include/gdb/remote-sim.h

   1 /* This file defines the interface between the simulator and gdb.
   2
   3    Copyright 1993, 1994, 1996, 1997, 1998, 2000, 2002, 2007, 2008
   4    Free Software Foundation, Inc.
   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 3 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, see <http://www.gnu.org/licenses/>.  */
  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,
  60   SIM_RC_OK = 1
  61 } SIM_RC;
  62
  63
  64 /* The bfd struct, as an opaque type.  */
  65
  66 struct bfd;
  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
 107 SIM_DESC sim_open PARAMS ((SIM_OPEN_KIND kind, struct host_callback_struct *callback, struct bfd *abfd, char **argv));
 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
 118 void sim_close PARAMS ((SIM_DESC sd, int quitting));
 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
 144 SIM_RC sim_load PARAMS ((SIM_DESC sd, char *prog, struct bfd *abfd, int from_tty));
 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
 164 SIM_RC sim_create_inferior PARAMS ((SIM_DESC sd, struct bfd *abfd, char **argv, char **env));
 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
 171 int sim_read PARAMS ((SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length));
 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
 178 int sim_write PARAMS ((SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length));
 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
 190 int sim_fetch_register PARAMS ((SIM_DESC sd, int regno, unsigned char *buf, int length));
 191
 192
 193 /* Store register REGNO from the raw (target endian) value in BUF.
 194    Return the actual size of the register or zero if REGNO is not
 195    applicable.
 196
 197    Legacy implementations ignore LENGTH and always return -1.
 198
 199    If LENGTH does not match the size of REGNO no data is transfered
 200    (the actual register size is still returned). */
 201
 202 int sim_store_register PARAMS ((SIM_DESC sd, int regno, unsigned char *buf, int length));
 203
 204
 205 /* Print whatever statistics the simulator has collected.
 206
 207    VERBOSE is currently unused and must always be zero.  */
 208
 209 void sim_info PARAMS ((SIM_DESC sd, int verbose));
 210
 211
 212 /* Run (or resume) the simulated program.
 213
 214    STEP, when non-zero indicates that only a single simulator cycle
 215    should be emulated.
 216
 217    SIGGNAL, if non-zero is a (HOST) SIGRC value indicating the type of
 218    event (hardware interrupt, signal) to be delivered to the simulated
 219    program.
 220
 221    Hardware simulator: If the SIGRC value returned by
 222    sim_stop_reason() is passed back to the simulator via SIGGNAL then
 223    the hardware simulator shall correctly deliver the hardware event
 224    indicated by that signal.  If a value of zero is passed in then the
 225    simulation will continue as if there were no outstanding signal.
 226    The effect of any other SIGGNAL value is is implementation
 227    dependant.
 228
 229    Process simulator: If SIGRC is non-zero then the corresponding
 230    signal is delivered to the simulated program and execution is then
 231    continued.  A zero SIGRC value indicates that the program should
 232    continue as normal. */
 233
 234 void sim_resume PARAMS ((SIM_DESC sd, int step, int siggnal));
 235
 236
 237 /* Asynchronous request to stop the simulation.
 238    A nonzero return indicates that the simulator is able to handle
 239    the request */
 240
 241 int sim_stop PARAMS ((SIM_DESC sd));
 242
 243
 244 /* Fetch the REASON why the program stopped.
 245
 246    SIM_EXITED: The program has terminated. SIGRC indicates the target
 247    dependant exit status.
 248
 249    SIM_STOPPED: The program has stopped.  SIGRC uses the host's signal
 250    numbering as a way of identifying the reaon: program interrupted by
 251    user via a sim_stop request (SIGINT); a breakpoint instruction
 252    (SIGTRAP); a completed single step (SIGTRAP); an internal error
 253    condition (SIGABRT); an illegal instruction (SIGILL); Access to an
 254    undefined memory region (SIGSEGV); Mis-aligned memory access
 255    (SIGBUS).  For some signals information in addition to the signal
 256    number may be retained by the simulator (e.g. offending address),
 257    that information is not directly accessable via this interface.
 258
 259    SIM_SIGNALLED: The program has been terminated by a signal. The
 260    simulator has encountered target code that causes the the program
 261    to exit with signal SIGRC.
 262
 263    SIM_RUNNING, SIM_POLLING: The return of one of these values
 264    indicates a problem internal to the simulator. */
 265
 266 enum sim_stop { sim_running, sim_polling, sim_exited, sim_stopped, sim_signalled };
 267
 268 void sim_stop_reason PARAMS ((SIM_DESC sd, enum sim_stop *reason, int *sigrc));
 269
 270
 271 /* Passthru for other commands that the simulator might support.
 272    Simulators should be prepared to deal with any combination of NULL
 273    or empty CMD. */
 274
 275 void sim_do_command PARAMS ((SIM_DESC sd, char *cmd));
 276
 277 #ifdef __cplusplus
 278 }
 279 #endif
 280
 281 #endif /* !defined (REMOTE_SIM_H) */