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/* $OpenBSD: SYS.h,v 1.25 2020/11/28 19:49:30 gkoehler 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 "machine/asm.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)
/*
* We define a hidden alias with the prefix "_libc_" for each global symbol
* that may be used internally. By referencing _libc_x instead of x, other
* parts of libc prevent overriding by the application and avoid unnecessary
* relocations.
*/
#define _HIDDEN(x) _libc_##x
#define _HIDDEN_ALIAS(x,y) \
STRONG_ALIAS(_HIDDEN(x),y); \
.hidden _HIDDEN(x)
#define _HIDDEN_FALIAS(x,y) \
_HIDDEN_ALIAS(x,y); \
.type _HIDDEN(x),@function
/*
* For functions implemented in ASM that aren't syscalls.
* END_STRONG(x) Like DEF_STRONG() in C; for standard/reserved C names
* END_WEAK(x) Like DEF_WEAK() in C; for non-ISO C names
*/
#define END_STRONG(x) END(x); _HIDDEN_FALIAS(x,x); END(_HIDDEN(x))
#define END_WEAK(x) END_STRONG(x); .weak x
#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 ; \
sc; \
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; \
sc; \
cmpwi %r0, 0; \
beq+ .L_ret; \
stw %r0, R2_OFFSET_ERRNO(2); \
li %r3, -1; \
li %r4, -1; /* for __syscall(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)
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