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- /* Parameters for execution on a WDC 65816 machine.
- Copyright (C) 1995 Free Software Foundation, Inc.
-
- This file is part of GDB.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Contributed by Steve Chamberlain sac@cygnus.com */
-
- #define GDB_TARGET_IS_W65
-
- #define IEEE_FLOAT 1
-
- /* Define the bit, byte, and word ordering of the machine. */
-
- #define TARGET_BYTE_ORDER LITTLE_ENDIAN
-
-
- /* Offset from address of function to start of its code.
- Zero on most machines. */
-
- #define FUNCTION_START_OFFSET 0
-
- /* Advance PC across any function entry prologue instructions
- to reach some "real" code. */
-
- extern CORE_ADDR w65_skip_prologue ();
-
- #define SKIP_PROLOGUE(ip) \
- {(ip) = w65_skip_prologue(ip);}
-
-
- /* Immediately after a function call, return the saved pc.
- Can't always go through the frames for this because on some machines
- the new frame is not set up until the new function executes
- some instructions.
-
- The return address is the value saved in the PR register + 4 */
-
- #define SAVED_PC_AFTER_CALL(frame) \
- saved_pc_after_call(frame)
-
-
- /* Stack grows downward. */
-
- #define INNER_THAN <
-
- /* Illegal instruction - used by the simulator for breakpoint
- detection */
-
- #define BREAKPOINT {0xcb} /* WAI */
-
- /* If your kernel resets the pc after the trap happens you may need to
- define this before including this file. */
- #define DECR_PC_AFTER_BREAK 0
-
- /* Nonzero if instruction at PC is a return instruction. */
-
- #define ABOUT_TO_RETURN(pc) \
- (read_memory_integer(pc,1) == RTL || read_memory_integer(pc,1) == RTS)
-
- #define RTL 0x6b
- #define RTS 0x60
-
- /* Return 1 if P points to an invalid floating point value. */
-
- #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
-
- /* Say how long registers are. */
- /*#define REGISTER_TYPE int*/
-
- /* Say how much memory is needed to store a copy of the register set */
- #define REGISTER_BYTES (NUM_REGS*4)
-
- /* Index within `registers' of the first byte of the space for
- register N. */
-
- #define REGISTER_BYTE(N) ((N)*4)
-
- /* Number of bytes of storage in the actual machine representation
- for register N. */
-
- #define REGISTER_RAW_SIZE(N) (((N) < 16) ? 2 : 4)
-
- #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
-
- /* Largest value REGISTER_RAW_SIZE can have. */
-
- #define MAX_REGISTER_RAW_SIZE 4
-
- /* Largest value REGISTER_VIRTUAL_SIZE can have. */
-
- #define MAX_REGISTER_VIRTUAL_SIZE 4
-
- /* Return the GDB type object for the "standard" data type
- of data in register N. */
-
- #define REGISTER_VIRTUAL_TYPE(N) \
- (REGISTER_VIRTUAL_SIZE(N) == 2 ? builtin_type_unsigned_short : builtin_type_unsigned_long)
-
- /* Initializer for an array of names of registers.
- Entries beyond the first NUM_REGS are ignored. */
-
- #define REGISTER_NAMES \
- {"r0","r1","r2", "r3", "r4", "r5", "r6", "r7", \
- "r8","r9","r10","r11","r12","r13","r14","r15", \
- "pc","a", "x", "y", "dbr","d", "s", "p", \
- "ticks","cycles","insts"}
-
- /* Register numbers of various important registers.
- Note that some of these values are "real" register numbers,
- and correspond to the general registers of the machine,
- and some are "phony" register numbers which are too large
- to be actual register numbers as far as the user is concerned
- but do serve to get the desired values when passed to read_register. */
-
- #define SP_REGNUM 22
- #define FP_REGNUM 15
- #define NUM_REGS 27
- #define PC_REGNUM 16
- #define P_REGNUM 23
-
- /* Store the address of the place in which to copy the structure the
- subroutine will return. This is called from call_function.
-
- We store structs through a pointer passed in R4 */
-
- #define STORE_STRUCT_RETURN(ADDR, SP) \
- { write_register (4, (ADDR)); }
-
- /* Extract from an array REGBUF containing the (raw) register state
- a function return value of type TYPE, and copy that, in virtual format,
- into VALBUF. */
-
- #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
- memcpy (VALBUF, (char *)(REGBUF), TYPE_LENGTH(TYPE))
-
-
- /* Write into appropriate registers a function return value
- of type TYPE, given in virtual format.
-
- Things always get returned in R4/R5 */
-
- #define STORE_RETURN_VALUE(TYPE,VALBUF) \
- write_register_bytes (REGISTER_BYTE(4), VALBUF, TYPE_LENGTH (TYPE))
-
-
- /* Extract from an array REGBUF containing the (raw) register state
- the address in which a function should return its structure value,
- as a CORE_ADDR (or an expression that can be used as one). */
-
- #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
-
- /* A macro that tells us whether the function invocation represented
- by FI does not have a frame on the stack associated with it. If it
- does not, FRAMELESS is set to 1, else 0. */
-
- #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
- (FRAMELESS) = frameless_look_for_prologue(FI)
-
- #define FRAME_CHAIN(FRAME) w65_frame_chain(FRAME)
- #define FRAME_SAVED_PC(FRAME) (w65_frame_saved_pc(FRAME))
- #define FRAME_ARGS_ADDRESS(fi) (fi)->frame
- #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
-
- /* Set VAL to the number of args passed to frame described by FI.
- Can set VAL to -1, meaning no way to tell. */
-
- /* We can't tell how many args there are */
-
- #define FRAME_NUM_ARGS(val,fi) (val = -1)
-
- /* Return number of bytes at start of arglist that are not really args. */
-
- #define FRAME_ARGS_SKIP 0
-
- /* Put here the code to store, into a struct frame_saved_regs,
- the addresses of the saved registers of frame described by FRAME_INFO.
- This includes special registers such as pc and fp saved in special
- ways in the stack frame. sp is even more special:
- the address we return for it IS the sp for the next frame. */
-
- #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
- frame_find_saved_regs(frame_info, &(frame_saved_regs))
-
- #define NAMES_HAVE_UNDERSCORE
-
- typedef unsigned short INSN_WORD;
-
- #define ADDR_BITS_REMOVE(addr) ((addr) & 0xffffff)
-
- #define CALL_DUMMY_LENGTH 10
-
- /* Discard from the stack the innermost frame,
- restoring all saved registers. */
-
- #define POP_FRAME pop_frame();
-
-
- #define NOP {0xea}
-
- #define REGISTER_SIZE 4
-
- #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
-
- #define TARGET_INT_BIT 16
- #define TARGET_LONG_BIT 32
- #define TARGET_PTR_BIT 32
-