/*	$OpenBSD: SYS.h,v 1.28 2023/12/10 16:45:51 deraadt Exp $	*/
/*-
 * Copyright (c) 1994
 *	Andrew Cagney.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)SYS.h	8.1 (Berkeley) 6/4/93
 */

#include <sys/syscall.h>

/* r0 will be a non zero errno if there was an error, while r3/r4 will
   contain the return value */

#include "DEFS.h"


/* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */
#define	TCB_OFFSET_ERRNO	(-8)
/* from <powerpc/tcb.h>: TCB address == %r2 - TCB_OFFSET */
#define	TCB_OFFSET		0x7000

/* offset of errno from %r2 */
#define	R2_OFFSET_ERRNO		(-TCB_OFFSET + TCB_OFFSET_ERRNO)

#define SYSENTRY(x)		WEAK_ALIAS(x, _thread_sys_ ## x);	\
				ENTRY(_thread_sys_ ## x)
#define SYSENTRY_HIDDEN(x)	ENTRY(_thread_sys_ ## x)
#define __END_HIDDEN(x)		END(_thread_sys_ ## x);			\
				_HIDDEN_FALIAS(x, _thread_sys_ ## x);	\
				END(_HIDDEN(x))
#define __END(x)		__END_HIDDEN(x); END(x)

#define	PSEUDO_NOERROR(x,y)	SYSENTRY(x)				\
				RETGUARD_SETUP(x, %r11, %r12);		\
				li	%r0, SYS_ ## y ;		\
			97:	sc;					\
				PINSYSCALL(SYS_ ## y, 97b);		\
				RETGUARD_CHECK(x, %r11, %r12);		\
				blr;					\
				__END(x)

#define	PSEUDO_HIDDEN(x,y)	SYSENTRY_HIDDEN(x)			\
				RETGUARD_SETUP(x, %r11, %r12);		\
				li	%r0, SYS_ ## y;			\
			97:	sc;					\
				PINSYSCALL(SYS_ ## y, 97b);		\
				cmpwi	%r0, 0;				\
				beq+	.L_ret;				\
				stw	%r0, R2_OFFSET_ERRNO(2);	\
				li	%r3, -1;			\
				li	%r4, -1;	/* for lseek */	\
			.L_ret:						\
				RETGUARD_CHECK(x, %r11, %r12);		\
				blr;					\
				__END_HIDDEN(x)

#define	PSEUDO(x,y)		WEAK_ALIAS(x, _thread_sys_ ## x);	\
				PSEUDO_HIDDEN(x,y);			\
				END(x)

#define RSYSCALL(x)		PSEUDO(x,x)
#define RSYSCALL_HIDDEN(x)	PSEUDO_HIDDEN(x,x)
#define SYSCALL_END_HIDDEN(x)	__END_HIDDEN(x)
#define SYSCALL_END(x)		__END(x)