#ifndef _avcall_hppa_c /*-*- C -*-*/
#define _avcall_hppa_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 HP Precision Architecture 1.0 with gcc
This calls a C function with an argument list built up using macros
defined in av_call.h.
HPPA Argument Passing Conventions:
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. Small 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
%r26 = high word of double arg, %r25 = low word of double arg.
Similarly for the next 2 words, passed in %r24 and %r23.
Note that other calling conventions would be in effect if we would call
an explicitly named function!
To return a structure, the called function copies the return value to
the address supplied in register "%r28".
It is forbidden to modify the stack pointer.
Compile this routine with gcc -O2 -fomit-frame-pointer to get the right
register variables, then replace the -120 in the second save statement
"stw %r3,-120(0,%r30)" by -1060, or use the assembler version.
----------------------------------------------------------------------*/
#include "avcall.h.in"
#define RETURN(TYPE,VAL) (*(TYPE*)l->raddr = (TYPE)(VAL))
/* This declaration tells gcc not to modify %r28. */
register __avword* sret __asm__("%r28"); /* structure return pointer */
int
__builtin_avcall(av_alist* l)
{
register __avword* sp __asm__("%r30"); /* C names for registers */
register float fret __asm__("%fr4");
register double dret __asm__("%fr4");
/*register __avword iret1 __asm__("%r28"); */
register __avword iret2 __asm__("%r29");
__avword space[__AV_ALIST_WORDS]; /* space for callee's stack frame */
__avword* argframe = sp - 8; /* stack offset for argument list */
int arglen = &l->args[__AV_ALIST_WORDS] - l->aptr;
__avword i;
{
int i;
for (i = -arglen; i < -4; i++) /* push function args onto stack */
argframe[i] = l->args[__AV_ALIST_WORDS+i];
}
if (l->rtype == __AVstruct) /* push struct return address */
sret = l->raddr;
/* call function, pass 4 args in registers */
i = (*l->func)(l->args[__AV_ALIST_WORDS-1], l->args[__AV_ALIST_WORDS-2],
l->args[__AV_ALIST_WORDS-3], l->args[__AV_ALIST_WORDS-4]);
/* 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->flags & __AV_OLDGCC_STRUCT_RETURN) {
/* gcc <= 2.6.3 returns structs of size 1,2,4 in registers. */
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);
}
} else {
/* cc, c89 and gcc >= 2.7 return structs of size <= 8 in registers. */
if (l->rsize == 1) {
((unsigned char *)l->raddr)[0] = (unsigned char)(i);
} else
if (l->rsize == 2) {
((unsigned char *)l->raddr)[0] = (unsigned char)(i>>8);
((unsigned char *)l->raddr)[1] = (unsigned char)(i);
} else
if (l->rsize == 3) {
((unsigned char *)l->raddr)[0] = (unsigned char)(i>>16);
((unsigned char *)l->raddr)[1] = (unsigned char)(i>>8);
((unsigned char *)l->raddr)[2] = (unsigned char)(i);
} else
if (l->rsize == 4) {
((unsigned char *)l->raddr)[0] = (unsigned char)(i>>24);
((unsigned char *)l->raddr)[1] = (unsigned char)(i>>16);
((unsigned char *)l->raddr)[2] = (unsigned char)(i>>8);
((unsigned char *)l->raddr)[3] = (unsigned char)(i);
} else
if (l->rsize == 5) {
((unsigned char *)l->raddr)[0] = (unsigned char)(i>>24);
((unsigned char *)l->raddr)[1] = (unsigned char)(i>>16);
((unsigned char *)l->raddr)[2] = (unsigned char)(i>>8);
((unsigned char *)l->raddr)[3] = (unsigned char)(i);
((unsigned char *)l->raddr)[4] = (unsigned char)(iret2);
} else
if (l->rsize == 6) {
((unsigned char *)l->raddr)[0] = (unsigned char)(i>>24);
((unsigned char *)l->raddr)[1] = (unsigned char)(i>>16);
((unsigned char *)l->raddr)[2] = (unsigned char)(i>>8);
((unsigned char *)l->raddr)[3] = (unsigned char)(i);
((unsigned char *)l->raddr)[4] = (unsigned char)(iret2>>8);
((unsigned char *)l->raddr)[5] = (unsigned char)(iret2);
} else
if (l->rsize == 7) {
((unsigned char *)l->raddr)[0] = (unsigned char)(i>>24);
((unsigned char *)l->raddr)[1] = (unsigned char)(i>>16);
((unsigned char *)l->raddr)[2] = (unsigned char)(i>>8);
((unsigned char *)l->raddr)[3] = (unsigned char)(i);
((unsigned char *)l->raddr)[4] = (unsigned char)(iret2>>16);
((unsigned char *)l->raddr)[5] = (unsigned char)(iret2>>8);
((unsigned char *)l->raddr)[6] = (unsigned char)(iret2);
} else
if (l->rsize == 8) {
((unsigned char *)l->raddr)[0] = (unsigned char)(i>>24);
((unsigned char *)l->raddr)[1] = (unsigned char)(i>>16);
((unsigned char *)l->raddr)[2] = (unsigned char)(i>>8);
((unsigned char *)l->raddr)[3] = (unsigned char)(i);
((unsigned char *)l->raddr)[4] = (unsigned char)(iret2>>24);
((unsigned char *)l->raddr)[5] = (unsigned char)(iret2>>16);
((unsigned char *)l->raddr)[6] = (unsigned char)(iret2>>8);
((unsigned char *)l->raddr)[7] = (unsigned char)(iret2);
}
}
}
}
}
return 0;
}
#endif /*_avcall_hppa_c */