1 /* $OpenBSD: SYS.h,v 1.6 2002/01/03 01:11:10 art Exp $ */ 2 /*- 3 * Copyright (c) 1992, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This software was developed by the Computer Systems Engineering group 7 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 8 * contributed to Berkeley. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)SYS.h 8.1 (Berkeley) 6/4/93 39 * 40 * from: Header: SYS.h,v 1.2 92/07/03 18:57:00 torek Exp 41 * $NetBSD: SYS.h,v 1.6 2001/07/23 07:26:50 thorpej Exp $ 42 */ 43 44 #include <machine/asm.h> 45 #include <sys/syscall.h> 46 #include <machine/trap.h> 47 48 #ifdef __STDC__ 49 #define _CAT(x,y) x##y 50 #else 51 #define _CAT(x,y) x/**/y 52 #endif 53 54 #define __ENTRY(p,x) ENTRY(_CAT(p,x)) ; .weak x; x = _CAT(p,x) 55 56 /* 57 * ERROR branches to cerror. This is done with a macro so that I can 58 * change it to be position independent later, if need be. 59 */ 60 #ifdef PIC 61 #define CALL(name) \ 62 PIC_PROLOGUE(%g1,%g2); \ 63 sethi %hi(name),%g2; \ 64 or %g2,%lo(name),%g2; \ 65 ldx [%g1+%g2],%g2; \ 66 jmp %g2; \ 67 nop 68 #else 69 #define CALL(name) \ 70 sethi %hi(name),%g1; or %lo(name),%g1,%g1; \ 71 jmp %g1; nop 72 #endif 73 #define ERROR() CALL(_C_LABEL(__cerror)) 74 75 /* 76 * SYSCALL is used when further action must be taken before returning. 77 * Note that it adds a `nop' over what we could do, if we only knew what 78 * came at label 1.... 79 */ 80 #define _SYSCALL(p,x,y) \ 81 __ENTRY(p,x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1: 82 83 #define __SYSCALL(p,x) \ 84 _SYSCALL(p,x,x) 85 86 /* 87 * RSYSCALL is used when the system call should just return. Here 88 * we use the SYSCALL_G2RFLAG to put the `success' return address in %g2 89 * and avoid a branch. 90 */ 91 #define __RSYSCALL(p,x) \ 92 __ENTRY(p,x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \ 93 t ST_SYSCALL; ERROR() 94 95 /* 96 * PSEUDO(x,y) is like RSYSCALL(y) except that the name is x. 97 */ 98 #define __PSEUDO(p,x,y) \ 99 __ENTRY(p,x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \ 100 t ST_SYSCALL; ERROR() 101 102 /* 103 * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls 104 * that never fail. 105 * 106 * XXX - This should be optimized. 107 */ 108 #define __SYSCALL_NOERROR(p,x) \ 109 __ENTRY(p,x); mov _CAT(SYS_,x),%g1; t ST_SYSCALL 110 111 /* 112 * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls 113 * that never fail. 114 * 115 * XXX - This should be optimized. 116 */ 117 #define __RSYSCALL_NOERROR(p,x) \ 118 __ENTRY(p,x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \ 119 t ST_SYSCALL 120 121 /* 122 * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y) except that the name is x. 123 */ 124 #define __PSEUDO_NOERROR(p,x,y) \ 125 __ENTRY(p,x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \ 126 t ST_SYSCALL 127 128 .globl _C_LABEL(__cerror) 129 130 /* 131 * SYSENTRY is for functions that pretend to be syscalls. 132 */ 133 #define __SYSENTRY(p,x) __ENTRY(p,x) 134 135 #define SYSCALL(x) __SYSCALL(_thread_sys_,x) 136 #define RSYSCALL(x) __RSYSCALL(_thread_sys_,x) 137 #define RSYSCALL_NOERROR(x,y) __RSYSCALL_NOERROR(_thread_sys_,x,y) 138 #define PSEUDO(x,y) __PSEUDO(_thread_sys_,x,y) 139 #define PSEUDO_NOERROR(x,y) __PSEUDO_NOERROR(_thread_sys_,x,y) 140 #define SYSENTRY(x) __SYSENTRY(_thread_sys_,x) 141