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
  81 #define BREAKPOINT {0x53, 0x00}
  82
  83
  84 /* If your kernel resets the pc after the trap happens you may need to
  85    define this before including this file.  */
  86
  87
  88 #define DECR_PC_AFTER_BREAK 0
  89
  90
  91 /* Nonzero if instruction at PC is a return instruction.  */
  92 /* Allow any of the return instructions, including a trapv and a return
  93    from interupt.  */
  94
  95 #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 2) & ~0x3) == 0x4e74)
  96
  97 /* Return 1 if P points to an invalid floating point value.  */
  98
  99 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
 100
 101 /* Say how long registers are.  */
 102
 103 #define REGISTER_TYPE  unsigned short
 104
 105 #  define NUM_REGS 10
 106 #  define REGISTER_BYTES (10*2)
 107
 108
 109 /* Index within `registers' of the first byte of the space for
 110    register N.  */
 111
 112 #define REGISTER_BYTE(N)  ((N) * 2)
 113
 114 /* Number of bytes of storage in the actual machine representation
 115    for register N.  On the H8/300, all regs are 2 bytes.  */
 116
 117 #define REGISTER_RAW_SIZE(N) 2
 118
 119 /* Number of bytes of storage in the program's representation
 120    for register N.  On the H8/300, all regs are 2 bytes.  */
 121
 122 #define REGISTER_VIRTUAL_SIZE(N) 2
 123
 124 /* Largest value REGISTER_RAW_SIZE can have.  */
 125
 126 #define MAX_REGISTER_RAW_SIZE 2
 127
 128 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 129
 130 #define MAX_REGISTER_VIRTUAL_SIZE 2
 131
 132 /* Nonzero if register N requires conversion
 133    from raw format to virtual format.  */
 134
 135 #define REGISTER_CONVERTIBLE(N) 1
 136
 137 /* Convert data from raw format for register REGNUM
 138    to virtual format for register REGNUM.  */
 139
 140 /*#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)  */
 141
 142 /* Convert data from virtual format for register REGNUM
 143    to raw format for register REGNUM.  */
 144
 145 /*#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)  */
 146
 147 /* Return the GDB type object for the "standard" data type
 148    of data in register N.  */
 149
 150 #define REGISTER_VIRTUAL_TYPE(N)  builtin_type_unsigned_short
 151
 152
 153 /* Initializer for an array of names of registers.
 154    Entries beyond the first NUM_REGS are ignored.  */
 155
 156 #define REGISTER_NAMES  \
 157  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp","ccr","pc"}
 158
 159
 160 /* Register numbers of various important registers.
 161    Note that some of these values are "real" register numbers,
 162    and correspond to the general registers of the machine,
 163    and some are "phony" register numbers which are too large
 164    to be actual register numbers as far as the user is concerned
 165    but do serve to get the desired values when passed to read_register.  */
 166
 167
 168 #define FP_REGNUM 6             /* Contains address of executing stack frame */
 169 #define SP_REGNUM 7             /* Contains address of top of stack */
 170 #define CCR_REGNUM 8            /* Contains processor status */
 171 #define PC_REGNUM 9             /* Contains program counter */
 172
 173 /* Store the address of the place in which to copy the structure the
 174    subroutine will return.  This is called from call_function. */
 175
 176 /*#define STORE_STRUCT_RETURN(ADDR, SP) \
 177   { write_register (0, (ADDR)); abort(); }*/
 178
 179 /* Extract from an array REGBUF containing the (raw) register state
 180    a function return value of type TYPE, and copy that, in virtual format,
 181    into VALBUF.  */
 182
 183 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 184   bcopy ((char *)(REGBUF), VALBUF, TYPE_LENGTH(TYPE))
 185
 186
 187 /* Write into appropriate registers a function return value
 188    of type TYPE, given in virtual format.  Assumes floats are passed
 189    in d0/d1.  */
 190
 191
 192 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 193   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 194
 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) (*(CORE_ADDR *)(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    However, if FRAME_CHAIN_VALID returns zero,
 209    it means the given frame is the outermost one and has no caller.  */
 210
 211 /* In the case of the H8/300, the frame's nominal address
 212    is the address of a 2-byte word containing the calling frame's address.  */
 213
 214 /* Use the alternate method of avoiding running up off the end of
 215    the frame chain or following frames back into the startup code.
 216    See the comments in objfile.h */
 217
 218 #define FRAME_CHAIN_VALID_ALTERNATE
 219
 220 /* Define other aspects of the stack frame.  */
 221
 222 /* A macro that tells us whether the function invocation represented
 223    by FI does not have a frame on the stack associated with it.  If it
 224    does not, FRAMELESS is set to 1, else 0.  */
 225 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 226   (FRAMELESS) = frameless_look_for_prologue(FI)
 227
 228 /* Any function with a frame looks like this
 229    SECOND ARG
 230    FIRST ARG
 231    RET PC
 232    SAVED R2
 233    SAVED R3
 234    SAVED FP   <-FP POINTS HERE
 235    LOCALS0
 236    LOCALS1    <-SP POINTS HERE
 237
 238    */
 239 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 240
 241 #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi)
 242
 243 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi);
 244
 245 /* Set VAL to the number of args passed to frame described by FI.
 246    Can set VAL to -1, meaning no way to tell.  */
 247
 248 /* We can't tell how many args there are
 249    now that the C compiler delays popping them.  */
 250
 251 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 252
 253
 254 /* Return number of bytes at start of arglist that are not really args.  */
 255
 256 #define FRAME_ARGS_SKIP 0
 257
 258 /* Put here the code to store, into a struct frame_saved_regs,
 259    the addresses of the saved registers of frame described by FRAME_INFO.
 260    This includes special registers such as pc and fp saved in special
 261    ways in the stack frame.  sp is even more special:
 262    the address we return for it IS the sp for the next frame.  */
 263
 264 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)         \
 265    frame_find_saved_regs(frame_info, &(frame_saved_regs))
 266 \f
 267
 268 /* Push an empty stack frame, to record the current PC, etc.  */
 269
 270 /*#define PUSH_DUMMY_FRAME      { h8300_push_dummy_frame (); }*/
 271
 272 /* Discard from the stack the innermost frame, restoring all registers.  */
 273
 274 #define POP_FRAME               { h8300_pop_frame (); }
 275
 276 #define SHORT_INT_MAX 32767
 277 #define SHORT_INT_MIN -32768
 278
 279
 280 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
 281 { memcpy((TO), (FROM),  2); }
 282 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 283 { memcpy((TO), (FROM),  2); }
 284
 285 #define BEFORE_MAIN_LOOP_HOOK   \
 286   hms_before_main_loop();
 287
 288
 289 #define NAMES_HAVE_UNDERSCORE
 290
 291 typedef unsigned short INSN_WORD;
 292
 293 #define ADDR_BITS_REMOVE(addr) ((addr) & 0xffff)
 294 #define ADDR_BITS_SET(addr) (((addr)))
 295
 296 #define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
 297 #define DONT_USE_REMOTE
 298
 299
 300 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
 301