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/* vacall function for arm CPU */
/*
* Copyright 1995-2004 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.
*/
#ifndef REENTRANT
#include "vacall.h.in"
#else /* REENTRANT */
#include "vacall_r.h.in"
#endif
#ifdef REENTRANT
#define __vacall __vacall_r
register struct { void (*vacall_function) (void*,va_alist); void* arg; }
* env __asm__("r12");
#endif
register __vaword iret __asm__("r0");
register __vaword iret2 __asm__("r1");
register float fret __asm__("f0");
register double dret __asm__("f0");
void /* the return type is variable, not void! */
__vacall (__vaword word1, __vaword word2, __vaword word3, __vaword word4,
__vaword firstword)
{
struct { long retaddr, arg1, arg2, arg3, arg4; } args;
__va_alist list;
/* MAGIC ALERT!
* This is the last struct on the stack, so that
* &args + 1 == &return_address == &firstword - 1.
* Look at the assembly code to convince yourself.
*/
/* Move the arguments passed in registers to their stack locations. */
args.retaddr = (&firstword)[-1]; /* save the return address */
(&firstword)[-4] = word1;
(&firstword)[-3] = word2;
(&firstword)[-2] = word3;
(&firstword)[-1] = word4;
/* Prepare the va_alist. */
list.flags = 0;
list.aptr = (long)(&firstword - 4);
list.raddr = (void*)0;
list.rtype = __VAvoid;
/* Call vacall_function. The macros do all the rest. */
#ifndef REENTRANT
(*vacall_function) (&list);
#else /* REENTRANT */
(*env->vacall_function) (env->arg,&list);
#endif
/* Put return value into proper register. */
if (list.rtype == __VAvoid) {
} else
if (list.rtype == __VAchar) {
iret = list.tmp._char;
} else
if (list.rtype == __VAschar) {
iret = list.tmp._schar;
} else
if (list.rtype == __VAuchar) {
iret = list.tmp._uchar;
} else
if (list.rtype == __VAshort) {
iret = list.tmp._short;
} else
if (list.rtype == __VAushort) {
iret = list.tmp._ushort;
} else
if (list.rtype == __VAint) {
iret = list.tmp._int;
} else
if (list.rtype == __VAuint) {
iret = list.tmp._uint;
} else
if (list.rtype == __VAlong) {
iret = list.tmp._long;
} else
if (list.rtype == __VAulong) {
iret = list.tmp._ulong;
} else
if (list.rtype == __VAlonglong || list.rtype == __VAulonglong) {
iret = ((__vaword *) &list.tmp._longlong)[0];
iret2 = ((__vaword *) &list.tmp._longlong)[1];
} else
if (list.rtype == __VAfloat) {
fret = list.tmp._float;
} else
if (list.rtype == __VAdouble) {
dret = list.tmp._double;
} else
if (list.rtype == __VAvoidp) {
iret = (long)list.tmp._ptr;
} else
if (list.rtype == __VAstruct) {
/* NB: On arm, all structure sizes are divisible by 4. */
if (list.flags & __VA_PCC_STRUCT_RETURN) {
/* pcc struct return convention */
iret = (long) list.raddr;
} else {
/* normal struct return convention */
if (list.flags & __VA_REGISTER_STRUCT_RETURN) {
if (list.rsize == sizeof(char)) { /* can't occur */
iret = *(unsigned char *) list.raddr;
} else
if (list.rsize == sizeof(short)) { /* can't occur */
iret = *(unsigned short *) list.raddr;
} else
if (list.rsize == sizeof(int)) {
iret = *(unsigned int *) list.raddr;
} else
if (list.rsize == 2*sizeof(__vaword)) {
iret = ((__vaword *) list.raddr)[0];
iret2 = ((__vaword *) list.raddr)[1];
}
}
}
}
(&firstword)[-1] = args.retaddr; /* restore the return address */
}
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