gdb/config/ns32k/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 /* This is also included by tm-ns32km3.h, as well as being used by umax.  */
  21
  22 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
  23
  24 /* Need to get function ends by adding this to epilogue address from .bf
  25    record, not using x_fsize field.  */
  26 #define FUNCTION_EPILOGUE_SIZE 4
  27
  28 /* Offset from address of function to start of its code.
  29    Zero on most machines.  */
  30
  31 #define FUNCTION_START_OFFSET 0
  32
  33 /* Advance PC across any function entry prologue instructions
  34    to reach some "real" code.  */
  35
  36 #define SKIP_PROLOGUE(pc)                               \
  37 { register unsigned char op = read_memory_integer (pc, 1);      \
  38   if (op == 0x82) { op = read_memory_integer (pc+2,1);  \
  39                     if ((op & 0x80) == 0) pc += 3;      \
  40                     else if ((op & 0xc0) == 0x80) pc += 4;      \
  41                     else pc += 6;                       \
  42                    }                                    \
  43 }
  44
  45 /* Immediately after a function call, return the saved pc.
  46    Can't always go through the frames for this because on some machines
  47    the new frame is not set up until the new function executes
  48    some instructions.  */
  49
  50 #define SAVED_PC_AFTER_CALL(frame) \
  51         read_memory_integer (read_register (SP_REGNUM), 4)
  52
  53 /* Address of end of stack space.  */
  54
  55 #ifndef STACK_END_ADDR
  56 #define STACK_END_ADDR (0xfffff000)
  57 #endif
  58
  59 /* Stack grows downward.  */
  60
  61 #define INNER_THAN <
  62
  63 /* Sequence of bytes for breakpoint instruction.  */
  64
  65 #define BREAKPOINT {0xf2}
  66
  67 /* Amount PC must be decremented by after a breakpoint.
  68    This is often the number of bytes in BREAKPOINT
  69    but not always.  */
  70
  71 #define DECR_PC_AFTER_BREAK 0
  72
  73 /* Nonzero if instruction at PC is a return instruction.  */
  74
  75 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x12)
  76
  77 #if 0 /* Disable until fixed *correctly*.  */
  78 #ifndef INVALID_FLOAT
  79 #ifndef NaN
  80 #include <nan.h>
  81 #endif NaN
  82
  83 /* Return 1 if P points to an invalid floating point value.  */
  84 /* Surely wrong for cross-debugging.  */
  85 #define INVALID_FLOAT(p, s) \
  86          ((s == sizeof (float))?        \
  87                 NaF (*(float *) p) :    \
  88                 NaD (*(double *) p))
  89 #endif /* INVALID_FLOAT */
  90 #endif
  91
  92 /* Say how long (ordinary) registers are.  This is a piece of bogosity
  93    used in push_word and a few other places; REGISTER_RAW_SIZE is the
  94    real way to know how big a register is.  */
  95
  96 #define REGISTER_SIZE 4
  97
  98 /* Number of machine registers */
  99
 100 #define NUM_REGS                25
 101
 102 #define NUM_GENERAL_REGS        8
 103
 104 /* Initializer for an array of names of registers.
 105    There should be NUM_REGS strings in this initializer.  */
 106
 107 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
 108                         "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
 109                         "sp", "fp", "pc", "ps",                         \
 110                         "fsr",                                          \
 111                         "l0", "l1", "l2", "l3", "xx",                   \
 112                         }
 113
 114 /* Register numbers of various important registers.
 115    Note that some of these values are "real" register numbers,
 116    and correspond to the general registers of the machine,
 117    and some are "phony" register numbers which are too large
 118    to be actual register numbers as far as the user is concerned
 119    but do serve to get the desired values when passed to read_register.  */
 120
 121 #define R0_REGNUM 0             /* General register 0 */
 122 #define FP0_REGNUM 8            /* Floating point register 0 */
 123 #define SP_REGNUM 16            /* Contains address of top of stack */
 124 #define AP_REGNUM FP_REGNUM
 125 #define FP_REGNUM 17            /* Contains address of executing stack frame */
 126 #define PC_REGNUM 18            /* Contains program counter */
 127 #define PS_REGNUM 19            /* Contains processor status */
 128 #define FPS_REGNUM 20           /* Floating point status register */
 129 #define LP0_REGNUM 21           /* Double register 0 (same as FP0) */
 130
 131 /* Total amount of space needed to store our copies of the machine's
 132    register state, the array `registers'.  */
 133 #define REGISTER_BYTES \
 134   ((NUM_REGS - 4) * REGISTER_RAW_SIZE(R0_REGNUM) \
 135    + 4            * REGISTER_RAW_SIZE(LP0_REGNUM))
 136
 137 /* Index within `registers' of the first byte of the space for
 138    register N.  */
 139
 140 #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
 141         LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
 142
 143 /* Number of bytes of storage in the actual machine representation
 144    for register N.  On the 32000, all regs are 4 bytes
 145    except for the doubled floating registers. */
 146
 147 #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 148
 149 /* Number of bytes of storage in the program's representation
 150    for register N.  On the 32000, all regs are 4 bytes
 151    except for the doubled floating registers. */
 152
 153 #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 154
 155 /* Largest value REGISTER_RAW_SIZE can have.  */
 156
 157 #define MAX_REGISTER_RAW_SIZE 8
 158
 159 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 160
 161 #define MAX_REGISTER_VIRTUAL_SIZE 8
 162
 163 /* Return the GDB type object for the "standard" data type
 164    of data in register N.  */
 165
 166 #define REGISTER_VIRTUAL_TYPE(N) \
 167         (((N) < FP0_REGNUM) ?                           \
 168                 builtin_type_int :                      \
 169                 ((N) < FP0_REGNUM + 8) ?                \
 170                         builtin_type_float :            \
 171                         ((N) < LP0_REGNUM) ?            \
 172                                 builtin_type_int :      \
 173                                 builtin_type_double)
 174
 175 /* Store the address of the place in which to copy the structure the
 176    subroutine will return.  This is called from call_function.
 177
 178    On this machine this is a no-op, because gcc isn't used on it
 179    yet.  So this calling convention is not used. */
 180
 181 #define STORE_STRUCT_RETURN(ADDR, SP)
 182
 183 /* Extract from an array REGBUF containing the (raw) register state
 184    a function return value of type TYPE, and copy that, in virtual format,
 185    into VALBUF.  */
 186
 187 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 188   memcpy (VALBUF, REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), TYPE_LENGTH (TYPE))
 189
 190 /* Write into appropriate registers a function return value
 191    of type TYPE, given in virtual format.  */
 192
 193 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 194   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
 195
 196 /* Extract from an array REGBUF containing the (raw) register state
 197    the address in which a function should return its structure value,
 198    as a CORE_ADDR (or an expression that can be used as one).  */
 199
 200 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 201 \f
 202 /* Describe the pointer in each stack frame to the previous stack frame
 203    (its caller).  */
 204
 205 /* FRAME_CHAIN takes a frame's nominal address
 206    and produces the frame's chain-pointer. */
 207
 208 /* In the case of the ns32000 series, the frame's nominal address is the FP
 209    value, and at that address is saved previous FP value as a 4-byte word.  */
 210
 211 #define FRAME_CHAIN(thisframe)  \
 212   (!inside_entry_file ((thisframe)->pc) ? \
 213    read_memory_integer ((thisframe)->frame, 4) :\
 214    0)
 215
 216 /* Define other aspects of the stack frame.  */
 217
 218 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 219
 220 /* Compute base of arguments. */
 221
 222 #define FRAME_ARGS_ADDRESS(fi)  \
 223   ((ns32k_get_enter_addr ((fi)->pc) > 1) ? \
 224         ((fi)->frame) : (read_register (SP_REGNUM) - 4))
 225
 226 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 227
 228 /* Get the address of the enter opcode for this function, if it is active.
 229    Returns positive address > 1 if pc is between enter/exit,
 230    1 if pc before enter or after exit, 0 otherwise. */
 231
 232 extern CORE_ADDR ns32k_get_enter_addr ();
 233
 234 /* Return number of args passed to a frame.
 235    Can return -1, meaning no way to tell.
 236    Encore's C compiler often reuses same area on stack for args,
 237    so this will often not work properly.  If the arg names
 238    are known, it's likely most of them will be printed. */
 239
 240 #define FRAME_NUM_ARGS(numargs, fi)                     \
 241 { CORE_ADDR     pc;                                     \
 242   CORE_ADDR     enter_addr;                             \
 243   unsigned int  insn;                                   \
 244   unsigned int  addr_mode;                              \
 245   int width;                                            \
 246                                                         \
 247   numargs = -1;                                         \
 248   enter_addr = ns32k_get_enter_addr ((fi)->pc);         \
 249   if (enter_addr > 0)                                   \
 250     {                                                   \
 251       pc = (enter_addr == 1) ?                          \
 252         SAVED_PC_AFTER_CALL (fi) :                      \
 253         FRAME_SAVED_PC (fi);                            \
 254       insn = read_memory_integer (pc,2);                \
 255       addr_mode = (insn >> 11) & 0x1f;                  \
 256       insn = insn & 0x7ff;                              \
 257       if ((insn & 0x7fc) == 0x57c &&                    \
 258                 addr_mode == 0x14) /* immediate */      \
 259         {                                               \
 260           if (insn == 0x57c) /* adjspb */               \
 261                 width = 1;                              \
 262           else if (insn == 0x57d) /* adjspw */          \
 263                 width = 2;                              \
 264           else if (insn == 0x57f) /* adjspd */          \
 265                 width = 4;                              \
 266           numargs = read_memory_integer (pc+2,width);   \
 267           if (width > 1)                                \
 268             flip_bytes (&numargs, width);               \
 269           numargs = - sign_extend (numargs, width*8) / 4;\
 270         }                                               \
 271     }                                                   \
 272 }
 273
 274 /* Return number of bytes at start of arglist that are not really args.  */
 275
 276 #define FRAME_ARGS_SKIP 8
 277
 278 /* Put here the code to store, into a struct frame_saved_regs,
 279    the addresses of the saved registers of frame described by FRAME_INFO.
 280    This includes special registers such as pc and fp saved in special
 281    ways in the stack frame.  sp is even more special:
 282    the address we return for it IS the sp for the next frame.  */
 283
 284 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)     \
 285 {                                                               \
 286   register int  regmask, regnum;                                \
 287   int           localcount;                                     \
 288   register CORE_ADDR    enter_addr;                             \
 289   register CORE_ADDR    next_addr;                              \
 290                                                                 \
 291   memset (&(frame_saved_regs), '\0', sizeof (frame_saved_regs));        \
 292   enter_addr = ns32k_get_enter_addr ((frame_info)->pc);         \
 293   if (enter_addr > 1)                                           \
 294     {                                                           \
 295       regmask = read_memory_integer (enter_addr+1, 1) & 0xff;   \
 296       localcount = ns32k_localcount (enter_addr);               \
 297       next_addr = (frame_info)->frame + localcount;             \
 298       for (regnum = 0; regnum < 8; regnum++, regmask >>= 1)     \
 299         (frame_saved_regs).regs[regnum] = (regmask & 1) ?       \
 300                                           (next_addr -= 4) : 0; \
 301       (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;\
 302       (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;\
 303       (frame_saved_regs).regs[FP_REGNUM] =                      \
 304                   (read_memory_integer ((frame_info)->frame, 4));\
 305     }                                                           \
 306   else if (enter_addr == 1)                                     \
 307     {                                                           \
 308       CORE_ADDR sp = read_register (SP_REGNUM);                 \
 309       (frame_saved_regs).regs[PC_REGNUM] = sp;                  \
 310       (frame_saved_regs).regs[SP_REGNUM] = sp + 4;              \
 311     }                                                           \
 312 }
 313 \f
 314 /* Things needed for making the inferior call functions.  */
 315
 316 /* Push an empty stack frame, to record the current PC, etc.  */
 317
 318 #define PUSH_DUMMY_FRAME \
 319 { register CORE_ADDR sp = read_register (SP_REGNUM);\
 320   register int regnum;                              \
 321   sp = push_word (sp, read_register (PC_REGNUM));   \
 322   sp = push_word (sp, read_register (FP_REGNUM));   \
 323   write_register (FP_REGNUM, sp);                   \
 324   for (regnum = 0; regnum < 8; regnum++)  \
 325     sp = push_word (sp, read_register (regnum));    \
 326   write_register (SP_REGNUM, sp);                       \
 327 }
 328
 329 /* Discard from the stack the innermost frame, restoring all registers.  */
 330
 331 #define POP_FRAME  \
 332 { register struct frame_info *frame = get_current_frame ();      \
 333   register CORE_ADDR fp;                                         \
 334   register int regnum;                                           \
 335   struct frame_saved_regs fsr;                                   \
 336   struct frame_info *fi;                                                 \
 337   fp = frame->frame;                                             \
 338   get_frame_saved_regs (frame, &fsr);                            \
 339   for (regnum = 0; regnum < 8; regnum++)                         \
 340     if (fsr.regs[regnum])                                        \
 341       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
 342   write_register (FP_REGNUM, read_memory_integer (fp, 4));       \
 343   write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));   \
 344   write_register (SP_REGNUM, fp + 8);                            \
 345   flush_cached_frames ();                                        \
 346 }
 347
 348 /* This sequence of words is the instructions
 349      enter      0xff,0          82 ff 00
 350      jsr        @0x00010203     7f ae c0 01 02 03
 351      adjspd     0x69696969      7f a5 01 02 03 04
 352      bpt                        f2
 353    Note this is 16 bytes.  */
 354
 355 #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
 356
 357 #define CALL_DUMMY_START_OFFSET 3
 358 #define CALL_DUMMY_LENGTH       16
 359 #define CALL_DUMMY_ADDR         5
 360 #define CALL_DUMMY_NARGS        11
 361
 362 /* Insert the specified number of args and function address
 363    into a call sequence of the above form stored at DUMMYNAME.  */
 364
 365 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)            \
 366 {                                                               \
 367         int     flipped;                                        \
 368         flipped = fun | 0xc0000000;                             \
 369         flip_bytes (&flipped, 4);                               \
 370         *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped;    \
 371         flipped = - nargs * 4;                                  \
 372         flip_bytes (&flipped, 4);                               \
 373         *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped;   \
 374 }