gdb/config/a29k/tm-a29k.h

   1 /* Parameters for target machine AMD 29000, for GDB, the GNU debugger.
   2    Copyright 1990, 1991, 1993, 1994 Free Software Foundation, Inc.
   3    Contributed by Cygnus Support.  Written by Jim Kingdon.
   4
   5 This file is part of GDB.
   6
   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 2 of the License, or
  10 (at your option) any later version.
  11
  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.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /* Parameters for an EB29K (a board which plugs into a PC and is
  22    accessed through EBMON software running on the PC, which we
  23    use as we'd use a remote stub (see remote-eb.c).
  24
  25    If gdb is ported to other a29k machines/systems, the
  26    machine/system-specific parts should be removed from this file (a
  27    la tm-m68k.h).  */
  28
  29 /* Byte order is configurable, but this machine runs big-endian.  */
  30 #define TARGET_BYTE_ORDER BIG_ENDIAN
  31
  32 /* Floating point uses IEEE representations.  */
  33 #define IEEE_FLOAT
  34
  35 /* Recognize our magic number.  */
  36 #define BADMAG(x) ((x).f_magic != 0572)
  37
  38 /* Offset from address of function to start of its code.
  39    Zero on most machines.  */
  40
  41 #define FUNCTION_START_OFFSET 0
  42
  43 /* Advance PC across any function entry prologue instructions
  44    to reach some "real" code.  */
  45
  46 #define SKIP_PROLOGUE(pc) \
  47   { pc = skip_prologue (pc); }
  48 CORE_ADDR skip_prologue ();
  49
  50 /* Immediately after a function call, return the saved pc.
  51    Can't go through the frames for this because on some machines
  52    the new frame is not set up until the new function executes
  53    some instructions.  */
  54
  55 #define SAVED_PC_AFTER_CALL(frame) ((frame->flags & TRANSPARENT) \
  56                                     ? read_register (TPC_REGNUM) \
  57                                     : read_register (LR0_REGNUM))
  58
  59 /* I'm not sure about the exact value of this, but based on looking
  60    at the stack pointer when we get to main this seems to be right.
  61
  62    This is the register stack; We call it "CONTROL" in GDB for consistency
  63    with Pyramid.  */
  64 /* I suspect this is obsolete, just like STACK_END_ADDR.  */
  65 #define CONTROL_END_ADDR 0x80200000
  66
  67 /* Stack grows downward.  */
  68
  69 #define INNER_THAN <
  70
  71 /* Stack must be aligned on 32-bit word boundaries.  */
  72 #define STACK_ALIGN(ADDR) (((ADDR) + 3) & ~3)
  73
  74 /* Sequence of bytes for breakpoint instruction.  */
  75 /* ASNEQ 0x50, gr1, gr1
  76    The trap number 0x50 is chosen arbitrarily.
  77    We let the command line (or previously included files) override this
  78    setting.  */
  79 #ifndef BREAKPOINT
  80 #if TARGET_BYTE_ORDER == BIG_ENDIAN
  81 #define BREAKPOINT {0x72, 0x50, 0x01, 0x01}
  82 #else /* Target is little-endian.  */
  83 #define BREAKPOINT {0x01, 0x01, 0x50, 0x72}
  84 #endif /* Target is little-endian.  */
  85 #endif /* BREAKPOINT */
  86
  87 /* Amount PC must be decremented by after a breakpoint.
  88    This is often the number of bytes in BREAKPOINT
  89    but not always.  */
  90
  91 #define DECR_PC_AFTER_BREAK 0
  92
  93 /* Nonzero if instruction at PC is a return instruction.
  94    On the a29k, this is a "jmpi l0" instruction.  */
  95
  96 #define ABOUT_TO_RETURN(pc) \
  97   ((read_memory_integer (pc, 4) & 0xff0000ff) == 0xc0000080)
  98
  99 /* Return 1 if P points to an invalid floating point value.  */
 100
 101 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
 102
 103 /* Say how long (ordinary) registers are.  This is a piece of bogosity
 104    used in push_word and a few other places; REGISTER_RAW_SIZE is the
 105    real way to know how big a register is.  */
 106
 107 #define REGISTER_SIZE 4
 108
 109 /* Allow the register declarations here to be overridden for remote
 110    kernel debugging.  */
 111 #if !defined (REGISTER_NAMES)
 112
 113 /* Number of machine registers */
 114
 115 #define NUM_REGS 205
 116
 117 /* Initializer for an array of names of registers.
 118    There should be NUM_REGS strings in this initializer.
 119
 120    FIXME, add floating point registers and support here.
 121
 122    Also note that this list does not attempt to deal with kernel
 123    debugging (in which the first 32 registers are gr64-gr95).  */
 124
 125 #define REGISTER_NAMES \
 126 {"gr96", "gr97", "gr98", "gr99", "gr100", "gr101", "gr102", "gr103", "gr104", \
 127  "gr105", "gr106", "gr107", "gr108", "gr109", "gr110", "gr111", "gr112", \
 128  "gr113", "gr114", "gr115", "gr116", "gr117", "gr118", "gr119", "gr120", \
 129  "gr121", "gr122", "gr123", "gr124", "gr125", "gr126", "gr127",          \
 130  "lr0", "lr1", "lr2", "lr3", "lr4", "lr5", "lr6", "lr7", "lr8", "lr9",   \
 131  "lr10", "lr11", "lr12", "lr13", "lr14", "lr15", "lr16", "lr17", "lr18", \
 132  "lr19", "lr20", "lr21", "lr22", "lr23", "lr24", "lr25", "lr26", "lr27", \
 133  "lr28", "lr29", "lr30", "lr31", "lr32", "lr33", "lr34", "lr35", "lr36", \
 134  "lr37", "lr38", "lr39", "lr40", "lr41", "lr42", "lr43", "lr44", "lr45", \
 135  "lr46", "lr47", "lr48", "lr49", "lr50", "lr51", "lr52", "lr53", "lr54", \
 136  "lr55", "lr56", "lr57", "lr58", "lr59", "lr60", "lr61", "lr62", "lr63", \
 137  "lr64", "lr65", "lr66", "lr67", "lr68", "lr69", "lr70", "lr71", "lr72", \
 138  "lr73", "lr74", "lr75", "lr76", "lr77", "lr78", "lr79", "lr80", "lr81", \
 139  "lr82", "lr83", "lr84", "lr85", "lr86", "lr87", "lr88", "lr89", "lr90", \
 140  "lr91", "lr92", "lr93", "lr94", "lr95", "lr96", "lr97", "lr98", "lr99", \
 141  "lr100", "lr101", "lr102", "lr103", "lr104", "lr105", "lr106", "lr107", \
 142  "lr108", "lr109", "lr110", "lr111", "lr112", "lr113", "lr114", "lr115", \
 143  "lr116", "lr117", "lr118", "lr119", "lr120", "lr121", "lr122", "lr123", \
 144  "lr124", "lr125", "lr126", "lr127",                                     \
 145   "AI0", "AI1", "AI2", "AI3", "AI4", "AI5", "AI6", "AI7", "AI8", "AI9",  \
 146   "AI10", "AI11", "AI12", "AI13", "AI14", "AI15", "FP",                  \
 147   "bp", "fc", "cr", "q",                                                 \
 148   "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr",  \
 149   "pc0", "pc1", "pc2", "mmu", "lru", "fpe", "inte", "fps", "exo", "gr1",  \
 150   "alu", "ipc", "ipa", "ipb" }
 151
 152 /*
 153  * Converts an sdb register number to an internal gdb register number.
 154  * Currently under epi, gr96->0...gr127->31...lr0->32...lr127->159, or...
 155  *                      gr64->0...gr95->31, lr0->32...lr127->159.
 156  */
 157 #define SDB_REG_TO_REGNUM(value) \
 158   (((value) >= 96 && (value) <= 127) ? ((value) - 96) : \
 159    ((value) >= 128 && (value) <=  255) ? ((value) - 128 + LR0_REGNUM) : \
 160    (value))
 161
 162 /*
 163  * Provide the processor register numbers of some registers that are
 164  * expected/written in instructions that might change under different
 165  * register sets.  Namely, gcc can compile (-mkernel-registers) so that
 166  * it uses gr64-gr95 in stead of gr96-gr127.
 167  */
 168 #define MSP_HW_REGNUM   125             /* gr125 */
 169 #define RAB_HW_REGNUM   126             /* gr126 */
 170
 171 /* Convert Processor Special register #x to REGISTER_NAMES register # */
 172 #define SR_REGNUM(x) \
 173   ((x) < 15  ? VAB_REGNUM + (x)                                  \
 174    : (x) >= 128 && (x) < 131 ? IPC_REGNUM + (x) - 128            \
 175    : (x) == 131 ? Q_REGNUM                                       \
 176    : (x) == 132 ? ALU_REGNUM                                     \
 177    : (x) >= 133 && (x) < 136 ? BP_REGNUM + (x) - 133             \
 178    : (x) >= 160 && (x) < 163 ? FPE_REGNUM + (x) - 160            \
 179    : (x) == 164 ? EXO_REGNUM                                     \
 180    : (error ("Internal error in SR_REGNUM"), 0))
 181 #define GR96_REGNUM 0
 182
 183 /* Define the return register separately, so it can be overridden for
 184    kernel procedure calling conventions. */
 185 #define RETURN_REGNUM   GR96_REGNUM
 186 #define GR1_REGNUM 200
 187 /* This needs to be the memory stack pointer, not the register stack pointer,
 188    to make call_function work right.  */
 189 #define SP_REGNUM MSP_REGNUM
 190 #define FP_REGNUM 33 /* lr1 */
 191
 192 /* Return register for transparent calling convention (gr122).  */
 193 #define TPC_REGNUM (122 - 96 + GR96_REGNUM)
 194
 195 /* Large Return Pointer (gr123).  */
 196 #define LRP_REGNUM (123 - 96 + GR96_REGNUM)
 197
 198 /* Static link pointer (gr124).  */
 199 #define SLP_REGNUM (124 - 96 + GR96_REGNUM)
 200
 201 /* Memory Stack Pointer (gr125).  */
 202 #define MSP_REGNUM (125 - 96 + GR96_REGNUM)
 203
 204 /* Register allocate bound (gr126).  */
 205 #define RAB_REGNUM (126 - 96 + GR96_REGNUM)
 206
 207 /* Register Free Bound (gr127).  */
 208 #define RFB_REGNUM (127 - 96 + GR96_REGNUM)
 209
 210 /* Register Stack Pointer.  */
 211 #define RSP_REGNUM GR1_REGNUM
 212 #define LR0_REGNUM 32
 213 #define BP_REGNUM 177
 214 #define FC_REGNUM 178
 215 #define CR_REGNUM 179
 216 #define Q_REGNUM 180
 217 #define VAB_REGNUM 181
 218 #define OPS_REGNUM (VAB_REGNUM + 1)
 219 #define CPS_REGNUM (VAB_REGNUM + 2)
 220 #define CFG_REGNUM (VAB_REGNUM + 3)
 221 #define CHA_REGNUM (VAB_REGNUM + 4)
 222 #define CHD_REGNUM (VAB_REGNUM + 5)
 223 #define CHC_REGNUM (VAB_REGNUM + 6)
 224 #define RBP_REGNUM (VAB_REGNUM + 7)
 225 #define TMC_REGNUM (VAB_REGNUM + 8)
 226 #define TMR_REGNUM (VAB_REGNUM + 9)
 227 #define NPC_REGNUM (VAB_REGNUM + 10)  /* pc0 */
 228 #define PC_REGNUM  (VAB_REGNUM + 11)  /* pc1 */
 229 #define PC2_REGNUM (VAB_REGNUM + 12)
 230 #define MMU_REGNUM (VAB_REGNUM + 13)
 231 #define LRU_REGNUM (VAB_REGNUM + 14)
 232 #define FPE_REGNUM (VAB_REGNUM + 15)
 233 #define INTE_REGNUM (VAB_REGNUM + 16)
 234 #define FPS_REGNUM (VAB_REGNUM + 17)
 235 #define EXO_REGNUM (VAB_REGNUM + 18)
 236 /* gr1 is defined above as 200 = VAB_REGNUM + 19 */
 237 #define ALU_REGNUM (VAB_REGNUM + 20)
 238 #define PS_REGNUM  ALU_REGNUM
 239 #define IPC_REGNUM (VAB_REGNUM + 21)
 240 #define IPA_REGNUM (VAB_REGNUM + 22)
 241 #define IPB_REGNUM (VAB_REGNUM + 23)
 242
 243 #endif  /* !defined(REGISTER_NAMES) */
 244
 245 /* Total amount of space needed to store our copies of the machine's
 246    register state, the array `registers'.  */
 247 #define REGISTER_BYTES (NUM_REGS * 4)
 248
 249 /* Index within `registers' of the first byte of the space for
 250    register N.  */
 251 #define REGISTER_BYTE(N)  ((N)*4)
 252
 253 /* Number of bytes of storage in the actual machine representation
 254    for register N.  */
 255
 256 /* All regs are 4 bytes.  */
 257
 258 #define REGISTER_RAW_SIZE(N) (4)
 259
 260 /* Number of bytes of storage in the program's representation
 261    for register N.  */
 262
 263 /* All regs are 4 bytes.  */
 264
 265 #define REGISTER_VIRTUAL_SIZE(N) (4)
 266
 267 /* Largest value REGISTER_RAW_SIZE can have.  */
 268
 269 #define MAX_REGISTER_RAW_SIZE (4)
 270
 271 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 272
 273 #define MAX_REGISTER_VIRTUAL_SIZE (4)
 274
 275 /* Return the GDB type object for the "standard" data type
 276    of data in register N.  */
 277
 278 #define REGISTER_VIRTUAL_TYPE(N) \
 279   (((N) == PC_REGNUM || (N) == LRP_REGNUM || (N) == SLP_REGNUM         \
 280     || (N) == MSP_REGNUM || (N) == RAB_REGNUM || (N) == RFB_REGNUM     \
 281     || (N) == GR1_REGNUM || (N) == FP_REGNUM || (N) == LR0_REGNUM       \
 282     || (N) == NPC_REGNUM || (N) == PC2_REGNUM)                           \
 283    ? lookup_pointer_type (builtin_type_void) : builtin_type_int)
 284 \f
 285 /* Store the address of the place in which to copy the structure the
 286    subroutine will return.  This is called from call_function. */
 287 /* On the a29k the LRP points to the part of the structure beyond the first
 288    16 words.  */
 289 #define STORE_STRUCT_RETURN(ADDR, SP) \
 290   write_register (LRP_REGNUM, (ADDR) + 16 * 4);
 291
 292 /* Should call_function allocate stack space for a struct return?  */
 293 /* On the a29k objects over 16 words require the caller to allocate space.  */
 294 #define USE_STRUCT_CONVENTION(gcc_p, type) (TYPE_LENGTH (type) > 16 * 4)
 295
 296 /* Extract from an array REGBUF containing the (raw) register state
 297    a function return value of type TYPE, and copy that, in virtual format,
 298    into VALBUF.  */
 299
 300 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF)              \
 301   {                                                                        \
 302     int reg_length = TYPE_LENGTH (TYPE);                                   \
 303     if (reg_length > 16 * 4)                                               \
 304       {                                                                    \
 305         reg_length = 16 * 4;                                               \
 306         read_memory (*((int *)(REGBUF) + LRP_REGNUM), (VALBUF) + 16 * 4,   \
 307                      TYPE_LENGTH (TYPE) - 16 * 4);                         \
 308       }                                                                    \
 309     memcpy ((VALBUF), ((int *)(REGBUF))+RETURN_REGNUM, reg_length);        \
 310   }
 311
 312 /* Write into appropriate registers a function return value
 313    of type TYPE, given in virtual format.  */
 314
 315 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 316   {                                                                       \
 317     int reg_length = TYPE_LENGTH (TYPE);                                  \
 318     if (reg_length > 16 * 4)                                              \
 319       {                                                                   \
 320         reg_length = 16 * 4;                                              \
 321         write_memory (read_register (LRP_REGNUM),                         \
 322                       (char *)(VALBUF) + 16 * 4,                          \
 323                       TYPE_LENGTH (TYPE) - 16 * 4);                       \
 324       }                                                                   \
 325     write_register_bytes (REGISTER_BYTE (RETURN_REGNUM), (char *)(VALBUF),  \
 326                           TYPE_LENGTH (TYPE));                            \
 327   }
 328 \f
 329 /* The a29k user's guide documents well what the stacks look like.
 330    But what isn't so clear there is how this interracts with the
 331    symbols, or with GDB.
 332    In the following saved_msp, saved memory stack pointer (which functions
 333    as a memory frame pointer), means either
 334    a register containing the memory frame pointer or, in the case of
 335    functions with fixed size memory frames (i.e. those who don't use
 336    alloca()), the result of the calculation msp + msize.
 337
 338    LOC_ARG, LOC_LOCAL - For GCC, these are relative to saved_msp.
 339      For high C, these are relative to msp (making alloca impossible).
 340    LOC_REGISTER, LOC_REGPARM - The register number is the number at the
 341      time the function is running (after the prologue), or in the case
 342      of LOC_REGPARM, may be a register number in the range 160-175.
 343
 344    The compilers do things like store an argument into memory, and then put out
 345    a LOC_ARG for it, or put it into global registers and put out a
 346    LOC_REGPARM.  Thus is it important to execute the first line of
 347    code (i.e. the line of the open brace, i.e. the prologue) of a function
 348    before trying to print arguments or anything.
 349
 350    The following diagram attempts to depict what is going on in memory
 351    (see also the _a29k user's guide_) and also how that interacts with
 352    GDB frames.  We arbitrarily pick fci->frame to point the same place
 353    as the register stack pointer; since we set it ourself in
 354    INIT_EXTRA_FRAME_INFO, and access it only through the FRAME_*
 355    macros, it doesn't really matter exactly how we
 356    do it.  However, note that FRAME_FP is used in two ways in GDB:
 357    (1) as a "magic cookie" which uniquely identifies frames (even over
 358    calls to the inferior), (2) (in PC_IN_CALL_DUMMY [ON_STACK])
 359    as the value of SP_REGNUM before the dummy frame was pushed.  These
 360    two meanings would be incompatible for the a29k if we defined
 361    CALL_DUMMY_LOCATION == ON_STACK (but we don't, so don't worry about it).
 362    Also note that "lr1" below, while called a frame pointer
 363    in the user's guide, has only one function:  To determine whether
 364    registers need to be filled in the function epilogue.
 365
 366    Consider the code:
 367               < call bar>
 368         loc1: . . .
 369         bar:  sub gr1,gr1,rsize_b
 370               . . .
 371               add mfp,msp,0
 372               sub msp,msp,msize_b
 373               . . .
 374               < call foo >
 375         loc2: . . .
 376         foo:  sub gr1,gr1,rsize_f
 377               . . .
 378               add mfp,msp,0
 379               sub msp,msp,msize_f
 380               . . .
 381         loc3: < suppose the inferior stops here >
 382
 383                    memory stack      register stack
 384                    |           |     |____________|
 385                    |           |     |____loc1____|
 386           +------->|___________|     |            |   ^
 387           |        | ^         |     |  locals_b  |   |
 388           |        | |         |     |____________|   |
 389           |        | |         |     |            |   | rsize_b
 390           |        | | msize_b |     | args_to_f  |   |
 391           |        | |         |     |____________|   |
 392           |        | |         |     |____lr1_____|   V
 393           |        | V         |     |____loc2____|<----------------+
 394           |   +--->|___________|<---------mfp     |   ^             |
 395           |   |    | ^         |     |  locals_f  |   |             |
 396           |   |    | | msize_f |     |____________|   |             |
 397           |   |    | |         |     |            |   | rsize_f     |
 398           |   |    | V         |     |   args     |   |             |
 399           |   |    |___________|<msp |____________|   |             |
 400           |   |                      |_____lr1____|   V             |
 401           |   |                      |___garbage__| <- gr1 <----+   |
 402           |   |                                                 |   |
 403           |   |                                                 |   |
 404           |   |                      pc=loc3                    |   |
 405           |   |                                                 |   |
 406           |   |                                                 |   |
 407           |   |            frame cache                          |   |
 408           |   |       |_________________|                       |   |
 409           |   |       |rsize=rsize_b    |                       |   |
 410           |   |       |msize=msize_b    |                       |   |
 411           +---|--------saved_msp        |                       |   |
 412               |       |frame------------------------------------|---+
 413               |       |pc=loc2          |                       |
 414               |       |_________________|                       |
 415               |       |rsize=rsize_f    |                       |
 416               |       |msize=msize_f    |                       |
 417               +--------saved_msp        |                       |
 418                       |frame------------------------------------+
 419                       |pc=loc3          |
 420                       |_________________|
 421
 422    So, is that sufficiently confusing?  Welcome to the 29000.
 423    Notes:
 424    * The frame for foo uses a memory frame pointer but the frame for
 425      bar does not.  In the latter case the saved_msp is
 426      computed by adding msize to the saved_msp of the
 427      next frame.
 428    * msize is in the frame cache only for high C's sake.  */
 429
 430 void read_register_stack ();
 431 long read_register_stack_integer ();
 432 \f
 433 #define EXTRA_FRAME_INFO  \
 434   CORE_ADDR saved_msp;    \
 435   unsigned int rsize;     \
 436   unsigned int msize;     \
 437   unsigned char flags;
 438
 439 /* Bits for flags in EXTRA_FRAME_INFO */
 440 #define TRANSPARENT     0x1             /* This is a transparent frame */
 441 #define MFP_USED        0x2             /* A memory frame pointer is used */
 442
 443 /* Because INIT_FRAME_PC gets passed fromleaf, that's where we init
 444    not only ->pc and ->frame, but all the extra stuff, when called from
 445    get_prev_frame_info, that is.  */
 446 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci)  init_extra_frame_info(fci)
 447 void init_extra_frame_info ();
 448
 449 #define INIT_FRAME_PC(fromleaf, fci) init_frame_pc(fromleaf, fci)
 450 void init_frame_pc ();
 451
 452 \f
 453 /* FRAME_CHAIN takes a FRAME
 454    and produces the frame's chain-pointer.
 455
 456    However, if FRAME_CHAIN_VALID returns zero,
 457    it means the given frame is the outermost one and has no caller.  */
 458
 459 /* On the a29k, the nominal address of a frame is the address on the
 460    register stack of the return address (the one next to the incoming
 461    arguments, not down at the bottom so nominal address == stack pointer).
 462
 463    GDB expects "nominal address" to equal contents of FP_REGNUM,
 464    at least when it comes time to create the innermost frame.
 465    However, that doesn't work for us, so when creating the innermost
 466    frame we set ->frame ourselves in INIT_EXTRA_FRAME_INFO.  */
 467
 468 /* These are mostly dummies for the a29k because INIT_FRAME_PC
 469    sets prev->frame instead.  */
 470 /* If rsize is zero, we must be at end of stack (or otherwise hosed).
 471    If we don't check rsize, we loop forever if we see rsize == 0.  */
 472 #define FRAME_CHAIN(thisframe) \
 473   ((thisframe)->rsize == 0 \
 474    ? 0 \
 475    : (thisframe)->frame + (thisframe)->rsize)
 476
 477 /* Determine if the frame has a 'previous' and back-traceable frame. */
 478 #define FRAME_IS_UNCHAINED(frame)       ((frame)->flags & TRANSPARENT)
 479
 480 /* Find the previous frame of a transparent routine.
 481  * For now lets not try and trace through a transparent routine (we might
 482  * have to assume that all transparent routines are traps).
 483  */
 484 #define FIND_PREV_UNCHAINED_FRAME(frame)        0
 485
 486 /* Define other aspects of the stack frame.  */
 487
 488 /* A macro that tells us whether the function invocation represented
 489    by FI does not have a frame on the stack associated with it.  If it
 490    does not, FRAMELESS is set to 1, else 0.  */
 491 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 492   (FRAMELESS) = frameless_look_for_prologue(FI)
 493
 494 /* Saved pc (i.e. return address).  */
 495 #define FRAME_SAVED_PC(fraim) \
 496   (read_register_stack_integer ((fraim)->frame + (fraim)->rsize, 4))
 497
 498 /* Local variables (i.e. LOC_LOCAL) are on the memory stack, with their
 499    offsets being relative to the memory stack pointer (high C) or
 500    saved_msp (gcc).  */
 501
 502 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address (fi)
 503 extern CORE_ADDR frame_locals_address ();
 504
 505 /* Return number of args passed to a frame.
 506    Can return -1, meaning no way to tell.  */
 507 /* We tried going to the effort of finding the tags word and getting
 508    the argcount field from it, to support debugging assembler code.
 509    Problem was, the "argcount" field never did hold the argument
 510    count.  */
 511 #define FRAME_NUM_ARGS(numargs, fi) ((numargs) = -1)
 512
 513 #define FRAME_ARGS_ADDRESS(fi) FRAME_LOCALS_ADDRESS (fi)
 514
 515 /* Return number of bytes at start of arglist that are not really args.  */
 516
 517 #define FRAME_ARGS_SKIP 0
 518
 519 /* Provide our own get_saved_register.  HAVE_REGISTER_WINDOWS is insufficient
 520    because registers get renumbered on the a29k without getting saved.  */
 521
 522 #define GET_SAVED_REGISTER
 523 \f
 524 /* Call function stuff.  */
 525
 526 /* The dummy frame looks like this (see also the general frame picture
 527    above):
 528
 529                                         register stack
 530
 531                                       |                |  frame for function
 532                                       |   locals_sproc |  executing at time
 533                                       |________________|  of call_function.
 534                                       |                |  We must not disturb
 535                                       | args_out_sproc |  it.
 536         memory stack                  |________________|
 537                                       |____lr1_sproc___|<-+
 538        |            |                 |__retaddr_sproc_|  | <-- gr1 (at start)
 539        |____________|<-msp 0 <-----------mfp_dummy_____|  |
 540        |            |  (at start)     |  save regs     |  |
 541        | arg_slop   |                 |  pc0,pc1       |  |
 542        |            |                 |  pc2,lr0 sproc |  |
 543        | (16 words) |                 | gr96-gr124     |  |
 544        |____________|<-msp 1--after   | sr160-sr162    |  |
 545        |            | PUSH_DUMMY_FRAME| sr128-sr135    |  |
 546        | struct ret |                 |________________|  |
 547        | 17+        |                 |                |  |
 548        |____________|<- lrp           | args_out_dummy |  |
 549        | struct ret |                 |  (16 words)    |  |
 550        | 16         |                 |________________|  |
 551        | (16 words) |                 |____lr1_dummy___|--+
 552        |____________|<- msp 2--after  |_retaddr_dummy__|<- gr1 after
 553        |            | struct ret      |                |   PUSH_DUMMY_FRAME
 554        | margs17+   | area allocated  |  locals_inf    |
 555        |            |                 |________________|    called
 556        |____________|<- msp 4--when   |                |    function's
 557        |            |   inf called    | args_out_inf   |    frame (set up
 558        | margs16    |                 |________________|    by called
 559        | (16 words) |                 |_____lr1_inf____|    function).
 560        |____________|<- msp 3--after  |       .        |
 561        |            |   args pushed   |       .        |
 562        |            |                 |       .        |
 563                                       |                |
 564
 565    arg_slop: This area is so that when the call dummy adds 16 words to
 566       the msp, it won't end up larger than mfp_dummy (it is needed in the
 567       case where margs and struct_ret do not add up to at least 16 words).
 568    struct ret:  This area is allocated by GDB if the return value is more
 569       than 16 words.  struct ret_16 is not used on the a29k.
 570    margs:  Pushed by GDB.  The call dummy copies the first 16 words to
 571       args_out_dummy.
 572    retaddr_sproc:  Contains the PC at the time we call the function.
 573       set by PUSH_DUMMY_FRAME and read by POP_FRAME.
 574    retaddr_dummy:  This points to a breakpoint instruction in the dummy.  */
 575 \f
 576 /* Rsize for dummy frame, in bytes.  */
 577
 578 /* Bytes for outgoing args, lr1, and retaddr.  */
 579 #define DUMMY_ARG (2 * 4 + 16 * 4)
 580
 581 /* Number of special registers (sr128-) to save.  */
 582 #define DUMMY_SAVE_SR128 8
 583 /* Number of special registers (sr160-) to save.  */
 584 #define DUMMY_SAVE_SR160 3
 585 /* Number of general (gr96- or gr64-) registers to save.  */
 586 #define DUMMY_SAVE_GREGS 29
 587
 588 #define DUMMY_FRAME_RSIZE \
 589 (4 /* mfp_dummy */        \
 590  + 4 * 4  /* pc0, pc1, pc2, lr0 */  \
 591  + DUMMY_SAVE_GREGS * 4   \
 592  + DUMMY_SAVE_SR160 * 4   \
 593  + DUMMY_SAVE_SR128 * 4   \
 594  + DUMMY_ARG              \
 595  + 4 /* pad to doubleword */ )
 596
 597 /* Push an empty stack frame, to record the current PC, etc.  */
 598
 599 #define PUSH_DUMMY_FRAME push_dummy_frame()
 600 extern void push_dummy_frame ();
 601
 602 /* Discard from the stack the innermost frame,
 603    restoring all saved registers.  */
 604
 605 #define POP_FRAME pop_frame()
 606 extern void pop_frame ();
 607
 608 /* This sequence of words is the instructions
 609    mtsrim cr, 15
 610    loadm 0, 0, lr2, msp     ; load first 16 words of arguments into registers
 611    add msp, msp, 16 * 4     ; point to the remaining arguments
 612  CONST_INSN:
 613    const lr0,inf                ; (replaced by       half of target addr)
 614    consth lr0,inf               ; (replaced by other half of target addr)
 615    calli lr0, lr0
 616    aseq 0x40,gr1,gr1   ; nop
 617  BREAKPT_INSN:
 618    asneq 0x50,gr1,gr1  ; breakpoint     (replaced by local breakpoint insn)
 619    */
 620
 621 #if TARGET_BYTE_ORDER == HOST_BYTE_ORDER
 622 #define BS(const)       const
 623 #else
 624 #define BS(const)       (((const) & 0xff) << 24) |      \
 625                         (((const) & 0xff00) << 8) |     \
 626                         (((const) & 0xff0000) >> 8) |   \
 627                         (((const) & 0xff000000) >> 24)
 628 #endif
 629
 630 /* Position of the "const" and blkt instructions within CALL_DUMMY in bytes. */
 631 #define CONST_INSN (3 * 4)
 632 #define BREAKPT_INSN (7 * 4)
 633 #define CALL_DUMMY {    \
 634                 BS(0x0400870f),\
 635                 BS(0x36008200|(MSP_HW_REGNUM)), \
 636                 BS(0x15000040|(MSP_HW_REGNUM<<8)|(MSP_HW_REGNUM<<16)), \
 637                 BS(0x03ff80ff), \
 638                 BS(0x02ff80ff), \
 639                 BS(0xc8008080), \
 640                 BS(0x70400101), \
 641                 BS(0x72500101)}
 642 #define CALL_DUMMY_LENGTH (8 * 4)
 643
 644 #define CALL_DUMMY_START_OFFSET 0  /* Start execution at beginning of dummy */
 645
 646 /* Helper macro for FIX_CALL_DUMMY.  WORDP is a long * which points to a
 647    word in target byte order; bits 0-7 and 16-23 of *WORDP are replaced with
 648    bits 0-7 and 8-15 of DATA (which is in host byte order).  */
 649
 650 #if TARGET_BYTE_ORDER == BIG_ENDIAN
 651 #define STUFF_I16(WORDP, DATA) \
 652   { \
 653     *((char *)(WORDP) + 3) = ((DATA) & 0xff);\
 654     *((char *)(WORDP) + 1) = (((DATA) >> 8) & 0xff);\
 655   }
 656 #else /* Target is little endian.  */
 657 #define STUFF_I16(WORDP, DATA) \
 658   {
 659     *(char *)(WORDP) = ((DATA) & 0xff);
 660     *((char *)(WORDP) + 2) = (((DATA) >> 8) & 0xff);
 661   }
 662 #endif /* Target is little endian.  */
 663
 664 /* Insert the specified number of args and function address
 665    into a call sequence of the above form stored at DUMMYNAME.  */
 666
 667 /* Currently this stuffs in the address of the function that we are calling.
 668    Since different a29k systems use different breakpoint instructions, it
 669    also stuffs BREAKPOINT in the right place (to avoid having to
 670    duplicate CALL_DUMMY in each tm-*.h file).  */
 671
 672 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   \
 673   {\
 674     STUFF_I16((char *)dummyname + CONST_INSN, fun);             \
 675     STUFF_I16((char *)dummyname + CONST_INSN + 4, fun >> 16);   \
 676   /* FIXME  memcpy ((char *)(dummyname) + BREAKPT_INSN, break_insn, 4); */ \
 677   }
 678
 679 /* a29k architecture has separate data & instruction memories -- wired to
 680    different pins on the chip -- and can't execute the data memory.
 681    Also, there should be space after text_end;
 682    we won't get a SIGSEGV or scribble on data space.  */
 683
 684 #define CALL_DUMMY_LOCATION AFTER_TEXT_END
 685
 686 /* Because of this, we need (as a kludge) to know the addresses of the
 687    text section.  */
 688
 689 #define NEED_TEXT_START_END
 690
 691 /* How to translate register numbers in the .stab's into gdb's internal register
 692    numbers.  We don't translate them, but we warn if an invalid register
 693    number is seen.  Note that FIXME, we use the value "sym" as an implicit
 694    argument in printing the error message.  It happens to be available where
 695    this macro is used.  (This macro definition appeared in a late revision
 696    of gdb-3.91.6 and is not well tested.  Also, it should be a "complaint".) */
 697
 698 #define STAB_REG_TO_REGNUM(num) \
 699         (((num) > LR0_REGNUM + 127) \
 700            ? fprintf(stderr,    \
 701                 "Invalid register number %d in symbol table entry for %s\n", \
 702                  (num), SYMBOL_SOURCE_NAME (sym)), (num)        \
 703            : (num))
 704
 705 extern enum a29k_processor_types {
 706   a29k_unknown,
 707
 708   /* Bit 0x400 of the CPS does *not* identify freeze mode, i.e. 29000,
 709      29030, etc.  */
 710   a29k_no_freeze_mode,
 711
 712   /* Bit 0x400 of the CPS does identify freeze mode, i.e. 29050.  */
 713   a29k_freeze_mode
 714 } processor_type;
 715
 716 /* We need three arguments for a general frame specification for the
 717    "frame" or "info frame" command.  */
 718
 719 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
 720 /* FIXME:  Depends on equivalence between FRAME and "struct frame_info *",
 721    and equivalence between CORE_ADDR and FRAME_ADDR. */
 722 extern struct frame_info *setup_arbitrary_frame PARAMS ((int, CORE_ADDR *));