gdb/config/h8300/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 extern int h8300hmode;
  23
  24 #define BINWORD (h8300hmode?4:2)
  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 /* Zero the frame_saved_regs pointer when the frame is initialized,
  33    so that FRAME_FIND_SAVED_REGS () will know to allocate and
  34    initialize a frame_saved_regs struct the first time it is called.
  35    Set the arg_pointer to -1, which is not valid; 0 and other values
  36    indicate real, cached values.  */
  37
  38 #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
  39         init_extra_frame_info (fromleaf, fi)
  40
  41 extern void init_extra_frame_info ();
  42
  43 #define IEEE_FLOAT
  44 /* Define the bit, byte, and word ordering of the machine.  */
  45 #define TARGET_BYTE_ORDER BIG_ENDIAN
  46 #undef TARGET_INT_BIT
  47 #define TARGET_INT_BIT  16
  48 #undef TARGET_LONG_BIT
  49 #define TARGET_LONG_BIT  32
  50 #undef TARGET_PTR_BIT
  51 #define TARGET_PTR_BIT  (h8300hmode ? 32:16)
  52
  53 /* Offset from address of function to start of its code.
  54    Zero on most machines.  */
  55
  56 #define FUNCTION_START_OFFSET 0
  57
  58 /* Advance PC across any function entry prologue instructions
  59    to reach some "real" code.  */
  60
  61 #define SKIP_PROLOGUE(ip)   {(ip) = h8300_skip_prologue(ip);}
  62 extern CORE_ADDR h8300_skip_prologue ();
  63
  64 /* Immediately after a function call, return the saved pc.
  65    Can't always go through the frames for this because on some machines
  66    the new frame is not set up until the new function executes
  67    some instructions.  */
  68
  69 #define SAVED_PC_AFTER_CALL(frame) \
  70   read_memory_unsigned_integer (read_register (SP_REGNUM), BINWORD)
  71
  72 /* Stack grows downward.  */
  73
  74 #define INNER_THAN <
  75
  76 #define BREAKPOINT {0x7A, 0xFF}
  77
  78 /* If your kernel resets the pc after the trap happens you may need to
  79    define this before including this file.  */
  80
  81 #define DECR_PC_AFTER_BREAK 0
  82
  83 /* Nonzero if instruction at PC is a return instruction.  */
  84 /* Allow any of the return instructions, including a trapv and a return
  85    from interupt.  */
  86
  87 #define ABOUT_TO_RETURN(pc) ((read_memory_unsigned_integer (pc, 2) & ~0x3) == 0x4e74)
  88
  89 /* Return 1 if P points to an invalid floating point value.  */
  90
  91 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
  92
  93 /* Say how long registers are.  */
  94
  95 #define REGISTER_TYPE  unsigned short
  96
  97 #if 0
  98 #  define NUM_REGS 20 /* 20 for fake HW support */
  99 #else
 100 #define NUM_REGS 13
 101 #endif
 102
 103 #define REGISTER_BYTES (NUM_REGS * 4)
 104
 105 /* Index within `registers' of the first byte of the space for
 106    register N.  */
 107
 108 #define REGISTER_BYTE(N)  ((N) * 4)
 109
 110 /* Number of bytes of storage in the actual machine representation
 111    for register N.  On the H8/300, all regs are 2 bytes.  */
 112
 113 #define REGISTER_RAW_SIZE(N) (h8300hmode ? 4 : 2)
 114
 115 /* Number of bytes of storage in the program's representation
 116    for register N.  */
 117
 118 #define REGISTER_VIRTUAL_SIZE(N) (h8300hmode ? 4 : 2)
 119
 120 /* Largest value REGISTER_RAW_SIZE can have.  */
 121
 122 #define MAX_REGISTER_RAW_SIZE 4
 123
 124 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 125
 126 #define MAX_REGISTER_VIRTUAL_SIZE 4
 127
 128 /* Nonzero if register N requires conversion
 129    from raw format to virtual format.  */
 130
 131 #define REGISTER_CONVERTIBLE(N) 0
 132
 133 /* Convert data from raw format for register REGNUM
 134    to virtual format for register REGNUM.  */
 135
 136 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
 137 { memcpy((TO), (FROM),  REGISTER_RAW_SIZE (REGNUM)); }
 138
 139 /* Convert data from virtual format for register REGNUM
 140    to raw format for register REGNUM.  */
 141
 142 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 143 { memcpy((TO), (FROM),  REGISTER_RAW_SIZE (REGNUM)); }
 144
 145 /* Return the GDB type object for the "standard" data type
 146    of data in register N.  */
 147
 148 #define REGISTER_VIRTUAL_TYPE(N) \
 149 (h8300hmode ? builtin_type_unsigned_long : builtin_type_unsigned_short)
 150
 151 /* Initializer for an array of names of registers.
 152    Entries beyond the first NUM_REGS are ignored.  */
 153
 154 #if NUM_REGS==20
 155 #define REGISTER_NAMES  \
 156  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp",\
 157   "ccr","pc","cycles","hcheck","tier","tcsr","frc",\
 158    "ocra","ocrb","tcr","tocr","icra"}
 159 #else
 160 #define REGISTER_NAMES \
 161   {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp", "ccr","pc","cycles","tick","inst"}
 162 #endif
 163
 164 /* Register numbers of various important registers.
 165    Note that some of these values are "real" register numbers,
 166    and correspond to the general registers of the machine,
 167    and some are "phony" register numbers which are too large
 168    to be actual register numbers as far as the user is concerned
 169    but do serve to get the desired values when passed to read_register.  */
 170
 171 #define FP_REGNUM 6             /* Contains address of executing stack frame */
 172 #define SP_REGNUM 7             /* Contains address of top of stack */
 173 #define CCR_REGNUM 8            /* Contains processor status */
 174 #define PC_REGNUM 9             /* Contains program counter */
 175
 176 /* Store the address of the place in which to copy the structure the
 177    subroutine will return.  This is called from call_function. */
 178
 179 /*#define STORE_STRUCT_RETURN(ADDR, SP) \
 180   { write_register (0, (ADDR)); abort(); }*/
 181
 182 /* Extract from an array REGBUF containing the (raw) register state
 183    a function return value of type TYPE, and copy that, in virtual format,
 184    into VALBUF.  */
 185 /* FIXME: Won't work with both h8/300's.  */
 186
 187 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 188   memcpy (VALBUF, (char *)(REGBUF), TYPE_LENGTH(TYPE))
 189
 190 /* Write into appropriate registers a function return value
 191    of type TYPE, given in virtual format.  Assumes floats are passed
 192    in d0/d1.  */
 193 /* FIXME: Won't work with both h8/300's.  */
 194
 195 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 196   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 197
 198 /* Extract from an array REGBUF containing the (raw) register state
 199    the address in which a function should return its structure value,
 200    as a CORE_ADDR (or an expression that can be used as one).  */
 201 /* FIXME: Won't work with both h8/300's.  */
 202
 203 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 204 \f
 205 /* Describe the pointer in each stack frame to the previous stack frame
 206    (its caller).  */
 207
 208 /* FRAME_CHAIN takes a frame's nominal address
 209    and produces the frame's chain-pointer.
 210
 211    However, if FRAME_CHAIN_VALID returns zero,
 212    it means the given frame is the outermost one and has no caller.  */
 213
 214 /* In the case of the H8/300, the frame's nominal address
 215    is the address of a 2-byte word containing the calling frame's address.  */
 216
 217 /* Use the alternate method of avoiding running up off the end of
 218    the frame chain or following frames back into the startup code.
 219    See the comments in objfile.h */
 220
 221 #define FRAME_CHAIN_VALID_ALTERNATE
 222
 223 /* Define other aspects of the stack frame.  */
 224
 225 /* A macro that tells us whether the function invocation represented
 226    by FI does not have a frame on the stack associated with it.  If it
 227    does not, FRAMELESS is set to 1, else 0.  */
 228 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 229   (FRAMELESS) = frameless_look_for_prologue(FI)
 230
 231 /* Any function with a frame looks like this
 232    SECOND ARG
 233    FIRST ARG
 234    RET PC
 235    SAVED R2
 236    SAVED R3
 237    SAVED FP   <-FP POINTS HERE
 238    LOCALS0
 239    LOCALS1    <-SP POINTS HERE
 240    */
 241
 242 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 243
 244 #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi)
 245
 246 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi);
 247
 248 /* Set VAL to the number of args passed to frame described by FI.
 249    Can set VAL to -1, meaning no way to tell.  */
 250
 251 /* We can't tell how many args there are
 252    now that the C compiler delays popping them.  */
 253
 254 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 255
 256 /* Return number of bytes at start of arglist that are not really args.  */
 257
 258 #define FRAME_ARGS_SKIP 0
 259
 260 /* Put here the code to store, into a struct frame_saved_regs,
 261    the addresses of the saved registers of frame described by FRAME_INFO.
 262    This includes special registers such as pc and fp saved in special
 263    ways in the stack frame.  sp is even more special:
 264    the address we return for it IS the sp for the next frame.  */
 265
 266 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)         \
 267    frame_find_saved_regs(frame_info, &(frame_saved_regs))
 268 \f
 269
 270 /* Push an empty stack frame, to record the current PC, etc.  */
 271
 272 /*#define PUSH_DUMMY_FRAME      { h8300_push_dummy_frame (); }*/
 273
 274 /* Discard from the stack the innermost frame, restoring all registers.  */
 275
 276 #define POP_FRAME               { h8300_pop_frame (); }
 277
 278 #define SHORT_INT_MAX 32767
 279 #define SHORT_INT_MIN -32768
 280
 281 #define BEFORE_MAIN_LOOP_HOOK   \
 282   hms_before_main_loop();
 283
 284 typedef unsigned short INSN_WORD;
 285
 286 #define ADDR_BITS_REMOVE(addr) ((addr) & 0xffff)
 287 #define ADDR_BITS_SET(addr) (((addr)))
 288
 289 #define DONT_USE_REMOTE
 290
 291 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)