gdb/tm-umax.h

   1 /* Definitions to make GDB run on an encore under umax 4.2
   2    Copyright (C) 1987, 1989 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 LITTLE_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 /* Exec files and symbol tables are in COFF format */
  28
  29 #define COFF_FORMAT
  30
  31 /* Need to get function ends by adding this to epilogue address from .bf
  32    record, not using x_fsize field.  */
  33 #define FUNCTION_EPILOGUE_SIZE 4
  34
  35 /* Offset from address of function to start of its code.
  36    Zero on most machines.  */
  37
  38 #define FUNCTION_START_OFFSET 0
  39
  40 /* Advance PC across any function entry prologue instructions
  41    to reach some "real" code.  */
  42
  43 #define SKIP_PROLOGUE(pc)                               \
  44 { register unsigned char op = read_memory_integer (pc, 1);      \
  45   if (op == 0x82) { op = read_memory_integer (pc+2,1);  \
  46                     if ((op & 0x80) == 0) pc += 3;      \
  47                     else if ((op & 0xc0) == 0x80) pc += 4;      \
  48                     else pc += 6;                       \
  49                    }                                    \
  50 }
  51
  52 /* Immediately after a function call, return the saved pc.
  53    Can't always go through the frames for this because on some machines
  54    the new frame is not set up until the new function executes
  55    some instructions.  */
  56
  57 #define SAVED_PC_AFTER_CALL(frame) \
  58         read_memory_integer (read_register (SP_REGNUM), 4)
  59
  60 /* Address of end of stack space.  */
  61
  62 #define STACK_END_ADDR (0xfffff000)
  63
  64 /* Stack grows downward.  */
  65
  66 #define INNER_THAN <
  67
  68 /* Sequence of bytes for breakpoint instruction.  */
  69
  70 #define BREAKPOINT {0xf2}
  71
  72 /* Amount PC must be decremented by after a breakpoint.
  73    This is often the number of bytes in BREAKPOINT
  74    but not always.  */
  75
  76 #define DECR_PC_AFTER_BREAK 0
  77
  78 /* Nonzero if instruction at PC is a return instruction.  */
  79
  80 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x12)
  81
  82 #ifndef NaN
  83 #include <nan.h>
  84 #endif NaN
  85
  86 /* Return 1 if P points to an invalid floating point value.  */
  87 /* Surely wrong for cross-debugging.  */
  88 #define INVALID_FLOAT(p, s) \
  89          ((s == sizeof (float))?        \
  90                 NaF (*(float *) p) :    \
  91                 NaD (*(double *) p))
  92
  93 /* Say how long (ordinary) registers are.  */
  94
  95 #define REGISTER_TYPE long
  96
  97 /* Number of machine registers */
  98
  99 #define NUM_REGS                25
 100
 101 #define NUM_GENERAL_REGS        8
 102
 103 /* Initializer for an array of names of registers.
 104    There should be NUM_REGS strings in this initializer.  */
 105
 106 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
 107                         "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
 108                         "sp", "fp", "pc", "ps",                         \
 109                         "fsr",                                          \
 110                         "l0", "l1", "l2", "l3", "xx",                   \
 111                         }
 112
 113 /* Register numbers of various important registers.
 114    Note that some of these values are "real" register numbers,
 115    and correspond to the general registers of the machine,
 116    and some are "phony" register numbers which are too large
 117    to be actual register numbers as far as the user is concerned
 118    but do serve to get the desired values when passed to read_register.  */
 119
 120 #define FP0_REGNUM 8            /* Floating point register 0 */
 121 #define SP_REGNUM 16            /* Contains address of top of stack */
 122 #define AP_REGNUM FP_REGNUM
 123 #define FP_REGNUM 17            /* Contains address of executing stack frame */
 124 #define PC_REGNUM 18            /* Contains program counter */
 125 #define PS_REGNUM 19            /* Contains processor status */
 126 #define FPS_REGNUM 20           /* Floating point status register */
 127 #define LP0_REGNUM 21           /* Double register 0 (same as FP0) */
 128
 129 /* Total amount of space needed to store our copies of the machine's
 130    register state, the array `registers'.  */
 131 #define REGISTER_BYTES ((NUM_REGS - 4) * sizeof (int) + 4 * sizeof (double))
 132
 133 /* Index within `registers' of the first byte of the space for
 134    register N.  */
 135
 136 #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
 137         LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
 138
 139 /* Number of bytes of storage in the actual machine representation
 140    for register N.  On the 32000, all regs are 4 bytes
 141    except for the doubled floating registers. */
 142
 143 #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 144
 145 /* Number of bytes of storage in the program's representation
 146    for register N.  On the 32000, all regs are 4 bytes
 147    except for the doubled floating registers. */
 148
 149 #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 150
 151 /* Largest value REGISTER_RAW_SIZE can have.  */
 152
 153 #define MAX_REGISTER_RAW_SIZE 8
 154
 155 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 156
 157 #define MAX_REGISTER_VIRTUAL_SIZE 8
 158
 159 /* Nonzero if register N requires conversion
 160    from raw format to virtual format.  */
 161
 162 #define REGISTER_CONVERTIBLE(N) 0
 163
 164 /* Convert data from raw format for register REGNUM
 165    to virtual format for register REGNUM.  */
 166
 167 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 168   bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
 169
 170 /* Convert data from virtual format for register REGNUM
 171    to raw format for register REGNUM.  */
 172
 173 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 174   bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
 175
 176 /* Return the GDB type object for the "standard" data type
 177    of data in register N.  */
 178
 179 #define REGISTER_VIRTUAL_TYPE(N) \
 180         (((N) < FP0_REGNUM) ?                           \
 181                 builtin_type_int :                      \
 182                 ((N) < FP0_REGNUM + 8) ?                \
 183                         builtin_type_float :            \
 184                         ((N) < LP0_REGNUM) ?            \
 185                                 builtin_type_int :      \
 186                                 builtin_type_double)
 187
 188 /* Store the address of the place in which to copy the structure the
 189    subroutine will return.  This is called from call_function.
 190
 191    On this machine this is a no-op, because gcc isn't used on it
 192    yet.  So this calling convention is not used. */
 193
 194 #define STORE_STRUCT_RETURN(ADDR, SP)
 195
 196 /* Extract from an array REGBUF containing the (raw) register state
 197    a function return value of type TYPE, and copy that, in virtual format,
 198    into VALBUF.  */
 199
 200 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 201   bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
 202
 203 /* Write into appropriate registers a function return value
 204    of type TYPE, given in virtual format.  */
 205
 206 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 207   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
 208
 209 /* Extract from an array REGBUF containing the (raw) register state
 210    the address in which a function should return its structure value,
 211    as a CORE_ADDR (or an expression that can be used as one).  */
 212
 213 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 214 \f
 215 /* Describe the pointer in each stack frame to the previous stack frame
 216    (its caller).  */
 217
 218 /* FRAME_CHAIN takes a frame's nominal address
 219    and produces the frame's chain-pointer.
 220
 221    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 222    and produces the nominal address of the caller frame.
 223
 224    However, if FRAME_CHAIN_VALID returns zero,
 225    it means the given frame is the outermost one and has no caller.
 226    In that case, FRAME_CHAIN_COMBINE is not used.  */
 227
 228 /* In the case of the ns32000 series, the frame's nominal address is the FP
 229    value, and at that address is saved previous FP value as a 4-byte word.  */
 230
 231 #define FRAME_CHAIN(thisframe)  \
 232   (outside_startup_file ((thisframe)->pc) ? \
 233    read_memory_integer ((thisframe)->frame, 4) :\
 234    0)
 235
 236 #define FRAME_CHAIN_VALID(chain, thisframe) \
 237   (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
 238
 239 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 240
 241 /* Define other aspects of the stack frame.  */
 242
 243 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 244
 245 /* Compute base of arguments. */
 246
 247 #define FRAME_ARGS_ADDRESS(fi)  \
 248   ((ns32k_get_enter_addr ((fi)->pc) > 1) ? \
 249         ((fi)->frame) : (read_register (SP_REGNUM) - 4))
 250
 251 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 252
 253 /* Get the address of the enter opcode for this function, if it is active.
 254    Returns positive address > 1 if pc is between enter/exit,
 255    1 if pc before enter or after exit, 0 otherwise. */
 256
 257 #ifndef CORE_ADDR
 258 #include "defs.h"   /* Make sure CORE_ADDR is defined.  */
 259 #endif
 260
 261 extern CORE_ADDR ns32k_get_enter_addr ();
 262
 263 /* Return number of args passed to a frame.
 264    Can return -1, meaning no way to tell.
 265    Encore's C compiler often reuses same area on stack for args,
 266    so this will often not work properly.  If the arg names
 267    are known, it's likely most of them will be printed. */
 268
 269 #define FRAME_NUM_ARGS(numargs, fi)                     \
 270 { CORE_ADDR     pc;                                     \
 271   CORE_ADDR     enter_addr;                             \
 272   unsigned int  insn;                                   \
 273   unsigned int  addr_mode;                              \
 274   int width;                                            \
 275                                                         \
 276   numargs = -1;                                         \
 277   enter_addr = ns32k_get_enter_addr ((fi)->pc);         \
 278   if (enter_addr > 0)                                   \
 279     {                                                   \
 280       pc = (enter_addr == 1) ?                          \
 281         SAVED_PC_AFTER_CALL (fi) :                      \
 282         FRAME_SAVED_PC (fi);                            \
 283       insn = read_memory_integer (pc,2);                \
 284       addr_mode = (insn >> 11) & 0x1f;                  \
 285       insn = insn & 0x7ff;                              \
 286       if ((insn & 0x7fc) == 0x57c &&                    \
 287                 addr_mode == 0x14) /* immediate */      \
 288         {                                               \
 289           if (insn == 0x57c) /* adjspb */               \
 290                 width = 1;                              \
 291           else if (insn == 0x57d) /* adjspw */          \
 292                 width = 2;                              \
 293           else if (insn == 0x57f) /* adjspd */          \
 294                 width = 4;                              \
 295           numargs = read_memory_integer (pc+2,width);   \
 296           if (width > 1)                                \
 297             flip_bytes (&numargs, width);               \
 298           numargs = - sign_extend (numargs, width*8) / 4;\
 299         }                                               \
 300     }                                                   \
 301 }
 302
 303 /* Return number of bytes at start of arglist that are not really args.  */
 304
 305 #define FRAME_ARGS_SKIP 8
 306
 307 /* Put here the code to store, into a struct frame_saved_regs,
 308    the addresses of the saved registers of frame described by FRAME_INFO.
 309    This includes special registers such as pc and fp saved in special
 310    ways in the stack frame.  sp is even more special:
 311    the address we return for it IS the sp for the next frame.  */
 312
 313 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)     \
 314 {                                                               \
 315   register int  regmask, regnum;                                \
 316   int           localcount;                                     \
 317   register CORE_ADDR    enter_addr;                             \
 318   register CORE_ADDR    next_addr;                              \
 319                                                                 \
 320   bzero (&(frame_saved_regs), sizeof (frame_saved_regs));       \
 321   enter_addr = ns32k_get_enter_addr ((frame_info)->pc);         \
 322   if (enter_addr > 1)                                           \
 323     {                                                           \
 324       regmask = read_memory_integer (enter_addr+1, 1) & 0xff;   \
 325       localcount = ns32k_localcount (enter_addr);               \
 326       next_addr = (frame_info)->frame + localcount;             \
 327       for (regnum = 0; regnum < 8; regnum++, regmask >>= 1)     \
 328         (frame_saved_regs).regs[regnum] = (regmask & 1) ?       \
 329                                           (next_addr -= 4) : 0; \
 330       (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;\
 331       (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;\
 332       (frame_saved_regs).regs[FP_REGNUM] =                      \
 333                   (read_memory_integer ((frame_info)->frame, 4));\
 334     }                                                           \
 335   else if (enter_addr == 1)                                     \
 336     {                                                           \
 337       CORE_ADDR sp = read_register (SP_REGNUM);                 \
 338       (frame_saved_regs).regs[PC_REGNUM] = sp;                  \
 339       (frame_saved_regs).regs[SP_REGNUM] = sp + 4;              \
 340     }                                                           \
 341 }
 342 \f
 343 /* Things needed for making the inferior call functions.  */
 344
 345 /* Push an empty stack frame, to record the current PC, etc.  */
 346
 347 #define PUSH_DUMMY_FRAME \
 348 { register CORE_ADDR sp = read_register (SP_REGNUM);\
 349   register int regnum;                              \
 350   sp = push_word (sp, read_register (PC_REGNUM));   \
 351   sp = push_word (sp, read_register (FP_REGNUM));   \
 352   write_register (FP_REGNUM, sp);                   \
 353   for (regnum = 0; regnum < 8; regnum++)  \
 354     sp = push_word (sp, read_register (regnum));    \
 355   write_register (SP_REGNUM, sp);                       \
 356 }
 357
 358 /* Discard from the stack the innermost frame, restoring all registers.  */
 359
 360 #define POP_FRAME  \
 361 { register FRAME frame = get_current_frame ();                   \
 362   register CORE_ADDR fp;                                         \
 363   register int regnum;                                           \
 364   struct frame_saved_regs fsr;                                   \
 365   struct frame_info *fi;                                                 \
 366   fi = get_frame_info (frame);                                   \
 367   fp = fi->frame;                                                \
 368   get_frame_saved_regs (fi, &fsr);                               \
 369   for (regnum = 0; regnum < 8; regnum++)                         \
 370     if (fsr.regs[regnum])                                        \
 371       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
 372   write_register (FP_REGNUM, read_memory_integer (fp, 4));       \
 373   write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));   \
 374   write_register (SP_REGNUM, fp + 8);                            \
 375   flush_cached_frames ();                                        \
 376   set_current_frame (create_new_frame (read_register (FP_REGNUM),\
 377                                        read_pc ())); }
 378
 379 /* This sequence of words is the instructions
 380      enter      0xff,0          82 ff 00
 381      jsr        @0x00010203     7f ae c0 01 02 03
 382      adjspd     0x69696969      7f a5 01 02 03 04
 383      bpt                        f2
 384    Note this is 16 bytes.  */
 385
 386 #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
 387
 388 #define CALL_DUMMY_START_OFFSET 3
 389 #define CALL_DUMMY_LENGTH       16
 390 #define CALL_DUMMY_ADDR         5
 391 #define CALL_DUMMY_NARGS        11
 392
 393 /* Insert the specified number of args and function address
 394    into a call sequence of the above form stored at DUMMYNAME.  */
 395
 396 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)            \
 397 {                                                               \
 398         int     flipped;                                        \
 399         flipped = fun | 0xc0000000;                             \
 400         flip_bytes (&flipped, 4);                               \
 401         *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped;    \
 402         flipped = - nargs * 4;                                  \
 403         flip_bytes (&flipped, 4);                               \
 404         *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped;   \
 405 }