/*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Ralph Campbell. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $OpenBSD: SYS.h,v 1.14 2023/12/11 22:24:16 kettenis Exp $ */ #include <sys/syscall.h> #include <machine/asm.h> /* * We define a hidden alias with the prefix "_libc_" for each global symbol * that may be used internally. By referencing _libc_x instead of x, other * parts of libc prevent overriding by the application and avoid unnecessary * relocations. */ #define _HIDDEN(x) _libc_##x #define _HIDDEN_ALIAS(x,y) \ STRONG_ALIAS(_HIDDEN(x),y); \ .hidden _HIDDEN(x) #define _HIDDEN_FALIAS(x,y) \ _HIDDEN_ALIAS(x,y); \ .type _HIDDEN(x),@function /* * For functions implemented in ASM that aren't syscalls. * END_STRONG(x) Like DEF_STRONG() in C; for standard/reserved C names * END_WEAK(x) Like DEF_WEAK() in C; for non-ISO C names */ #define END_STRONG(x) END(x); \ _HIDDEN_FALIAS(x,x); \ .size _HIDDEN(x), . - _HIDDEN(x) #define END_WEAK(x) END_STRONG(x); .weak x #define CERROR __cerror .hidden CERROR # define __ENTRY(p,x) ENTRY(p ## x) # define __DO_SYSCALL(x) \ li v0,SYS_ ## x; \ 97: syscall; \ PINSYSCALL(SYS_ ## x, 97b) \ # define __LEAF2(p,x,sz) LEAF(p ## x, sz) \ WEAK_ALIAS(x, p ## x); # define __END2_HIDDEN(p,x) END(p ## x); \ _HIDDEN_FALIAS(x, p ## x); \ .size _HIDDEN(x), . - _HIDDEN(x) # define __END2(p,x) __END2_HIDDEN(p,x); \ .size x, . - x #define __PSEUDO_NOERROR(p,x,y) \ __LEAF2(p,x, 0); \ __DO_SYSCALL(y); \ j ra; \ __END2(p,x) #define __PSEUDO(p,x,y) \ __LEAF2(p,x,32); \ PTR_SUBU sp,32; \ SETUP_GP64(16,_HIDDEN(x)); \ __DO_SYSCALL(y); \ bne a3,zero,1f; \ RESTORE_GP64; \ PTR_ADDU sp,32; \ j ra; \ 1: LA t9,CERROR; \ RESTORE_GP64; \ PTR_ADDU sp,32; \ jr t9; \ __END2(p,x) #define __PSEUDO_HIDDEN(p,x,y) \ LEAF(p ## x,32); \ PTR_SUBU sp,32; \ SETUP_GP64(16,_HIDDEN(x)); \ __DO_SYSCALL(y); \ bne a3,zero,1f; \ RESTORE_GP64; \ PTR_ADDU sp,32; \ j ra; \ 1: LA t9,CERROR; \ RESTORE_GP64; \ PTR_ADDU sp,32; \ jr t9; \ __END2_HIDDEN(p,x) #define RSYSCALL(x) __PSEUDO(_thread_sys_,x,x) #define RSYSCALL_HIDDEN(x) __PSEUDO_HIDDEN(_thread_sys_,x,x) #define PSEUDO(x,y) __PSEUDO(_thread_sys_,x,y) #define PSEUDO_NOERROR(x,y) __PSEUDO_NOERROR(_thread_sys_,x,y) #define SYSLEAF(x, sz) __LEAF2(_thread_sys_,x, sz) #define SYSLEAF_HIDDEN(x, sz) LEAF(_thread_sys_ ## x, sz) #define SYSCALL_END(x) __END2(_thread_sys_,x) #define SYSCALL_END_HIDDEN(x) __END2_HIDDEN(_thread_sys_,x) #define PINSYSCALL(sysno, label) \ .pushsection .openbsd.syscalls,"",@progbits; \ .p2align 2; \ .long label; \ .long sysno; \ .popsection;
