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/* $OpenBSD: SYS.h,v 1.11 2016/05/18 20:21:13 guenther Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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. 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 5.5 (Berkeley) 5/7/91
* $NetBSD: SYS.h,v 1.9 2006/01/06 06:19:20 uwe Exp $
*/
#include <machine/asm.h>
#include <sys/syscall.h>
/*
* We need to offset the TCB pointer (in register gbr) by this much:
* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb)
* That's negative on a variant I arch like sh, but you can't directly
* load negative numbers or use them as displacements. Ha! So this is the
* negative of the real value and we'll explicitly subtract it in the asm
*/
#define TCB_OFFSET_ERRNO_NEG 8
/*
* 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) SET_ENTRY_SIZE(x); \
_HIDDEN_FALIAS(x,x); \
SET_ENTRY_SIZE(_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) \
SET_ENTRY_SIZE(_thread_sys_ ## x); \
_HIDDEN_FALIAS(x,_thread_sys_ ## x); \
SET_ENTRY_SIZE(_HIDDEN(x))
#define __END(x) \
__END_HIDDEN(x); SET_ENTRY_SIZE(x)
#define SYSTRAP(x) \
mov.l 903f, r0; \
.word 0xc380; /* trapa #0x80; */ \
bra 904f; \
nop; \
.align 2; \
903: .long (SYS_ ## x); \
904:
#define _SYSCALL_NOERROR(x,y) \
SYSENTRY(x); \
SYSTRAP(y)
#define _SYSCALL_HIDDEN_NOERROR(x,y) \
SYSENTRY_HIDDEN(x); \
SYSTRAP(y)
#define SET_ERRNO_AND_RETURN \
stc gbr,r1; \
mov #TCB_OFFSET_ERRNO_NEG,r2; \
sub r2,r1; \
mov.l r0,@r1; \
mov #-1, r1; \
rts; \
mov #-1, r0
#define _SYSCALL(x,y) \
.text; \
911: SET_ERRNO_AND_RETURN; \
_SYSCALL_NOERROR(x,y); \
bf 911b
#define _SYSCALL_HIDDEN(x,y) \
.text; \
911: SET_ERRNO_AND_RETURN; \
_SYSCALL_HIDDEN_NOERROR(x,y); \
bf 911b
#define SYSCALL_NOERROR(x) \
_SYSCALL_NOERROR(x,x)
#define SYSCALL(x) \
_SYSCALL(x,x)
#define PSEUDO_NOERROR(x,y) \
_SYSCALL_NOERROR(x,y); \
rts; \
nop; \
__END(x)
#define PSEUDO(x,y) \
_SYSCALL(x,y); \
rts; \
nop; \
__END(x)
#define PSEUDO_HIDDEN(x,y) \
_SYSCALL_HIDDEN(x,y); \
rts; \
nop; \
__END_HIDDEN(x)
#define RSYSCALL_NOERROR(x) PSEUDO_NOERROR(x,x)
#define RSYSCALL(x) PSEUDO(x,x)
#define RSYSCALL_HIDDEN(x) PSEUDO_HIDDEN(x,x)
#define SYSCALL_END(x) __END(x)
#define SYSCALL_END_HIDDEN(x) __END_HIDDEN(x)
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