File ffcall/avcall/avcall-m88k.c from the latest check-in

#ifndef _avcall_m88k_c				/*-*- C -*-*/
#define _avcall_m88k_c
/**
  Copyright 1993 Bill Triggs, <Bill.Triggs@inrialpes.fr>
  Copyright 1995-1999 Bruno Haible, <bruno@clisp.org>

  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.
**/
/*----------------------------------------------------------------------
  !!! THIS ROUTINE MUST BE COMPILED gcc -O -fno-omit-frame-pointer !!!

  Foreign function interface for a M88000 with gcc.

  This calls a C function with an argument list built up using macros
  defined in av_call.h.

  M88k Argument Passing Conventions:

  All arguments, except the non-structs among the first 8 words, are passed
  on the stack with word alignment. Doubles take two words and force double
  alignment. Scalars among the first 8 words are passed in registers.
  Structure args are are passed as true structures embedded in the argument
  stack.

  To return a structure, the called function copies the return value to the
  address supplied in register "r12".

  Compile this routine with gcc -O (or -O2 -fno-omit-frame-pointer or -g -O)
  to get the right register variables. For other compilers use the
  pre-compiled assembler version.
  ----------------------------------------------------------------------*/
#include "avcall.h.in"

#define RETURN(TYPE,VAL)	(*(TYPE*)l->raddr = (TYPE)(VAL))

register __avword*	sret	__asm__("r12");  /* structure return pointer */

int
__builtin_avcall(av_alist* l)
{
  register __avword*	sp	__asm__("r31");	/* C names for registers */
/*register __avword	iret	__asm__("r2"); */
  register __avword	iret2	__asm__("r3");
  register float	fret	__asm__("r2");
  register double	dret	__asm__("r2");

  __avword* argframe = (sp -= __AV_ALIST_WORDS); /* make room for argument list */
  int arglen = l->aptr - l->args;
  __avword i;

  for (i = 0; i < arglen; i++)		/* push function args onto stack */
    argframe[i] = l->args[i];

  if (l->rtype == __AVstruct)		/* pass struct return address */
    sret = l->raddr;

				/* call function, pass 8 args in registers */
  i = (*l->func)(l->args[0], l->args[1], l->args[2], l->args[3],
		 l->args[4], l->args[5], l->args[6], l->args[7]);

  /* save return value */
  if (l->rtype == __AVvoid) {
  } else
  if (l->rtype == __AVword) {
    RETURN(__avword, i);
  } else
  if (l->rtype == __AVchar) {
    RETURN(char, i);
  } else
  if (l->rtype == __AVschar) {
    RETURN(signed char, i);
  } else
  if (l->rtype == __AVuchar) {
    RETURN(unsigned char, i);
  } else
  if (l->rtype == __AVshort) {
    RETURN(short, i);
  } else
  if (l->rtype == __AVushort) {
    RETURN(unsigned short, i);
  } else
  if (l->rtype == __AVint) {
    RETURN(int, i);
  } else
  if (l->rtype == __AVuint) {
    RETURN(unsigned int, i);
  } else
  if (l->rtype == __AVlong) {
    RETURN(long, i);
  } else
  if (l->rtype == __AVulong) {
    RETURN(unsigned long, i);
  } else
  if (l->rtype == __AVlonglong || l->rtype == __AVulonglong) {
    ((__avword*)l->raddr)[0] = i;
    ((__avword*)l->raddr)[1] = iret2;
  } else
  if (l->rtype == __AVfloat) {
    RETURN(float, fret);
  } else
  if (l->rtype == __AVdouble) {
    RETURN(double, dret);
  } else
  if (l->rtype == __AVvoidp) {
    RETURN(void*, i);
  } else
  if (l->rtype == __AVstruct) {
    if (l->flags & __AV_PCC_STRUCT_RETURN) {
      /* pcc struct return convention: need a  *(TYPE*)l->raddr = *(TYPE*)i;  */
      if (l->rsize == sizeof(char)) {
        RETURN(char, *(char*)i);
      } else
      if (l->rsize == sizeof(short)) {
        RETURN(short, *(short*)i);
      } else
      if (l->rsize == sizeof(int)) {
        RETURN(int, *(int*)i);
      } else
      if (l->rsize == sizeof(double)) {
        ((int*)l->raddr)[0] = ((int*)i)[0];
        ((int*)l->raddr)[1] = ((int*)i)[1];
      } else {
        int n = (l->rsize + sizeof(__avword)-1)/sizeof(__avword);
        while (--n >= 0)
          ((__avword*)l->raddr)[n] = ((__avword*)i)[n];
      }
    } else {
      /* normal struct return convention */
      if (l->flags & __AV_SMALL_STRUCT_RETURN) {
        if (l->rsize == sizeof(char)) {
          RETURN(char, i);
        } else
        if (l->rsize == sizeof(short)) {
          RETURN(short, i);
        } else
        if (l->rsize == sizeof(int)) {
          RETURN(int, i);
        }
      }
    }
  }
  sp += __AV_ALIST_WORDS;
  return 0;
}

#endif /*_avcall_m88k_c */