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 /* 20 for fake HW support */
 106 #  define REGISTER_BYTES (NUM_REGS*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",\
 158   "ccr","pc","cycles","hcheck","tier","tcsr","frc","ocra","ocrb","tcr","tocr","icra"}
 159
 160
 161 /* Register numbers of various important registers.
 162    Note that some of these values are "real" register numbers,
 163    and correspond to the general registers of the machine,
 164    and some are "phony" register numbers which are too large
 165    to be actual register numbers as far as the user is concerned
 166    but do serve to get the desired values when passed to read_register.  */
 167
 168
 169 #define FP_REGNUM 6             /* Contains address of executing stack frame */
 170 #define SP_REGNUM 7             /* Contains address of top of stack */
 171 #define CCR_REGNUM 8            /* Contains processor status */
 172 #define PC_REGNUM 9             /* Contains program counter */
 173
 174 /* Store the address of the place in which to copy the structure the
 175    subroutine will return.  This is called from call_function. */
 176
 177 /*#define STORE_STRUCT_RETURN(ADDR, SP) \
 178   { write_register (0, (ADDR)); abort(); }*/
 179
 180 /* Extract from an array REGBUF containing the (raw) register state
 181    a function return value of type TYPE, and copy that, in virtual format,
 182    into VALBUF.  */
 183
 184 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 185   bcopy ((char *)(REGBUF), VALBUF, TYPE_LENGTH(TYPE))
 186
 187
 188 /* Write into appropriate registers a function return value
 189    of type TYPE, given in virtual format.  Assumes floats are passed
 190    in d0/d1.  */
 191
 192
 193 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 194   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 195
 196
 197 /* Extract from an array REGBUF containing the (raw) register state
 198    the address in which a function should return its structure value,
 199    as a CORE_ADDR (or an expression that can be used as one).  */
 200
 201 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 202 \f
 203 /* Describe the pointer in each stack frame to the previous stack frame
 204    (its caller).  */
 205
 206 /* FRAME_CHAIN takes a frame's nominal address
 207    and produces the frame's chain-pointer.
 208
 209    However, if FRAME_CHAIN_VALID returns zero,
 210    it means the given frame is the outermost one and has no caller.  */
 211
 212 /* In the case of the H8/300, the frame's nominal address
 213    is the address of a 2-byte word containing the calling frame's address.  */
 214
 215 /* Use the alternate method of avoiding running up off the end of
 216    the frame chain or following frames back into the startup code.
 217    See the comments in objfile.h */
 218
 219 #define FRAME_CHAIN_VALID_ALTERNATE
 220
 221 /* Define other aspects of the stack frame.  */
 222
 223 /* A macro that tells us whether the function invocation represented
 224    by FI does not have a frame on the stack associated with it.  If it
 225    does not, FRAMELESS is set to 1, else 0.  */
 226 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 227   (FRAMELESS) = frameless_look_for_prologue(FI)
 228
 229 /* Any function with a frame looks like this
 230    SECOND ARG
 231    FIRST ARG
 232    RET PC
 233    SAVED R2
 234    SAVED R3
 235    SAVED FP   <-FP POINTS HERE
 236    LOCALS0
 237    LOCALS1    <-SP POINTS HERE
 238
 239    */
 240 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 241
 242 #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi)
 243
 244 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi);
 245
 246 /* Set VAL to the number of args passed to frame described by FI.
 247    Can set VAL to -1, meaning no way to tell.  */
 248
 249 /* We can't tell how many args there are
 250    now that the C compiler delays popping them.  */
 251
 252 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 253
 254
 255 /* Return number of bytes at start of arglist that are not really args.  */
 256
 257 #define FRAME_ARGS_SKIP 0
 258
 259 /* Put here the code to store, into a struct frame_saved_regs,
 260    the addresses of the saved registers of frame described by FRAME_INFO.
 261    This includes special registers such as pc and fp saved in special
 262    ways in the stack frame.  sp is even more special:
 263    the address we return for it IS the sp for the next frame.  */
 264
 265 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)         \
 266    frame_find_saved_regs(frame_info, &(frame_saved_regs))
 267 \f
 268
 269 /* Push an empty stack frame, to record the current PC, etc.  */
 270
 271 /*#define PUSH_DUMMY_FRAME      { h8300_push_dummy_frame (); }*/
 272
 273 /* Discard from the stack the innermost frame, restoring all registers.  */
 274
 275 #define POP_FRAME               { h8300_pop_frame (); }
 276
 277 #define SHORT_INT_MAX 32767
 278 #define SHORT_INT_MIN -32768
 279
 280
 281 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
 282 { memcpy((TO), (FROM),  2); }
 283 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 284 { memcpy((TO), (FROM),  2); }
 285
 286 #define BEFORE_MAIN_LOOP_HOOK   \
 287   hms_before_main_loop();
 288
 289
 290 #define NAMES_HAVE_UNDERSCORE
 291
 292 typedef unsigned short INSN_WORD;
 293
 294 #define ADDR_BITS_REMOVE(addr) ((addr) & 0xffff)
 295 #define ADDR_BITS_SET(addr) (((addr)))
 296
 297 #define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
 298 #define DONT_USE_REMOTE
 299
 300
 301 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
 302