[deliverable/binutils-gdb.git] / gdb / tm-np1.h

/* Parameters for targeting on a Gould NP1, for GDB, the GNU debugger.
   Copyright (C) 1986, 1987, 1989, 1991 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.  */

#define GOULD_NPL

#define TARGET_BYTE_ORDER BIG_ENDIAN

/* N_ENTRY appears in libraries on Gould machines.
   Don't know what 0xa4 is; it's mentioned in stab.h
   but only in the sdb symbol list.  */
#define IGNORE_SYMBOL(type) (type == N_ENTRY || type == 0xa4)

/* We don't want the extra gnu symbols on the machine;
   they will interfere with the shared segment symbols.  */
#define NO_GNU_STABS

/* Macro for text-offset and data info (in NPL a.out format).  */
#define	TEXTINFO						\
        text_offset = N_TXTOFF (exec_coffhdr, exec_aouthdr);	\
        exec_data_offset = N_TXTOFF (exec_coffhdr, exec_aouthdr)\
                + exec_aouthdr.a_text

/* Macro for number of symbol table entries */
#define NUMBER_OF_SYMBOLS					\
	(coffhdr.f_nsyms)

/* Macro for file-offset of symbol table (in NPL a.out format).  */
#define SYMBOL_TABLE_OFFSET					\
	N_SYMOFF (coffhdr)

/* Macro for file-offset of string table (in NPL a.out format).  */
#define STRING_TABLE_OFFSET					\
	(N_STROFF (coffhdr))

/* Macro to store the length of the string table data in INTO.  */
#define READ_STRING_TABLE_SIZE(INTO)				\
	{ INTO = hdr.a_stsize; }

/* Macro to declare variables to hold the file's header data.  */
#define DECLARE_FILE_HEADERS  struct exec hdr;			\
			      FILHDR coffhdr

/* Macro to read the header data from descriptor DESC and validate it.
   NAME is the file name, for error messages.  */
#define READ_FILE_HEADERS(DESC, NAME)				\
{ val = myread (DESC, &coffhdr, sizeof coffhdr);		\
  if (val < 0)							\
    perror_with_name (NAME);					\
  val = myread (DESC, &hdr, sizeof hdr);			\
  if (val < 0)							\
    perror_with_name (NAME);					\
  if (coffhdr.f_magic != GNP1MAGIC)				\
    error ("File \"%s\" not in coff executable format.", NAME);	\
  if (N_BADMAG (hdr))						\
    error ("File \"%s\" not in executable format.", NAME); }

/* Define COFF and other symbolic names needed on NP1 */
#define	NS32GMAGIC	GNP1MAGIC
#define	NS32SMAGIC	GPNMAGIC

/* Define this if the C compiler puts an underscore at the front
   of external names before giving them to the linker.  */
#define NAMES_HAVE_UNDERSCORE

/* Address of blocks in N_LBRAC and N_RBRAC symbols are absolute addresses,
   not relative to start of source address.  */
#define BLOCK_ADDRESS_ABSOLUTE

/* Offset from address of function to start of its code.
   Zero on most machines.  */
#define FUNCTION_START_OFFSET	8

/* Advance PC across any function entry prologue instructions
   to reach some "real" code.  One NPL we can have one two startup
   sequences depending on the size of the local stack:

   Either:
      "suabr b2, #"
   of
      "lil r4, #", "suabr b2, #(r4)"

   "lwbr b6, #", "stw r1, 8(b2)"
   Optional "stwbr b3, c(b2)"
   Optional "trr r2,r7"      (Gould first argument register passing)
     or
   Optional "stw r2,8(b3)"   (Gould first argument register passing)
 */
#define SKIP_PROLOGUE(pc) { 						\
	register int op = read_memory_integer ((pc), 4);		\
	if ((op & 0xffff0000) == 0xFA0B0000) { 				\
	    pc += 4;							\
	    op = read_memory_integer ((pc), 4);				\
	    if ((op & 0xffff0000) == 0x59400000) {			\
		pc += 4;						\
	        op = read_memory_integer ((pc), 4);			\
		if ((op & 0xffff0000) == 0x5F000000) {			\
		    pc += 4;						\
	            op = read_memory_integer ((pc), 4);			\
		    if (op == 0xD4820008) {				\
		    	pc += 4;					\
	            	op = read_memory_integer ((pc), 4);		\
		    	if (op == 0x5582000C) {				\
		    	    pc += 4;					\
	                    op = read_memory_integer ((pc), 2);		\
		            if (op == 0x2fa0) {				\
		    	        pc += 2;				\
		            } else {					\
	                        op = read_memory_integer ((pc), 4);	\
		                if (op == 0xd5030008) {			\
		    	            pc += 4;				\
		                }					\
		            }						\
		        } else {					\
	                    op = read_memory_integer ((pc), 2);		\
		            if (op == 0x2fa0) {				\
		    	        pc += 2;				\
		            }						\
		        }						\
		    }							\
		}							\
	    }								\
	} 								\
	if ((op & 0xffff0000) == 0x59000000) { 				\
	    pc += 4;							\
	    op = read_memory_integer ((pc), 4);				\
	    if ((op & 0xffff0000) == 0x5F000000) {			\
		pc += 4;						\
	        op = read_memory_integer ((pc), 4);			\
		if (op == 0xD4820008) {					\
		    pc += 4;						\
	            op = read_memory_integer ((pc), 4);			\
		    if (op == 0x5582000C) {				\
		    	pc += 4;					\
	                op = read_memory_integer ((pc), 2);		\
		        if (op == 0x2fa0) {				\
		    	    pc += 2;					\
		        } else {					\
	                    op = read_memory_integer ((pc), 4);		\
		            if (op == 0xd5030008) {			\
		    	        pc += 4;				\
		            }						\
		        }						\
		    } else {						\
	                op = read_memory_integer ((pc), 2);		\
		        if (op == 0x2fa0) {				\
		    	    pc += 2;					\
		        }						\
		    }							\
		}							\
	    }								\
	} 								\
}

/* Immediately after a function call, return the saved pc.
   Can't go through the frames for this because on some machines
   the new frame is not set up until the new function executes
   some instructions.  True on NPL! Return address is in R1.
   The true return address is REALLY 4 past that location! */
#define SAVED_PC_AFTER_CALL(frame) \
	(read_register(R1_REGNUM) + 4)

/* Address of end of stack space.  */
#define STACK_END_ADDR 		0x7fffc000

/* Stack grows downward.  */
#define INNER_THAN 		<

/* Sequence of bytes for breakpoint instruction.
   This is padded out to the size of a machine word.  When it was just
   {0x28, 0x09} it gave problems if hit breakpoint on returning from a
   function call.  */
#define BREAKPOINT 		{0x28, 0x09, 0x0, 0x0}

/* Amount PC must be decremented by after a breakpoint.
   This is often the number of bytes in BREAKPOINT
   but not always.  */
#define DECR_PC_AFTER_BREAK	2

/* Nonzero if instruction at PC is a return instruction. "bu 4(r1)" */
#define ABOUT_TO_RETURN(pc)	(read_memory_integer (pc, 4) == 0x40100004)

/* Return 1 if P points to an invalid floating point value.  */
#define INVALID_FLOAT(p, len) 	((*(short *)p & 0xff80) == 0x8000)

/* Say how long (ordinary) registers are.  */
#define REGISTER_TYPE 		long

/* Size of bytes of vector register (NP1 only), 32 elements * sizeof(int) */
#define VR_SIZE			128

/* Number of machine registers */
#define NUM_REGS 		27
#define NUM_GEN_REGS		16
#define NUM_CPU_REGS		4
#define NUM_VECTOR_REGS		7

/* Initializer for an array of names of registers.
   There should be NUM_REGS strings in this initializer.  */
#define REGISTER_NAMES { \
  "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
  "b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", \
  "sp", "ps", "pc", "ve", \
  "v1", "v2", "v3", "v4", "v5", "v6", "v7", \
}

/* 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 R1_REGNUM	1	/* Gr1 => return address of caller */
#define R2_REGNUM	2	/* Gr2 => return value from function */
#define R4_REGNUM	4	/* Gr4 => register save area */
#define R5_REGNUM	5	/* Gr5 => register save area */
#define R6_REGNUM	6	/* Gr6 => register save area */
#define R7_REGNUM	7	/* Gr7 => register save area */
#define B1_REGNUM	9	/* Br1 => start of this code routine */
#define SP_REGNUM	10	/* Br2 == (sp) */
#define AP_REGNUM	11	/* Br3 == (ap) */
#define FP_REGNUM 	16	/* A copy of Br2 saved in trap */
#define PS_REGNUM 	17	/* Contains processor status */
#define PC_REGNUM 	18	/* Contains program counter */
#define VE_REGNUM 	19	/* Vector end (user setup) register */
#define V1_REGNUM 	20	/* First vector register */
#define V7_REGNUM 	26	/* First vector register */

/* Total amount of space needed to store our copies of the machine's
   register state, the array `registers'.  */
#define REGISTER_BYTES \
	(NUM_GEN_REGS*4 + NUM_VECTOR_REGS*VR_SIZE + NUM_CPU_REGS*4)

/* Index within `registers' of the first byte of the space for
   register N.  */
#define REGISTER_BYTE(N)  \
	(((N) < V1_REGNUM) ? ((N) * 4) : (((N) - V1_REGNUM) * VR_SIZE) + 80)

/* Number of bytes of storage in the actual machine representation
   for register N.  On the NP1, all normal regs are 4 bytes, but
   the vector registers are VR_SIZE*4 bytes long. */
#define REGISTER_RAW_SIZE(N) \
	(((N) < V1_REGNUM) ? 4 : VR_SIZE)

/* Number of bytes of storage in the program's representation
   for register N.  On the NP1, all regs are 4 bytes. */
#define REGISTER_VIRTUAL_SIZE(N) \
	(((N) < V1_REGNUM) ? 4 : VR_SIZE)

/* Largest value REGISTER_RAW_SIZE can have.  */
#define MAX_REGISTER_RAW_SIZE		VR_SIZE

/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
#define MAX_REGISTER_VIRTUAL_SIZE	VR_SIZE

/* 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), REGISTER_RAW_SIZE(REGNUM));

/* 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), REGISTER_VIRTUAL_SIZE(REGNUM));

/* Return the GDB type object for the "standard" data type
   of data in register N.  */
#define REGISTER_VIRTUAL_TYPE(N)	\
  ((N) > VE_REGNUM ? builtin_type_np1_vector : builtin_type_int)
extern struct type *builtin_type_np1_vector;

/* Store the address of the place in which to copy the structure the
   subroutine will return.  This is called from call_function.

   On this machine this is a no-op, because gcc isn't used on it
   yet.  So this calling convention is not used. */

#define STORE_STRUCT_RETURN(ADDR, SP) push_word(SP + 8, ADDR)

/* Extract from an arrary 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) \
	bcopy (((int *)(REGBUF)) + 2, VALBUF, TYPE_LENGTH (TYPE))

/* Write into appropriate registers a function return value
   of type TYPE, given in virtual format.  */

#define STORE_RETURN_VALUE(TYPE,VALBUF) \
	write_register_bytes (REGISTER_BYTE (R2_REGNUM), 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) (*((int *)(REGBUF) + 2))

/* Both gcc and cc return small structs in registers (i.e. in GDB
   terminology, small structs don't use the struct return convention).  */
#define USE_STRUCT_CONVENTION(gcc_p, type) (TYPE_LENGTH(type) > 8)
\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.

   However, if FRAME_CHAIN_VALID returns zero,
   it means the given frame is the outermost one and has no caller.  */

/* In the case of the NPL, the frame's norminal address is Br2 and the 
   previous routines frame is up the stack X bytes, where X is the
   value stored in the code function header xA(Br1). */
#define FRAME_CHAIN(thisframe)		(findframe(thisframe))

#define FRAME_CHAIN_VALID(chain, thisframe) \
        (chain != 0 && chain != (thisframe)->frame)

/* Define other aspects of the stack frame on NPL.  */
#define FRAME_SAVED_PC(FRAME) \
	(read_memory_integer ((FRAME)->frame + 8, 4))

#define FRAME_ARGS_ADDRESS(fi) \
	((fi)->next_frame ? \
	 read_memory_integer ((fi)->frame + 12, 4) : \
	 read_register (AP_REGNUM))

#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 check the stab info to see how
   many arg we have.  No info in stack will tell us */
#define FRAME_NUM_ARGS(val,fi)		(val = findarg(fi))

/* 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.  */

#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)		\
{                                                                       \
  bzero (&frame_saved_regs, sizeof frame_saved_regs);			\
  (frame_saved_regs).regs[SP_REGNUM] = framechain (frame_info);         \
  (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 8;		\
  (frame_saved_regs).regs[R4_REGNUM] = (frame_info)->frame + 0x30;	\
  (frame_saved_regs).regs[R5_REGNUM] = (frame_info)->frame + 0x34;	\
  (frame_saved_regs).regs[R6_REGNUM] = (frame_info)->frame + 0x38;	\
  (frame_saved_regs).regs[R7_REGNUM] = (frame_info)->frame + 0x3C;	\
}
\f
/* Things needed for making the inferior call functions.  */

#define CALL_DUMMY_LOCATION	BEFORE_TEXT_END
#define	NEED_TEXT_START_END

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

#define PUSH_DUMMY_FRAME \
{ register CORE_ADDR sp = read_register (SP_REGNUM); \
  register int regnum;                               \
  for (regnum = 0; regnum < FP_REGNUM; regnum++)     \
    sp = push_word (sp, read_register (regnum));     \
  sp = push_word (sp, read_register (PS_REGNUM));    \
  sp = push_word (sp, read_register (PC_REGNUM));    \
  write_register (SP_REGNUM, sp);}

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

#define POP_FRAME  \
{ CORE_ADDR sp = read_register(SP_REGNUM);             \
  REGISTER_TYPE reg;                                   \
  int regnum;                                          \
  for(regnum = 0;regnum < FP_REGNUM;regnum++){         \
    sp-=sizeof(REGISTER_TYPE);                         \
    read_memory(sp,&reg,sizeof(REGISTER_TYPE));        \
    write_register(regnum,reg);}                       \
  sp-=sizeof(REGISTER_TYPE);                           \
  read_memory(sp,&reg,sizeof(REGISTER_TYPE));          \
  write_register(PS_REGNUM,reg);                       \
  sp-=sizeof(REGISTER_TYPE);                           \
  read_memory(sp,&reg,sizeof(REGISTER_TYPE));          \
  write_register(PC_REGNUM,reg);}

/* MJD - Size of dummy frame pushed onto stack by PUSH_DUMMY_FRAME */

#define DUMMY_FRAME_SIZE (0x48)

/* MJD - The sequence of words in the instructions is
   halt
   halt
   halt
   halt
   subr    b2,stack size,0             grab stack space for dummy call
   labr    b3,x0(b2),0                 set AP_REGNUM to point at arguments
   lw      r2,x8(b3),0                 load r2 with first argument    
   lwbr    b1,arguments size(b2),0     load address of function to be called
   brlnk   r1,x8(b1),0                 call function
   halt
   halt
   labr    b2,stack size(b2),0         give back stack
   break                               break
   */

#define CALL_DUMMY {0x00000000,  \
		    0x00000000,  \
		    0x59000000,  \
		    0x598a0000,  \
		    0xb5030008,  \
		    0x5c820000,  \
		    0x44810008,  \
		    0x00000000,  \
		    0x590a0000,  \
		    0x28090000 }

#define CALL_DUMMY_LENGTH 40

#define CALL_DUMMY_START_OFFSET 8

#define CALL_DUMMY_STACK_ADJUST 8

/* MJD - Fixup CALL_DUMMY for the specific function call.
   OK heres the problems
   1) On a trap there are two copies of the stack pointer, one in SP_REGNUM
      which is read/write and one in FP_REGNUM which is only read. It seems
      that when restarting the GOULD NP1 uses FP_REGNUM's value.
   2) Loading function address into b1 looks a bit difficult if bigger than
      0x0000fffc, infact from what I can tell the compiler sets up table of
      function address in base3 through which function calls are referenced.

   OK my solutions
     Calculate the size of the dummy stack frame and do adjustments of
     SP_REGNUM in the dummy call.
     Push function address onto the stack and load it in the dummy call
 */

#define FIX_CALL_DUMMY(dummyname, sp, fun, nargs, args, type, gcc_p) \
  {   int i;\
      int arg_len = 0, total_len;\
      old_sp = push_word(old_sp,fun);\
      for(i = nargs - 1;i >= 0;i--)\
	arg_len += TYPE_LENGTH (VALUE_TYPE (value_arg_coerce (args[i])));\
      if(struct_return)\
	arg_len += TYPE_LENGTH(value_type);\
      total_len = DUMMY_FRAME_SIZE+CALL_DUMMY_STACK_ADJUST+4+arg_len;\
      dummyname[0] += total_len;\
      dummyname[2] += total_len;\
      dummyname[5] += arg_len+CALL_DUMMY_STACK_ADJUST;\
      dummyname[8] += total_len;}

/* MJD - So the stack should end up looking like this

                   | Normal stack frame  |
                   | from normal program |
                   | flow                |
                   +---------------------+ <- Final sp - 0x08 - argument size
                   |                     |    - 0x4 - dummy_frame_size
                   | Pushed dummy frame  |
                   |  b0-b7, r0-r7       |
                   |  pc and ps          |
                   |                     |
                   +---------------------+
                   | Function address    |
                   +---------------------+ <- Final sp - 0x8 - arguments size
                   |                     |
                   |                     |
                   |                     |
                   |  Arguments to       |
                   |       Function      |
                   |                     |
                   |                     |
                   |                     |
                   +---------------------+ <- Final sp - 0x8
                   | Dummy_stack_adjust  |
                   +---------------------+ <- Final sp
                   |                     |
                   | where call will     |
                   |   build frame       |
*/
Commit	Line	Data
dd3b648e	1	/* Parameters for targeting on a Gould NP1, for GDB, the GNU debugger.
fbcb5095	2	Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
dd3b648e RP	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	#define GOULD_NPL
	21
	22	#define TARGET_BYTE_ORDER BIG_ENDIAN
	23
	24	/* N_ENTRY appears in libraries on Gould machines.
	25	Don't know what 0xa4 is; it's mentioned in stab.h
	26	but only in the sdb symbol list. */
	27	#define IGNORE_SYMBOL(type) (type == N_ENTRY \|\| type == 0xa4)
	28
	29	/* We don't want the extra gnu symbols on the machine;
	30	they will interfere with the shared segment symbols. */
	31	#define NO_GNU_STABS
	32
	33	/* Macro for text-offset and data info (in NPL a.out format). */
	34	#define TEXTINFO \
	35	text_offset = N_TXTOFF (exec_coffhdr, exec_aouthdr); \
	36	exec_data_offset = N_TXTOFF (exec_coffhdr, exec_aouthdr)\
	37	+ exec_aouthdr.a_text
	38
	39	/* Macro for number of symbol table entries */
	40	#define NUMBER_OF_SYMBOLS \
	41	(coffhdr.f_nsyms)
	42
	43	/* Macro for file-offset of symbol table (in NPL a.out format). */
	44	#define SYMBOL_TABLE_OFFSET \
	45	N_SYMOFF (coffhdr)
	46
	47	/* Macro for file-offset of string table (in NPL a.out format). */
	48	#define STRING_TABLE_OFFSET \
	49	(N_STROFF (coffhdr))
	50
	51	/* Macro to store the length of the string table data in INTO. */
	52	#define READ_STRING_TABLE_SIZE(INTO) \
	53	{ INTO = hdr.a_stsize; }
	54
	55	/* Macro to declare variables to hold the file's header data. */
	56	#define DECLARE_FILE_HEADERS struct exec hdr; \
	57	FILHDR coffhdr
	58
	59	/* Macro to read the header data from descriptor DESC and validate it.
	60	NAME is the file name, for error messages. */
	61	#define READ_FILE_HEADERS(DESC, NAME) \
	62	{ val = myread (DESC, &coffhdr, sizeof coffhdr); \
	63	if (val < 0) \
	64	perror_with_name (NAME); \
	65	val = myread (DESC, &hdr, sizeof hdr); \
	66	if (val < 0) \
	67	perror_with_name (NAME); \
	68	if (coffhdr.f_magic != GNP1MAGIC) \
	69	error ("File \"%s\" not in coff executable format.", NAME); \
	70	if (N_BADMAG (hdr)) \
	71	error ("File \"%s\" not in executable format.", NAME); }
	72
	73	/* Define COFF and other symbolic names needed on NP1 */
	74	#define NS32GMAGIC GNP1MAGIC
	75	#define NS32SMAGIC GPNMAGIC
	76
	77	/* Define this if the C compiler puts an underscore at the front
	78	of external names before giving them to the linker. */
	79	#define NAMES_HAVE_UNDERSCORE
	80
dd3b648e RP	81	/* Address of blocks in N_LBRAC and N_RBRAC symbols are absolute addresses,
	82	not relative to start of source address. */
	83	#define BLOCK_ADDRESS_ABSOLUTE
	84
	85	/* Offset from address of function to start of its code.
	86	Zero on most machines. */
	87	#define FUNCTION_START_OFFSET 8
	88
	89	/* Advance PC across any function entry prologue instructions
	90	to reach some "real" code. One NPL we can have one two startup
	91	sequences depending on the size of the local stack:
	92
	93	Either:
	94	"suabr b2, #"
	95	of
	96	"lil r4, #", "suabr b2, #(r4)"
	97
	98	"lwbr b6, #", "stw r1, 8(b2)"
	99	Optional "stwbr b3, c(b2)"
	100	Optional "trr r2,r7" (Gould first argument register passing)
	101	or
	102	Optional "stw r2,8(b3)" (Gould first argument register passing)
	103	*/
	104	#define SKIP_PROLOGUE(pc) { \
	105	register int op = read_memory_integer ((pc), 4); \
	106	if ((op & 0xffff0000) == 0xFA0B0000) { \
	107	pc += 4; \
	108	op = read_memory_integer ((pc), 4); \
	109	if ((op & 0xffff0000) == 0x59400000) { \
	110	pc += 4; \
	111	op = read_memory_integer ((pc), 4); \
	112	if ((op & 0xffff0000) == 0x5F000000) { \
	113	pc += 4; \
	114	op = read_memory_integer ((pc), 4); \
	115	if (op == 0xD4820008) { \
	116	pc += 4; \
	117	op = read_memory_integer ((pc), 4); \
	118	if (op == 0x5582000C) { \
	119	pc += 4; \
	120	op = read_memory_integer ((pc), 2); \
	121	if (op == 0x2fa0) { \
	122	pc += 2; \
	123	} else { \
	124	op = read_memory_integer ((pc), 4); \
	125	if (op == 0xd5030008) { \
	126	pc += 4; \
	127	} \
	128	} \
	129	} else { \
	130	op = read_memory_integer ((pc), 2); \
	131	if (op == 0x2fa0) { \
	132	pc += 2; \
	133	} \
	134	} \
	135	} \
	136	} \
	137	} \
	138	} \
	139	if ((op & 0xffff0000) == 0x59000000) { \
	140	pc += 4; \
	141	op = read_memory_integer ((pc), 4); \
	142	if ((op & 0xffff0000) == 0x5F000000) { \
	143	pc += 4; \
	144	op = read_memory_integer ((pc), 4); \
145	if (op == 0xD4820008) { \
146	pc += 4; \
147	op = read_memory_integer ((pc), 4); \
148	if (op == 0x5582000C) { \
149	pc += 4; \
150	op = read_memory_integer ((pc), 2); \
151	if (op == 0x2fa0) { \
152	pc += 2; \
153	} else { \
154	op = read_memory_integer ((pc), 4); \
155	if (op == 0xd5030008) { \
156	pc += 4; \
157	} \
158	} \
159	} else { \
160	op = read_memory_integer ((pc), 2); \
161	if (op == 0x2fa0) { \
162	pc += 2; \
163	} \
164	} \
165	} \
166	} \
167	} \
168	}
169
170	/* Immediately after a function call, return the saved pc.
171	Can't go through the frames for this because on some machines
172	the new frame is not set up until the new function executes
173	some instructions. True on NPL! Return address is in R1.
174	The true return address is REALLY 4 past that location! */
175	#define SAVED_PC_AFTER_CALL(frame) \
176	(read_register(R1_REGNUM) + 4)
177
178	/* Address of end of stack space. */
179	#define STACK_END_ADDR 0x7fffc000
180
181	/* Stack grows downward. */
182	#define INNER_THAN <
183
184	/* Sequence of bytes for breakpoint instruction.
185	This is padded out to the size of a machine word. When it was just
186	{0x28, 0x09} it gave problems if hit breakpoint on returning from a
187	function call. */
188	#define BREAKPOINT {0x28, 0x09, 0x0, 0x0}
189
190	/* Amount PC must be decremented by after a breakpoint.
191	This is often the number of bytes in BREAKPOINT
192	but not always. */
193	#define DECR_PC_AFTER_BREAK 2
194
195	/* Nonzero if instruction at PC is a return instruction. "bu 4(r1)" */
196	#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x40100004)
197
198	/* Return 1 if P points to an invalid floating point value. */
199	#define INVALID_FLOAT(p, len) (((short )p & 0xff80) == 0x8000)
200
201	/* Say how long (ordinary) registers are. */
202	#define REGISTER_TYPE long
203
204	/* Size of bytes of vector register (NP1 only), 32 elements * sizeof(int) */
205	#define VR_SIZE 128
206
207	/* Number of machine registers */
208	#define NUM_REGS 27
209	#define NUM_GEN_REGS 16
210	#define NUM_CPU_REGS 4
211	#define NUM_VECTOR_REGS 7
212
213	/* Initializer for an array of names of registers.
214	There should be NUM_REGS strings in this initializer. */
215	#define REGISTER_NAMES { \
216	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
217	"b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", \
218	"sp", "ps", "pc", "ve", \
219	"v1", "v2", "v3", "v4", "v5", "v6", "v7", \
220	}
221
222	/* Register numbers of various important registers.
223	Note that some of these values are "real" register numbers,
224	and correspond to the general registers of the machine,
225	and some are "phony" register numbers which are too large
226	to be actual register numbers as far as the user is concerned
227	but do serve to get the desired values when passed to read_register. */
228	#define R1_REGNUM 1 /* Gr1 => return address of caller */
229	#define R2_REGNUM 2 /* Gr2 => return value from function */
230	#define R4_REGNUM 4 /* Gr4 => register save area */
231	#define R5_REGNUM 5 /* Gr5 => register save area */
232	#define R6_REGNUM 6 /* Gr6 => register save area */
233	#define R7_REGNUM 7 /* Gr7 => register save area */
234	#define B1_REGNUM 9 /* Br1 => start of this code routine */
235	#define SP_REGNUM 10 /* Br2 == (sp) */
236	#define AP_REGNUM 11 /* Br3 == (ap) */
237	#define FP_REGNUM 16 /* A copy of Br2 saved in trap */
238	#define PS_REGNUM 17 /* Contains processor status */
239	#define PC_REGNUM 18 /* Contains program counter */
240	#define VE_REGNUM 19 /* Vector end (user setup) register */
241	#define V1_REGNUM 20 /* First vector register */
242	#define V7_REGNUM 26 /* First vector register */
243
244	/* Total amount of space needed to store our copies of the machine's
245	register state, the array `registers'. */
246	#define REGISTER_BYTES \
247	(NUM_GEN_REGS4 + NUM_VECTOR_REGSVR_SIZE + NUM_CPU_REGS*4)
248
249	/* Index within `registers' of the first byte of the space for
250	register N. */
251	#define REGISTER_BYTE(N) \
252	(((N) < V1_REGNUM) ? ((N) * 4) : (((N) - V1_REGNUM) * VR_SIZE) + 80)
253
254	/* Number of bytes of storage in the actual machine representation
255	for register N. On the NP1, all normal regs are 4 bytes, but
256	the vector registers are VR_SIZE4 bytes long. /
257	#define REGISTER_RAW_SIZE(N) \
258	(((N) < V1_REGNUM) ? 4 : VR_SIZE)
259
260	/* Number of bytes of storage in the program's representation
261	for register N. On the NP1, all regs are 4 bytes. */
262	#define REGISTER_VIRTUAL_SIZE(N) \
263	(((N) < V1_REGNUM) ? 4 : VR_SIZE)
264
265	/* Largest value REGISTER_RAW_SIZE can have. */
266	#define MAX_REGISTER_RAW_SIZE VR_SIZE
267
268	/* Largest value REGISTER_VIRTUAL_SIZE can have. */
269	#define MAX_REGISTER_VIRTUAL_SIZE VR_SIZE
270
271	/* Nonzero if register N requires conversion
272	from raw format to virtual format. */
273	#define REGISTER_CONVERTIBLE(N) (0)
274
275	/* Convert data from raw format for register REGNUM
276	to virtual format for register REGNUM. */
277	#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
278	bcopy ((FROM), (TO), REGISTER_RAW_SIZE(REGNUM));
279
280	/* Convert data from virtual format for register REGNUM
281	to raw format for register REGNUM. */
282	#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
283	bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
284
285	/* Return the GDB type object for the "standard" data type
286	of data in register N. */
287	#define REGISTER_VIRTUAL_TYPE(N) \
288	((N) > VE_REGNUM ? builtin_type_np1_vector : builtin_type_int)
289	extern struct type *builtin_type_np1_vector;
290
291	/* Store the address of the place in which to copy the structure the
292	subroutine will return. This is called from call_function.
293
294	On this machine this is a no-op, because gcc isn't used on it
295	yet. So this calling convention is not used. */
296
297	#define STORE_STRUCT_RETURN(ADDR, SP) push_word(SP + 8, ADDR)
298
299	/* Extract from an arrary REGBUF containing the (raw) register state
300	a function return value of type TYPE, and copy that, in virtual format,
301	into VALBUF. */
302
303	#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
304	bcopy (((int *)(REGBUF)) + 2, VALBUF, TYPE_LENGTH (TYPE))
305
306	/* Write into appropriate registers a function return value
307	of type TYPE, given in virtual format. */
308
309	#define STORE_RETURN_VALUE(TYPE,VALBUF) \
310	write_register_bytes (REGISTER_BYTE (R2_REGNUM), VALBUF, \
311	TYPE_LENGTH (TYPE))
312
313	/* Extract from an array REGBUF containing the (raw) register state
314	the address in which a function should return its structure value,
315	as a CORE_ADDR (or an expression that can be used as one). */
316
317	#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (((int )(REGBUF) + 2))
318
319	/* Both gcc and cc return small structs in registers (i.e. in GDB
320	terminology, small structs don't use the struct return convention). */
321	#define USE_STRUCT_CONVENTION(gcc_p, type) (TYPE_LENGTH(type) > 8)
322	\f
323	/* Describe the pointer in each stack frame to the previous stack frame
324	(its caller). */
325
326	/* FRAME_CHAIN takes a frame's nominal address
327	and produces the frame's chain-pointer.
328
dd3b648e	329	However, if FRAME_CHAIN_VALID returns zero,
e140f1da	330	it means the given frame is the outermost one and has no caller. */
dd3b648e RP	331
	332	/* In the case of the NPL, the frame's norminal address is Br2 and the
	333	previous routines frame is up the stack X bytes, where X is the
	334	value stored in the code function header xA(Br1). */
	335	#define FRAME_CHAIN(thisframe) (findframe(thisframe))
	336
	337	#define FRAME_CHAIN_VALID(chain, thisframe) \
	338	(chain != 0 && chain != (thisframe)->frame)
	339
dd3b648e RP	340	/* Define other aspects of the stack frame on NPL. */
	341	#define FRAME_SAVED_PC(FRAME) \
	342	(read_memory_integer ((FRAME)->frame + 8, 4))
	343
	344	#define FRAME_ARGS_ADDRESS(fi) \
	345	((fi)->next_frame ? \
	346	read_memory_integer ((fi)->frame + 12, 4) : \
	347	read_register (AP_REGNUM))
	348
	349	#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
	350
	351	/* Set VAL to the number of args passed to frame described by FI.
	352	Can set VAL to -1, meaning no way to tell. */
	353
	354	/* We can check the stab info to see how
	355	many arg we have. No info in stack will tell us */
	356	#define FRAME_NUM_ARGS(val,fi) (val = findarg(fi))
	357
	358	/* Return number of bytes at start of arglist that are not really args. */
	359	#define FRAME_ARGS_SKIP 8
	360
	361	/* Put here the code to store, into a struct frame_saved_regs,
	362	the addresses of the saved registers of frame described by FRAME_INFO.
	363	This includes special registers such as pc and fp saved in special
	364	ways in the stack frame. sp is even more special:
	365	the address we return for it IS the sp for the next frame. */
	366
	367	#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
	368	{ \
	369	bzero (&frame_saved_regs, sizeof frame_saved_regs); \
	370	(frame_saved_regs).regs[SP_REGNUM] = framechain (frame_info); \
	371	(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 8; \
	372	(frame_saved_regs).regs[R4_REGNUM] = (frame_info)->frame + 0x30; \
	373	(frame_saved_regs).regs[R5_REGNUM] = (frame_info)->frame + 0x34; \
	374	(frame_saved_regs).regs[R6_REGNUM] = (frame_info)->frame + 0x38; \
	375	(frame_saved_regs).regs[R7_REGNUM] = (frame_info)->frame + 0x3C; \
	376	}
	377	\f
	378	/* Things needed for making the inferior call functions. */
	379
841c051c JG	380	#define CALL_DUMMY_LOCATION BEFORE_TEXT_END
841c051c JG	381	#define NEED_TEXT_START_END
dd3b648e RP	382
	383	/* Push an empty stack frame, to record the current PC, etc. */
	384
	385	#define PUSH_DUMMY_FRAME \
	386	{ register CORE_ADDR sp = read_register (SP_REGNUM); \
	387	register int regnum; \
	388	for (regnum = 0; regnum < FP_REGNUM; regnum++) \
	389	sp = push_word (sp, read_register (regnum)); \
	390	sp = push_word (sp, read_register (PS_REGNUM)); \
	391	sp = push_word (sp, read_register (PC_REGNUM)); \
	392	write_register (SP_REGNUM, sp);}
	393
	394	/* Discard from the stack the innermost frame,
	395	restoring all saved registers. */
	396
	397	#define POP_FRAME \
	398	{ CORE_ADDR sp = read_register(SP_REGNUM); \
	399	REGISTER_TYPE reg; \
	400	int regnum; \
	401	for(regnum = 0;regnum < FP_REGNUM;regnum++){ \
	402	sp-=sizeof(REGISTER_TYPE); \
	403	read_memory(sp,&reg,sizeof(REGISTER_TYPE)); \
	404	write_register(regnum,reg);} \
	405	sp-=sizeof(REGISTER_TYPE); \
	406	read_memory(sp,&reg,sizeof(REGISTER_TYPE)); \
	407	write_register(PS_REGNUM,reg); \
	408	sp-=sizeof(REGISTER_TYPE); \
	409	read_memory(sp,&reg,sizeof(REGISTER_TYPE)); \
	410	write_register(PC_REGNUM,reg);}
	411
	412	/* MJD - Size of dummy frame pushed onto stack by PUSH_DUMMY_FRAME */
	413
	414	#define DUMMY_FRAME_SIZE (0x48)
	415
	416	/* MJD - The sequence of words in the instructions is
	417	halt
	418	halt
	419	halt
	420	halt
	421	subr b2,stack size,0 grab stack space for dummy call
	422	labr b3,x0(b2),0 set AP_REGNUM to point at arguments
	423	lw r2,x8(b3),0 load r2 with first argument
	424	lwbr b1,arguments size(b2),0 load address of function to be called
	425	brlnk r1,x8(b1),0 call function
	426	halt
	427	halt
	428	labr b2,stack size(b2),0 give back stack
	429	break break
	430	*/
	431
	432	#define CALL_DUMMY {0x00000000, \
	433	0x00000000, \
	434	0x59000000, \
	435	0x598a0000, \
	436	0xb5030008, \
	437	0x5c820000, \
	438	0x44810008, \
	439	0x00000000, \
	440	0x590a0000, \
	441	0x28090000 }
	442
	443	#define CALL_DUMMY_LENGTH 40
	444
	445	#define CALL_DUMMY_START_OFFSET 8
446
447	#define CALL_DUMMY_STACK_ADJUST 8
448
449	/* MJD - Fixup CALL_DUMMY for the specific function call.
450	OK heres the problems
451	1) On a trap there are two copies of the stack pointer, one in SP_REGNUM
452	which is read/write and one in FP_REGNUM which is only read. It seems
453	that when restarting the GOULD NP1 uses FP_REGNUM's value.
454	2) Loading function address into b1 looks a bit difficult if bigger than
455	0x0000fffc, infact from what I can tell the compiler sets up table of
456	function address in base3 through which function calls are referenced.
457
458	OK my solutions
459	Calculate the size of the dummy stack frame and do adjustments of
460	SP_REGNUM in the dummy call.
461	Push function address onto the stack and load it in the dummy call
462	*/
463
464	#define FIX_CALL_DUMMY(dummyname, sp, fun, nargs, args, type, gcc_p) \
465	{ int i;\
466	int arg_len = 0, total_len;\
467	old_sp = push_word(old_sp,fun);\
468	for(i = nargs - 1;i >= 0;i--)\
469	arg_len += TYPE_LENGTH (VALUE_TYPE (value_arg_coerce (args[i])));\
470	if(struct_return)\
471	arg_len += TYPE_LENGTH(value_type);\
472	total_len = DUMMY_FRAME_SIZE+CALL_DUMMY_STACK_ADJUST+4+arg_len;\
473	dummyname[0] += total_len;\
474	dummyname[2] += total_len;\
475	dummyname[5] += arg_len+CALL_DUMMY_STACK_ADJUST;\
476	dummyname[8] += total_len;}
477
478	/* MJD - So the stack should end up looking like this
479
480	\| Normal stack frame \|
481	\| from normal program \|
482	\| flow \|
483	+---------------------+ <- Final sp - 0x08 - argument size
484	\| \| - 0x4 - dummy_frame_size
485	\| Pushed dummy frame \|
486	\| b0-b7, r0-r7 \|
487	\| pc and ps \|
488	\| \|
489	+---------------------+
490	\| Function address \|
491	+---------------------+ <- Final sp - 0x8 - arguments size
492	\| \|
493	\| \|
494	\| \|
495	\| Arguments to \|
496	\| Function \|
497	\| \|
498	\| \|
499	\| \|
500	+---------------------+ <- Final sp - 0x8
501	\| Dummy_stack_adjust \|
502	+---------------------+ <- Final sp
503	\| \|
504	\| where call will \|
505	\| build frame \|
506	*/