94 lines
3.4 KiB
C
94 lines
3.4 KiB
C
/* $OpenBSD: SYS.h,v 1.27 2023/02/11 06:10:39 guenther Exp $ */
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/*-
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* Copyright (c) 1994
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* Andrew Cagney. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ralph Campbell.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)SYS.h 8.1 (Berkeley) 6/4/93
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*/
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#include <sys/syscall.h>
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/* r0 will be a non zero errno if there was an error, while r3/r4 will
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contain the return value */
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#include "DEFS.h"
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/* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */
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#define TCB_OFFSET_ERRNO (-8)
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/* from <powerpc/tcb.h>: TCB address == %r2 - TCB_OFFSET */
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#define TCB_OFFSET 0x7000
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/* offset of errno from %r2 */
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#define R2_OFFSET_ERRNO (-TCB_OFFSET + TCB_OFFSET_ERRNO)
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#define SYSENTRY(x) WEAK_ALIAS(x, _thread_sys_ ## x); \
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ENTRY(_thread_sys_ ## x)
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#define SYSENTRY_HIDDEN(x) ENTRY(_thread_sys_ ## x)
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#define __END_HIDDEN(x) END(_thread_sys_ ## x); \
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_HIDDEN_FALIAS(x, _thread_sys_ ## x); \
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END(_HIDDEN(x))
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#define __END(x) __END_HIDDEN(x); END(x)
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#define PSEUDO_NOERROR(x,y) SYSENTRY(x) \
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RETGUARD_SETUP(x, %r11, %r12); \
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li %r0, SYS_ ## y ; \
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sc; \
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RETGUARD_CHECK(x, %r11, %r12); \
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blr; \
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__END(x)
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#define PSEUDO_HIDDEN(x,y) SYSENTRY_HIDDEN(x) \
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RETGUARD_SETUP(x, %r11, %r12); \
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li %r0, SYS_ ## y; \
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sc; \
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cmpwi %r0, 0; \
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beq+ .L_ret; \
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stw %r0, R2_OFFSET_ERRNO(2); \
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li %r3, -1; \
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li %r4, -1; /* for lseek */ \
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.L_ret: \
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RETGUARD_CHECK(x, %r11, %r12); \
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blr; \
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__END_HIDDEN(x)
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#define PSEUDO(x,y) WEAK_ALIAS(x, _thread_sys_ ## x); \
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PSEUDO_HIDDEN(x,y); \
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END(x)
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#define RSYSCALL(x) PSEUDO(x,x)
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#define RSYSCALL_HIDDEN(x) PSEUDO_HIDDEN(x,x)
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#define SYSCALL_END_HIDDEN(x) __END_HIDDEN(x)
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#define SYSCALL_END(x) __END(x)
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