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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;
  }
}