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/* $OpenBSD: SYS.h,v 1.24 2023/12/10 16:45:51 deraadt Exp $ */
/*
* Copyright (c) 1998-2002 Michael Shalayeff
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 MIND
* 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.
*/
#include <sys/syscall.h>
#include <machine/asm.h>
#undef _LOCORE
#define _LOCORE
#include <machine/frame.h>
#include <machine/vmparam.h>
#undef _LOCORE
/* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */
#define TCB_OFFSET_ERRNO -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.
* EXIT_STRONG(x) Like DEF_STRONG() in C; for standard/reserved C names
* EXIT_WEAK(x) Like DEF_WEAK() in C; for non-ISO C names
* ALTEXIT_STRONG(x) and ALTEXIT_WEAK()
* Matching macros for ALTENTRY functions
*/
#define ALTEXIT_STRONG(x) \
_HIDDEN_FALIAS(x,x) !\
.size _HIDDEN(x), . - _HIDDEN(x)
#define ALTEXIT_WEAK(x) ALTEXIT_STRONG(x) !\
.weak x
#define EXIT_STRONG(x) EXIT(x) !\
ALTEXIT_STRONG(x)
#define EXIT_WEAK(x) EXIT_STRONG(x) !\
.weak x
#define PINSYSCALL(sysno, label) \
.pushsection .openbsd.syscalls,"",@progbits !\
.long label !\
.long sysno !\
.popsection
#define SYSENTRY(x) !\
LEAF_ENTRY(__CONCAT(_thread_sys_,x)) !\
WEAK_ALIAS(x,__CONCAT(_thread_sys_,x))
#define SYSENTRY_HIDDEN(x) !\
LEAF_ENTRY(__CONCAT(_thread_sys_,x))
#define SYSEXIT(x) !\
SYSEXIT_HIDDEN(x) !\
.size x, . - x
#define SYSEXIT_HIDDEN(x) !\
EXIT(__CONCAT(_thread_sys_,x)) !\
_HIDDEN_FALIAS(x,_thread_sys_##x) !\
.size _HIDDEN(x), . - _HIDDEN(x)
#define SYSCALL(x) !\
stw rp, HPPA_FRAME_ERP(sr0,sp) !\
ldil L%SYSCALLGATE, r1 !\
97: ble 4(sr7, r1) !\
PINSYSCALL(__CONCAT(SYS_,x), 97b) !\
ldi __CONCAT(SYS_,x), t1 !\
comb,= 0, t1, 1f !\
ldw HPPA_FRAME_ERP(sr0,sp), rp !\
/* set errno */ \
mfctl cr27, r1 !\
stw t1, TCB_OFFSET_ERRNO(r1) !\
ldi -1, ret0 !\
bv r0(rp) !\
ldi -1, ret1 /* for lseek */ !\
1:
#define PSEUDO(x,y) !\
SYSENTRY(x) !\
SYSCALL(y) !\
bv r0(rp) !\
nop !\
SYSEXIT(x)
#define PSEUDO_HIDDEN(x,y) !\
SYSENTRY_HIDDEN(x) !\
SYSCALL(y) !\
bv r0(rp) !\
nop !\
SYSEXIT_HIDDEN(x)
#define PSEUDO_NOERROR(x,y) !\
SYSENTRY(x) !\
stw rp, HPPA_FRAME_ERP(sr0,sp) !\
ldil L%SYSCALLGATE, r1 !\
97: ble 4(sr7, r1) !\
PINSYSCALL(__CONCAT(SYS_,x), 97b) !\
ldi __CONCAT(SYS_,x), t1 !\
ldw HPPA_FRAME_ERP(sr0,sp), rp !\
bv r0(rp) !\
nop !\
SYSEXIT(x)
#define RSYSCALL(x) PSEUDO(x,x)
#define RSYSCALL_HIDDEN(x) PSEUDO_HIDDEN(x,x)
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