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    v9 does not have such critters though.  */
 128 #define ABOUT_TO_RETURN(pc) \
 129   ((read_memory_integer (pc, 4)|0x00040000) == 0x81c7e008)
 130
 131 /* Say how long (ordinary) registers are.  This is a piece of bogosity
 132    used in push_word and a few other places; REGISTER_RAW_SIZE is the
 133    real way to know how big a register is.  */
 134
 135 #define REGISTER_SIZE 4
 136
 137 /* Number of machine registers */
 138
 139 #define NUM_REGS 72
 140
 141 /* Initializer for an array of names of registers.
 142    There should be NUM_REGS strings in this initializer.  */
 143
 144 #define REGISTER_NAMES  \
 145 { "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",       \
 146   "o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",       \
 147   "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",       \
 148   "i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7",       \
 149                                                                 \
 150   "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",       \
 151   "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
 152   "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",       \
 153   "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",       \
 154                                                                 \
 155   "y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr" }
 156
 157 /* Register numbers of various important registers.
 158    Note that some of these values are "real" register numbers,
 159    and correspond to the general registers of the machine,
 160    and some are "phony" register numbers which are too large
 161    to be actual register numbers as far as the user is concerned
 162    but do serve to get the desired values when passed to read_register.  */
 163
 164 #define G0_REGNUM 0             /* %g0 */
 165 #define G1_REGNUM 1             /* %g1 */
 166 #define O0_REGNUM 8             /* %o0 */
 167 #define SP_REGNUM 14            /* Contains address of top of stack, \
 168                                    which is also the bottom of the frame.  */
 169 #define RP_REGNUM 15            /* Contains return address value, *before* \
 170                                    any windows get switched.  */
 171 #define O7_REGNUM 15            /* Last local reg not saved on stack frame */
 172 #define L0_REGNUM 16            /* First local reg that's saved on stack frame
 173                                    rather than in machine registers */
 174 #define I0_REGNUM 24            /* %i0 */
 175 #define FP_REGNUM 30            /* Contains address of executing stack frame */
 176 #define I7_REGNUM 31            /* Last local reg saved on stack frame */
 177 #define FP0_REGNUM 32           /* Floating point register 0 */
 178 #define Y_REGNUM 64             /* Temp register for multiplication, etc.  */
 179 #define PS_REGNUM 65            /* Contains processor status */
 180 #define WIM_REGNUM 66           /* Window Invalid Mask (not really supported) */
 181 #define TBR_REGNUM 67           /* Trap Base Register (not really supported) */
 182 #define PC_REGNUM 68            /* Contains program counter */
 183 #define NPC_REGNUM 69           /* Contains next PC */
 184 #define FPS_REGNUM 70           /* Floating point status register */
 185 #define CPS_REGNUM 71           /* Coprocessor status register */
 186
 187 /* Total amount of space needed to store our copies of the machine's
 188    register state, the array `registers'.  On the sparc, `registers'
 189    contains the ins and locals, even though they are saved on the
 190    stack rather than with the other registers, and this causes hair
 191    and confusion in places like pop_frame.  It might be
 192    better to remove the ins and locals from `registers', make sure
 193    that get_saved_register can get them from the stack (even in the
 194    innermost frame), and make this the way to access them.  For the
 195    frame pointer we would do that via TARGET_READ_FP.  On the other hand,
 196    that is likely to be confusing or worse for flat frames.  */
 197
 198 #define REGISTER_BYTES (32*4+32*4+8*4)
 199
 200 /* Index within `registers' of the first byte of the space for
 201    register N.  */
 202 /* ?? */
 203 #define REGISTER_BYTE(N)  ((N)*4)
 204
 205 /* We need to override GET_SAVED_REGISTER so that we can deal with the way
 206    outs change into ins in different frames.  HAVE_REGISTER_WINDOWS can't
 207    deal with this case and also handle flat frames at the same time.  */
 208
 209 #define GET_SAVED_REGISTER 1
 210
 211 /* Number of bytes of storage in the actual machine representation
 212    for register N.  */
 213
 214 /* On the SPARC, all regs are 4 bytes.  */
 215
 216 #define REGISTER_RAW_SIZE(N) (4)
 217
 218 /* Number of bytes of storage in the program's representation
 219    for register N.  */
 220
 221 /* On the SPARC, all regs are 4 bytes.  */
 222
 223 #define REGISTER_VIRTUAL_SIZE(N) (4)
 224
 225 /* Largest value REGISTER_RAW_SIZE can have.  */
 226
 227 #define MAX_REGISTER_RAW_SIZE 8
 228
 229 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 230
 231 #define MAX_REGISTER_VIRTUAL_SIZE 8
 232
 233 /* Return the GDB type object for the "standard" data type
 234    of data in register N.  */
 235
 236 #define REGISTER_VIRTUAL_TYPE(N) \
 237  ((N) < 32 ? builtin_type_int : (N) < 64 ? builtin_type_float : \
 238   builtin_type_int)
 239
 240 /* Writing to %g0 is a noop (not an error or exception or anything like
 241    that, however).  */
 242
 243 #define CANNOT_STORE_REGISTER(regno) ((regno) == G0_REGNUM)
 244
 245 /* Store the address of the place in which to copy the structure the
 246    subroutine will return.  This is called from call_function. */
 247
 248 #define STORE_STRUCT_RETURN(ADDR, SP) \
 249   { target_write_memory ((SP)+(16*4), (char *)&(ADDR), 4); }
 250
 251 /* Extract from an array REGBUF containing the (raw) register state
 252    a function return value of type TYPE, and copy that, in virtual format,
 253    into VALBUF.  */
 254
 255 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF)              \
 256   {                                                                        \
 257     if (TYPE_CODE (TYPE) == TYPE_CODE_FLT)                                 \
 258       {                                                                    \
 259         memcpy ((VALBUF), ((int *)(REGBUF))+FP0_REGNUM, TYPE_LENGTH(TYPE));\
 260       }                                                                    \
 261     else                                                                   \
 262       memcpy ((VALBUF),                                                    \
 263               (char *)(REGBUF) + REGISTER_RAW_SIZE (O0_REGNUM) * 8 +       \
 264               (TYPE_LENGTH(TYPE) >= REGISTER_RAW_SIZE (O0_REGNUM)          \
 265                ? 0 : REGISTER_RAW_SIZE (O0_REGNUM) - TYPE_LENGTH(TYPE)),   \
 266               TYPE_LENGTH(TYPE));                                          \
 267   }
 268
 269 /* Write into appropriate registers a function return value
 270    of type TYPE, given in virtual format.  */
 271 /* On sparc, values are returned in register %o0.  */
 272 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 273   {                                                                          \
 274     if (TYPE_CODE (TYPE) == TYPE_CODE_FLT)                                   \
 275       /* Floating-point values are returned in the register pair */          \
 276       /* formed by %f0 and %f1 (doubles are, anyway).  */                    \
 277       write_register_bytes (REGISTER_BYTE (FP0_REGNUM), (VALBUF),            \
 278                             TYPE_LENGTH (TYPE));                             \
 279     else                                                                     \
 280       /* Other values are returned in register %o0.  */                      \
 281       write_register_bytes (REGISTER_BYTE (O0_REGNUM), (VALBUF),             \
 282                             TYPE_LENGTH (TYPE));  \
 283   }
 284
 285 /* Extract from an array REGBUF containing the (raw) register state
 286    the address in which a function should return its structure value,
 287    as a CORE_ADDR (or an expression that can be used as one).  */
 288
 289 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
 290   (sparc_extract_struct_value_address (REGBUF))
 291
 292 extern CORE_ADDR
 293 sparc_extract_struct_value_address PARAMS ((char [REGISTER_BYTES]));
 294
 295 \f
 296 /* Describe the pointer in each stack frame to the previous stack frame
 297    (its caller).  */
 298
 299 /* FRAME_CHAIN takes a frame's nominal address
 300    and produces the frame's chain-pointer. */
 301
 302 /* In the case of the Sun 4, the frame-chain's nominal address
 303    is held in the frame pointer register.
 304
 305    On the Sun4, the frame (in %fp) is %sp for the previous frame.
 306    From the previous frame's %sp, we can find the previous frame's
 307    %fp: it is in the save area just above the previous frame's %sp.
 308
 309    If we are setting up an arbitrary frame, we'll need to know where
 310    it ends.  Hence the following.  This part of the frame cache
 311    structure should be checked before it is assumed that this frame's
 312    bottom is in the stack pointer.
 313
 314    If there isn't a frame below this one, the bottom of this frame is
 315    in the stack pointer.
 316
 317    If there is a frame below this one, and the frame pointers are
 318    identical, it's a leaf frame and the bottoms are the same also.
 319
 320    Otherwise the bottom of this frame is the top of the next frame.
 321
 322    The bottom field is misnamed, since it might imply that memory from
 323    bottom to frame contains this frame.  That need not be true if
 324    stack frames are allocated in different segments (e.g. some on a
 325    stack, some on a heap in the data segment).
 326
 327    GCC 2.6 and later can generate ``flat register window'' code that
 328    makes frames by explicitly saving those registers that need to be
 329    saved.  %i7 is used as the frame pointer, and the frame is laid out so
 330    that flat and non-flat calls can be intermixed freely within a
 331    program.  Unfortunately for GDB, this means it must detect and record
 332    the flatness of frames.
 333
 334    Since the prologue in a flat frame also tells us where fp and pc
 335    have been stashed (the frame is of variable size, so their location
 336    is not fixed), it's convenient to record them in the frame info.  */
 337
 338 #define EXTRA_FRAME_INFO  \
 339   CORE_ADDR bottom;  \
 340   int flat;  \
 341   /* Following fields only relevant for flat frames.  */ \
 342   CORE_ADDR pc_addr;  \
 343   CORE_ADDR fp_addr;  \
 344   /* Add this to ->frame to get the value of the stack pointer at the */ \
 345   /* time of the register saves.  */ \
 346   int sp_offset;
 347
 348 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) \
 349   sparc_init_extra_frame_info (fromleaf, fci)
 350 extern void sparc_init_extra_frame_info ();
 351
 352 #define PRINT_EXTRA_FRAME_INFO(fi) \
 353   { \
 354     if ((fi) && (fi)->flat) \
 355       printf_filtered (" flat, pc saved at 0x%x, fp saved at 0x%x\n", \
 356                        (fi)->pc_addr, (fi)->fp_addr); \
 357   }
 358
 359 #ifdef __STDC__
 360 struct frame_info;
 361 #endif
 362
 363 #define FRAME_CHAIN(thisframe) (sparc_frame_chain (thisframe))
 364 extern CORE_ADDR sparc_frame_chain PARAMS ((struct frame_info *));
 365
 366 /* INIT_EXTRA_FRAME_INFO needs the PC to detect flat frames.  */
 367
 368 #define INIT_FRAME_PC(fromleaf, prev) /* nothing */
 369 #define INIT_FRAME_PC_FIRST(fromleaf, prev) \
 370   (prev)->pc = ((fromleaf) ? SAVED_PC_AFTER_CALL ((prev)->next) : \
 371               (prev)->next ? FRAME_SAVED_PC ((prev)->next) : read_pc ());
 372
 373 /* Define other aspects of the stack frame.  */
 374
 375 /* A macro that tells us whether the function invocation represented
 376    by FI does not have a frame on the stack associated with it.  If it
 377    does not, FRAMELESS is set to 1, else 0.  */
 378 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 379   (FRAMELESS) = frameless_look_for_prologue(FI)
 380
 381 /* The location of I0 w.r.t SP.  This is actually dependent on how the system's
 382    window overflow/underflow routines are written.  Most vendors save the L regs
 383    followed by the I regs (at the higher address).  Some vendors get it wrong.
 384  */
 385
 386 #define FRAME_SAVED_L0  0
 387 #define FRAME_SAVED_I0  (8 * REGISTER_RAW_SIZE (L0_REGNUM))
 388
 389 /* Where is the PC for a specific frame */
 390
 391 #define FRAME_SAVED_PC(FRAME) sparc_frame_saved_pc (FRAME)
 392 extern CORE_ADDR sparc_frame_saved_pc ();
 393
 394 /* If the argument is on the stack, it will be here.  */
 395 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 396
 397 #define FRAME_STRUCT_ARGS_ADDRESS(fi) ((fi)->frame)
 398
 399 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 400
 401 /* Set VAL to the number of args passed to frame described by FI.
 402    Can set VAL to -1, meaning no way to tell.  */
 403
 404 /* We can't tell how many args there are
 405    now that the C compiler delays popping them.  */
 406 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 407
 408 /* Return number of bytes at start of arglist that are not really args.  */
 409
 410 #define FRAME_ARGS_SKIP 68
 411 \f
 412 /* Things needed for making the inferior call functions.  */
 413 /*
 414  * First of all, let me give my opinion of what the DUMMY_FRAME
 415  * actually looks like.
 416  *
 417  *               |                                 |
 418  *               |                                 |
 419  *               + - - - - - - - - - - - - - - - - +<-- fp (level 0)
 420  *               |                                 |
 421  *               |                                 |
 422  *               |                                 |
 423  *               |                                 |
 424  *               |  Frame of innermost program     |
 425  *               |           function              |
 426  *               |                                 |
 427  *               |                                 |
 428  *               |                                 |
 429  *               |                                 |
 430  *               |                                 |
 431  *               |---------------------------------|<-- sp (level 0), fp (c)
 432  *               |                                 |
 433  *     DUMMY     |             fp0-31              |
 434  *               |                                 |
 435  *               |             ------              |<-- fp - 0x80
 436  *     FRAME     |              g0-7               |<-- fp - 0xa0
 437  *               |              i0-7               |<-- fp - 0xc0
 438  *               |             other               |<-- fp - 0xe0
 439  *               |               ?                 |
 440  *               |               ?                 |
 441  *               |---------------------------------|<-- sp' = fp - 0x140
 442  *               |                                 |
 443  * xcution start |                                 |
 444  * sp' + 0x94 -->|        CALL_DUMMY (x code)      |
 445  *               |                                 |
 446  *               |                                 |
 447  *               |---------------------------------|<-- sp'' = fp - 0x200
 448  *               |  align sp to 8 byte boundary    |
 449  *               |     ==> args to fn <==          |
 450  *  Room for     |                                 |
 451  * i & l's + agg | CALL_DUMMY_STACK_ADJUST = 0x0x44|
 452  *               |---------------------------------|<-- final sp (variable)
 453  *               |                                 |
 454  *               |   Where function called will    |
 455  *               |           build frame.          |
 456  *               |                                 |
 457  *               |                                 |
 458  *
 459  *   I understand everything in this picture except what the space
 460  * between fp - 0xe0 and fp - 0x140 is used for.  Oh, and I don't
 461  * understand why there's a large chunk of CALL_DUMMY that never gets
 462  * executed (its function is superceeded by PUSH_DUMMY_FRAME; they
 463  * are designed to do the same thing).
 464  *
 465  *   PUSH_DUMMY_FRAME saves the registers above sp' and pushes the
 466  * register file stack down one.
 467  *
 468  *   call_function then writes CALL_DUMMY, pushes the args onto the
 469  * stack, and adjusts the stack pointer.
 470  *
 471  *   run_stack_dummy then starts execution (in the middle of
 472  * CALL_DUMMY, as directed by call_function).
 473  */
 474
 475 /* Push an empty stack frame, to record the current PC, etc.  */
 476
 477 #define PUSH_DUMMY_FRAME        sparc_push_dummy_frame ()
 478 #define POP_FRAME       sparc_pop_frame ()
 479
 480 void sparc_push_dummy_frame (), sparc_pop_frame ();
 481 /* This sequence of words is the instructions
 482
 483    save %sp,-0x140,%sp
 484    std  %f30,[%fp-0x08]
 485    std  %f28,[%fp-0x10]
 486    std  %f26,[%fp-0x18]
 487    std  %f24,[%fp-0x20]
 488    std  %f22,[%fp-0x28]
 489    std  %f20,[%fp-0x30]
 490    std  %f18,[%fp-0x38]
 491    std  %f16,[%fp-0x40]
 492    std  %f14,[%fp-0x48]
 493    std  %f12,[%fp-0x50]
 494    std  %f10,[%fp-0x58]
 495    std  %f8,[%fp-0x60]
 496    std  %f6,[%fp-0x68]
 497    std  %f4,[%fp-0x70]
 498    std  %f2,[%fp-0x78]
 499    std  %f0,[%fp-0x80]
 500    std  %g6,[%fp-0x88]
 501    std  %g4,[%fp-0x90]
 502    std  %g2,[%fp-0x98]
 503    std  %g0,[%fp-0xa0]
 504    std  %i6,[%fp-0xa8]
 505    std  %i4,[%fp-0xb0]
 506    std  %i2,[%fp-0xb8]
 507    std  %i0,[%fp-0xc0]
 508    nop ! stcsr  [%fp-0xc4]
 509    nop ! stfsr  [%fp-0xc8]
 510    nop ! wr     %npc,[%fp-0xcc]
 511    nop ! wr     %pc,[%fp-0xd0]
 512    rd   %tbr,%o0
 513    st   %o0,[%fp-0xd4]
 514    rd   %wim,%o1
 515    st   %o0,[%fp-0xd8]
 516    rd   %psr,%o0
 517    st   %o0,[%fp-0xdc]
 518    rd   %y,%o0
 519    st   %o0,[%fp-0xe0]
 520
 521      /..* The arguments are pushed at this point by GDB;
 522         no code is needed in the dummy for this.
 523         The CALL_DUMMY_START_OFFSET gives the position of
 524         the following ld instruction.  *../
 525
 526    ld   [%sp+0x58],%o5
 527    ld   [%sp+0x54],%o4
 528    ld   [%sp+0x50],%o3
 529    ld   [%sp+0x4c],%o2
 530    ld   [%sp+0x48],%o1
 531    call 0x00000000
 532    ld   [%sp+0x44],%o0
 533    nop
 534    ta 1
 535    nop
 536
 537    note that this is 192 bytes, which is a multiple of 8 (not only 4) bytes.
 538    note that the `call' insn is a relative, not an absolute call.
 539    note that the `nop' at the end is needed to keep the trap from
 540         clobbering things (if NPC pointed to garbage instead).
 541
 542 We actually start executing at the `sethi', since the pushing of the
 543 registers (as arguments) is done by PUSH_DUMMY_FRAME.  If this were
 544 real code, the arguments for the function called by the CALL would be
 545 pushed between the list of ST insns and the CALL, and we could allow
 546 it to execute through.  But the arguments have to be pushed by GDB
 547 after the PUSH_DUMMY_FRAME is done, and we cannot allow these ST
 548 insns to be performed again, lest the registers saved be taken for
 549 arguments.  */
 550
 551 #define CALL_DUMMY { 0x9de3bee0, 0xfd3fbff8, 0xf93fbff0, 0xf53fbfe8,    \
 552                      0xf13fbfe0, 0xed3fbfd8, 0xe93fbfd0, 0xe53fbfc8,    \
 553                      0xe13fbfc0, 0xdd3fbfb8, 0xd93fbfb0, 0xd53fbfa8,    \
 554                      0xd13fbfa0, 0xcd3fbf98, 0xc93fbf90, 0xc53fbf88,    \
 555                      0xc13fbf80, 0xcc3fbf78, 0xc83fbf70, 0xc43fbf68,    \
 556                      0xc03fbf60, 0xfc3fbf58, 0xf83fbf50, 0xf43fbf48,    \
 557                      0xf03fbf40, 0x01000000, 0x01000000, 0x01000000,    \
 558                      0x01000000, 0x91580000, 0xd027bf50, 0x93500000,    \
 559                      0xd027bf4c, 0x91480000, 0xd027bf48, 0x91400000,    \
 560                      0xd027bf44, 0xda03a058, 0xd803a054, 0xd603a050,    \
 561                      0xd403a04c, 0xd203a048, 0x40000000, 0xd003a044,    \
 562                      0x01000000, 0x91d02001, 0x01000000, 0x01000000}
 563
 564 #define CALL_DUMMY_LENGTH 192
 565
 566 #define CALL_DUMMY_START_OFFSET 148
 567
 568 #define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + (8 * 4))
 569
 570 #define CALL_DUMMY_STACK_ADJUST 68
 571
 572 /* Insert the specified number of args and function address
 573    into a call sequence of the above form stored at DUMMYNAME.
 574
 575    For structs and unions, if the function was compiled with Sun cc,
 576    it expects 'unimp' after the call.  But gcc doesn't use that
 577    (twisted) convention.  So leave a nop there for gcc (FIX_CALL_DUMMY
 578    can assume it is operating on a pristine CALL_DUMMY, not one that
 579    has already been customized for a different function).  */
 580
 581 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)    \
 582 {                                                                       \
 583   store_unsigned_integer (dummyname + 168, 4,                           \
 584                           0x40000000 | ((fun - (pc + 168)) >> 2));      \
 585   if (!gcc_p                                                            \
 586       && (TYPE_CODE (type) == TYPE_CODE_STRUCT                          \
 587           || TYPE_CODE (type) == TYPE_CODE_UNION))                      \
 588     store_unsigned_integer (dummyname + 176, 4, TYPE_LENGTH (type) & 0x1fff); \
 589 }
 590
 591 \f
 592 /* Sparc has no reliable single step ptrace call */
 593
 594 #define NO_SINGLE_STEP 1
 595 extern void single_step PARAMS ((int));
 596
 597 /* We need more arguments in a frame specification for the
 598    "frame" or "info frame" command.  */
 599
 600 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
 601 extern struct frame_info *setup_arbitrary_frame PARAMS ((int, CORE_ADDR *));
 602
 603 /* To print every pair of float registers as a double, we use this hook.  */
 604
 605 #define PRINT_REGISTER_HOOK(regno)      \
 606   if (((regno) >= FP0_REGNUM)           \
 607    && ((regno) <  FP0_REGNUM + 32)      \
 608    && (0 == ((regno) & 1))) {           \
 609     char doublereg[8];          /* two float regs */    \
 610     if (!read_relative_register_raw_bytes ((regno)  , doublereg  )      \
 611      && !read_relative_register_raw_bytes ((regno)+1, doublereg+4)) {   \
 612       printf("\t");                     \
 613       print_floating (doublereg, builtin_type_double, stdout);  \
 614     }                                   \
 615   }
 616
 617 /* Optimization for storing registers to the inferior.  The hook
 618    DO_DEFERRED_STORES
 619    actually executes any deferred stores.  It is called any time
 620    we are going to proceed the child, or read its registers.
 621    The hook CLEAR_DEFERRED_STORES is called when we want to throw
 622    away the inferior process, e.g. when it dies or we kill it.
 623    FIXME, this does not handle remote debugging cleanly.  */
 624
 625 extern int deferred_stores;
 626 #define DO_DEFERRED_STORES      \
 627   if (deferred_stores)          \
 628     target_store_registers (-2);
 629 #define CLEAR_DEFERRED_STORES   \
 630   deferred_stores = 0;