gdb/m-sparc.h

   1 /* Parameters for execution on a Sun 4, for GDB, the GNU debugger.
   2    Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
   3    Contributed by Michael Tiemann (tiemann@mcc.com)
   4 This file is part of GDB.
   5
   6 GDB is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 1, or (at your option)
   9 any later version.
  10
  11 GDB is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GDB; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #ifndef sun4
  21 #define sun4
  22 #endif
  23
  24 /* Define the bit, byte, and word ordering of the machine.  */
  25 #define BITS_BIG_ENDIAN
  26 #define BYTES_BIG_ENDIAN
  27 #define WORDS_BIG_ENDIAN
  28
  29 /* Floating point is IEEE compatible.  */
  30 #define IEEE_FLOAT
  31
  32 /* Get rid of any system-imposed stack limit if possible.  */
  33
  34 #define SET_STACK_LIMIT_HUGE
  35
  36 /* Define this if the C compiler puts an underscore at the front
  37    of external names before giving them to the linker.  */
  38
  39 #define NAMES_HAVE_UNDERSCORE
  40
  41 /* Debugger information will be in DBX format.  */
  42
  43 #define READ_DBX_FORMAT
  44
  45 /* When passing a structure to a function, Sun cc passes the address
  46    in a register, not the structure itself.  It (under SunOS4) creates
  47    two symbols, so we get a LOC_ARG saying the address is on the stack
  48    (a lie, and a serious one since we don't know which register to
  49    use), and a LOC_REGISTER saying that the struct is in a register
  50    (sort of a lie, but fixable with REG_STRUCT_HAS_ADDR).
  51
  52    This still doesn't work if the argument is not one passed in a
  53    register (i.e. it's the 7th or later argument).  */
  54 #define REG_STRUCT_HAS_ADDR(gcc_p) (!gcc_p)
  55 #define STRUCT_ARG_SYM_GARBAGE(gcc_p) (!gcc_p)
  56
  57 /* If Pcc says that a parameter is a short, it's a short.  This is
  58    because the parameter does get passed in in a register as an int,
  59    but pcc puts it onto the stack frame as a short (not nailing
  60    whatever else might be there.  I'm not sure that I consider this
  61    swift.  Sigh.)
  62
  63    No, don't do this.  The problem here is that pcc says that the
  64    argument is in the upper half of the word reserved on the stack,
  65    but puts it in the lower half.  */
  66 /* #define BELIEVE_PCC_PROMOTION 1 */
  67 /* OK, I've added code to dbxread.c to deal with this case.  */
  68 #define BELIEVE_PCC_PROMOTION_TYPE
  69
  70 /* Offset from address of function to start of its code.
  71    Zero on most machines.  */
  72
  73 #define FUNCTION_START_OFFSET 0
  74
  75 /* Advance PC across any function entry prologue instructions
  76    to reach some "real" code.  */
  77
  78 #define SKIP_PROLOGUE(pc) \
  79   { pc = skip_prologue (pc); }
  80
  81 /* Immediately after a function call, return the saved pc.
  82    Can't go through the frames for this because on some machines
  83    the new frame is not set up until the new function executes
  84    some instructions.  */
  85
  86 /* On the Sun 4 under SunOS, the compile will leave a fake insn which
  87    encodes the structure size being returned.  If we detect such
  88    a fake insn, step past it.  */
  89
  90 #define PC_ADJUST(pc) ((read_memory_integer (pc + 8, 4) & 0xfffffe00) == 0 ? \
  91                        pc+12 : pc+8)
  92
  93 #define SAVED_PC_AFTER_CALL(frame) PC_ADJUST (read_register (RP_REGNUM))
  94
  95 /* Address of end of stack space.  */
  96 #include <sys/types.h>
  97 #include <machine/vmparam.h>
  98 #define STACK_END_ADDR USRSTACK
  99
 100 #define INNER_THAN <
 101
 102 /* Stack has strict alignment.  */
 103
 104 #define STACK_ALIGN(ADDR) (((ADDR)+7)&-8)
 105
 106 /* Sequence of bytes for breakpoint instruction.  */
 107
 108 #define BREAKPOINT {0x91, 0xd0, 0x20, 0x01}
 109
 110 /* Amount PC must be decremented by after a breakpoint.
 111    This is often the number of bytes in BREAKPOINT
 112    but not always.  */
 113
 114 #define DECR_PC_AFTER_BREAK 0
 115
 116 /* Nonzero if instruction at PC is a return instruction.  */
 117 /* For SPARC, this is either a "jmpl %o7+8,%g0" or "jmpl %i7+8,%g0".
 118
 119    Note: this does not work for functions returning structures under SunOS.  */
 120 #define ABOUT_TO_RETURN(pc) \
 121   ((read_memory_integer (pc, 4)|0x00040000) == 0x81c7e008)
 122
 123 /* Return 1 if P points to an invalid floating point value.  */
 124
 125 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
 126
 127 /* Largest integer type */
 128 #define LONGEST long
 129
 130 /* Name of the builtin type for the LONGEST type above. */
 131 #define BUILTIN_TYPE_LONGEST builtin_type_long
 132
 133 /* Say how long (ordinary) registers are.  */
 134
 135 #define REGISTER_TYPE long
 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 FP_REGNUM 30            /* Contains address of executing stack frame */
 165 #define RP_REGNUM 15            /* Contains return address value, *before* \
 166                                    any windows get switched.  */
 167 #define SP_REGNUM 14            /* Contains address of top of stack, \
 168                                    which is also the bottom of the frame.  */
 169 #define Y_REGNUM 64             /* Temp register for multiplication, etc.  */
 170 #define PS_REGNUM 65            /* Contains processor status */
 171 #define PC_REGNUM 68            /* Contains program counter */
 172 #define NPC_REGNUM 69           /* Contains next PC */
 173 #define FP0_REGNUM 32           /* Floating point register 0 */
 174 #define FPS_REGNUM 70           /* Floating point status register */
 175 #define CPS_REGNUM 71           /* Coprocessor status register */
 176
 177 /* Total amount of space needed to store our copies of the machine's
 178    register state, the array `registers'.  */
 179 #define REGISTER_BYTES (32*4+32*4+8*4)
 180
 181 /* Index within `registers' of the first byte of the space for
 182    register N.  */
 183 /* ?? */
 184 #define REGISTER_BYTE(N)  ((N)*4)
 185
 186 /* The SPARC processor has register windows.  */
 187
 188 #define HAVE_REGISTER_WINDOWS
 189
 190 /* Is this register part of the register window system?  A yes answer
 191    implies that 1) The name of this register will not be the same in
 192    other frames, and 2) This register is automatically "saved" (out
 193    registers shifting into ins counts) upon subroutine calls and thus
 194    there is no need to search more than one stack frame for it. */
 195
 196 #define REGISTER_IN_WINDOW_P(regnum)    \
 197   ((regnum) >= 8 && (regnum) < 32)
 198
 199 /* Number of bytes of storage in the actual machine representation
 200    for register N.  */
 201
 202 /* On the SPARC, all regs are 4 bytes.  */
 203
 204 #define REGISTER_RAW_SIZE(N) (4)
 205
 206 /* Number of bytes of storage in the program's representation
 207    for register N.  */
 208
 209 /* On the SPARC, all regs are 4 bytes.  */
 210
 211 #define REGISTER_VIRTUAL_SIZE(N) (4)
 212
 213 /* Largest value REGISTER_RAW_SIZE can have.  */
 214
 215 #define MAX_REGISTER_RAW_SIZE 8
 216
 217 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 218
 219 #define MAX_REGISTER_VIRTUAL_SIZE 8
 220
 221 /* Nonzero if register N requires conversion
 222    from raw format to virtual format.  */
 223
 224 #define REGISTER_CONVERTIBLE(N) (0)
 225
 226 /* Convert data from raw format for register REGNUM
 227    to virtual format for register REGNUM.  */
 228
 229 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
 230 { bcopy ((FROM), (TO), 4); }
 231
 232 /* Convert data from virtual format for register REGNUM
 233    to raw format for register REGNUM.  */
 234
 235 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 236 { bcopy ((FROM), (TO), 4); }
 237
 238 /* Return the GDB type object for the "standard" data type
 239    of data in register N.  */
 240
 241 #define REGISTER_VIRTUAL_TYPE(N) \
 242  ((N) < 32 ? builtin_type_int : (N) < 64 ? builtin_type_float : \
 243   builtin_type_int)
 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   { write_memory ((SP)+(16*4), &(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         bcopy (((int *)(REGBUF))+FP0_REGNUM,                               \
 260                (VALBUF), TYPE_LENGTH(TYPE));                               \
 261       }                                                                    \
 262     else                                                                   \
 263       bcopy (((int *)(REGBUF))+8, (VALBUF), TYPE_LENGTH (TYPE));           \
 264   }
 265
 266 /* Write into appropriate registers a function return value
 267    of type TYPE, given in virtual format.  */
 268 /* On sparc, values are returned in register %o0.  */
 269 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 270   {                                                                          \
 271     if (TYPE_CODE (TYPE) = TYPE_CODE_FLT)                                    \
 272       /* Floating-point values are returned in the register pair */          \
 273       /* formed by %f0 and %f1 (doubles are, anyway).  */                    \
 274       write_register_bytes (REGISTER_BYTE (FP0_REGNUM), (VALBUF),            \
 275                             TYPE_LENGTH (TYPE));                             \
 276     else                                                                     \
 277       /* Other values are returned in register %o0.  */                      \
 278       write_register_bytes (REGISTER_BYTE (8), VALBUF, TYPE_LENGTH (TYPE));  \
 279   }
 280
 281 /* Extract from an array REGBUF containing the (raw) register state
 282    the address in which a function should return its structure value,
 283    as a CORE_ADDR (or an expression that can be used as one).  */
 284
 285 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
 286   (read_memory_integer (((int *)(REGBUF))[SP_REGNUM]+(16*4), 4))
 287
 288 /* Enable use of alternate code to read and write registers.  */
 289
 290 #define NEW_SUN_PTRACE
 291
 292 /* Enable use of alternate code for Sun's format of core dump file.  */
 293
 294 #define NEW_SUN_CORE
 295
 296 /* Do implement the attach and detach commands.  */
 297
 298 #define ATTACH_DETACH
 299
 300 \f
 301 /* Describe the pointer in each stack frame to the previous stack frame
 302    (its caller).  */
 303 #include <machine/reg.h>
 304
 305 #define GET_RWINDOW_REG(FRAME, REG) \
 306   (read_memory_integer (&((struct rwindow *)FRAME)->REG, 4))
 307
 308 /* FRAME_CHAIN takes a frame's nominal address
 309    and produces the frame's chain-pointer.
 310
 311    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 312    and produces the nominal address of the caller frame.
 313
 314    However, if FRAME_CHAIN_VALID returns zero,
 315    it means the given frame is the outermost one and has no caller.
 316    In that case, FRAME_CHAIN_COMBINE is not used.  */
 317
 318 /* In the case of the Sun 4, the frame-chain's nominal address
 319    is held in the frame pointer register.
 320
 321    On the Sun4, the frame (in %fp) is %sp for the previous frame.
 322    From the previous frame's %sp, we can find the previous frame's
 323    %fp: it is in the save area just above the previous frame's %sp.
 324
 325    If we are setting up an arbitrary frame, we'll need to know where
 326    it ends.  Hence the following.  This part of the frame cache
 327    structure should be checked before it is assumed that this frame's
 328    bottom is in the stack pointer.
 329
 330    If there isn't a frame below this one, the bottom of this frame is
 331    in the stack pointer.
 332
 333    If there is a frame below this one, and the frame pointers are
 334    identical, it's a leaf frame and the bottoms are the same also.
 335
 336    Otherwise the bottom of this frame is the top of the next frame.  */
 337
 338 #define EXTRA_FRAME_INFO        FRAME_ADDR bottom;
 339 #define INIT_EXTRA_FRAME_INFO(fci)  \
 340   (fci)->bottom =                                       \
 341    ((fci)->next ?                                       \
 342     ((fci)->frame == (fci)->next_frame ?                \
 343      (fci)->next->bottom : (fci)->next->frame) :        \
 344     read_register (SP_REGNUM));
 345
 346 #define FRAME_CHAIN(thisframe) \
 347    GET_RWINDOW_REG ((thisframe)->frame, rw_in[6])
 348
 349 #define FRAME_CHAIN_VALID(chain, thisframe) \
 350   (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
 351
 352 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 353
 354 /* Define other aspects of the stack frame.  */
 355
 356 /* A macro that tells us whether the function invocation represented
 357    by FI does not have a frame on the stack associated with it.  If it
 358    does not, FRAMELESS is set to 1, else 0.  */
 359 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 360   FRAMELESS_LOOK_FOR_PROLOGUE(FI, FRAMELESS)
 361
 362 /* Where is the PC for a specific frame */
 363
 364 #define FRAME_SAVED_PC(FRAME) frame_saved_pc (FRAME)
 365
 366 /* If the argument is on the stack, it will be here.  */
 367 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 368
 369 #define FRAME_STRUCT_ARGS_ADDRESS(fi) ((fi)->frame)
 370
 371 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 372
 373 /* Set VAL to the number of args passed to frame described by FI.
 374    Can set VAL to -1, meaning no way to tell.  */
 375
 376 /* We can't tell how many args there are
 377    now that the C compiler delays popping them.  */
 378 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 379
 380 /* Return number of bytes at start of arglist that are not really args.  */
 381
 382 #define FRAME_ARGS_SKIP 68
 383
 384 /* Put here the code to store, into a struct frame_saved_regs,
 385    the addresses of the saved registers of frame described by FRAME_INFO.
 386    This includes special registers such as pc and fp saved in special
 387    ways in the stack frame.  sp is even more special:
 388    the address we return for it IS the sp for the next frame.
 389
 390    Note that on register window machines, we are currently making the
 391    assumption that window registers are being saved somewhere in the
 392    frame in which they are being used.  If they are stored in an
 393    inferior frame, find_saved_register will break.
 394
 395    On the Sun 4, the only time all registers are saved is when
 396    a dummy frame is involved.  Otherwise, the only saved registers
 397    are the LOCAL and IN registers which are saved as a result
 398    of the "save/restore" opcodes.  This condition is determined
 399    by address rather than by value.  */
 400
 401 #define FRAME_FIND_SAVED_REGS(fi, frame_saved_regs)         \
 402 { register int regnum;                                                  \
 403   register CORE_ADDR pc;                                                \
 404   FRAME_ADDR frame = read_register (FP_REGNUM);                         \
 405   FRAME fid = FRAME_INFO_ID (fi);                                       \
 406   if (!fid) fatal ("Bad frame info struct in FRAME_FIND_SAVED_REGS");   \
 407   bzero (&(frame_saved_regs), sizeof (frame_saved_regs));               \
 408   /* Old test.                                                          \
 409   if ((fi)->pc >= frame - CALL_DUMMY_LENGTH - 0x140                     \
 410       && (fi)->pc <= frame) */                                          \
 411   if ((fi)->pc >= ((fi)->bottom ? (fi)->bottom :                        \
 412                    read_register (SP_REGNUM))                           \
 413       && (fi)->pc <= FRAME_FP(fi))                                      \
 414     {                                                                   \
 415       for (regnum = 1; regnum < 8; regnum++)                            \
 416         (frame_saved_regs).regs[regnum] =                               \
 417           frame + regnum * 4 - 0xa0;                                    \
 418       for (regnum = 24; regnum < 32; regnum++)                          \
 419         (frame_saved_regs).regs[regnum] =                               \
 420           frame + (regnum - 24) * 4 - 0xc0;                             \
 421       for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 32; regnum++)     \
 422         (frame_saved_regs).regs[regnum] =                               \
 423           frame + (regnum - FP0_REGNUM) * 4 - 0x80;                     \
 424       for (regnum = 64; regnum < NUM_REGS; regnum++)                    \
 425         (frame_saved_regs).regs[regnum] =                               \
 426           frame + (regnum - 64) * 4 - 0xe0;                             \
 427       frame = (fi)->bottom ?                                            \
 428         (fi)->bottom : read_register (SP_REGNUM);                       \
 429     }                                                                   \
 430   else                                                                  \
 431     {                                                                   \
 432       frame = (fi)->bottom ?                                            \
 433         (fi)->bottom : read_register (SP_REGNUM);                       \
 434       for (regnum = 16; regnum < 32; regnum++)                          \
 435         (frame_saved_regs).regs[regnum] = frame + (regnum-16) * 4;      \
 436     }                                                                   \
 437   if ((fi)->next)                                                       \
 438     {                                                                   \
 439       /* Pull off either the next frame pointer or                      \
 440          the stack pointer */                                           \
 441       FRAME_ADDR next_next_frame =                                      \
 442         ((fi)->next->bottom ?                                           \
 443          (fi)->next->bottom :                                           \
 444          read_register (SP_REGNUM));                                    \
 445       for (regnum = 8; regnum < 16; regnum++)                           \
 446         (frame_saved_regs).regs[regnum] = next_next_frame + regnum * 4; \
 447     }                                                                   \
 448   /* Otherwise, whatever we would get from ptrace(GETREGS) */           \
 449   /* is accurate */                                                     \
 450   for (regnum = 30; regnum < 32; regnum++)                              \
 451     (frame_saved_regs).regs[regnum] = frame + (regnum-16) * 4;          \
 452   (frame_saved_regs).regs[SP_REGNUM] = FRAME_FP (fi);                   \
 453   (frame_saved_regs).regs[PC_REGNUM] = frame + 15*4;                    \
 454 }
 455 \f
 456 /* Things needed for making the inferior call functions.  */
 457 /*
 458  * First of all, let me give my opinion of what the DUMMY_FRAME
 459  * actually looks like.
 460  *
 461  *               |                                 |
 462  *               |                                 |
 463  *               + - - - - - - - - - - - - - - - - +<-- fp (level 0)
 464  *               |                                 |
 465  *               |                                 |
 466  *               |                                 |
 467  *               |                                 |
 468  *               |  Frame of innermost program     |
 469  *               |           function              |
 470  *               |                                 |
 471  *               |                                 |
 472  *               |                                 |
 473  *               |                                 |
 474  *               |                                 |
 475  *               |---------------------------------|<-- sp (level 0), fp (c)
 476  *               |                                 |
 477  *     DUMMY     |             fp0-31              |
 478  *               |                                 |
 479  *               |             ------              |<-- fp - 0x80
 480  *     FRAME     |              g0-7               |<-- fp - 0xa0
 481  *               |              i0-7               |<-- fp - 0xc0
 482  *               |             other               |<-- fp - 0xe0
 483  *               |               ?                 |
 484  *               |               ?                 |
 485  *               |---------------------------------|<-- sp' = fp - 0x140
 486  *               |                                 |
 487  * xcution start |                                 |
 488  * sp' + 0x94 -->|        CALL_DUMMY (x code)      |
 489  *               |                                 |
 490  *               |                                 |
 491  *               |---------------------------------|<-- sp'' = fp - 0x200
 492  *               |  align sp to 8 byte boundary    |
 493  *               |     ==> args to fn <==          |
 494  *  Room for     |                                 |
 495  * i & l's + agg | CALL_DUMMY_STACK_ADJUST = 0x0x44|
 496  *               |---------------------------------|<-- final sp (variable)
 497  *               |                                 |
 498  *               |   Where function called will    |
 499  *               |           build frame.          |
 500  *               |                                 |
 501  *               |                                 |
 502  *
 503  *   I understand everything in this picture except what the space
 504  * between fp - 0xe0 and fp - 0x140 is used for.  Oh, and I don't
 505  * understand why there's a large chunk of CALL_DUMMY that never gets
 506  * executed (its function is superceeded by PUSH_DUMMY_FRAME; they
 507  * are designed to do the same thing).
 508  *
 509  *   PUSH_DUMMY_FRAME saves the registers above sp' and pushes the
 510  * register file stack down one.
 511  *
 512  *   call_function then writes CALL_DUMMY, pushes the args onto the
 513  * stack, and adjusts the stack pointer.
 514  *
 515  *   run_stack_dummy then starts execution (in the middle of
 516  * CALL_DUMMY, as directed by call_function).
 517  */
 518
 519 /* Push an empty stack frame, to record the current PC, etc.  */
 520
 521 /* Note: to be perfectly correct, we have to restore the
 522    IN registers (which were the OUT registers of the calling frame).  */
 523 /* Note that the write's are of registers in the context of the newly
 524    pushed frame.  Thus the the fp*'s, the g*'s, the i*'s, and
 525    the others, of the new frame, are being saved.
 526    The locals are new; they don't need to be saved. The i's and l's of
 527    the last frame were saved by the do_save_insn in the register
 528    file (ie. on the stack, since a context switch happended imm after)  */
 529 /* We note that the return pointer register does not *need* to have
 530    the pc saved into it (return from this frame will be accomplished
 531    by a POP_FRAME), however, just in case it might be needed, we will
 532    leave it.  However, we will write the original value of RP into the
 533    location on the stack for saving i7 (what rp turns into upon call);
 534    this way we don't loose the value with our function call. */
 535 /* Note that the pc saved must be 8 less than the actual pc, since
 536    both POP_FRAME and the normal return sequence on the sparc return
 537    to 8 more than the value of RP_REGNUM */
 538
 539 #define PUSH_DUMMY_FRAME \
 540 { extern char registers[];                                              \
 541   register int regnum;                                                  \
 542   CORE_ADDR fp = read_register (FP_REGNUM);                             \
 543   CORE_ADDR pc = read_register (PC_REGNUM) - 8;                         \
 544   CORE_ADDR rp = read_register (RP_REGNUM);                             \
 545   void do_save_insn ();                                                 \
 546   supply_register (RP_REGNUM, &pc);                                     \
 547   do_save_insn (0x140);                                                 \
 548   fp = read_register (FP_REGNUM);                                       \
 549   write_memory (fp - 0x80, &registers[REGISTER_BYTE (FP0_REGNUM)], 32 * 4);\
 550   write_memory (fp - 0xa0, &registers[REGISTER_BYTE (0)], 8 * 4);       \
 551   write_memory (fp - 0xc0, &registers[REGISTER_BYTE (24)], 7 * 4);      \
 552   write_memory (fp - 0xa4, &rp, 4);                                     \
 553   write_memory (fp - 0xe0, &registers[REGISTER_BYTE (64)], 8 * 4);      \
 554 }
 555
 556 /* Discard from the stack the innermost frame,
 557    restoring all saved registers.
 558    Note that the values stored in fsr by get_frame_saved_regs are *in
 559    the context of the inferior frame*.  What this means is that the i
 560    regs of fsr must be restored into the o regs of the frame popped
 561    into.  We don't care about the output regs of the inferior frame.
 562
 563    This is true for dummy frames.  Is it true for normal frames?  It
 564    really does appear so. */
 565
 566 #define POP_FRAME  \
 567 { register FRAME frame = get_current_frame ();                          \
 568   register CORE_ADDR fp;                                                \
 569   register CORE_ADDR pc;                                                \
 570   register int regnum;                                                  \
 571   struct frame_saved_regs fsr;                                          \
 572   struct frame_info *fi;                                                \
 573   char raw_buffer[REGISTER_BYTES];                                      \
 574   void do_restore_insn ();                                              \
 575   fi = get_frame_info (frame);                                          \
 576   fp = fi->frame;                                                       \
 577   get_frame_saved_regs (fi, &fsr);                                      \
 578   pc = read_memory_integer (fsr.regs[PC_REGNUM], 4);                    \
 579   do_restore_insn (PC_ADJUST (pc));                                     \
 580   if (fsr.regs[FP0_REGNUM])                                             \
 581     {                                                                   \
 582       read_memory (fsr.regs[FP0_REGNUM], raw_buffer, 32 * 4);           \
 583       write_register_bytes (REGISTER_BYTE (FP0_REGNUM), raw_buffer, 32 * 4); \
 584     }                                                                   \
 585   if (fsr.regs[1])                                                      \
 586     {                                                                   \
 587       read_memory (fsr.regs[1], raw_buffer, 7 * 4);                     \
 588       write_register_bytes (REGISTER_BYTE (1), raw_buffer, 7 * 4);      \
 589     }                                                                   \
 590   if (fsr.regs[24])                                                     \
 591     {                                                                   \
 592       read_memory (fsr.regs[24], raw_buffer, 8 * 4);                    \
 593       write_register_bytes (REGISTER_BYTE (8), raw_buffer, 8 * 4);      \
 594     }                                                                   \
 595   if (fsr.regs[PS_REGNUM])                                              \
 596     write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \
 597   if (fsr.regs[Y_REGNUM])                                               \
 598     write_register (Y_REGNUM, read_memory_integer (fsr.regs[Y_REGNUM], 4)); \
 599   if (fsr.regs[NPC_REGNUM])                                             \
 600     write_register (NPC_REGNUM, read_memory_integer (fsr.regs[NPC_REGNUM], 4)); \
 601   flush_cached_frames ();                                               \
 602   set_current_frame ( create_new_frame (read_register (FP_REGNUM),      \
 603                                         read_pc ())); }
 604
 605 /* This sequence of words is the instructions
 606
 607    save %sp,-0x140,%sp
 608    std  %f30,[%fp-0x08]
 609    std  %f28,[%fp-0x10]
 610    std  %f26,[%fp-0x18]
 611    std  %f24,[%fp-0x20]
 612    std  %f22,[%fp-0x28]
 613    std  %f20,[%fp-0x30]
 614    std  %f18,[%fp-0x38]
 615    std  %f16,[%fp-0x40]
 616    std  %f14,[%fp-0x48]
 617    std  %f12,[%fp-0x50]
 618    std  %f10,[%fp-0x58]
 619    std  %f8,[%fp-0x60]
 620    std  %f6,[%fp-0x68]
 621    std  %f4,[%fp-0x70]
 622    std  %f2,[%fp-0x78]
 623    std  %f0,[%fp-0x80]
 624    std  %g6,[%fp-0x88]
 625    std  %g4,[%fp-0x90]
 626    std  %g2,[%fp-0x98]
 627    std  %g0,[%fp-0xa0]
 628    std  %i6,[%fp-0xa8]
 629    std  %i4,[%fp-0xb0]
 630    std  %i2,[%fp-0xb8]
 631    std  %i0,[%fp-0xc0]
 632    nop ! stcsr  [%fp-0xc4]
 633    nop ! stfsr  [%fp-0xc8]
 634    nop ! wr     %npc,[%fp-0xcc]
 635    nop ! wr     %pc,[%fp-0xd0]
 636    rd   %tbr,%o0
 637    st   %o0,[%fp-0xd4]
 638    rd   %wim,%o1
 639    st   %o0,[%fp-0xd8]
 640    rd   %psr,%o0
 641    st   %o0,[%fp-0xdc]
 642    rd   %y,%o0
 643    st   %o0,[%fp-0xe0]
 644
 645      /..* The arguments are pushed at this point by GDB;
 646         no code is needed in the dummy for this.
 647         The CALL_DUMMY_START_OFFSET gives the position of
 648         the following ld instruction.  *../
 649
 650    ld   [%sp+0x58],%o5
 651    ld   [%sp+0x54],%o4
 652    ld   [%sp+0x50],%o3
 653    ld   [%sp+0x4c],%o2
 654    ld   [%sp+0x48],%o1
 655    call 0x00000000
 656    ld   [%sp+0x44],%o0
 657    nop
 658    ta 1
 659    nop
 660
 661    note that this is 192 bytes, which is a multiple of 8 (not only 4) bytes.
 662    note that the `call' insn is a relative, not an absolute call.
 663    note that the `nop' at the end is needed to keep the trap from
 664         clobbering things (if NPC pointed to garbage instead).
 665
 666 We actually start executing at the `sethi', since the pushing of the
 667 registers (as arguments) is done by PUSH_DUMMY_FRAME.  If this were
 668 real code, the arguments for the function called by the CALL would be
 669 pushed between the list of ST insns and the CALL, and we could allow
 670 it to execute through.  But the arguments have to be pushed by GDB
 671 after the PUSH_DUMMY_FRAME is done, and we cannot allow these ST
 672 insns to be performed again, lest the registers saved be taken for
 673 arguments.  */
 674
 675 #define CALL_DUMMY { 0x9de3bee0, 0xfd3fbff8, 0xf93fbff0, 0xf53fbfe8,    \
 676                      0xf13fbfe0, 0xed3fbfd8, 0xe93fbfd0, 0xe53fbfc8,    \
 677                      0xe13fbfc0, 0xdd3fbfb8, 0xd93fbfb0, 0xd53fbfa8,    \
 678                      0xd13fbfa0, 0xcd3fbf98, 0xc93fbf90, 0xc53fbf88,    \
 679                      0xc13fbf80, 0xcc3fbf78, 0xc83fbf70, 0xc43fbf68,    \
 680                      0xc03fbf60, 0xfc3fbf58, 0xf83fbf50, 0xf43fbf48,    \
 681                      0xf03fbf40, 0x01000000, 0x01000000, 0x01000000,    \
 682                      0x01000000, 0x91580000, 0xd027bf50, 0x93500000,    \
 683                      0xd027bf4c, 0x91480000, 0xd027bf48, 0x91400000,    \
 684                      0xd027bf44, 0xda03a058, 0xd803a054, 0xd603a050,    \
 685                      0xd403a04c, 0xd203a048, 0x40000000, 0xd003a044,    \
 686                      0x01000000, 0x91d02001, 0x01000000, 0x01000000}
 687
 688 #define CALL_DUMMY_LENGTH 192
 689
 690 #define CALL_DUMMY_START_OFFSET 148
 691
 692 #define CALL_DUMMY_STACK_ADJUST 68
 693
 694 /* Insert the specified number of args and function address
 695    into a call sequence of the above form stored at DUMMYNAME.  */
 696
 697 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, type)     \
 698 {                                                                       \
 699   *(int *)((char *) dummyname+168) = (0x40000000|((fun-(pc+168))>>2));  \
 700   if (TYPE_CODE (type) == TYPE_CODE_STRUCT                              \
 701       || TYPE_CODE (type) == TYPE_CODE_UNION)                           \
 702     *(int *)((char *) dummyname+176) = (TYPE_LENGTH (type) & 0x1fff);   \
 703 }
 704
 705 \f
 706 /* Sparc has no reliable single step ptrace call */
 707
 708 #define NO_SINGLE_STEP 1
 709
 710 /* It does have a wait structure, and it might help things out . . . */
 711
 712 #define HAVE_WAIT_STRUCT
 713
 714 /* Handle a feature in the sun4 compiler ("call .stret4" at the end of
 715    functions returning structures).  */
 716
 717 #define SUN4_COMPILER_FEATURE
 718
 719 /* We need two arguments (in general) to the "info frame" command.
 720    Note that the definition of this macro implies that there exists a
 721    function "setup_arbitrary_frame" in mach-dep.c */
 722
 723 #define FRAME_SPECIFICATION_DYADIC
 724
 725 /* KDB stuff flushed for now.  */