1 /* $OpenBSD: SYS.h,v 1.6 2023年12月10日 16:45:52 deraadt Exp $ */ 2 /*- 3 * Copyright (c) 1994 4 * Andrew Cagney. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Ralph Campbell. 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 * from: @(#)SYS.h 8.1 (Berkeley) 6/4/93 38 */ 39 40#include "DEFS.h" 41#include <sys/syscall.h> 42 43 /* r0 will be a non zero errno if there was an error, while r3/r4 will 44 contain the return value */ 45 46#include "machine/asm.h" 47 48 49 /* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */ 50#define TCB_OFFSET_ERRNO (-20) 51 /* from <powerpc64/tcb.h>: TCB address == %r13 - TCB_OFFSET */ 52#define TCB_OFFSET 0x7008 53 54 /* offset of errno from %r13 */ 55#define R13_OFFSET_ERRNO (-TCB_OFFSET + TCB_OFFSET_ERRNO) 56 57#define SYSENTRY(x) .weak x; \ 58 x = _thread_sys_ ## x; \ 59 ENTRY(_thread_sys_ ## x) 60#define SYSENTRY_HIDDEN(x) ENTRY(_thread_sys_ ## x) 61#define __END_HIDDEN(p,x) END(p##x); \ 62 _HIDDEN_FALIAS(x,p##x); \ 63 END(_HIDDEN(x)) 64#define __END(p,x) __END_HIDDEN(p,x); END(x) 65 66#define ALIAS(x,y) WEAK_ALIAS(y, x ## y); 67 68#define PSEUDO_NOERROR(x,y) ALIAS(_thread_sys_,x) \ 69 ENTRY(_thread_sys_ ## x) \ 70 RETGUARD_SETUP(_thread_sys_ ## x, %r11); \ 71 li %r0, SYS_ ## y ; \ 72 97: sc ; \ 73 PINSYSCALL(SYS_ ## y, 97b); \ 74 RETGUARD_CHECK(_thread_sys_ ## x, %r11); \ 75 blr; \ 76 __END(_thread_sys_,x) 77 78#define PSEUDO_HIDDEN(x,y) ENTRY(_thread_sys_ ## x) \ 79 RETGUARD_SETUP(_thread_sys_ ## x, %r11); \ 80 li %r0, SYS_ ## y ; \ 81 97: sc ; \ 82 PINSYSCALL(SYS_ ## y, 97b); \ 83 cmpwi %r0, 0 ; \ 84 beq .L_ret ; \ 85 stw %r0, R13_OFFSET_ERRNO(%r13); \ 86 li %r3, -1; \ 87 .L_ret: \ 88 RETGUARD_CHECK(_thread_sys_ ## x, %r11); \ 89 blr; \ 90 __END_HIDDEN(_thread_sys_,x) 91 92#define PSEUDO(x,y) ALIAS(_thread_sys_,x) \ 93 PSEUDO_HIDDEN(x,y); \ 94 END(x) 95 96#define RSYSCALL(x) PSEUDO(x,x) 97#define RSYSCALL_HIDDEN(x) PSEUDO_HIDDEN(x,x) 98#define SYSCALL_END_HIDDEN(x) __END_HIDDEN(_thread_sys_,x) 99#define SYSCALL_END(x) __END(_thread_sys_,x) 100 101