1 /* $NetBSD: SYS.h,v 1.10 1997/06/17 16:35:26 jonathan 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. All advertising materials mentioning features or use of this software 50 * must display the following acknowledgement: 51 * This product includes software developed by the University of 52 * California, Berkeley and its contributors. 53 * 4. Neither the name of the University nor the names of its contributors 54 * may be used to endorse or promote products derived from this software 55 * without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 67 * SUCH DAMAGE. 68 * 69 * from: @(#)SYS.h 8.1 (Berkeley) 6/4/93 70 */ 71 72 #include <sys/syscall.h> 73 #include <mips/asm.h> 74 75 76 /* 77 * If compiling for shared libs, Emit sysV ABI PIC segment pseudo-ops. 78 * 79 * i) Emit .abicalls before .LEAF entrypoint, and .cpload/.cprestore after. 80 * ii) Do interprocedure jumps indirectly via t9, with the side-effect of 81 * preserving the callee's entry address in t9. 82 */ 83 #ifdef ABICALLS 84 # define PIC_LEAF(x,sr) \ 85 .abicalls; LEAF(x); .set noreorder; .cpload sr; .set reorder 86 # define PIC_CALL(l,sr) la sr, _C_LABEL(l); jr sr 87 #else 88 # define PIC_LEAF(x,sr) LEAF(x) 89 # define PIC_CALL(l,sr) j _C_LABEL(l) 90 #endif 91 92 93 #ifdef __STDC__ 94 # define SYSTRAP(x) li v0,SYS_ ## x; syscall; 95 #else 96 # define SYSTRAP(x) li v0,SYS_/**/x; syscall; 97 #endif 98 99 100 /* 101 * Helper macro: produce a possibly-PIC entry point 'x' that syscalls 'y'. 102 */ 103 #define PIC_SYSTRAP(x,y) \ 104 PIC_LEAF(x,t9); \ 105 SYSTRAP(y) 106 107 /* 108 * Do a syscall that cannot fail (sync, get{p,u,g,eu,eg)id) 109 */ 110 #define RSYSCALL_NOERROR(x) \ 111 PSEUDO_NOERROR(x,x) 112 113 /* 114 * Do a normal syscall. 115 */ 116 #define RSYSCALL(x) \ 117 PSEUDO(x,x) 118 119 120 /* 121 * Do a renamed or pseudo syscall (e.g., _exit()), where the entrypoint 122 * and syscall name are not the same. 123 */ 124 #define PSEUDO_NOERROR(x,y) \ 125 PIC_SYSTRAP(x,y); \ 126 j ra; \ 127 END(x) 128 129 #define PSEUDO(x,y) \ 130 PIC_SYSTRAP(x,y); \ 131 bne a3,zero,err; j ra; \ 132 err: PIC_CALL(cerror,t9); \ 133 END(x) 134 135