |
157 | |
158 | ||
159 | /* Fetch LENGTH bytes of the simulated program's memory. Start fetch | |
160 | at virtual address MEM and store in BUF. Result is number of bytes | |
161 | read, or zero if error. */ | |
162 | ||
63fd5b5d | 163 | uint64_t sim_read (SIM_DESC sd, uint64_t mem, void *buf, uint64_t length); |
252b5132 RH |
164 | |
165 | ||
166 | /* Store LENGTH bytes from BUF into the simulated program's | |
167 | memory. Store bytes starting at virtual address MEM. Result is | |
168 | number of bytes write, or zero if error. */ | |
169 | ||
63fd5b5d | 170 | uint64_t sim_write (SIM_DESC sd, uint64_t mem, const void *buf, uint64_t length); |
252b5132 RH |
171 | |
172 | ||
173 | /* Fetch register REGNO storing its raw (target endian) value in the | |
174 | LENGTH byte buffer BUF. Return the actual size of the register or | |
175 | zero if REGNO is not applicable. | |
176 | ||
177 | Legacy implementations ignore LENGTH and always return -1. | |
178 | ||
179 | If LENGTH does not match the size of REGNO no data is transfered | |
180 | (the actual register size is still returned). */ | |
181 | ||
ee1cffd3 | 182 | int sim_fetch_register (SIM_DESC sd, int regno, void *buf, int length); |
252b5132 RH |
183 | |
184 | ||
185 | /* Store register REGNO from the raw (target endian) value in BUF. | |
252b5132 | 186 | |
dae477fe AB |
187 | Return the actual size of the register, any size not equal to |
188 | LENGTH indicates the register was not updated correctly. | |
252b5132 | 189 | |
dae477fe AB |
190 | Return a LENGTH of -1 to indicate the register was not updated |
191 | and an error has occurred. | |
192 | ||
193 | Return a LENGTH of 0 to indicate the register was not updated | |
194 | but no error has occurred. */ | |
252b5132 | 195 | |
ee1cffd3 | 196 | int sim_store_register (SIM_DESC sd, int regno, const void *buf, int length); |
252b5132 RH |
197 | |
198 | ||
199 | /* Print whatever statistics the simulator has collected. | |
200 | ||
cc67f780 | 201 | When VERBOSE is enabled, extra details will be shown. */ |
252b5132 | 202 | |
cc67f780 | 203 | void sim_info (SIM_DESC sd, bool verbose); |
252b5132 RH |
204 | |
205 | ||
e904f56d MF |
206 | /* Return a memory map in XML format. |
207 | ||
208 | The caller must free the returned string. | |
209 | ||
210 | For details on the format, see GDB's Memory Map Format documentation. */ | |
211 | ||
212 | char *sim_memory_map (SIM_DESC sd); | |
213 | ||
214 | ||
c1a8de50 AC |
215 | /* Run (or resume) the simulated program. |
216 | ||
217 | STEP, when non-zero indicates that only a single simulator cycle | |
218 | should be emulated. | |
219 | ||
220 | SIGGNAL, if non-zero is a (HOST) SIGRC value indicating the type of | |
221 | event (hardware interrupt, signal) to be delivered to the simulated | |
222 | program. | |
223 | ||
224 | Hardware simulator: If the SIGRC value returned by | |
225 | sim_stop_reason() is passed back to the simulator via SIGGNAL then | |
226 | the hardware simulator shall correctly deliver the hardware event | |
227 | indicated by that signal. If a value of zero is passed in then the | |
228 | simulation will continue as if there were no outstanding signal. | |
229 | The effect of any other SIGGNAL value is is implementation | |
230 | dependant. | |
231 | ||
232 | Process simulator: If SIGRC is non-zero then the corresponding | |
233 | signal is delivered to the simulated program and execution is then | |
234 | continued. A zero SIGRC value indicates that the program should | |
235 | continue as normal. */ | |
252b5132 | 236 | |
6f2bc2ee | 237 | void sim_resume (SIM_DESC sd, int step, int siggnal); |
252b5132 RH |
238 | |
239 | ||
240 | /* Asynchronous request to stop the simulation. | |
241 | A nonzero return indicates that the simulator is able to handle | |
242 | the request */ | |
243 | ||
6f2bc2ee | 244 | int sim_stop (SIM_DESC sd); |
252b5132 RH |
245 | |
246 | ||
247 | /* Fetch the REASON why the program stopped. | |
248 | ||
249 | SIM_EXITED: The program has terminated. SIGRC indicates the target | |
250 | dependant exit status. | |
251 | ||
252 | SIM_STOPPED: The program has stopped. SIGRC uses the host's signal | |
253 | numbering as a way of identifying the reaon: program interrupted by | |
254 | user via a sim_stop request (SIGINT); a breakpoint instruction | |
255 | (SIGTRAP); a completed single step (SIGTRAP); an internal error | |
256 | condition (SIGABRT); an illegal instruction (SIGILL); Access to an | |
257 | undefined memory region (SIGSEGV); Mis-aligned memory access | |
c1a8de50 AC |
258 | (SIGBUS). For some signals information in addition to the signal |
259 | number may be retained by the simulator (e.g. offending address), | |
260 | that information is not directly accessable via this interface. | |
252b5132 | 261 | |
c1a8de50 | 262 | SIM_SIGNALLED: The program has been terminated by a signal. The |
de194d85 | 263 | simulator has encountered target code that causes the program |
c1a8de50 | 264 | to exit with signal SIGRC. |
252b5132 RH |
265 | |
266 | SIM_RUNNING, SIM_POLLING: The return of one of these values | |
267 | indicates a problem internal to the simulator. */ | |
268 | ||
269 | enum sim_stop { sim_running, sim_polling, sim_exited, sim_stopped, sim_signalled }; | |
270 | ||
6f2bc2ee | 271 | void sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc); |
252b5132 RH |
272 | |
273 | ||
274 | /* Passthru for other commands that the simulator might support. | |
275 | Simulators should be prepared to deal with any combination of NULL | |
276 | or empty CMD. */ | |
277 | ||
60d847df | 278 | void sim_do_command (SIM_DESC sd, const char *cmd); |
252b5132 | 279 | |
56a9aa1d MF |
280 | /* Complete a command based on the available sim commands. Returns an |
281 | array of possible matches. */ | |
5592f70e | 282 | |
3cb2ab1a | 283 | char **sim_complete_command (SIM_DESC sd, const char *text, const char *word); |
56a9aa1d | 284 | |
252b5132 RH |
285 | #ifdef __cplusplus |
286 | } | |
287 | #endif | |
288 | ||
df68e12b | 289 | #endif /* !defined (SIM_SIM_H) */ |