[binutils.git] / gdb / tm-68k.h

/* Parameters for execution on a 68000 series machine.
   Copyright (C) 1986, 1987, 1989, 1990 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.  */

/* Generic 68000 stuff, to be included by other m-*.h files.
   Define HAVE_68881 if that is the case.  */

#if defined (HAVE_68881)
#define IEEE_FLOAT 1
#endif

/* 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(pc)   \
{ register int op = read_memory_integer (pc, 2);	\
  if (op == 0047126)					\
    pc += 4;   /* Skip link #word */			\
  else if (op == 0044016)				\
    pc += 6;   /* Skip link #long */			\
  /* Not sure why branches are here.  */                \
  /* From m-isi.h, m-altos.h */                         \
  else if (op == 0060000)				\
    pc += 4;   /* Skip bra #word */			\
  else if (op == 00600377)				\
    pc += 6;   /* skip bra #long */			\
  else if ((op & 0177400) == 0060000)			\
    pc += 2;   /* skip bra #char */			\
}

/* 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.  */

#define SAVED_PC_AFTER_CALL(frame) \
read_memory_integer (read_register (SP_REGNUM), 4)

/* Stack grows downward.  */

#define INNER_THAN <

/* Sequence of bytes for breakpoint instruction.
   This is a TRAP instruction.  The last 4 bits (0xf below) is the
   vector.  Systems which don't use 0xf should define BREAKPOINT
   themselves before including this file.  */

#if !defined (BREAKPOINT)
#define BREAKPOINT {0x4e, 0x4f}
#endif

/* If your kernel resets the pc after the trap happens you may need to
   define this in m-68k.h.  */

#if !defined (DECR_PC_AFTER_BREAK)
#define DECR_PC_AFTER_BREAK 2
#endif

/* Nonzero if instruction at PC is a return instruction.  */
/* Allow any of the return instructions, including a trapv and a return
   from interupt.  */

#define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 2) & ~0x3) == 0x4e74)

/* 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 long

#if defined (HAVE_68881)
#  if defined (GDB_TARGET_IS_SUN3)
    /* Sun3 status includes fpflags, which shows whether the FPU has been used
       by the process, and whether the FPU was done with an instruction or 
       was interrupted in the middle of a long instruction.  See
       <machine/reg.h>.  */
    /*                      a&d, pc,sr, fp, fpstat, fpflags   */
#    define NUM_REGS 31
#    define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4 + 4)
#  else /* Not sun3.  */
#    define NUM_REGS 29
#    define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4)
#  endif /* Not sun3.  */
#else /* No 68881.  */
#  define NUM_REGS 18
#  define REGISTER_BYTES (16*4 + 8)
#endif /* No 68881.  */

/* Index within `registers' of the first byte of the space for
   register N.  */

#if defined (HAVE_68881)
#define REGISTER_BYTE(N)  \
 ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168	\
  : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72	\
  : (N) * 4)

/* Number of bytes of storage in the actual machine representation
   for register N.  On the 68000, all regs are 4 bytes
   except the floating point regs which are 12 bytes.  */
/* Note that the unsigned cast here forces the result of the
   subtraction to very high positive values if N < FP0_REGNUM */

#define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4)

/* Number of bytes of storage in the program's representation
   for register N.  On the 68000, all regs are 4 bytes
   except the floating point regs which are 8-byte doubles.  */

#define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4)

/* Largest value REGISTER_RAW_SIZE can have.  */

#define MAX_REGISTER_RAW_SIZE 12

/* Largest value REGISTER_VIRTUAL_SIZE can have.  */

#define MAX_REGISTER_VIRTUAL_SIZE 8

/* Nonzero if register N requires conversion
   from raw format to virtual format.  */

#define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8)

/* Put the declaration out here because if it's in the macros, PCC
   will complain.  */
extern struct ext_format ext_format_68881;

/* Convert data from raw format for register REGNUM
   to virtual format for register REGNUM.  */

#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)	\
{ \
  if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)	\
    ieee_extended_to_double (&ext_format_68881, (FROM), (double *)(TO)); \
  else					\
    bcopy ((FROM), (TO), 4);	\
}

/* Convert data from virtual format for register REGNUM
   to raw format for register REGNUM.  */

#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)	\
{ \
  if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)	\
    double_to_ieee_extended (&ext_format_68881, (double *)(FROM), (TO)); \
  else					\
    bcopy ((FROM), (TO), 4);	\
}

/* Return the GDB type object for the "standard" data type
   of data in register N.  */
/* Note, for registers which contain addresses return
   pointer to void, not pointer to char, because we don't
   want to attempt to print the string after printing the address.  */
#define REGISTER_VIRTUAL_TYPE(N) \
 (((unsigned)(N) - FP0_REGNUM) < 8 ? builtin_type_double :           \
  (N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM ?         \
  lookup_pointer_type (builtin_type_void) : builtin_type_int)

#else /* no 68881.  */
/* 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 68000, all regs are 4 bytes.  */

#define REGISTER_RAW_SIZE(N) 4

/* Number of bytes of storage in the program's representation
   for register N.  On the 68000, all regs are 4 bytes.  */

#define REGISTER_VIRTUAL_SIZE(N) 4

/* 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

/* Nonzero if register N requires conversion
   from raw format to virtual format.  */

#define REGISTER_CONVERTIBLE(N) 0

/* Convert data from raw format for register REGNUM
   to virtual format for register REGNUM.  */

#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)  bcopy ((FROM), (TO), 4);

/* Convert data from virtual format for register REGNUM
   to raw format for register REGNUM.  */

#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)  bcopy ((FROM), (TO), 4);

/* Return the GDB type object for the "standard" data type
   of data in register N.  */

#define REGISTER_VIRTUAL_TYPE(N)  builtin_type_int

#endif /* No 68881.  */

/* Initializer for an array of names of registers.
   Entries beyond the first NUM_REGS are ignored.  */

#define REGISTER_NAMES  \
 {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \
  "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \
  "ps", "pc",  \
  "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \
  "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" }

/* 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 A1_REGNUM 9
#define FP_REGNUM 14		/* Contains address of executing stack frame */
#define SP_REGNUM 15		/* Contains address of top of stack */
#define PS_REGNUM 16		/* Contains processor status */
#define PC_REGNUM 17		/* Contains program counter */
#if defined (HAVE_68881)
#define FP0_REGNUM 18		/* Floating point register 0 */
#define FPC_REGNUM 26		/* 68881 control register */
#define FPS_REGNUM 27		/* 68881 status register */
#endif /* 68881.  */

/* 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) \
  { write_register (A1_REGNUM, (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.  This is assuming that floating point values are returned
   as doubles in d0/d1.  */

#if !defined (EXTRACT_RETURN_VALUE)
#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
  bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
#endif

/* Write into appropriate registers a function return value
   of type TYPE, given in virtual format.  Assumes floats are passed
   in d0/d1.  */

#if !defined (STORE_RETURN_VALUE)
#define STORE_RETURN_VALUE(TYPE,VALBUF) \
  write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
#endif

/* 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))
\f
/* 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.

   FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
   and produces the nominal address of the caller frame.

   However, if FRAME_CHAIN_VALID returns zero,
   it means the given frame is the outermost one and has no caller.
   In that case, FRAME_CHAIN_COMBINE is not used.  */

/* In the case of the 68000, the frame's nominal address
   is the address of a 4-byte word containing the calling frame's address.  */

#define FRAME_CHAIN(thisframe)  \
  (outside_startup_file ((thisframe)->pc) ? \
   read_memory_integer ((thisframe)->frame, 4) :\
   0)

#define FRAME_CHAIN_VALID(chain, thisframe) \
  (chain != 0 && outside_startup_file (FRAME_SAVED_PC (thisframe)))

#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)

/* 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) \
  (FRAMELESS) = frameless_look_for_prologue(FI)

#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))

#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(val,fi) (val = -1)
#endif

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

#define FRAME_ARGS_SKIP 8

/* 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.  */

#if !defined (FRAME_FIND_SAVED_REGS)
#if defined (HAVE_68881)
#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)		\
{ register int regnum;							\
  register int regmask;							\
  register CORE_ADDR next_addr;						\
  register CORE_ADDR pc;						\
  int nextinsn;								\
  bzero (&frame_saved_regs, sizeof frame_saved_regs);			\
  if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \
      && (frame_info)->pc <= (frame_info)->frame)				\
    { next_addr = (frame_info)->frame;					\
      pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\
  else   								\
    { pc = get_pc_function_start ((frame_info)->pc); 			\
      /* Verify we have a link a6 instruction next;			\
	 if not we lose.  If we win, find the address above the saved   \
	 regs using the amount of storage from the link instruction.  */\
      if (044016 == read_memory_integer (pc, 2))			\
	next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 4), pc+=4; \
      else if (047126 == read_memory_integer (pc, 2))			\
	next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 2), pc+=2; \
      else goto lose;							\
      /* If have an addal #-n, sp next, adjust next_addr.  */		\
      if ((0177777 & read_memory_integer (pc, 2)) == 0157774)		\
	next_addr += read_memory_integer (pc += 2, 4), pc += 4;		\
    }									\
  /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */	\
  regmask = read_memory_integer (pc + 2, 2);				\
  /* But before that can come an fmovem.  Check for it.  */		\
  nextinsn = 0xffff & read_memory_integer (pc, 2);			\
  if (0xf227 == nextinsn						\
      && (regmask & 0xff00) == 0xe000)					\
    { pc += 4; /* Regmask's low bit is for register fp7, the first pushed */ \
      for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1)		\
	if (regmask & 1)						\
          (frame_saved_regs).regs[regnum] = (next_addr -= 12);		\
      regmask = read_memory_integer (pc + 2, 2); }			\
  if (0044327 == read_memory_integer (pc, 2))				\
    { pc += 4; /* Regmask's low bit is for register 0, the first written */ \
      for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)		\
	if (regmask & 1)						\
          (frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; }	\
  else if (0044347 == read_memory_integer (pc, 2))			\
    { pc += 4; /* Regmask's low bit is for register 15, the first pushed */ \
      for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1)		\
	if (regmask & 1)						\
          (frame_saved_regs).regs[regnum] = (next_addr -= 4); }		\
  else if (0x2f00 == (0xfff0 & read_memory_integer (pc, 2)))		\
    { regnum = 0xf & read_memory_integer (pc, 2); pc += 2;		\
      (frame_saved_regs).regs[regnum] = (next_addr -= 4); }		\
  /* fmovemx to index of sp may follow.  */				\
  regmask = read_memory_integer (pc + 2, 2);				\
  nextinsn = 0xffff & read_memory_integer (pc, 2);			\
  if (0xf236 == nextinsn						\
      && (regmask & 0xff00) == 0xf000)					\
    { pc += 10; /* Regmask's low bit is for register fp0, the first written */ \
      for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1)		\
	if (regmask & 1)						\
          (frame_saved_regs).regs[regnum] = (next_addr += 12) - 12;	\
      regmask = read_memory_integer (pc + 2, 2); }			\
  /* clrw -(sp); movw ccr,-(sp) may follow.  */				\
  if (0x426742e7 == read_memory_integer (pc, 4))			\
    (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4);		\
  lose: ;								\
  (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8;		\
  (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;		\
  (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;		\
}
#else /* no 68881.  */
#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)		\
{ register int regnum;							\
  register int regmask;							\
  register CORE_ADDR next_addr;						\
  register CORE_ADDR pc;						\
  bzero (&frame_saved_regs, sizeof frame_saved_regs);			\
  if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 4 \
      && (frame_info)->pc <= (frame_info)->frame)				\
    { next_addr = (frame_info)->frame;					\
      pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4; }\
  else   								\
    { pc = get_pc_function_start ((frame_info)->pc); 			\
      /* Verify we have a link a6 instruction next;			\
	 if not we lose.  If we win, find the address above the saved   \
	 regs using the amount of storage from the link instruction.  */\
      if (044016 == read_memory_integer (pc, 2))			\
	next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 4), pc+=4; \
      else if (047126 == read_memory_integer (pc, 2))			\
	next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 2), pc+=2; \
      else goto lose;							\
      /* If have an addal #-n, sp next, adjust next_addr.  */		\
      if ((0177777 & read_memory_integer (pc, 2)) == 0157774)		\
	next_addr += read_memory_integer (pc += 2, 4), pc += 4;		\
    }									\
  /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */	\
  regmask = read_memory_integer (pc + 2, 2);				\
  if (0044327 == read_memory_integer (pc, 2))				\
    { pc += 4; /* Regmask's low bit is for register 0, the first written */ \
      for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)		\
	if (regmask & 1)						\
          (frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; }	\
  else if (0044347 == read_memory_integer (pc, 2))			\
    { pc += 4; /* Regmask's low bit is for register 15, the first pushed */ \
      for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1)		\
	if (regmask & 1)						\
          (frame_saved_regs).regs[regnum] = (next_addr -= 4); }		\
  else if (0x2f00 == 0xfff0 & read_memory_integer (pc, 2))		\
    { regnum = 0xf & read_memory_integer (pc, 2); pc += 2;		\
      (frame_saved_regs).regs[regnum] = (next_addr -= 4); }		\
  /* clrw -(sp); movw ccr,-(sp) may follow.  */				\
  if (0x426742e7 == read_memory_integer (pc, 4))			\
    (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4);		\
  lose: ;								\
  (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8;		\
  (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;		\
  (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;		\
}
#endif /* no 68881.  */
#endif /* no FIND_FRAME_SAVED_REGS.  */

/* Note that stuff for calling inferior functions is not in this file
   because the call dummy is different for different breakpoint
   instructions, which are different on different systems.  Perhaps
   they could be merged, but I haven't bothered.  */
Commit	Line	Data
dd3b648e RP	1	/* Parameters for execution on a 68000 series machine.
	2	Copyright (C) 1986, 1987, 1989, 1990 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
99a7de40	6	This program is free software; you can redistribute it and/or modify
dd3b648e	7	it under the terms of the GNU General Public License as published by
99a7de40 JG	8	the Free Software Foundation; either version 2 of the License, or
99a7de40 JG	9	(at your option) any later version.
dd3b648e	10
99a7de40	11	This program is distributed in the hope that it will be useful,
dd3b648e RP	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
99a7de40 JG	17	along with this program; if not, write to the Free Software
99a7de40 JG	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
dd3b648e RP	19
	20	/* Generic 68000 stuff, to be included by other m-*.h files.
	21	Define HAVE_68881 if that is the case. */
	22
	23	#if defined (HAVE_68881)
	24	#define IEEE_FLOAT 1
	25	#endif
	26
	27	/* Define the bit, byte, and word ordering of the machine. */
	28	#define TARGET_BYTE_ORDER BIG_ENDIAN
	29
	30	/* Offset from address of function to start of its code.
	31	Zero on most machines. */
	32
	33	#define FUNCTION_START_OFFSET 0
	34
	35	/* Advance PC across any function entry prologue instructions
	36	to reach some "real" code. */
	37
	38	#define SKIP_PROLOGUE(pc) \
	39	{ register int op = read_memory_integer (pc, 2); \
	40	if (op == 0047126) \
	41	pc += 4; /* Skip link #word */ \
	42	else if (op == 0044016) \
	43	pc += 6; /* Skip link #long */ \
	44	/* Not sure why branches are here. */ \
	45	/* From m-isi.h, m-altos.h */ \
	46	else if (op == 0060000) \
	47	pc += 4; /* Skip bra #word */ \
	48	else if (op == 00600377) \
	49	pc += 6; /* skip bra #long */ \
	50	else if ((op & 0177400) == 0060000) \
	51	pc += 2; /* skip bra #char */ \
	52	}
	53
	54	/* Immediately after a function call, return the saved pc.
	55	Can't always go through the frames for this because on some machines
	56	the new frame is not set up until the new function executes
	57	some instructions. */
	58
	59	#define SAVED_PC_AFTER_CALL(frame) \
	60	read_memory_integer (read_register (SP_REGNUM), 4)
	61
	62	/* Stack grows downward. */
	63
	64	#define INNER_THAN <
	65
	66	/* Sequence of bytes for breakpoint instruction.
	67	This is a TRAP instruction. The last 4 bits (0xf below) is the
	68	vector. Systems which don't use 0xf should define BREAKPOINT
	69	themselves before including this file. */
	70
	71	#if !defined (BREAKPOINT)
	72	#define BREAKPOINT {0x4e, 0x4f}
	73	#endif
	74
	75	/* If your kernel resets the pc after the trap happens you may need to
	76	define this in m-68k.h. */
	77
	78	#if !defined (DECR_PC_AFTER_BREAK)
	79	#define DECR_PC_AFTER_BREAK 2
	80	#endif
	81
	82	/* Nonzero if instruction at PC is a return instruction. */
83	/* Allow any of the return instructions, including a trapv and a return
84	from interupt. */
85
86	#define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 2) & ~0x3) == 0x4e74)
87
88	/* Return 1 if P points to an invalid floating point value. */
89
90	#define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
91
92	/* Say how long registers are. */
93
94	#define REGISTER_TYPE long
95
96	#if defined (HAVE_68881)
39d2bcca	97	# if defined (GDB_TARGET_IS_SUN3)
dd3b648e RP	98	/* Sun3 status includes fpflags, which shows whether the FPU has been used
	99	by the process, and whether the FPU was done with an instruction or
	100	was interrupted in the middle of a long instruction. See
	101	<machine/reg.h>. */
	102	/* a&d, pc,sr, fp, fpstat, fpflags */
	103	# define NUM_REGS 31
	104	# define REGISTER_BYTES (164 + 8 + 812 + 3*4 + 4)
	105	# else /* Not sun3. */
	106	# define NUM_REGS 29
	107	# define REGISTER_BYTES (164 + 8 + 812 + 3*4)
	108	# endif /* Not sun3. */
	109	#else /* No 68881. */
	110	# define NUM_REGS 18
	111	# define REGISTER_BYTES (16*4 + 8)
	112	#endif /* No 68881. */
	113
	114	/* Index within `registers' of the first byte of the space for
	115	register N. */
	116
	117	#if defined (HAVE_68881)
	118	#define REGISTER_BYTE(N) \
	119	((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168 \
	120	: (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72 \
	121	: (N) * 4)
	122
	123	/* Number of bytes of storage in the actual machine representation
	124	for register N. On the 68000, all regs are 4 bytes
	125	except the floating point regs which are 12 bytes. */
	126	/* Note that the unsigned cast here forces the result of the
	127	subtraction to very high positive values if N < FP0_REGNUM */
	128
	129	#define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4)
	130
	131	/* Number of bytes of storage in the program's representation
	132	for register N. On the 68000, all regs are 4 bytes
	133	except the floating point regs which are 8-byte doubles. */
	134
	135	#define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4)
	136
	137	/* Largest value REGISTER_RAW_SIZE can have. */
	138
	139	#define MAX_REGISTER_RAW_SIZE 12
	140
	141	/* Largest value REGISTER_VIRTUAL_SIZE can have. */
	142
	143	#define MAX_REGISTER_VIRTUAL_SIZE 8
	144
	145	/* Nonzero if register N requires conversion
	146	from raw format to virtual format. */
	147
	148	#define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8)
	149
de6060de JK	150	/* Put the declaration out here because if it's in the macros, PCC
de6060de JK	151	will complain. */
9fa28378	152	extern struct ext_format ext_format_68881;
de6060de	153
dd3b648e RP	154	/* Convert data from raw format for register REGNUM
	155	to virtual format for register REGNUM. */
	156
	157	#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
	158	{ \
dd3b648e	159	if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \
9fa28378	160	ieee_extended_to_double (&ext_format_68881, (FROM), (double *)(TO)); \
dd3b648e RP	161	else \
	162	bcopy ((FROM), (TO), 4); \
	163	}
	164
	165	/* Convert data from virtual format for register REGNUM
	166	to raw format for register REGNUM. */
	167
	168	#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
	169	{ \
dd3b648e	170	if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \
9fa28378	171	double_to_ieee_extended (&ext_format_68881, (double *)(FROM), (TO)); \
dd3b648e RP	172	else \
	173	bcopy ((FROM), (TO), 4); \
	174	}
	175
	176	/* Return the GDB type object for the "standard" data type
	177	of data in register N. */
	178	/* Note, for registers which contain addresses return
	179	pointer to void, not pointer to char, because we don't
	180	want to attempt to print the string after printing the address. */
	181	#define REGISTER_VIRTUAL_TYPE(N) \
	182	(((unsigned)(N) - FP0_REGNUM) < 8 ? builtin_type_double : \
	183	(N) == PC_REGNUM \|\| (N) == FP_REGNUM \|\| (N) == SP_REGNUM ? \
	184	lookup_pointer_type (builtin_type_void) : builtin_type_int)
	185
	186	#else /* no 68881. */
	187	/* Index within `registers' of the first byte of the space for
	188	register N. */
	189
	190	#define REGISTER_BYTE(N) ((N) * 4)
	191
	192	/* Number of bytes of storage in the actual machine representation
	193	for register N. On the 68000, all regs are 4 bytes. */
	194
	195	#define REGISTER_RAW_SIZE(N) 4
	196
	197	/* Number of bytes of storage in the program's representation
	198	for register N. On the 68000, all regs are 4 bytes. */
	199
	200	#define REGISTER_VIRTUAL_SIZE(N) 4
	201
	202	/* Largest value REGISTER_RAW_SIZE can have. */
	203
	204	#define MAX_REGISTER_RAW_SIZE 4
	205
	206	/* Largest value REGISTER_VIRTUAL_SIZE can have. */
	207
	208	#define MAX_REGISTER_VIRTUAL_SIZE 4
	209
	210	/* Nonzero if register N requires conversion
	211	from raw format to virtual format. */
	212
	213	#define REGISTER_CONVERTIBLE(N) 0
	214
	215	/* Convert data from raw format for register REGNUM
	216	to virtual format for register REGNUM. */
	217
	218	#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) bcopy ((FROM), (TO), 4);
	219
	220	/* Convert data from virtual format for register REGNUM
	221	to raw format for register REGNUM. */
	222
	223	#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) bcopy ((FROM), (TO), 4);
	224
	225	/* Return the GDB type object for the "standard" data type
	226	of data in register N. */
	227
	228	#define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
	229
	230	#endif /* No 68881. */
	231
	232	/* Initializer for an array of names of registers.
	233	Entries beyond the first NUM_REGS are ignored. */
	234
	235	#define REGISTER_NAMES \
236	{"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \
237	"a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \
238	"ps", "pc", \
239	"fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \
240	"fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" }
241
242	/* Register numbers of various important registers.
243	Note that some of these values are "real" register numbers,
244	and correspond to the general registers of the machine,
245	and some are "phony" register numbers which are too large
246	to be actual register numbers as far as the user is concerned
247	but do serve to get the desired values when passed to read_register. */
248
249	#define A1_REGNUM 9
250	#define FP_REGNUM 14 /* Contains address of executing stack frame */
251	#define SP_REGNUM 15 /* Contains address of top of stack */
252	#define PS_REGNUM 16 /* Contains processor status */
253	#define PC_REGNUM 17 /* Contains program counter */
254	#if defined (HAVE_68881)
255	#define FP0_REGNUM 18 /* Floating point register 0 */
256	#define FPC_REGNUM 26 /* 68881 control register */
257	#define FPS_REGNUM 27 /* 68881 status register */
258	#endif /* 68881. */
259
260	/* Store the address of the place in which to copy the structure the
261	subroutine will return. This is called from call_function. */
262
263	#define STORE_STRUCT_RETURN(ADDR, SP) \
264	{ write_register (A1_REGNUM, (ADDR)); }
265
266	/* Extract from an array REGBUF containing the (raw) register state
267	a function return value of type TYPE, and copy that, in virtual format,
268	into VALBUF. This is assuming that floating point values are returned
269	as doubles in d0/d1. */
270
271	#if !defined (EXTRACT_RETURN_VALUE)
272	#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
273	bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
274	#endif
275
276	/* Write into appropriate registers a function return value
277	of type TYPE, given in virtual format. Assumes floats are passed
278	in d0/d1. */
279
280	#if !defined (STORE_RETURN_VALUE)
281	#define STORE_RETURN_VALUE(TYPE,VALBUF) \
282	write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
283	#endif
284
285	/* Extract from an array REGBUF containing the (raw) register state
286	the address in which a function should return its structure value,
287	as a CORE_ADDR (or an expression that can be used as one). */
288
e1ce8aa5	289	#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) ((CORE_ADDR )(REGBUF))
dd3b648e RP	290	\f
	291	/* Describe the pointer in each stack frame to the previous stack frame
	292	(its caller). */
	293
	294	/* FRAME_CHAIN takes a frame's nominal address
	295	and produces the frame's chain-pointer.
	296
	297	FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
	298	and produces the nominal address of the caller frame.
	299
	300	However, if FRAME_CHAIN_VALID returns zero,
	301	it means the given frame is the outermost one and has no caller.
	302	In that case, FRAME_CHAIN_COMBINE is not used. */
	303
	304	/* In the case of the 68000, the frame's nominal address
	305	is the address of a 4-byte word containing the calling frame's address. */
	306
	307	#define FRAME_CHAIN(thisframe) \
	308	(outside_startup_file ((thisframe)->pc) ? \
	309	read_memory_integer ((thisframe)->frame, 4) :\
	310	0)
	311
	312	#define FRAME_CHAIN_VALID(chain, thisframe) \
	313	(chain != 0 && outside_startup_file (FRAME_SAVED_PC (thisframe)))
	314
	315	#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
	316
	317	/* Define other aspects of the stack frame. */
	318
	319	/* A macro that tells us whether the function invocation represented
	320	by FI does not have a frame on the stack associated with it. If it
	321	does not, FRAMELESS is set to 1, else 0. */
	322	#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
	323	(FRAMELESS) = frameless_look_for_prologue(FI)
	324
	325	#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
	326
	327	#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
	328
	329	#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
	330
	331	/* Set VAL to the number of args passed to frame described by FI.
	332	Can set VAL to -1, meaning no way to tell. */
	333
	334	/* We can't tell how many args there are
	335	now that the C compiler delays popping them. */
	336	#if !defined (FRAME_NUM_ARGS)
	337	#define FRAME_NUM_ARGS(val,fi) (val = -1)
	338	#endif
	339
	340	/* Return number of bytes at start of arglist that are not really args. */
	341
	342	#define FRAME_ARGS_SKIP 8
	343
	344	/* Put here the code to store, into a struct frame_saved_regs,
	345	the addresses of the saved registers of frame described by FRAME_INFO.
	346	This includes special registers such as pc and fp saved in special
	347	ways in the stack frame. sp is even more special:
	348	the address we return for it IS the sp for the next frame. */
	349
	350	#if !defined (FRAME_FIND_SAVED_REGS)
	351	#if defined (HAVE_68881)
	352	#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
	353	{ register int regnum; \
354	register int regmask; \
355	register CORE_ADDR next_addr; \
356	register CORE_ADDR pc; \
357	int nextinsn; \
358	bzero (&frame_saved_regs, sizeof frame_saved_regs); \
359	if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM4 - 812 - 4 \
360	&& (frame_info)->pc <= (frame_info)->frame) \
361	{ next_addr = (frame_info)->frame; \
362	pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\
363	else \
364	{ pc = get_pc_function_start ((frame_info)->pc); \
365	/* Verify we have a link a6 instruction next; \
366	if not we lose. If we win, find the address above the saved \
367	regs using the amount of storage from the link instruction. */\
368	if (044016 == read_memory_integer (pc, 2)) \
369	next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 4), pc+=4; \
370	else if (047126 == read_memory_integer (pc, 2)) \
371	next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 2), pc+=2; \
372	else goto lose; \
373	/* If have an addal #-n, sp next, adjust next_addr. */ \
374	if ((0177777 & read_memory_integer (pc, 2)) == 0157774) \
375	next_addr += read_memory_integer (pc += 2, 4), pc += 4; \
376	} \
377	/* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */ \
378	regmask = read_memory_integer (pc + 2, 2); \
379	/* But before that can come an fmovem. Check for it. */ \
380	nextinsn = 0xffff & read_memory_integer (pc, 2); \
381	if (0xf227 == nextinsn \
382	&& (regmask & 0xff00) == 0xe000) \
383	{ pc += 4; /* Regmask's low bit is for register fp7, the first pushed */ \
384	for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1) \
385	if (regmask & 1) \
386	(frame_saved_regs).regs[regnum] = (next_addr -= 12); \
387	regmask = read_memory_integer (pc + 2, 2); } \
388	if (0044327 == read_memory_integer (pc, 2)) \
389	{ pc += 4; /* Regmask's low bit is for register 0, the first written */ \
390	for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \
391	if (regmask & 1) \
392	(frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; } \
393	else if (0044347 == read_memory_integer (pc, 2)) \
394	{ pc += 4; /* Regmask's low bit is for register 15, the first pushed */ \
395	for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \
396	if (regmask & 1) \
397	(frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
398	else if (0x2f00 == (0xfff0 & read_memory_integer (pc, 2))) \
399	{ regnum = 0xf & read_memory_integer (pc, 2); pc += 2; \
400	(frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
401	/* fmovemx to index of sp may follow. */ \
402	regmask = read_memory_integer (pc + 2, 2); \
403	nextinsn = 0xffff & read_memory_integer (pc, 2); \
404	if (0xf236 == nextinsn \
405	&& (regmask & 0xff00) == 0xf000) \
406	{ pc += 10; /* Regmask's low bit is for register fp0, the first written */ \
407	for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1) \
408	if (regmask & 1) \
409	(frame_saved_regs).regs[regnum] = (next_addr += 12) - 12; \
410	regmask = read_memory_integer (pc + 2, 2); } \
411	/* clrw -(sp); movw ccr,-(sp) may follow. */ \
412	if (0x426742e7 == read_memory_integer (pc, 4)) \
413	(frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4); \
414	lose: ; \
415	(frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8; \
416	(frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \
417	(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \
418	}
419	#else /* no 68881. */
420	#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
421	{ register int regnum; \
422	register int regmask; \
423	register CORE_ADDR next_addr; \
424	register CORE_ADDR pc; \
425	bzero (&frame_saved_regs, sizeof frame_saved_regs); \
426	if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 4 \
427	&& (frame_info)->pc <= (frame_info)->frame) \
428	{ next_addr = (frame_info)->frame; \
429	pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4; }\
430	else \
431	{ pc = get_pc_function_start ((frame_info)->pc); \
432	/* Verify we have a link a6 instruction next; \
433	if not we lose. If we win, find the address above the saved \
434	regs using the amount of storage from the link instruction. */\
435	if (044016 == read_memory_integer (pc, 2)) \
436	next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 4), pc+=4; \
437	else if (047126 == read_memory_integer (pc, 2)) \
438	next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 2), pc+=2; \
439	else goto lose; \
440	/* If have an addal #-n, sp next, adjust next_addr. */ \
441	if ((0177777 & read_memory_integer (pc, 2)) == 0157774) \
442	next_addr += read_memory_integer (pc += 2, 4), pc += 4; \
443	} \
444	/* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */ \
445	regmask = read_memory_integer (pc + 2, 2); \
446	if (0044327 == read_memory_integer (pc, 2)) \
447	{ pc += 4; /* Regmask's low bit is for register 0, the first written */ \
448	for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \
449	if (regmask & 1) \
450	(frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; } \
451	else if (0044347 == read_memory_integer (pc, 2)) \
452	{ pc += 4; /* Regmask's low bit is for register 15, the first pushed */ \
453	for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \
454	if (regmask & 1) \
455	(frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
456	else if (0x2f00 == 0xfff0 & read_memory_integer (pc, 2)) \
457	{ regnum = 0xf & read_memory_integer (pc, 2); pc += 2; \
458	(frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
459	/* clrw -(sp); movw ccr,-(sp) may follow. */ \
460	if (0x426742e7 == read_memory_integer (pc, 4)) \
461	(frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4); \
462	lose: ; \
463	(frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8; \
464	(frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \
465	(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \
466	}
467	#endif /* no 68881. */
468	#endif /* no FIND_FRAME_SAVED_REGS. */
469
470	/* Note that stuff for calling inferior functions is not in this file
471	because the call dummy is different for different breakpoint
472	instructions, which are different on different systems. Perhaps
473	they could be merged, but I haven't bothered. */