gdb/config/sparc/tm-sparc.h

   1 /* Target machine sub-parameters for SPARC, for GDB, the GNU debugger.
   2    This is included by other tm-*.h files to define SPARC cpu-related info.
   3    Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994
   4    Free Software Foundation, Inc.
   5    Contributed by Michael Tiemann (tiemann@mcc.com)
   6
   7 This file is part of GDB.
   8
   9 This program is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2 of the License, or
  12 (at your option) any later version.
  13
  14 This program is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with this program; if not, write to the Free Software
  21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  22
  23 #define TARGET_BYTE_ORDER BIG_ENDIAN
  24
  25 /* Floating point is IEEE compatible.  */
  26 #define IEEE_FLOAT
  27
  28 /* If an argument is declared "register", Sun cc will keep it in a register,
  29    never saving it onto the stack.  So we better not believe the "p" symbol
  30    descriptor stab.  */
  31
  32 #define USE_REGISTER_NOT_ARG
  33
  34 /* When passing a structure to a function, Sun cc passes the address
  35    not the structure itself.  It (under SunOS4) creates two symbols,
  36    which we need to combine to a LOC_REGPARM.  Gcc version two (as of
  37    1.92) behaves like sun cc.  REG_STRUCT_HAS_ADDR is smart enough to
  38    distinguish between Sun cc, gcc version 1 and gcc version 2.  */
  39
  40 #define REG_STRUCT_HAS_ADDR(gcc_p,type) (gcc_p != 1)
  41
  42 /* Sun /bin/cc gets this right as of SunOS 4.1.x.  We need to define
  43    BELIEVE_PCC_PROMOTION to get this right now that the code which
  44    detects gcc2_compiled. is broken.  This loses for SunOS 4.0.x and
  45    earlier.  */
  46
  47 #define BELIEVE_PCC_PROMOTION 1
  48
  49 /* For acc, there's no need to correct LBRAC entries by guessing how
  50    they should work.  In fact, this is harmful because the LBRAC
  51    entries now all appear at the end of the function, not intermixed
  52    with the SLINE entries.  n_opt_found detects acc for Solaris binaries;
  53    function_stab_type detects acc for SunOS4 binaries.
  54
  55    For binary from SunOS4 /bin/cc, need to correct LBRAC's.
  56
  57    For gcc, like acc, don't correct.  */
  58
  59 #define SUN_FIXED_LBRAC_BUG \
  60   (n_opt_found \
  61    || function_stab_type == N_STSYM \
  62    || function_stab_type == N_GSYM \
  63    || processing_gcc_compilation)
  64
  65 /* Do variables in the debug stabs occur after the N_LBRAC or before it?
  66    acc: after, gcc: before, SunOS4 /bin/cc: before.  */
  67
  68 #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) \
  69   (!(gcc_p) \
  70    && (n_opt_found \
  71        || function_stab_type == N_STSYM \
  72        || function_stab_type == N_GSYM))
  73
  74 /* Offset from address of function to start of its code.
  75    Zero on most machines.  */
  76
  77 #define FUNCTION_START_OFFSET 0
  78
  79 /* Advance PC across any function entry prologue instructions
  80    to reach some "real" code.  SKIP_PROLOGUE_FRAMELESS_P advances
  81    the PC past some of the prologue, but stops as soon as it
  82    knows that the function has a frame.  Its result is equal
  83    to its input PC if the function is frameless, unequal otherwise.  */
  84
  85 #define SKIP_PROLOGUE(pc) \
  86   { pc = skip_prologue (pc, 0); }
  87 #define SKIP_PROLOGUE_FRAMELESS_P(pc) \
  88   { pc = skip_prologue (pc, 1); }
  89 extern CORE_ADDR skip_prologue PARAMS ((CORE_ADDR, int));
  90
  91 /* Immediately after a function call, return the saved pc.
  92    Can't go through the frames for this because on some machines
  93    the new frame is not set up until the new function executes
  94    some instructions.  */
  95
  96 /* On the Sun 4 under SunOS, the compile will leave a fake insn which
  97    encodes the structure size being returned.  If we detect such
  98    a fake insn, step past it.  */
  99
 100 #define PC_ADJUST(pc) sparc_pc_adjust(pc)
 101 extern CORE_ADDR sparc_pc_adjust PARAMS ((CORE_ADDR));
 102
 103 #define SAVED_PC_AFTER_CALL(frame) PC_ADJUST (read_register (RP_REGNUM))
 104
 105 /* Stack grows downward.  */
 106
 107 #define INNER_THAN <
 108
 109 /* Stack has strict alignment.  */
 110
 111 #define STACK_ALIGN(ADDR) (((ADDR)+7)&-8)
 112
 113 /* Sequence of bytes for breakpoint instruction.  */
 114
 115 #define BREAKPOINT {0x91, 0xd0, 0x20, 0x01}
 116
 117 /* Amount PC must be decremented by after a breakpoint.
 118    This is often the number of bytes in BREAKPOINT
 119    but not always.  */
 120
 121 #define DECR_PC_AFTER_BREAK 0
 122
 123 /* Nonzero if instruction at PC is a return instruction.  */
 124 /* For SPARC, this is either a "jmpl %o7+8,%g0" or "jmpl %i7+8,%g0".
 125
 126    Note: this does not work for functions returning structures under SunOS.  */
 127 #define ABOUT_TO_RETURN(pc) \
 128   ((read_memory_integer (pc, 4)|0x00040000) == 0x81c7e008)
 129
 130 /* Say how long (ordinary) registers are.  This is a piece of bogosity
 131    used in push_word and a few other places; REGISTER_RAW_SIZE is the
 132    real way to know how big a register is.  */
 133
 134 #define REGISTER_SIZE 4
 135
 136 /* Number of machine registers */
 137
 138 #define NUM_REGS 72
 139
 140 /* Initializer for an array of names of registers.
 141    There should be NUM_REGS strings in this initializer.  */
 142
 143 #define REGISTER_NAMES  \
 144 { "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",       \
 145   "o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",       \
 146   "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",       \
 147   "i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7",       \
 148                                                                 \
 149   "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",       \
 150   "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
 151   "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",       \
 152   "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",       \
 153                                                                 \
 154   "y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr" }
 155
 156 /* Register numbers of various important registers.
 157    Note that some of these values are "real" register numbers,
 158    and correspond to the general registers of the machine,
 159    and some are "phony" register numbers which are too large
 160    to be actual register numbers as far as the user is concerned
 161    but do serve to get the desired values when passed to read_register.  */
 162
 163 #define G0_REGNUM 0             /* %g0 */
 164 #define G1_REGNUM 1             /* %g1 */
 165 #define O0_REGNUM 8             /* %o0 */
 166 #define SP_REGNUM 14            /* Contains address of top of stack, \
 167                                    which is also the bottom of the frame.  */
 168 #define RP_REGNUM 15            /* Contains return address value, *before* \
 169                                    any windows get switched.  */
 170 #define O7_REGNUM 15            /* Last local reg not saved on stack frame */
 171 #define L0_REGNUM 16            /* First local reg that's saved on stack frame
 172                                    rather than in machine registers */
 173 #define I0_REGNUM 24            /* %i0 */
 174 #define FP_REGNUM 30            /* Contains address of executing stack frame */
 175 #define I7_REGNUM 31            /* Last local reg saved on stack frame */
 176 #define FP0_REGNUM 32           /* Floating point register 0 */
 177 #define Y_REGNUM 64             /* Temp register for multiplication, etc.  */
 178 #define PS_REGNUM 65            /* Contains processor status */
 179 #define WIM_REGNUM 66           /* Window Invalid Mask (not really supported) */
 180 #define TBR_REGNUM 67           /* Trap Base Register (not really supported) */
 181 #define PC_REGNUM 68            /* Contains program counter */
 182 #define NPC_REGNUM 69           /* Contains next PC */
 183 #define FPS_REGNUM 70           /* Floating point status register */
 184 #define CPS_REGNUM 71           /* Coprocessor status register */
 185
 186 /* Total amount of space needed to store our copies of the machine's
 187    register state, the array `registers'.  On the sparc, `registers'
 188    contains the ins and locals, even though they are saved on the
 189    stack rather than with the other registers, and this causes hair
 190    and confusion in places like pop_frame.  It might be
 191    better to remove the ins and locals from `registers', make sure
 192    that get_saved_register can get them from the stack (even in the
 193    innermost frame), and make this the way to access them.  For the
 194    frame pointer we would do that via TARGET_READ_FP.  On the other hand,
 195    that is likely to be confusing or worse for flat frames.  */
 196
 197 #define REGISTER_BYTES (32*4+32*4+8*4)
 198
 199 /* Index within `registers' of the first byte of the space for
 200    register N.  */
 201 /* ?? */
 202 #define REGISTER_BYTE(N)  ((N)*4)
 203
 204 /* We need to override GET_SAVED_REGISTER so that we can deal with the way
 205    outs change into ins in different frames.  HAVE_REGISTER_WINDOWS can't
 206    deal with this case and also handle flat frames at the same time.  */
 207
 208 #define GET_SAVED_REGISTER 1
 209
 210 /* Number of bytes of storage in the actual machine representation
 211    for register N.  */
 212
 213 /* On the SPARC, all regs are 4 bytes.  */
 214
 215 #define REGISTER_RAW_SIZE(N) (4)
 216
 217 /* Number of bytes of storage in the program's representation
 218    for register N.  */
 219
 220 /* On the SPARC, all regs are 4 bytes.  */
 221
 222 #define REGISTER_VIRTUAL_SIZE(N) (4)
 223
 224 /* Largest value REGISTER_RAW_SIZE can have.  */
 225
 226 #define MAX_REGISTER_RAW_SIZE 8
 227
 228 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 229
 230 #define MAX_REGISTER_VIRTUAL_SIZE 8
 231
 232 /* Return the GDB type object for the "standard" data type
 233    of data in register N.  */
 234
 235 #define REGISTER_VIRTUAL_TYPE(N) \
 236  ((N) < 32 ? builtin_type_int : (N) < 64 ? builtin_type_float : \
 237   builtin_type_int)
 238
 239 /* Writing to %g0 is a noop (not an error or exception or anything like
 240    that, however).  */
 241
 242 #define CANNOT_STORE_REGISTER(regno) ((regno) == G0_REGNUM)
 243
 244 /* Store the address of the place in which to copy the structure the
 245    subroutine will return.  This is called from call_function. */
 246
 247 #define STORE_STRUCT_RETURN(ADDR, SP) \
 248   { target_write_memory ((SP)+(16*4), (char *)&(ADDR), 4); }
 249
 250 /* Extract from an array REGBUF containing the (raw) register state
 251    a function return value of type TYPE, and copy that, in virtual format,
 252    into VALBUF.  */
 253
 254 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF)              \
 255   {                                                                        \
 256     if (TYPE_CODE (TYPE) == TYPE_CODE_FLT)                                 \
 257       {                                                                    \
 258         memcpy ((VALBUF), ((int *)(REGBUF))+FP0_REGNUM, TYPE_LENGTH(TYPE));\
 259       }                                                                    \
 260     else                                                                   \
 261       memcpy ((VALBUF),                                                    \
 262               (char *)(REGBUF) + 4 * 8 +                                   \
 263               (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)),        \
 264               TYPE_LENGTH(TYPE));                                          \
 265   }
 266
 267 /* Write into appropriate registers a function return value
 268    of type TYPE, given in virtual format.  */
 269 /* On sparc, values are returned in register %o0.  */
 270 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 271   {                                                                          \
 272     if (TYPE_CODE (TYPE) == TYPE_CODE_FLT)                                   \
 273       /* Floating-point values are returned in the register pair */          \
 274       /* formed by %f0 and %f1 (doubles are, anyway).  */                    \
 275       write_register_bytes (REGISTER_BYTE (FP0_REGNUM), (VALBUF),            \
 276                             TYPE_LENGTH (TYPE));                             \
 277     else                                                                     \
 278       /* Other values are returned in register %o0.  */                      \
 279       write_register_bytes (REGISTER_BYTE (O0_REGNUM), (VALBUF),             \
 280                             TYPE_LENGTH (TYPE));  \
 281   }
 282
 283 /* Extract from an array REGBUF containing the (raw) register state
 284    the address in which a function should return its structure value,
 285    as a CORE_ADDR (or an expression that can be used as one).  */
 286
 287 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
 288   (sparc_extract_struct_value_address (REGBUF))
 289
 290 extern CORE_ADDR
 291 sparc_extract_struct_value_address PARAMS ((char [REGISTER_BYTES]));
 292
 293 \f
 294 /* Describe the pointer in each stack frame to the previous stack frame
 295    (its caller).  */
 296
 297 /* FRAME_CHAIN takes a frame's nominal address
 298    and produces the frame's chain-pointer. */
 299
 300 /* In the case of the Sun 4, the frame-chain's nominal address
 301    is held in the frame pointer register.
 302
 303    On the Sun4, the frame (in %fp) is %sp for the previous frame.
 304    From the previous frame's %sp, we can find the previous frame's
 305    %fp: it is in the save area just above the previous frame's %sp.
 306
 307    If we are setting up an arbitrary frame, we'll need to know where
 308    it ends.  Hence the following.  This part of the frame cache
 309    structure should be checked before it is assumed that this frame's
 310    bottom is in the stack pointer.
 311
 312    If there isn't a frame below this one, the bottom of this frame is
 313    in the stack pointer.
 314
 315    If there is a frame below this one, and the frame pointers are
 316    identical, it's a leaf frame and the bottoms are the same also.
 317
 318    Otherwise the bottom of this frame is the top of the next frame.
 319
 320    The bottom field is misnamed, since it might imply that memory from
 321    bottom to frame contains this frame.  That need not be true if
 322    stack frames are allocated in different segments (e.g. some on a
 323    stack, some on a heap in the data segment).
 324
 325    GCC 2.6 and later can generate ``flat register window'' code that
 326    makes frames by explicitly saving those registers that need to be
 327    saved.  %i7 is used as the frame pointer, and the frame is laid out so
 328    that flat and non-flat calls can be intermixed freely within a
 329    program.  Unfortunately for GDB, this means it must detect and record
 330    the flatness of frames.
 331
 332    Since the prologue in a flat frame also tells us where fp and pc
 333    have been stashed (the frame is of variable size, so their location
 334    is not fixed), it's convenient to record them in the frame info.  */
 335
 336 #define EXTRA_FRAME_INFO  \
 337   CORE_ADDR bottom;  \
 338   int flat;  \
 339   /* Following fields only relevant for flat frames.  */ \
 340   CORE_ADDR pc_addr;  \
 341   CORE_ADDR fp_addr;  \
 342   /* Add this to ->frame to get the value of the stack pointer at the */ \
 343   /* time of the register saves.  */ \
 344   int sp_offset;
 345
 346 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) \
 347   sparc_init_extra_frame_info (fromleaf, fci)
 348 extern void sparc_init_extra_frame_info ();
 349
 350 #define PRINT_EXTRA_FRAME_INFO(fi) \
 351   { \
 352     if ((fi) && (fi)->flat) \
 353       printf_filtered (" flat, pc saved at 0x%x, fp saved at 0x%x\n", \
 354                        (fi)->pc_addr, (fi)->fp_addr); \
 355   }
 356
 357 #ifdef __STDC__
 358 struct frame_info;
 359 #endif
 360
 361 #define FRAME_CHAIN(thisframe) (sparc_frame_chain (thisframe))
 362 extern CORE_ADDR sparc_frame_chain PARAMS ((struct frame_info *));
 363
 364 /* INIT_EXTRA_FRAME_INFO needs the PC to detect flat frames.  */
 365
 366 #define INIT_FRAME_PC(fromleaf, prev) /* nothing */
 367 #define INIT_FRAME_PC_FIRST(fromleaf, prev) \
 368   (prev)->pc = ((fromleaf) ? SAVED_PC_AFTER_CALL ((prev)->next) : \
 369               (prev)->next ? FRAME_SAVED_PC ((prev)->next) : read_pc ());
 370
 371 /* Define other aspects of the stack frame.  */
 372
 373 /* A macro that tells us whether the function invocation represented
 374    by FI does not have a frame on the stack associated with it.  If it
 375    does not, FRAMELESS is set to 1, else 0.  */
 376 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 377   (FRAMELESS) = frameless_look_for_prologue(FI)
 378
 379 /* The location of I0 w.r.t SP.  This is actually dependent on how the system's
 380    window overflow/underflow routines are written.  Most vendors save the L regs
 381    followed by the I regs (at the higher address).  Some vendors get it wrong.
 382  */
 383
 384 #define FRAME_SAVED_L0  0
 385 #define FRAME_SAVED_I0  (8 * REGISTER_RAW_SIZE (L0_REGNUM))
 386
 387 /* Where is the PC for a specific frame */
 388
 389 #define FRAME_SAVED_PC(FRAME) sparc_frame_saved_pc (FRAME)
 390 extern CORE_ADDR sparc_frame_saved_pc ();
 391
 392 /* If the argument is on the stack, it will be here.  */
 393 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 394
 395 #define FRAME_STRUCT_ARGS_ADDRESS(fi) ((fi)->frame)
 396
 397 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 398
 399 /* Set VAL to the number of args passed to frame described by FI.
 400    Can set VAL to -1, meaning no way to tell.  */
 401
 402 /* We can't tell how many args there are
 403    now that the C compiler delays popping them.  */
 404 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 405
 406 /* Return number of bytes at start of arglist that are not really args.  */
 407
 408 #define FRAME_ARGS_SKIP 68
 409 \f
 410 /* Things needed for making the inferior call functions.  */
 411 /*
 412  * First of all, let me give my opinion of what the DUMMY_FRAME
 413  * actually looks like.
 414  *
 415  *               |                                 |
 416  *               |                                 |
 417  *               + - - - - - - - - - - - - - - - - +<-- fp (level 0)
 418  *               |                                 |
 419  *               |                                 |
 420  *               |                                 |
 421  *               |                                 |
 422  *               |  Frame of innermost program     |
 423  *               |           function              |
 424  *               |                                 |
 425  *               |                                 |
 426  *               |                                 |
 427  *               |                                 |
 428  *               |                                 |
 429  *               |---------------------------------|<-- sp (level 0), fp (c)
 430  *               |                                 |
 431  *     DUMMY     |             fp0-31              |
 432  *               |                                 |
 433  *               |             ------              |<-- fp - 0x80
 434  *     FRAME     |              g0-7               |<-- fp - 0xa0
 435  *               |              i0-7               |<-- fp - 0xc0
 436  *               |             other               |<-- fp - 0xe0
 437  *               |               ?                 |
 438  *               |               ?                 |
 439  *               |---------------------------------|<-- sp' = fp - 0x140
 440  *               |                                 |
 441  * xcution start |                                 |
 442  * sp' + 0x94 -->|        CALL_DUMMY (x code)      |
 443  *               |                                 |
 444  *               |                                 |
 445  *               |---------------------------------|<-- sp'' = fp - 0x200
 446  *               |  align sp to 8 byte boundary    |
 447  *               |     ==> args to fn <==          |
 448  *  Room for     |                                 |
 449  * i & l's + agg | CALL_DUMMY_STACK_ADJUST = 0x0x44|
 450  *               |---------------------------------|<-- final sp (variable)
 451  *               |                                 |
 452  *               |   Where function called will    |
 453  *               |           build frame.          |
 454  *               |                                 |
 455  *               |                                 |
 456  *
 457  *   I understand everything in this picture except what the space
 458  * between fp - 0xe0 and fp - 0x140 is used for.  Oh, and I don't
 459  * understand why there's a large chunk of CALL_DUMMY that never gets
 460  * executed (its function is superceeded by PUSH_DUMMY_FRAME; they
 461  * are designed to do the same thing).
 462  *
 463  *   PUSH_DUMMY_FRAME saves the registers above sp' and pushes the
 464  * register file stack down one.
 465  *
 466  *   call_function then writes CALL_DUMMY, pushes the args onto the
 467  * stack, and adjusts the stack pointer.
 468  *
 469  *   run_stack_dummy then starts execution (in the middle of
 470  * CALL_DUMMY, as directed by call_function).
 471  */
 472
 473 /* Push an empty stack frame, to record the current PC, etc.  */
 474
 475 #define PUSH_DUMMY_FRAME        sparc_push_dummy_frame ()
 476 #define POP_FRAME       sparc_pop_frame ()
 477
 478 void sparc_push_dummy_frame (), sparc_pop_frame ();
 479 /* This sequence of words is the instructions
 480
 481    save %sp,-0x140,%sp
 482    std  %f30,[%fp-0x08]
 483    std  %f28,[%fp-0x10]
 484    std  %f26,[%fp-0x18]
 485    std  %f24,[%fp-0x20]
 486    std  %f22,[%fp-0x28]
 487    std  %f20,[%fp-0x30]
 488    std  %f18,[%fp-0x38]
 489    std  %f16,[%fp-0x40]
 490    std  %f14,[%fp-0x48]
 491    std  %f12,[%fp-0x50]
 492    std  %f10,[%fp-0x58]
 493    std  %f8,[%fp-0x60]
 494    std  %f6,[%fp-0x68]
 495    std  %f4,[%fp-0x70]
 496    std  %f2,[%fp-0x78]
 497    std  %f0,[%fp-0x80]
 498    std  %g6,[%fp-0x88]
 499    std  %g4,[%fp-0x90]
 500    std  %g2,[%fp-0x98]
 501    std  %g0,[%fp-0xa0]
 502    std  %i6,[%fp-0xa8]
 503    std  %i4,[%fp-0xb0]
 504    std  %i2,[%fp-0xb8]
 505    std  %i0,[%fp-0xc0]
 506    nop ! stcsr  [%fp-0xc4]
 507    nop ! stfsr  [%fp-0xc8]
 508    nop ! wr     %npc,[%fp-0xcc]
 509    nop ! wr     %pc,[%fp-0xd0]
 510    rd   %tbr,%o0
 511    st   %o0,[%fp-0xd4]
 512    rd   %wim,%o1
 513    st   %o0,[%fp-0xd8]
 514    rd   %psr,%o0
 515    st   %o0,[%fp-0xdc]
 516    rd   %y,%o0
 517    st   %o0,[%fp-0xe0]
 518
 519      /..* The arguments are pushed at this point by GDB;
 520         no code is needed in the dummy for this.
 521         The CALL_DUMMY_START_OFFSET gives the position of
 522         the following ld instruction.  *../
 523
 524    ld   [%sp+0x58],%o5
 525    ld   [%sp+0x54],%o4
 526    ld   [%sp+0x50],%o3
 527    ld   [%sp+0x4c],%o2
 528    ld   [%sp+0x48],%o1
 529    call 0x00000000
 530    ld   [%sp+0x44],%o0
 531    nop
 532    ta 1
 533    nop
 534
 535    note that this is 192 bytes, which is a multiple of 8 (not only 4) bytes.
 536    note that the `call' insn is a relative, not an absolute call.
 537    note that the `nop' at the end is needed to keep the trap from
 538         clobbering things (if NPC pointed to garbage instead).
 539
 540 We actually start executing at the `sethi', since the pushing of the
 541 registers (as arguments) is done by PUSH_DUMMY_FRAME.  If this were
 542 real code, the arguments for the function called by the CALL would be
 543 pushed between the list of ST insns and the CALL, and we could allow
 544 it to execute through.  But the arguments have to be pushed by GDB
 545 after the PUSH_DUMMY_FRAME is done, and we cannot allow these ST
 546 insns to be performed again, lest the registers saved be taken for
 547 arguments.  */
 548
 549 #define CALL_DUMMY { 0x9de3bee0, 0xfd3fbff8, 0xf93fbff0, 0xf53fbfe8,    \
 550                      0xf13fbfe0, 0xed3fbfd8, 0xe93fbfd0, 0xe53fbfc8,    \
 551                      0xe13fbfc0, 0xdd3fbfb8, 0xd93fbfb0, 0xd53fbfa8,    \
 552                      0xd13fbfa0, 0xcd3fbf98, 0xc93fbf90, 0xc53fbf88,    \
 553                      0xc13fbf80, 0xcc3fbf78, 0xc83fbf70, 0xc43fbf68,    \
 554                      0xc03fbf60, 0xfc3fbf58, 0xf83fbf50, 0xf43fbf48,    \
 555                      0xf03fbf40, 0x01000000, 0x01000000, 0x01000000,    \
 556                      0x01000000, 0x91580000, 0xd027bf50, 0x93500000,    \
 557                      0xd027bf4c, 0x91480000, 0xd027bf48, 0x91400000,    \
 558                      0xd027bf44, 0xda03a058, 0xd803a054, 0xd603a050,    \
 559                      0xd403a04c, 0xd203a048, 0x40000000, 0xd003a044,    \
 560                      0x01000000, 0x91d02001, 0x01000000, 0x01000000}
 561
 562 #define CALL_DUMMY_LENGTH 192
 563
 564 #define CALL_DUMMY_START_OFFSET 148
 565
 566 #define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + (8 * 4))
 567
 568 #define CALL_DUMMY_STACK_ADJUST 68
 569
 570 /* Insert the specified number of args and function address
 571    into a call sequence of the above form stored at DUMMYNAME.
 572
 573    For structs and unions, if the function was compiled with Sun cc,
 574    it expects 'unimp' after the call.  But gcc doesn't use that
 575    (twisted) convention.  So leave a nop there for gcc (FIX_CALL_DUMMY
 576    can assume it is operating on a pristine CALL_DUMMY, not one that
 577    has already been customized for a different function).  */
 578
 579 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
 580 {                                                                       \
 581   *(int *)((char *) dummyname+168) = (0x40000000|((fun-(pc+168))>>2));  \
 582   if (!gcc_p                                                            \
 583       && (TYPE_CODE (type) == TYPE_CODE_STRUCT                          \
 584           || TYPE_CODE (type) == TYPE_CODE_UNION))                      \
 585     *(int *)((char *) dummyname+176) = (TYPE_LENGTH (type) & 0x1fff);   \
 586 }
 587
 588 \f
 589 /* Sparc has no reliable single step ptrace call */
 590
 591 #define NO_SINGLE_STEP 1
 592 extern void single_step PARAMS ((int));
 593
 594 /* We need more arguments in a frame specification for the
 595    "frame" or "info frame" command.  */
 596
 597 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
 598 extern struct frame_info *setup_arbitrary_frame PARAMS ((int, CORE_ADDR *));
 599
 600 /* To print every pair of float registers as a double, we use this hook.  */
 601
 602 #define PRINT_REGISTER_HOOK(regno)      \
 603   if (((regno) >= FP0_REGNUM)           \
 604    && ((regno) <  FP0_REGNUM + 32)      \
 605    && (0 == ((regno) & 1))) {           \
 606     char doublereg[8];          /* two float regs */    \
 607     if (!read_relative_register_raw_bytes ((regno)  , doublereg  )      \
 608      && !read_relative_register_raw_bytes ((regno)+1, doublereg+4)) {   \
 609       printf("\t");                     \
 610       print_floating (doublereg, builtin_type_double, stdout);  \
 611     }                                   \
 612   }
 613
 614 /* Optimization for storing registers to the inferior.  The hook
 615    DO_DEFERRED_STORES
 616    actually executes any deferred stores.  It is called any time
 617    we are going to proceed the child, or read its registers.
 618    The hook CLEAR_DEFERRED_STORES is called when we want to throw
 619    away the inferior process, e.g. when it dies or we kill it.
 620    FIXME, this does not handle remote debugging cleanly.  */
 621
 622 extern int deferred_stores;
 623 #define DO_DEFERRED_STORES      \
 624   if (deferred_stores)          \
 625     target_store_registers (-2);
 626 #define CLEAR_DEFERRED_STORES   \
 627   deferred_stores = 0;