gdb/config/w65/tm-w65.h

   1 /* Parameters for execution on a WDC 65816 machine.
   2    Copyright 1995, 1998, 1999, 2000 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,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "regcache.h"
  22
  23 /* Contributed by Steve Chamberlain sac@cygnus.com */
  24
  25 #define GDB_TARGET_IS_W65
  26
  27 #define IEEE_FLOAT (1)
  28
  29 /* Define the bit, byte, and word ordering of the machine.  */
  30
  31 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
  32
  33
  34 /* Offset from address of function to start of its code.
  35    Zero on most machines.  */
  36
  37 #define FUNCTION_START_OFFSET 0
  38
  39 /* Advance PC across any function entry prologue instructions
  40    to reach some "real" code.  */
  41
  42 extern CORE_ADDR w65_skip_prologue ();
  43
  44 #define SKIP_PROLOGUE(ip) \
  45     {(ip) = w65_skip_prologue(ip);}
  46
  47
  48 /* Immediately after a function call, return the saved pc.
  49    Can't always go through the frames for this because on some machines
  50    the new frame is not set up until the new function executes
  51    some instructions.
  52
  53    The return address is the value saved in the PR register + 4  */
  54
  55 #define SAVED_PC_AFTER_CALL(frame) \
  56   saved_pc_after_call(frame)
  57
  58
  59 /* Stack grows downward.  */
  60
  61 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  62
  63 /* Illegal instruction - used by the simulator for breakpoint
  64    detection */
  65
  66 #define BREAKPOINT {0xcb}       /* WAI */
  67
  68 /* If your kernel resets the pc after the trap happens you may need to
  69    define this before including this file.  */
  70 #define DECR_PC_AFTER_BREAK 0
  71
  72 /* Return 1 if P points to an invalid floating point value.  */
  73
  74 #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
  75
  76 /* Say how long registers are.  */
  77 /*#define REGISTER_TYPE  int */
  78
  79 /* Say how much memory is needed to store a copy of the register set */
  80 #define REGISTER_BYTES    (NUM_REGS*4)
  81
  82 /* Index within `registers' of the first byte of the space for
  83    register N.  */
  84
  85 #define REGISTER_BYTE(N)  ((N)*4)
  86
  87 /* Number of bytes of storage in the actual machine representation
  88    for register N.  */
  89
  90 #define REGISTER_RAW_SIZE(N)     (((N) < 16) ? 2 : 4)
  91
  92 #define REGISTER_VIRTUAL_SIZE(N)  REGISTER_RAW_SIZE(N)
  93
  94 /* Largest value REGISTER_RAW_SIZE can have.  */
  95
  96 #define MAX_REGISTER_RAW_SIZE 4
  97
  98 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
  99
 100 #define MAX_REGISTER_VIRTUAL_SIZE 4
 101
 102 /* Return the GDB type object for the "standard" data type
 103    of data in register N.  */
 104
 105 #define REGISTER_VIRTUAL_TYPE(N) \
 106   (REGISTER_VIRTUAL_SIZE(N) == 2 ? builtin_type_unsigned_short : builtin_type_unsigned_long)
 107
 108 /* Initializer for an array of names of registers.
 109    Entries beyond the first NUM_REGS are ignored.  */
 110
 111 #define REGISTER_NAMES \
 112   {"r0","r1","r2", "r3", "r4", "r5", "r6", "r7",  \
 113    "r8","r9","r10","r11","r12","r13","r14","r15", \
 114    "pc","a", "x",  "y",  "dbr","d",  "s",  "p",   \
 115    "ticks","cycles","insts"}
 116
 117 /* Register numbers of various important registers.
 118    Note that some of these values are "real" register numbers,
 119    and correspond to the general registers of the machine,
 120    and some are "phony" register numbers which are too large
 121    to be actual register numbers as far as the user is concerned
 122    but do serve to get the desired values when passed to read_register.  */
 123
 124 #define SP_REGNUM  22
 125 #define FP_REGNUM  15
 126 #define NUM_REGS   27
 127 #define PC_REGNUM  16
 128 #define P_REGNUM   23
 129
 130 /* Store the address of the place in which to copy the structure the
 131    subroutine will return.  This is called from call_function.
 132
 133    We store structs through a pointer passed in R4 */
 134
 135 #define STORE_STRUCT_RETURN(ADDR, SP) \
 136     { write_register (4, (ADDR));  }
 137
 138 /* Extract from an array REGBUF containing the (raw) register state
 139    a function return value of type TYPE, and copy that, in virtual format,
 140    into VALBUF.  */
 141
 142 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 143   memcpy (VALBUF, (char *)(REGBUF), TYPE_LENGTH(TYPE))
 144
 145
 146 /* Write into appropriate registers a function return value
 147    of type TYPE, given in virtual format.
 148
 149    Things always get returned in R4/R5 */
 150
 151 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 152   write_register_bytes (REGISTER_BYTE(4), VALBUF, TYPE_LENGTH (TYPE))
 153
 154
 155 /* Extract from an array REGBUF containing the (raw) register state
 156    the address in which a function should return its structure value,
 157    as a CORE_ADDR (or an expression that can be used as one).  */
 158
 159 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 160
 161 /* A macro that tells us whether the function invocation represented
 162    by FI does not have a frame on the stack associated with it.  If it
 163    does not, FRAMELESS is set to 1, else 0.  */
 164
 165 #define FRAMELESS_FUNCTION_INVOCATION(FI) \
 166   (frameless_look_for_prologue (FI))
 167
 168 #define FRAME_CHAIN(FRAME)       w65_frame_chain(FRAME)
 169 #define FRAME_SAVED_PC(FRAME)    (w65_frame_saved_pc(FRAME))
 170 #define FRAME_ARGS_ADDRESS(fi)   (fi)->frame
 171 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
 172
 173 /* Set VAL to the number of args passed to frame described by FI.
 174    Can set VAL to -1, meaning no way to tell.  */
 175
 176 /* We can't tell how many args there are */
 177
 178 #define FRAME_NUM_ARGS(fi) (-1)
 179
 180 /* Return number of bytes at start of arglist that are not really args.  */
 181
 182 #define FRAME_ARGS_SKIP 0
 183
 184 /* Put here the code to store, into a struct frame_saved_regs,
 185    the addresses of the saved registers of frame described by FRAME_INFO.
 186    This includes special registers such as pc and fp saved in special
 187    ways in the stack frame.  sp is even more special:
 188    the address we return for it IS the sp for the next frame.  */
 189
 190 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)         \
 191    frame_find_saved_regs(frame_info, &(frame_saved_regs))
 192
 193 typedef unsigned short INSN_WORD;
 194
 195 extern CORE_ADDR w65_addr_bits_remove (CORE_ADDR);
 196 #define ADDR_BITS_REMOVE(addr) w65_addr_bits_remove (addr)
 197
 198 #define CALL_DUMMY_LENGTH 10
 199
 200 /* Discard from the stack the innermost frame,
 201    restoring all saved registers.  */
 202
 203 #define POP_FRAME pop_frame();
 204
 205
 206 #define NOP   {0xea}
 207
 208 #define REGISTER_SIZE 4
 209
 210 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
 211
 212 #define TARGET_INT_BIT  16
 213 #define TARGET_LONG_BIT 32
 214 #define TARGET_PTR_BIT  32