include/remote-sim.h

   1 /* This file defines the interface between the simulator and gdb.
   2    Copyright (C) 1993, 1994, 1996, 1997 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 #if !defined (REMOTE_SIM_H)
  21 #define REMOTE_SIM_H 1
  22
  23 #ifdef __cplusplus
  24 extern "C" {
  25 #endif
  26
  27 /* This file is used when building stand-alone simulators, so isolate this
  28    file from gdb.  */
  29
  30 /* Pick up CORE_ADDR_TYPE if defined (from gdb), otherwise use same value as
  31    gdb does (unsigned int - from defs.h).  */
  32
  33 #ifndef CORE_ADDR_TYPE
  34 typedef unsigned int SIM_ADDR;
  35 #else
  36 typedef CORE_ADDR_TYPE SIM_ADDR;
  37 #endif
  38
  39
  40 /* Semi-opaque type used as result of sim_open and passed back to all
  41    other routines.  "desc" is short for "descriptor".
  42    It is up to each simulator to define `sim_state'.  */
  43
  44 typedef struct sim_state *SIM_DESC;
  45
  46
  47 /* Values for `kind' arg to sim_open.  */
  48
  49 typedef enum {
  50   SIM_OPEN_STANDALONE, /* simulator used standalone (run.c) */
  51   SIM_OPEN_DEBUG       /* simulator used by debugger (gdb) */
  52 } SIM_OPEN_KIND;
  53
  54
  55 /* Return codes from various functions.  */
  56
  57 typedef enum {
  58   SIM_RC_FAIL = 0,
  59   SIM_RC_OK = 1,
  60   SIM_RC_UNKNOWN_BREAKPOINT = 2,
  61   SIM_RC_INSUFFICIENT_RESOURCES = 3,
  62   SIM_RC_DUPLICATE_BREAKPOINT = 4
  63 } SIM_RC;
  64
  65
  66 /* The bfd struct, as an opaque type.  */
  67
  68 struct _bfd;
  69
  70
  71 /* Main simulator entry points.  */
  72
  73
  74 /* Create a fully initialized simulator instance.
  75
  76    (This function is called when the simulator is selected from the
  77    gdb command line.)
  78
  79    KIND specifies how the simulator shall be used.  Currently there
  80    are only two kinds: stand-alone and debug.
  81
  82    CALLBACK specifies a standard host callback (defined in callback.h).
  83
  84    ABFD, when non NULL, designates a target program.  The program is
  85    not loaded.
  86
  87    ARGV is a standard ARGV pointer such as that passed from the
  88    command line.  The syntax of the argument list is is assumed to be
  89    ``SIM-PROG { SIM-OPTION } [ TARGET-PROGRAM { TARGET-OPTION } ]''.
  90    The trailing TARGET-PROGRAM and args are only valid for a
  91    stand-alone simulator.
  92
  93    On success, the result is a non NULL descriptor that shall be
  94    passed to the other sim_foo functions.  While the simulator
  95    configuration can be parameterized by (in decreasing precedence)
  96    ARGV's SIM-OPTION, ARGV's TARGET-PROGRAM and the ABFD argument, the
  97    successful creation of the simulator shall not dependent on the
  98    presence of any of these arguments/options.
  99
 100    Hardware simulator: The created simulator shall be sufficiently
 101    initialized to handle, with out restrictions any client requests
 102    (including memory reads/writes, register fetch/stores and a
 103    resume).
 104
 105    Process simulator: that process is not created until a call to
 106    sim_create_inferior.  FIXME: What should the state of the simulator
 107    be? */
 108
 109 SIM_DESC sim_open PARAMS ((SIM_OPEN_KIND kind, struct host_callback_struct *callback, struct _bfd *abfd, char **argv));
 110
 111
 112 /* Destory a simulator instance.
 113
 114    QUITTING is non-zero if we cannot hang on errors.
 115
 116    This may involve freeing target memory and closing any open files
 117    and mmap'd areas.  You cannot assume sim_kill has already been
 118    called. */
 119
 120 void sim_close PARAMS ((SIM_DESC sd, int quitting));
 121
 122
 123 /* Load program PROG into the simulators memory.
 124
 125    If ABFD is non-NULL, the bfd for the file has already been opened.
 126    The result is a return code indicating success.
 127
 128    Hardware simulator: Normally, each program section is written into
 129    memory according to that sections LMA using physical (direct)
 130    addressing.  The exception being systems, such as PPC/CHRP, which
 131    support more complicated program loaders.  A call to this function
 132    should not effect the state of the processor registers.  Multiple
 133    calls to this function are permitted and have an accumulative
 134    effect.
 135
 136    Process simulator: Calls to this function may be ignored.
 137
 138    FIXME: Most hardware simulators load the image at the VMA using
 139    virtual addressing.
 140
 141    FIXME: For some hardware targets, before a loaded program can be
 142    executed, it requires the manipulation of VM registers and tables.
 143    Such manipulation should probably (?) occure in
 144    sim_create_inferior. */
 145
 146 SIM_RC sim_load PARAMS ((SIM_DESC sd, char *prog, struct _bfd *abfd, int from_tty));
 147
 148
 149 /* Prepare to run the simulated program.
 150
 151    ABFD, if not NULL, provides initial processor state information.
 152    ARGV and ENV, if non NULL, are NULL terminated lists of pointers.
 153
 154    Hardware simulator: This function shall initialize the processor
 155    registers to a known value.  The program counter and possibly stack
 156    pointer shall be set using information obtained from ABFD (or
 157    hardware reset defaults).  ARGV and ENV, dependant on the target
 158    ABI, may be written to memory.
 159
 160    Process simulator: After a call to this function, a new process
 161    instance shall exist. The TEXT, DATA, BSS and stack regions shall
 162    all be initialized, ARGV and ENV shall be written to process
 163    address space (according to the applicable ABI) and the program
 164    counter and stack pointer set accordingly. */
 165
 166 SIM_RC sim_create_inferior PARAMS ((SIM_DESC sd, struct _bfd *abfd, char **argv, char **env));
 167
 168
 169 /* Fetch LENGTH bytes of the simulated program's memory.  Start fetch
 170    at virtual address MEM and store in BUF.  Result is number of bytes
 171    read, or zero if error.  */
 172
 173 int sim_read PARAMS ((SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length));
 174
 175
 176 /* Store LENGTH bytes from BUF into the simulated program's
 177    memory. Store bytes starting at virtual address MEM. Result is
 178    number of bytes write, or zero if error.  */
 179
 180 int sim_write PARAMS ((SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length));
 181
 182
 183 /* Fetch register REGNO storing its raw (target endian) value in the
 184    LENGTH byte buffer BUF.  Return the actual size of the register or
 185    zero if REGNO is not applicable.
 186
 187    Legacy implementations ignore LENGTH and always return -1.
 188
 189    If LENGTH does not match the size of REGNO no data is transfered
 190    (the actual register size is still returned). */
 191
 192 int sim_fetch_register PARAMS ((SIM_DESC sd, int regno, unsigned char *buf, int length));
 193
 194
 195 /* Store register REGNO from the raw (target endian) value in BUF.
 196    Return the actual size of the register or zero if REGNO is not
 197    applicable.
 198
 199    Legacy implementations ignore LENGTH and always return -1.
 200
 201    If LENGTH does not match the size of REGNO no data is transfered
 202    (the actual register size is still returned). */
 203
 204 int sim_store_register PARAMS ((SIM_DESC sd, int regno, unsigned char *buf, int length));
 205
 206
 207 /* Print whatever statistics the simulator has collected.
 208
 209    VERBOSE is currently unused and must always be zero.  */
 210
 211 void sim_info PARAMS ((SIM_DESC sd, int verbose));
 212
 213
 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. */
 235
 236 void sim_resume PARAMS ((SIM_DESC sd, int step, int siggnal));
 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
 243 int sim_stop PARAMS ((SIM_DESC sd));
 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
 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.
 260
 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.
 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
 270 void sim_stop_reason PARAMS ((SIM_DESC sd, enum sim_stop *reason, int *sigrc));
 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
 277 void sim_do_command PARAMS ((SIM_DESC sd, char *cmd));
 278
 279 /* Call these functions to set and clear breakpoints at ADDR. */
 280
 281 SIM_RC sim_set_breakpoint PARAMS ((SIM_DESC sd, SIM_ADDR addr));
 282 SIM_RC sim_clear_breakpoint PARAMS ((SIM_DESC sd, SIM_ADDR addr));
 283 SIM_RC sim_clear_all_breakpoints PARAMS ((SIM_DESC sd));
 284
 285 /* These functions are used to enable and disable breakpoints. */
 286
 287 SIM_RC sim_enable_breakpoint PARAMS ((SIM_DESC sd, SIM_ADDR addr));
 288 SIM_RC sim_disable_breakpoint PARAMS ((SIM_DESC sd, SIM_ADDR addr));
 289 SIM_RC sim_enable_all_breakpoints PARAMS ((SIM_DESC sd));
 290 SIM_RC sim_disable_all_breakpoints PARAMS ((SIM_DESC sd));
 291 \f
 292
 293 /* Provide simulator with a default (global) host_callback_struct.
 294    THIS PROCEDURE IS DEPRECIATED.
 295    GDB and NRUN do not use this interface.
 296    This procedure does not take a SIM_DESC argument as it is
 297    used before sim_open. */
 298
 299 void sim_set_callbacks PARAMS ((struct host_callback_struct *));
 300
 301
 302 /* Set the size of the simulator memory array.
 303    THIS PROCEDURE IS DEPRECIATED.
 304    GDB and NRUN do not use this interface.
 305    This procedure does not take a SIM_DESC argument as it is
 306    used before sim_open. */
 307
 308 void sim_size PARAMS ((int i));
 309
 310
 311 /* Single-step simulator with tracing enabled.
 312    THIS PROCEDURE IS DEPRECIATED.
 313    THIS PROCEDURE IS EVEN MORE DEPRECATED THAN SIM_SET_TRACE
 314    GDB and NRUN do not use this interface.
 315    This procedure returns: ``0'' indicating that the simulator should
 316    be continued using sim_trace() calls; ``1'' indicating that the
 317    simulation has finished. */
 318
 319 int sim_trace PARAMS ((SIM_DESC sd));
 320
 321
 322 /* Enable tracing.
 323    THIS PROCEDURE IS DEPRECIATED.
 324    GDB and NRUN do not use this interface.
 325    This procedure returns: ``0'' indicating that the simulator should
 326    be continued using sim_trace() calls; ``1'' indicating that the
 327    simulation has finished. */
 328
 329 void sim_set_trace PARAMS ((void));
 330
 331
 332 /* Configure the size of the profile buffer.
 333    THIS PROCEDURE IS DEPRECIATED.
 334    GDB and NRUN do not use this interface.
 335    This procedure does not take a SIM_DESC argument as it is
 336    used before sim_open. */
 337
 338 void sim_set_profile_size PARAMS ((int n));
 339
 340
 341 /* Kill the running program.
 342    THIS PROCEDURE IS DEPRECIATED.
 343    GDB and NRUN do not use this interface.
 344    This procedure will be replaced as part of the introduction of
 345    multi-cpu simulators. */
 346
 347 void sim_kill PARAMS ((SIM_DESC sd));
 348
 349 #ifdef __cplusplus
 350 }
 351 #endif
 352
 353 #endif /* !defined (REMOTE_SIM_H) */