gdb/config/a29k/tm-a29k.h

   1 /* Parameters for target machine AMD 29000, for GDB, the GNU debugger.
   2    Copyright 1990, 1991, 1993, 1994, 1995, 1996, 1998, 1999, 2000,
   3    2001 Free Software Foundation, Inc.
   4    Contributed by Cygnus Support.  Written by Jim Kingdon.
   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 2 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, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include "regcache.h"
  24
  25 /* Parameters for an EB29K (a board which plugs into a PC and is
  26    accessed through EBMON software running on the PC, which we
  27    use as we'd use a remote stub (see remote-eb.c).
  28
  29    If gdb is ported to other a29k machines/systems, the
  30    machine/system-specific parts should be removed from this file (a
  31    la tm-m68k.h).  */
  32
  33 /* Byte order is configurable, but this machine runs big-endian.  */
  34 #define TARGET_BYTE_ORDER BFD_ENDIAN_BIG
  35
  36 /* Floating point uses IEEE representations.  */
  37 #define IEEE_FLOAT (1)
  38
  39 /* Recognize our magic number.  */
  40 #define BADMAG(x) ((x).f_magic != 0572)
  41
  42 /* Offset from address of function to start of its code.
  43    Zero on most machines.  */
  44
  45 #define FUNCTION_START_OFFSET 0
  46
  47 /* Advance PC across any function entry prologue instructions
  48    to reach some "real" code.  */
  49
  50 #define SKIP_PROLOGUE(pc) (a29k_skip_prologue (pc))
  51 CORE_ADDR a29k_skip_prologue ();
  52
  53 /* Immediately after a function call, return the saved pc.
  54    Can't go through the frames for this because on some machines
  55    the new frame is not set up until the new function executes
  56    some instructions.  */
  57
  58 #define SAVED_PC_AFTER_CALL(frame) ((frame->flags & TRANSPARENT_FRAME) \
  59                                     ? read_register (TPC_REGNUM) \
  60                                     : read_register (LR0_REGNUM))
  61
  62 /* Stack grows downward.  */
  63
  64 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  65
  66 /* Stack must be aligned on 32-bit boundaries when synthesizing
  67    function calls. */
  68
  69 #define STACK_ALIGN(ADDR) (((ADDR) + 3) & ~3)
  70
  71 /* Sequence of bytes for breakpoint instruction.  */
  72 /* ASNEQ 0x50, gr1, gr1
  73    The trap number 0x50 is chosen arbitrarily.
  74    We let the command line (or previously included files) override this
  75    setting.  */
  76 #ifndef BREAKPOINT
  77 #if TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
  78 #define BREAKPOINT {0x72, 0x50, 0x01, 0x01}
  79 #else /* Target is little-endian.  */
  80 #define BREAKPOINT {0x01, 0x01, 0x50, 0x72}
  81 #endif /* Target is little-endian.  */
  82 #endif /* BREAKPOINT */
  83
  84 /* Amount PC must be decremented by after a breakpoint.
  85    This is often the number of bytes in BREAKPOINT
  86    but not always.  */
  87
  88 #define DECR_PC_AFTER_BREAK 0
  89
  90 /* Say how long (ordinary) registers are.  This is a piece of bogosity
  91    used in push_word and a few other places; REGISTER_RAW_SIZE is the
  92    real way to know how big a register is.  */
  93
  94 #define REGISTER_SIZE 4
  95
  96 /* Allow the register declarations here to be overridden for remote
  97    kernel debugging.  */
  98 #if !defined (REGISTER_NAMES)
  99
 100 /* Number of machine registers */
 101
 102 #define NUM_REGS 205
 103
 104 /* Initializer for an array of names of registers.
 105    There should be NUM_REGS strings in this initializer.
 106
 107    FIXME, add floating point registers and support here.
 108
 109    Also note that this list does not attempt to deal with kernel
 110    debugging (in which the first 32 registers are gr64-gr95).  */
 111
 112 #define REGISTER_NAMES \
 113 {"gr96", "gr97", "gr98", "gr99", "gr100", "gr101", "gr102", "gr103", "gr104", \
 114  "gr105", "gr106", "gr107", "gr108", "gr109", "gr110", "gr111", "gr112", \
 115  "gr113", "gr114", "gr115", "gr116", "gr117", "gr118", "gr119", "gr120", \
 116  "gr121", "gr122", "gr123", "gr124", "gr125", "gr126", "gr127",          \
 117  "lr0", "lr1", "lr2", "lr3", "lr4", "lr5", "lr6", "lr7", "lr8", "lr9",   \
 118  "lr10", "lr11", "lr12", "lr13", "lr14", "lr15", "lr16", "lr17", "lr18", \
 119  "lr19", "lr20", "lr21", "lr22", "lr23", "lr24", "lr25", "lr26", "lr27", \
 120  "lr28", "lr29", "lr30", "lr31", "lr32", "lr33", "lr34", "lr35", "lr36", \
 121  "lr37", "lr38", "lr39", "lr40", "lr41", "lr42", "lr43", "lr44", "lr45", \
 122  "lr46", "lr47", "lr48", "lr49", "lr50", "lr51", "lr52", "lr53", "lr54", \
 123  "lr55", "lr56", "lr57", "lr58", "lr59", "lr60", "lr61", "lr62", "lr63", \
 124  "lr64", "lr65", "lr66", "lr67", "lr68", "lr69", "lr70", "lr71", "lr72", \
 125  "lr73", "lr74", "lr75", "lr76", "lr77", "lr78", "lr79", "lr80", "lr81", \
 126  "lr82", "lr83", "lr84", "lr85", "lr86", "lr87", "lr88", "lr89", "lr90", \
 127  "lr91", "lr92", "lr93", "lr94", "lr95", "lr96", "lr97", "lr98", "lr99", \
 128  "lr100", "lr101", "lr102", "lr103", "lr104", "lr105", "lr106", "lr107", \
 129  "lr108", "lr109", "lr110", "lr111", "lr112", "lr113", "lr114", "lr115", \
 130  "lr116", "lr117", "lr118", "lr119", "lr120", "lr121", "lr122", "lr123", \
 131  "lr124", "lr125", "lr126", "lr127",                                     \
 132   "AI0", "AI1", "AI2", "AI3", "AI4", "AI5", "AI6", "AI7", "AI8", "AI9",  \
 133   "AI10", "AI11", "AI12", "AI13", "AI14", "AI15", "FP",                  \
 134   "bp", "fc", "cr", "q",                                                 \
 135   "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr",  \
 136   "pc0", "pc1", "pc2", "mmu", "lru", "fpe", "inte", "fps", "exo", "gr1",  \
 137   "alu", "ipc", "ipa", "ipb" }
 138
 139 /*
 140  * Converts an sdb register number to an internal gdb register number.
 141  * Currently under epi, gr96->0...gr127->31...lr0->32...lr127->159, or...
 142  *                      gr64->0...gr95->31, lr0->32...lr127->159.
 143  */
 144 #define SDB_REG_TO_REGNUM(value) \
 145   (((value) >= 96 && (value) <= 127) ? ((value) - 96) : \
 146    ((value) >= 128 && (value) <=  255) ? ((value) - 128 + LR0_REGNUM) : \
 147    (value))
 148
 149 /*
 150  * Provide the processor register numbers of some registers that are
 151  * expected/written in instructions that might change under different
 152  * register sets.  Namely, gcc can compile (-mkernel-registers) so that
 153  * it uses gr64-gr95 in stead of gr96-gr127.
 154  */
 155 #define MSP_HW_REGNUM   125     /* gr125 */
 156 #define RAB_HW_REGNUM   126     /* gr126 */
 157
 158 /* Convert Processor Special register #x to REGISTER_NAMES register # */
 159 #define SR_REGNUM(x) \
 160   ((x) < 15  ? VAB_REGNUM + (x)                                  \
 161    : (x) >= 128 && (x) < 131 ? IPC_REGNUM + (x) - 128            \
 162    : (x) == 131 ? Q_REGNUM                                       \
 163    : (x) == 132 ? ALU_REGNUM                                     \
 164    : (x) >= 133 && (x) < 136 ? BP_REGNUM + (x) - 133             \
 165    : (x) >= 160 && (x) < 163 ? FPE_REGNUM + (x) - 160            \
 166    : (x) == 164 ? EXO_REGNUM                                     \
 167    : (error ("Internal error in SR_REGNUM"), 0))
 168 #define GR96_REGNUM 0
 169
 170 /* Define the return register separately, so it can be overridden for
 171    kernel procedure calling conventions. */
 172 #define RETURN_REGNUM   GR96_REGNUM
 173 #define GR1_REGNUM 200
 174 /* This needs to be the memory stack pointer, not the register stack pointer,
 175    to make call_function work right.  */
 176 #define SP_REGNUM MSP_REGNUM
 177 #define FP_REGNUM 33            /* lr1 */
 178
 179 /* Return register for transparent calling convention (gr122).  */
 180 #define TPC_REGNUM (122 - 96 + GR96_REGNUM)
 181
 182 /* Large Return Pointer (gr123).  */
 183 #define LRP_REGNUM (123 - 96 + GR96_REGNUM)
 184
 185 /* Static link pointer (gr124).  */
 186 #define SLP_REGNUM (124 - 96 + GR96_REGNUM)
 187
 188 /* Memory Stack Pointer (gr125).  */
 189 #define MSP_REGNUM (125 - 96 + GR96_REGNUM)
 190
 191 /* Register allocate bound (gr126).  */
 192 #define RAB_REGNUM (126 - 96 + GR96_REGNUM)
 193
 194 /* Register Free Bound (gr127).  */
 195 #define RFB_REGNUM (127 - 96 + GR96_REGNUM)
 196
 197 /* Register Stack Pointer.  */
 198 #define RSP_REGNUM GR1_REGNUM
 199 #define LR0_REGNUM 32
 200 #define BP_REGNUM 177
 201 #define FC_REGNUM 178
 202 #define CR_REGNUM 179
 203 #define Q_REGNUM 180
 204 #define VAB_REGNUM 181
 205 #define OPS_REGNUM (VAB_REGNUM + 1)
 206 #define CPS_REGNUM (VAB_REGNUM + 2)
 207 #define CFG_REGNUM (VAB_REGNUM + 3)
 208 #define CHA_REGNUM (VAB_REGNUM + 4)
 209 #define CHD_REGNUM (VAB_REGNUM + 5)
 210 #define CHC_REGNUM (VAB_REGNUM + 6)
 211 #define RBP_REGNUM (VAB_REGNUM + 7)
 212 #define TMC_REGNUM (VAB_REGNUM + 8)
 213 #define TMR_REGNUM (VAB_REGNUM + 9)
 214 #define NPC_REGNUM (VAB_REGNUM + 10)    /* pc0 */
 215 #define PC_REGNUM  (VAB_REGNUM + 11)    /* pc1 */
 216 #define PC2_REGNUM (VAB_REGNUM + 12)
 217 #define MMU_REGNUM (VAB_REGNUM + 13)
 218 #define LRU_REGNUM (VAB_REGNUM + 14)
 219 #define FPE_REGNUM (VAB_REGNUM + 15)
 220 #define INTE_REGNUM (VAB_REGNUM + 16)
 221 #define FPS_REGNUM (VAB_REGNUM + 17)
 222 #define EXO_REGNUM (VAB_REGNUM + 18)
 223 /* gr1 is defined above as 200 = VAB_REGNUM + 19 */
 224 #define ALU_REGNUM (VAB_REGNUM + 20)
 225 #define PS_REGNUM  ALU_REGNUM
 226 #define IPC_REGNUM (VAB_REGNUM + 21)
 227 #define IPA_REGNUM (VAB_REGNUM + 22)
 228 #define IPB_REGNUM (VAB_REGNUM + 23)
 229
 230 #endif /* !defined(REGISTER_NAMES) */
 231
 232 /* Total amount of space needed to store our copies of the machine's
 233    register state, the array `registers'.  */
 234 #define REGISTER_BYTES (NUM_REGS * 4)
 235
 236 /* Index within `registers' of the first byte of the space for
 237    register N.  */
 238 #define REGISTER_BYTE(N)  ((N)*4)
 239
 240 /* Number of bytes of storage in the actual machine representation
 241    for register N.  */
 242
 243 /* All regs are 4 bytes.  */
 244
 245 #define REGISTER_RAW_SIZE(N) (4)
 246
 247 /* Number of bytes of storage in the program's representation
 248    for register N.  */
 249
 250 /* All regs are 4 bytes.  */
 251
 252 #define REGISTER_VIRTUAL_SIZE(N) (4)
 253
 254 /* Largest value REGISTER_RAW_SIZE can have.  */
 255
 256 #define MAX_REGISTER_RAW_SIZE (4)
 257
 258 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 259
 260 #define MAX_REGISTER_VIRTUAL_SIZE (4)
 261
 262 /* Return the GDB type object for the "standard" data type
 263    of data in register N.  */
 264
 265 #define REGISTER_VIRTUAL_TYPE(N) \
 266   (((N) == PC_REGNUM || (N) == LRP_REGNUM || (N) == SLP_REGNUM         \
 267     || (N) == MSP_REGNUM || (N) == RAB_REGNUM || (N) == RFB_REGNUM     \
 268     || (N) == GR1_REGNUM || (N) == FP_REGNUM || (N) == LR0_REGNUM       \
 269     || (N) == NPC_REGNUM || (N) == PC2_REGNUM)                           \
 270    ? lookup_pointer_type (builtin_type_void) : builtin_type_int)
 271 \f
 272 /* Store the address of the place in which to copy the structure the
 273    subroutine will return.  This is called from call_function. */
 274 /* On the a29k the LRP points to the part of the structure beyond the first
 275    16 words.  */
 276 #define STORE_STRUCT_RETURN(ADDR, SP) \
 277   write_register (LRP_REGNUM, (ADDR) + 16 * 4);
 278
 279 /* Should call_function allocate stack space for a struct return?  */
 280 /* On the a29k objects over 16 words require the caller to allocate space.  */
 281 extern use_struct_convention_fn a29k_use_struct_convention;
 282 #define USE_STRUCT_CONVENTION(gcc_p, type) a29k_use_struct_convention (gcc_p, type)
 283
 284 /* Extract from an array REGBUF containing the (raw) register state
 285    a function return value of type TYPE, and copy that, in virtual format,
 286    into VALBUF.  */
 287
 288 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF)              \
 289   {                                                                        \
 290     int reg_length = TYPE_LENGTH (TYPE);                                   \
 291     if (reg_length > 16 * 4)                                               \
 292       {                                                                    \
 293         reg_length = 16 * 4;                                               \
 294         read_memory (*((int *)(REGBUF) + LRP_REGNUM), (VALBUF) + 16 * 4,   \
 295                      TYPE_LENGTH (TYPE) - 16 * 4);                         \
 296       }                                                                    \
 297     memcpy ((VALBUF), ((int *)(REGBUF))+RETURN_REGNUM, reg_length);        \
 298   }
 299
 300 /* Write into appropriate registers a function return value
 301    of type TYPE, given in virtual format.  */
 302
 303 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 304   {                                                                       \
 305     int reg_length = TYPE_LENGTH (TYPE);                                  \
 306     if (reg_length > 16 * 4)                                              \
 307       {                                                                   \
 308         reg_length = 16 * 4;                                              \
 309         write_memory (read_register (LRP_REGNUM),                         \
 310                       (char *)(VALBUF) + 16 * 4,                          \
 311                       TYPE_LENGTH (TYPE) - 16 * 4);                       \
 312       }                                                                   \
 313     write_register_bytes (REGISTER_BYTE (RETURN_REGNUM), (char *)(VALBUF),  \
 314                           TYPE_LENGTH (TYPE));                            \
 315   }
 316 \f/* *INDENT-OFF* */
 317 /* The a29k user's guide documents well what the stacks look like.
 318    But what isn't so clear there is how this interracts with the
 319    symbols, or with GDB.
 320    In the following saved_msp, saved memory stack pointer (which functions
 321    as a memory frame pointer), means either
 322    a register containing the memory frame pointer or, in the case of
 323    functions with fixed size memory frames (i.e. those who don't use
 324    alloca()), the result of the calculation msp + msize.
 325
 326    LOC_ARG, LOC_LOCAL - For GCC, these are relative to saved_msp.
 327    For high C, these are relative to msp (making alloca impossible).
 328    LOC_REGISTER, LOC_REGPARM - The register number is the number at the
 329    time the function is running (after the prologue), or in the case
 330    of LOC_REGPARM, may be a register number in the range 160-175.
 331
 332    The compilers do things like store an argument into memory, and then put out
 333    a LOC_ARG for it, or put it into global registers and put out a
 334    LOC_REGPARM.  Thus is it important to execute the first line of
 335    code (i.e. the line of the open brace, i.e. the prologue) of a function
 336    before trying to print arguments or anything.
 337
 338    The following diagram attempts to depict what is going on in memory
 339    (see also the _a29k user's guide_) and also how that interacts with
 340    GDB frames.  We arbitrarily pick fci->frame to point the same place
 341    as the register stack pointer; since we set it ourself in
 342    INIT_EXTRA_FRAME_INFO, and access it only through the FRAME_*
 343    macros, it doesn't really matter exactly how we
 344    do it.  However, note that FRAME_FP is used in two ways in GDB:
 345    (1) as a "magic cookie" which uniquely identifies frames (even over
 346    calls to the inferior), (2) (in PC_IN_CALL_DUMMY [ON_STACK])
 347    as the value of SP_REGNUM before the dummy frame was pushed.  These
 348    two meanings would be incompatible for the a29k if we defined
 349    CALL_DUMMY_LOCATION == ON_STACK (but we don't, so don't worry about it).
 350    Also note that "lr1" below, while called a frame pointer
 351    in the user's guide, has only one function:  To determine whether
 352    registers need to be filled in the function epilogue.
 353
 354    Consider the code:
 355    < call bar>
 356    loc1: . . .
 357    bar:  sub gr1,gr1,rsize_b
 358    . . .
 359    add mfp,msp,0
 360    sub msp,msp,msize_b
 361    . . .
 362    < call foo >
 363    loc2: . . .
 364    foo:  sub gr1,gr1,rsize_f
 365    . . .
 366    add mfp,msp,0
 367    sub msp,msp,msize_f
 368    . . .
 369    loc3: < suppose the inferior stops here >
 370
 371    memory stack      register stack
 372    |           |     |____________|
 373    |           |     |____loc1____|
 374    +------->|___________|     |            |   ^
 375    |        | ^         |     |  locals_b  |   |
 376    |        | |         |     |____________|   |
 377    |        | |         |     |            |   | rsize_b
 378    |        | | msize_b |     | args_to_f  |   |
 379    |        | |         |     |____________|   |
 380    |        | |         |     |____lr1_____|   V
 381    |        | V         |     |____loc2____|<----------------+
 382    |   +--->|___________|<---------mfp     |   ^             |
 383    |   |    | ^         |     |  locals_f  |   |             |
 384    |   |    | | msize_f |     |____________|   |             |
 385    |   |    | |         |     |            |   | rsize_f     |
 386    |   |    | V         |     |   args     |   |             |
 387    |   |    |___________|<msp |____________|   |             |
 388    |   |                      |_____lr1____|   V             |
 389    |   |                      |___garbage__| <- gr1 <----+   |
 390    |   |                                                |   |
 391    |   |                                                |   |
 392    |   |                             pc=loc3                    |   |
 393    |   |                                                |   |
 394    |   |                                                |   |
 395    |   |            frame cache                         |   |
 396    |   |       |_________________|                      |   |
 397    |   |       |rsize=rsize_b    |                      |   |
 398    |   |       |msize=msize_b    |                      |   |
 399    +---|--------saved_msp        |                      |   |
 400    |       |frame------------------------------------|---+
 401    |       |pc=loc2          |                       |
 402    |       |_________________|                       |
 403    |       |rsize=rsize_f    |                       |
 404    |       |msize=msize_f    |                       |
 405    +--------saved_msp        |                       |
 406    |frame------------------------------------+
 407    |pc=loc3          |
 408    |_________________|
 409
 410    So, is that sufficiently confusing?  Welcome to the 29000.
 411    Notes:
 412    * The frame for foo uses a memory frame pointer but the frame for
 413    bar does not.  In the latter case the saved_msp is
 414    computed by adding msize to the saved_msp of the
 415    next frame.
 416    * msize is in the frame cache only for high C's sake.  */
 417 /* *INDENT-ON* */
 418
 419
 420 void read_register_stack ();
 421 long read_register_stack_integer ();
 422 \f
 423 #define FRAME_INIT_SAVED_REGS(fi)       /*no-op */
 424
 425 #define EXTRA_FRAME_INFO  \
 426   CORE_ADDR saved_msp;    \
 427   unsigned int rsize;     \
 428   unsigned int msize;     \
 429   unsigned char flags;
 430
 431 /* Bits for flags in EXTRA_FRAME_INFO */
 432 #define TRANSPARENT_FRAME       0x1     /* This is a transparent frame */
 433 #define MFP_USED                0x2     /* A memory frame pointer is used */
 434
 435 /* Because INIT_FRAME_PC gets passed fromleaf, that's where we init
 436    not only ->pc and ->frame, but all the extra stuff, when called from
 437    get_prev_frame, that is.  */
 438 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci)  init_extra_frame_info(fci)
 439 void init_extra_frame_info ();
 440
 441 #define INIT_FRAME_PC(fromleaf, fci) init_frame_pc(fromleaf, fci)
 442 void init_frame_pc ();
 443 \f
 444
 445 /* FRAME_CHAIN takes a FRAME
 446    and produces the frame's chain-pointer.
 447
 448    However, if FRAME_CHAIN_VALID returns zero,
 449    it means the given frame is the outermost one and has no caller.  */
 450
 451 /* On the a29k, the nominal address of a frame is the address on the
 452    register stack of the return address (the one next to the incoming
 453    arguments, not down at the bottom so nominal address == stack pointer).
 454
 455    GDB expects "nominal address" to equal contents of FP_REGNUM,
 456    at least when it comes time to create the innermost frame.
 457    However, that doesn't work for us, so when creating the innermost
 458    frame we set ->frame ourselves in INIT_EXTRA_FRAME_INFO.  */
 459
 460 /* These are mostly dummies for the a29k because INIT_FRAME_PC
 461    sets prev->frame instead.  */
 462 /* If rsize is zero, we must be at end of stack (or otherwise hosed).
 463    If we don't check rsize, we loop forever if we see rsize == 0.  */
 464 #define FRAME_CHAIN(thisframe) \
 465   ((thisframe)->rsize == 0 \
 466    ? 0 \
 467    : (thisframe)->frame + (thisframe)->rsize)
 468
 469 /* Determine if the frame has a 'previous' and back-traceable frame. */
 470 #define FRAME_IS_UNCHAINED(frame)       ((frame)->flags & TRANSPARENT_FRAME)
 471
 472 /* Find the previous frame of a transparent routine.
 473  * For now lets not try and trace through a transparent routine (we might
 474  * have to assume that all transparent routines are traps).
 475  */
 476 #define FIND_PREV_UNCHAINED_FRAME(frame)        0
 477
 478 /* Define other aspects of the stack frame.  */
 479
 480 /* An expression that tells us whether the function invocation represented
 481    by FI does not have a frame on the stack associated with it. */
 482 #define FRAMELESS_FUNCTION_INVOCATION(FI) \
 483   (frameless_look_for_prologue (FI))
 484
 485 /* Saved pc (i.e. return address).  */
 486 #define FRAME_SAVED_PC(fraim) \
 487   (read_register_stack_integer ((fraim)->frame + (fraim)->rsize, 4))
 488
 489 /* Local variables (i.e. LOC_LOCAL) are on the memory stack, with their
 490    offsets being relative to the memory stack pointer (high C) or
 491    saved_msp (gcc).  */
 492
 493 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address (fi)
 494 extern CORE_ADDR frame_locals_address ();
 495
 496 /* Return number of args passed to a frame.
 497    Can return -1, meaning no way to tell.  */
 498 /* We tried going to the effort of finding the tags word and getting
 499    the argcount field from it, to support debugging assembler code.
 500    Problem was, the "argcount" field never did hold the argument
 501    count.  */
 502 #define FRAME_NUM_ARGS(fi) (-1)
 503
 504 #define FRAME_ARGS_ADDRESS(fi) FRAME_LOCALS_ADDRESS (fi)
 505
 506 /* Return number of bytes at start of arglist that are not really args.  */
 507
 508 #define FRAME_ARGS_SKIP 0
 509
 510 /* Provide our own get_saved_register.  HAVE_REGISTER_WINDOWS is insufficient
 511    because registers get renumbered on the a29k without getting saved.  */
 512
 513 struct frame_info;
 514 void a29k_get_saved_register (char *raw_buffer, int *optimized,
 515                               CORE_ADDR * addrp, struct frame_info *frame,
 516                               int regnum, enum lval_type *lvalp);
 517 #define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \
 518       a29k_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
 519 \f
 520 /* Call function stuff.  */
 521 /* *INDENT-OFF* */
 522 /* The dummy frame looks like this (see also the general frame picture
 523    above):
 524
 525                                         register stack
 526
 527                                       |                |  frame for function
 528                                       |   locals_sproc |  executing at time
 529                                       |________________|  of call_function.
 530                                       |                |  We must not disturb
 531                                       | args_out_sproc |  it.
 532         memory stack                  |________________|
 533                                       |____lr1_sproc___|<-+
 534        |            |                 |__retaddr_sproc_|  | <-- gr1 (at start)
 535        |____________|<-msp 0 <-----------mfp_dummy_____|  |
 536        |            |  (at start)     |  save regs     |  |
 537        | arg_slop   |                 |  pc0,pc1       |  |
 538        |            |                 |  pc2,lr0 sproc |  |
 539        | (16 words) |                 | gr96-gr124     |  |
 540        |____________|<-msp 1--after   | sr160-sr162    |  |
 541        |            | PUSH_DUMMY_FRAME| sr128-sr135    |  |
 542        | struct ret |                 |________________|  |
 543        | 17+        |                 |                |  |
 544        |____________|<- lrp           | args_out_dummy |  |
 545        | struct ret |                 |  (16 words)    |  |
 546        | 16         |                 |________________|  |
 547        | (16 words) |                 |____lr1_dummy___|--+
 548        |____________|<- msp 2--after  |_retaddr_dummy__|<- gr1 after
 549        |            | struct ret      |                |   PUSH_DUMMY_FRAME
 550        | margs17+   | area allocated  |  locals_inf    |
 551        |            |                 |________________|    called
 552        |____________|<- msp 4--when   |                |    function's
 553        |            |   inf called    | args_out_inf   |    frame (set up
 554        | margs16    |                 |________________|    by called
 555        | (16 words) |                 |_____lr1_inf____|    function).
 556        |____________|<- msp 3--after  |       .        |
 557        |            |   args pushed   |       .        |
 558        |            |                 |       .        |
 559                                       |                |
 560
 561    arg_slop: This area is so that when the call dummy adds 16 words to
 562       the msp, it won't end up larger than mfp_dummy (it is needed in the
 563       case where margs and struct_ret do not add up to at least 16 words).
 564    struct ret:  This area is allocated by GDB if the return value is more
 565       than 16 words.  struct ret_16 is not used on the a29k.
 566    margs:  Pushed by GDB.  The call dummy copies the first 16 words to
 567       args_out_dummy.
 568    retaddr_sproc:  Contains the PC at the time we call the function.
 569       set by PUSH_DUMMY_FRAME and read by POP_FRAME.
 570    retaddr_dummy:  This points to a breakpoint instruction in the dummy.  */
 571 /* *INDENT-ON* */
 572 \f
 573
 574
 575 /* Rsize for dummy frame, in bytes.  */
 576
 577 /* Bytes for outgoing args, lr1, and retaddr.  */
 578 #define DUMMY_ARG (2 * 4 + 16 * 4)
 579
 580 /* Number of special registers (sr128-) to save.  */
 581 #define DUMMY_SAVE_SR128 8
 582 /* Number of special registers (sr160-) to save.  */
 583 #define DUMMY_SAVE_SR160 3
 584 /* Number of general (gr96- or gr64-) registers to save.  */
 585 #define DUMMY_SAVE_GREGS 29
 586
 587 #define DUMMY_FRAME_RSIZE \
 588 (4 /* mfp_dummy */        \
 589  + 4 * 4  /* pc0, pc1, pc2, lr0 */  \
 590  + DUMMY_SAVE_GREGS * 4   \
 591  + DUMMY_SAVE_SR160 * 4   \
 592  + DUMMY_SAVE_SR128 * 4   \
 593  + DUMMY_ARG              \
 594  + 4 /* pad to doubleword */ )
 595
 596 /* Push an empty stack frame, to record the current PC, etc.  */
 597
 598 #define PUSH_DUMMY_FRAME push_dummy_frame()
 599 extern void push_dummy_frame ();
 600
 601 /* Discard from the stack the innermost frame,
 602    restoring all saved registers.  */
 603
 604 #define POP_FRAME pop_frame()
 605 extern void pop_frame ();
 606
 607 /* This sequence of words is the instructions
 608    mtsrim cr, 15
 609    loadm 0, 0, lr2, msp     ; load first 16 words of arguments into registers
 610    add msp, msp, 16 * 4     ; point to the remaining arguments
 611    CONST_INSN:
 612    const lr0,inf                ; (replaced by       half of target addr)
 613    consth lr0,inf               ; (replaced by other half of target addr)
 614    calli lr0, lr0
 615    aseq 0x40,gr1,gr1   ; nop
 616    BREAKPT_INSN:
 617    asneq 0x50,gr1,gr1  ; breakpoint     (replaced by local breakpoint insn)
 618  */
 619
 620 #error "This file is broken.  GDB does not define HOST_BYTE_ORDER."
 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 == BFD_ENDIAN_BIG
 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 1
 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 {
 707   a29k_unknown,
 708
 709   /* Bit 0x400 of the CPS does *not* identify freeze mode, i.e. 29000,
 710      29030, etc.  */
 711   a29k_no_freeze_mode,
 712
 713   /* Bit 0x400 of the CPS does identify freeze mode, i.e. 29050.  */
 714   a29k_freeze_mode
 715 }
 716 processor_type;
 717
 718 /* We need three arguments for a general frame specification for the
 719    "frame" or "info frame" command.  */
 720
 721 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
 722 extern struct frame_info *setup_arbitrary_frame (int, CORE_ADDR *);