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
  23 /* 1 if debugging H8/300H application */
  24 extern int h8300hmode;
  25
  26 /* Number of bytes in a word */
  27
  28 #define BINWORD (h8300hmode?4:2)
  29
  30 #define EXTRA_FRAME_INFO        \
  31         struct frame_saved_regs *fsr;   \
  32         CORE_ADDR from_pc; \
  33         CORE_ADDR args_pointer;\
  34         CORE_ADDR locals_pointer ;
  35
  36 /* Zero the frame_saved_regs pointer when the frame is initialized,
  37    so that FRAME_FIND_SAVED_REGS () will know to allocate and
  38    initialize a frame_saved_regs struct the first time it is called.
  39    Set the arg_pointer to -1, which is not valid; 0 and other values
  40    indicate real, cached values.  */
  41
  42 #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
  43         init_extra_frame_info (fromleaf, fi)
  44
  45 extern void init_extra_frame_info ();
  46
  47 #define IEEE_FLOAT
  48 /* Define the bit, byte, and word ordering of the machine.  */
  49 #define TARGET_BYTE_ORDER BIG_ENDIAN
  50
  51 #define TARGET_INT_BIT  16
  52 #define TARGET_LONG_BIT  32
  53 #define TARGET_PTR_BIT  (h8300hmode ? 32:16)
  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 #define SKIP_PROLOGUE(ip)   {(ip) = h8300_skip_prologue(ip);}
  64 extern CORE_ADDR h8300_skip_prologue ();
  65
  66 /* Immediately after a function call, return the saved pc.
  67    Can't always go through the frames for this because on some machines
  68    the new frame is not set up until the new function executes
  69    some instructions.  */
  70
  71 #define SAVED_PC_AFTER_CALL(frame) \
  72   read_memory_unsigned_integer (read_register (SP_REGNUM), BINWORD)
  73
  74 /* Stack grows downward.  */
  75
  76 #define INNER_THAN <
  77
  78 /*#define BREAKPOINT {0x7A, 0xFF}*/
  79 #define BREAKPOINT {0x01, 0x80}  /* Sleep */
  80
  81 /* If your kernel resets the pc after the trap happens you may need to
  82    define this before including this file.    */
  83
  84 #define DECR_PC_AFTER_BREAK 0
  85
  86 /* Nonzero if instruction at PC is a return instruction.  */
  87 /* Allow any of the return instructions, including a trapv and a return
  88    from interupt.  */
  89
  90 #define ABOUT_TO_RETURN(pc) ((read_memory_unsigned_integer (pc, 2) & ~0x3) == 0x4e74)
  91
  92 /* Return 1 if P points to an invalid floating point value.  */
  93
  94 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
  95
  96 /* Say how long registers are.  */
  97
  98 #define REGISTER_TYPE  unsigned short
  99
 100 #define NUM_REGS 13
 101
 102 #define REGISTER_BYTES (NUM_REGS * 4)
 103
 104 /* Index within `registers' of the first byte of the space for
 105    register N.  */
 106
 107 #define REGISTER_BYTE(N)  ((N) * 4)
 108
 109 /* Number of bytes of storage in the actual machine representation
 110    for register N.  On the H8/300, all regs are 2 bytes.  */
 111
 112 #define REGISTER_RAW_SIZE(N) (h8300hmode ? 4 : 2)
 113
 114 /* Number of bytes of storage in the program's representation
 115    for register N.  */
 116
 117 #define REGISTER_VIRTUAL_SIZE(N) (h8300hmode ? 4 : 2)
 118
 119 /* Largest value REGISTER_RAW_SIZE can have.  */
 120
 121 #define MAX_REGISTER_RAW_SIZE 4
 122
 123 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 124
 125 #define MAX_REGISTER_VIRTUAL_SIZE 4
 126
 127 /* Return the GDB type object for the "standard" data type
 128    of data in register N.  */
 129
 130 #define REGISTER_VIRTUAL_TYPE(N) \
 131 (h8300hmode ? builtin_type_unsigned_long : builtin_type_unsigned_short)
 132
 133 /* Initializer for an array of names of registers.
 134    Entries beyond the first NUM_REGS are ignored.  */
 135
 136 #define REGISTER_NAMES \
 137   {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp", "ccr","pc","cycles","tick","inst"}
 138
 139 /* Register numbers of various important registers.
 140    Note that some of these values are "real" register numbers,
 141    and correspond to the general registers of the machine,
 142    and some are "phony" register numbers which are too large
 143    to be actual register numbers as far as the user is concerned
 144    but do serve to get the desired values when passed to read_register.  */
 145
 146 #define FP_REGNUM 6             /* Contains address of executing stack frame */
 147 #define SP_REGNUM 7             /* Contains address of top of stack */
 148 #define CCR_REGNUM 8            /* Contains processor status */
 149 #define PC_REGNUM 9             /* Contains program counter */
 150
 151 /* Extract from an array REGBUF containing the (raw) register state
 152    a function return value of type TYPE, and copy that, in virtual format,
 153    into VALBUF.  */
 154
 155 /* FIXME: Won't work with both h8/300's.  */
 156
 157 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 158   memcpy (VALBUF, (char *)(REGBUF), TYPE_LENGTH(TYPE))
 159
 160 /* Write into appropriate registers a function return value
 161    of type TYPE, given in virtual format.  Assumes floats are passed
 162    in d0/d1.  */
 163 /* FIXME: Won't work with both h8/300's.  */
 164
 165 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 166   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 167
 168 /* Extract from an array REGBUF containing the (raw) register state
 169    the address in which a function should return its structure value,
 170    as a CORE_ADDR (or an expression that can be used as one).  */
 171 /* FIXME: Won't work with both h8/300's.  */
 172
 173 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 174 \f
 175 /* Describe the pointer in each stack frame to the previous stack frame
 176    (its caller).  */
 177
 178 /* FRAME_CHAIN takes a frame's nominal address
 179    and produces the frame's chain-pointer.
 180
 181    However, if FRAME_CHAIN_VALID returns zero,
 182    it means the given frame is the outermost one and has no caller.  */
 183
 184 /* In the case of the H8/300, the frame's nominal address
 185    is the address of a 2-byte word containing the calling frame's address.  */
 186
 187 /* Use the alternate method of avoiding running up off the end of
 188    the frame chain or following frames back into the startup code.
 189    See the comments in objfile.h */
 190
 191 #define FRAME_CHAIN_VALID_ALTERNATE
 192
 193 /* Define other aspects of the stack frame.  */
 194
 195 /* A macro that tells us whether the function invocation represented
 196    by FI does not have a frame on the stack associated with it.  If it
 197    does not, FRAMELESS is set to 1, else 0.  */
 198 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 199   (FRAMELESS) = frameless_look_for_prologue(FI)
 200
 201 /* Any function with a frame looks like this
 202    SECOND ARG
 203    FIRST ARG
 204    RET PC
 205    SAVED R2
 206    SAVED R3
 207    SAVED FP   <-FP POINTS HERE
 208    LOCALS0
 209    LOCALS1    <-SP POINTS HERE
 210    */
 211
 212 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 213
 214 #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi)
 215
 216 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi);
 217
 218 /* Set VAL to the number of args passed to frame described by FI.
 219    Can set VAL to -1, meaning no way to tell.  */
 220
 221 /* We can't tell how many args there are
 222    now that the C compiler delays popping them.  */
 223
 224 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 225
 226 /* Return number of bytes at start of arglist that are not really args.  */
 227
 228 #define FRAME_ARGS_SKIP 0
 229
 230 /* Put here the code to store, into a struct frame_saved_regs,
 231    the addresses of the saved registers of frame described by FRAME_INFO.
 232    This includes special registers such as pc and fp saved in special
 233    ways in the stack frame.  sp is even more special:
 234    the address we return for it IS the sp for the next frame.  */
 235
 236 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)         \
 237    frame_find_saved_regs(frame_info, &(frame_saved_regs))
 238 \f
 239
 240 /* Push an empty stack frame, to record the current PC, etc.  */
 241
 242 /*#define PUSH_DUMMY_FRAME      { h8300_push_dummy_frame (); }*/
 243
 244 /* Discard from the stack the innermost frame, restoring all registers.  */
 245
 246 #define POP_FRAME               { h8300_pop_frame (); }
 247
 248 typedef unsigned short INSN_WORD;
 249
 250
 251 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
 252
 253 #define GDB_TARGET_IS_H8300
 254
 255 #define NUM_REALREGS 10
 256 #define NOP { 0x01, 0x80} /* A sleep insn */