SYS.h revision 17706
1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)SYS.h 5.5 (Berkeley) 5/7/91 37 * 38 * $Id: SYS.h,v 1.4 1996/05/05 07:56:03 peter Exp $ 39 */ 40 41#include <sys/syscall.h> 42#include "DEFS.h" 43 44#ifdef PIC 45#define PIC_PROLOGUE \ 46 pushl %ebx; \ 47 call 1f; \ 481: \ 49 popl %ebx; \ 50 addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx 51#define PIC_EPILOGUE \ 52 popl %ebx 53#define PIC_PLT(x) x@PLT 54#define PIC_GOT(x) x@GOT(%ebx) 55#define PIC_GOTOFF(x) x@GOTOFF(%ebx) 56#else 57#define PIC_PROLOGUE 58#define PIC_EPILOGUE 59#define PIC_PLT(x) x 60#define PIC_GOT(x) x 61#define PIC_GOTOFF(x) x 62#endif 63 64#define SYSCALL(x) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); ENTRY(x); lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b 65#define RSYSCALL(x) SYSCALL(x); ret 66 67#define PSEUDO(x,y) ENTRY(x); lea __CONCAT(SYS_,y), %eax; KERNCALL; ret 68#define CALL(x,y) call CNAME(y); addl $4*x,%esp 69/* gas fucks up offset -- although we don't currently need it, do for BCS */ 70#define LCALL(x,y) .byte 0x9a ; .long y; .word x 71 72/* 73 * Design note: 74 * 75 * The macros PSYSCALL() and PRSYSCALL() are intended for use where a 76 * syscall needs to be renamed in the threaded library. When building 77 * a normal library, they default to the traditional SYSCALL() and 78 * RSYSCALL(). This avoids the need to #ifdef _THREAD_SAFE everywhere 79 * that the renamed function needs to be called. 80 */ 81#ifdef _THREAD_SAFE /* in case */ 82/* 83 * For the thread_safe versions, we prepend _thread_sys_ to the function 84 * name so that the 'C' wrapper can go around the real name. 85 */ 86#define PSYSCALL(x) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); ENTRY(_thread_sys_/**/x); lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b 87#define PRSYSCALL(x) PSYSCALL(x); ret 88#define PPSEUDO(x,y) ENTRY(_thread_sys_/**/x); lea __CONCAT(SYS_,y), %eax; KERNCALL; ret 89#else 90/* 91 * The non-threaded library defaults to traditional syscalls where 92 * the function name matches the syscall name. 93 */ 94#define PSYSCALL(x) SYSCALL(x) 95#define PRSYSCALL(x) RSYSCALL(x) 96#define PPSEUDO(x,y) PSEUDO(x,y) 97#endif 98 99#ifdef __ELF__ 100#define KERNCALL int $0x80 /* Faster */ 101#else 102#define KERNCALL LCALL(7,0) /* The old way */ 103#endif 104 105#define ASMSTR .asciz 106