#ifndef _avcall_powerpc64_c /*-*- C -*-*/
#define _avcall_powerpc64_c
/**
Copyright 1993 Bill Triggs, <Bill.Triggs@inrialpes.fr>
Copyright 1995-2006 Bruno Haible, <bruno@clisp.org>
Copyright 2000 Adam Fedor, <fedor@gnu.org>
Copyright 2004 Paul Guyot, <pguyot@kallisys.net>
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 64-bit PowerPC with gcc
This calls a C function with an argument list built up using macros
defined in avcall.h.
PowerPC64 Argument Passing Conventions:
All arguments, except the first 8 words, are passed on the stack with
word alignment. The first 13 doubles and floats are also passed in
floating-point-registers.
To return a structure, the called function copies the value to space
pointed to by its first argument, and all other arguments are shifted
down by one.
The AIX argument passing conventions are used:
- the first 13 doubles and floats are passed in FP registers,
and when they do, there is still room allocated for them in the
argument sequence (integer regs or stack).
- Structures are passed in the argument sequence. But structures
containing floats or doubles are passed in FP registers?!
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 STACK_OFFSET 14
#define RETURN(TYPE,VAL) (*(TYPE*)l->raddr = (TYPE)(VAL))
register double farg1 __asm__("fr1");
register double farg2 __asm__("fr2");
register double farg3 __asm__("fr3");
register double farg4 __asm__("fr4");
register double farg5 __asm__("fr5");
register double farg6 __asm__("fr6");
register double farg7 __asm__("fr7");
register double farg8 __asm__("fr8");
register double farg9 __asm__("fr9");
register double farg10 __asm__("fr10");
register double farg11 __asm__("fr11");
register double farg12 __asm__("fr12");
register double farg13 __asm__("fr13");
int
__builtin_avcall(av_alist* l)
{
register __avword* sp __asm__("r1"); /* C names for registers */
/*register __avword iret __asm__("r3"); */
register __avword iret2 __asm__("r4");
register float fret __asm__("fr1");
register double dret __asm__("fr1");
__avword space[__AV_ALIST_WORDS]; /* space for callee's stack frame */
__avword* argframe = sp + STACK_OFFSET;/* stack offset for argument list */
int arglen = l->aptr - l->args;
__avword i;
for (i = 8; i < arglen; i++) /* push function args onto stack */
argframe[i-8] = l->args[i];
/* pass first 13 floating-point args in registers */
arglen = l->faptr - l->fargs;
if (arglen == 0) goto fargs0;
else if (arglen == 1) goto fargs1;
else if (arglen == 2) goto fargs2;
else if (arglen == 3) goto fargs3;
else if (arglen == 4) goto fargs4;
else if (arglen == 5) goto fargs5;
else if (arglen == 6) goto fargs6;
else if (arglen == 7) goto fargs7;
else if (arglen == 8) goto fargs8;
else if (arglen == 9) goto fargs9;
else if (arglen == 10) goto fargs10;
else if (arglen == 11) goto fargs11;
else if (arglen == 12) goto fargs12;
else if (arglen == 13) goto fargs13;
fargs13: farg13 = l->fargs[12];
fargs12: farg12 = l->fargs[11];
fargs11: farg11 = l->fargs[10];
fargs10: farg10 = l->fargs[9];
fargs9: farg9 = l->fargs[8];
fargs8: farg8 = l->fargs[7];
fargs7: farg7 = l->fargs[6];
fargs6: farg6 = l->fargs[5];
fargs5: farg5 = l->fargs[4];
fargs4: farg4 = l->fargs[3];
fargs3: farg3 = l->fargs[2];
fargs2: farg2 = l->fargs[1];
fargs1: farg1 = l->fargs[0];
fargs0: ;
/* 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) {
RETURN(long long, i);
} else
if (l->rtype == __AVulonglong) {
RETURN(unsigned long long, i);
} 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) {
/* __AV_PCC_STRUCT_RETURN and __AV_REGISTER_STRUCT_RETURN are ignored */
}
return 0;
}
#endif /*_avcall_powerpc64_c */