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 #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
  82 /* If your kernel resets the pc after the trap happens you may need to
  83    define this before including this file.  */
  84
  85 #define DECR_PC_AFTER_BREAK 2
  86
  87 /* Nonzero if instruction at PC is a return instruction.  */
  88 /* Allow any of the return instructions, including a trapv and a return
  89    from interupt.  */
  90
  91 #define ABOUT_TO_RETURN(pc) ((read_memory_unsigned_integer (pc, 2) & ~0x3) == 0x4e74)
  92
  93 /* Return 1 if P points to an invalid floating point value.  */
  94
  95 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
  96
  97 /* Say how long registers are.  */
  98
  99 #define REGISTER_TYPE  unsigned short
 100
 101 #define NUM_REGS 13
 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 /* Return the GDB type object for the "standard" data type
 129    of data in register N.  */
 130
 131 #define REGISTER_VIRTUAL_TYPE(N) \
 132 (h8300hmode ? builtin_type_unsigned_long : builtin_type_unsigned_short)
 133
 134 /* Initializer for an array of names of registers.
 135    Entries beyond the first NUM_REGS are ignored.  */
 136
 137 #define REGISTER_NAMES \
 138   {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp", "ccr","pc","cycles","tick","inst"}
 139
 140 /* Register numbers of various important registers.
 141    Note that some of these values are "real" register numbers,
 142    and correspond to the general registers of the machine,
 143    and some are "phony" register numbers which are too large
 144    to be actual register numbers as far as the user is concerned
 145    but do serve to get the desired values when passed to read_register.  */
 146
 147 #define FP_REGNUM 6             /* Contains address of executing stack frame */
 148 #define SP_REGNUM 7             /* Contains address of top of stack */
 149 #define CCR_REGNUM 8            /* Contains processor status */
 150 #define PC_REGNUM 9             /* Contains program counter */
 151
 152 /* Extract from an array REGBUF containing the (raw) register state
 153    a function return value of type TYPE, and copy that, in virtual format,
 154    into VALBUF.  */
 155
 156 /* FIXME: Won't work with both h8/300's.  */
 157
 158 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 159   memcpy (VALBUF, (char *)(REGBUF), TYPE_LENGTH(TYPE))
 160
 161 /* Write into appropriate registers a function return value
 162    of type TYPE, given in virtual format.  Assumes floats are passed
 163    in d0/d1.  */
 164 /* FIXME: Won't work with both h8/300's.  */
 165
 166 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 167   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 168
 169 /* Extract from an array REGBUF containing the (raw) register state
 170    the address in which a function should return its structure value,
 171    as a CORE_ADDR (or an expression that can be used as one).  */
 172 /* FIXME: Won't work with both h8/300's.  */
 173
 174 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 175 \f
 176 /* Describe the pointer in each stack frame to the previous stack frame
 177    (its caller).  */
 178
 179 /* FRAME_CHAIN takes a frame's nominal address
 180    and produces the frame's chain-pointer.
 181
 182    However, if FRAME_CHAIN_VALID returns zero,
 183    it means the given frame is the outermost one and has no caller.  */
 184
 185 /* In the case of the H8/300, the frame's nominal address
 186    is the address of a 2-byte word containing the calling frame's address.  */
 187
 188 /* Use the alternate method of avoiding running up off the end of
 189    the frame chain or following frames back into the startup code.
 190    See the comments in objfile.h */
 191
 192 #define FRAME_CHAIN_VALID_ALTERNATE
 193
 194 /* Define other aspects of the stack frame.  */
 195
 196 /* A macro that tells us whether the function invocation represented
 197    by FI does not have a frame on the stack associated with it.  If it
 198    does not, FRAMELESS is set to 1, else 0.  */
 199 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 200   (FRAMELESS) = frameless_look_for_prologue(FI)
 201
 202 /* Any function with a frame looks like this
 203    SECOND ARG
 204    FIRST ARG
 205    RET PC
 206    SAVED R2
 207    SAVED R3
 208    SAVED FP   <-FP POINTS HERE
 209    LOCALS0
 210    LOCALS1    <-SP POINTS HERE
 211    */
 212
 213 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 214
 215 #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi)
 216
 217 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi);
 218
 219 /* Set VAL to the number of args passed to frame described by FI.
 220    Can set VAL to -1, meaning no way to tell.  */
 221
 222 /* We can't tell how many args there are
 223    now that the C compiler delays popping them.  */
 224
 225 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 226
 227 /* Return number of bytes at start of arglist that are not really args.  */
 228
 229 #define FRAME_ARGS_SKIP 0
 230
 231 /* Put here the code to store, into a struct frame_saved_regs,
 232    the addresses of the saved registers of frame described by FRAME_INFO.
 233    This includes special registers such as pc and fp saved in special
 234    ways in the stack frame.  sp is even more special:
 235    the address we return for it IS the sp for the next frame.  */
 236
 237 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)         \
 238    frame_find_saved_regs(frame_info, &(frame_saved_regs))
 239 \f
 240
 241 /* Push an empty stack frame, to record the current PC, etc.  */
 242
 243 /*#define PUSH_DUMMY_FRAME      { h8300_push_dummy_frame (); }*/
 244
 245 /* Discard from the stack the innermost frame, restoring all registers.  */
 246
 247 #define POP_FRAME               { h8300_pop_frame (); }
 248
 249 typedef unsigned short INSN_WORD;
 250
 251
 252 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
 253
 254 #define GDB_TARGET_IS_H8300
 255
 256 #define NUM_REALREGS 10
 257 #define NOP {0,0}