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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 #undef TARGET_INT_BIT
  51 #define TARGET_INT_BIT  16
  52 #undef TARGET_LONG_BIT
  53 #define TARGET_LONG_BIT  32
  54 #undef TARGET_PTR_BIT
  55 #define TARGET_PTR_BIT  (h8300hmode ? 32:16)
  56
  57 /* Offset from address of function to start of its code.
  58    Zero on most machines.  */
  59
  60 #define FUNCTION_START_OFFSET 0
  61
  62 /* Advance PC across any function entry prologue instructions
  63    to reach some "real" code.  */
  64
  65 #define SKIP_PROLOGUE(ip)   {(ip) = h8300_skip_prologue(ip);}
  66 extern CORE_ADDR h8300_skip_prologue ();
  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   read_memory_unsigned_integer (read_register (SP_REGNUM), BINWORD)
  75
  76 /* Stack grows downward.  */
  77
  78 #define INNER_THAN <
  79
  80 /*#define BREAKPOINT {0x7A, 0xFF}*/
  81 #define BREAKPOINT {0x01, 0x80}  /* Sleep */
  82 #define REMOTE_BREAKPOINT { 0x57, 0x30}  /* trapa #3 */
  83 /* If your kernel resets the pc after the trap happens you may need to
  84    define this before including this file.    */
  85
  86 #define DECR_PC_AFTER_BREAK 0
  87
  88 /* Nonzero if instruction at PC is a return instruction.  */
  89 /* Allow any of the return instructions, including a trapv and a return
  90    from interupt.  */
  91
  92 #define ABOUT_TO_RETURN(pc) ((read_memory_unsigned_integer (pc, 2) & ~0x3) == 0x4e74)
  93
  94 /* Say how long registers are.  */
  95
  96 #define REGISTER_SIZE 4
  97
  98 #define NUM_REGS 13
  99
 100 #define REGISTER_BYTES (NUM_REGS * 4)
 101
 102 /* Index within `registers' of the first byte of the space for
 103    register N.  */
 104
 105 #define REGISTER_BYTE(N)  ((N) * 4)
 106
 107 /* Number of bytes of storage in the actual machine representation
 108    for register N.  On the H8/300, all regs are 2 bytes.  */
 109
 110 #define REGISTER_RAW_SIZE(N) (h8300hmode ? 4 : 2)
 111
 112 /* Number of bytes of storage in the program's representation
 113    for register N.  */
 114
 115 #define REGISTER_VIRTUAL_SIZE(N) (h8300hmode ? 4 : 2)
 116
 117 /* Largest value REGISTER_RAW_SIZE can have.  */
 118
 119 #define MAX_REGISTER_RAW_SIZE 4
 120
 121 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 122
 123 #define MAX_REGISTER_VIRTUAL_SIZE 4
 124
 125 /* Return the GDB type object for the "standard" data type
 126    of data in register N.  */
 127
 128 #define REGISTER_VIRTUAL_TYPE(N) \
 129 (h8300hmode ? builtin_type_unsigned_long : builtin_type_unsigned_short)
 130
 131 /* Initializer for an array of names of registers.
 132    Entries beyond the first NUM_REGS are ignored.  */
 133
 134 #define REGISTER_NAMES \
 135   {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp", "ccr","pc","cycles","tick","inst"}
 136
 137 /* Register numbers of various important registers.
 138    Note that some of these values are "real" register numbers,
 139    and correspond to the general registers of the machine,
 140    and some are "phony" register numbers which are too large
 141    to be actual register numbers as far as the user is concerned
 142    but do serve to get the desired values when passed to read_register.  */
 143
 144 #define FP_REGNUM 6             /* Contains address of executing stack frame */
 145 #define SP_REGNUM 7             /* Contains address of top of stack */
 146 #define CCR_REGNUM 8            /* Contains processor status */
 147 #define PC_REGNUM 9             /* Contains program counter */
 148
 149 /* Extract from an array REGBUF containing the (raw) register state
 150    a function return value of type TYPE, and copy that, in virtual format,
 151    into VALBUF.  */
 152
 153 /* FIXME: Won't work with both h8/300's.  */
 154
 155 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 156   memcpy (VALBUF, (char *)(REGBUF), TYPE_LENGTH(TYPE))
 157
 158 /* Write into appropriate registers a function return value
 159    of type TYPE, given in virtual format.  Assumes floats are passed
 160    in d0/d1.  */
 161 /* FIXME: Won't work with both h8/300's.  */
 162
 163 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 164   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 165
 166 /* Extract from an array REGBUF containing the (raw) register state
 167    the address in which a function should return its structure value,
 168    as a CORE_ADDR (or an expression that can be used as one).  */
 169 /* FIXME: Won't work with both h8/300's.  */
 170
 171 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 172 \f
 173 /* Describe the pointer in each stack frame to the previous stack frame
 174    (its caller).  */
 175
 176 /* FRAME_CHAIN takes a frame's nominal address
 177    and produces the frame's chain-pointer.
 178
 179    However, if FRAME_CHAIN_VALID returns zero,
 180    it means the given frame is the outermost one and has no caller.  */
 181
 182 #define FRAME_CHAIN(FRAME) h8300_frame_chain(FRAME)
 183 struct frame_info ;
 184 CORE_ADDR h8300_frame_chain PARAMS ((struct frame_info *));
 185
 186 /* In the case of the H8/300, the frame's nominal address
 187    is the address of a 2-byte word containing the calling frame's address.  */
 188
 189 /* Use the alternate method of avoiding running up off the end of
 190    the frame chain or following frames back into the startup code.
 191    See the comments in objfile.h */
 192
 193 #define FRAME_CHAIN_VALID_ALTERNATE
 194
 195 /* Define other aspects of the stack frame.  */
 196
 197 /* A macro that tells us whether the function invocation represented
 198    by FI does not have a frame on the stack associated with it.  If it
 199    does not, FRAMELESS is set to 1, else 0.  */
 200 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 201   (FRAMELESS) = frameless_look_for_prologue(FI)
 202
 203 /* Any function with a frame looks like this
 204    SECOND ARG
 205    FIRST ARG
 206    RET PC
 207    SAVED R2
 208    SAVED R3
 209    SAVED FP   <-FP POINTS HERE
 210    LOCALS0
 211    LOCALS1    <-SP POINTS HERE
 212    */
 213
 214 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 215
 216 #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi)
 217
 218 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi);
 219
 220 /* Set VAL to the number of args passed to frame described by FI.
 221    Can set VAL to -1, meaning no way to tell.  */
 222
 223 /* We can't tell how many args there are
 224    now that the C compiler delays popping them.  */
 225
 226 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 227
 228 /* Return number of bytes at start of arglist that are not really args.  */
 229
 230 #define FRAME_ARGS_SKIP 0
 231
 232 /* Put here the code to store, into a struct frame_saved_regs,
 233    the addresses of the saved registers of frame described by FRAME_INFO.
 234    This includes special registers such as pc and fp saved in special
 235    ways in the stack frame.  sp is even more special:
 236    the address we return for it IS the sp for the next frame.  */
 237
 238 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)         \
 239    frame_find_saved_regs(frame_info, &(frame_saved_regs))
 240 \f
 241
 242 /* Push an empty stack frame, to record the current PC, etc.  */
 243
 244 /*#define PUSH_DUMMY_FRAME      { h8300_push_dummy_frame (); }*/
 245
 246 /* Discard from the stack the innermost frame, restoring all registers.  */
 247
 248 #define POP_FRAME               { h8300_pop_frame (); }
 249
 250 typedef unsigned short INSN_WORD;
 251
 252
 253 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
 254
 255 #define GDB_TARGET_IS_H8300
 256
 257 #define NUM_REALREGS 10
 258 #define NOP { 0x01, 0x80} /* A sleep insn */