gdb/tm-h8300.h

   1 /* Parameters for execution on a H8/300 series machine.
   2    Copyright (C) 1992 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 /* Contributed by Steve Chamberlain sac@cygnus.com */
  21
  22
  23 #define UNSIGNED_SHORT(X) ((X) & 0xffff)
  24
  25
  26 #define EXTRA_FRAME_INFO        \
  27         struct frame_saved_regs *fsr;   \
  28         CORE_ADDR from_pc; \
  29         CORE_ADDR args_pointer;\
  30         CORE_ADDR locals_pointer ;
  31
  32
  33
  34 /* Zero the frame_saved_regs pointer when the frame is initialized,
  35    so that FRAME_FIND_SAVED_REGS () will know to allocate and
  36    initialize a frame_saved_regs struct the first time it is called.
  37    Set the arg_pointer to -1, which is not valid; 0 and other values
  38    indicate real, cached values.  */
  39
  40 #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
  41         init_extra_frame_info (fromleaf, fi)
  42
  43 extern void init_extra_frame_info ();
  44
  45
  46 #define IEEE_FLOAT
  47 /* Define the bit, byte, and word ordering of the machine.  */
  48 #define TARGET_BYTE_ORDER BIG_ENDIAN
  49 #undef TARGET_INT_BIT
  50 #define TARGET_INT_BIT 16
  51 #undef TARGET_PTR_BIT
  52 #define TARGET_PTR_BIT 16
  53
  54
  55 /* Offset from address of function to start of its code.
  56    Zero on most machines.  */
  57
  58 #define FUNCTION_START_OFFSET 0
  59
  60 /* Advance PC across any function entry prologue instructions
  61    to reach some "real" code.  */
  62
  63
  64 #define SKIP_PROLOGUE(ip)   {(ip) = h8300_skip_prologue(ip);}
  65 extern CORE_ADDR h8300_skip_prologue ();
  66
  67
  68 /* Immediately after a function call, return the saved pc.
  69    Can't always go through the frames for this because on some machines
  70    the new frame is not set up until the new function executes
  71    some instructions.  */
  72
  73 #define SAVED_PC_AFTER_CALL(frame) \
  74 UNSIGNED_SHORT(read_memory_integer (read_register (SP_REGNUM), 2))
  75
  76 /* Stack grows downward.  */
  77
  78 #define INNER_THAN <
  79
  80 /* Sequence of bytes for breakpoint instruction.
  81    This is a TRAP instruction.  The last 4 bits (0xf below) is the
  82    vector.  Systems which don't use 0xf should define BPT_VECTOR
  83    themselves before including this file.  */
  84
  85
  86 #define BPT_VECTOR 0xf
  87
  88
  89
  90 #define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)}
  91
  92
  93 /* If your kernel resets the pc after the trap happens you may need to
  94    define this before including this file.  */
  95
  96
  97 #define DECR_PC_AFTER_BREAK 0
  98
  99
 100 /* Nonzero if instruction at PC is a return instruction.  */
 101 /* Allow any of the return instructions, including a trapv and a return
 102    from interupt.  */
 103
 104 #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 2) & ~0x3) == 0x4e74)
 105
 106 /* Return 1 if P points to an invalid floating point value.  */
 107
 108 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
 109
 110 /* Say how long registers are.  */
 111
 112 #define REGISTER_TYPE  unsigned short
 113
 114 #  define NUM_REGS 10
 115 #  define REGISTER_BYTES (10*2)
 116
 117
 118 /* Index within `registers' of the first byte of the space for
 119    register N.  */
 120
 121 #define REGISTER_BYTE(N)  ((N) * 2)
 122
 123 /* Number of bytes of storage in the actual machine representation
 124    for register N.  On the H8/300, all regs are 2 bytes.  */
 125
 126 #define REGISTER_RAW_SIZE(N) 2
 127
 128 /* Number of bytes of storage in the program's representation
 129    for register N.  On the H8/300, all regs are 2 bytes.  */
 130
 131 #define REGISTER_VIRTUAL_SIZE(N) 2
 132
 133 /* Largest value REGISTER_RAW_SIZE can have.  */
 134
 135 #define MAX_REGISTER_RAW_SIZE 2
 136
 137 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 138
 139 #define MAX_REGISTER_VIRTUAL_SIZE 2
 140
 141 /* Nonzero if register N requires conversion
 142    from raw format to virtual format.  */
 143
 144 #define REGISTER_CONVERTIBLE(N) 1
 145
 146 /* Convert data from raw format for register REGNUM
 147    to virtual format for register REGNUM.  */
 148
 149 /*#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)  */
 150
 151 /* Convert data from virtual format for register REGNUM
 152    to raw format for register REGNUM.  */
 153
 154 /*#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)  */
 155
 156 /* Return the GDB type object for the "standard" data type
 157    of data in register N.  */
 158
 159 #define REGISTER_VIRTUAL_TYPE(N)  builtin_type_unsigned_short
 160
 161
 162 /* Initializer for an array of names of registers.
 163    Entries beyond the first NUM_REGS are ignored.  */
 164
 165 #define REGISTER_NAMES  \
 166  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp","ccr","pc"}
 167
 168
 169 /* Register numbers of various important registers.
 170    Note that some of these values are "real" register numbers,
 171    and correspond to the general registers of the machine,
 172    and some are "phony" register numbers which are too large
 173    to be actual register numbers as far as the user is concerned
 174    but do serve to get the desired values when passed to read_register.  */
 175
 176
 177 #define FP_REGNUM 6             /* Contains address of executing stack frame */
 178 #define SP_REGNUM 7             /* Contains address of top of stack */
 179 #define CCR_REGNUM 8            /* Contains processor status */
 180 #define PC_REGNUM 9             /* Contains program counter */
 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 /*#define STORE_STRUCT_RETURN(ADDR, SP) \
 186   { write_register (0, (ADDR)); abort(); }*/
 187
 188 /* Extract from an array REGBUF containing the (raw) register state
 189    a function return value of type TYPE, and copy that, in virtual format,
 190    into VALBUF.  */
 191
 192 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 193   bcopy ((char *)(REGBUF), VALBUF, TYPE_LENGTH(TYPE))
 194
 195
 196 /* Write into appropriate registers a function return value
 197    of type TYPE, given in virtual format.  Assumes floats are passed
 198    in d0/d1.  */
 199
 200
 201 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 202   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 203
 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) (*(CORE_ADDR *)(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    However, if FRAME_CHAIN_VALID returns zero,
 218    it means the given frame is the outermost one and has no caller.  */
 219
 220 /* In the case of the H8/300, the frame's nominal address
 221    is the address of a 2-byte word containing the calling frame's address.  */
 222
 223 /* Use the alternate method of avoiding running up off the end of
 224    the frame chain or following frames back into the startup code.
 225    See the comments in objfile.h */
 226
 227 #define FRAME_CHAIN_VALID_ALTERNATE
 228
 229 /* Define other aspects of the stack frame.  */
 230
 231 /* A macro that tells us whether the function invocation represented
 232    by FI does not have a frame on the stack associated with it.  If it
 233    does not, FRAMELESS is set to 1, else 0.  */
 234 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 235   (FRAMELESS) = frameless_look_for_prologue(FI)
 236
 237 /* Any function with a frame looks like this
 238    SECOND ARG
 239    FIRST ARG
 240    RET PC
 241    SAVED R2
 242    SAVED R3
 243    SAVED FP   <-FP POINTS HERE
 244    LOCALS0
 245    LOCALS1    <-SP POINTS HERE
 246
 247    */
 248 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 249
 250 #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi)
 251
 252 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi);
 253
 254 /* Set VAL to the number of args passed to frame described by FI.
 255    Can set VAL to -1, meaning no way to tell.  */
 256
 257 /* We can't tell how many args there are
 258    now that the C compiler delays popping them.  */
 259
 260 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 261
 262
 263 /* Return number of bytes at start of arglist that are not really args.  */
 264
 265 #define FRAME_ARGS_SKIP 0
 266
 267 /* Put here the code to store, into a struct frame_saved_regs,
 268    the addresses of the saved registers of frame described by FRAME_INFO.
 269    This includes special registers such as pc and fp saved in special
 270    ways in the stack frame.  sp is even more special:
 271    the address we return for it IS the sp for the next frame.  */
 272
 273 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)         \
 274    frame_find_saved_regs(frame_info, &(frame_saved_regs))
 275 \f
 276
 277 /* Push an empty stack frame, to record the current PC, etc.  */
 278
 279 /*#define PUSH_DUMMY_FRAME      { h8300_push_dummy_frame (); }*/
 280
 281 /* Discard from the stack the innermost frame, restoring all registers.  */
 282
 283 #define POP_FRAME               { h8300_pop_frame (); }
 284
 285 #define SHORT_INT_MAX 32767
 286 #define SHORT_INT_MIN -32768
 287
 288
 289 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
 290 { memcpy((TO), (FROM),  2); }
 291 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 292 { memcpy((TO), (FROM),  2); }
 293
 294 #define BEFORE_MAIN_LOOP_HOOK   \
 295   hms_before_main_loop();
 296
 297
 298 #define NAMES_HAVE_UNDERSCORE
 299
 300 typedef unsigned short INSN_WORD;
 301
 302 #define ADDR_BITS_REMOVE(addr) ((addr) & 0xffff)
 303 #define ADDR_BITS_SET(addr) (((addr)))
 304
 305 #define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
 306 #define DONT_USE_REMOTE
 307