gdb/m-isi.h

   1 /* Definitions to make GDB run on an ISI Optimum V (3.05) under 4.3bsd.
   2    Copyright (C) 1987, 1989 Free Software Foundation, Inc.
   3
   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 /* This has not been tested on ISI's running BSD 4.2, but it will probably
  21    work.  */
  22
  23 /* Identify this machine */
  24 #ifndef ISI68K
  25 #define ISI68K
  26 #endif
  27
  28 /* Define the bit, byte, and word ordering of the machine.  */
  29 #define BITS_BIG_ENDIAN
  30 #define BYTES_BIG_ENDIAN
  31 #define WORDS_BIG_ENDIAN
  32
  33 /* Define this if the C compiler puts an underscore at the front
  34    of external names before giving them to the linker.  */
  35
  36 #define NAMES_HAVE_UNDERSCORE
  37
  38 /* Debugger information will be in DBX format.  */
  39
  40 #define READ_DBX_FORMAT
  41
  42 /* Offset from address of function to start of its code.
  43    Zero on most machines.  */
  44
  45 #define FUNCTION_START_OFFSET 0
  46
  47 /* Advance PC across any function entry prologue instructions
  48    to reach some "real" code.  */
  49
  50 #define SKIP_PROLOGUE(pc)   \
  51 { register int op = read_memory_integer (pc, 2);        \
  52   if (op == 0047126)                                    \
  53     pc += 4;   /* Skip link #word */                    \
  54   else if (op == 0044016)                               \
  55     pc += 6;   /* Skip link #long */                    \
  56   else if (op == 0060000)                               \
  57     pc += 4;   /* Skip bra #word */                     \
  58   else if (op == 00600377)                              \
  59     pc += 6;   /* skip bra #long */                     \
  60   else if ((op & 0177400) == 0060000)                   \
  61     pc += 2;   /* skip bra #char */                     \
  62 }
  63
  64
  65 /* Immediately after a function call, return the saved pc.
  66    Can't always go through the frames for this because on some machines
  67    the new frame is not set up until the new function executes
  68    some instructions.  */
  69
  70 #define SAVED_PC_AFTER_CALL(frame) \
  71 read_memory_integer (read_register (SP_REGNUM), 4)
  72
  73 /* This is the amount to subtract from u.u_ar0
  74    to get the offset in the core file of the register values.  */
  75
  76 /*#define KERNEL_U_ADDR 0x10800000*/
  77 #define KERNEL_U_ADDR 0
  78
  79 /* Address of end of stack space.  */
  80
  81 /*#define STACK_END_ADDR 0x10000000*/
  82 #define STACK_END_ADDR 0xfffe000
  83
  84 /* Stack grows downward.  */
  85
  86 #define INNER_THAN <
  87
  88 /* Sequence of bytes for breakpoint instruction.  */
  89
  90 #define BREAKPOINT {0x4e, 0x4f}
  91
  92 /* Data segment starts at etext rounded up to DATAROUND in {N,Z}MAGIC files */
  93
  94 #define DATAROUND       0x20000
  95 #define N_DATADDR(hdr)  (hdr.a_magic != OMAGIC ? \
  96         (hdr.a_text + DATAROUND) & ~(DATAROUND-1) : hdr.a_text)
  97
  98 /* Text segment starts at sizeof (struct exec) in {N,Z}MAGIC files */
  99
 100 #define N_TXTADDR(hdr)  (hdr.a_magic != OMAGIC ? sizeof (struct exec) : 0)
 101
 102 /* Amount PC must be decremented by after a breakpoint.
 103    This is often the number of bytes in BREAKPOINT
 104    but not always.
 105    On the ISI, the kernel resets the pc to the trap instr */
 106
 107 #define DECR_PC_AFTER_BREAK 0
 108
 109 /* Nonzero if instruction at PC is a return instruction.  */
 110
 111 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 2) == 0x4e75)
 112
 113 /* Return 1 if P points to an invalid floating point value.  */
 114
 115 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
 116
 117 /* Largest integer type */
 118 #define LONGEST long
 119
 120 /* Name of the builtin type for the LONGEST type above. */
 121 #define BUILTIN_TYPE_LONGEST builtin_type_long
 122
 123 /* Say how long registers are.  */
 124
 125 #define REGISTER_TYPE long
 126
 127 /* Number of machine registers */
 128 #define NUM_REGS 29
 129
 130 /* Initializer for an array of names of registers.
 131    There should be NUM_REGS strings in this initializer.  */
 132
 133 #define REGISTER_NAMES  \
 134  {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \
 135   "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \
 136   "ps", "pc",  \
 137   "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \
 138   "fpcontrol", "fpstatus", "fpiaddr" }
 139
 140 /* Register numbers of various important registers.
 141    Note that some of these values are "real" register numbers,
 142    and correspond to the general registers of the machine,
 143    and some are "phony" register numbers which are too large
 144    to be actual register numbers as far as the user is concerned
 145    but do serve to get the desired values when passed to read_register.  */
 146
 147 #define FP_REGNUM 14            /* Contains address of executing stack frame */
 148 #define SP_REGNUM 15            /* Contains address of top of stack */
 149 #define PS_REGNUM 16            /* Contains processor status */
 150 #define PC_REGNUM 17            /* Contains program counter */
 151 #define FP0_REGNUM 18           /* Floating point register 0 */
 152 #define FPC_REGNUM 26           /* 68881 control register */
 153
 154 /* expects blockend to be u.u_ar0 */
 155 extern int rloc[];      /* Defined in isi-dep.c */
 156 #define REGISTER_U_ADDR(addr, blockend, regno)                  \
 157 {       blockend &= UPAGES*NBPG - 1;                            \
 158         if (regno < 18) addr = (int)blockend + rloc[regno]*4;   \
 159         else if (regno < 26) addr = (int) &((struct user *)0)->u_68881_regs \
 160             + (regno - 18) * 12;                                \
 161         else if (regno < 29) addr = (int) &((struct user *)0)->u_68881_regs \
 162             + 8 * 12 + (regno - 26) * 4;                        \
 163 }
 164
 165 /* Total amount of space needed to store our copies of the machine's
 166    register state, the array `registers'.  */
 167 #define REGISTER_BYTES (16*4+8*12+8+20)
 168
 169 /* Index within `registers' of the first byte of the space for
 170    register N.  */
 171
 172 #define REGISTER_BYTE(N)  \
 173  ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168    \
 174   : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72  \
 175   : (N) * 4)
 176
 177 /* Number of bytes of storage in the actual machine representation
 178    for register N.  On the 68000, all regs are 4 bytes
 179    except the floating point regs which are 12 bytes.  */
 180
 181 #define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4)
 182
 183 /* Number of bytes of storage in the program's representation
 184    for register N.  On the 68000, all regs are 4 bytes
 185    except the floating point regs which are 8-byte doubles.  */
 186
 187 #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4)
 188
 189 /* Largest value REGISTER_RAW_SIZE can have.  */
 190
 191 #define MAX_REGISTER_RAW_SIZE 12
 192
 193 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 194
 195 #define MAX_REGISTER_VIRTUAL_SIZE 8
 196
 197 /* Nonzero if register N requires conversion
 198    from raw format to virtual format.  */
 199
 200 #define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8)
 201
 202 /* Convert data from raw format for register REGNUM
 203    to virtual format for register REGNUM.  */
 204
 205 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 206 { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 207     convert_from_68881 ((FROM), (TO));  \
 208   else                                  \
 209     bcopy ((FROM), (TO), 4); }
 210
 211 /* Convert data from virtual format for register REGNUM
 212    to raw format for register REGNUM.  */
 213
 214 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 215 { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 216     convert_to_68881 ((FROM), (TO));    \
 217   else                                  \
 218     bcopy ((FROM), (TO), 4); }
 219
 220 /* Return the GDB type object for the "standard" data type
 221    of data in register N.  */
 222
 223 #define REGISTER_VIRTUAL_TYPE(N) \
 224  (((unsigned)(N) - FP0_REGNUM) < 8 ? builtin_type_double : builtin_type_int)
 225
 226 /* Store the address of the place in which to copy the structure the
 227    subroutine will return.  This is called from call_function. */
 228
 229 #define STORE_STRUCT_RETURN(ADDR, SP) \
 230   { write_register (9, (ADDR)); }
 231
 232 /* Extract from an array REGBUF containing the (raw) register state
 233    a function return value of type TYPE, and copy that, in virtual format,
 234    into VALBUF.  */
 235
 236 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 237   bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
 238
 239 /* Write into appropriate registers a function return value
 240    of type TYPE, given in virtual format.  */
 241
 242 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 243   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 244
 245 /* Extract from an array REGBUF containing the (raw) register state
 246    the address in which a function should return its structure value,
 247    as a CORE_ADDR (or an expression that can be used as one).  */
 248
 249 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 250 \f
 251 /* Describe the pointer in each stack frame to the previous stack frame
 252    (its caller).  */
 253
 254 /* FRAME_CHAIN takes a frame's nominal address
 255    and produces the frame's chain-pointer.
 256
 257    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 258    and produces the nominal address of the caller frame.
 259
 260    However, if FRAME_CHAIN_VALID returns zero,
 261    it means the given frame is the outermost one and has no caller.
 262    In that case, FRAME_CHAIN_COMBINE is not used.  */
 263
 264 /* In the case of the ISI, the frame's nominal address
 265    is the address of a 4-byte word containing the calling frame's address.  */
 266
 267 #define FRAME_CHAIN(thisframe)  \
 268   (outside_startup_file ((thisframe)->pc) ? \
 269    read_memory_integer ((thisframe)->frame, 4) :\
 270    0)
 271
 272 #define FRAME_CHAIN_VALID(chain, thisframe) \
 273   (chain != 0 && outside_startup_file (FRAME_SAVED_PC (thisframe)))
 274
 275 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 276
 277 /* Define other aspects of the stack frame.  */
 278
 279 /* A macro that tells us whether the function invocation represented
 280    by FI does not have a frame on the stack associated with it.  If it
 281    does not, FRAMELESS is set to 1, else 0.  */
 282 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 283   FRAMELESS_LOOK_FOR_PROLOGUE(FI, FRAMELESS)
 284
 285 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 286
 287 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 288
 289 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 290
 291 /* Return number of args passed to a frame.
 292    Can return -1, meaning no way to tell.  */
 293
 294 #define FRAME_NUM_ARGS(val, fi)  \
 295 { register CORE_ADDR pc = FRAME_SAVED_PC (fi);                  \
 296   register int insn = 0177777 & read_memory_integer (pc, 2);    \
 297   val = 0;                                                      \
 298   if (insn == 0047757 || insn == 0157374)  /* lea W(sp),sp or addaw #W,sp */ \
 299     val = read_memory_integer (pc + 2, 2);                      \
 300   else if ((insn & 0170777) == 0050217 /* addql #N, sp */       \
 301            || (insn & 0170777) == 0050117)  /* addqw */         \
 302     { val = (insn >> 9) & 7; if (val == 0) val = 8; }           \
 303   else if (insn == 0157774) /* addal #WW, sp */                 \
 304     val = read_memory_integer (pc + 2, 4);                      \
 305   val >>= 2; }
 306
 307 /* Return number of bytes at start of arglist that are not really args.  */
 308
 309 #define FRAME_ARGS_SKIP 8
 310
 311 /* Put here the code to store, into a struct frame_saved_regs,
 312    the addresses of the saved registers of frame described by FRAME_INFO.
 313    This includes special registers such as pc and fp saved in special
 314    ways in the stack frame.  sp is even more special:
 315    the address we return for it IS the sp for the next frame.  */
 316
 317 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)             \
 318 { register int regnum;                                                  \
 319   register int regmask;                                                 \
 320   register CORE_ADDR next_addr;                                         \
 321   register CORE_ADDR pc;                                                \
 322   register int insn;                                                    \
 323   register int offset;                                                  \
 324   bzero (&frame_saved_regs, sizeof frame_saved_regs);                   \
 325   if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \
 326       && (frame_info)->pc <= (frame_info)->frame)                               \
 327     { next_addr = (frame_info)->frame;                                  \
 328       pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\
 329   else                                                                  \
 330     { pc = get_pc_function_start ((frame_info)->pc);                    \
 331       /* Verify we have a link a6 instruction next,                     \
 332          or a branch followed by a link a6 instruction;                 \
 333          if not we lose.  If we win, find the address above the saved   \
 334          regs using the amount of storage from the link instruction.  */\
 335 retry:                                                                  \
 336       insn = read_memory_integer (pc, 2);                               \
 337       if (insn == 044016)                                               \
 338         next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 4), pc+=4; \
 339       else if (insn == 047126)                                          \
 340         next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 2), pc+=2; \
 341       else if ((insn & 0177400) == 060000)      /* bra insn */          \
 342         { offset = insn & 0377;                                         \
 343           pc += 2;                              /* advance past bra */  \
 344           if (offset == 0)                      /* bra #word */         \
 345             offset = read_memory_integer (pc, 2), pc += 2;              \
 346           else if (offset == 0377)              /* bra #long */         \
 347             offset = read_memory_integer (pc, 4), pc += 4;              \
 348           pc += offset;                                                 \
 349           goto retry;                                                   \
 350       } else goto lose;                                                 \
 351       /* If have an addal #-n, sp next, adjust next_addr.  */           \
 352       if ((0177777 & read_memory_integer (pc, 2)) == 0157774)           \
 353         next_addr += read_memory_integer (pc += 2, 4), pc += 4;         \
 354     }                                                                   \
 355   /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */      \
 356   insn = read_memory_integer (pc, 2), pc += 2;                          \
 357   regmask = read_memory_integer (pc, 2);                                \
 358   if ((insn & 0177760) == 022700)       /* movl rn, (sp) */             \
 359     (frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr;   \
 360   else if ((insn & 0177760) == 024700)  /* movl rn, -(sp) */            \
 361     (frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr-=4; \
 362   else if (insn == 0044327)             /* moveml mask, (sp) */         \
 363     { pc += 2;                                                          \
 364       /* Regmask's low bit is for register 0, the first written */      \
 365       next_addr -= 4;                                                   \
 366       for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)            \
 367         if (regmask & 1)                                                \
 368           (frame_saved_regs).regs[regnum] = (next_addr += 4);           \
 369   } else if (insn == 0044347)           /* moveml mask, -(sp) */        \
 370     { pc += 2;                                                          \
 371       /* Regmask's low bit is for register 15, the first pushed */      \
 372       for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1)           \
 373         if (regmask & 1)                                                \
 374           (frame_saved_regs).regs[regnum] = (next_addr -= 4); }         \
 375   /* clrw -(sp); movw ccr,-(sp) may follow.  */                         \
 376   if (read_memory_integer (pc, 2) == 041147                             \
 377       && read_memory_integer (pc+2, 2) == 042347)                       \
 378     (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4);              \
 379   lose: ;                                                               \
 380   (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8;         \
 381   (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;             \
 382   (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;         \
 383 }
 384
 385 /* Compensate for lack of `vprintf' function.  */
 386 #ifndef HAVE_VPRINTF
 387 #define vprintf(format, ap) _doprnt (format, ap, stdout)
 388 #endif
 389 \f
 390 /* Things needed for making the inferior call functions.  */
 391
 392 /* Push an empty stack frame, to record the current PC, etc.  */
 393
 394 #define PUSH_DUMMY_FRAME \
 395 { register CORE_ADDR sp = read_register (SP_REGNUM);                    \
 396   register int regnum;                                                  \
 397   char raw_buffer[12];                                                  \
 398   sp = push_word (sp, read_register (PC_REGNUM));                       \
 399   sp = push_word (sp, read_register (FP_REGNUM));                       \
 400   write_register (FP_REGNUM, sp);                                       \
 401   for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)         \
 402     { read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);     \
 403       sp = push_bytes (sp, raw_buffer, 12); }                           \
 404   for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)                   \
 405     sp = push_word (sp, read_register (regnum));                        \
 406   sp = push_word (sp, read_register (PS_REGNUM));                       \
 407   write_register (SP_REGNUM, sp);  }
 408
 409 /* Discard from the stack the innermost frame, restoring all registers.  */
 410
 411 #define POP_FRAME  \
 412 { register FRAME frame = get_current_frame ();                          \
 413   register CORE_ADDR fp;                                                \
 414   register int regnum;                                                  \
 415   struct frame_saved_regs fsr;                                          \
 416   struct frame_info *fi;                                                \
 417   char raw_buffer[12];                                                  \
 418   fi = get_frame_info (frame);                                          \
 419   fp = fi->frame;                                                       \
 420   get_frame_saved_regs (fi, &fsr);                                      \
 421   for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)         \
 422     if (fsr.regs[regnum])                                               \
 423       { read_memory (fsr.regs[regnum], raw_buffer, 12);                 \
 424         write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); }\
 425   for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)                   \
 426     if (fsr.regs[regnum])                                               \
 427       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
 428   if (fsr.regs[PS_REGNUM])                                              \
 429     write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \
 430   write_register (FP_REGNUM, read_memory_integer (fp, 4));              \
 431   write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));          \
 432   write_register (SP_REGNUM, fp + 8);                                   \
 433   flush_cached_frames ();                                               \
 434   set_current_frame ( create_new_frame (read_register (FP_REGNUM),      \
 435                                         read_pc ())); }
 436
 437 /* This sequence of words is the instructions
 438      fmovem #<f0-f7>,-(sp)
 439      moveml 0xfffc,-(sp)
 440      clrw -(sp)
 441      movew ccr,-(sp)
 442      /..* The arguments are pushed at this point by GDB;
 443         no code is needed in the dummy for this.
 444         The CALL_DUMMY_START_OFFSET gives the position of
 445         the following jsr instruction.  *../
 446      jsr @#32323232
 447      addl #69696969,sp
 448      bpt
 449      nop
 450 Note this is 24 bytes.
 451 We actually start executing at the jsr, since the pushing of the
 452 registers is done by PUSH_DUMMY_FRAME.  If this were real code,
 453 the arguments for the function called by the jsr would be pushed
 454 between the moveml and the jsr, and we could allow it to execute through.
 455 But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done,
 456 and we cannot allow the moveml to push the registers again lest they be
 457 taken for the arguments.  */
 458
 459 #define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4f4e71}
 460
 461 #define CALL_DUMMY_LENGTH 28
 462
 463 #define CALL_DUMMY_START_OFFSET 12
 464
 465 /* Insert the specified number of args and function address
 466    into a call sequence of the above form stored at DUMMYNAME.  */
 467
 468 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, type)     \
 469 { *(int *)((char *) dummyname + 20) = nargs * 4;  \
 470   *(int *)((char *) dummyname + 14) = fun; }
 471 \f
 472 /* Interface definitions for kernel debugger KDB.  */
 473
 474 /* Map machine fault codes into signal numbers.
 475    First subtract 0, divide by 4, then index in a table.
 476    Faults for which the entry in this table is 0
 477    are not handled by KDB; the program's own trap handler
 478    gets to handle then.  */
 479
 480 #define FAULT_CODE_ORIGIN 0
 481 #define FAULT_CODE_UNITS 4
 482 #define FAULT_TABLE    \
 483 { 0, 0, 0, 0, SIGTRAP, 0, 0, 0, \
 484   0, SIGTRAP, 0, 0, 0, 0, 0, SIGKILL, \
 485   0, 0, 0, 0, 0, 0, 0, 0, \
 486   SIGILL }
 487
 488 /* Start running with a stack stretching from BEG to END.
 489    BEG and END should be symbols meaningful to the assembler.
 490    This is used only for kdb.  */
 491
 492 #define INIT_STACK(beg, end)  \
 493 { asm (".globl end");         \
 494   asm ("movl $ end, sp");      \
 495   asm ("clrl fp"); }
 496
 497 /* Push the frame pointer register on the stack.  */
 498 #define PUSH_FRAME_PTR        \
 499   asm ("movel fp, -(sp)");
 500
 501 /* Copy the top-of-stack to the frame pointer register.  */
 502 #define POP_FRAME_PTR  \
 503   asm ("movl (sp), fp");
 504
 505 /* After KDB is entered by a fault, push all registers
 506    that GDB thinks about (all NUM_REGS of them),
 507    so that they appear in order of ascending GDB register number.
 508    The fault code will be on the stack beyond the last register.  */
 509
 510 #define PUSH_REGISTERS        \
 511 { asm ("clrw -(sp)");         \
 512   asm ("pea 10(sp)");         \
 513   asm ("movem $ 0xfffe,-(sp)"); }
 514
 515 /* Assuming the registers (including processor status) have been
 516    pushed on the stack in order of ascending GDB register number,
 517    restore them and return to the address in the saved PC register.  */
 518
 519 #define POP_REGISTERS          \
 520 { asm ("subil $8,28(sp)");     \
 521   asm ("movem (sp),$ 0xffff"); \
 522   asm ("rte"); }