gdb/tm-68k.h

   1 /* Parameters for execution on a 68000 series machine.
   2    Copyright (C) 1986, 1987, 1989, 1990 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program 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 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program 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 this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* Generic 68000 stuff, to be included by other tm-*.h files.
  21    Define HAVE_68881 if that is the case.  */
  22
  23 #if defined (HAVE_68881)
  24 #define IEEE_FLOAT 1
  25 #endif
  26
  27 /* Define the bit, byte, and word ordering of the machine.  */
  28 #define TARGET_BYTE_ORDER BIG_ENDIAN
  29
  30 /* Offset from address of function to start of its code.
  31    Zero on most machines.  */
  32
  33 #define FUNCTION_START_OFFSET 0
  34
  35 /* Advance PC across any function entry prologue instructions
  36    to reach some "real" code.  */
  37
  38 #define SKIP_PROLOGUE(pc)   \
  39 { register int op = read_memory_integer (pc, 2);        \
  40   if (op == 0047126)                                    \
  41     pc += 4;   /* Skip link #word */                    \
  42   else if (op == 0044016)                               \
  43     pc += 6;   /* Skip link #long */                    \
  44   /* Not sure why branches are here.  */                \
  45   /* From m-isi.h, m-altos.h */                         \
  46   else if (op == 0060000)                               \
  47     pc += 4;   /* Skip bra #word */                     \
  48   else if (op == 00600377)                              \
  49     pc += 6;   /* skip bra #long */                     \
  50   else if ((op & 0177400) == 0060000)                   \
  51     pc += 2;   /* skip bra #char */                     \
  52 }
  53
  54 /* Immediately after a function call, return the saved pc.
  55    Can't always go through the frames for this because on some machines
  56    the new frame is not set up until the new function executes
  57    some instructions.  */
  58
  59 #define SAVED_PC_AFTER_CALL(frame) \
  60 read_memory_integer (read_register (SP_REGNUM), 4)
  61
  62 /* Stack grows downward.  */
  63
  64 #define INNER_THAN <
  65
  66 /* Sequence of bytes for breakpoint instruction.
  67    This is a TRAP instruction.  The last 4 bits (0xf below) is the
  68    vector.  Systems which don't use 0xf should define BPT_VECTOR
  69    themselves before including this file.  */
  70
  71 #if !defined BPT_VECTOR
  72 #define BPT_VECTOR 0xf
  73 #endif
  74
  75 #if !defined (BREAKPOINT)
  76 #define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)}
  77 #endif
  78
  79 /* If your kernel resets the pc after the trap happens you may need to
  80    define this before including this file.  */
  81
  82 #if !defined (DECR_PC_AFTER_BREAK)
  83 #define DECR_PC_AFTER_BREAK 2
  84 #endif
  85
  86 /* Nonzero if instruction at PC is a return instruction.  */
  87 /* Allow any of the return instructions, including a trapv and a return
  88    from interupt.  */
  89
  90 #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 2) & ~0x3) == 0x4e74)
  91
  92 /* Return 1 if P points to an invalid floating point value.  */
  93
  94 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
  95
  96 /* Say how long registers are.  */
  97
  98 #define REGISTER_TYPE long
  99
 100 #if defined (HAVE_68881)
 101 #  if defined (GDB_TARGET_IS_SUN3)
 102     /* Sun3 status includes fpflags, which shows whether the FPU has been used
 103        by the process, and whether the FPU was done with an instruction or
 104        was interrupted in the middle of a long instruction.  See
 105        <machine/reg.h>.  */
 106     /*                      a&d, pc,sr, fp, fpstat, fpflags   */
 107 #    define NUM_REGS 31
 108 #    define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4 + 4)
 109 #  else /* Not sun3.  */
 110 #    define NUM_REGS 29
 111 #    define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4)
 112 #  endif /* Not sun3.  */
 113 #else /* No 68881.  */
 114 #  define NUM_REGS 18
 115 #  define REGISTER_BYTES (16*4 + 8)
 116 #endif /* No 68881.  */
 117
 118 /* Index within `registers' of the first byte of the space for
 119    register N.  */
 120
 121 #if defined (HAVE_68881)
 122 #define REGISTER_BYTE(N)  \
 123  ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168    \
 124   : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72  \
 125   : (N) * 4)
 126
 127 /* Number of bytes of storage in the actual machine representation
 128    for register N.  On the 68000, all regs are 4 bytes
 129    except the floating point regs which are 12 bytes.  */
 130 /* Note that the unsigned cast here forces the result of the
 131    subtraction to very high positive values if N < FP0_REGNUM */
 132
 133 #define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4)
 134
 135 /* Number of bytes of storage in the program's representation
 136    for register N.  On the 68000, all regs are 4 bytes
 137    except the floating point regs which are 8-byte doubles.  */
 138
 139 #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4)
 140
 141 /* Largest value REGISTER_RAW_SIZE can have.  */
 142
 143 #define MAX_REGISTER_RAW_SIZE 12
 144
 145 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 146
 147 #define MAX_REGISTER_VIRTUAL_SIZE 8
 148
 149 /* Nonzero if register N requires conversion
 150    from raw format to virtual format.  */
 151
 152 #define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8)
 153
 154 /* Put the declaration out here because if it's in the macros, PCC
 155    will complain.  */
 156 extern struct ext_format ext_format_68881;
 157
 158 /* Convert data from raw format for register REGNUM
 159    to virtual format for register REGNUM.  */
 160
 161 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 162 { \
 163   if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 164     ieee_extended_to_double (&ext_format_68881, (FROM), (double *)(TO)); \
 165   else                                  \
 166     bcopy ((FROM), (TO), 4);    \
 167 }
 168
 169 /* Convert data from virtual format for register REGNUM
 170    to raw format for register REGNUM.  */
 171
 172 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 173 { \
 174   if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 175     double_to_ieee_extended (&ext_format_68881, (double *)(FROM), (TO)); \
 176   else                                  \
 177     bcopy ((FROM), (TO), 4);    \
 178 }
 179
 180 /* Return the GDB type object for the "standard" data type
 181    of data in register N.  */
 182 /* Note, for registers which contain addresses return
 183    pointer to void, not pointer to char, because we don't
 184    want to attempt to print the string after printing the address.  */
 185 #define REGISTER_VIRTUAL_TYPE(N) \
 186  (((unsigned)(N) - FP0_REGNUM) < 8 ? builtin_type_double :           \
 187   (N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM ?         \
 188   lookup_pointer_type (builtin_type_void) : builtin_type_int)
 189
 190 #else /* no 68881.  */
 191 /* Index within `registers' of the first byte of the space for
 192    register N.  */
 193
 194 #define REGISTER_BYTE(N)  ((N) * 4)
 195
 196 /* Number of bytes of storage in the actual machine representation
 197    for register N.  On the 68000, all regs are 4 bytes.  */
 198
 199 #define REGISTER_RAW_SIZE(N) 4
 200
 201 /* Number of bytes of storage in the program's representation
 202    for register N.  On the 68000, all regs are 4 bytes.  */
 203
 204 #define REGISTER_VIRTUAL_SIZE(N) 4
 205
 206 /* Largest value REGISTER_RAW_SIZE can have.  */
 207
 208 #define MAX_REGISTER_RAW_SIZE 4
 209
 210 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 211
 212 #define MAX_REGISTER_VIRTUAL_SIZE 4
 213
 214 /* Nonzero if register N requires conversion
 215    from raw format to virtual format.  */
 216
 217 #define REGISTER_CONVERTIBLE(N) 0
 218
 219 /* Convert data from raw format for register REGNUM
 220    to virtual format for register REGNUM.  */
 221
 222 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)  bcopy ((FROM), (TO), 4);
 223
 224 /* Convert data from virtual format for register REGNUM
 225    to raw format for register REGNUM.  */
 226
 227 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)  bcopy ((FROM), (TO), 4);
 228
 229 /* Return the GDB type object for the "standard" data type
 230    of data in register N.  */
 231
 232 #define REGISTER_VIRTUAL_TYPE(N)  builtin_type_int
 233
 234 #endif /* No 68881.  */
 235
 236 /* Initializer for an array of names of registers.
 237    Entries beyond the first NUM_REGS are ignored.  */
 238
 239 #define REGISTER_NAMES  \
 240  {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \
 241   "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \
 242   "ps", "pc",  \
 243   "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \
 244   "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" }
 245
 246 /* Register numbers of various important registers.
 247    Note that some of these values are "real" register numbers,
 248    and correspond to the general registers of the machine,
 249    and some are "phony" register numbers which are too large
 250    to be actual register numbers as far as the user is concerned
 251    but do serve to get the desired values when passed to read_register.  */
 252
 253 #define A1_REGNUM 9
 254 #define FP_REGNUM 14            /* Contains address of executing stack frame */
 255 #define SP_REGNUM 15            /* Contains address of top of stack */
 256 #define PS_REGNUM 16            /* Contains processor status */
 257 #define PC_REGNUM 17            /* Contains program counter */
 258 #if defined (HAVE_68881)
 259 #define FP0_REGNUM 18           /* Floating point register 0 */
 260 #define FPC_REGNUM 26           /* 68881 control register */
 261 #define FPS_REGNUM 27           /* 68881 status register */
 262 #define FPI_REGNUM 28           /* 68881 iaddr register */
 263 #endif /* 68881.  */
 264
 265 /* Store the address of the place in which to copy the structure the
 266    subroutine will return.  This is called from call_function. */
 267
 268 #define STORE_STRUCT_RETURN(ADDR, SP) \
 269   { write_register (A1_REGNUM, (ADDR)); }
 270
 271 /* Extract from an array REGBUF containing the (raw) register state
 272    a function return value of type TYPE, and copy that, in virtual format,
 273    into VALBUF.  This is assuming that floating point values are returned
 274    as doubles in d0/d1.  */
 275
 276 #if !defined (EXTRACT_RETURN_VALUE)
 277 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 278   bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
 279 #endif
 280
 281 /* Write into appropriate registers a function return value
 282    of type TYPE, given in virtual format.  Assumes floats are passed
 283    in d0/d1.  */
 284
 285 #if !defined (STORE_RETURN_VALUE)
 286 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 287   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 288 #endif
 289
 290 /* Extract from an array REGBUF containing the (raw) register state
 291    the address in which a function should return its structure value,
 292    as a CORE_ADDR (or an expression that can be used as one).  */
 293
 294 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 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    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 303    and produces the nominal address of the caller frame.
 304
 305    However, if FRAME_CHAIN_VALID returns zero,
 306    it means the given frame is the outermost one and has no caller.
 307    In that case, FRAME_CHAIN_COMBINE is not used.  */
 308
 309 /* In the case of the 68000, the frame's nominal address
 310    is the address of a 4-byte word containing the calling frame's address.  */
 311
 312 #define FRAME_CHAIN(thisframe)  \
 313   (outside_startup_file ((thisframe)->pc) ? \
 314    read_memory_integer ((thisframe)->frame, 4) :\
 315    0)
 316
 317 #if defined (FRAME_CHAIN_VALID_ALTERNATE)
 318
 319 /* Use the alternate method of avoiding running up off the end of
 320    the frame chain or following frames back into the startup code.
 321    See the comments in blockframe.c */
 322
 323 #define FRAME_CHAIN_VALID(chain, thisframe)     \
 324   (chain != 0                                   \
 325    && !(inside_main_scope ((thisframe)->pc))    \
 326    && !(inside_entry_scope ((thisframe)->pc)))
 327
 328 #else
 329
 330 #define FRAME_CHAIN_VALID(chain, thisframe) \
 331   (chain != 0 && outside_startup_file (FRAME_SAVED_PC (thisframe)))
 332
 333 #endif  /* FRAME_CHAIN_VALID_ALTERNATE */
 334
 335 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 336
 337 /* Define other aspects of the stack frame.  */
 338
 339 /* A macro that tells us whether the function invocation represented
 340    by FI does not have a frame on the stack associated with it.  If it
 341    does not, FRAMELESS is set to 1, else 0.  */
 342 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 343   (FRAMELESS) = frameless_look_for_prologue(FI)
 344
 345 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 346
 347 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 348
 349 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 350
 351 /* Set VAL to the number of args passed to frame described by FI.
 352    Can set VAL to -1, meaning no way to tell.  */
 353
 354 /* We can't tell how many args there are
 355    now that the C compiler delays popping them.  */
 356 #if !defined (FRAME_NUM_ARGS)
 357 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 358 #endif
 359
 360 /* Return number of bytes at start of arglist that are not really args.  */
 361
 362 #define FRAME_ARGS_SKIP 8
 363
 364 /* Put here the code to store, into a struct frame_saved_regs,
 365    the addresses of the saved registers of frame described by FRAME_INFO.
 366    This includes special registers such as pc and fp saved in special
 367    ways in the stack frame.  sp is even more special:
 368    the address we return for it IS the sp for the next frame.  */
 369
 370 #if !defined (FRAME_FIND_SAVED_REGS)
 371 #if defined (HAVE_68881)
 372 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)             \
 373 { register int regnum;                                                  \
 374   register int regmask;                                                 \
 375   register CORE_ADDR next_addr;                                         \
 376   register CORE_ADDR pc;                                                \
 377   int nextinsn;                                                         \
 378   bzero (&frame_saved_regs, sizeof frame_saved_regs);                   \
 379   if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \
 380       && (frame_info)->pc <= (frame_info)->frame)                               \
 381     { next_addr = (frame_info)->frame;                                  \
 382       pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\
 383   else                                                                  \
 384     { pc = get_pc_function_start ((frame_info)->pc);                    \
 385       /* Verify we have a link a6 instruction next;                     \
 386          if not we lose.  If we win, find the address above the saved   \
 387          regs using the amount of storage from the link instruction.  */\
 388       if (044016 == read_memory_integer (pc, 2))                        \
 389         next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 4), pc+=4; \
 390       else if (047126 == read_memory_integer (pc, 2))                   \
 391         next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 2), pc+=2; \
 392       else goto lose;                                                   \
 393       /* If have an addal #-n, sp next, adjust next_addr.  */           \
 394       if ((0177777 & read_memory_integer (pc, 2)) == 0157774)           \
 395         next_addr += read_memory_integer (pc += 2, 4), pc += 4;         \
 396     }                                                                   \
 397   /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */      \
 398   regmask = read_memory_integer (pc + 2, 2);                            \
 399   /* But before that can come an fmovem.  Check for it.  */             \
 400   nextinsn = 0xffff & read_memory_integer (pc, 2);                      \
 401   if (0xf227 == nextinsn                                                \
 402       && (regmask & 0xff00) == 0xe000)                                  \
 403     { pc += 4; /* Regmask's low bit is for register fp7, the first pushed */ \
 404       for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1)              \
 405         if (regmask & 1)                                                \
 406           (frame_saved_regs).regs[regnum] = (next_addr -= 12);          \
 407       regmask = read_memory_integer (pc + 2, 2); }                      \
 408   if (0044327 == read_memory_integer (pc, 2))                           \
 409     { pc += 4; /* Regmask's low bit is for register 0, the first written */ \
 410       for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)            \
 411         if (regmask & 1)                                                \
 412           (frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; }     \
 413   else if (0044347 == read_memory_integer (pc, 2))                      \
 414     { pc += 4; /* Regmask's low bit is for register 15, the first pushed */ \
 415       for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1)           \
 416         if (regmask & 1)                                                \
 417           (frame_saved_regs).regs[regnum] = (next_addr -= 4); }         \
 418   else if (0x2f00 == (0xfff0 & read_memory_integer (pc, 2)))            \
 419     { regnum = 0xf & read_memory_integer (pc, 2); pc += 2;              \
 420       (frame_saved_regs).regs[regnum] = (next_addr -= 4); }             \
 421   /* fmovemx to index of sp may follow.  */                             \
 422   regmask = read_memory_integer (pc + 2, 2);                            \
 423   nextinsn = 0xffff & read_memory_integer (pc, 2);                      \
 424   if (0xf236 == nextinsn                                                \
 425       && (regmask & 0xff00) == 0xf000)                                  \
 426     { pc += 10; /* Regmask's low bit is for register fp0, the first written */ \
 427       for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1)              \
 428         if (regmask & 1)                                                \
 429           (frame_saved_regs).regs[regnum] = (next_addr += 12) - 12;     \
 430       regmask = read_memory_integer (pc + 2, 2); }                      \
 431   /* clrw -(sp); movw ccr,-(sp) may follow.  */                         \
 432   if (0x426742e7 == read_memory_integer (pc, 4))                        \
 433     (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4);              \
 434   lose: ;                                                               \
 435   (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8;         \
 436   (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;             \
 437   (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;         \
 438 }
 439 #else /* no 68881.  */
 440 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)             \
 441 { register int regnum;                                                  \
 442   register int regmask;                                                 \
 443   register CORE_ADDR next_addr;                                         \
 444   register CORE_ADDR pc;                                                \
 445   bzero (&frame_saved_regs, sizeof frame_saved_regs);                   \
 446   if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 4 \
 447       && (frame_info)->pc <= (frame_info)->frame)                               \
 448     { next_addr = (frame_info)->frame;                                  \
 449       pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4; }\
 450   else                                                                  \
 451     { pc = get_pc_function_start ((frame_info)->pc);                    \
 452       /* Verify we have a link a6 instruction next;                     \
 453          if not we lose.  If we win, find the address above the saved   \
 454          regs using the amount of storage from the link instruction.  */\
 455       if (044016 == read_memory_integer (pc, 2))                        \
 456         next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 4), pc+=4; \
 457       else if (047126 == read_memory_integer (pc, 2))                   \
 458         next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 2), pc+=2; \
 459       else goto lose;                                                   \
 460       /* If have an addal #-n, sp next, adjust next_addr.  */           \
 461       if ((0177777 & read_memory_integer (pc, 2)) == 0157774)           \
 462         next_addr += read_memory_integer (pc += 2, 4), pc += 4;         \
 463     }                                                                   \
 464   /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */      \
 465   regmask = read_memory_integer (pc + 2, 2);                            \
 466   if (0044327 == read_memory_integer (pc, 2))                           \
 467     { pc += 4; /* Regmask's low bit is for register 0, the first written */ \
 468       for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)            \
 469         if (regmask & 1)                                                \
 470           (frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; }     \
 471   else if (0044347 == read_memory_integer (pc, 2))                      \
 472     { pc += 4; /* Regmask's low bit is for register 15, the first pushed */ \
 473       for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1)           \
 474         if (regmask & 1)                                                \
 475           (frame_saved_regs).regs[regnum] = (next_addr -= 4); }         \
 476   else if (0x2f00 == 0xfff0 & read_memory_integer (pc, 2))              \
 477     { regnum = 0xf & read_memory_integer (pc, 2); pc += 2;              \
 478       (frame_saved_regs).regs[regnum] = (next_addr -= 4); }             \
 479   /* clrw -(sp); movw ccr,-(sp) may follow.  */                         \
 480   if (0x426742e7 == read_memory_integer (pc, 4))                        \
 481     (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4);              \
 482   lose: ;                                                               \
 483   (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8;         \
 484   (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;             \
 485   (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;         \
 486 }
 487 #endif /* no 68881.  */
 488 #endif /* no FIND_FRAME_SAVED_REGS.  */
 489
 490 \f
 491 /* Things needed for making the inferior call functions.
 492    It seems like every m68k based machine has almost identical definitions
 493    in the individual machine's configuration files.  Most other cpu types
 494    (mips, i386, etc) have routines in their *-tdep.c files to handle this
 495    for most configurations.  The m68k family should be able to do this as
 496    well.  These macros can still be overridden when necessary.  */
 497
 498 /* The CALL_DUMMY macro is the sequence of instructions, as disassembled
 499    by gdb itself:
 500
 501         fmovemx fp0-fp7,sp@-                    0xf227 0xe0ff
 502         moveml d0-a5,sp@-                       0x48e7 0xfffc
 503         clrw sp@-                               0x4267
 504         movew ccr,sp@-                          0x42e7
 505
 506         /..* The arguments are pushed at this point by GDB;
 507         no code is needed in the dummy for this.
 508         The CALL_DUMMY_START_OFFSET gives the position of
 509         the following jsr instruction.  *../
 510
 511         jsr @#0x32323232                        0x4eb9 0x3232 0x3232
 512         addal #0x69696969,sp                    0xdffc 0x6969 0x6969
 513         trap #<your BPT_VECTOR number here>     0x4e4?
 514         nop                                     0x4e71
 515
 516    Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
 517    We actually start executing at the jsr, since the pushing of the
 518    registers is done by PUSH_DUMMY_FRAME.  If this were real code,
 519    the arguments for the function called by the jsr would be pushed
 520    between the moveml and the jsr, and we could allow it to execute through.
 521    But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
 522    done, and we cannot allow the moveml to push the registers again lest
 523    they be taken for the arguments.  */
 524
 525 #if defined (HAVE_68881)
 526
 527 #define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))}
 528 #define CALL_DUMMY_LENGTH 28            /* Size of CALL_DUMMY */
 529 #define CALL_DUMMY_START_OFFSET 12      /* Offset to jsr instruction*/
 530
 531 #else
 532
 533 #define CALL_DUMMY {0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))}
 534 #define CALL_DUMMY_LENGTH 24            /* Size of CALL_DUMMY */
 535 #define CALL_DUMMY_START_OFFSET 8       /* Offset to jsr instruction*/
 536
 537 #endif  /* HAVE_68881 */
 538
 539 /* Insert the specified number of args and function address
 540    into a call sequence of the above form stored at DUMMYNAME.  */
 541
 542 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
 543 { *(int *)((char *) dummyname + CALL_DUMMY_START_OFFSET + 2) = fun;  \
 544   *(int *)((char *) dummyname + CALL_DUMMY_START_OFFSET + 8) = nargs * 4; }
 545
 546 /* Push an empty stack frame, to record the current PC, etc.  */
 547
 548 #define PUSH_DUMMY_FRAME        { m68k_push_dummy_frame (); }
 549
 550 /* Discard from the stack the innermost frame, restoring all registers.  */
 551
 552 #define POP_FRAME               { m68k_pop_frame (); }
 553