gdb/tm-z8k.h

   1 /* Parameters for execution on a z8000 series machine.
   2    Copyright 1992, 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 IEEE_FLOAT 1
  21
  22 #undef TARGET_INT_BIT
  23 #undef TARGET_LONG_BIT
  24 #undef TARGET_SHORT_BIT
  25 #undef TARGET_PTR_BIT
  26
  27 #define TARGET_SHORT_BIT 16
  28 #define TARGET_INT_BIT 16
  29 #define TARGET_LONG_BIT 32
  30 #define TARGET_PTR_BIT (BIG ? 32: 16)
  31
  32 /* Define the bit, byte, and word ordering of the machine.  */
  33 #define TARGET_BYTE_ORDER BIG_ENDIAN
  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(ip)   {(ip) = z8k_skip_prologue(ip);}
  44 extern CORE_ADDR mz8k_skip_prologue PARAMS ((CORE_ADDR ip));
  45
  46
  47 /* Immediately after a function call, return the saved pc.
  48    Can't always go through the frames for this because on some machines
  49    the new frame is not set up until the new function executes
  50    some instructions.  */
  51
  52 #define SAVED_PC_AFTER_CALL(frame) saved_pc_after_call(frame)
  53
  54 /* Stack grows downward.  */
  55
  56 #define INNER_THAN <
  57
  58 /* Sequence of bytes for breakpoint instruction. */
  59
  60 #define BREAKPOINT {0x36,0x00}
  61
  62 /* If your kernel resets the pc after the trap happens you may need to
  63    define this before including this file.  */
  64
  65 #define DECR_PC_AFTER_BREAK 0
  66
  67 /* Nonzero if instruction at PC is a return instruction.  */
  68 /* Allow any of the return instructions, including a trapv and a return
  69    from interupt.  */
  70
  71 #define ABOUT_TO_RETURN(pc) about_to_return(pc)
  72
  73 /* Return 1 if P points to an invalid floating point value.  */
  74
  75 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
  76
  77 /* Say how long registers are.  */
  78
  79 #define REGISTER_TYPE unsigned int
  80
  81 #define NUM_REGS        23   /* 16 registers + 1 ccr + 1 pc + 3 debug
  82                                 regs + fake fp + fake sp*/
  83 #define REGISTER_BYTES  (NUM_REGS *4)
  84
  85 /* Index within `registers' of the first byte of the space for
  86    register N.  */
  87
  88 #define REGISTER_BYTE(N)  ((N)*4)
  89
  90 /* Number of bytes of storage in the actual machine representation
  91    for register N.  On the z8k, all but the pc are 2 bytes, but we
  92    keep them all as 4 bytes and trim them on I/O */
  93
  94
  95 #define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)
  96
  97 /* Number of bytes of storage in the program's representation
  98    for register N.  */
  99
 100 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
 101
 102 /* Largest value REGISTER_RAW_SIZE can have.  */
 103
 104 #define MAX_REGISTER_RAW_SIZE 4
 105
 106 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 107
 108 #define MAX_REGISTER_VIRTUAL_SIZE 4
 109
 110 /* Nonzero if register N requires conversion
 111    from raw format to virtual format.  */
 112
 113 #define REGISTER_CONVERTIBLE(N) 0
 114
 115 /* Convert data from raw format for register REGNUM
 116    to virtual format for register REGNUM.  */
 117
 118 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
 119  register_convert_to_virtual(REGNUM, FROM, TO)
 120
 121 /* Convert data from virtual format for register REGNUM
 122    to raw format for register REGNUM.  */
 123
 124 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 125  register_convert_to_raw(REGNUM, FROM, TO)
 126
 127 /* Return the GDB type object for the "standard" data type
 128    of data in register N.  */
 129
 130 #define REGISTER_VIRTUAL_TYPE(N) \
 131  (REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long)
 132
 133 /*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y)*/
 134 /* Initializer for an array of names of registers.
 135    Entries beyond the first NUM_REGS are ignored.  */
 136
 137 #define REGISTER_NAMES  \
 138  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
 139   "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
 140   "ccr", "pc", "cycles","insts","time","fp","sp"}
 141
 142 /* Register numbers of various important registers.
 143    Note that some of these values are "real" register numbers,
 144    and correspond to the general registers of the machine,
 145    and some are "phony" register numbers which are too large
 146    to be actual register numbers as far as the user is concerned
 147    but do serve to get the desired values when passed to read_register.  */
 148
 149 #define CCR_REGNUM      16      /* Contains processor status */
 150 #define PC_REGNUM       17      /* Contains program counter */
 151 #define CYCLES_REGNUM   18
 152 #define INSTS_REGNUM    19
 153 #define TIME_REGNUM     20
 154 #define FP_REGNUM       21      /* Contains fp, whatever memory model */
 155 #define SP_REGNUM       22      /* Conatins sp, whatever memory model */
 156
 157
 158
 159 #define PTR_SIZE (BIG ? 4: 2)
 160 #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
 161
 162 /* Store the address of the place in which to copy the structure the
 163    subroutine will return.  This is called from call_function. */
 164
 165 #define STORE_STRUCT_RETURN(ADDR, SP) abort();
 166
 167 /* Extract from an array REGBUF containing the (raw) register state
 168    a function return value of type TYPE, and copy that, in virtual format,
 169    into VALBUF.  This is assuming that floating point values are returned
 170    as doubles in d0/d1.  */
 171
 172
 173 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 174   bcopy(REGBUF + REGISTER_BYTE(2), VALBUF, TYPE_LENGTH(TYPE));
 175
 176 /* Write into appropriate registers a function return value
 177    of type TYPE, given in virtual format. */
 178
 179 #define STORE_RETURN_VALUE(TYPE,VALBUF) abort();
 180
 181 /* Extract from an array REGBUF containing the (raw) register state
 182    the address in which a function should return its structure value,
 183    as a CORE_ADDR (or an expression that can be used as one).  */
 184
 185 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 186 \f
 187 /* Describe the pointer in each stack frame to the previous stack frame
 188    (its caller).  */
 189
 190 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
 191    chain-pointer.
 192    In the case of the Z8000, the frame's nominal address
 193    is the address of a ptr sized byte word containing the calling
 194    frame's address.  */
 195
 196 #define FRAME_CHAIN(thisframe) frame_chain(thisframe);
 197
 198
 199
 200 /* Define other aspects of the stack frame.  */
 201
 202 /* A macro that tells us whether the function invocation represented
 203    by FI does not have a frame on the stack associated with it.  If it
 204    does not, FRAMELESS is set to 1, else 0.  */
 205 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 206   (FRAMELESS) = frameless_look_for_prologue(FI)
 207
 208 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 209
 210 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 211
 212 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 213
 214 /* Set VAL to the number of args passed to frame described by FI.
 215    Can set VAL to -1, meaning no way to tell.  */
 216
 217 /* We can't tell how many args there are
 218    now that the C compiler delays popping them.  */
 219 #if !defined (FRAME_NUM_ARGS)
 220 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 221 #endif
 222
 223 /* Return number of bytes at start of arglist that are not really args.  */
 224
 225 #define FRAME_ARGS_SKIP 8
 226
 227
 228 \f
 229 /* Things needed for making the inferior call functions.
 230    It seems like every m68k based machine has almost identical definitions
 231    in the individual machine's configuration files.  Most other cpu types
 232    (mips, i386, etc) have routines in their *-tdep.c files to handle this
 233    for most configurations.  The m68k family should be able to do this as
 234    well.  These macros can still be overridden when necessary.  */
 235
 236 /* The CALL_DUMMY macro is the sequence of instructions, as disassembled
 237    by gdb itself:
 238
 239         fmovemx fp0-fp7,sp@-                    0xf227 0xe0ff
 240         moveml d0-a5,sp@-                       0x48e7 0xfffc
 241         clrw sp@-                               0x4267
 242         movew ccr,sp@-                          0x42e7
 243
 244         /..* The arguments are pushed at this point by GDB;
 245         no code is needed in the dummy for this.
 246         The CALL_DUMMY_START_OFFSET gives the position of
 247         the following jsr instruction.  *../
 248
 249         jsr @#0x32323232                        0x4eb9 0x3232 0x3232
 250         addal #0x69696969,sp                    0xdffc 0x6969 0x6969
 251         trap #<your BPT_VECTOR number here>     0x4e4?
 252         nop                                     0x4e71
 253
 254    Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
 255    We actually start executing at the jsr, since the pushing of the
 256    registers is done by PUSH_DUMMY_FRAME.  If this were real code,
 257    the arguments for the function called by the jsr would be pushed
 258    between the moveml and the jsr, and we could allow it to execute through.
 259    But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
 260    done, and we cannot allow the moveml to push the registers again lest
 261    they be taken for the arguments.  */
 262
 263
 264 #define CALL_DUMMY { 0 }
 265 #define CALL_DUMMY_LENGTH 24            /* Size of CALL_DUMMY */
 266 #define CALL_DUMMY_START_OFFSET 8       /* Offset to jsr instruction*/
 267
 268
 269 /* Insert the specified number of args and function address
 270    into a call sequence of the above form stored at DUMMYNAME.
 271    We use the BFD routines to store a big-endian value of known size.  */
 272
 273 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
 274 { _do_putb32 (fun,     (char *) dummyname + CALL_DUMMY_START_OFFSET + 2);  \
 275   _do_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
 276
 277 /* Push an empty stack frame, to record the current PC, etc.  */
 278
 279 #define PUSH_DUMMY_FRAME        { z8k_push_dummy_frame (); }
 280
 281 extern void z8k_push_dummy_frame PARAMS ((void));
 282
 283 extern void z8k_pop_frame PARAMS ((void));
 284
 285 /* Discard from the stack the innermost frame, restoring all registers.  */
 286
 287 #define POP_FRAME               { z8k_pop_frame (); }
 288
 289 /* Offset from SP to first arg on stack at first instruction of a function */
 290
 291 #define SP_ARG0 (1 * 4)
 292
 293 #define ADDR_BITS_REMOVE(x) addr_bits_remove(x)
 294 #define ADDR_BITS_SET(x) addr_bits_set(x)
 295 int z8001_mode;
 296 #define BIG (z8001_mode)
 297
 298 #define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
 299
 300 #define NO_STD_REGS
 301
 302 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
 303
 304
 305 #define INIT_EXTRA_SYMTAB_INFO \
 306   z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);