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 HMODE;
  23
  24 #define BINWORD (HMODE?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  (HMODE ? 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 /*#  define NUM_REGS 20 /* 20 for fake HW support */
  98 #define NUM_REGS 13
  99 #define REGISTER_BYTES (NUM_REGS * 4)
 100
 101 /* Index within `registers' of the first byte of the space for
 102    register N.  */
 103
 104 #define REGISTER_BYTE(N)  ((N) * 4)
 105
 106 /* Number of bytes of storage in the actual machine representation
 107    for register N.  On the H8/300, all regs are 2 bytes.  */
 108
 109 #define REGISTER_RAW_SIZE(N) (HMODE ? 4 : 2)
 110
 111 /* Number of bytes of storage in the program's representation
 112    for register N.  */
 113
 114 #define REGISTER_VIRTUAL_SIZE(N) (HMODE ? 4 : 2)
 115
 116 /* Largest value REGISTER_RAW_SIZE can have.  */
 117
 118 #define MAX_REGISTER_RAW_SIZE 4
 119
 120 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 121
 122 #define MAX_REGISTER_VIRTUAL_SIZE 4
 123
 124 /* Nonzero if register N requires conversion
 125    from raw format to virtual format.  */
 126
 127 #define REGISTER_CONVERTIBLE(N) 0
 128
 129 /* Convert data from raw format for register REGNUM
 130    to virtual format for register REGNUM.  */
 131
 132 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
 133 { memcpy((TO), (FROM),  REGISTER_RAW_SIZE (REGNUM)); }
 134
 135 /* Convert data from virtual format for register REGNUM
 136    to raw format for register REGNUM.  */
 137
 138 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 139 { memcpy((TO), (FROM),  REGISTER_RAW_SIZE (REGNUM)); }
 140
 141 /* Return the GDB type object for the "standard" data type
 142    of data in register N.  */
 143
 144 #define REGISTER_VIRTUAL_TYPE(N) \
 145 (HMODE ? builtin_type_unsigned_long : builtin_type_unsigned_short)
 146
 147 /* Initializer for an array of names of registers.
 148    Entries beyond the first NUM_REGS are ignored.  */
 149
 150 #if NUM_REGS==20
 151 #define REGISTER_NAMES  \
 152  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp",\
 153   "ccr","pc","cycles","hcheck","tier","tcsr","frc",\
 154    "ocra","ocrb","tcr","tocr","icra"}
 155 #else
 156 #define REGISTER_NAMES \
 157   {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp", "ccr","pc","cycles","tick","inst"}
 158 #endif
 159
 160 /* Register numbers of various important registers.
 161    Note that some of these values are "real" register numbers,
 162    and correspond to the general registers of the machine,
 163    and some are "phony" register numbers which are too large
 164    to be actual register numbers as far as the user is concerned
 165    but do serve to get the desired values when passed to read_register.  */
 166
 167 #define FP_REGNUM 6             /* Contains address of executing stack frame */
 168 #define SP_REGNUM 7             /* Contains address of top of stack */
 169 #define CCR_REGNUM 8            /* Contains processor status */
 170 #define PC_REGNUM 9             /* Contains program counter */
 171
 172 /* Store the address of the place in which to copy the structure the
 173    subroutine will return.  This is called from call_function. */
 174
 175 /*#define STORE_STRUCT_RETURN(ADDR, SP) \
 176   { write_register (0, (ADDR)); abort(); }*/
 177
 178 /* Extract from an array REGBUF containing the (raw) register state
 179    a function return value of type TYPE, and copy that, in virtual format,
 180    into VALBUF.  */
 181 /* FIXME: Won't work with both h8/300's.  */
 182
 183 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 184   bcopy ((char *)(REGBUF), VALBUF, TYPE_LENGTH(TYPE))
 185
 186 /* Write into appropriate registers a function return value
 187    of type TYPE, given in virtual format.  Assumes floats are passed
 188    in d0/d1.  */
 189 /* FIXME: Won't work with both h8/300's.  */
 190
 191 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 192   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 193
 194 /* Extract from an array REGBUF containing the (raw) register state
 195    the address in which a function should return its structure value,
 196    as a CORE_ADDR (or an expression that can be used as one).  */
 197 /* FIXME: Won't work with both h8/300's.  */
 198
 199 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 200 \f
 201 /* Describe the pointer in each stack frame to the previous stack frame
 202    (its caller).  */
 203
 204 /* FRAME_CHAIN takes a frame's nominal address
 205    and produces the frame's chain-pointer.
 206
 207    However, if FRAME_CHAIN_VALID returns zero,
 208    it means the given frame is the outermost one and has no caller.  */
 209
 210 /* In the case of the H8/300, the frame's nominal address
 211    is the address of a 2-byte word containing the calling frame's address.  */
 212
 213 /* Use the alternate method of avoiding running up off the end of
 214    the frame chain or following frames back into the startup code.
 215    See the comments in objfile.h */
 216
 217 #define FRAME_CHAIN_VALID_ALTERNATE
 218
 219 /* Define other aspects of the stack frame.  */
 220
 221 /* A macro that tells us whether the function invocation represented
 222    by FI does not have a frame on the stack associated with it.  If it
 223    does not, FRAMELESS is set to 1, else 0.  */
 224 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 225   (FRAMELESS) = frameless_look_for_prologue(FI)
 226
 227 /* Any function with a frame looks like this
 228    SECOND ARG
 229    FIRST ARG
 230    RET PC
 231    SAVED R2
 232    SAVED R3
 233    SAVED FP   <-FP POINTS HERE
 234    LOCALS0
 235    LOCALS1    <-SP POINTS HERE
 236    */
 237
 238 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 239
 240 #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi)
 241
 242 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi);
 243
 244 /* Set VAL to the number of args passed to frame described by FI.
 245    Can set VAL to -1, meaning no way to tell.  */
 246
 247 /* We can't tell how many args there are
 248    now that the C compiler delays popping them.  */
 249
 250 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 251
 252 /* Return number of bytes at start of arglist that are not really args.  */
 253
 254 #define FRAME_ARGS_SKIP 0
 255
 256 /* Put here the code to store, into a struct frame_saved_regs,
 257    the addresses of the saved registers of frame described by FRAME_INFO.
 258    This includes special registers such as pc and fp saved in special
 259    ways in the stack frame.  sp is even more special:
 260    the address we return for it IS the sp for the next frame.  */
 261
 262 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)         \
 263    frame_find_saved_regs(frame_info, &(frame_saved_regs))
 264 \f
 265
 266 /* Push an empty stack frame, to record the current PC, etc.  */
 267
 268 /*#define PUSH_DUMMY_FRAME      { h8300_push_dummy_frame (); }*/
 269
 270 /* Discard from the stack the innermost frame, restoring all registers.  */
 271
 272 #define POP_FRAME               { h8300_pop_frame (); }
 273
 274 #define SHORT_INT_MAX 32767
 275 #define SHORT_INT_MIN -32768
 276
 277 #define BEFORE_MAIN_LOOP_HOOK   \
 278   hms_before_main_loop();
 279
 280 typedef unsigned short INSN_WORD;
 281
 282 #define ADDR_BITS_REMOVE(addr) ((addr) & 0xffff)
 283 #define ADDR_BITS_SET(addr) (((addr)))
 284
 285 #define DONT_USE_REMOTE
 286
 287 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)