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