1/*	$OpenBSD: SYS.h,v 1.28 2023/12/10 16:45:51 deraadt Exp $	*/
2/*-
3 * Copyright (c) 1994
4 *	Andrew Cagney.  All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Ralph Campbell.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed by the University of
20 *	California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *	from: @(#)SYS.h	8.1 (Berkeley) 6/4/93
38 */
39
40#include <sys/syscall.h>
41
42/* r0 will be a non zero errno if there was an error, while r3/r4 will
43   contain the return value */
44
45#include "DEFS.h"
46
47
48/* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */
49#define	TCB_OFFSET_ERRNO	(-8)
50/* from <powerpc/tcb.h>: TCB address == %r2 - TCB_OFFSET */
51#define	TCB_OFFSET		0x7000
52
53/* offset of errno from %r2 */
54#define	R2_OFFSET_ERRNO		(-TCB_OFFSET + TCB_OFFSET_ERRNO)
55
56#define SYSENTRY(x)		WEAK_ALIAS(x, _thread_sys_ ## x);	\
57				ENTRY(_thread_sys_ ## x)
58#define SYSENTRY_HIDDEN(x)	ENTRY(_thread_sys_ ## x)
59#define __END_HIDDEN(x)		END(_thread_sys_ ## x);			\
60				_HIDDEN_FALIAS(x, _thread_sys_ ## x);	\
61				END(_HIDDEN(x))
62#define __END(x)		__END_HIDDEN(x); END(x)
63
64#define	PSEUDO_NOERROR(x,y)	SYSENTRY(x)				\
65				RETGUARD_SETUP(x, %r11, %r12);		\
66				li	%r0, SYS_ ## y ;		\
67			97:	sc;					\
68				PINSYSCALL(SYS_ ## y, 97b);		\
69				RETGUARD_CHECK(x, %r11, %r12);		\
70				blr;					\
71				__END(x)
72
73#define	PSEUDO_HIDDEN(x,y)	SYSENTRY_HIDDEN(x)			\
74				RETGUARD_SETUP(x, %r11, %r12);		\
75				li	%r0, SYS_ ## y;			\
76			97:	sc;					\
77				PINSYSCALL(SYS_ ## y, 97b);		\
78				cmpwi	%r0, 0;				\
79				beq+	.L_ret;				\
80				stw	%r0, R2_OFFSET_ERRNO(2);	\
81				li	%r3, -1;			\
82				li	%r4, -1;	/* for lseek */	\
83			.L_ret:						\
84				RETGUARD_CHECK(x, %r11, %r12);		\
85				blr;					\
86				__END_HIDDEN(x)
87
88#define	PSEUDO(x,y)		WEAK_ALIAS(x, _thread_sys_ ## x);	\
89				PSEUDO_HIDDEN(x,y);			\
90				END(x)
91
92#define RSYSCALL(x)		PSEUDO(x,x)
93#define RSYSCALL_HIDDEN(x)	PSEUDO_HIDDEN(x,x)
94#define SYSCALL_END_HIDDEN(x)	__END_HIDDEN(x)
95#define SYSCALL_END(x)		__END(x)
96
97