gdb/m-hp300bsd.h

   1 /* Parameters for execution on a Hewlett-Packard 9000/300, running bsd.
   2    Copyright (C) 1986, 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 /* Describe the endian nature of this machine.  */
  21 #define BITS_BIG_ENDIAN
  22 #define BYTES_BIG_ENDIAN
  23 #define WORDS_BIG_ENDIAN
  24
  25 /*
  26  * Configuration file for HP9000/300 series machine running
  27  * University of Utah's 4.3bsd port.  This is NOT for HP-UX.
  28  * Problems to hpbsd-bugs@cs.utah.edu
  29  */
  30
  31 #ifndef hp300
  32 #define hp300
  33 #endif
  34
  35 /* Watch out for NaNs */
  36
  37 #define IEEE_FLOAT
  38
  39 /* Get rid of any system-imposed stack limit if possible.  */
  40
  41 #define SET_STACK_LIMIT_HUGE
  42
  43 /* Define this if the C compiler puts an underscore at the front
  44    of external names before giving them to the linker.  */
  45
  46 #define NAMES_HAVE_UNDERSCORE
  47
  48 /* Debugger information will be in DBX format.  */
  49
  50 #define READ_DBX_FORMAT
  51
  52 /* Offset from address of function to start of its code.
  53    Zero on most machines.  */
  54
  55 #define FUNCTION_START_OFFSET 0
  56
  57 /* Advance PC across any function entry prologue instructions
  58    to reach some "real" code.  */
  59
  60 #define SKIP_PROLOGUE(pc)   \
  61 { register int op = read_memory_integer (pc, 2);        \
  62   if (op == 0047126)                            \
  63     pc += 4;   /* Skip link #word */                    \
  64   else if (op == 0044016)                       \
  65     pc += 6;   /* Skip link #long */                    \
  66 }
  67
  68 /* Immediately after a function call, return the saved pc.
  69    Can't go through the frames for this because on some machines
  70    the new frame is not set up until the new function executes
  71    some instructions.  */
  72
  73 #define SAVED_PC_AFTER_CALL(frame) \
  74 read_memory_integer (read_register (SP_REGNUM), 4)
  75
  76 /* This is the amount to subtract from u.u_ar0
  77    to get the offset in the core file of the register values.  */
  78
  79 #define KERNEL_U_ADDR kernel_u_addr
  80
  81 /* Same as offsetof macro from stddef.h (which 4.3BSD doesn't have).  */
  82 #define my_offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
  83
  84 /* On the HP300, sigtramp is in the u area.  Gak!  User struct is not
  85    mapped to the same virtual address in user/kernel address space
  86    (hence STACK_END_ADDR as opposed to KERNEL_U_ADDR).  */
  87 #define IN_SIGTRAMP(pc, name) \
  88   ((pc) >= STACK_END_ADDR + my_offsetof (struct user, u_pcb.pcb_sigc[0])   \
  89    && (pc) < STACK_END_ADDR + my_offsetof (struct user, u_pcb.pcb_sigc[12]) \
  90    )
  91
  92 /* Address of end of stack space.  */
  93
  94 #define STACK_END_ADDR 0xfff00000
  95
  96 /* Stack grows downward.  */
  97
  98 #define INNER_THAN <
  99
 100 /* Sequence of bytes for breakpoint instruction.  */
 101
 102 #define BREAKPOINT {0x4e, 0x42}
 103
 104 /* Amount PC must be decremented by after a breakpoint.
 105    This is often the number of bytes in BREAKPOINT
 106    but not always.  */
 107
 108 #define DECR_PC_AFTER_BREAK 2
 109
 110 /* Nonzero if instruction at PC is a return instruction.  */
 111
 112 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 2) == 0x4e75)
 113
 114 /* Return 1 if P points to an invalid floating point value.  */
 115
 116 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
 117
 118 /* Largest integer type */
 119 #define LONGEST long
 120
 121 /* Name of the builtin type for the LONGEST type above. */
 122 #define BUILTIN_TYPE_LONGEST builtin_type_long
 123
 124 /* Say how long (ordinary) registers are.  */
 125
 126 #define REGISTER_TYPE long
 127
 128 /* Number of machine registers */
 129
 130 #define NUM_REGS 29
 131
 132 /* Initializer for an array of names of registers.
 133    There should be NUM_REGS strings in this initializer.  */
 134
 135 #define REGISTER_NAMES  \
 136  {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \
 137   "a0", "a1", "a2", "a3", "a4", "a5", "a6", "sp", \
 138   "ps", "pc",  \
 139   "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \
 140   "fpcontrol", "fpstatus", "fpiaddr" }
 141
 142 /* Register numbers of various important registers.
 143    Note that some of these values are "real" register numbers,
 144    and correspond to the general registers of the machine,
 145    and some are "phony" register numbers which are too large
 146    to be actual register numbers as far as the user is concerned
 147    but do serve to get the desired values when passed to read_register.  */
 148
 149 #define FP_REGNUM 14            /* Contains address of executing stack frame */
 150 #define SP_REGNUM 15            /* Contains address of top of stack */
 151 #define PS_REGNUM 16            /* Contains processor status */
 152 #define PC_REGNUM 17            /* Contains program counter */
 153 #define FP0_REGNUM 18           /* Floating point register 0 */
 154 #define FPC_REGNUM 26           /* 68881 control register */
 155 #define FPS_REGNUM 27           /* 68881 status register */
 156
 157 /* Total amount of space needed to store our copies of the machine's
 158    register state, the array `registers'.  */
 159 #define REGISTER_BYTES (16*4+8*12+8+12)
 160
 161 /* Index within `registers' of the first byte of the space for
 162    register N.  */
 163
 164 #define REGISTER_BYTE(N)  \
 165  ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168    \
 166   : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72  \
 167   : (N) * 4)
 168
 169 /* Number of bytes of storage in the actual machine representation
 170    for register N.  On the 68000, all regs are 4 bytes
 171    except the floating point regs which are 12 bytes.  */
 172 /* Note that the unsigned cast here forces the result of the
 173    subtractiion to very high positive values if N < FP0_REGNUM */
 174
 175 #define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4)
 176
 177 /* Number of bytes of storage in the program's representation
 178    for register N.  On the 68000, all regs are 4 bytes
 179    except the floating point regs which are 8-byte doubles.  */
 180
 181 #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4)
 182
 183 /* Largest value REGISTER_RAW_SIZE can have.  */
 184
 185 #define MAX_REGISTER_RAW_SIZE 12
 186
 187 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 188
 189 #define MAX_REGISTER_VIRTUAL_SIZE 8
 190
 191 /* Nonzero if register N requires conversion
 192    from raw format to virtual format.  */
 193
 194 #define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8)
 195
 196 /* Convert data from raw format for register REGNUM
 197    to virtual format for register REGNUM.  */
 198
 199 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 200 { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 201     convert_from_68881 ((FROM), (TO));  \
 202   else                                  \
 203     bcopy ((FROM), (TO), 4); }
 204
 205 /* Convert data from virtual format for register REGNUM
 206    to raw format for register REGNUM.  */
 207
 208 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 209 { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 210     convert_to_68881 ((FROM), (TO));    \
 211   else                                  \
 212     bcopy ((FROM), (TO), 4); }
 213
 214 /* Return the GDB type object for the "standard" data type
 215    of data in register N.  */
 216
 217 #define REGISTER_VIRTUAL_TYPE(N) \
 218  (((unsigned)(N) - FP0_REGNUM) < 8 ? builtin_type_double : builtin_type_int)
 219
 220 /* Store the address of the place in which to copy the structure the
 221    subroutine will return.  This is called from call_function. */
 222
 223 #define STORE_STRUCT_RETURN(ADDR, SP) \
 224   { write_register (9, (ADDR)); }
 225
 226 /* Extract from an array REGBUF containing the (raw) register state
 227    a function return value of type TYPE, and copy that, in virtual format,
 228    into VALBUF.  */
 229
 230 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 231   bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
 232
 233 /* Write into appropriate registers a function return value
 234    of type TYPE, given in virtual format.  */
 235
 236 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 237   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 238
 239 /* Extract from an array REGBUF containing the (raw) register state
 240    the address in which a function should return its structure value,
 241    as a CORE_ADDR (or an expression that can be used as one).  */
 242
 243 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 244
 245 /* Compensate for lack of `vprintf' function.  */
 246 #ifndef HAVE_VPRINTF
 247 #define vprintf(format, ap) _doprnt (format, ap, stdout)
 248 #endif /* not HAVE_VPRINTF */
 249
 250 /* This is a piece of magic that is given a register number REGNO
 251    and as BLOCKEND the address in the system of the end of the user structure
 252    and stores in ADDR the address in the kernel or core dump
 253    of that register.  */
 254
 255 #define REGISTER_U_ADDR(addr, blockend, regno)                          \
 256 {                                                                       \
 257   if (regno < PS_REGNUM)                                                \
 258     addr = (int) &((struct frame *)(blockend))->f_regs[regno];          \
 259   else if (regno == PS_REGNUM)                                          \
 260     addr = (int) &((struct frame *)(blockend))->f_stackadj;             \
 261   else if (regno == PC_REGNUM)                                          \
 262     addr = (int) &((struct frame *)(blockend))->f_pc;                   \
 263   else if (regno < FPC_REGNUM)                                          \
 264     addr = (int)                                                        \
 265       &((struct user *)0)->u_pcb.pcb_fpregs.fpf_regs[((regno)-FP0_REGNUM)*3];\
 266   else if (regno == FPC_REGNUM)                                         \
 267     addr = (int) &((struct user *)0)->u_pcb.pcb_fpregs.fpf_fpcr;        \
 268   else if (regno == FPS_REGNUM)                                         \
 269     addr = (int) &((struct user *)0)->u_pcb.pcb_fpregs.fpf_fpsr;        \
 270   else                                                                  \
 271     addr = (int) &((struct user *)0)->u_pcb.pcb_fpregs.fpf_fpiar;       \
 272 }
 273 \f
 274 /* Describe the pointer in each stack frame to the previous stack frame
 275    (its caller).  */
 276
 277 /* FRAME_CHAIN takes a frame's nominal address
 278    and produces the frame's chain-pointer.
 279
 280    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 281    and produces the nominal address of the caller frame.
 282
 283    However, if FRAME_CHAIN_VALID returns zero,
 284    it means the given frame is the outermost one and has no caller.
 285    In that case, FRAME_CHAIN_COMBINE is not used.  */
 286
 287 /* In the case of the Sun, the frame's nominal address
 288    is the address of a 4-byte word containing the calling frame's address.  */
 289
 290 #define FRAME_CHAIN(thisframe)  \
 291   (outside_startup_file ((thisframe)->pc) ? \
 292    read_memory_integer ((thisframe)->frame, 4) :\
 293    0)
 294
 295 #define FRAME_CHAIN_VALID(chain, thisframe) \
 296   (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
 297
 298 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 299
 300 /* Define other aspects of the stack frame.  */
 301
 302 /* A macro that tells us whether the function invocation represented
 303    by FI does not have a frame on the stack associated with it.  If it
 304    does not, FRAMELESS is set to 1, else 0.  */
 305 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 306   FRAMELESS_LOOK_FOR_PROLOGUE(FI, FRAMELESS)
 307
 308 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 309
 310 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 311
 312 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 313
 314 /* Set VAL to the number of args passed to frame described by FI.
 315    Can set VAL to -1, meaning no way to tell.  */
 316
 317 /* We can't tell how many args there are
 318    now that the C compiler delays popping them.  */
 319 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 320
 321 #if 0
 322 #define FRAME_NUM_ARGS(val, fi)  \
 323 { register CORE_ADDR pc = FRAME_SAVED_PC (fi);                  \
 324   register int insn = 0177777 & read_memory_integer (pc, 2);    \
 325   val = 0;                                                      \
 326   if (insn == 0047757 || insn == 0157374)  /* lea W(sp),sp or addaw #W,sp */ \
 327     val = read_memory_integer (pc + 2, 2);                      \
 328   else if ((insn & 0170777) == 0050217 /* addql #N, sp */       \
 329            || (insn & 0170777) == 0050117)  /* addqw */         \
 330     { val = (insn >> 9) & 7; if (val == 0) val = 8; }           \
 331   else if (insn == 0157774) /* addal #WW, sp */                 \
 332     val = read_memory_integer (pc + 2, 4);                      \
 333   val >>= 2; }
 334 #endif
 335
 336 /* Return number of bytes at start of arglist that are not really args.  */
 337
 338 #define FRAME_ARGS_SKIP 8
 339
 340 /* Put here the code to store, into a struct frame_saved_regs,
 341    the addresses of the saved registers of frame described by FRAME_INFO.
 342    This includes special registers such as pc and fp saved in special
 343    ways in the stack frame.  sp is even more special:
 344    the address we return for it IS the sp for the next frame.  */
 345
 346 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)             \
 347 { register int regnum;                                                  \
 348   register int regmask;                                                 \
 349   register CORE_ADDR next_addr;                                         \
 350   register CORE_ADDR pc;                                                \
 351   int nextinsn;                                                         \
 352   bzero (&frame_saved_regs, sizeof frame_saved_regs);                   \
 353   if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \
 354       && (frame_info)->pc <= (frame_info)->frame)                       \
 355     { next_addr = (frame_info)->frame;                                  \
 356       pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\
 357   else                                                                  \
 358     { pc = get_pc_function_start ((frame_info)->pc);                    \
 359       /* Verify we have a link a6 instruction next;                     \
 360          if not we lose.  If we win, find the address above the saved   \
 361          regs using the amount of storage from the link instruction.  */\
 362       if (044016 == read_memory_integer (pc, 2))                        \
 363         next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 4), pc+=4; \
 364       else if (047126 == read_memory_integer (pc, 2))                   \
 365         next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 2), pc+=2; \
 366       else goto lose;                                                   \
 367       /* If have an addal #-n, sp next, adjust next_addr.  */           \
 368       if ((0177777 & read_memory_integer (pc, 2)) == 0157774)           \
 369         next_addr += read_memory_integer (pc += 2, 4), pc += 4;         \
 370     }                                                                   \
 371   /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */      \
 372   regmask = read_memory_integer (pc + 2, 2);                            \
 373   /* But before that can come an fmovem.  Check for it.  */             \
 374   nextinsn = 0xffff & read_memory_integer (pc, 2);                      \
 375   if (0xf227 == nextinsn                                                \
 376       && (regmask & 0xff00) == 0xe000)                                  \
 377     { pc += 4; /* Regmask's low bit is for register fp7, the first pushed */ \
 378       for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1)              \
 379         if (regmask & 1)                                                \
 380           (frame_saved_regs).regs[regnum] = (next_addr -= 12);          \
 381       regmask = read_memory_integer (pc + 2, 2); }                      \
 382   if (0044327 == read_memory_integer (pc, 2))                           \
 383     { pc += 4; /* Regmask's low bit is for register 0, the first written */ \
 384       for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)            \
 385         if (regmask & 1)                                                \
 386           (frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; }     \
 387   else if (0044347 == read_memory_integer (pc, 2))                      \
 388     { pc += 4; /* Regmask's low bit is for register 15, the first pushed */ \
 389       for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1)           \
 390         if (regmask & 1)                                                \
 391           (frame_saved_regs).regs[regnum] = (next_addr -= 4); }         \
 392   else if (0x2f00 == (0xfff0 & read_memory_integer (pc, 2)))            \
 393     { regnum = 0xf & read_memory_integer (pc, 2); pc += 2;              \
 394       (frame_saved_regs).regs[regnum] = (next_addr -= 4); }             \
 395   /* fmovemx to index of sp may follow.  */                             \
 396   regmask = read_memory_integer (pc + 2, 2);                            \
 397   nextinsn = 0xffff & read_memory_integer (pc, 2);                      \
 398   if (0xf236 == nextinsn                                                \
 399       && (regmask & 0xff00) == 0xf000)                                  \
 400     { pc += 10; /* Regmask's low bit is for register fp0, the first written */ \
 401       for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1)              \
 402         if (regmask & 1)                                                \
 403           (frame_saved_regs).regs[regnum] = (next_addr += 12) - 12;     \
 404       regmask = read_memory_integer (pc + 2, 2); }                      \
 405   /* clrw -(sp); movw ccr,-(sp) may follow.  */                         \
 406   if (0x426742e7 == read_memory_integer (pc, 4))                        \
 407     (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4);              \
 408   lose: ;                                                               \
 409   (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8;         \
 410   (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;             \
 411   (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;         \
 412 }
 413 \f
 414 /* Things needed for making the inferior call functions.  */
 415
 416 /* Push an empty stack frame, to record the current PC, etc.  */
 417
 418 #define PUSH_DUMMY_FRAME \
 419 { register CORE_ADDR sp = read_register (SP_REGNUM);                    \
 420   register int regnum;                                                  \
 421   char raw_buffer[12];                                                  \
 422   sp = push_word (sp, read_register (PC_REGNUM));                       \
 423   sp = push_word (sp, read_register (FP_REGNUM));                       \
 424   write_register (FP_REGNUM, sp);                                       \
 425   for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)         \
 426     { read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);     \
 427       sp = push_bytes (sp, raw_buffer, 12); }                           \
 428   for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)                   \
 429     sp = push_word (sp, read_register (regnum));                        \
 430   sp = push_word (sp, read_register (PS_REGNUM));                       \
 431   write_register (SP_REGNUM, sp);  }
 432
 433 /* Discard from the stack the innermost frame,
 434    restoring all saved registers.  */
 435
 436 #define POP_FRAME  \
 437 { register FRAME frame = get_current_frame ();                   \
 438   register CORE_ADDR fp;                                         \
 439   register int regnum;                                           \
 440   struct frame_saved_regs fsr;                                   \
 441   struct frame_info *fi;                                         \
 442   char raw_buffer[12];                                           \
 443   fi = get_frame_info (frame);                                   \
 444   fp = fi->frame;                                                \
 445   get_frame_saved_regs (fi, &fsr);                               \
 446   for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)  \
 447     if (fsr.regs[regnum])                                        \
 448       { read_memory (fsr.regs[regnum], raw_buffer, 12);          \
 449         write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); }\
 450   for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)            \
 451     if (fsr.regs[regnum])                                        \
 452       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
 453   if (fsr.regs[PS_REGNUM])                                       \
 454     write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \
 455   write_register (FP_REGNUM, read_memory_integer (fp, 4));       \
 456   write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));   \
 457   write_register (SP_REGNUM, fp + 8);                            \
 458   flush_cached_frames ();                                        \
 459   set_current_frame (create_new_frame (read_register (FP_REGNUM),\
 460                                         read_pc ())); }
 461
 462 /* This sequence of words is the instructions
 463      fmovem 0xff,-(sp)
 464      moveml 0xfffc,-(sp)
 465      clrw -(sp)
 466      movew ccr,-(sp)
 467      /..* The arguments are pushed at this point by GDB;
 468         no code is needed in the dummy for this.
 469         The CALL_DUMMY_START_OFFSET gives the position of
 470         the following jsr instruction.  *../
 471      jsr @#32323232
 472      addl #69696969,sp
 473      trap #2
 474      nop
 475 Note this is 28 bytes.
 476 We actually start executing at the jsr, since the pushing of the
 477 registers is done by PUSH_DUMMY_FRAME.  If this were real code,
 478 the arguments for the function called by the jsr would be pushed
 479 between the moveml and the jsr, and we could allow it to execute through.
 480 But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done,
 481 and we cannot allow the moveml to push the registers again lest they be
 482 taken for the arguments.  */
 483
 484 #define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e424e71}
 485
 486 #define CALL_DUMMY_LENGTH 28
 487
 488 #define CALL_DUMMY_START_OFFSET 12
 489
 490 /* Insert the specified number of args and function address
 491    into a call sequence of the above form stored at DUMMYNAME.  */
 492
 493 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, type)     \
 494 { *(int *)((char *) dummyname + 20) = nargs * 4;  \
 495   *(int *)((char *) dummyname + 14) = fun; }
 496 \f
 497 /* Interface definitions for kernel debugger KDB.  */
 498
 499 /* Map machine fault codes into signal numbers.
 500    First subtract 0, divide by 4, then index in a table.
 501    Faults for which the entry in this table is 0
 502    are not handled by KDB; the program's own trap handler
 503    gets to handle then.  */
 504
 505 #define FAULT_CODE_ORIGIN 0
 506 #define FAULT_CODE_UNITS 4
 507 #define FAULT_TABLE    \
 508 { 0, 0, 0, 0, SIGTRAP, 0, 0, 0, \
 509   0, SIGTRAP, 0, 0, 0, 0, 0, SIGKILL, \
 510   0, 0, 0, 0, 0, 0, 0, 0, \
 511   SIGILL }
 512
 513 /* Start running with a stack stretching from BEG to END.
 514    BEG and END should be symbols meaningful to the assembler.
 515    This is used only for kdb.  */
 516
 517 #define INIT_STACK(beg, end)  \
 518 { asm (".globl end");         \
 519   asm ("movel #end, sp");      \
 520   asm ("movel #0,a6"); }
 521
 522 /* Push the frame pointer register on the stack.  */
 523 #define PUSH_FRAME_PTR        \
 524   asm ("movel a6,sp@-");
 525
 526 /* Copy the top-of-stack to the frame pointer register.  */
 527 #define POP_FRAME_PTR  \
 528   asm ("movl sp@,a6");
 529
 530 /* After KDB is entered by a fault, push all registers
 531    that GDB thinks about (all NUM_REGS of them),
 532    so that they appear in order of ascending GDB register number.
 533    The fault code will be on the stack beyond the last register.  */
 534
 535 #define PUSH_REGISTERS        \
 536 { asm ("clrw -(sp)");         \
 537   asm ("pea sp@(10)");        \
 538   asm ("movem #0xfffe,sp@-"); }
 539
 540 /* Assuming the registers (including processor status) have been
 541    pushed on the stack in order of ascending GDB register number,
 542    restore them and return to the address in the saved PC register.  */
 543
 544 #define POP_REGISTERS          \
 545 { asm ("subil #8,sp@(28)");     \
 546   asm ("movem sp@,#0xffff"); \
 547   asm ("rte"); }