gdb/tm-umax.h

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