#ifndef _avcall_m68k_c /*-*- C -*-*/
#define _avcall_m68k_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 !!!
Foreign function interface for a m68k Sun3 with gcc/sun-cc.
This calls a C function with an argument list built up using macros
defined in av_call.h.
M68k Argument Passing Conventions:
All arguments are passed on the stack with word alignment. Doubles take
two words. Structure args 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 "a1". Gcc without
-fpcc-struct-return returns <= 4 byte structures as integers.
Compile this routine with gcc -O (or -O2 or -g -O) to get the right
register variables, or use the assembler version.
----------------------------------------------------------------------*/
#include "avcall.h.in"
#define RETURN(TYPE,VAL) (*(TYPE*)l->raddr = (TYPE)(VAL))
int
__builtin_avcall(av_alist* l)
{
register __avword* sp __asm__("sp"); /* C names for registers */
register __avword* sret __asm__("a1"); /* structure return pointer */
/*register __avword iret __asm__("d0"); */
register __avword iret2 __asm__("d1");
register float fret __asm__("d0"); /* d0 */
register double dret __asm__("d0"); /* d0,d1 */
register float fp_fret __asm__("fp0");
register double fp_dret __asm__("fp0");
__avword* argframe = (sp -= __AV_ALIST_WORDS); /* make room for argument list */
int arglen = l->aptr - l->args;
__avword i;
__avword i2;
for (i = 0; i < arglen; i++) /* push function args onto stack */
argframe[i] = l->args[i];
if (l->rtype == __AVstruct) /* push struct return address */
__asm__("move%.l %0,%/a1" : : "g" (l->raddr));
i = (*l->func)(); /* call function */
i2 = iret2;
/* 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] = i2;
} else
if (l->rtype == __AVfloat) {
if (l->flags & __AV_FREG_FLOAT_RETURN) {
RETURN(float, fp_fret);
} else {
if (l->flags & __AV_SUNCC_FLOAT_RETURN) {
RETURN(float, (float)dret);
} else {
RETURN(float, fret);
}
}
} else
if (l->rtype == __AVdouble) {
if (l->flags & __AV_FREG_FLOAT_RETURN) {
RETURN(double, fp_dret);
} else {
RETURN(double, dret);
}
} else
if (l->rtype == __AVvoidp) {
RETURN(void*, i);
} else
if (l->rtype == __AVstruct) {
/* NB: On m68k, all structure sizes are divisible by 2. */
if (l->flags & __AV_REGISTER_STRUCT_RETURN) {
if (l->rsize == sizeof(char)) { /* can't occur */
RETURN(char, i);
goto done;
} else
if (l->rsize == sizeof(short)) {
RETURN(short, i);
goto done;
} else
if (l->rsize == sizeof(int)) {
RETURN(int, i);
goto done;
} else
if (l->rsize == 2*sizeof(__avword)) {
((__avword*)l->raddr)[0] = i;
((__avword*)l->raddr)[1] = i2;
goto done;
}
}
if (l->flags & __AV_PCC_STRUCT_RETURN) {
/* pcc struct return convention: need a *(TYPE*)l->raddr = *(TYPE*)i; */
if (l->rsize == sizeof(char)) { /* can't occur */
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 */
}
done: ;
}
sp += __AV_ALIST_WORDS;
return 0;
}
#endif /*_avcall_m68k_c */