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    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 /* Parameters for an EB29K (a board which plugs into a PC and is
  24    accessed through EBMON software running on the PC, which we
  25    use as we'd use a remote stub (see remote-eb.c).
  26
  27    If gdb is ported to other a29k machines/systems, the
  28    machine/system-specific parts should be removed from this file (a
  29    la tm-m68k.h).  */
  30
  31 /* Byte order is configurable, but this machine runs big-endian.  */
  32 #define TARGET_BYTE_ORDER BIG_ENDIAN
  33
  34 /* Floating point uses IEEE representations.  */
  35 #define IEEE_FLOAT (1)
  36
  37 /* Recognize our magic number.  */
  38 #define BADMAG(x) ((x).f_magic != 0572)
  39
  40 /* Offset from address of function to start of its code.
  41    Zero on most machines.  */
  42
  43 #define FUNCTION_START_OFFSET 0
  44
  45 /* Advance PC across any function entry prologue instructions
  46    to reach some "real" code.  */
  47
  48 #define SKIP_PROLOGUE(pc) (a29k_skip_prologue (pc))
  49 CORE_ADDR a29k_skip_prologue ();
  50
  51 /* Immediately after a function call, return the saved pc.
  52    Can't go through the frames for this because on some machines
  53    the new frame is not set up until the new function executes
  54    some instructions.  */
  55
  56 #define SAVED_PC_AFTER_CALL(frame) ((frame->flags & TRANSPARENT_FRAME) \
  57                                     ? read_register (TPC_REGNUM) \
  58                                     : read_register (LR0_REGNUM))
  59
  60 /* Stack grows downward.  */
  61
  62 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  63
  64 /* Stack must be aligned on 32-bit boundaries when synthesizing
  65    function calls. */
  66
  67 #define STACK_ALIGN(ADDR) (((ADDR) + 3) & ~3)
  68
  69 /* Sequence of bytes for breakpoint instruction.  */
  70 /* ASNEQ 0x50, gr1, gr1
  71    The trap number 0x50 is chosen arbitrarily.
  72    We let the command line (or previously included files) override this
  73    setting.  */
  74 #ifndef BREAKPOINT
  75 #if TARGET_BYTE_ORDER == BIG_ENDIAN
  76 #define BREAKPOINT {0x72, 0x50, 0x01, 0x01}
  77 #else /* Target is little-endian.  */
  78 #define BREAKPOINT {0x01, 0x01, 0x50, 0x72}
  79 #endif /* Target is little-endian.  */
  80 #endif /* BREAKPOINT */
  81
  82 /* Amount PC must be decremented by after a breakpoint.
  83    This is often the number of bytes in BREAKPOINT
  84    but not always.  */
  85
  86 #define DECR_PC_AFTER_BREAK 0
  87
  88 /* Say how long (ordinary) registers are.  This is a piece of bogosity
  89    used in push_word and a few other places; REGISTER_RAW_SIZE is the
  90    real way to know how big a register is.  */
  91
  92 #define REGISTER_SIZE 4
  93
  94 /* Allow the register declarations here to be overridden for remote
  95    kernel debugging.  */
  96 #if !defined (REGISTER_NAMES)
  97
  98 /* Number of machine registers */
  99
 100 #define NUM_REGS 205
 101
 102 /* Initializer for an array of names of registers.
 103    There should be NUM_REGS strings in this initializer.
 104
 105    FIXME, add floating point registers and support here.
 106
 107    Also note that this list does not attempt to deal with kernel
 108    debugging (in which the first 32 registers are gr64-gr95).  */
 109
 110 #define REGISTER_NAMES \
 111 {"gr96", "gr97", "gr98", "gr99", "gr100", "gr101", "gr102", "gr103", "gr104", \
 112  "gr105", "gr106", "gr107", "gr108", "gr109", "gr110", "gr111", "gr112", \
 113  "gr113", "gr114", "gr115", "gr116", "gr117", "gr118", "gr119", "gr120", \
 114  "gr121", "gr122", "gr123", "gr124", "gr125", "gr126", "gr127",          \
 115  "lr0", "lr1", "lr2", "lr3", "lr4", "lr5", "lr6", "lr7", "lr8", "lr9",   \
 116  "lr10", "lr11", "lr12", "lr13", "lr14", "lr15", "lr16", "lr17", "lr18", \
 117  "lr19", "lr20", "lr21", "lr22", "lr23", "lr24", "lr25", "lr26", "lr27", \
 118  "lr28", "lr29", "lr30", "lr31", "lr32", "lr33", "lr34", "lr35", "lr36", \
 119  "lr37", "lr38", "lr39", "lr40", "lr41", "lr42", "lr43", "lr44", "lr45", \
 120  "lr46", "lr47", "lr48", "lr49", "lr50", "lr51", "lr52", "lr53", "lr54", \
 121  "lr55", "lr56", "lr57", "lr58", "lr59", "lr60", "lr61", "lr62", "lr63", \
 122  "lr64", "lr65", "lr66", "lr67", "lr68", "lr69", "lr70", "lr71", "lr72", \
 123  "lr73", "lr74", "lr75", "lr76", "lr77", "lr78", "lr79", "lr80", "lr81", \
 124  "lr82", "lr83", "lr84", "lr85", "lr86", "lr87", "lr88", "lr89", "lr90", \
 125  "lr91", "lr92", "lr93", "lr94", "lr95", "lr96", "lr97", "lr98", "lr99", \
 126  "lr100", "lr101", "lr102", "lr103", "lr104", "lr105", "lr106", "lr107", \
 127  "lr108", "lr109", "lr110", "lr111", "lr112", "lr113", "lr114", "lr115", \
 128  "lr116", "lr117", "lr118", "lr119", "lr120", "lr121", "lr122", "lr123", \
 129  "lr124", "lr125", "lr126", "lr127",                                     \
 130   "AI0", "AI1", "AI2", "AI3", "AI4", "AI5", "AI6", "AI7", "AI8", "AI9",  \
 131   "AI10", "AI11", "AI12", "AI13", "AI14", "AI15", "FP",                  \
 132   "bp", "fc", "cr", "q",                                                 \
 133   "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr",  \
 134   "pc0", "pc1", "pc2", "mmu", "lru", "fpe", "inte", "fps", "exo", "gr1",  \
 135   "alu", "ipc", "ipa", "ipb" }
 136
 137 /*
 138  * Converts an sdb register number to an internal gdb register number.
 139  * Currently under epi, gr96->0...gr127->31...lr0->32...lr127->159, or...
 140  *                      gr64->0...gr95->31, lr0->32...lr127->159.
 141  */
 142 #define SDB_REG_TO_REGNUM(value) \
 143   (((value) >= 96 && (value) <= 127) ? ((value) - 96) : \
 144    ((value) >= 128 && (value) <=  255) ? ((value) - 128 + LR0_REGNUM) : \
 145    (value))
 146
 147 /*
 148  * Provide the processor register numbers of some registers that are
 149  * expected/written in instructions that might change under different
 150  * register sets.  Namely, gcc can compile (-mkernel-registers) so that
 151  * it uses gr64-gr95 in stead of gr96-gr127.
 152  */
 153 #define MSP_HW_REGNUM   125     /* gr125 */
 154 #define RAB_HW_REGNUM   126     /* gr126 */
 155
 156 /* Convert Processor Special register #x to REGISTER_NAMES register # */
 157 #define SR_REGNUM(x) \
 158   ((x) < 15  ? VAB_REGNUM + (x)                                  \
 159    : (x) >= 128 && (x) < 131 ? IPC_REGNUM + (x) - 128            \
 160    : (x) == 131 ? Q_REGNUM                                       \
 161    : (x) == 132 ? ALU_REGNUM                                     \
 162    : (x) >= 133 && (x) < 136 ? BP_REGNUM + (x) - 133             \
 163    : (x) >= 160 && (x) < 163 ? FPE_REGNUM + (x) - 160            \
 164    : (x) == 164 ? EXO_REGNUM                                     \
 165    : (error ("Internal error in SR_REGNUM"), 0))
 166 #define GR96_REGNUM 0
 167
 168 /* Define the return register separately, so it can be overridden for
 169    kernel procedure calling conventions. */
 170 #define RETURN_REGNUM   GR96_REGNUM
 171 #define GR1_REGNUM 200
 172 /* This needs to be the memory stack pointer, not the register stack pointer,
 173    to make call_function work right.  */
 174 #define SP_REGNUM MSP_REGNUM
 175 #define FP_REGNUM 33            /* lr1 */
 176
 177 /* Return register for transparent calling convention (gr122).  */
 178 #define TPC_REGNUM (122 - 96 + GR96_REGNUM)
 179
 180 /* Large Return Pointer (gr123).  */
 181 #define LRP_REGNUM (123 - 96 + GR96_REGNUM)
 182
 183 /* Static link pointer (gr124).  */
 184 #define SLP_REGNUM (124 - 96 + GR96_REGNUM)
 185
 186 /* Memory Stack Pointer (gr125).  */
 187 #define MSP_REGNUM (125 - 96 + GR96_REGNUM)
 188
 189 /* Register allocate bound (gr126).  */
 190 #define RAB_REGNUM (126 - 96 + GR96_REGNUM)
 191
 192 /* Register Free Bound (gr127).  */
 193 #define RFB_REGNUM (127 - 96 + GR96_REGNUM)
 194
 195 /* Register Stack Pointer.  */
 196 #define RSP_REGNUM GR1_REGNUM
 197 #define LR0_REGNUM 32
 198 #define BP_REGNUM 177
 199 #define FC_REGNUM 178
 200 #define CR_REGNUM 179
 201 #define Q_REGNUM 180
 202 #define VAB_REGNUM 181
 203 #define OPS_REGNUM (VAB_REGNUM + 1)
 204 #define CPS_REGNUM (VAB_REGNUM + 2)
 205 #define CFG_REGNUM (VAB_REGNUM + 3)
 206 #define CHA_REGNUM (VAB_REGNUM + 4)
 207 #define CHD_REGNUM (VAB_REGNUM + 5)
 208 #define CHC_REGNUM (VAB_REGNUM + 6)
 209 #define RBP_REGNUM (VAB_REGNUM + 7)
 210 #define TMC_REGNUM (VAB_REGNUM + 8)
 211 #define TMR_REGNUM (VAB_REGNUM + 9)
 212 #define NPC_REGNUM (VAB_REGNUM + 10)    /* pc0 */
 213 #define PC_REGNUM  (VAB_REGNUM + 11)    /* pc1 */
 214 #define PC2_REGNUM (VAB_REGNUM + 12)
 215 #define MMU_REGNUM (VAB_REGNUM + 13)
 216 #define LRU_REGNUM (VAB_REGNUM + 14)
 217 #define FPE_REGNUM (VAB_REGNUM + 15)
 218 #define INTE_REGNUM (VAB_REGNUM + 16)
 219 #define FPS_REGNUM (VAB_REGNUM + 17)
 220 #define EXO_REGNUM (VAB_REGNUM + 18)
 221 /* gr1 is defined above as 200 = VAB_REGNUM + 19 */
 222 #define ALU_REGNUM (VAB_REGNUM + 20)
 223 #define PS_REGNUM  ALU_REGNUM
 224 #define IPC_REGNUM (VAB_REGNUM + 21)
 225 #define IPA_REGNUM (VAB_REGNUM + 22)
 226 #define IPB_REGNUM (VAB_REGNUM + 23)
 227
 228 #endif /* !defined(REGISTER_NAMES) */
 229
 230 /* Total amount of space needed to store our copies of the machine's
 231    register state, the array `registers'.  */
 232 #define REGISTER_BYTES (NUM_REGS * 4)
 233
 234 /* Index within `registers' of the first byte of the space for
 235    register N.  */
 236 #define REGISTER_BYTE(N)  ((N)*4)
 237
 238 /* Number of bytes of storage in the actual machine representation
 239    for register N.  */
 240
 241 /* All regs are 4 bytes.  */
 242
 243 #define REGISTER_RAW_SIZE(N) (4)
 244
 245 /* Number of bytes of storage in the program's representation
 246    for register N.  */
 247
 248 /* All regs are 4 bytes.  */
 249
 250 #define REGISTER_VIRTUAL_SIZE(N) (4)
 251
 252 /* Largest value REGISTER_RAW_SIZE can have.  */
 253
 254 #define MAX_REGISTER_RAW_SIZE (4)
 255
 256 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 257
 258 #define MAX_REGISTER_VIRTUAL_SIZE (4)
 259
 260 /* Return the GDB type object for the "standard" data type
 261    of data in register N.  */
 262
 263 #define REGISTER_VIRTUAL_TYPE(N) \
 264   (((N) == PC_REGNUM || (N) == LRP_REGNUM || (N) == SLP_REGNUM         \
 265     || (N) == MSP_REGNUM || (N) == RAB_REGNUM || (N) == RFB_REGNUM     \
 266     || (N) == GR1_REGNUM || (N) == FP_REGNUM || (N) == LR0_REGNUM       \
 267     || (N) == NPC_REGNUM || (N) == PC2_REGNUM)                           \
 268    ? lookup_pointer_type (builtin_type_void) : builtin_type_int)
 269 \f
 270 /* Store the address of the place in which to copy the structure the
 271    subroutine will return.  This is called from call_function. */
 272 /* On the a29k the LRP points to the part of the structure beyond the first
 273    16 words.  */
 274 #define STORE_STRUCT_RETURN(ADDR, SP) \
 275   write_register (LRP_REGNUM, (ADDR) + 16 * 4);
 276
 277 /* Should call_function allocate stack space for a struct return?  */
 278 /* On the a29k objects over 16 words require the caller to allocate space.  */
 279 extern use_struct_convention_fn a29k_use_struct_convention;
 280 #define USE_STRUCT_CONVENTION(gcc_p, type) a29k_use_struct_convention (gcc_p, type)
 281
 282 /* Extract from an array REGBUF containing the (raw) register state
 283    a function return value of type TYPE, and copy that, in virtual format,
 284    into VALBUF.  */
 285
 286 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF)              \
 287   {                                                                        \
 288     int reg_length = TYPE_LENGTH (TYPE);                                   \
 289     if (reg_length > 16 * 4)                                               \
 290       {                                                                    \
 291         reg_length = 16 * 4;                                               \
 292         read_memory (*((int *)(REGBUF) + LRP_REGNUM), (VALBUF) + 16 * 4,   \
 293                      TYPE_LENGTH (TYPE) - 16 * 4);                         \
 294       }                                                                    \
 295     memcpy ((VALBUF), ((int *)(REGBUF))+RETURN_REGNUM, reg_length);        \
 296   }
 297
 298 /* Write into appropriate registers a function return value
 299    of type TYPE, given in virtual format.  */
 300
 301 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 302   {                                                                       \
 303     int reg_length = TYPE_LENGTH (TYPE);                                  \
 304     if (reg_length > 16 * 4)                                              \
 305       {                                                                   \
 306         reg_length = 16 * 4;                                              \
 307         write_memory (read_register (LRP_REGNUM),                         \
 308                       (char *)(VALBUF) + 16 * 4,                          \
 309                       TYPE_LENGTH (TYPE) - 16 * 4);                       \
 310       }                                                                   \
 311     write_register_bytes (REGISTER_BYTE (RETURN_REGNUM), (char *)(VALBUF),  \
 312                           TYPE_LENGTH (TYPE));                            \
 313   }
 314 \f/* *INDENT-OFF* */
 315 /* The a29k user's guide documents well what the stacks look like.
 316    But what isn't so clear there is how this interracts with the
 317    symbols, or with GDB.
 318    In the following saved_msp, saved memory stack pointer (which functions
 319    as a memory frame pointer), means either
 320    a register containing the memory frame pointer or, in the case of
 321    functions with fixed size memory frames (i.e. those who don't use
 322    alloca()), the result of the calculation msp + msize.
 323
 324    LOC_ARG, LOC_LOCAL - For GCC, these are relative to saved_msp.
 325    For high C, these are relative to msp (making alloca impossible).
 326    LOC_REGISTER, LOC_REGPARM - The register number is the number at the
 327    time the function is running (after the prologue), or in the case
 328    of LOC_REGPARM, may be a register number in the range 160-175.
 329
 330    The compilers do things like store an argument into memory, and then put out
 331    a LOC_ARG for it, or put it into global registers and put out a
 332    LOC_REGPARM.  Thus is it important to execute the first line of
 333    code (i.e. the line of the open brace, i.e. the prologue) of a function
 334    before trying to print arguments or anything.
 335
 336    The following diagram attempts to depict what is going on in memory
 337    (see also the _a29k user's guide_) and also how that interacts with
 338    GDB frames.  We arbitrarily pick fci->frame to point the same place
 339    as the register stack pointer; since we set it ourself in
 340    INIT_EXTRA_FRAME_INFO, and access it only through the FRAME_*
 341    macros, it doesn't really matter exactly how we
 342    do it.  However, note that FRAME_FP is used in two ways in GDB:
 343    (1) as a "magic cookie" which uniquely identifies frames (even over
 344    calls to the inferior), (2) (in PC_IN_CALL_DUMMY [ON_STACK])
 345    as the value of SP_REGNUM before the dummy frame was pushed.  These
 346    two meanings would be incompatible for the a29k if we defined
 347    CALL_DUMMY_LOCATION == ON_STACK (but we don't, so don't worry about it).
 348    Also note that "lr1" below, while called a frame pointer
 349    in the user's guide, has only one function:  To determine whether
 350    registers need to be filled in the function epilogue.
 351
 352    Consider the code:
 353    < call bar>
 354    loc1: . . .
 355    bar:  sub gr1,gr1,rsize_b
 356    . . .
 357    add mfp,msp,0
 358    sub msp,msp,msize_b
 359    . . .
 360    < call foo >
 361    loc2: . . .
 362    foo:  sub gr1,gr1,rsize_f
 363    . . .
 364    add mfp,msp,0
 365    sub msp,msp,msize_f
 366    . . .
 367    loc3: < suppose the inferior stops here >
 368
 369    memory stack      register stack
 370    |           |     |____________|
 371    |           |     |____loc1____|
 372    +------->|___________|     |            |   ^
 373    |        | ^         |     |  locals_b  |   |
 374    |        | |         |     |____________|   |
 375    |        | |         |     |            |   | rsize_b
 376    |        | | msize_b |     | args_to_f  |   |
 377    |        | |         |     |____________|   |
 378    |        | |         |     |____lr1_____|   V
 379    |        | V         |     |____loc2____|<----------------+
 380    |   +--->|___________|<---------mfp     |   ^             |
 381    |   |    | ^         |     |  locals_f  |   |             |
 382    |   |    | | msize_f |     |____________|   |             |
 383    |   |    | |         |     |            |   | rsize_f     |
 384    |   |    | V         |     |   args     |   |             |
 385    |   |    |___________|<msp |____________|   |             |
 386    |   |                      |_____lr1____|   V             |
 387    |   |                      |___garbage__| <- gr1 <----+   |
 388    |   |                                                |   |
 389    |   |                                                |   |
 390    |   |                             pc=loc3                    |   |
 391    |   |                                                |   |
 392    |   |                                                |   |
 393    |   |            frame cache                         |   |
 394    |   |       |_________________|                      |   |
 395    |   |       |rsize=rsize_b    |                      |   |
 396    |   |       |msize=msize_b    |                      |   |
 397    +---|--------saved_msp        |                      |   |
 398    |       |frame------------------------------------|---+
 399    |       |pc=loc2          |                       |
 400    |       |_________________|                       |
 401    |       |rsize=rsize_f    |                       |
 402    |       |msize=msize_f    |                       |
 403    +--------saved_msp        |                       |
 404    |frame------------------------------------+
 405    |pc=loc3          |
 406    |_________________|
 407
 408    So, is that sufficiently confusing?  Welcome to the 29000.
 409    Notes:
 410    * The frame for foo uses a memory frame pointer but the frame for
 411    bar does not.  In the latter case the saved_msp is
 412    computed by adding msize to the saved_msp of the
 413    next frame.
 414    * msize is in the frame cache only for high C's sake.  */
 415 /* *INDENT-ON* */
 416
 417
 418 void read_register_stack ();
 419 long read_register_stack_integer ();
 420 \f
 421 #define FRAME_INIT_SAVED_REGS(fi)       /*no-op */
 422
 423 #define EXTRA_FRAME_INFO  \
 424   CORE_ADDR saved_msp;    \
 425   unsigned int rsize;     \
 426   unsigned int msize;     \
 427   unsigned char flags;
 428
 429 /* Bits for flags in EXTRA_FRAME_INFO */
 430 #define TRANSPARENT_FRAME       0x1     /* This is a transparent frame */
 431 #define MFP_USED                0x2     /* A memory frame pointer is used */
 432
 433 /* Because INIT_FRAME_PC gets passed fromleaf, that's where we init
 434    not only ->pc and ->frame, but all the extra stuff, when called from
 435    get_prev_frame, that is.  */
 436 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci)  init_extra_frame_info(fci)
 437 void init_extra_frame_info ();
 438
 439 #define INIT_FRAME_PC(fromleaf, fci) init_frame_pc(fromleaf, fci)
 440 void init_frame_pc ();
 441 \f
 442
 443 /* FRAME_CHAIN takes a FRAME
 444    and produces the frame's chain-pointer.
 445
 446    However, if FRAME_CHAIN_VALID returns zero,
 447    it means the given frame is the outermost one and has no caller.  */
 448
 449 /* On the a29k, the nominal address of a frame is the address on the
 450    register stack of the return address (the one next to the incoming
 451    arguments, not down at the bottom so nominal address == stack pointer).
 452
 453    GDB expects "nominal address" to equal contents of FP_REGNUM,
 454    at least when it comes time to create the innermost frame.
 455    However, that doesn't work for us, so when creating the innermost
 456    frame we set ->frame ourselves in INIT_EXTRA_FRAME_INFO.  */
 457
 458 /* These are mostly dummies for the a29k because INIT_FRAME_PC
 459    sets prev->frame instead.  */
 460 /* If rsize is zero, we must be at end of stack (or otherwise hosed).
 461    If we don't check rsize, we loop forever if we see rsize == 0.  */
 462 #define FRAME_CHAIN(thisframe) \
 463   ((thisframe)->rsize == 0 \
 464    ? 0 \
 465    : (thisframe)->frame + (thisframe)->rsize)
 466
 467 /* Determine if the frame has a 'previous' and back-traceable frame. */
 468 #define FRAME_IS_UNCHAINED(frame)       ((frame)->flags & TRANSPARENT_FRAME)
 469
 470 /* Find the previous frame of a transparent routine.
 471  * For now lets not try and trace through a transparent routine (we might
 472  * have to assume that all transparent routines are traps).
 473  */
 474 #define FIND_PREV_UNCHAINED_FRAME(frame)        0
 475
 476 /* Define other aspects of the stack frame.  */
 477
 478 /* An expression that tells us whether the function invocation represented
 479    by FI does not have a frame on the stack associated with it. */
 480 #define FRAMELESS_FUNCTION_INVOCATION(FI) \
 481   (frameless_look_for_prologue (FI))
 482
 483 /* Saved pc (i.e. return address).  */
 484 #define FRAME_SAVED_PC(fraim) \
 485   (read_register_stack_integer ((fraim)->frame + (fraim)->rsize, 4))
 486
 487 /* Local variables (i.e. LOC_LOCAL) are on the memory stack, with their
 488    offsets being relative to the memory stack pointer (high C) or
 489    saved_msp (gcc).  */
 490
 491 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address (fi)
 492 extern CORE_ADDR frame_locals_address ();
 493
 494 /* Return number of args passed to a frame.
 495    Can return -1, meaning no way to tell.  */
 496 /* We tried going to the effort of finding the tags word and getting
 497    the argcount field from it, to support debugging assembler code.
 498    Problem was, the "argcount" field never did hold the argument
 499    count.  */
 500 #define FRAME_NUM_ARGS(fi) (-1)
 501
 502 #define FRAME_ARGS_ADDRESS(fi) FRAME_LOCALS_ADDRESS (fi)
 503
 504 /* Return number of bytes at start of arglist that are not really args.  */
 505
 506 #define FRAME_ARGS_SKIP 0
 507
 508 /* Provide our own get_saved_register.  HAVE_REGISTER_WINDOWS is insufficient
 509    because registers get renumbered on the a29k without getting saved.  */
 510
 511 struct frame_info;
 512 void a29k_get_saved_register (char *raw_buffer, int *optimized,
 513                               CORE_ADDR * addrp, struct frame_info *frame,
 514                               int regnum, enum lval_type *lvalp);
 515 #define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \
 516       a29k_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
 517 \f
 518 /* Call function stuff.  */
 519 /* *INDENT-OFF* */
 520 /* The dummy frame looks like this (see also the general frame picture
 521    above):
 522
 523                                         register stack
 524
 525                                       |                |  frame for function
 526                                       |   locals_sproc |  executing at time
 527                                       |________________|  of call_function.
 528                                       |                |  We must not disturb
 529                                       | args_out_sproc |  it.
 530         memory stack                  |________________|
 531                                       |____lr1_sproc___|<-+
 532        |            |                 |__retaddr_sproc_|  | <-- gr1 (at start)
 533        |____________|<-msp 0 <-----------mfp_dummy_____|  |
 534        |            |  (at start)     |  save regs     |  |
 535        | arg_slop   |                 |  pc0,pc1       |  |
 536        |            |                 |  pc2,lr0 sproc |  |
 537        | (16 words) |                 | gr96-gr124     |  |
 538        |____________|<-msp 1--after   | sr160-sr162    |  |
 539        |            | PUSH_DUMMY_FRAME| sr128-sr135    |  |
 540        | struct ret |                 |________________|  |
 541        | 17+        |                 |                |  |
 542        |____________|<- lrp           | args_out_dummy |  |
 543        | struct ret |                 |  (16 words)    |  |
 544        | 16         |                 |________________|  |
 545        | (16 words) |                 |____lr1_dummy___|--+
 546        |____________|<- msp 2--after  |_retaddr_dummy__|<- gr1 after
 547        |            | struct ret      |                |   PUSH_DUMMY_FRAME
 548        | margs17+   | area allocated  |  locals_inf    |
 549        |            |                 |________________|    called
 550        |____________|<- msp 4--when   |                |    function's
 551        |            |   inf called    | args_out_inf   |    frame (set up
 552        | margs16    |                 |________________|    by called
 553        | (16 words) |                 |_____lr1_inf____|    function).
 554        |____________|<- msp 3--after  |       .        |
 555        |            |   args pushed   |       .        |
 556        |            |                 |       .        |
 557                                       |                |
 558
 559    arg_slop: This area is so that when the call dummy adds 16 words to
 560       the msp, it won't end up larger than mfp_dummy (it is needed in the
 561       case where margs and struct_ret do not add up to at least 16 words).
 562    struct ret:  This area is allocated by GDB if the return value is more
 563       than 16 words.  struct ret_16 is not used on the a29k.
 564    margs:  Pushed by GDB.  The call dummy copies the first 16 words to
 565       args_out_dummy.
 566    retaddr_sproc:  Contains the PC at the time we call the function.
 567       set by PUSH_DUMMY_FRAME and read by POP_FRAME.
 568    retaddr_dummy:  This points to a breakpoint instruction in the dummy.  */
 569 /* *INDENT-ON* */
 570 \f
 571
 572
 573 /* Rsize for dummy frame, in bytes.  */
 574
 575 /* Bytes for outgoing args, lr1, and retaddr.  */
 576 #define DUMMY_ARG (2 * 4 + 16 * 4)
 577
 578 /* Number of special registers (sr128-) to save.  */
 579 #define DUMMY_SAVE_SR128 8
 580 /* Number of special registers (sr160-) to save.  */
 581 #define DUMMY_SAVE_SR160 3
 582 /* Number of general (gr96- or gr64-) registers to save.  */
 583 #define DUMMY_SAVE_GREGS 29
 584
 585 #define DUMMY_FRAME_RSIZE \
 586 (4 /* mfp_dummy */        \
 587  + 4 * 4  /* pc0, pc1, pc2, lr0 */  \
 588  + DUMMY_SAVE_GREGS * 4   \
 589  + DUMMY_SAVE_SR160 * 4   \
 590  + DUMMY_SAVE_SR128 * 4   \
 591  + DUMMY_ARG              \
 592  + 4 /* pad to doubleword */ )
 593
 594 /* Push an empty stack frame, to record the current PC, etc.  */
 595
 596 #define PUSH_DUMMY_FRAME push_dummy_frame()
 597 extern void push_dummy_frame ();
 598
 599 /* Discard from the stack the innermost frame,
 600    restoring all saved registers.  */
 601
 602 #define POP_FRAME pop_frame()
 603 extern void pop_frame ();
 604
 605 /* This sequence of words is the instructions
 606    mtsrim cr, 15
 607    loadm 0, 0, lr2, msp     ; load first 16 words of arguments into registers
 608    add msp, msp, 16 * 4     ; point to the remaining arguments
 609    CONST_INSN:
 610    const lr0,inf                ; (replaced by       half of target addr)
 611    consth lr0,inf               ; (replaced by other half of target addr)
 612    calli lr0, lr0
 613    aseq 0x40,gr1,gr1   ; nop
 614    BREAKPT_INSN:
 615    asneq 0x50,gr1,gr1  ; breakpoint     (replaced by local breakpoint insn)
 616  */
 617
 618 #if TARGET_BYTE_ORDER == HOST_BYTE_ORDER
 619 #define BS(const)       const
 620 #else
 621 #define BS(const)       (((const) & 0xff) << 24) |      \
 622                         (((const) & 0xff00) << 8) |     \
 623                         (((const) & 0xff0000) >> 8) |   \
 624                         (((const) & 0xff000000) >> 24)
 625 #endif
 626
 627 /* Position of the "const" and blkt instructions within CALL_DUMMY in bytes. */
 628 #define CONST_INSN (3 * 4)
 629 #define BREAKPT_INSN (7 * 4)
 630 #define CALL_DUMMY {    \
 631                 BS(0x0400870f),\
 632                 BS(0x36008200|(MSP_HW_REGNUM)), \
 633                 BS(0x15000040|(MSP_HW_REGNUM<<8)|(MSP_HW_REGNUM<<16)), \
 634                 BS(0x03ff80ff), \
 635                 BS(0x02ff80ff), \
 636                 BS(0xc8008080), \
 637                 BS(0x70400101), \
 638                 BS(0x72500101)}
 639 #define CALL_DUMMY_LENGTH (8 * 4)
 640
 641 #define CALL_DUMMY_START_OFFSET 0       /* Start execution at beginning of dummy */
 642
 643 /* Helper macro for FIX_CALL_DUMMY.  WORDP is a long * which points to a
 644    word in target byte order; bits 0-7 and 16-23 of *WORDP are replaced with
 645    bits 0-7 and 8-15 of DATA (which is in host byte order).  */
 646
 647 #if TARGET_BYTE_ORDER == BIG_ENDIAN
 648 #define STUFF_I16(WORDP, DATA) \
 649   { \
 650     *((char *)(WORDP) + 3) = ((DATA) & 0xff);\
 651     *((char *)(WORDP) + 1) = (((DATA) >> 8) & 0xff);\
 652   }
 653 #else /* Target is little endian.  */
 654 #define STUFF_I16(WORDP, DATA) \
 655   {
 656 *(char *) (WORDP) = ((DATA) & 0xff);
 657 *((char *) (WORDP) + 2) = (((DATA) >> 8) & 0xff);
 658 }
 659 #endif /* Target is little endian.  */
 660
 661 /* Insert the specified number of args and function address
 662    into a call sequence of the above form stored at DUMMYNAME.  */
 663
 664 /* Currently this stuffs in the address of the function that we are calling.
 665    Since different a29k systems use different breakpoint instructions, it
 666    also stuffs BREAKPOINT in the right place (to avoid having to
 667    duplicate CALL_DUMMY in each tm-*.h file).  */
 668
 669 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   \
 670   {\
 671     STUFF_I16((char *)dummyname + CONST_INSN, fun);             \
 672     STUFF_I16((char *)dummyname + CONST_INSN + 4, fun >> 16);   \
 673   /* FIXME  memcpy ((char *)(dummyname) + BREAKPT_INSN, break_insn, 4); */ \
 674   }
 675
 676 /* a29k architecture has separate data & instruction memories -- wired to
 677    different pins on the chip -- and can't execute the data memory.
 678    Also, there should be space after text_end;
 679    we won't get a SIGSEGV or scribble on data space.  */
 680
 681 #define CALL_DUMMY_LOCATION AFTER_TEXT_END
 682
 683 /* Because of this, we need (as a kludge) to know the addresses of the
 684    text section.  */
 685
 686 #define NEED_TEXT_START_END 1
 687
 688 /* How to translate register numbers in the .stab's into gdb's internal register
 689    numbers.  We don't translate them, but we warn if an invalid register
 690    number is seen.  Note that FIXME, we use the value "sym" as an implicit
 691    argument in printing the error message.  It happens to be available where
 692    this macro is used.  (This macro definition appeared in a late revision
 693    of gdb-3.91.6 and is not well tested.  Also, it should be a "complaint".) */
 694
 695 #define STAB_REG_TO_REGNUM(num) \
 696         (((num) > LR0_REGNUM + 127) \
 697            ? fprintf(stderr,    \
 698                 "Invalid register number %d in symbol table entry for %s\n", \
 699                  (num), SYMBOL_SOURCE_NAME (sym)), (num)        \
 700            : (num))
 701
 702 extern enum a29k_processor_types
 703 {
 704   a29k_unknown,
 705
 706   /* Bit 0x400 of the CPS does *not* identify freeze mode, i.e. 29000,
 707      29030, etc.  */
 708   a29k_no_freeze_mode,
 709
 710   /* Bit 0x400 of the CPS does identify freeze mode, i.e. 29050.  */
 711   a29k_freeze_mode
 712 }
 713 processor_type;
 714
 715 /* We need three arguments for a general frame specification for the
 716    "frame" or "info frame" command.  */
 717
 718 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
 719 extern struct frame_info *setup_arbitrary_frame (int, CORE_ADDR *);