gdb/m-merlin.h

   1 /* Definitions to make GDB run on a merlin under utek 2.1
   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 #ifndef ns16000
  21 #define ns16000
  22 #endif
  23
  24 /* Define the bit, byte, and word ordering of the machine.  */
  25 /* #define BITS_BIG_ENDIAN */
  26 /* #define BYTES_BIG_ENDIAN */
  27 /* #define WORDS_BIG_ENDIAN */
  28
  29 # include       <machine/reg.h>
  30
  31 /* Define this if the C compiler puts an underscore at the front
  32    of external names before giving them to the linker.  */
  33
  34 #define NAMES_HAVE_UNDERSCORE
  35
  36 /* Debugger information will be in DBX format.  */
  37
  38 #define READ_DBX_FORMAT
  39
  40 /* Offset from address of function to start of its code.
  41    Zero on most machines.  */
  42
  43 #define FUNCTION_START_OFFSET 0
  44
  45 /* Advance PC across any function entry prologue instructions
  46    to reach some "real" code.  */
  47
  48 #define SKIP_PROLOGUE(pc)                               \
  49 { register int op = read_memory_integer (pc, 1);        \
  50   if (op == 0x82)                                       \
  51     { op = read_memory_integer (pc+2,1);                \
  52       if ((op & 0x80) == 0) pc += 3;                    \
  53       else if ((op & 0xc0) == 0x80) pc += 4;            \
  54       else pc += 6;                                     \
  55     }}
  56
  57 /* Immediately after a function call, return the saved pc.
  58    Can't always go through the frames for this because on some machines
  59    the new frame is not set up until the new function executes
  60    some instructions.  */
  61
  62 #define SAVED_PC_AFTER_CALL(frame) \
  63         read_memory_integer (read_register (SP_REGNUM), 4)
  64
  65 /* This is the amount to subtract from u.u_ar0
  66    to get the offset in the core file of the register values.  */
  67
  68 #define KERNEL_U_ADDR (0xfef000)
  69
  70 /* Address of end of stack space.  */
  71
  72 #define STACK_END_ADDR (0x800000)
  73
  74 /* Stack grows downward.  */
  75
  76 #define INNER_THAN <
  77
  78 /* Sequence of bytes for breakpoint instruction.  */
  79
  80 #define BREAKPOINT {0xf2}
  81
  82 /* Amount PC must be decremented by after a breakpoint.
  83    This is often the number of bytes in BREAKPOINT
  84    but not always.  */
  85
  86 #define DECR_PC_AFTER_BREAK 0
  87
  88 /* Nonzero if instruction at PC is a return instruction.  */
  89
  90 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x12)
  91
  92 /* Return 1 if P points to an invalid floating point value.  */
  93
  94 #define INVALID_FLOAT(p, len) 0
  95
  96 /* Define this to say that the "svc" insn is followed by
  97    codes in memory saying which kind of system call it is.  */
  98
  99 #define NS32K_SVC_IMMED_OPERANDS
 100
 101 /* Largest integer type */
 102 #define LONGEST long
 103
 104 /* Name of the builtin type for the LONGEST type above. */
 105 #define BUILTIN_TYPE_LONGEST builtin_type_long
 106
 107 /* Say how long (ordinary) registers are.  */
 108
 109 #define REGISTER_TYPE long
 110
 111 /* Number of machine registers */
 112
 113 #define NUM_REGS                25
 114
 115 #define NUM_GENERAL_REGS        8
 116
 117 /* Initializer for an array of names of registers.
 118    There should be NUM_REGS strings in this initializer.  */
 119
 120 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
 121                         "pc", "sp", "fp", "ps",                         \
 122                         "fsr",                                          \
 123                         "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
 124                         "l0", "l1", "l2", "l3", "l4",                   \
 125                         }
 126
 127 /* Register numbers of various important registers.
 128    Note that some of these values are "real" register numbers,
 129    and correspond to the general registers of the machine,
 130    and some are "phony" register numbers which are too large
 131    to be actual register numbers as far as the user is concerned
 132    but do serve to get the desired values when passed to read_register.  */
 133
 134 #define AP_REGNUM FP_REGNUM
 135 #define FP_REGNUM 10            /* Contains address of executing stack frame */
 136 #define SP_REGNUM 9             /* Contains address of top of stack */
 137 #define PC_REGNUM 8             /* Contains program counter */
 138 #define PS_REGNUM 11            /* Contains processor status */
 139 #define FPS_REGNUM 12           /* Floating point status register */
 140 #define FP0_REGNUM 13           /* Floating point register 0 */
 141 #define LP0_REGNUM 21           /* Double register 0 (same as FP0) */
 142
 143 #define REGISTER_U_ADDR(addr, blockend, regno) \
 144 {                                                                       \
 145   switch (regno) {                                                      \
 146   case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:       \
 147         addr = blockend + (R0 - regno) * sizeof (int); break;           \
 148   case PC_REGNUM:                                                       \
 149         addr = blockend + PC * sizeof (int); break;                     \
 150   case SP_REGNUM:                                                       \
 151         addr = blockend + SP * sizeof (int); break;                     \
 152   case FP_REGNUM:                                                       \
 153         addr = blockend + FP * sizeof (int); break;                     \
 154   case PS_REGNUM:                                                       \
 155         addr = blockend + 12 * sizeof (int); break;                     \
 156   case FPS_REGNUM:                                                      \
 157         addr = 108; break;                                              \
 158   case FP0_REGNUM + 0: case FP0_REGNUM + 1:                             \
 159   case FP0_REGNUM + 2: case FP0_REGNUM + 3:                             \
 160   case FP0_REGNUM + 4: case FP0_REGNUM + 5:                             \
 161   case FP0_REGNUM + 6: case FP0_REGNUM + 7:                             \
 162         addr = 76 + (regno - FP0_REGNUM) * sizeof (float); break;       \
 163   case LP0_REGNUM + 0: case LP0_REGNUM + 1:                             \
 164   case LP0_REGNUM + 2: case LP0_REGNUM + 3:                             \
 165         addr = 76 + (regno - LP0_REGNUM) * sizeof (double); break;      \
 166   default:                                                              \
 167         printf ("bad argument to REGISTER_U_ADDR %d\n", regno);         \
 168         abort ();                                                       \
 169   }                                                                     \
 170 }
 171
 172 /* Total amount of space needed to store our copies of the machine's
 173    register state, the array `registers'.  */
 174 #define REGISTER_BYTES ((NUM_REGS - 4) * sizeof (int) + 4 * sizeof (double))
 175
 176 /* Index within `registers' of the first byte of the space for
 177    register N.  */
 178
 179 #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
 180         LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
 181
 182 /* Number of bytes of storage in the actual machine representation
 183    for register N.  On the 32000, all regs are 4 bytes
 184    except for the doubled floating registers. */
 185
 186 #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 187
 188 /* Number of bytes of storage in the program's representation
 189    for register N.  On the 32000, all regs are 4 bytes
 190    except for the doubled floating registers. */
 191
 192 #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 193
 194 /* Largest value REGISTER_RAW_SIZE can have.  */
 195
 196 #define MAX_REGISTER_RAW_SIZE 8
 197
 198 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 199
 200 #define MAX_REGISTER_VIRTUAL_SIZE 8
 201
 202 /* Nonzero if register N requires conversion
 203    from raw format to virtual format.  */
 204
 205 #define REGISTER_CONVERTIBLE(N) 0
 206
 207 /* Convert data from raw format for register REGNUM
 208    to virtual format for register REGNUM.  */
 209
 210 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 211   bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
 212
 213 /* Convert data from virtual format for register REGNUM
 214    to raw format for register REGNUM.  */
 215
 216 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 217   bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
 218
 219 /* Return the GDB type object for the "standard" data type
 220    of data in register N.  */
 221
 222 #define REGISTER_VIRTUAL_TYPE(N) \
 223   ((N) >= FP0_REGNUM ?          \
 224     ((N) >= LP0_REGNUM ?        \
 225      builtin_type_double        \
 226      : builtin_type_float)      \
 227    : builtin_type_int)
 228
 229 /* Store the address of the place in which to copy the structure the
 230    subroutine will return.  This is called from call_function.
 231
 232    On this machine this is a no-op, as gcc doesn't run on it yet.
 233    This calling convention is not used. */
 234
 235 #define STORE_STRUCT_RETURN(ADDR, SP)
 236
 237 /* Extract from an array REGBUF containing the (raw) register state
 238    a function return value of type TYPE, and copy that, in virtual format,
 239    into VALBUF.  */
 240
 241 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 242   bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
 243
 244 /* Write into appropriate registers a function return value
 245    of type TYPE, given in virtual format.  */
 246
 247 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 248   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 249
 250 /* Extract from an array REGBUF containing the (raw) register state
 251    the address in which a function should return its structure value,
 252    as a CORE_ADDR (or an expression that can be used as one).  */
 253
 254 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 255 \f
 256 /* Describe the pointer in each stack frame to the previous stack frame
 257    (its caller).  */
 258
 259 /* FRAME_CHAIN takes a frame's nominal address
 260    and produces the frame's chain-pointer.
 261
 262    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 263    and produces the nominal address of the caller frame.
 264
 265    However, if FRAME_CHAIN_VALID returns zero,
 266    it means the given frame is the outermost one and has no caller.
 267    In that case, FRAME_CHAIN_COMBINE is not used.  */
 268
 269 /* In the case of the Merlin, the frame's nominal address is the FP value,
 270    and at that address is saved previous FP value as a 4-byte word.  */
 271
 272 #define FRAME_CHAIN(thisframe)  \
 273   (outside_startup_file ((thisframe)->pc) ? \
 274    read_memory_integer ((thisframe)->frame, 4) :\
 275    0)
 276
 277 #define FRAME_CHAIN_VALID(chain, thisframe) \
 278   (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
 279
 280 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 281
 282 /* Define other aspects of the stack frame.  */
 283
 284 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 285
 286 /* compute base of arguments */
 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(numargs, fi)                     \
 295 { CORE_ADDR pc;                                         \
 296   int insn;                                             \
 297   int addr_mode;                                        \
 298   int width;                                            \
 299                                                         \
 300   pc = FRAME_SAVED_PC (fi);                             \
 301   insn = read_memory_integer (pc,2);                    \
 302   addr_mode = (insn >> 11) & 0x1f;                      \
 303   insn = insn & 0x7ff;                                  \
 304   if ((insn & 0x7fc) == 0x57c                           \
 305       && addr_mode == 0x14) /* immediate */             \
 306     { if (insn == 0x57c) /* adjspb */                   \
 307         width = 1;                                      \
 308       else if (insn == 0x57d) /* adjspw */              \
 309         width = 2;                                      \
 310       else if (insn == 0x57f) /* adjspd */              \
 311         width = 4;                                      \
 312       numargs = read_memory_integer (pc+2,width);       \
 313       if (width > 1)                                    \
 314         flip_bytes (&numargs, width);                   \
 315       numargs = - sign_extend (numargs, width*8) / 4; } \
 316   else numargs = -1;                                    \
 317 }
 318
 319 /* Return number of bytes at start of arglist that are not really args.  */
 320
 321 #define FRAME_ARGS_SKIP 8
 322
 323 /* Put here the code to store, into a struct frame_saved_regs,
 324    the addresses of the saved registers of frame described by FRAME_INFO.
 325    This includes special registers such as pc and fp saved in special
 326    ways in the stack frame.  sp is even more special:
 327    the address we return for it IS the sp for the next frame.  */
 328
 329 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 330 { int regmask,regnum;                                           \
 331   int localcount;                                               \
 332   CORE_ADDR enter_addr;                                         \
 333   CORE_ADDR next_addr;                                          \
 334                                                                 \
 335   enter_addr = get_pc_function_start ((frame_info)->pc);        \
 336   regmask = read_memory_integer (enter_addr+1, 1);              \
 337   localcount = ns32k_localcount (enter_addr);                   \
 338   next_addr = (frame_info)->frame + localcount;                 \
 339   for (regnum = 0; regnum < 8; regnum++, regmask >>= 1)         \
 340     (frame_saved_regs).regs[regnum]                             \
 341       = (regmask & 1) ? (next_addr -= 4) : 0;                   \
 342   (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4; \
 343   (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \
 344   (frame_saved_regs).regs[FP_REGNUM]                            \
 345      = read_memory_integer ((frame_info)->frame, 4); }
 346
 347 /* Compensate for lack of `vprintf' function.  */
 348 #ifndef HAVE_VPRINTF
 349 #define vprintf(format, ap) _doprnt (format, ap, stdout)
 350 #endif /* not HAVE_VPRINTF */
 351 \f
 352 /* Things needed for making the inferior call functions.  */
 353
 354 /* Push an empty stack frame, to record the current PC, etc.  */
 355
 356 #define PUSH_DUMMY_FRAME \
 357 { register CORE_ADDR sp = read_register (SP_REGNUM);    \
 358   register int regnum;                                  \
 359   sp = push_word (sp, read_register (PC_REGNUM));       \
 360   sp = push_word (sp, read_register (FP_REGNUM));       \
 361   write_register (FP_REGNUM, sp);                       \
 362   for (regnum = 0; regnum < 8; regnum++)                \
 363     sp = push_word (sp, read_register (regnum));        \
 364   write_register (SP_REGNUM, sp);                       \
 365 }
 366
 367 /* Discard from the stack the innermost frame, restoring all registers.  */
 368
 369 #define POP_FRAME  \
 370 { register FRAME frame = get_current_frame ();                   \
 371   register CORE_ADDR fp;                                         \
 372   register int regnum;                                           \
 373   struct frame_saved_regs fsr;                                   \
 374   struct frame_info *fi;                                                 \
 375   fi = get_frame_info (frame);                                   \
 376   fp = fi->frame;                                                \
 377   get_frame_saved_regs (fi, &fsr);                               \
 378   for (regnum = 0; regnum < 8; regnum++)                         \
 379     if (fsr.regs[regnum])                                        \
 380       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
 381   write_register (FP_REGNUM, read_memory_integer (fp, 4));       \
 382   write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));   \
 383   write_register (SP_REGNUM, fp + 8);                            \
 384   flush_cached_frames ();                                        \
 385   set_current_frame (create_new_frame (read_register (FP_REGNUM),\
 386                                        read_pc ()));             \
 387 }
 388
 389 /* This sequence of words is the instructions
 390      enter      0xff,0          82 ff 00
 391      jsr        @0x00010203     7f ae c0 01 02 03
 392      adjspd     0x69696969      7f a5 01 02 03 04
 393      bpt                        f2
 394    Note this is 16 bytes.  */
 395
 396 #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
 397
 398 #define CALL_DUMMY_START_OFFSET 3
 399 #define CALL_DUMMY_LENGTH       16
 400 #define CALL_DUMMY_ADDR         5
 401 #define CALL_DUMMY_NARGS        11
 402
 403 /* Insert the specified number of args and function address
 404    into a call sequence of the above form stored at DUMMYNAME.  */
 405
 406 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, type)                 \
 407 { int flipped = fun | 0xc0000000;                               \
 408   flip_bytes (&flipped, 4);                                     \
 409   *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped;  \
 410   flipped = - nargs * 4;                                        \
 411   flip_bytes (&flipped, 4);                                     \
 412   *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \
 413 }
 414 \f
 415 #ifdef notdef
 416 /* Interface definitions for kernel debugger KDB.  */
 417
 418 /* Map machine fault codes into signal numbers.
 419    First subtract 0, divide by 4, then index in a table.
 420    Faults for which the entry in this table is 0
 421    are not handled by KDB; the program's own trap handler
 422    gets to handle then.  */
 423
 424 #define FAULT_CODE_ORIGIN 0
 425 #define FAULT_CODE_UNITS 4
 426 #define FAULT_TABLE    \
 427 { 0, SIGKILL, SIGSEGV, 0, 0, 0, 0, 0, \
 428   0, 0, SIGTRAP, SIGTRAP, 0, 0, 0, 0, \
 429   0, 0, 0, 0, 0, 0, 0, 0}
 430
 431 /* Start running with a stack stretching from BEG to END.
 432    BEG and END should be symbols meaningful to the assembler.
 433    This is used only for kdb.  */
 434
 435 #define INIT_STACK(beg, end)  \
 436 { asm (".globl end");         \
 437   asm ("movl $ end, sp");      \
 438   asm ("clrl fp"); }
 439
 440 /* Push the frame pointer register on the stack.  */
 441 #define PUSH_FRAME_PTR        \
 442   asm ("pushl fp");
 443
 444 /* Copy the top-of-stack to the frame pointer register.  */
 445 #define POP_FRAME_PTR  \
 446   asm ("movl (sp), fp");
 447
 448 /* After KDB is entered by a fault, push all registers
 449    that GDB thinks about (all NUM_REGS of them),
 450    so that they appear in order of ascending GDB register number.
 451    The fault code will be on the stack beyond the last register.  */
 452
 453 #define PUSH_REGISTERS        \
 454 { asm ("pushl 8(sp)");        \
 455   asm ("pushl 8(sp)");        \
 456   asm ("pushal 0x14(sp)");    \
 457   asm ("pushr $037777"); }
 458
 459 /* Assuming the registers (including processor status) have been
 460    pushed on the stack in order of ascending GDB register number,
 461    restore them and return to the address in the saved PC register.  */
 462
 463 #define POP_REGISTERS      \
 464 { asm ("popr $037777");    \
 465   asm ("subl2 $8,(sp)");   \
 466   asm ("movl (sp),sp");    \
 467   asm ("rei"); }
 468 #endif