gdb/tm-umax.h

   1 /* Definitions to make GDB run on an encore under umax 4.2
   2    Copyright 1987, 1989, 1991, 1993 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 /* Need to get function ends by adding this to epilogue address from .bf
  23    record, not using x_fsize field.  */
  24 #define FUNCTION_EPILOGUE_SIZE 4
  25
  26 /* Offset from address of function to start of its code.
  27    Zero on most machines.  */
  28
  29 #define FUNCTION_START_OFFSET 0
  30
  31 /* Advance PC across any function entry prologue instructions
  32    to reach some "real" code.  */
  33
  34 #define SKIP_PROLOGUE(pc)                               \
  35 { register unsigned char op = read_memory_integer (pc, 1);      \
  36   if (op == 0x82) { op = read_memory_integer (pc+2,1);  \
  37                     if ((op & 0x80) == 0) pc += 3;      \
  38                     else if ((op & 0xc0) == 0x80) pc += 4;      \
  39                     else pc += 6;                       \
  40                    }                                    \
  41 }
  42
  43 /* Immediately after a function call, return the saved pc.
  44    Can't always go through the frames for this because on some machines
  45    the new frame is not set up until the new function executes
  46    some instructions.  */
  47
  48 #define SAVED_PC_AFTER_CALL(frame) \
  49         read_memory_integer (read_register (SP_REGNUM), 4)
  50
  51 /* Address of end of stack space.  */
  52
  53 #define STACK_END_ADDR (0xfffff000)
  54
  55 /* Stack grows downward.  */
  56
  57 #define INNER_THAN <
  58
  59 /* Sequence of bytes for breakpoint instruction.  */
  60
  61 #define BREAKPOINT {0xf2}
  62
  63 /* Amount PC must be decremented by after a breakpoint.
  64    This is often the number of bytes in BREAKPOINT
  65    but not always.  */
  66
  67 #define DECR_PC_AFTER_BREAK 0
  68
  69 /* Nonzero if instruction at PC is a return instruction.  */
  70
  71 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x12)
  72
  73 #ifndef NaN
  74 #include <nan.h>
  75 #endif NaN
  76
  77 /* Return 1 if P points to an invalid floating point value.  */
  78 /* Surely wrong for cross-debugging.  */
  79 #define INVALID_FLOAT(p, s) \
  80          ((s == sizeof (float))?        \
  81                 NaF (*(float *) p) :    \
  82                 NaD (*(double *) p))
  83
  84 /* Say how long (ordinary) registers are.  */
  85
  86 #define REGISTER_TYPE long
  87
  88 /* Number of machine registers */
  89
  90 #define NUM_REGS                25
  91
  92 #define NUM_GENERAL_REGS        8
  93
  94 /* Initializer for an array of names of registers.
  95    There should be NUM_REGS strings in this initializer.  */
  96
  97 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
  98                         "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
  99                         "sp", "fp", "pc", "ps",                         \
 100                         "fsr",                                          \
 101                         "l0", "l1", "l2", "l3", "xx",                   \
 102                         }
 103
 104 /* Register numbers of various important registers.
 105    Note that some of these values are "real" register numbers,
 106    and correspond to the general registers of the machine,
 107    and some are "phony" register numbers which are too large
 108    to be actual register numbers as far as the user is concerned
 109    but do serve to get the desired values when passed to read_register.  */
 110
 111 #define R0_REGNUM 0             /* General register 0 */
 112 #define FP0_REGNUM 8            /* Floating point register 0 */
 113 #define SP_REGNUM 16            /* Contains address of top of stack */
 114 #define AP_REGNUM FP_REGNUM
 115 #define FP_REGNUM 17            /* Contains address of executing stack frame */
 116 #define PC_REGNUM 18            /* Contains program counter */
 117 #define PS_REGNUM 19            /* Contains processor status */
 118 #define FPS_REGNUM 20           /* Floating point status register */
 119 #define LP0_REGNUM 21           /* Double register 0 (same as FP0) */
 120
 121 /* Total amount of space needed to store our copies of the machine's
 122    register state, the array `registers'.  */
 123 #define REGISTER_BYTES \
 124   ((NUM_REGS - 4) * REGISTER_RAW_SIZE(R0_REGNUM) \
 125    + 4            * REGISTER_RAW_SIZE(LP0_REGNUM))
 126
 127 /* Index within `registers' of the first byte of the space for
 128    register N.  */
 129
 130 #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
 131         LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
 132
 133 /* Number of bytes of storage in the actual machine representation
 134    for register N.  On the 32000, all regs are 4 bytes
 135    except for the doubled floating registers. */
 136
 137 #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 138
 139 /* Number of bytes of storage in the program's representation
 140    for register N.  On the 32000, all regs are 4 bytes
 141    except for the doubled floating registers. */
 142
 143 #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 144
 145 /* Largest value REGISTER_RAW_SIZE can have.  */
 146
 147 #define MAX_REGISTER_RAW_SIZE 8
 148
 149 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 150
 151 #define MAX_REGISTER_VIRTUAL_SIZE 8
 152
 153 /* Nonzero if register N requires conversion
 154    from raw format to virtual format.  */
 155
 156 #define REGISTER_CONVERTIBLE(N) 0
 157
 158 /* Convert data from raw format for register REGNUM
 159    to virtual format for register REGNUM.  */
 160
 161 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 162   bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
 163
 164 /* Convert data from virtual format for register REGNUM
 165    to raw format for register REGNUM.  */
 166
 167 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 168   bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
 169
 170 /* Return the GDB type object for the "standard" data type
 171    of data in register N.  */
 172
 173 #define REGISTER_VIRTUAL_TYPE(N) \
 174         (((N) < FP0_REGNUM) ?                           \
 175                 builtin_type_int :                      \
 176                 ((N) < FP0_REGNUM + 8) ?                \
 177                         builtin_type_float :            \
 178                         ((N) < LP0_REGNUM) ?            \
 179                                 builtin_type_int :      \
 180                                 builtin_type_double)
 181
 182 /* Store the address of the place in which to copy the structure the
 183    subroutine will return.  This is called from call_function.
 184
 185    On this machine this is a no-op, because gcc isn't used on it
 186    yet.  So this calling convention is not used. */
 187
 188 #define STORE_STRUCT_RETURN(ADDR, SP)
 189
 190 /* Extract from an array REGBUF containing the (raw) register state
 191    a function return value of type TYPE, and copy that, in virtual format,
 192    into VALBUF.  */
 193
 194 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 195   bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
 196
 197 /* Write into appropriate registers a function return value
 198    of type TYPE, given in virtual format.  */
 199
 200 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 201   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
 202
 203 /* Extract from an array REGBUF containing the (raw) register state
 204    the address in which a function should return its structure value,
 205    as a CORE_ADDR (or an expression that can be used as one).  */
 206
 207 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 208 \f
 209 /* Describe the pointer in each stack frame to the previous stack frame
 210    (its caller).  */
 211
 212 /* FRAME_CHAIN takes a frame's nominal address
 213    and produces the frame's chain-pointer. */
 214
 215 /* In the case of the ns32000 series, the frame's nominal address is the FP
 216    value, and at that address is saved previous FP value as a 4-byte word.  */
 217
 218 #define FRAME_CHAIN(thisframe)  \
 219   (!inside_entry_file ((thisframe)->pc) ? \
 220    read_memory_integer ((thisframe)->frame, 4) :\
 221    0)
 222
 223 /* Define other aspects of the stack frame.  */
 224
 225 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 226
 227 /* Compute base of arguments. */
 228
 229 #define FRAME_ARGS_ADDRESS(fi)  \
 230   ((ns32k_get_enter_addr ((fi)->pc) > 1) ? \
 231         ((fi)->frame) : (read_register (SP_REGNUM) - 4))
 232
 233 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 234
 235 /* Get the address of the enter opcode for this function, if it is active.
 236    Returns positive address > 1 if pc is between enter/exit,
 237    1 if pc before enter or after exit, 0 otherwise. */
 238
 239 extern CORE_ADDR ns32k_get_enter_addr ();
 240
 241 /* Return number of args passed to a frame.
 242    Can return -1, meaning no way to tell.
 243    Encore's C compiler often reuses same area on stack for args,
 244    so this will often not work properly.  If the arg names
 245    are known, it's likely most of them will be printed. */
 246
 247 #define FRAME_NUM_ARGS(numargs, fi)                     \
 248 { CORE_ADDR     pc;                                     \
 249   CORE_ADDR     enter_addr;                             \
 250   unsigned int  insn;                                   \
 251   unsigned int  addr_mode;                              \
 252   int width;                                            \
 253                                                         \
 254   numargs = -1;                                         \
 255   enter_addr = ns32k_get_enter_addr ((fi)->pc);         \
 256   if (enter_addr > 0)                                   \
 257     {                                                   \
 258       pc = (enter_addr == 1) ?                          \
 259         SAVED_PC_AFTER_CALL (fi) :                      \
 260         FRAME_SAVED_PC (fi);                            \
 261       insn = read_memory_integer (pc,2);                \
 262       addr_mode = (insn >> 11) & 0x1f;                  \
 263       insn = insn & 0x7ff;                              \
 264       if ((insn & 0x7fc) == 0x57c &&                    \
 265                 addr_mode == 0x14) /* immediate */      \
 266         {                                               \
 267           if (insn == 0x57c) /* adjspb */               \
 268                 width = 1;                              \
 269           else if (insn == 0x57d) /* adjspw */          \
 270                 width = 2;                              \
 271           else if (insn == 0x57f) /* adjspd */          \
 272                 width = 4;                              \
 273           numargs = read_memory_integer (pc+2,width);   \
 274           if (width > 1)                                \
 275             flip_bytes (&numargs, width);               \
 276           numargs = - sign_extend (numargs, width*8) / 4;\
 277         }                                               \
 278     }                                                   \
 279 }
 280
 281 /* Return number of bytes at start of arglist that are not really args.  */
 282
 283 #define FRAME_ARGS_SKIP 8
 284
 285 /* Put here the code to store, into a struct frame_saved_regs,
 286    the addresses of the saved registers of frame described by FRAME_INFO.
 287    This includes special registers such as pc and fp saved in special
 288    ways in the stack frame.  sp is even more special:
 289    the address we return for it IS the sp for the next frame.  */
 290
 291 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)     \
 292 {                                                               \
 293   register int  regmask, regnum;                                \
 294   int           localcount;                                     \
 295   register CORE_ADDR    enter_addr;                             \
 296   register CORE_ADDR    next_addr;                              \
 297                                                                 \
 298   bzero (&(frame_saved_regs), sizeof (frame_saved_regs));       \
 299   enter_addr = ns32k_get_enter_addr ((frame_info)->pc);         \
 300   if (enter_addr > 1)                                           \
 301     {                                                           \
 302       regmask = read_memory_integer (enter_addr+1, 1) & 0xff;   \
 303       localcount = ns32k_localcount (enter_addr);               \
 304       next_addr = (frame_info)->frame + localcount;             \
 305       for (regnum = 0; regnum < 8; regnum++, regmask >>= 1)     \
 306         (frame_saved_regs).regs[regnum] = (regmask & 1) ?       \
 307                                           (next_addr -= 4) : 0; \
 308       (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;\
 309       (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;\
 310       (frame_saved_regs).regs[FP_REGNUM] =                      \
 311                   (read_memory_integer ((frame_info)->frame, 4));\
 312     }                                                           \
 313   else if (enter_addr == 1)                                     \
 314     {                                                           \
 315       CORE_ADDR sp = read_register (SP_REGNUM);                 \
 316       (frame_saved_regs).regs[PC_REGNUM] = sp;                  \
 317       (frame_saved_regs).regs[SP_REGNUM] = sp + 4;              \
 318     }                                                           \
 319 }
 320 \f
 321 /* Things needed for making the inferior call functions.  */
 322
 323 /* Push an empty stack frame, to record the current PC, etc.  */
 324
 325 #define PUSH_DUMMY_FRAME \
 326 { register CORE_ADDR sp = read_register (SP_REGNUM);\
 327   register int regnum;                              \
 328   sp = push_word (sp, read_register (PC_REGNUM));   \
 329   sp = push_word (sp, read_register (FP_REGNUM));   \
 330   write_register (FP_REGNUM, sp);                   \
 331   for (regnum = 0; regnum < 8; regnum++)  \
 332     sp = push_word (sp, read_register (regnum));    \
 333   write_register (SP_REGNUM, sp);                       \
 334 }
 335
 336 /* Discard from the stack the innermost frame, restoring all registers.  */
 337
 338 #define POP_FRAME  \
 339 { register FRAME frame = get_current_frame ();                   \
 340   register CORE_ADDR fp;                                         \
 341   register int regnum;                                           \
 342   struct frame_saved_regs fsr;                                   \
 343   struct frame_info *fi;                                                 \
 344   fi = get_frame_info (frame);                                   \
 345   fp = fi->frame;                                                \
 346   get_frame_saved_regs (fi, &fsr);                               \
 347   for (regnum = 0; regnum < 8; regnum++)                         \
 348     if (fsr.regs[regnum])                                        \
 349       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
 350   write_register (FP_REGNUM, read_memory_integer (fp, 4));       \
 351   write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));   \
 352   write_register (SP_REGNUM, fp + 8);                            \
 353   flush_cached_frames ();                                        \
 354   set_current_frame (create_new_frame (read_register (FP_REGNUM),\
 355                                        read_pc ())); }
 356
 357 /* This sequence of words is the instructions
 358      enter      0xff,0          82 ff 00
 359      jsr        @0x00010203     7f ae c0 01 02 03
 360      adjspd     0x69696969      7f a5 01 02 03 04
 361      bpt                        f2
 362    Note this is 16 bytes.  */
 363
 364 #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
 365
 366 #define CALL_DUMMY_START_OFFSET 3
 367 #define CALL_DUMMY_LENGTH       16
 368 #define CALL_DUMMY_ADDR         5
 369 #define CALL_DUMMY_NARGS        11
 370
 371 /* Insert the specified number of args and function address
 372    into a call sequence of the above form stored at DUMMYNAME.  */
 373
 374 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)            \
 375 {                                                               \
 376         int     flipped;                                        \
 377         flipped = fun | 0xc0000000;                             \
 378         flip_bytes (&flipped, 4);                               \
 379         *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped;    \
 380         flipped = - nargs * 4;                                  \
 381         flip_bytes (&flipped, 4);                               \
 382         *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped;   \
 383 }