/* vacall function for sparc CPU */

/*
 * Copyright 1995 Bruno Haible, <haible@ma2s2.mathematik.uni-karlsruhe.de>
 *
 * This is free software distributed under the GNU General Public Licence
 * described in the file COPYING. Contact the author if you don't have this
 * or can't live with it. There is ABSOLUTELY NO WARRANTY, explicit or implied,
 * on this software.
 */

#include "vacall.h.in"

register __vaword* fp	__asm__("%fp");	/* our %fp, caller's %sp */
register __vaword* ret	__asm__("%i7");	/* %i7+8 = return address */
register int	iret	__asm__("%i0");
register float	fret	__asm__("%f0");	/* %f0 */
register double	dret	__asm__("%f0");	/* %f0,%f1 */

void /* the return type is variable, not void! */
vacall (__vaword word1, __vaword word2, __vaword word3, __vaword word4,
        __vaword word5, __vaword word6,
        __vaword firstword)
{
  __va_alist list;
  /* gcc-2.6.3 source says: When a parameter is passed in a register,
   * stack space is still allocated for it.
   */
  /* Move the arguments passed in registers to their stack locations. */
  (&firstword)[-6] = word1;
  (&firstword)[-5] = word2;
  (&firstword)[-4] = word3;
  (&firstword)[-3] = word4;
  (&firstword)[-2] = word5;
  (&firstword)[-1] = word6;
  /* Prepare the va_alist. */
  list.flags = 0;
  list.aptr = (long)(&firstword - 6);
  list.raddr = (void*)0;
  list.rtype = __VAvoid;
  list.structraddr = (void*)((&firstword)[-7]); /* = (void*) fp[16] */
  /* Call vacall_function. The macros do all the rest. */
  (*vacall_function) (&list);
  /* Put return value into proper register. */
  switch (list.rtype)
    {
      case __VAvoid:	break;
      case __VAchar:	iret = list.tmp._char; break;
      case __VAschar:	iret = list.tmp._schar; break;
      case __VAuchar:	iret = list.tmp._uchar; break;
      case __VAshort:	iret = list.tmp._short; break;
      case __VAushort:	iret = list.tmp._ushort; break;
      case __VAint:	iret = list.tmp._int; break;
      case __VAuint:	iret = list.tmp._uint; break;
      case __VAlong:	iret = list.tmp._long; break;
      case __VAulong:	iret = list.tmp._ulong; break;
      case __VAfloat:
        if (list.flags & __VA_SUNCC_FLOAT_RETURN)
          dret = (double)list.tmp._float;
        else
          fret = list.tmp._float;
        break;
      case __VAdouble:  dret = list.tmp._double; break;
      case __VAvoidp:	iret = (long)list.tmp._ptr; break;
      case __VAstruct:
        if (list.flags & __VA_SUNCC_STRUCT_RETURN)
          { /* Sun cc struct return convention. */
            /* The desired struct return address was passed in fp[16], later on
             * list.raddr = list.structraddr = fp[16]. Now the result has
             * already been copied there. No need to copy the result once more.
             * The caller expects to recieve the struct return address in %o0.
             */
            iret = (long) list.raddr;
            if ((list.rsize & 0xfff) == ret[2])
              ret++; /* skip the "unimp n" instruction at the return address */
              /* else the "unimp n" instruction will cause a core dump */
          }
        else if (list.flags & __VA_PCC_STRUCT_RETURN)
          { /* pcc struct return convention */
            iret = (long) list.raddr;
          }
        else
          { /* normal struct return convention */
            if (list.flags & __VA_SMALL_STRUCT_RETURN)
              switch (list.rsize)
                { case sizeof(char):  iret = *(unsigned char *) list.raddr; goto done;
                  case sizeof(short): iret = *(unsigned short *) list.raddr; goto done;
                  case sizeof(int):   iret = *(unsigned int *) list.raddr; goto done;
                  default:            break;
                }
            ret++; /* skip the "unimp n" instruction at the return address */
            done: ;
          }
        break;
    }
}