1 /*- 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)SYS.h 8.1 (Berkeley) 6/4/93 38 * 39 * from: Header: SYS.h,v 1.2 92/07/03 18:57:00 torek Exp 40 * $NetBSD: SYS.h,v 1.7 2002/01/14 00:55:56 thorpej Exp $ 41 */ 42 43 #include <machine/asm.h> 44 #include <sys/syscall.h> 45 #include <machine/trap.h> 46 47 #ifdef __STDC__ 48 #define _CAT(x,y) x##y 49 #else 50 #define _CAT(x,y) x/**/y 51 #endif 52 53 /* 54 * ERROR branches to cerror. This is done with a macro so that I can 55 * change it to be position independent later, if need be. 56 */ 57 #ifdef PIC 58 #define CALL(name) \ 59 PIC_PROLOGUE(%g1,%g2); \ 60 sethi %hi(name),%g2; \ 61 or %g2,%lo(name),%g2; \ 62 ldx [%g1+%g2],%g2; \ 63 jmp %g2; \ 64 nop 65 #else 66 #define CALL(name) \ 67 sethi %hi(name),%g1; or %lo(name),%g1,%g1; \ 68 jmp %g1; nop 69 #endif 70 #define ERROR() CALL(_C_LABEL(__cerror)) 71 72 /* 73 * SYSCALL is used when further action must be taken before returning. 74 * Note that it adds a `nop' over what we could do, if we only knew what 75 * came at label 1.... 76 */ 77 #define _SYSCALL(x,y) \ 78 ENTRY(x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1: 79 80 #define SYSCALL(x) \ 81 _SYSCALL(x,x) 82 83 /* 84 * RSYSCALL is used when the system call should just return. Here 85 * we use the SYSCALL_G2RFLAG to put the `success' return address in %g2 86 * and avoid a branch. 87 */ 88 #define RSYSCALL(x) \ 89 ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \ 90 t ST_SYSCALL; ERROR() 91 92 /* 93 * PSEUDO(x,y) is like RSYSCALL(y) except that the name is x. 94 */ 95 #define PSEUDO(x,y) \ 96 ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \ 97 t ST_SYSCALL; ERROR() 98 99 /* 100 * WSYSCALL(weak,strong) is like RSYSCALL(weak), except that weak is 101 * a weak internal alias for the strong symbol. 102 */ 103 #define WSYSCALL(weak,strong) \ 104 WEAK_ALIAS(weak,strong); \ 105 PSEUDO(strong,weak) 106 107 /* 108 * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls 109 * that never fail. 110 * 111 * XXX - This should be optimized. 112 */ 113 #define SYSCALL_NOERROR(x) \ 114 ENTRY(x); mov _CAT(SYS_,x),%g1; t ST_SYSCALL 115 116 /* 117 * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls 118 * that never fail. 119 * 120 * XXX - This should be optimized. 121 */ 122 #define RSYSCALL_NOERROR(x) \ 123 ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \ 124 t ST_SYSCALL 125 126 /* 127 * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y) except that the name is x. 128 */ 129 #define PSEUDO_NOERROR(x,y) \ 130 ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \ 131 t ST_SYSCALL 132 133 .globl _C_LABEL(__cerror) 134