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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  22
  23 #ifdef __STDC__
  24 struct frame_info;
  25 struct type;
  26 struct value;
  27 #endif
  28
  29 #define TARGET_BYTE_ORDER BIG_ENDIAN
  30
  31 /* Floating point is IEEE compatible.  */
  32 #define IEEE_FLOAT
  33
  34 /* If an argument is declared "register", Sun cc will keep it in a register,
  35    never saving it onto the stack.  So we better not believe the "p" symbol
  36    descriptor stab.  */
  37
  38 #define USE_REGISTER_NOT_ARG
  39
  40 /* When passing a structure to a function, Sun cc passes the address
  41    not the structure itself.  It (under SunOS4) creates two symbols,
  42    which we need to combine to a LOC_REGPARM.  Gcc version two (as of
  43    1.92) behaves like sun cc.  REG_STRUCT_HAS_ADDR is smart enough to
  44    distinguish between Sun cc, gcc version 1 and gcc version 2.  */
  45
  46 #define REG_STRUCT_HAS_ADDR(gcc_p,type) (gcc_p != 1)
  47
  48 /* Sun /bin/cc gets this right as of SunOS 4.1.x.  We need to define
  49    BELIEVE_PCC_PROMOTION to get this right now that the code which
  50    detects gcc2_compiled. is broken.  This loses for SunOS 4.0.x and
  51    earlier.  */
  52
  53 #define BELIEVE_PCC_PROMOTION 1
  54
  55 /* For acc, there's no need to correct LBRAC entries by guessing how
  56    they should work.  In fact, this is harmful because the LBRAC
  57    entries now all appear at the end of the function, not intermixed
  58    with the SLINE entries.  n_opt_found detects acc for Solaris binaries;
  59    function_stab_type detects acc for SunOS4 binaries.
  60
  61    For binary from SunOS4 /bin/cc, need to correct LBRAC's.
  62
  63    For gcc, like acc, don't correct.  */
  64
  65 #define SUN_FIXED_LBRAC_BUG \
  66   (n_opt_found \
  67    || function_stab_type == N_STSYM \
  68    || function_stab_type == N_GSYM \
  69    || processing_gcc_compilation)
  70
  71 /* Do variables in the debug stabs occur after the N_LBRAC or before it?
  72    acc: after, gcc: before, SunOS4 /bin/cc: before.  */
  73
  74 #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) \
  75   (!(gcc_p) \
  76    && (n_opt_found \
  77        || function_stab_type == N_STSYM \
  78        || function_stab_type == N_GSYM))
  79
  80 /* Offset from address of function to start of its code.
  81    Zero on most machines.  */
  82
  83 #define FUNCTION_START_OFFSET 0
  84
  85 /* Advance PC across any function entry prologue instructions
  86    to reach some "real" code.  SKIP_PROLOGUE_FRAMELESS_P advances
  87    the PC past some of the prologue, but stops as soon as it
  88    knows that the function has a frame.  Its result is equal
  89    to its input PC if the function is frameless, unequal otherwise.  */
  90
  91 #define SKIP_PROLOGUE(pc) \
  92   { pc = skip_prologue (pc, 0); }
  93 #define SKIP_PROLOGUE_FRAMELESS_P(pc) \
  94   { pc = skip_prologue (pc, 1); }
  95 extern CORE_ADDR skip_prologue PARAMS ((CORE_ADDR, int));
  96
  97 /* Immediately after a function call, return the saved pc.
  98    Can't go through the frames for this because on some machines
  99    the new frame is not set up until the new function executes
 100    some instructions.  */
 101
 102 /* On the Sun 4 under SunOS, the compile will leave a fake insn which
 103    encodes the structure size being returned.  If we detect such
 104    a fake insn, step past it.  */
 105
 106 #define PC_ADJUST(pc) sparc_pc_adjust(pc)
 107 extern CORE_ADDR sparc_pc_adjust PARAMS ((CORE_ADDR));
 108
 109 #define SAVED_PC_AFTER_CALL(frame) PC_ADJUST (read_register (RP_REGNUM))
 110
 111 /* Stack grows downward.  */
 112
 113 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
 114
 115 /* Stack must be aligned on 64-bit boundaries when synthesizing
 116    function calls. */
 117
 118 #define STACK_ALIGN(ADDR) (((ADDR) + 7) & -8)
 119
 120 /* Sequence of bytes for breakpoint instruction (ta 1). */
 121
 122 #define BREAKPOINT {0x91, 0xd0, 0x20, 0x01}
 123
 124 /* Amount PC must be decremented by after a breakpoint.
 125    This is often the number of bytes in BREAKPOINT
 126    but not always.  */
 127
 128 #define DECR_PC_AFTER_BREAK 0
 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 PS_FLAG_CARRY 0x100000  /* Carry bit in PS */
 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 #ifdef __STDC__
 210 struct frame_info;
 211 enum lval_type;
 212 #endif
 213 void sparc_get_saved_register PARAMS ((char *raw_buffer, int *optimized, CORE_ADDR *addrp, struct frame_info *frame, int regnum, enum lval_type *lvalp));
 214 #define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \
 215       sparc_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
 216
 217 /* Number of bytes of storage in the actual machine representation
 218    for register N.  */
 219
 220 /* On the SPARC, all regs are 4 bytes.  */
 221
 222 #define REGISTER_RAW_SIZE(N) (4)
 223
 224 /* Number of bytes of storage in the program's representation
 225    for register N.  */
 226
 227 /* On the SPARC, all regs are 4 bytes.  */
 228
 229 #define REGISTER_VIRTUAL_SIZE(N) (4)
 230
 231 /* Largest value REGISTER_RAW_SIZE can have.  */
 232
 233 #define MAX_REGISTER_RAW_SIZE 8
 234
 235 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 236
 237 #define MAX_REGISTER_VIRTUAL_SIZE 8
 238
 239 /* Return the GDB type object for the "standard" data type
 240    of data in register N.  */
 241
 242 #define REGISTER_VIRTUAL_TYPE(N) \
 243  ((N) < 32 ? builtin_type_int : (N) < 64 ? builtin_type_float : \
 244   builtin_type_int)
 245
 246 /* Writing to %g0 is a noop (not an error or exception or anything like
 247    that, however).  */
 248
 249 #define CANNOT_STORE_REGISTER(regno) ((regno) == G0_REGNUM)
 250
 251 /* Store the address of the place in which to copy the structure the
 252    subroutine will return.  This is called from call_function_by_hand.
 253    The ultimate mystery is, tho, what is the value "16"?  */
 254
 255 #define STORE_STRUCT_RETURN(ADDR, SP) \
 256   { char val[4]; \
 257     store_unsigned_integer (val, 4, (ADDR)); \
 258     write_memory ((SP)+(16*4), val, 4); }
 259
 260 /* Extract from an array REGBUF containing the (raw) register state
 261    a function return value of type TYPE, and copy that, in virtual format,
 262    into VALBUF.  */
 263
 264 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 265   sparc_extract_return_value(TYPE, REGBUF, VALBUF)
 266 extern void
 267 sparc_extract_return_value PARAMS ((struct type *, char [], char *));
 268
 269 /* Write into appropriate registers a function return value
 270    of type TYPE, given in virtual format.  */
 271 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 272   sparc_store_return_value(TYPE, VALBUF)
 273 extern void sparc_store_return_value PARAMS ((struct type *, char *));
 274
 275 /* Extract from an array REGBUF containing the (raw) register state
 276    the address in which a function should return its structure value,
 277    as a CORE_ADDR (or an expression that can be used as one).  */
 278
 279 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
 280   (sparc_extract_struct_value_address (REGBUF))
 281
 282 extern CORE_ADDR
 283 sparc_extract_struct_value_address PARAMS ((char [REGISTER_BYTES]));
 284
 285 \f
 286 /* Describe the pointer in each stack frame to the previous stack frame
 287    (its caller).  */
 288
 289 /* FRAME_CHAIN takes a frame's nominal address
 290    and produces the frame's chain-pointer. */
 291
 292 /* In the case of the Sun 4, the frame-chain's nominal address
 293    is held in the frame pointer register.
 294
 295    On the Sun4, the frame (in %fp) is %sp for the previous frame.
 296    From the previous frame's %sp, we can find the previous frame's
 297    %fp: it is in the save area just above the previous frame's %sp.
 298
 299    If we are setting up an arbitrary frame, we'll need to know where
 300    it ends.  Hence the following.  This part of the frame cache
 301    structure should be checked before it is assumed that this frame's
 302    bottom is in the stack pointer.
 303
 304    If there isn't a frame below this one, the bottom of this frame is
 305    in the stack pointer.
 306
 307    If there is a frame below this one, and the frame pointers are
 308    identical, it's a leaf frame and the bottoms are the same also.
 309
 310    Otherwise the bottom of this frame is the top of the next frame.
 311
 312    The bottom field is misnamed, since it might imply that memory from
 313    bottom to frame contains this frame.  That need not be true if
 314    stack frames are allocated in different segments (e.g. some on a
 315    stack, some on a heap in the data segment).
 316
 317    GCC 2.6 and later can generate ``flat register window'' code that
 318    makes frames by explicitly saving those registers that need to be
 319    saved.  %i7 is used as the frame pointer, and the frame is laid out so
 320    that flat and non-flat calls can be intermixed freely within a
 321    program.  Unfortunately for GDB, this means it must detect and record
 322    the flatness of frames.
 323
 324    Since the prologue in a flat frame also tells us where fp and pc
 325    have been stashed (the frame is of variable size, so their location
 326    is not fixed), it's convenient to record them in the frame info.  */
 327
 328 #define EXTRA_FRAME_INFO  \
 329   CORE_ADDR bottom;  \
 330   int in_prologue; \
 331   int flat;  \
 332   /* Following fields only relevant for flat frames.  */ \
 333   CORE_ADDR pc_addr;  \
 334   CORE_ADDR fp_addr;  \
 335   /* Add this to ->frame to get the value of the stack pointer at the */ \
 336   /* time of the register saves.  */ \
 337   int sp_offset;
 338
 339 #define FRAME_INIT_SAVED_REGS(fp) /*no-op*/
 340
 341 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) \
 342   sparc_init_extra_frame_info (fromleaf, fci)
 343 extern void sparc_init_extra_frame_info PARAMS((int, struct frame_info *));
 344
 345 #define PRINT_EXTRA_FRAME_INFO(fi) \
 346   { \
 347     if ((fi) && (fi)->flat) \
 348       printf_filtered (" flat, pc saved at 0x%x, fp saved at 0x%x\n", \
 349                        (fi)->pc_addr, (fi)->fp_addr); \
 350   }
 351
 352 #define FRAME_CHAIN(thisframe) (sparc_frame_chain (thisframe))
 353 extern CORE_ADDR sparc_frame_chain PARAMS ((struct frame_info *));
 354
 355 /* INIT_EXTRA_FRAME_INFO needs the PC to detect flat frames.  */
 356
 357 #define INIT_FRAME_PC(fromleaf, prev) /* nothing */
 358 #define INIT_FRAME_PC_FIRST(fromleaf, prev) \
 359   (prev)->pc = ((fromleaf) ? SAVED_PC_AFTER_CALL ((prev)->next) : \
 360               (prev)->next ? FRAME_SAVED_PC ((prev)->next) : read_pc ());
 361
 362 /* Define other aspects of the stack frame.  */
 363
 364 /* A macro that tells us whether the function invocation represented
 365    by FI does not have a frame on the stack associated with it.  If it
 366    does not, FRAMELESS is set to 1, else 0.  */
 367 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 368   (FRAMELESS) = frameless_look_for_prologue(FI)
 369
 370 /* The location of I0 w.r.t SP.  This is actually dependent on how the system's
 371    window overflow/underflow routines are written.  Most vendors save the L regs
 372    followed by the I regs (at the higher address).  Some vendors get it wrong.
 373  */
 374
 375 #define FRAME_SAVED_L0  0
 376 #define FRAME_SAVED_I0  (8 * REGISTER_RAW_SIZE (L0_REGNUM))
 377
 378 /* Where is the PC for a specific frame */
 379
 380 #define FRAME_SAVED_PC(FRAME) sparc_frame_saved_pc (FRAME)
 381 extern CORE_ADDR sparc_frame_saved_pc PARAMS ((struct frame_info *));
 382
 383 /* If the argument is on the stack, it will be here.  */
 384 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 385
 386 #define FRAME_STRUCT_ARGS_ADDRESS(fi) ((fi)->frame)
 387
 388 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 389
 390 /* Set VAL to the number of args passed to frame described by FI.
 391    Can set VAL to -1, meaning no way to tell.  */
 392
 393 /* We can't tell how many args there are
 394    now that the C compiler delays popping them.  */
 395 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 396
 397 /* Return number of bytes at start of arglist that are not really args.  */
 398
 399 #define FRAME_ARGS_SKIP 68
 400 \f
 401 /* Things needed for making the inferior call functions.  */
 402 /*
 403  * First of all, let me give my opinion of what the DUMMY_FRAME
 404  * actually looks like.
 405  *
 406  *               |                                 |
 407  *               |                                 |
 408  *               + - - - - - - - - - - - - - - - - +<-- fp (level 0)
 409  *               |                                 |
 410  *               |                                 |
 411  *               |                                 |
 412  *               |                                 |
 413  *               |  Frame of innermost program     |
 414  *               |           function              |
 415  *               |                                 |
 416  *               |                                 |
 417  *               |                                 |
 418  *               |                                 |
 419  *               |                                 |
 420  *               |---------------------------------|<-- sp (level 0), fp (c)
 421  *               |                                 |
 422  *     DUMMY     |             fp0-31              |
 423  *               |                                 |
 424  *               |             ------              |<-- fp - 0x80
 425  *     FRAME     |              g0-7               |<-- fp - 0xa0
 426  *               |              i0-7               |<-- fp - 0xc0
 427  *               |             other               |<-- fp - 0xe0
 428  *               |               ?                 |
 429  *               |               ?                 |
 430  *               |---------------------------------|<-- sp' = fp - 0x140
 431  *               |                                 |
 432  * xcution start |                                 |
 433  * sp' + 0x94 -->|        CALL_DUMMY (x code)      |
 434  *               |                                 |
 435  *               |                                 |
 436  *               |---------------------------------|<-- sp'' = fp - 0x200
 437  *               |  align sp to 8 byte boundary    |
 438  *               |     ==> args to fn <==          |
 439  *  Room for     |                                 |
 440  * i & l's + agg | CALL_DUMMY_STACK_ADJUST = 0x0x44|
 441  *               |---------------------------------|<-- final sp (variable)
 442  *               |                                 |
 443  *               |   Where function called will    |
 444  *               |           build frame.          |
 445  *               |                                 |
 446  *               |                                 |
 447  *
 448  *   I understand everything in this picture except what the space
 449  * between fp - 0xe0 and fp - 0x140 is used for.  Oh, and I don't
 450  * understand why there's a large chunk of CALL_DUMMY that never gets
 451  * executed (its function is superceeded by PUSH_DUMMY_FRAME; they
 452  * are designed to do the same thing).
 453  *
 454  *   PUSH_DUMMY_FRAME saves the registers above sp' and pushes the
 455  * register file stack down one.
 456  *
 457  *   call_function then writes CALL_DUMMY, pushes the args onto the
 458  * stack, and adjusts the stack pointer.
 459  *
 460  *   run_stack_dummy then starts execution (in the middle of
 461  * CALL_DUMMY, as directed by call_function).
 462  */
 463
 464 /* Push an empty stack frame, to record the current PC, etc.  */
 465
 466 #define PUSH_DUMMY_FRAME        sparc_push_dummy_frame ()
 467 #define POP_FRAME       sparc_pop_frame ()
 468
 469 void sparc_push_dummy_frame PARAMS ((void)), sparc_pop_frame PARAMS ((void));
 470
 471 #ifndef CALL_DUMMY
 472 /* This sequence of words is the instructions
 473
 474    0:   bc 10 00 01     mov  %g1, %fp
 475    4:   9d e3 80 00     save  %sp, %g0, %sp
 476    8:   bc 10 00 02     mov  %g2, %fp
 477    c:   be 10 00 03     mov  %g3, %i7
 478   10:   da 03 a0 58     ld  [ %sp + 0x58 ], %o5
 479   14:   d8 03 a0 54     ld  [ %sp + 0x54 ], %o4
 480   18:   d6 03 a0 50     ld  [ %sp + 0x50 ], %o3
 481   1c:   d4 03 a0 4c     ld  [ %sp + 0x4c ], %o2
 482   20:   d2 03 a0 48     ld  [ %sp + 0x48 ], %o1
 483   24:   40 00 00 00     call  <fun>
 484   28:   d0 03 a0 44     ld  [ %sp + 0x44 ], %o0
 485   2c:   01 00 00 00     nop
 486   30:   91 d0 20 01     ta  1
 487   34:   01 00 00 00     nop
 488
 489    NOTES:
 490         * the first four instructions are necessary only on the simulator.
 491         * this is a multiple of 8 (not only 4) bytes.
 492         * the `call' insn is a relative, not an absolute call.
 493         * the `nop' at the end is needed to keep the trap from
 494           clobbering things (if NPC pointed to garbage instead).
 495 */
 496
 497 #define CALL_DUMMY { 0xbc100001, 0x9de38000, 0xbc100002, 0xbe100003,    \
 498                      0xda03a058, 0xd803a054, 0xd603a050, 0xd403a04c,    \
 499                      0xd203a048, 0x40000000, 0xd003a044, 0x01000000,    \
 500                      0x91d02001, 0x01000000 }
 501
 502
 503 /* Size of the call dummy in bytes. */
 504
 505 #define CALL_DUMMY_LENGTH 0x38
 506
 507 /* Offset within call dummy of first instruction to execute. */
 508
 509 #define CALL_DUMMY_START_OFFSET 0
 510
 511 /* Offset within CALL_DUMMY of the 'call' instruction. */
 512
 513 #define CALL_DUMMY_CALL_OFFSET (CALL_DUMMY_START_OFFSET + 0x24)
 514
 515 /* Offset within CALL_DUMMY of the 'ta 1' instruction. */
 516
 517 #define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + 0x30)
 518
 519 #define CALL_DUMMY_STACK_ADJUST 68
 520
 521 #endif
 522 /* Insert the specified number of args and function address
 523    into a call sequence of the above form stored at DUMMYNAME.  */
 524
 525 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
 526  sparc_fix_call_dummy (dummyname, pc, fun, type, gcc_p)
 527 void sparc_fix_call_dummy PARAMS ((char *dummy, CORE_ADDR pc, CORE_ADDR fun,
 528                                    struct type *value_type, int using_gcc));
 529
 530 /* The Sparc returns long doubles on the stack.  */
 531
 532 #define RETURN_VALUE_ON_STACK(TYPE) \
 533   (TYPE_CODE(TYPE) == TYPE_CODE_FLT \
 534    && TYPE_LENGTH(TYPE) > 8)
 535 \f
 536 /* Sparc has no reliable single step ptrace call */
 537
 538 #define SOFTWARE_SINGLE_STEP_P 1
 539 extern void sparc_software_single_step PARAMS ((unsigned int, int));
 540 #define SOFTWARE_SINGLE_STEP(sig,bp_p) sparc_software_single_step (sig,bp_p)
 541
 542 /* We need more arguments in a frame specification for the
 543    "frame" or "info frame" command.  */
 544
 545 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
 546 extern struct frame_info *setup_arbitrary_frame PARAMS ((int, CORE_ADDR *));
 547
 548 /* To print every pair of float registers as a double, we use this hook.
 549    We also print the condition code registers in a readable format
 550    (FIXME: can expand this to all control regs).  */
 551
 552 #undef  PRINT_REGISTER_HOOK
 553 #define PRINT_REGISTER_HOOK(regno)      \
 554   sparc_print_register_hook (regno)
 555 extern void sparc_print_register_hook PARAMS ((int regno));
 556
 557
 558 /* Optimization for storing registers to the inferior.  The hook
 559    DO_DEFERRED_STORES
 560    actually executes any deferred stores.  It is called any time
 561    we are going to proceed the child, or read its registers.
 562    The hook CLEAR_DEFERRED_STORES is called when we want to throw
 563    away the inferior process, e.g. when it dies or we kill it.
 564    FIXME, this does not handle remote debugging cleanly.  */
 565
 566 extern int deferred_stores;
 567 #define DO_DEFERRED_STORES      \
 568   if (deferred_stores)          \
 569     target_store_registers (-2);
 570 #define CLEAR_DEFERRED_STORES   \
 571   deferred_stores = 0;
 572
 573 /* If the current gcc for for this target does not produce correct debugging
 574    information for float parameters, both prototyped and unprototyped, then
 575    define this macro.  This forces gdb to  always assume that floats are
 576    passed as doubles and then converted in the callee. */
 577
 578 #define COERCE_FLOAT_TO_DOUBLE 1
 579
 580 /* Select the sparc disassembler */
 581
 582 #define TM_PRINT_INSN_MACH bfd_mach_sparc
 583
 584 /* Arguments smaller than an int must promoted to ints when synthesizing
 585    function calls.  */
 586
 587 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
 588     sp = sparc_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr))
 589 extern CORE_ADDR
 590 sparc_push_arguments PARAMS ((int, struct value **, CORE_ADDR, int, CORE_ADDR));