1 /* $NetBSD: SYS.h,v 1.19 2009/12/14 01:07:41 matt Exp $ */ 2 3 /*- 4 * Copyright (c) 1996 Jonathan Stone 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Jonathan Stone for 18 * the NetBSD Project. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /*- 35 * Copyright (c) 1991, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * This code is derived from software contributed to Berkeley by 39 * Ralph Campbell. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * from: @(#)SYS.h 8.1 (Berkeley) 6/4/93 66 */ 67 68 #include <sys/syscall.h> 69 #include <mips/asm.h> 70 71 72 /* 73 * If compiling for shared libs, Emit sysV ABI PIC segment pseudo-ops. 74 * 75 * i) Emit .abicalls before .LEAF entrypoint, and .cpload/.cprestore after. 76 * ii) Do interprocedure jumps indirectly via t9, with the side-effect of 77 * preserving the callee's entry address in t9. 78 */ 79 #ifdef __ABICALLS__ 80 .abicalls 81 # if defined(__mips_o32) || defined(__mips_o64) 82 # define PIC_PROLOGUE(x) SETUP_GP 83 # define PIC_TAILCALL(l) PTR_LA t9, _C_LABEL(l); jr t9 84 # define PIC_RETURN() j ra 85 # else 86 # define PIC_PROLOGUE(x) SETUP_GP64(t3, x) 87 # define PIC_TAILCALL(l) PTR_LA t9, _C_LABEL(l); RESTORE_GP64; jr t9 88 # define PIC_RETURN() RESTORE_GP64; j ra 89 # endif 90 #else 91 # define PIC_PROLOGUE(x) 92 # define PIC_TAILCALL(l) j _C_LABEL(l) 93 # define PIC_RETURN() 94 #endif /* __ABICALLS__ */ 95 96 97 #ifdef __STDC__ 98 # define SYSTRAP(x) li v0,SYS_ ## x; syscall; 99 #else 100 # define SYSTRAP(x) li v0,SYS_/**/x; syscall; 101 #endif 102 103 104 /* 105 * Do a syscall that cannot fail (sync, get{p,u,g,eu,eg)id) 106 */ 107 #define RSYSCALL_NOERROR(x) \ 108 PSEUDO_NOERROR(x,x) 109 110 /* 111 * Do a normal syscall. 112 */ 113 #define RSYSCALL(x) \ 114 PSEUDO(x,x) 115 116 /* 117 * Do a syscall that has an internal name and a weak external alias. 118 */ 119 #define WSYSCALL(weak,strong) \ 120 WEAK_ALIAS(weak,strong); \ 121 PSEUDO(strong,weak) 122 123 /* 124 * Do a renamed or pseudo syscall (e.g., _exit()), where the entrypoint 125 * and syscall name are not the same. 126 */ 127 #define PSEUDO_NOERROR(x,y) \ 128 LEAF(x); \ 129 SYSTRAP(y); \ 130 j ra; \ 131 END(x) 132 133 #define PSEUDO(x,y) \ 134 LEAF(x); \ 135 PIC_PROLOGUE(x); \ 136 SYSTRAP(y); \ 137 bne a3,zero,err; \ 138 PIC_RETURN(); \ 139 err: \ 140 PIC_TAILCALL(__cerror); \ 141 END(x) 142