sim/ppc/std-config.h

   1 /*  This file is part of the program psim.
   2
   3     Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19     */
  20
  21
  22 #ifndef _CONFIG_H_
  23 #define _CONFIG_H_
  24
  25
  26 /* endianness of the host/target:
  27
  28    If the build process is aware (at compile time) of the endianness
  29    of the host/target it is able to eliminate slower generic endian
  30    handling code.
  31
  32    Possible values are 0 (unknown), LITTLE_ENDIAN, BIG_ENDIAN */
  33
  34 #ifndef WITH_HOST_BYTE_ORDER
  35 #define WITH_HOST_BYTE_ORDER            0 /*unknown*/
  36 #endif
  37
  38 #ifndef WITH_TARGET_BYTE_ORDER
  39 #define WITH_TARGET_BYTE_ORDER          0 /*unknown*/
  40 #endif
  41
  42 extern int current_host_byte_order;
  43 #define CURRENT_HOST_BYTE_ORDER (WITH_HOST_BYTE_ORDER \
  44                                  ? WITH_HOST_BYTE_ORDER \
  45                                  : current_host_byte_order)
  46 extern int current_target_byte_order;
  47 #define CURRENT_TARGET_BYTE_ORDER (WITH_TARGET_BYTE_ORDER \
  48                                    ? WITH_TARGET_BYTE_ORDER \
  49                                    : current_target_byte_order)
  50
  51
  52 /* PowerPC XOR endian.
  53
  54    In addition to the above, the simulator can support the PowerPC's
  55    horrible XOR endian mode.  This feature makes it possible to
  56    control the endian mode of a processor using the MSR. */
  57
  58 #ifndef WITH_XOR_ENDIAN
  59 #define WITH_XOR_ENDIAN         8
  60 #endif
  61
  62
  63 /* Intel host BSWAP support:
  64
  65    Whether to use bswap on the 486 and pentiums rather than the 386
  66    sequence that uses xchgb/rorl/xchgb */
  67 #ifndef WITH_BSWAP
  68 #define WITH_BSWAP 0
  69 #endif
  70
  71
  72 /* SMP support:
  73
  74    Sets a limit on the number of processors that can be simulated.  If
  75    WITH_SMP is set to zero (0), the simulator is restricted to
  76    suporting only on processor (and as a consequence leaves the SMP
  77    code out of the build process).
  78
  79    The actual number of processors is taken from the device
  80    /options/smp@<nr-cpu> */
  81
  82 #ifndef WITH_SMP
  83 #define WITH_SMP                        5
  84 #endif
  85 #if WITH_SMP
  86 #define MAX_NR_PROCESSORS               WITH_SMP
  87 #else
  88 #define MAX_NR_PROCESSORS               1
  89 #endif
  90
  91
  92 /* Word size of host/target:
  93
  94    Set these according to your host and target requirements.  At this
  95    point in time, I've only compiled (not run) for a 64bit and never
  96    built for a 64bit host.  This will always remain a compile time
  97    option */
  98
  99 #ifndef WITH_TARGET_WORD_BITSIZE
 100 #define WITH_TARGET_WORD_BITSIZE        32 /* compiled only */
 101 #endif
 102
 103 #ifndef WITH_HOST_WORD_BITSIZE
 104 #define WITH_HOST_WORD_BITSIZE          32 /* 64bit ready? */
 105 #endif
 106
 107
 108 /* Program environment:
 109
 110    Three environments are available - UEA (user), VEA (virtual) and
 111    OEA (perating).  The former two are environment that users would
 112    expect to see (VEA includes things like coherency and the time
 113    base) while OEA is what an operating system expects to see.  By
 114    setting these to specific values, the build process is able to
 115    eliminate non relevent environment code
 116
 117    CURRENT_ENVIRONMENT specifies which of vea or oea is required for
 118    the current runtime. */
 119
 120 #define USER_ENVIRONMENT                1
 121 #define VIRTUAL_ENVIRONMENT             2
 122 #define OPERATING_ENVIRONMENT           3
 123
 124 #ifndef WITH_ENVIRONMENT
 125 #define WITH_ENVIRONMENT                0
 126 #endif
 127
 128 extern int current_environment;
 129 #define CURRENT_ENVIRONMENT (WITH_ENVIRONMENT \
 130                              ? WITH_ENVIRONMENT \
 131                              : current_environment)
 132
 133
 134 /* Optional VEA/OEA code:
 135
 136    The below, required for the OEA model may also be included in the
 137    VEA model however, as far as I can tell only make things
 138    slower... */
 139
 140
 141 /* Events.  Devices modeling real H/W need to be able to efficiently
 142    schedule things to do at known times in the future.  The event
 143    queue implements this.  Unfortunatly this adds the need to check
 144    for any events once each full instruction cycle. */
 145
 146 #define WITH_EVENTS                     (WITH_ENVIRONMENT != USER_ENVIRONMENT)
 147
 148
 149 /* Time base:
 150
 151    The PowerPC architecture includes the addition of both a time base
 152    register and a decrement timer.  Like events adds to the overhead
 153    of of some instruction cycles. */
 154
 155 #ifndef WITH_TIME_BASE
 156 #define WITH_TIME_BASE                  (WITH_ENVIRONMENT != USER_ENVIRONMENT)
 157 #endif
 158
 159
 160 /* Callback/Default Memory.
 161
 162    Core includes a builtin memory type (raw_memory) that is
 163    implemented using an array.  raw_memory does not require any
 164    additional functions etc.
 165
 166    Callback memory is where the core calls a core device for the data
 167    it requires.
 168
 169    Default memory is an extenstion of this where for addresses that do
 170    not map into either a callback or core memory range a default map
 171    can be used.
 172
 173    The OEA model uses callback memory for devices and default memory
 174    for buses.
 175
 176    The VEA model uses callback memory to capture `page faults'.
 177
 178    While it may be possible to eliminate callback/default memory (and
 179    hence also eliminate an additional test per memory fetch) it
 180    probably is not worth the effort.
 181
 182    BTW, while raw_memory could have been implemented as a callback,
 183    profiling has shown that there is a biger win (at least for the
 184    x86) in eliminating a function call for the most common
 185    (raw_memory) case. */
 186
 187 #define WITH_CALLBACK_MEMORY            1
 188
 189
 190 /* Alignment:
 191
 192    The PowerPC may or may not handle miss aligned transfers.  An
 193    implementation normally handles miss aligned transfers in big
 194    endian mode but generates an exception in little endian mode.
 195
 196    This model.  Instead allows both little and big endian modes to
 197    either take exceptions or handle miss aligned transfers.
 198
 199    If 0 is specified then for big-endian mode miss alligned accesses
 200    are permitted (NONSTRICT_ALIGNMENT) while in little-endian mode the
 201    processor will fault on them (STRICT_ALIGNMENT). */
 202
 203 #define NONSTRICT_ALIGNMENT             1
 204 #define STRICT_ALIGNMENT                2
 205
 206 #ifndef WITH_ALIGNMENT
 207 #define WITH_ALIGNMENT                  0
 208 #endif
 209
 210 extern int current_alignment;
 211 #define CURRENT_ALIGNMENT (WITH_ALIGNMENT \
 212                            ? WITH_ALIGNMENT \
 213                            : current_alignment)
 214
 215
 216 /* Floating point suport:
 217
 218    Still under development. */
 219
 220 #define SOFT_FLOATING_POINT             1
 221 #define HARD_FLOATING_POINT             2
 222
 223 #ifndef WITH_FLOATING_POINT
 224 #define WITH_FLOATING_POINT             HARD_FLOATING_POINT
 225 #endif
 226 extern int current_floating_point;
 227 #define CURRENT_FLOATING_POINT (WITH_FLOATING_POINT \
 228                                 ? WITH_FLOATING_POINT \
 229                                 : current_floating_point)
 230
 231
 232 /* Debugging:
 233
 234    Control the inclusion of debugging code. */
 235
 236 /* Include the tracing code.  Disabling this eliminates all tracing
 237    code */
 238
 239 #ifndef WITH_TRACE
 240 #define WITH_TRACE                      1
 241 #endif
 242
 243 /* include code that checks assertions scattered through out the
 244    program */
 245
 246 #ifndef WITH_ASSERT
 247 #define WITH_ASSERT                     1
 248 #endif
 249
 250 /* Whether to check instructions for reserved bits being set */
 251
 252 #ifndef WITH_RESERVED_BITS
 253 #define WITH_RESERVED_BITS              1
 254 #endif
 255
 256 /* include monitoring code */
 257
 258 #define MONITOR_INSTRUCTION_ISSUE       1
 259 #define MONITOR_LOAD_STORE_UNIT         2
 260 #ifndef WITH_MON
 261 #define WITH_MON                        (MONITOR_LOAD_STORE_UNIT \
 262                                          | MONITOR_INSTRUCTION_ISSUE)
 263 #endif
 264
 265 /* Current CPU model (models are in the generated models.h include file)  */
 266 #ifndef WITH_MODEL
 267 #define WITH_MODEL                      0
 268 #endif
 269
 270 #define CURRENT_MODEL (WITH_MODEL       \
 271                        ? WITH_MODEL     \
 272                        : current_model)
 273
 274 #ifndef WITH_DEFAULT_MODEL
 275 #define WITH_DEFAULT_MODEL              DEFAULT_MODEL
 276 #endif
 277
 278 #ifndef WITH_MODEL_ISSUE
 279 #define WITH_MODEL_ISSUE                1
 280 #endif
 281
 282 /* INLINE CODE SELECTION:
 283
 284    GCC -O3 attempts to inline any function or procedure in scope.  The
 285    options below facilitate fine grained control over what is and what
 286    isn't made inline.  For instance it can control things down to a
 287    specific modules static routines.  This control is implemented in
 288    two parts.  Doing this allows the compiler to both eliminate the
 289    overhead of function calls and (as a consequence) also eliminate
 290    further dead code.
 291
 292    Experementing with CISC (x86) I've found that I can achieve an
 293    order of magintude speed improvement (x3-x5).  In the case of RISC
 294    (sparc) while the performance gain isn't as great it is still
 295    significant.
 296
 297    Part One - Static functions: It is possible to control how static
 298    functions within each module are to be compiled.  On a per module
 299    or global basis, it is possible to specify that a modules static
 300    functions should be compiled inline.  This is controled by the the
 301    macro's STATIC_INLINE and INLINE_STATIC_<module>.
 302
 303    Part Two - External functions: Again it is possible to allow the
 304    inlining of calls to external functions.  This is far more
 305    complicated and much heaver on the compiler.  In this case, it is
 306    controled by the <module>_INLINE macro's.  Where each can have a
 307    value:
 308
 309       0  Make a normal external call to functions in the module.
 310
 311       1  Include the module but to not inline functions within it.
 312          This allows functions within the module to inline functions
 313          from other modules that have been included.
 314
 315       2  Both include the module and inline functions contained within
 316          it.
 317
 318    Finally, this is not for the faint harted.  I've seen GCC get up to
 319    200mb trying to compile what this can create */
 320
 321 /* Your compilers inline reserved word */
 322
 323 #ifndef INLINE
 324 #if defined(__GNUC__) && defined(__OPTIMIZE__) && \
 325   (DEFAULT_INLINE || SIM_ENDIAN_INLINE || BITS_INLINE || CPU_INLINE || VM_INLINE || CORE_INLINE \
 326    || EVENTS_INLINE || MON_INLINE || INTERRUPTS_INLINE || REGISTERS_INLINE || DEVICE_TREE_INLINE \
 327    || DEVICES_INLINE || SPREG_INLINE || SEMANTICS_INLINE || IDECODE_INLINE || MODEL_INLINE)
 328 #define INLINE __inline__
 329 #else
 330 #define INLINE /*inline*/
 331 #endif
 332 #endif
 333
 334 /* Default prefix for static functions */
 335
 336 #ifndef STATIC_INLINE
 337 #define STATIC_INLINE static INLINE
 338 #endif
 339
 340 /* Default macro to simplify control several of key the inlines */
 341
 342 #ifndef DEFAULT_INLINE
 343 #define DEFAULT_INLINE                  0
 344 #endif
 345
 346 /* Code that converts between hosts and target byte order.  Used on
 347    every memory access (instruction and data).  (See sim-endian.h for
 348    additional byte swapping configuration information) */
 349
 350 #ifndef SIM_ENDIAN_INLINE
 351 #define SIM_ENDIAN_INLINE               DEFAULT_INLINE
 352 #endif
 353
 354 /* Low level bit manipulation routines used to work around a compiler
 355    bug in 2.6.3.  */
 356
 357 #ifndef BITS_INLINE
 358 #define BITS_INLINE                     DEFAULT_INLINE
 359 #endif
 360
 361 /* Code that gives access to various CPU internals such as registers.
 362    Used every time an instruction is executed */
 363
 364 #ifndef CPU_INLINE
 365 #define CPU_INLINE                      DEFAULT_INLINE
 366 #endif
 367
 368 /* Code that translates between an effective and real address.  Used
 369    by every load or store. */
 370
 371 #ifndef VM_INLINE
 372 #define VM_INLINE                       DEFAULT_INLINE
 373 #endif
 374
 375 /* Code that loads/stores data to/from the memory data structure.
 376    Used by every load or store */
 377
 378 #ifndef CORE_INLINE
 379 #define CORE_INLINE                     DEFAULT_INLINE
 380 #endif
 381
 382 /* Code to check for and process any events scheduled in the future.
 383    Called once per instruction cycle */
 384
 385 #ifndef EVENTS_INLINE
 386 #define EVENTS_INLINE                   DEFAULT_INLINE
 387 #endif
 388
 389 /* Code monotoring the processors performance.  It counts events on
 390    every instruction cycle */
 391
 392 #ifndef MON_INLINE
 393 #define MON_INLINE                      DEFAULT_INLINE
 394 #endif
 395
 396 /* Code called on the rare occasions that an interrupt occures. */
 397
 398 #ifndef INTERRUPTS_INLINE
 399 #define INTERRUPTS_INLINE               0
 400 #endif
 401
 402 /* Code called on the rare occasion that either gdb or the device tree
 403    need to manipulate a register within a processor */
 404
 405 #ifndef REGISTERS_INLINE
 406 #define REGISTERS_INLINE                0
 407 #endif
 408
 409 /* Code called on the rare occasion that a processor is manipulating
 410    real hardware instead of RAM.
 411
 412    Also, most of the functions in devices.c are always called through
 413    a jump table.
 414
 415    There seems to be some problem with making either device_tree or
 416    devices inline.  It reports the message: device_tree_find_node()
 417    not a leaf */
 418
 419 #ifndef DEVICE_TREE_INLINE
 420 #define DEVICE_TREE_INLINE              0
 421 #endif
 422
 423 #ifndef DEVICES_INLINE
 424 #define DEVICES_INLINE                  0
 425 #endif
 426
 427 /* Code called whenever information on a Special Purpose Register is
 428    required.  Called by the mflr/mtlr pseudo instructions */
 429
 430 #ifndef SPREG_INLINE
 431 #define SPREG_INLINE                    DEFAULT_INLINE
 432 #endif
 433
 434 /* Functions modeling the semantics of each instruction.  Two cases to
 435    consider, firstly of idecode is implemented with a switch then this
 436    allows the idecode function to inline each semantic function
 437    (avoiding a call).  The second case is when idecode is using a
 438    table, even then while the semantic functions can't be inlined,
 439    setting it to one still enables each semantic function to inline
 440    anything they call (if that code is marked for being inlined).
 441
 442    WARNING: you need lots (like 200mb of swap) of swap.  Setting this
 443    to 1 is useful when using a table as it enables the sematic code to
 444    inline all of their called functions */
 445
 446 #ifndef SEMANTICS_INLINE
 447 #define SEMANTICS_INLINE                (DEFAULT_INLINE ? 1 : 0)
 448 #endif
 449
 450 /* Code to decode an instruction. Normally called on every instruction
 451    cycle */
 452
 453 #ifndef IDECODE_INLINE
 454 #define IDECODE_INLINE                  DEFAULT_INLINE
 455 #endif
 456
 457 /* Model specific code used in simulating functional units.  Note, it actaully
 458    pays NOT to inline the PowerPC model functions (at least on the x86).  This
 459    is because if it is inlined, each PowerPC instruction gets a separate copy
 460    of the code, which is not friendly to the cache.  */
 461
 462 #ifndef MODEL_INLINE
 463 #define MODEL_INLINE                    (DEFAULT_INLINE ? 1 : 0)
 464 #endif
 465
 466 /* Code to print out what options we were compiled with.  Because this
 467    is called at process startup, it doesn't have to be inlined, but
 468    if it isn't brought in and the model routines are inline, the model
 469    routines will be pulled in twice.  */
 470
 471 #ifndef OPTIONS_INLINE
 472 #define OPTIONS_INLINE                  (DEFAULT_INLINE ? 1 : 0)
 473 #endif
 474
 475 #endif /* _CONFIG_H */