gdb/m-convex.h

   1 /* Definitions to make GDB run on Convex Unix (4bsd)
   2    Copyright (C) 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 /* Include certain files for dbxread.c  */
  26 #include <convex/filehdr.h>
  27 #include <convex/opthdr.h>
  28 #include <convex/scnhdr.h>
  29 #include <nlist.h>
  30
  31 #define LONG_LONG
  32 #define ATTACH_DETACH
  33 #define HAVE_WAIT_STRUCT
  34 #define NO_SIGINTERRUPT
  35
  36 /* Get rid of any system-imposed stack limit if possible.  */
  37
  38 #define SET_STACK_LIMIT_HUGE
  39
  40 /* Define this if the C compiler puts an underscore at the front
  41    of external names before giving them to the linker.  */
  42
  43 #define NAMES_HAVE_UNDERSCORE
  44
  45 /* Debugger information will be in DBX format.  */
  46
  47 #define READ_DBX_FORMAT
  48
  49 /* There is come problem with the debugging symbols generated by the
  50    compiler such that the debugging symbol for the first line of a
  51    function overlap with the function prologue.  */
  52 #define PROLOGUE_FIRSTLINE_OVERLAP
  53
  54 /* When convex pcc says CHAR or SHORT, it provides the correct address.  */
  55
  56 #define BELIEVE_PCC_PROMOTION 1
  57
  58 /* Symbol types to ignore.  */
  59 /* 0xc4 is N_MONPT.  Use the numeric value for the benefit of people
  60    with (rather) old OS's.  */
  61 #define IGNORE_SYMBOL(TYPE) \
  62     (((TYPE) & ~N_EXT) == N_TBSS       \
  63      || ((TYPE) & ~N_EXT) == N_TDATA   \
  64      || ((TYPE) & ~N_EXT) == 0xc4)
  65
  66 /* Use SIGCONT rather than SIGTSTP because convex Unix occasionally
  67    turkeys SIGTSTP.  I think.  */
  68
  69 #define STOP_SIGNAL SIGCONT
  70
  71 /* Convex ld sometimes omits _etext.
  72    Get text segment end from a.out header in this case.  */
  73
  74 extern unsigned text_end;
  75 #define END_OF_TEXT_DEFAULT text_end
  76
  77 /* Use csh to do argument expansion so we get ~ and such.  */
  78
  79 /* Doesn't work.  */
  80 /* #define SHELL_FILE "/bin/csh" */
  81
  82 /* Offset from address of function to start of its code.
  83    Zero on most machines.  */
  84
  85 #define FUNCTION_START_OFFSET 0
  86
  87 /* Advance PC across any function entry prologue instructions
  88    to reach some "real" code.
  89    Convex prolog is:
  90        [sub.w #-,sp]            in one of 3 possible sizes
  91        [mov psw,-               fc/vc main program prolog
  92         and #-,-                  (skip it because the "mov psw" saves the
  93         mov -,psw]                 T bit, so continue gets a surprise trap)
  94        [and #-,sp]              fc/vc O2 main program prolog
  95        [ld.- -(ap),-]           pcc/gcc register arg loads
  96 */
  97
  98 #define SKIP_PROLOGUE(pc)  \
  99 { int op, ix;                                                           \
 100   op = read_memory_integer (pc, 2);                                     \
 101   if ((op & 0xffc7) == 0x5ac0) pc += 2;                                 \
 102   else if (op == 0x1580) pc += 4;                                       \
 103   else if (op == 0x15c0) pc += 6;                                       \
 104   if ((read_memory_integer (pc, 2) & 0xfff8) == 0x7c40                  \
 105       && (read_memory_integer (pc + 2, 2) & 0xfff8) == 0x1240           \
 106       && (read_memory_integer (pc + 8, 2) & 0xfff8) == 0x7c48)          \
 107     pc += 10;                                                           \
 108   if (read_memory_integer (pc, 2) == 0x1240) pc += 6;                   \
 109   for (;;) {                                                            \
 110     op = read_memory_integer (pc, 2);                                   \
 111     ix = (op >> 3) & 7;                                                 \
 112     if (ix != 6) break;                                                 \
 113     if ((op & 0xfcc0) == 0x3000) pc += 4;                               \
 114     else if ((op & 0xfcc0) == 0x3040) pc += 6;                          \
 115     else if ((op & 0xfcc0) == 0x2800) pc += 4;                          \
 116     else if ((op & 0xfcc0) == 0x2840) pc += 6;                          \
 117     else break;}}
 118
 119 /* Immediately after a function call, return the saved pc.
 120    (ignore frame and return *$sp so we can handle both calls and callq) */
 121
 122 #define SAVED_PC_AFTER_CALL(frame) \
 123     read_memory_integer (read_register (SP_REGNUM), 4)
 124
 125 /* Address of end of stack space.
 126    This is ((USRSTACK + 0xfff) & -0x1000)) from <convex/vmparam.h> but
 127    that expression depends on the kernel version; instead, fetch a
 128    page-zero pointer and get it from that.  This will be invalid if
 129    they ever change the way bkpt signals are delivered.  */
 130
 131 #define STACK_END_ADDR (0xfffff000 & *(unsigned *) 0x80000050)
 132
 133 /* User-mode traps push an extended rtn block,
 134    then fault with one of the following PCs */
 135
 136 #define is_trace_pc(pc)  ((unsigned) ((pc) - (*(int *) 0x80000040)) <= 4)
 137 #define is_arith_pc(pc)  ((unsigned) ((pc) - (*(int *) 0x80000044)) <= 4)
 138 #define is_break_pc(pc)  ((unsigned) ((pc) - (*(int *) 0x80000050)) <= 4)
 139
 140 /* We need to manipulate trap bits in the psw */
 141
 142 #define PSW_TRAP_FLAGS  0x69670000
 143 #define PSW_T_BIT       0x08000000
 144 #define PSW_S_BIT       0x01000000
 145
 146 /* Stack grows downward.  */
 147
 148 #define INNER_THAN <
 149
 150 /* Sequence of bytes for breakpoint instruction. (bkpt)  */
 151
 152 #define BREAKPOINT {0x7d,0x50}
 153
 154 /* Amount PC must be decremented by after a breakpoint.
 155    This is often the number of bytes in BREAKPOINT but not always.
 156    (The break PC needs to be decremented by 2, but we do it when the
 157    break frame is recognized and popped.  That way gdb can tell breaks
 158    from trace traps with certainty.) */
 159
 160 #define DECR_PC_AFTER_BREAK 0
 161
 162 /* Nonzero if instruction at PC is a return instruction. (rtn or rtnq) */
 163
 164 #define ABOUT_TO_RETURN(pc) \
 165     ((read_memory_integer (pc, 2) & 0xffe0) == 0x7c80)
 166
 167 /* Return 1 if P points to an invalid floating point value. */
 168
 169 #define INVALID_FLOAT(p,len)   0
 170
 171 /* Largest integer type */
 172
 173 #define LONGEST long long
 174
 175 /* Name of the builtin type for the LONGEST type above.  */
 176
 177 #undef BUILTIN_TYPE_LONGEST
 178 #define BUILTIN_TYPE_LONGEST builtin_type_long_long
 179
 180 /* Say how long (ordinary) registers are.  */
 181
 182 #define REGISTER_TYPE long long
 183
 184 /* Number of machine registers */
 185
 186 #define NUM_REGS 26
 187
 188 /* Initializer for an array of names of registers.
 189    There should be NUM_REGS strings in this initializer.  */
 190
 191 #define REGISTER_NAMES {"pc","psw","fp","ap","a5","a4","a3","a2","a1","sp",\
 192                         "s7","s6","s5","s4","s3","s2","s1","s0",\
 193                         "S7","S6","S5","S4","S3","S2","S1","S0"}
 194
 195 /* Register numbers of various important registers.
 196    Note that some of these values are "real" register numbers,
 197    and correspond to the general registers of the machine,
 198    and some are "phony" register numbers which are too large
 199    to be actual register numbers as far as the user is concerned
 200    but do serve to get the desired values when passed to read_register.  */
 201
 202 #define S0_REGNUM 25            /* the real S regs */
 203 #define S7_REGNUM 18
 204 #define s0_REGNUM 17            /* low-order halves of S regs */
 205 #define s7_REGNUM 10
 206 #define SP_REGNUM 9             /* A regs */
 207 #define A1_REGNUM 8
 208 #define A5_REGNUM 4
 209 #define AP_REGNUM 3
 210 #define FP_REGNUM 2             /* Contains address of executing stack frame */
 211 #define PS_REGNUM 1             /* Contains processor status */
 212 #define PC_REGNUM 0             /* Contains program counter */
 213
 214 /* convert dbx stab register number (from `r' declaration) to a gdb REGNUM */
 215
 216 #define STAB_REG_TO_REGNUM(value) \
 217       ((value) < 8 ? S0_REGNUM - (value) : SP_REGNUM - ((value) - 8))
 218
 219 /* Vector register numbers, not handled as ordinary regs.
 220    They are treated as convenience variables whose values are read
 221    from the inferior when needed.  */
 222
 223 #define V0_REGNUM 0
 224 #define V7_REGNUM 7
 225 #define VM_REGNUM 8
 226 #define VS_REGNUM 9
 227 #define VL_REGNUM 10
 228
 229 /* Total amount of space needed to store our copies of the machine's
 230    register state, the array `registers'.  */
 231 #define REGISTER_BYTES (4*10 + 8*8)
 232
 233 /* Index within `registers' of the first byte of the space for
 234    register N.
 235    NB: must match structure of struct syscall_context for correct operation */
 236
 237 #define REGISTER_BYTE(N) ((N) < s7_REGNUM ? 4*(N) : \
 238                           (N) < S7_REGNUM ? 44 + 8 * ((N)-s7_REGNUM) : \
 239                                             40 + 8 * ((N)-S7_REGNUM))
 240
 241 /* Number of bytes of storage in the actual machine representation
 242    for register N. */
 243
 244 #define REGISTER_RAW_SIZE(N) ((N) < S7_REGNUM ? 4 : 8)
 245
 246 /* Number of bytes of storage in the program's representation
 247    for register N.   */
 248
 249 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
 250
 251 /* Largest value REGISTER_RAW_SIZE can have.  */
 252
 253 #define MAX_REGISTER_RAW_SIZE 8
 254
 255 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 256
 257 #define MAX_REGISTER_VIRTUAL_SIZE 8
 258
 259 /* Nonzero if register N requires conversion
 260    from raw format to virtual format.  */
 261
 262 #define REGISTER_CONVERTIBLE(N) 0
 263
 264 /* Convert data from raw format for register REGNUM
 265    to virtual format for register REGNUM.  */
 266
 267 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 268    bcopy ((FROM), (TO), REGISTER_RAW_SIZE (REGNUM));
 269
 270 /* Convert data from virtual format for register REGNUM
 271    to raw format for register REGNUM.  */
 272
 273 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 274   bcopy ((FROM), (TO), REGISTER_RAW_SIZE (REGNUM));
 275
 276 /* Return the GDB type object for the "standard" data type
 277    of data in register N.  */
 278
 279 #define REGISTER_VIRTUAL_TYPE(N) \
 280    ((N) < S7_REGNUM ? builtin_type_int : builtin_type_long_long)
 281
 282 /* Store the address of the place in which to copy the structure the
 283    subroutine will return.  This is called from call_function. */
 284
 285 #define STORE_STRUCT_RETURN(ADDR, SP) \
 286   { write_register (A1_REGNUM, (ADDR)); }
 287
 288 /* Extract from an array REGBUF containing the (raw) register state
 289    a function return value of type TYPE, and copy that, in virtual format,
 290    into VALBUF.  */
 291
 292 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 293   bcopy (&((char *) REGBUF) [REGISTER_BYTE (S0_REGNUM) + \
 294                              8 - TYPE_LENGTH (TYPE)],\
 295          VALBUF, TYPE_LENGTH (TYPE))
 296
 297 /* Write into appropriate registers a function return value
 298    of type TYPE, given in virtual format.  */
 299
 300 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 301     write_register_bytes (REGISTER_BYTE (S0_REGNUM), VALBUF, 8)
 302
 303 /* Extract from an array REGBUF containing the (raw) register state
 304    the address in which a function should return its structure value,
 305    as a CORE_ADDR (or an expression that can be used as one).  */
 306
 307 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
 308     (*(int *) & ((char *) REGBUF) [REGISTER_BYTE (s0_REGNUM)])
 309
 310 /* Compensate for lack of `vprintf' function.  */
 311 #ifndef HAVE_VPRINTF
 312 #define vprintf(format, ap) _doprnt (format, ap, stdout)
 313 #endif /* not HAVE_VPRINTF */
 314
 315 /* Define trapped internal variable hooks to read and write
 316    vector and communication registers.  */
 317
 318 #define IS_TRAPPED_INTERNALVAR is_trapped_internalvar
 319 #define VALUE_OF_TRAPPED_INTERNALVAR value_of_trapped_internalvar
 320 #define SET_TRAPPED_INTERNALVAR set_trapped_internalvar
 321
 322 extern struct value *value_of_trapped_internalvar ();
 323
 324 /* Hooks to read data from soff exec and core files,
 325    and to describe the files.  */
 326
 327 #define XFER_CORE_FILE
 328 #define FILES_INFO_HOOK print_maps
 329
 330 /* Hook to call after creating inferior process.  */
 331
 332 #define CREATE_INFERIOR_HOOK create_inferior_hook
 333
 334 /* Hook to call to print a typeless integer value, normally printed in decimal.
 335    For convex, use hex instead if the number looks like an address.  */
 336
 337 #define PRINT_TYPELESS_INTEGER decout
 338
 339 /* For the native compiler, variables for a particular lexical context
 340    are listed after the beginning LBRAC instead of before in the
 341    executables list of symbols.  Using "gcc_compiled." to distinguish
 342    between GCC and native compiler doesn't work on Convex because the
 343    linker sorts the symbols to put "gcc_compiled." in the wrong place.
 344    desc is nonzero for native, zero for gcc.   */
 345 #define VARIABLES_INSIDE_BLOCK(desc) (desc != 0)
 346
 347 /* Pcc occaisionally puts an SO where there should be an SOL.   */
 348 #define PCC_SOL_BROKEN
 349
 350 /* Cannot execute with pc on the stack.  */
 351 #define CANNOT_EXECUTE_STACK
 352 \f
 353 /* Describe the pointer in each stack frame to the previous stack frame
 354    (its caller).  */
 355
 356 /* FRAME_CHAIN takes a frame_info with a frame's nominal address in fi->frame,
 357    and produces the frame's chain-pointer.
 358
 359    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 360    and produces the nominal address of the caller frame.
 361
 362    However, if FRAME_CHAIN_VALID returns zero,
 363    it means the given frame is the outermost one and has no caller.
 364    In that case, FRAME_CHAIN_COMBINE is not used.  */
 365
 366 /* (caller fp is saved at 8(fp)) */
 367
 368 #define FRAME_CHAIN(fi)   (read_memory_integer ((fi)->frame + 8, 4))
 369
 370 #define FRAME_CHAIN_VALID(chain, thisframe) \
 371   (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
 372
 373 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 374
 375 /* Define other aspects of the stack frame.  */
 376
 377 /* A macro that tells us whether the function invocation represented
 378    by FI does not have a frame on the stack associated with it.  If it
 379    does not, FRAMELESS is set to 1, else 0.
 380    On convex, check at the return address for `callq' -- if so, frameless,
 381    otherwise, not.  */
 382
 383 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 384 {                                                                       \
 385   extern CORE_ADDR text_start, text_end;                                \
 386   CORE_ADDR call_addr = SAVED_PC_AFTER_CALL (FI);                       \
 387   (FRAMELESS) = (call_addr >= text_start && call_addr < text_end        \
 388                  && read_memory_integer (call_addr - 6, 1) == 0x22);    \
 389 }
 390
 391 #define FRAME_SAVED_PC(fi) (read_memory_integer ((fi)->frame, 4))
 392
 393 #define FRAME_ARGS_ADDRESS(fi) (read_memory_integer ((fi)->frame + 12, 4))
 394
 395 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
 396
 397 /* Return number of args passed to a frame.
 398    Can return -1, meaning no way to tell.  */
 399
 400 #define FRAME_NUM_ARGS(numargs, fi)  \
 401 { numargs = read_memory_integer (FRAME_ARGS_ADDRESS (fi) - 4, 4); \
 402   if (numargs < 0 || numargs >= 256) numargs = -1;}
 403
 404 /* Return number of bytes at start of arglist that are not really args.  */
 405
 406 #define FRAME_ARGS_SKIP 0
 407
 408 /* Put here the code to store, into a struct frame_saved_regs,
 409    the addresses of the saved registers of frame described by FRAME_INFO.
 410    This includes special registers such as pc and fp saved in special
 411    ways in the stack frame.  sp is even more special:
 412    the address we return for it IS the sp for the next frame.  */
 413
 414 /* Normal (short) frames save only PC, FP, (callee's) AP.  To reasonably
 415    handle gcc and pcc register variables, scan the code following the
 416    call for the instructions the compiler inserts to reload register
 417    variables from stack slots and record the stack slots as the saved
 418    locations of those registers.  This will occasionally identify some
 419    random load as a saved register; this is harmless.  vc does not
 420    declare its register allocation actions in the stabs.  */
 421
 422 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)             \
 423 { register int regnum;                                                  \
 424   register int frame_length =   /* 3 short, 2 long, 1 extended, 0 context */\
 425       (read_memory_integer ((frame_info)->frame + 4, 4) >> 25) & 3;     \
 426   register CORE_ADDR frame_fp =                                         \
 427       read_memory_integer ((frame_info)->frame + 8, 4);                 \
 428   register CORE_ADDR next_addr;                                         \
 429   bzero (&frame_saved_regs, sizeof frame_saved_regs);                   \
 430   (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 0;         \
 431   (frame_saved_regs).regs[PS_REGNUM] = (frame_info)->frame + 4;         \
 432   (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame + 8;         \
 433   (frame_saved_regs).regs[AP_REGNUM] = frame_fp + 12;                   \
 434   next_addr = (frame_info)->frame + 12;                                 \
 435   if (frame_length < 3)                                                 \
 436     for (regnum = A5_REGNUM; regnum < SP_REGNUM; ++regnum)              \
 437       (frame_saved_regs).regs[regnum] = (next_addr += 4);               \
 438   if (frame_length < 2)                                                 \
 439     (frame_saved_regs).regs[SP_REGNUM] = (next_addr += 4);              \
 440   next_addr -= 4;                                                       \
 441   if (frame_length < 3)                                                 \
 442     for (regnum = S7_REGNUM; regnum < S0_REGNUM; ++regnum)              \
 443       (frame_saved_regs).regs[regnum] = (next_addr += 8);               \
 444   if (frame_length < 2)                                                 \
 445     (frame_saved_regs).regs[S0_REGNUM] = (next_addr += 8);              \
 446   else                                                                  \
 447     (frame_saved_regs).regs[SP_REGNUM] = next_addr + 8;                 \
 448   if (frame_length == 3) {                                              \
 449     CORE_ADDR pc = read_memory_integer ((frame_info)->frame, 4);        \
 450     int op, ix, disp;                                                   \
 451     op = read_memory_integer (pc, 2);                                   \
 452     if ((op & 0xffc7) == 0x1480) pc += 4;       /* add.w #-,sp */       \
 453     else if ((op & 0xffc7) == 0x58c0) pc += 2;  /* add.w #-,sp */       \
 454     op = read_memory_integer (pc, 2);                                   \
 455     if ((op & 0xffc7) == 0x2a06) pc += 4;       /* ld.w -,ap */         \
 456     for (;;) {                                                          \
 457       op = read_memory_integer (pc, 2);                                 \
 458       ix = (op >> 3) & 7;                                               \
 459       if ((op & 0xfcc0) == 0x2800) {            /* ld.- -,ak */         \
 460         regnum = SP_REGNUM - (op & 7);                                  \
 461         disp = read_memory_integer (pc + 2, 2);                         \
 462         pc += 4;}                                                       \
 463       else if ((op & 0xfcc0) == 0x2840) {       /* ld.- -,ak */         \
 464         regnum = SP_REGNUM - (op & 7);                                  \
 465         disp = read_memory_integer (pc + 2, 4);                         \
 466         pc += 6;}                                                       \
 467       if ((op & 0xfcc0) == 0x3000) {            /* ld.- -,sk */         \
 468         regnum = S0_REGNUM - (op & 7);                                  \
 469         disp = read_memory_integer (pc + 2, 2);                         \
 470         pc += 4;}                                                       \
 471       else if ((op & 0xfcc0) == 0x3040) {       /* ld.- -,sk */         \
 472         regnum = S0_REGNUM - (op & 7);                                  \
 473         disp = read_memory_integer (pc + 2, 4);                         \
 474         pc += 6;}                                                       \
 475       else if ((op & 0xff00) == 0x7100) {       /* br crossjump */      \
 476         pc += 2 * (char) op;                                            \
 477         continue;}                                                      \
 478       else if (op == 0x0140) {                  /* jmp crossjump */     \
 479         pc = read_memory_integer (pc + 2, 4);                           \
 480         continue;}                                                      \
 481       else break;                                                       \
 482       if ((frame_saved_regs).regs[regnum])                              \
 483         break;                                                          \
 484       if (ix == 7) disp += frame_fp;                                    \
 485       else if (ix == 6) disp += read_memory_integer (frame_fp + 12, 4); \
 486       else if (ix != 0) break;                                          \
 487       (frame_saved_regs).regs[regnum] =                                 \
 488         disp - 8 + (1 << ((op >> 8) & 3));                              \
 489       if (regnum >= S7_REGNUM)                                          \
 490         (frame_saved_regs).regs[regnum - S0_REGNUM + s0_REGNUM] =       \
 491           disp - 4 + (1 << ((op >> 8) & 3));                            \
 492     }                                                                   \
 493   }                                                                     \
 494 }
 495 \f
 496 /* Things needed for making the inferior call functions.  */
 497
 498 /* Push an empty stack frame, to record the current PC, etc.  */
 499
 500 #define PUSH_DUMMY_FRAME \
 501 { register CORE_ADDR sp = read_register (SP_REGNUM);                    \
 502   register int regnum;                                                  \
 503   char buf[8];                                                          \
 504   long word;                                                            \
 505   for (regnum = S0_REGNUM; regnum >= S7_REGNUM; --regnum) {             \
 506     read_register_bytes (REGISTER_BYTE (regnum), buf, 8);               \
 507     sp = push_bytes (sp, buf, 8);}                                      \
 508   for (regnum = SP_REGNUM; regnum >= FP_REGNUM; --regnum) {             \
 509     word = read_register (regnum);                                      \
 510     sp = push_bytes (sp, &word, 4);}                                    \
 511   word = (read_register (PS_REGNUM) &~ (3<<25)) | (1<<25);              \
 512   sp = push_bytes (sp, &word, 4);                                       \
 513   word = read_register (PC_REGNUM);                                     \
 514   sp = push_bytes (sp, &word, 4);                                       \
 515   write_register (SP_REGNUM, sp);                                       \
 516   write_register (FP_REGNUM, sp);                                       \
 517   write_register (AP_REGNUM, sp);}
 518
 519 /* Discard from the stack the innermost frame, restoring all registers.  */
 520
 521 #define POP_FRAME  do {\
 522   register CORE_ADDR fp = read_register (FP_REGNUM);        \
 523   register int regnum;                                      \
 524   register int frame_length =   /* 3 short, 2 long, 1 extended, 0 context */ \
 525       (read_memory_integer (fp + 4, 4) >> 25) & 3;          \
 526   char buf[8];                                              \
 527   write_register (PC_REGNUM, read_memory_integer (fp, 4));  \
 528   write_register (PS_REGNUM, read_memory_integer (fp += 4, 4));  \
 529   write_register (FP_REGNUM, read_memory_integer (fp += 4, 4));  \
 530   write_register (AP_REGNUM, read_memory_integer (fp += 4, 4));  \
 531   if (frame_length < 3)                                      \
 532     for (regnum = A5_REGNUM; regnum < SP_REGNUM; ++regnum)   \
 533       write_register (regnum, read_memory_integer (fp += 4, 4)); \
 534   if (frame_length < 2)                                      \
 535     write_register (SP_REGNUM, read_memory_integer (fp += 4, 4)); \
 536   fp -= 4;                                                      \
 537   if (frame_length < 3)                                         \
 538     for (regnum = S7_REGNUM; regnum < S0_REGNUM; ++regnum) {    \
 539       read_memory (fp += 8, buf, 8);                            \
 540       write_register_bytes (REGISTER_BYTE (regnum), buf, 8);}   \
 541   if (frame_length < 2) {                                       \
 542     read_memory (fp += 8, buf, 8);                              \
 543     write_register_bytes (REGISTER_BYTE (regnum), buf, 8);}     \
 544   else write_register (SP_REGNUM, fp + 8);                      \
 545   flush_cached_frames ();                                       \
 546   set_current_frame (create_new_frame (read_register (FP_REGNUM), \
 547                                        read_pc ()));            \
 548 } while (0)
 549
 550 /* This sequence of words is the instructions
 551      mov sp,ap
 552      pshea 69696969
 553      calls 32323232
 554      bkpt
 555    Note this is 16 bytes.  */
 556
 557 #define CALL_DUMMY {0x50860d4069696969LL,0x2140323232327d50LL}
 558
 559 #define CALL_DUMMY_START_OFFSET 0
 560
 561 /* Insert the specified number of args and function address
 562    into a call sequence of the above form stored at DUMMYNAME.  */
 563
 564 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, type)   \
 565 { *(int *)((char *) dummyname + 4) = nargs;     \
 566   *(int *)((char *) dummyname + 10) = fun; }
 567 \f
 568 /* Defs to read soff symbol tables, see dbxread.c */
 569
 570 #define NUMBER_OF_SYMBOLS    ((long) opthdr.o_nsyms)
 571 #define STRING_TABLE_OFFSET  ((long) filehdr.h_strptr)
 572 #define SYMBOL_TABLE_OFFSET  ((long) opthdr.o_symptr)
 573 #define STRING_TABLE_SIZE    ((long) filehdr.h_strsiz)
 574 #define SIZE_OF_TEXT_SEGMENT ((long) txthdr.s_size)
 575 #define ENTRY_POINT          ((long) opthdr.o_entry)
 576
 577 #define READ_STRING_TABLE_SIZE(BUFFER) \
 578     (BUFFER = STRING_TABLE_SIZE)
 579
 580 #define DECLARE_FILE_HEADERS \
 581   FILEHDR filehdr;                                                      \
 582   OPTHDR opthdr;                                                        \
 583   SCNHDR txthdr
 584
 585 #define READ_FILE_HEADERS(DESC,NAME) \
 586 {                                                                       \
 587   int n;                                                                \
 588   val = myread (DESC, &filehdr, sizeof filehdr);                        \
 589   if (val < 0)                                                          \
 590     perror_with_name (NAME);                                            \
 591   if (! IS_SOFF_MAGIC (filehdr.h_magic))                                \
 592     error ("%s: not an executable file.", NAME);                        \
 593   lseek (DESC, 0L, 0);                                                  \
 594   if (myread (DESC, &filehdr, sizeof filehdr) < 0)                      \
 595     perror_with_name (NAME);                                            \
 596   if (myread (DESC, &opthdr, filehdr.h_opthdr) <= 0)                    \
 597     perror_with_name (NAME);                                            \
 598   for (n = 0; n < filehdr.h_nscns; n++)                                 \
 599     {                                                                   \
 600       if (myread (DESC, &txthdr, sizeof txthdr) < 0)                    \
 601         perror_with_name (NAME);                                        \
 602       if ((txthdr.s_flags & S_TYPMASK) == S_TEXT)                       \
 603         break;                                                          \
 604     }                                                                   \
 605 }
 606 \f
 607 /* Interface definitions for kernel debugger KDB.  */
 608
 609 /* (no kdb) */