gdb/tm-convex.h

   1 /* Definitions to make GDB run on Convex Unix (4bsd)
   2    Copyright (C) 1989, 1991 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 #define TARGET_BYTE_ORDER BIG_ENDIAN
  21
  22 /* Define this if the C compiler puts an underscore at the front
  23    of external names before giving them to the linker.  */
  24
  25 #define NAMES_HAVE_UNDERSCORE
  26
  27 /* There is come problem with the debugging symbols generated by the
  28    compiler such that the debugging symbol for the first line of a
  29    function overlap with the function prologue.  */
  30 #define PROLOGUE_FIRSTLINE_OVERLAP
  31
  32 /* When convex pcc says CHAR or SHORT, it provides the correct address.  */
  33
  34 #define BELIEVE_PCC_PROMOTION 1
  35
  36 /* Symbol types to ignore.  */
  37 /* 0xc4 is N_MONPT.  Use the numeric value for the benefit of people
  38    with (rather) old OS's.  */
  39 #define IGNORE_SYMBOL(TYPE) \
  40     (((TYPE) & ~N_EXT) == N_TBSS       \
  41      || ((TYPE) & ~N_EXT) == N_TDATA   \
  42      || ((TYPE) & ~N_EXT) == 0xc4)
  43
  44 /* Offset from address of function to start of its code.
  45    Zero on most machines.  */
  46
  47 #define FUNCTION_START_OFFSET 0
  48
  49 /* Advance PC across any function entry prologue instructions
  50    to reach some "real" code.
  51    Convex prolog is:
  52        [sub.w #-,sp]            in one of 3 possible sizes
  53        [mov psw,-               fc/vc main program prolog
  54         and #-,-                  (skip it because the "mov psw" saves the
  55         mov -,psw]                 T bit, so continue gets a surprise trap)
  56        [and #-,sp]              fc/vc O2 main program prolog
  57        [ld.- -(ap),-]           pcc/gcc register arg loads
  58 */
  59
  60 #define SKIP_PROLOGUE(pc)  \
  61 { int op, ix;                                                           \
  62   op = read_memory_integer (pc, 2);                                     \
  63   if ((op & 0xffc7) == 0x5ac0) pc += 2;                                 \
  64   else if (op == 0x1580) pc += 4;                                       \
  65   else if (op == 0x15c0) pc += 6;                                       \
  66   if ((read_memory_integer (pc, 2) & 0xfff8) == 0x7c40                  \
  67       && (read_memory_integer (pc + 2, 2) & 0xfff8) == 0x1240           \
  68       && (read_memory_integer (pc + 8, 2) & 0xfff8) == 0x7c48)          \
  69     pc += 10;                                                           \
  70   if (read_memory_integer (pc, 2) == 0x1240) pc += 6;                   \
  71   for (;;) {                                                            \
  72     op = read_memory_integer (pc, 2);                                   \
  73     ix = (op >> 3) & 7;                                                 \
  74     if (ix != 6) break;                                                 \
  75     if ((op & 0xfcc0) == 0x3000) pc += 4;                               \
  76     else if ((op & 0xfcc0) == 0x3040) pc += 6;                          \
  77     else if ((op & 0xfcc0) == 0x2800) pc += 4;                          \
  78     else if ((op & 0xfcc0) == 0x2840) pc += 6;                          \
  79     else break;}}
  80
  81 /* Immediately after a function call, return the saved pc.
  82    (ignore frame and return *$sp so we can handle both calls and callq) */
  83
  84 #define SAVED_PC_AFTER_CALL(frame) \
  85     read_memory_integer (read_register (SP_REGNUM), 4)
  86
  87 /* Address of end of stack space.
  88    This is ((USRSTACK + 0xfff) & -0x1000)) from <convex/vmparam.h> but
  89    that expression depends on the kernel version; instead, fetch a
  90    page-zero pointer and get it from that.  This will be invalid if
  91    they ever change the way bkpt signals are delivered.  */
  92
  93 #define STACK_END_ADDR (0xfffff000 & *(unsigned *) 0x80000050)
  94
  95 /* User-mode traps push an extended rtn block,
  96    then fault with one of the following PCs */
  97
  98 #define is_trace_pc(pc)  ((unsigned) ((pc) - (*(int *) 0x80000040)) <= 4)
  99 #define is_arith_pc(pc)  ((unsigned) ((pc) - (*(int *) 0x80000044)) <= 4)
 100 #define is_break_pc(pc)  ((unsigned) ((pc) - (*(int *) 0x80000050)) <= 4)
 101
 102 /* We need to manipulate trap bits in the psw */
 103
 104 #define PSW_TRAP_FLAGS  0x69670000
 105 #define PSW_T_BIT       0x08000000
 106 #define PSW_S_BIT       0x01000000
 107
 108 /* Stack grows downward.  */
 109
 110 #define INNER_THAN <
 111
 112 /* Sequence of bytes for breakpoint instruction. (bkpt)  */
 113
 114 #define BREAKPOINT {0x7d,0x50}
 115
 116 /* Amount PC must be decremented by after a breakpoint.
 117    This is often the number of bytes in BREAKPOINT but not always.
 118    (The break PC needs to be decremented by 2, but we do it when the
 119    break frame is recognized and popped.  That way gdb can tell breaks
 120    from trace traps with certainty.) */
 121
 122 #define DECR_PC_AFTER_BREAK 0
 123
 124 /* Nonzero if instruction at PC is a return instruction. (rtn or rtnq) */
 125
 126 #define ABOUT_TO_RETURN(pc) \
 127     ((read_memory_integer (pc, 2) & 0xffe0) == 0x7c80)
 128
 129 /* Return 1 if P points to an invalid floating point value. */
 130
 131 #define INVALID_FLOAT(p,len)   0
 132
 133 /* Say how long (ordinary) registers are.  */
 134
 135 #define REGISTER_TYPE long long
 136
 137 /* Number of machine registers */
 138
 139 #define NUM_REGS 26
 140
 141 /* Initializer for an array of names of registers.
 142    There should be NUM_REGS strings in this initializer.  */
 143
 144 #define REGISTER_NAMES {"pc","psw","fp","ap","a5","a4","a3","a2","a1","sp",\
 145                         "s7","s6","s5","s4","s3","s2","s1","s0",\
 146                         "S7","S6","S5","S4","S3","S2","S1","S0"}
 147
 148 /* Register numbers of various important registers.
 149    Note that some of these values are "real" register numbers,
 150    and correspond to the general registers of the machine,
 151    and some are "phony" register numbers which are too large
 152    to be actual register numbers as far as the user is concerned
 153    but do serve to get the desired values when passed to read_register.  */
 154
 155 #define S0_REGNUM 25            /* the real S regs */
 156 #define S7_REGNUM 18
 157 #define s0_REGNUM 17            /* low-order halves of S regs */
 158 #define s7_REGNUM 10
 159 #define SP_REGNUM 9             /* A regs */
 160 #define A1_REGNUM 8
 161 #define A5_REGNUM 4
 162 #define AP_REGNUM 3
 163 #define FP_REGNUM 2             /* Contains address of executing stack frame */
 164 #define PS_REGNUM 1             /* Contains processor status */
 165 #define PC_REGNUM 0             /* Contains program counter */
 166
 167 /* convert dbx stab register number (from `r' declaration) to a gdb REGNUM */
 168
 169 #define STAB_REG_TO_REGNUM(value) \
 170       ((value) < 8 ? S0_REGNUM - (value) : SP_REGNUM - ((value) - 8))
 171
 172 /* Vector register numbers, not handled as ordinary regs.
 173    They are treated as convenience variables whose values are read
 174    from the inferior when needed.  */
 175
 176 #define V0_REGNUM 0
 177 #define V7_REGNUM 7
 178 #define VM_REGNUM 8
 179 #define VS_REGNUM 9
 180 #define VL_REGNUM 10
 181
 182 /* Total amount of space needed to store our copies of the machine's
 183    register state, the array `registers'.  */
 184 #define REGISTER_BYTES (4*10 + 8*8)
 185
 186 /* Index within `registers' of the first byte of the space for
 187    register N.
 188    NB: must match structure of struct syscall_context for correct operation */
 189
 190 #define REGISTER_BYTE(N) ((N) < s7_REGNUM ? 4*(N) : \
 191                           (N) < S7_REGNUM ? 44 + 8 * ((N)-s7_REGNUM) : \
 192                                             40 + 8 * ((N)-S7_REGNUM))
 193
 194 /* Number of bytes of storage in the actual machine representation
 195    for register N. */
 196
 197 #define REGISTER_RAW_SIZE(N) ((N) < S7_REGNUM ? 4 : 8)
 198
 199 /* Number of bytes of storage in the program's representation
 200    for register N.   */
 201
 202 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
 203
 204 /* Largest value REGISTER_RAW_SIZE can have.  */
 205
 206 #define MAX_REGISTER_RAW_SIZE 8
 207
 208 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 209
 210 #define MAX_REGISTER_VIRTUAL_SIZE 8
 211
 212 /* Nonzero if register N requires conversion
 213    from raw format to virtual format.  */
 214
 215 #define REGISTER_CONVERTIBLE(N) 0
 216
 217 /* Convert data from raw format for register REGNUM
 218    to virtual format for register REGNUM.  */
 219
 220 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 221    bcopy ((FROM), (TO), REGISTER_RAW_SIZE (REGNUM));
 222
 223 /* Convert data from virtual format for register REGNUM
 224    to raw format for register REGNUM.  */
 225
 226 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 227   bcopy ((FROM), (TO), REGISTER_RAW_SIZE (REGNUM));
 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) \
 233    ((N) < S7_REGNUM ? builtin_type_int : builtin_type_long_long)
 234
 235 /* Store the address of the place in which to copy the structure the
 236    subroutine will return.  This is called from call_function. */
 237
 238 #define STORE_STRUCT_RETURN(ADDR, SP) \
 239   { write_register (A1_REGNUM, (ADDR)); }
 240
 241 /* Extract from an array REGBUF containing the (raw) register state
 242    a function return value of type TYPE, and copy that, in virtual format,
 243    into VALBUF.  */
 244
 245 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 246   bcopy (&((char *) REGBUF) [REGISTER_BYTE (S0_REGNUM) + \
 247                              8 - TYPE_LENGTH (TYPE)],\
 248          VALBUF, TYPE_LENGTH (TYPE))
 249
 250 /* Write into appropriate registers a function return value
 251    of type TYPE, given in virtual format.  */
 252
 253 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 254     write_register_bytes (REGISTER_BYTE (S0_REGNUM), VALBUF, 8)
 255
 256 /* Extract from an array REGBUF containing the (raw) register state
 257    the address in which a function should return its structure value,
 258    as a CORE_ADDR (or an expression that can be used as one).  */
 259
 260 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
 261     (*(int *) & ((char *) REGBUF) [REGISTER_BYTE (s0_REGNUM)])
 262
 263 /* Define trapped internal variable hooks to read and write
 264    vector and communication registers.  */
 265
 266 #define IS_TRAPPED_INTERNALVAR is_trapped_internalvar
 267 #define VALUE_OF_TRAPPED_INTERNALVAR value_of_trapped_internalvar
 268 #define SET_TRAPPED_INTERNALVAR set_trapped_internalvar
 269
 270 extern struct value *value_of_trapped_internalvar ();
 271
 272 /* Hooks to read data from soff exec and core files,
 273    and to describe the files.  */
 274
 275 #define XFER_CORE_FILE
 276 #define FILES_INFO_HOOK print_maps
 277
 278 /* Hook to call to print a typeless integer value, normally printed in decimal.
 279    For convex, use hex instead if the number looks like an address.  */
 280
 281 #define PRINT_TYPELESS_INTEGER decout
 282
 283 /* For the native compiler, variables for a particular lexical context
 284    are listed after the beginning LBRAC instead of before in the
 285    executables list of symbols.  Using "gcc_compiled." to distinguish
 286    between GCC and native compiler doesn't work on Convex because the
 287    linker sorts the symbols to put "gcc_compiled." in the wrong place.
 288    desc is nonzero for native, zero for gcc.   */
 289 #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) (desc != 0)
 290
 291 /* Pcc occaisionally puts an SO where there should be an SOL.   */
 292 #define PCC_SOL_BROKEN
 293 \f
 294 /* Describe the pointer in each stack frame to the previous stack frame
 295    (its caller).  */
 296
 297 /* FRAME_CHAIN takes a frame_info with a frame's nominal address in fi->frame,
 298    and produces the frame's chain-pointer.
 299
 300    However, if FRAME_CHAIN_VALID returns zero,
 301    it means the given frame is the outermost one and has no caller.  */
 302
 303 /* (caller fp is saved at 8(fp)) */
 304
 305 #define FRAME_CHAIN(fi)   (read_memory_integer ((fi)->frame + 8, 4))
 306
 307 #define FRAME_CHAIN_VALID(chain, thisframe) \
 308   (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
 309
 310 /* Define other aspects of the stack frame.  */
 311
 312 /* We need the boundaries of the text in the exec file, as a kludge,
 313    for FRAMELESS_FUNCTION_INVOCATION and CALL_DUMMY_LOCATION. */
 314
 315 #define NEED_TEXT_START_END
 316
 317 /* A macro that tells us whether the function invocation represented
 318    by FI does not have a frame on the stack associated with it.  If it
 319    does not, FRAMELESS is set to 1, else 0.
 320    On convex, check at the return address for `callq' -- if so, frameless,
 321    otherwise, not.  */
 322
 323 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 324 {                                                                       \
 325   extern CORE_ADDR text_start, text_end;                                \
 326   CORE_ADDR call_addr = SAVED_PC_AFTER_CALL (FI);                       \
 327   (FRAMELESS) = (call_addr >= text_start && call_addr < text_end        \
 328                  && read_memory_integer (call_addr - 6, 1) == 0x22);    \
 329 }
 330
 331 #define FRAME_SAVED_PC(fi) (read_memory_integer ((fi)->frame, 4))
 332
 333 #define FRAME_ARGS_ADDRESS(fi) (read_memory_integer ((fi)->frame + 12, 4))
 334
 335 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
 336
 337 /* Return number of args passed to a frame.
 338    Can return -1, meaning no way to tell.  */
 339
 340 #define FRAME_NUM_ARGS(numargs, fi)  \
 341 { numargs = read_memory_integer (FRAME_ARGS_ADDRESS (fi) - 4, 4); \
 342   if (numargs < 0 || numargs >= 256) numargs = -1;}
 343
 344 /* Return number of bytes at start of arglist that are not really args.  */
 345
 346 #define FRAME_ARGS_SKIP 0
 347
 348 /* Put here the code to store, into a struct frame_saved_regs,
 349    the addresses of the saved registers of frame described by FRAME_INFO.
 350    This includes special registers such as pc and fp saved in special
 351    ways in the stack frame.  sp is even more special:
 352    the address we return for it IS the sp for the next frame.  */
 353
 354 /* Normal (short) frames save only PC, FP, (callee's) AP.  To reasonably
 355    handle gcc and pcc register variables, scan the code following the
 356    call for the instructions the compiler inserts to reload register
 357    variables from stack slots and record the stack slots as the saved
 358    locations of those registers.  This will occasionally identify some
 359    random load as a saved register; this is harmless.  vc does not
 360    declare its register allocation actions in the stabs.  */
 361
 362 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)             \
 363 { register int regnum;                                                  \
 364   register int frame_length =   /* 3 short, 2 long, 1 extended, 0 context */\
 365       (read_memory_integer ((frame_info)->frame + 4, 4) >> 25) & 3;     \
 366   register CORE_ADDR frame_fp =                                         \
 367       read_memory_integer ((frame_info)->frame + 8, 4);                 \
 368   register CORE_ADDR next_addr;                                         \
 369   bzero (&frame_saved_regs, sizeof frame_saved_regs);                   \
 370   (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 0;         \
 371   (frame_saved_regs).regs[PS_REGNUM] = (frame_info)->frame + 4;         \
 372   (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame + 8;         \
 373   (frame_saved_regs).regs[AP_REGNUM] = frame_fp + 12;                   \
 374   next_addr = (frame_info)->frame + 12;                                 \
 375   if (frame_length < 3)                                                 \
 376     for (regnum = A5_REGNUM; regnum < SP_REGNUM; ++regnum)              \
 377       (frame_saved_regs).regs[regnum] = (next_addr += 4);               \
 378   if (frame_length < 2)                                                 \
 379     (frame_saved_regs).regs[SP_REGNUM] = (next_addr += 4);              \
 380   next_addr -= 4;                                                       \
 381   if (frame_length < 3)                                                 \
 382     for (regnum = S7_REGNUM; regnum < S0_REGNUM; ++regnum)              \
 383       (frame_saved_regs).regs[regnum] = (next_addr += 8);               \
 384   if (frame_length < 2)                                                 \
 385     (frame_saved_regs).regs[S0_REGNUM] = (next_addr += 8);              \
 386   else                                                                  \
 387     (frame_saved_regs).regs[SP_REGNUM] = next_addr + 8;                 \
 388   if (frame_length == 3) {                                              \
 389     CORE_ADDR pc = read_memory_integer ((frame_info)->frame, 4);        \
 390     int op, ix, disp;                                                   \
 391     op = read_memory_integer (pc, 2);                                   \
 392     if ((op & 0xffc7) == 0x1480) pc += 4;       /* add.w #-,sp */       \
 393     else if ((op & 0xffc7) == 0x58c0) pc += 2;  /* add.w #-,sp */       \
 394     op = read_memory_integer (pc, 2);                                   \
 395     if ((op & 0xffc7) == 0x2a06) pc += 4;       /* ld.w -,ap */         \
 396     for (;;) {                                                          \
 397       op = read_memory_integer (pc, 2);                                 \
 398       ix = (op >> 3) & 7;                                               \
 399       if ((op & 0xfcc0) == 0x2800) {            /* ld.- -,ak */         \
 400         regnum = SP_REGNUM - (op & 7);                                  \
 401         disp = read_memory_integer (pc + 2, 2);                         \
 402         pc += 4;}                                                       \
 403       else if ((op & 0xfcc0) == 0x2840) {       /* ld.- -,ak */         \
 404         regnum = SP_REGNUM - (op & 7);                                  \
 405         disp = read_memory_integer (pc + 2, 4);                         \
 406         pc += 6;}                                                       \
 407       if ((op & 0xfcc0) == 0x3000) {            /* ld.- -,sk */         \
 408         regnum = S0_REGNUM - (op & 7);                                  \
 409         disp = read_memory_integer (pc + 2, 2);                         \
 410         pc += 4;}                                                       \
 411       else if ((op & 0xfcc0) == 0x3040) {       /* ld.- -,sk */         \
 412         regnum = S0_REGNUM - (op & 7);                                  \
 413         disp = read_memory_integer (pc + 2, 4);                         \
 414         pc += 6;}                                                       \
 415       else if ((op & 0xff00) == 0x7100) {       /* br crossjump */      \
 416         pc += 2 * (char) op;                                            \
 417         continue;}                                                      \
 418       else if (op == 0x0140) {                  /* jmp crossjump */     \
 419         pc = read_memory_integer (pc + 2, 4);                           \
 420         continue;}                                                      \
 421       else break;                                                       \
 422       if ((frame_saved_regs).regs[regnum])                              \
 423         break;                                                          \
 424       if (ix == 7) disp += frame_fp;                                    \
 425       else if (ix == 6) disp += read_memory_integer (frame_fp + 12, 4); \
 426       else if (ix != 0) break;                                          \
 427       (frame_saved_regs).regs[regnum] =                                 \
 428         disp - 8 + (1 << ((op >> 8) & 3));                              \
 429       if (regnum >= S7_REGNUM)                                          \
 430         (frame_saved_regs).regs[regnum - S0_REGNUM + s0_REGNUM] =       \
 431           disp - 4 + (1 << ((op >> 8) & 3));                            \
 432     }                                                                   \
 433   }                                                                     \
 434 }
 435 \f
 436 /* Things needed for making the inferior call functions.  */
 437
 438 #define CALL_DUMMY_LOCATION     BEFORE_TEXT_END
 439
 440 /* Push an empty stack frame, to record the current PC, etc.  */
 441
 442 #define PUSH_DUMMY_FRAME \
 443 { register CORE_ADDR sp = read_register (SP_REGNUM);                    \
 444   register int regnum;                                                  \
 445   char buf[8];                                                          \
 446   long word;                                                            \
 447   for (regnum = S0_REGNUM; regnum >= S7_REGNUM; --regnum) {             \
 448     read_register_bytes (REGISTER_BYTE (regnum), buf, 8);               \
 449     sp = push_bytes (sp, buf, 8);}                                      \
 450   for (regnum = SP_REGNUM; regnum >= FP_REGNUM; --regnum) {             \
 451     word = read_register (regnum);                                      \
 452     sp = push_bytes (sp, &word, 4);}                                    \
 453   word = (read_register (PS_REGNUM) &~ (3<<25)) | (1<<25);              \
 454   sp = push_bytes (sp, &word, 4);                                       \
 455   word = read_register (PC_REGNUM);                                     \
 456   sp = push_bytes (sp, &word, 4);                                       \
 457   write_register (SP_REGNUM, sp);                                       \
 458   write_register (FP_REGNUM, sp);                                       \
 459   write_register (AP_REGNUM, sp);}
 460
 461 /* Discard from the stack the innermost frame, restoring all registers.  */
 462
 463 #define POP_FRAME  do {\
 464   register CORE_ADDR fp = read_register (FP_REGNUM);        \
 465   register int regnum;                                      \
 466   register int frame_length =   /* 3 short, 2 long, 1 extended, 0 context */ \
 467       (read_memory_integer (fp + 4, 4) >> 25) & 3;          \
 468   char buf[8];                                              \
 469   write_register (PC_REGNUM, read_memory_integer (fp, 4));  \
 470   write_register (PS_REGNUM, read_memory_integer (fp += 4, 4));  \
 471   write_register (FP_REGNUM, read_memory_integer (fp += 4, 4));  \
 472   write_register (AP_REGNUM, read_memory_integer (fp += 4, 4));  \
 473   if (frame_length < 3)                                      \
 474     for (regnum = A5_REGNUM; regnum < SP_REGNUM; ++regnum)   \
 475       write_register (regnum, read_memory_integer (fp += 4, 4)); \
 476   if (frame_length < 2)                                      \
 477     write_register (SP_REGNUM, read_memory_integer (fp += 4, 4)); \
 478   fp -= 4;                                                      \
 479   if (frame_length < 3)                                         \
 480     for (regnum = S7_REGNUM; regnum < S0_REGNUM; ++regnum) {    \
 481       read_memory (fp += 8, buf, 8);                            \
 482       write_register_bytes (REGISTER_BYTE (regnum), buf, 8);}   \
 483   if (frame_length < 2) {                                       \
 484     read_memory (fp += 8, buf, 8);                              \
 485     write_register_bytes (REGISTER_BYTE (regnum), buf, 8);}     \
 486   else write_register (SP_REGNUM, fp + 8);                      \
 487   flush_cached_frames ();                                       \
 488   set_current_frame (create_new_frame (read_register (FP_REGNUM), \
 489                                        read_pc ()));            \
 490 } while (0)
 491
 492 /* This sequence of words is the instructions
 493      mov sp,ap
 494      pshea 69696969
 495      calls 32323232
 496      bkpt
 497    Note this is 16 bytes.  */
 498
 499 #define CALL_DUMMY {0x50860d4069696969LL,0x2140323232327d50LL}
 500
 501 #define CALL_DUMMY_LENGTH 16
 502
 503 #define CALL_DUMMY_START_OFFSET 0
 504
 505 /* Insert the specified number of args and function address
 506    into a call sequence of the above form stored at DUMMYNAME.  */
 507
 508 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   \
 509 { *(int *)((char *) dummyname + 4) = nargs;     \
 510   *(int *)((char *) dummyname + 10) = fun; }
 511 \f
 512 /* Defs to read soff symbol tables, see dbxread.c */
 513
 514 #define NUMBER_OF_SYMBOLS    ((long) opthdr.o_nsyms)
 515 #define STRING_TABLE_OFFSET  ((long) filehdr.h_strptr)
 516 #define SYMBOL_TABLE_OFFSET  ((long) opthdr.o_symptr)
 517 #define STRING_TABLE_SIZE    ((long) filehdr.h_strsiz)
 518 #define SIZE_OF_TEXT_SEGMENT ((long) txthdr.s_size)
 519 #define ENTRY_POINT          ((long) opthdr.o_entry)
 520
 521 #define READ_STRING_TABLE_SIZE(BUFFER) \
 522     (BUFFER = STRING_TABLE_SIZE)
 523
 524 #define DECLARE_FILE_HEADERS \
 525   FILEHDR filehdr;                                                      \
 526   OPTHDR opthdr;                                                        \
 527   SCNHDR txthdr
 528
 529 #define READ_FILE_HEADERS(DESC,NAME) \
 530 {                                                                       \
 531   int n;                                                                \
 532   val = myread (DESC, &filehdr, sizeof filehdr);                        \
 533   if (val < 0)                                                          \
 534     perror_with_name (NAME);                                            \
 535   if (! IS_SOFF_MAGIC (filehdr.h_magic))                                \
 536     error ("%s: not an executable file.", NAME);                        \
 537   lseek (DESC, 0L, 0);                                                  \
 538   if (myread (DESC, &filehdr, sizeof filehdr) < 0)                      \
 539     perror_with_name (NAME);                                            \
 540   if (myread (DESC, &opthdr, filehdr.h_opthdr) <= 0)                    \
 541     perror_with_name (NAME);                                            \
 542   for (n = 0; n < filehdr.h_nscns; n++)                                 \
 543     {                                                                   \
 544       if (myread (DESC, &txthdr, sizeof txthdr) < 0)                    \
 545         perror_with_name (NAME);                                        \
 546       if ((txthdr.s_flags & S_TYPMASK) == S_TEXT)                       \
 547         break;                                                          \
 548     }                                                                   \
 549 }