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/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

/* 	handle_sregs.c,v 1.3 1995/08/21 08:44:43 john Exp	 */

#ifndef lint

static char vcid[] = "handle_sregs.c,v 1.3 1995/08/21 08:44:43 john Exp";

#endif /* lint */

/*

  handle_sregs.c

  This file contains code to handle preserved registers.

*/

#include "config.h"

#include "alpha_ins.h"

#include "inst_fmt.h"

#include "addresstypes.h"

#include "expmacs.h"

#include "frames.h"

#include "reg_defs.h"

#include "maxminmacs.h"

#include "fail.h"

extern long frame_size;

extern int arg_stack_space;

extern int in_general_proc;

int  dumpstart;		/* where to start dumping fixeds */

int  fldumpstart;		/* where to start dumping floats */

int  fixdump;			/* all the fixeds to be dumped */

int  floatdump;		/* all the floats to be dumped */

int  fixdone;			/* the fixeds which have already been

				   dumped */

int  fltdone;			/* the floats which have already been

				   dumped */

baseoff dump_baseoff

    PROTO_N ( ( dstart ) )

    PROTO_T ( int dstart )

{

  baseoff b;

  b.base = Has_vcallees?local_reg:(Has_fp?FP:SP);

  if(in_general_proc) {

    b.offset = (Has_vcallees)?(dstart - (frame_size>>3)):

      (Has_fp)?(dstart - (arg_stack_space+((frame_size+callee_size)>>3))):dstart;

  }

  else {

    b.offset = (Has_vcallees)?(dstart - (frame_size>>3)):

      (Has_fp)?(dstart - ((frame_size+callee_size)>>3)):dstart;

  }

  return b;

}

/*

** Dump registers to the stack.

*/

void dump_sregs

    PROTO_N ( ( fdi, fldi ) )

    PROTO_T ( unsigned int fdi X unsigned int fldi )

{

  unsigned int mask = 1<<31;

  int  ds=dumpstart-8;

  int fds=fldumpstart-8;

  unsigned int fd = fdi;

  unsigned int fld = fldi;

  baseoff b;

  int   i;

  b = dump_baseoff(ds);

  for(i=31;(fd!=0)&&(mask!=0);i--){

    if(fixdump&mask){

      /*b.offset = (ds +=8 );*/

      b.offset += 8;

      if(fd & mask){

	load_store(i_stq,i,b);

	fd &= ~mask;

      }	

    }

    mask>>=1;

  }

  if(fd!=0) failer("fd <> 0");

  mask=1<<31;

  b = dump_baseoff(fds);

  for (i = 31; (fld != 0)&&(mask!=0); i--){

    if (floatdump&mask) {

      b.offset += 8;

      /*b.offset = (fds+=8);*/

      if (fld & mask){

	fld &= ~mask;

	float_load_store(i_stt,i,b);

      }	

    }	

    mask>>=1;

  }

  if(fld!=0)failer("float dump failed\n");

  fixdone |= fdi;

  fltdone |= fldi;

}

/*

  restore registers from stack.

*/

void restore_sregs

    PROTO_N ( ( fd, fld ) )

    PROTO_T ( unsigned int fd X unsigned int fld )

{

  unsigned int mask = 1<<31;

  int ds=dumpstart-8;

  int fds=fldumpstart-8;

  baseoff b = dump_baseoff(ds);

  int   i;

  for (i = 31; (fd != 0)&&(mask!=0); i--) {

    if (fixdump & mask) {

      b.offset += 8;

      /*b.offset = (ds+=8);*/

      if (fd & mask) {

	load_store(i_ldq,i,b);

	fd &= ~mask;

      }

    }

    mask >>= 1;

  }

  if(fd != 0) failer("fd<>0");

  b = dump_baseoff(fds);

  mask = 1<<31;

  for (i = 31; (fld != 0)&(mask!=0); i--) {

    if (floatdump & mask) {

      b.offset += 8;

      /*b.offset = (fds+=8);*/

      if (fld & mask) {

	float_load_store(i_ldt,i,b);

	fld &= ~mask;

      }

    }

    mask = mask>>1;

  }

}