/* vacall function for hppa 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.
*/
/*---------------------------------------------------------------------------
HPPA Argument Passing Conventions:
The calling conventions for anonymous functions and for explicitly named
functions are different. Only the convention for explicitly named functions
matters here.
All arguments, except the first 4 words, are passed on the stack
- growing down! - with word alignment. Doubles take two words and force
double alignment. Structures args are passed as true structures embedded
in the argument stack. They force double alignment and - if they don't
fit entirely in the 4 register words - are passed in memory.
The first 2 words are passed like this:
%r26 = first integer arg, %r25 = second integer arg, or
%fr4L = first float arg, %fr5L = second float arg, or
%fr5 = double arg.
Similarly for the next 2 words, passed in %r24 and %r23, or
%fr6L and %fr7L, or
%fr7.
To return a structure, the called function copies the return value to
the address supplied in register "%r28".
---------------------------------------------------------------------------*/
#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__("%r29");
#endif
register void* sret __asm__("%r28");
register long arg1 __asm__("%r26");
register long arg2 __asm__("%r25");
register long arg3 __asm__("%r24");
register long arg4 __asm__("%r23");
register float farg1 __asm__("%fr4"); /* fr4L */
register float farg2 __asm__("%fr5"); /* fr5L */
register float farg3 __asm__("%fr6"); /* fr6L */
register float farg4 __asm__("%fr7"); /* fr7L */
register double darg1 __asm__("%fr5");
register double darg2 __asm__("%fr7");
register int iret __asm__("%r28");
register float fret __asm__("%fr4"); /* fr4L */
register double dret __asm__("%fr4");
register __vaword iret1 __asm__("%r28");
register __vaword iret2 __asm__("%r29");
void /* the return type is variable, not void! */
__vacall (__vaword word1, __vaword word2, __vaword word3, __vaword word4,
__vaword firstword)
{
/* gcc-2.6.3 source says: When a parameter is passed in a register,
* stack space is still allocated for it.
*/
/* Note about stack offsets (see vacall-hppa.s):
* &firstword = %r30 - 244, &word4 = %r30 - 240, ..., &word1 = %r30 - 228,
*/
__va_alist list;
/* Move the arguments passed in registers to their stack locations. */
&word1; /* (&firstword)[4] = word1; */
&word2; /* (&firstword)[3] = word2; */
&word3; /* (&firstword)[2] = word3; */
&word4; /* (&firstword)[1] = word4; */
list.darg[1] = darg1;
list.darg[0] = darg2;
list.farg[3] = farg1;
list.farg[2] = farg2;
list.farg[1] = farg3;
list.farg[0] = farg4;
/* Prepare the va_alist. */
list.flags = 0;
list.aptr = (long)(&firstword + 5);
list.raddr = (void*)0;
list.rtype = __VAvoid;
list.structraddr = sret;
list.memargptr = (long)(&firstword + 1);
list.farg_offset = (long)&list.farg[4] - list.aptr;
list.darg_offset = (long)&list.darg[2] - list.aptr;
/* 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) {
iret1 = ((__vaword *) &list.tmp._longlong)[0];
iret2 = ((__vaword *) &list.tmp._longlong)[1];
} else
if (list.rtype == __VAfloat) {
fret = list.tmp._float;
iret1 = list.tmp._words[0]; /* HP cc generates a RTNVAL=GR call */
} else
if (list.rtype == __VAdouble) {
dret = list.tmp._double;
iret1 = list.tmp._words[0]; /* HP cc generates a RTNVAL=GR call */
iret2 = list.tmp._words[1]; /* i.e. result is expected in r28,r29 */
} else
if (list.rtype == __VAvoidp) {
iret = (long)list.tmp._ptr;
} else
if (list.rtype == __VAstruct) {
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) {
if (list.flags & __VA_OLDGCC_STRUCT_RETURN) {
/* gcc <= 2.6.3 returns structs of size 1,2,4 in registers. */
if (list.rsize == sizeof(char)) {
iret = *(unsigned char *) list.raddr;
} else
if (list.rsize == sizeof(short)) {
iret = *(unsigned short *) list.raddr;
} else
if (list.rsize == sizeof(int)) {
iret = *(unsigned int *) list.raddr;
}
} else {
/* cc, c89 and gcc >= 2.7 return structs of size <= 8 in registers. */
if (list.rsize > 0 && list.rsize <= 8) {
if (list.rsize == 1) {
iret = ((unsigned char *) list.raddr)[0];
} else
if (list.rsize == 2) {
iret = (((unsigned char *) list.raddr)[0] << 8)
| ((unsigned char *) list.raddr)[1];
} else
if (list.rsize == 3) {
iret = (((unsigned char *) list.raddr)[0] << 16)
| (((unsigned char *) list.raddr)[1] << 8)
| ((unsigned char *) list.raddr)[2];
} else
if (list.rsize == 4) {
iret = (((unsigned char *) list.raddr)[0] << 24)
| (((unsigned char *) list.raddr)[1] << 16)
| (((unsigned char *) list.raddr)[2] << 8)
| ((unsigned char *) list.raddr)[3];
} else
if (list.rsize == 5) {
iret1 = (((unsigned char *) list.raddr)[0] << 24)
| (((unsigned char *) list.raddr)[1] << 16)
| (((unsigned char *) list.raddr)[2] << 8)
| ((unsigned char *) list.raddr)[3];
iret2 = ((unsigned char *) list.raddr)[4];
} else
if (list.rsize == 6) {
iret1 = (((unsigned char *) list.raddr)[0] << 24)
| (((unsigned char *) list.raddr)[1] << 16)
| (((unsigned char *) list.raddr)[2] << 8)
| ((unsigned char *) list.raddr)[3];
iret2 = (((unsigned char *) list.raddr)[4] << 8)
| ((unsigned char *) list.raddr)[5];
} else
if (list.rsize == 7) {
iret1 = (((unsigned char *) list.raddr)[0] << 24)
| (((unsigned char *) list.raddr)[1] << 16)
| (((unsigned char *) list.raddr)[2] << 8)
| ((unsigned char *) list.raddr)[3];
iret2 = (((unsigned char *) list.raddr)[4] << 16)
| (((unsigned char *) list.raddr)[5] << 8)
| ((unsigned char *) list.raddr)[6];
} else
if (list.rsize == 8) {
iret1 = (((unsigned char *) list.raddr)[0] << 24)
| (((unsigned char *) list.raddr)[1] << 16)
| (((unsigned char *) list.raddr)[2] << 8)
| ((unsigned char *) list.raddr)[3];
iret2 = (((unsigned char *) list.raddr)[4] << 24)
| (((unsigned char *) list.raddr)[5] << 16)
| (((unsigned char *) list.raddr)[6] << 8)
| ((unsigned char *) list.raddr)[7];
}
}
}
}
}
}
}