/* $OpenBSD: SYS.h,v 1.5 2023/12/10 16:45:52 deraadt Exp $ */ /*- * Copyright (c) 2020 Brian Bamsch <bbamsch@google.com> * 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 */ #include "DEFS.h" #include <sys/syscall.h> /* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */ #define TCB_OFFSET_ERRNO (-12) /* offset of errno from tp */ #define TP_OFFSET_ERRNO TCB_OFFSET_ERRNO #define SYSENTRY(x) \ .weak x; \ 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 SYSTRAP(x) \ li t0, SYS_ ## x; \ 97: ecall; \ PINSYSCALL(SYS_ ## x, 97b) #define HANDLE_ERROR() \ beqz t0, 200f; \ sw a0, TP_OFFSET_ERRNO(tp); \ li a0, -1; \ 200: #define HANDLE_ERROR_TARGET(target) \ beqz t0, 200f; \ sw a0, TP_OFFSET_ERRNO(tp); \ li a0, -1; \ j target; \ 200: #define _SYSCALL_NOERROR(x,y) \ SYSENTRY(x); \ SYSTRAP(y) #define _SYSCALL_HIDDEN_NOERROR(x,y) \ SYSENTRY_HIDDEN(x); \ SYSTRAP(y) #define _SYSCALL(x, y) \ _SYSCALL_NOERROR(x,y); \ HANDLE_ERROR() \ #define _SYSCALL_HIDDEN(x, y) \ _SYSCALL_HIDDEN_NOERROR(x,y); \ HANDLE_ERROR() \ #define SYSCALL_NOERROR(x) \ _SYSCALL_NOERROR(x,x) #define SYSCALL(x) \ _SYSCALL(x,x) #define PSEUDO_NOERROR(x,y) \ SYSENTRY(x); \ RETGUARD_SETUP(x, t6); \ SYSTRAP(y); \ RETGUARD_CHECK(x, t6); \ ret; \ __END(x) #define PSEUDO(x,y) \ SYSENTRY(x); \ RETGUARD_SETUP(x, t6); \ SYSTRAP(y); \ HANDLE_ERROR(); \ RETGUARD_CHECK(x, t6); \ ret; \ __END(x) #define PSEUDO_HIDDEN(x,y) \ SYSENTRY_HIDDEN(x); \ RETGUARD_SETUP(x, t6); \ SYSTRAP(y); \ HANDLE_ERROR(); \ RETGUARD_CHECK(x, t6); \ ret; \ __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)
