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 #ifdef __STDC__
  23 struct frame_info;
  24 struct frame_saved_regs;
  25 struct value;
  26 struct type;
  27 #endif
  28
  29 /* 1 if debugging H8/300H application */
  30 extern int h8300hmode;
  31 extern int h8300smode;
  32
  33 /* Number of bytes in a word */
  34
  35 #define BINWORD (h8300hmode?4:2)
  36
  37 #define EXTRA_FRAME_INFO        \
  38         struct frame_saved_regs *fsr;   \
  39         CORE_ADDR from_pc; \
  40         CORE_ADDR args_pointer;\
  41         CORE_ADDR locals_pointer ;
  42
  43 /* Zero the frame_saved_regs pointer when the frame is initialized,
  44    so that FRAME_FIND_SAVED_REGS () will know to allocate and
  45    initialize a frame_saved_regs struct the first time it is called.
  46    Set the arg_pointer to -1, which is not valid; 0 and other values
  47    indicate real, cached values.  */
  48
  49 #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
  50         h8300_init_extra_frame_info (fromleaf, fi)
  51
  52 extern void h8300_init_extra_frame_info ();
  53
  54 #define IEEE_FLOAT
  55 /* Define the bit, byte, and word ordering of the machine.  */
  56 #define TARGET_BYTE_ORDER BIG_ENDIAN
  57 #undef TARGET_INT_BIT
  58 #define TARGET_INT_BIT  16
  59 #undef TARGET_LONG_BIT
  60 #define TARGET_LONG_BIT  32
  61 #undef TARGET_PTR_BIT
  62 #define TARGET_PTR_BIT  (h8300hmode ? 32:16)
  63
  64 /* Offset from address of function to start of its code.
  65    Zero on most machines.  */
  66
  67 #define FUNCTION_START_OFFSET 0
  68
  69 /* Advance PC across any function entry prologue instructions
  70    to reach some "real" code.  */
  71
  72 #define SKIP_PROLOGUE(ip)   {(ip) = h8300_skip_prologue(ip);}
  73 extern CORE_ADDR h8300_skip_prologue ();
  74
  75 /* Immediately after a function call, return the saved pc.
  76    Can't always go through the frames for this because on some machines
  77    the new frame is not set up until the new function executes
  78    some instructions.  */
  79
  80 #define SAVED_PC_AFTER_CALL(frame) \
  81   read_memory_unsigned_integer (read_register (SP_REGNUM), BINWORD)
  82
  83 /* Stack grows downward.  */
  84
  85 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  86
  87 /*#define BREAKPOINT {0x7A, 0xFF}*/
  88 #define BREAKPOINT {0x01, 0x80}  /* Sleep */
  89 #define REMOTE_BREAKPOINT { 0x57, 0x30}  /* trapa #3 */
  90 /* If your kernel resets the pc after the trap happens you may need to
  91    define this before including this file.    */
  92
  93 #define DECR_PC_AFTER_BREAK 0
  94
  95 /* Say how long registers are.  */
  96
  97 #define REGISTER_SIZE 4
  98
  99 #define NUM_REGS 13
 100
 101 #define REGISTER_BYTES (NUM_REGS * 4)
 102
 103 /* Index within `registers' of the first byte of the space for
 104    register N.  */
 105
 106 #define REGISTER_BYTE(N)  ((N) * 4)
 107
 108 /* Number of bytes of storage in the actual machine representation
 109    for register N.  On the H8/300, all regs are 2 bytes.  */
 110
 111 #define REGISTER_RAW_SIZE(N) (h8300hmode ? 4 : 2)
 112
 113 /* Number of bytes of storage in the program's representation
 114    for register N.  */
 115
 116 #define REGISTER_VIRTUAL_SIZE(N) (h8300hmode ? 4 : 2)
 117
 118 /* Largest value REGISTER_RAW_SIZE can have.  */
 119
 120 #define MAX_REGISTER_RAW_SIZE 4
 121
 122 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 123
 124 #define MAX_REGISTER_VIRTUAL_SIZE 4
 125
 126 /* Return the GDB type object for the "standard" data type
 127    of data in register N.  */
 128
 129 #define REGISTER_VIRTUAL_TYPE(N) \
 130 (h8300hmode ? builtin_type_unsigned_long : builtin_type_unsigned_short)
 131
 132 /* Initializer for an array of names of registers.
 133    Entries beyond the first NUM_REGS are ignored.  */
 134
 135 #define REGISTER_NAMES \
 136   {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp", "ccr","pc","cycles","tick","inst"}
 137
 138 /* Register numbers of various important registers.
 139    Note that some of these values are "real" register numbers,
 140    and correspond to the general registers of the machine,
 141    and some are "phony" register numbers which are too large
 142    to be actual register numbers as far as the user is concerned
 143    but do serve to get the desired values when passed to read_register.  */
 144
 145 #define ARG0_REGNUM    0        /* first reg in which an arg may be passed */
 146 #define ARGLAST_REGNUM 2        /* last  reg in which an arg may be passed */
 147 #define FP_REGNUM      6        /* Contain saddress 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 extern void h8300_extract_return_value PARAMS((struct type *, char *, char *));
 159 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 160     h8300_extract_return_value (TYPE, (char *)(REGBUF), (char *)(VALBUF))
 161
 162 /* Write into appropriate registers a function return value
 163    of type TYPE, given in virtual format.  Assumes floats are passed
 164    in d0/d1.  */
 165 /* FIXME: Won't work with both h8/300's.  */
 166
 167 extern void h8300_store_return_value PARAMS((struct type *, char *));
 168 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 169     h8300_store_return_value(TYPE, (char *) (VALBUF))
 170
 171 /* struct passing and returning stuff */
 172 #define STORE_STRUCT_RETURN(STRUCT_ADDR, SP)    \
 173         write_register (0, STRUCT_ADDR)
 174
 175 #define USE_STRUCT_CONVENTION(gcc_p, type)      (1)
 176
 177 /* Extract from an array REGBUF containing the (raw) register state
 178    the address in which a function should return its structure value,
 179    as a CORE_ADDR (or an expression that can be used as one).  */
 180
 181 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
 182      extract_address (REGBUF + REGISTER_BYTE (0), \
 183                       REGISTER_RAW_SIZE (0))
 184
 185 /* Describe the pointer in each stack frame to the previous stack frame
 186    (its caller).  */
 187
 188 /* FRAME_CHAIN takes a frame's nominal address
 189    and produces the frame's chain-pointer.
 190
 191    However, if FRAME_CHAIN_VALID returns zero,
 192    it means the given frame is the outermost one and has no caller.  */
 193
 194 #define FRAME_CHAIN(FRAME) h8300_frame_chain(FRAME)
 195 CORE_ADDR h8300_frame_chain PARAMS ((struct frame_info *));
 196
 197 /* In the case of the H8/300, the frame's nominal address
 198    is the address of a 2-byte word containing the calling frame's address.  */
 199
 200 /* Use the alternate method of avoiding running up off the end of
 201    the frame chain or following frames back into the startup code.
 202    See the comments in objfile.h */
 203
 204 #define FRAME_CHAIN_VALID_ALTERNATE
 205
 206 /* Define other aspects of the stack frame.  */
 207
 208 /* A macro that tells us whether the function invocation represented
 209    by FI does not have a frame on the stack associated with it.  If it
 210    does not, FRAMELESS is set to 1, else 0.  */
 211 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 212   (FRAMELESS) = frameless_look_for_prologue(FI)
 213
 214 /* Any function with a frame looks like this
 215    SECOND ARG
 216    FIRST ARG
 217    RET PC
 218    SAVED R2
 219    SAVED R3
 220    SAVED FP   <-FP POINTS HERE
 221    LOCALS0
 222    LOCALS1    <-SP POINTS HERE
 223    */
 224
 225 #define FRAME_SAVED_PC(FRAME) h8300_frame_saved_pc(FRAME)
 226
 227 #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi)
 228
 229 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi);
 230
 231 /* Set VAL to the number of args passed to frame described by FI.
 232    Can set VAL to -1, meaning no way to tell.  */
 233
 234 /* We can't tell how many args there are
 235    now that the C compiler delays popping them.  */
 236
 237 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 238
 239 /* Return number of bytes at start of arglist that are not really args.  */
 240
 241 #define FRAME_ARGS_SKIP 0
 242
 243 /* Put here the code to store, into a struct frame_saved_regs,
 244    the addresses of the saved registers of frame described by FRAME_INFO.
 245    This includes special registers such as pc and fp saved in special
 246    ways in the stack frame.  sp is even more special:
 247    the address we return for it IS the sp for the next frame.  */
 248
 249 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)         \
 250    h8300_frame_find_saved_regs(frame_info, &(frame_saved_regs))
 251 \f
 252
 253 typedef unsigned short INSN_WORD;
 254
 255
 256 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
 257
 258 #define GDB_TARGET_IS_H8300
 259
 260 #define NUM_REALREGS 10
 261 #define NOP { 0x01, 0x80} /* A sleep insn */
 262
 263 #define BELIEVE_PCC_PROMOTION 1
 264
 265 /*
 266  * CALL_DUMMY stuff:
 267  */
 268
 269 #define USE_GENERIC_DUMMY_FRAMES
 270 #define CALL_DUMMY                      {0}
 271 #define CALL_DUMMY_LENGTH               (0)
 272 #define CALL_DUMMY_ADDRESS()            entry_point_address ()
 273 #define CALL_DUMMY_LOCATION             AT_ENTRY_POINT
 274 #define CALL_DUMMY_START_OFFSET         (0)
 275 #define CALL_DUMMY_BREAKPOINT_OFFSET    (0)
 276
 277 extern CORE_ADDR h8300_push_arguments PARAMS ((int nargs,
 278                                                struct value **args,
 279                                                CORE_ADDR sp,
 280                                                unsigned char struct_return,
 281                                                CORE_ADDR struct_addr));
 282 extern CORE_ADDR h8300_push_return_address PARAMS ((CORE_ADDR, CORE_ADDR));
 283
 284 #define PC_IN_CALL_DUMMY(PC, SP, FP)    generic_pc_in_call_dummy (PC, SP)
 285 #define FIX_CALL_DUMMY(DUMMY, START_SP, FUNADDR, NARGS, ARGS, TYPE, GCCP)
 286 #define PUSH_ARGUMENTS(NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR) \
 287   (SP) = h8300_push_arguments (NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR)
 288 /* Push an empty stack frame, to record the current PC, etc.  */
 289 #define PUSH_DUMMY_FRAME        generic_push_dummy_frame ()
 290 /* Discard from the stack the innermost frame, restoring all registers.  */
 291 #define POP_FRAME               h8300_pop_frame ()
 292 #define PUSH_RETURN_ADDRESS(PC, SP)     h8300_push_return_address (PC, SP)
 293
 294 /* override the standard get_saved_register function with
 295    one that takes account of generic CALL_DUMMY frames */
 296 #define GET_SAVED_REGISTER
 297
 298