gdb/config/w65/tm-w65.h

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