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 and store the raw (target endian) value in
 184    BUF.  */
 185
 186 void sim_fetch_register PARAMS ((SIM_DESC sd, int regno, unsigned char *buf));
 187
 188
 189 /* Store register REGNO from the raw (target endian) value in BUF.  */
 190
 191 void sim_store_register PARAMS ((SIM_DESC sd, int regno, unsigned char *buf));
 192
 193
 194 /* Print whatever statistics the simulator has collected.
 195
 196    VERBOSE is currently unused and must always be zero.  */
 197
 198 void sim_info PARAMS ((SIM_DESC sd, int verbose));
 199
 200
 201 /* Run (or resume) the simulated program.  */
 202
 203 void sim_resume PARAMS ((SIM_DESC sd, int step, int siggnal));
 204
 205
 206 /* Asynchronous request to stop the simulation.
 207    A nonzero return indicates that the simulator is able to handle
 208    the request */
 209
 210 int sim_stop PARAMS ((SIM_DESC sd));
 211
 212
 213 /* Fetch the REASON why the program stopped.
 214
 215    SIM_EXITED: The program has terminated. SIGRC indicates the target
 216    dependant exit status.
 217
 218    SIM_STOPPED: The program has stopped.  SIGRC uses the host's signal
 219    numbering as a way of identifying the reaon: program interrupted by
 220    user via a sim_stop request (SIGINT); a breakpoint instruction
 221    (SIGTRAP); a completed single step (SIGTRAP); an internal error
 222    condition (SIGABRT); an illegal instruction (SIGILL); Access to an
 223    undefined memory region (SIGSEGV); Mis-aligned memory access
 224    (SIGBUS).
 225
 226    SIM_SIGNALLED: The program has stopped. The simulator has
 227    encountered target code that requires the (HOST) signal SIGRC to be
 228    delivered to the simulated program.  Ex: `kill (getpid (),
 229    TARGET_SIGxxx)'.  Where TARGET_SIGxxx has been translated into a
 230    host signal.  FIXME: This is not always possible..
 231
 232    SIM_RUNNING, SIM_POLLING: The return of one of these values
 233    indicates a problem internal to the simulator. */
 234
 235 enum sim_stop { sim_running, sim_polling, sim_exited, sim_stopped, sim_signalled };
 236
 237 void sim_stop_reason PARAMS ((SIM_DESC sd, enum sim_stop *reason, int *sigrc));
 238
 239
 240 /* Passthru for other commands that the simulator might support.
 241    Simulators should be prepared to deal with any combination of NULL
 242    or empty CMD. */
 243
 244 void sim_do_command PARAMS ((SIM_DESC sd, char *cmd));
 245
 246 /* Call these functions to set and clear breakpoints at ADDR. */
 247
 248 SIM_RC sim_set_breakpoint PARAMS ((SIM_DESC sd, SIM_ADDR addr));
 249 SIM_RC sim_clear_breakpoint PARAMS ((SIM_DESC sd, SIM_ADDR addr));
 250 SIM_RC sim_clear_all_breakpoints PARAMS ((SIM_DESC sd));
 251
 252 /* These functions are used to enable and disable breakpoints. */
 253
 254 SIM_RC sim_enable_breakpoint PARAMS ((SIM_DESC sd, SIM_ADDR addr));
 255 SIM_RC sim_disable_breakpoint PARAMS ((SIM_DESC sd, SIM_ADDR addr));
 256 SIM_RC sim_enable_all_breakpoints PARAMS ((SIM_DESC sd));
 257 SIM_RC sim_disable_all_breakpoints PARAMS ((SIM_DESC sd));
 258 \f
 259
 260 /* Provide simulator with a default (global) host_callback_struct.
 261    THIS PROCEDURE IS DEPRECIATED.
 262    GDB and NRUN do not use this interface.
 263    This procedure does not take a SIM_DESC argument as it is
 264    used before sim_open. */
 265
 266 void sim_set_callbacks PARAMS ((struct host_callback_struct *));
 267
 268
 269 /* Set the size of the simulator memory array.
 270    THIS PROCEDURE IS DEPRECIATED.
 271    GDB and NRUN do not use this interface.
 272    This procedure does not take a SIM_DESC argument as it is
 273    used before sim_open. */
 274
 275 void sim_size PARAMS ((int i));
 276
 277
 278 /* Run a simulation with tracing enabled.
 279    THIS PROCEDURE IS DEPRECIATED.
 280    GDB and NRUN do not use this interface.
 281    This procedure does not take a SIM_DESC argument as it is
 282    used before sim_open. */
 283
 284 int sim_trace PARAMS ((SIM_DESC sd));
 285
 286
 287 /* Configure the size of the profile buffer.
 288    THIS PROCEDURE IS DEPRECIATED.
 289    GDB and NRUN do not use this interface.
 290    This procedure does not take a SIM_DESC argument as it is
 291    used before sim_open. */
 292
 293 void sim_set_profile_size PARAMS ((int n));
 294
 295
 296 /* Kill the running program.
 297    THIS PROCEDURE IS DEPRECIATED.
 298    GDB and NRUN do not use this interface.
 299    This procedure will be replaced as part of the introduction of
 300    multi-cpu simulators. */
 301
 302 void sim_kill PARAMS ((SIM_DESC sd));
 303
 304 #ifdef __cplusplus
 305 }
 306 #endif
 307
 308 #endif /* !defined (REMOTE_SIM_H) */