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/* Parameters for execution on a z8000 series machine.

   Copyright 1992, 1993 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., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#define IEEE_FLOAT 1

#undef TARGET_INT_BIT

#undef TARGET_LONG_BIT

#undef TARGET_SHORT_BIT

#undef TARGET_PTR_BIT

#define TARGET_SHORT_BIT 16

#define TARGET_INT_BIT 16

#define TARGET_LONG_BIT 32

#define TARGET_PTR_BIT (BIG ? 32: 16)

/* Define the bit, byte, and word ordering of the machine.  */

#define TARGET_BYTE_ORDER BIG_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.  */

#define SKIP_PROLOGUE(ip)   (z8k_skip_prologue (ip))

extern CORE_ADDR z8k_skip_prologue PARAMS ((CORE_ADDR 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.  */

extern int z8k_saved_pc_after_call (struct frame_info *frame);

#define SAVED_PC_AFTER_CALL(frame) z8k_saved_pc_after_call(frame)

/* Stack grows downward.  */

#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))

/* Sequence of bytes for breakpoint instruction. */

#define BREAKPOINT {0x36,0x00}

/* 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

/* Say how long registers are.  */

#define REGISTER_TYPE unsigned int

#define NUM_REGS        23      /* 16 registers + 1 ccr + 1 pc + 3 debug

                                   regs + fake fp + fake sp */

#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.  On the z8k, all but the pc are 2 bytes, but we

   keep them all as 4 bytes and trim them on I/O */

#define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)

/* Number of bytes of storage in the program's representation

   for register N.  */

#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_int : builtin_type_long)

/*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y) */

/* 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", \

  "ccr", "pc", "cycles","insts","time","fp","sp"}

/* 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 CCR_REGNUM      16      /* Contains processor status */

#define PC_REGNUM       17      /* Contains program counter */

#define CYCLES_REGNUM   18

#define INSTS_REGNUM    19

#define TIME_REGNUM     20

#define FP_REGNUM       21      /* Contains fp, whatever memory model */

#define SP_REGNUM       22      /* Conatins sp, whatever memory model */

#define PTR_SIZE (BIG ? 4: 2)

#define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)

/* Store the address of the place in which to copy the structure the

   subroutine will return.  This is called from call_function. */

#define STORE_STRUCT_RETURN(ADDR, SP) abort();

/* 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.  This is assuming that floating point values are returned

   as doubles in d0/d1.  */

#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \

  memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), TYPE_LENGTH(TYPE));

/* Write into appropriate registers a function return value

   of type TYPE, given in virtual format. */

#define STORE_RETURN_VALUE(TYPE,VALBUF) abort();

/* 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))

/* Describe the pointer in each stack frame to the previous stack frame

   (its caller).  */

/* FRAME_CHAIN takes a frame's nominal address and produces the frame's

   chain-pointer.

   In the case of the Z8000, the frame's nominal address

   is the address of a ptr sized byte word containing the calling

   frame's address.  */

extern CORE_ADDR z8k_frame_chain (struct frame_info *thisframe);

#define FRAME_CHAIN(thisframe) z8k_frame_chain(thisframe);

/* Define other aspects of the stack frame.  */

/* 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_look_for_prologue (FI))

extern CORE_ADDR z8k_frame_saved_pc (struct frame_info *frame);

#define FRAME_SAVED_PC(FRAME) z8k_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

   now that the C compiler delays popping them.  */

#if !defined (FRAME_NUM_ARGS)

#define FRAME_NUM_ARGS(fi) (-1)

#endif

/* Return number of bytes at start of arglist that are not really args.  */

#define FRAME_ARGS_SKIP 8

struct frame_info;

extern void z8k_frame_init_saved_regs PARAMS ((struct frame_info *));

#define FRAME_INIT_SAVED_REGS(fi) z8k_frame_init_saved_regs (fi)

/* Things needed for making the inferior call functions.

   It seems like every m68k based machine has almost identical definitions

   in the individual machine's configuration files.  Most other cpu types

   (mips, i386, etc) have routines in their *-tdep.c files to handle this

   for most configurations.  The m68k family should be able to do this as

   well.  These macros can still be overridden when necessary.  */

/* The CALL_DUMMY macro is the sequence of instructions, as disassembled

   by gdb itself:

   fmovemx fp0-fp7,sp@-                 0xf227 0xe0ff

   moveml d0-a5,sp@-                    0x48e7 0xfffc

   clrw sp@-                            0x4267

   movew ccr,sp@-                               0x42e7

   /..* The arguments are pushed at this point by GDB;

   no code is needed in the dummy for this.

   The CALL_DUMMY_START_OFFSET gives the position of

   the following jsr instruction.  *../

   jsr @#0x32323232                     0x4eb9 0x3232 0x3232

   addal #0x69696969,sp                 0xdffc 0x6969 0x6969

   trap #<your BPT_VECTOR number here>  0x4e4?

   nop                                  0x4e71

   Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).

   We actually start executing at the jsr, since the pushing of the

   registers is done by PUSH_DUMMY_FRAME.  If this were real code,

   the arguments for the function called by the jsr would be pushed

   between the moveml and the jsr, and we could allow it to execute through.

   But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is

   done, and we cannot allow the moveml to push the registers again lest

   they be taken for the arguments.  */

#define CALL_DUMMY { 0 }

#define CALL_DUMMY_LENGTH 24    /* Size of CALL_DUMMY */

#define CALL_DUMMY_START_OFFSET 8       /* Offset to jsr instruction */

/* Insert the specified number of args and function address

   into a call sequence of the above form stored at DUMMYNAME.

   We use the BFD routines to store a big-endian value of known size.  */

#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \

{ bfd_putb32 (fun,     (char *) dummyname + CALL_DUMMY_START_OFFSET + 2);  \

  bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }

/* Push an empty stack frame, to record the current PC, etc.  */

#define PUSH_DUMMY_FRAME        { z8k_push_dummy_frame (); }

extern void z8k_push_dummy_frame PARAMS ((void));

extern void z8k_pop_frame PARAMS ((void));

/* Discard from the stack the innermost frame, restoring all registers.  */

#define POP_FRAME               { z8k_pop_frame (); }

/* Offset from SP to first arg on stack at first instruction of a function */

#define SP_ARG0 (1 * 4)

extern CORE_ADDR z8k_addr_bits_remove PARAMS ((CORE_ADDR));

#define ADDR_BITS_REMOVE(addr) z8k_addr_bits_remove (addr)

int sim_z8001_mode;

#define BIG (sim_z8001_mode)

#define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)

#define NO_STD_REGS

extern void z8k_print_register_hook (int regno);

#define PRINT_REGISTER_HOOK(regno) z8k_print_register_hook(regno)

extern void z8k_set_pointer_size (int newsize);

#define INIT_EXTRA_SYMTAB_INFO \

  z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);

#define REGISTER_SIZE 4