155126Storek /* 255126Storek * Copyright (c) 1992 The Regents of the University of California. 355126Storek * All rights reserved. 455126Storek * 555126Storek * This software was developed by the Computer Systems Engineering group 655126Storek * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 755126Storek * contributed to Berkeley. 855126Storek * 955501Sbostic * All advertising materials mentioning features or use of this software 1055501Sbostic * must display the following acknowledgement: 1155501Sbostic * This product includes software developed by the University of 1255501Sbostic * California, Lawrence Berkeley Laboratories. 1355501Sbostic * 1455126Storek * %sccs.include.redist.c% 1555126Storek * 16*56566Storek * @(#)stdarg.h 7.3 (Berkeley) 10/15/92 1755126Storek * 18*56566Storek * from: $Header: stdarg.h,v 1.6 92/10/02 00:08:01 torek Exp $ 1955126Storek */ 2055126Storek 2155126Storek /* 2255126Storek * SPARC stdarg.h 2355126Storek */ 2455126Storek 2555126Storek #ifndef _MACHINE_STDARG_H 2655126Storek #define _MACHINE_STDARG_H 2755126Storek 2855126Storek typedef char *va_list; 2955126Storek 3055126Storek /* 3155126Storek * va_start sets ap to point to the first variable argument. 3255126Storek * The `last fixed argument' parameter l is ignored (and should 3355126Storek * never have been included in the ANSI standard!). 3455126Storek * 3555126Storek * va_end cleans up after va_start. There is nothing to do there. 3655126Storek */ 3755126Storek #define va_start(ap, l) (__builtin_saveregs(), \ 3855126Storek ap = (char *)__builtin_next_arg()) 3955126Storek #define va_end(ap) /* empty */ 4055126Storek 41*56566Storek #if __GNUC__ == 1 42*56566Storek #define __extension__ /* hack for bootstrapping via gcc 1.x */ 43*56566Storek #endif 44*56566Storek 4555126Storek /* 46*56566Storek * va_arg picks up the next argument of type `ty'. Appending an 47*56566Storek * asterisk to ty must produce a pointer to ty (i.e., ty may not be, 48*56566Storek * e.g., `int (*)()'). In addition, ty must not be any type which 4955126Storek * undergoes promotion to some other type (e.g., char): it must 5055126Storek * be the promoted type instead. 51*56566Storek * 52*56566Storek * Gcc-2.x tries to use ldd/std for double and quad_t values, but Sun's 53*56566Storek * brain-damaged calling convention does not quad-align these. Thus, 54*56566Storek * for 8-byte arguments, we have to pick up the actual value four bytes 55*56566Storek * at a time, and use type punning (i.e., a union) to produce the result. 56*56566Storek * (We could also do this with a libc function, actually, by returning 57*56566Storek * 8 byte integers in %o0+%o1 and the same 8 bytes as a double in %f0+%f1.) 5855126Storek */ 59*56566Storek #define va_arg(ap, ty) \ 60*56566Storek (sizeof(ty) == 8 ? __extension__ ({ \ 61*56566Storek union { ty __d; int __i[2]; } __u; \ 62*56566Storek __u.__i[0] = ((int *)(ap))[0]; \ 63*56566Storek __u.__i[1] = ((int *)(ap))[1]; \ 64*56566Storek (ap) += 8; \ 65*56566Storek __u.__d; }) : \ 66*56566Storek ((ty *)(ap += sizeof(ty)))[-1]) 6755126Storek 6855126Storek #endif /* _MACHINE_STDARG_H */ 69