1 /* $NetBSD: SYS.h,v 1.12 2002/05/26 12:24:58 wiz Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)SYS.h 8.1 (Berkeley) 6/4/93 40 * 41 * from: Header: SYS.h,v 1.2 92/07/03 18:57:00 torek 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 /* 55 * ERROR branches to cerror. This is done with a macro so that I can 56 * change it to be position independent later, if need be. 57 */ 58 #ifdef PIC 59 #ifdef BIGPIC 60 #define JUMP(name) \ 61 PIC_PROLOGUE(%g1,%g5); \ 62 sethi %hi(_C_LABEL(name)),%g5; \ 63 or %g5,%lo(_C_LABEL(name)),%g5; \ 64 ldx [%g1+%g5],%g5; \ 65 jmp %g5; \ 66 nop 67 #else 68 #define JUMP(name) \ 69 PIC_PROLOGUE(%g1,%g5); \ 70 ldx [%g1+_C_LABEL(name)],%g5; jmp %g5; nop 71 #endif 72 #else 73 #define JUMP(name) set _C_LABEL(name),%g1; jmp %g1; nop 74 #endif 75 #define ERROR() JUMP(__cerror) 76 /* 77 * SYSCALL is used when further action must be taken before returning. 78 * Note that it adds a `nop' over what we could do, if we only knew what 79 * came at label 1.... 80 */ 81 #define _SYSCALL(x,y) \ 82 ENTRY(x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1: 83 84 #define SYSCALL(x) \ 85 _SYSCALL(x,x) 86 87 /* 88 * RSYSCALL is used when the system call should just return. Here 89 * we use the SYSCALL_G7RFLAG to put the `success' return address in %g7 90 * and avoid a branch. 91 */ 92 #define RSYSCALL(x) \ 93 ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G7RFLAG,%g1; add %o7,8,%g7; \ 94 t ST_SYSCALL; ERROR() 95 96 /* 97 * PSEUDO(x,y) is like RSYSCALL(y) except that the name is x. 98 */ 99 #define PSEUDO(x,y) \ 100 ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G7RFLAG,%g1; add %o7,8,%g7; \ 101 t ST_SYSCALL; ERROR() 102 103 /* 104 * WSYSCALL(weak,strong) is like RSYSCALL(weak), except that weak is 105 * a weak internal alias for the strong symbol. 106 */ 107 #define WSYSCALL(weak,strong) \ 108 WEAK_ALIAS(weak,strong); \ 109 PSEUDO(strong,weak) 110 111 /* 112 * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls 113 * that never fail. 114 * 115 * XXX - This should be optimized. 116 */ 117 #define SYSCALL_NOERROR(x) \ 118 ENTRY(x); mov _CAT(SYS_,x),%g1; t ST_SYSCALL 119 120 /* 121 * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls 122 * that never fail. 123 * 124 * XXX - This should be optimized. 125 */ 126 #define RSYSCALL_NOERROR(x) \ 127 ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G7RFLAG,%g1; add %o7,8,%g7; \ 128 t ST_SYSCALL 129 130 /* 131 * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y) except that the name is x. 132 */ 133 #define PSEUDO_NOERROR(x,y) \ 134 ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G7RFLAG,%g1; add %o7,8,%g7; \ 135 t ST_SYSCALL 136 137 .register %g7,#scratch 138 139 .globl _C_LABEL(__cerror) 140