gdb/tm-h8300.h

   1 /* Parameters for execution on a H8/300 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 /* 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 20 /* 20 for fake HW support */
 106 #  define NUM_REGS 11
 107 #  define REGISTER_BYTES (NUM_REGS*2)
 108
 109
 110 /* Index within `registers' of the first byte of the space for
 111    register N.  */
 112
 113 #define REGISTER_BYTE(N)  ((N) * 2)
 114
 115 /* Number of bytes of storage in the actual machine representation
 116    for register N.  On the H8/300, all regs are 2 bytes.  */
 117
 118 #define REGISTER_RAW_SIZE(N) 2
 119
 120 /* Number of bytes of storage in the program's representation
 121    for register N.  On the H8/300, all regs are 2 bytes.  */
 122
 123 #define REGISTER_VIRTUAL_SIZE(N) 2
 124
 125 /* Largest value REGISTER_RAW_SIZE can have.  */
 126
 127 #define MAX_REGISTER_RAW_SIZE 2
 128
 129 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 130
 131 #define MAX_REGISTER_VIRTUAL_SIZE 2
 132
 133 /* Nonzero if register N requires conversion
 134    from raw format to virtual format.  */
 135
 136 #define REGISTER_CONVERTIBLE(N) 1
 137
 138 /* Convert data from raw format for register REGNUM
 139    to virtual format for register REGNUM.  */
 140
 141 /*#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)  */
 142
 143 /* Convert data from virtual format for register REGNUM
 144    to raw format for register REGNUM.  */
 145
 146 /*#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)  */
 147
 148 /* Return the GDB type object for the "standard" data type
 149    of data in register N.  */
 150
 151 #define REGISTER_VIRTUAL_TYPE(N)  builtin_type_unsigned_short
 152
 153
 154 /* Initializer for an array of names of registers.
 155    Entries beyond the first NUM_REGS are ignored.  */
 156
 157 #if NUM_REGS==20
 158 #define REGISTER_NAMES  \
 159  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp",\
 160   "ccr","pc","cycles","hcheck","tier","tcsr","frc",\
 161    "ocra","ocrb","tcr","tocr","icra"}
 162 #else
 163 #define REGISTER_NAMES \
 164   {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp", "ccr","pc","cycles"}
 165 #endif
 166
 167 /* Register numbers of various important registers.
 168    Note that some of these values are "real" register numbers,
 169    and correspond to the general registers of the machine,
 170    and some are "phony" register numbers which are too large
 171    to be actual register numbers as far as the user is concerned
 172    but do serve to get the desired values when passed to read_register.  */
 173
 174
 175 #define FP_REGNUM 6             /* Contains address of executing stack frame */
 176 #define SP_REGNUM 7             /* Contains address of top of stack */
 177 #define CCR_REGNUM 8            /* Contains processor status */
 178 #define PC_REGNUM 9             /* Contains program counter */
 179
 180 /* Store the address of the place in which to copy the structure the
 181    subroutine will return.  This is called from call_function. */
 182
 183 /*#define STORE_STRUCT_RETURN(ADDR, SP) \
 184   { write_register (0, (ADDR)); abort(); }*/
 185
 186 /* Extract from an array REGBUF containing the (raw) register state
 187    a function return value of type TYPE, and copy that, in virtual format,
 188    into VALBUF.  */
 189
 190 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 191   bcopy ((char *)(REGBUF), VALBUF, TYPE_LENGTH(TYPE))
 192
 193
 194 /* Write into appropriate registers a function return value
 195    of type TYPE, given in virtual format.  Assumes floats are passed
 196    in d0/d1.  */
 197
 198
 199 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 200   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 201
 202
 203 /* Extract from an array REGBUF containing the (raw) register state
 204    the address in which a function should return its structure value,
 205    as a CORE_ADDR (or an expression that can be used as one).  */
 206
 207 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 208 \f
 209 /* Describe the pointer in each stack frame to the previous stack frame
 210    (its caller).  */
 211
 212 /* FRAME_CHAIN takes a frame's nominal address
 213    and produces the frame's chain-pointer.
 214
 215    However, if FRAME_CHAIN_VALID returns zero,
 216    it means the given frame is the outermost one and has no caller.  */
 217
 218 /* In the case of the H8/300, the frame's nominal address
 219    is the address of a 2-byte word containing the calling frame's address.  */
 220
 221 /* Use the alternate method of avoiding running up off the end of
 222    the frame chain or following frames back into the startup code.
 223    See the comments in objfile.h */
 224
 225 #define FRAME_CHAIN_VALID_ALTERNATE
 226
 227 /* Define other aspects of the stack frame.  */
 228
 229 /* A macro that tells us whether the function invocation represented
 230    by FI does not have a frame on the stack associated with it.  If it
 231    does not, FRAMELESS is set to 1, else 0.  */
 232 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 233   (FRAMELESS) = frameless_look_for_prologue(FI)
 234
 235 /* Any function with a frame looks like this
 236    SECOND ARG
 237    FIRST ARG
 238    RET PC
 239    SAVED R2
 240    SAVED R3
 241    SAVED FP   <-FP POINTS HERE
 242    LOCALS0
 243    LOCALS1    <-SP POINTS HERE
 244
 245    */
 246 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 247
 248 #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi)
 249
 250 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi);
 251
 252 /* Set VAL to the number of args passed to frame described by FI.
 253    Can set VAL to -1, meaning no way to tell.  */
 254
 255 /* We can't tell how many args there are
 256    now that the C compiler delays popping them.  */
 257
 258 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 259
 260
 261 /* Return number of bytes at start of arglist that are not really args.  */
 262
 263 #define FRAME_ARGS_SKIP 0
 264
 265 /* Put here the code to store, into a struct frame_saved_regs,
 266    the addresses of the saved registers of frame described by FRAME_INFO.
 267    This includes special registers such as pc and fp saved in special
 268    ways in the stack frame.  sp is even more special:
 269    the address we return for it IS the sp for the next frame.  */
 270
 271 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)         \
 272    frame_find_saved_regs(frame_info, &(frame_saved_regs))
 273 \f
 274
 275 /* Push an empty stack frame, to record the current PC, etc.  */
 276
 277 /*#define PUSH_DUMMY_FRAME      { h8300_push_dummy_frame (); }*/
 278
 279 /* Discard from the stack the innermost frame, restoring all registers.  */
 280
 281 #define POP_FRAME               { h8300_pop_frame (); }
 282
 283 #define SHORT_INT_MAX 32767
 284 #define SHORT_INT_MIN -32768
 285
 286
 287 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
 288 { memcpy((TO), (FROM),  2); }
 289 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 290 { memcpy((TO), (FROM),  2); }
 291
 292 #define BEFORE_MAIN_LOOP_HOOK   \
 293   hms_before_main_loop();
 294
 295 typedef unsigned short INSN_WORD;
 296
 297 #define ADDR_BITS_REMOVE(addr) ((addr) & 0xffff)
 298 #define ADDR_BITS_SET(addr) (((addr)))
 299
 300 #define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
 301 #define DONT_USE_REMOTE
 302
 303
 304 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
 305