1 /** $MirOS: src/sys/arch/sparc/include/asm.h,v 1.9 2014/03/23 20:36:10 tg Exp $ */ 2 /* $OpenBSD: asm.h,v 1.4 2003/06/04 22:08:17 deraadt Exp $ */ 3 /* $NetBSD: asm.h,v 1.5 1997/07/16 15:16:43 christos Exp $ */ 4 5 /* 6 * Copyright (c) 1994 Allen Briggs 7 * All rights reserved. 8 * 9 * Gleaned from locore.s and sun3 asm.h which had the following copyrights: 10 * locore.s: 11 * Copyright (c) 1988 University of Utah. 12 * Copyright (c) 1982, 1990 The Regents of the University of California. 13 * sun3/include/asm.h: 14 * Copyright (c) 1993 Adam Glass 15 * Copyright (c) 1990 The Regents of the University of California. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 3. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 */ 41 42 #ifndef _SPARC_ASM_H_ 43 #define _SPARC_ASM_H_ 44 45 #ifdef __ELF__ 46 #define _C_LABEL(name) name 47 #else 48 #ifdef __STDC__ 49 #define _C_LABEL(name) _ ## name 50 #else 51 #define _C_LABEL(name) _/**/name 52 #endif 53 #endif 54 #define _ASM_LABEL(name) name 55 56 /* 57 * WEAK_ALIAS: create a weak alias (ELF only) 58 */ 59 #ifdef __ELF__ 60 #define WEAK_ALIAS(alias,sym) \ 61 .weak alias; \ 62 alias = sym 63 #endif 64 65 /* 66 * WARN_REFERENCES: create a warning if the specified symbol is referenced 67 * (ELF only). 68 */ 69 #ifdef __ELF__ 70 #define WARN_REFERENCES(_sym,_msg) \ 71 .section .gnu.warning. ## _sym ; .ascii "REF! " _msg ; .previous 72 #endif /* __ELF__ */ 73 74 75 #ifdef PIC 76 /* 77 * PIC_PROLOGUE() is akin to the compiler generated function prologue for 78 * PIC code. It leaves the address of the Global Offset Table in DEST, 79 * clobbering register TMP in the process. Using the temporary enables us 80 * to work without a stack frame (doing so requires saving %o7) . 81 */ 82 #define PIC_PROLOGUE(dest,tmp) \ 83 mov %o7,tmp; 3: call 4f; nop; 4: \ 84 sethi %hi(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \ 85 or dest,%lo(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \ 86 add dest,%o7,dest; mov tmp,%o7 87 88 /* 89 * PICCY_SET() does the equivalent of a `set var, %dest' instruction in 90 * a PIC-like way, but without involving the Global Offset Table. This 91 * only works for VARs defined in the same file *and* in the text segment. 92 */ 93 #define PICCY_SET(var,dest,tmp) \ 94 mov %o7,tmp; 3: call 4f; nop; 4: \ 95 add %o7,(var-3b),dest; mov tmp,%o7 96 #else 97 #define PIC_PROLOGUE(dest,tmp) 98 #define PICCY_OFFSET(var,dest,tmp) 99 #endif 100 101 /* let kernels and others override entrypoint alignment */ 102 #ifndef _ALIGN_TEXT 103 #define _ALIGN_TEXT .p2align 2 104 #endif 105 106 #define FTYPE(x) .type x,@function 107 #define OTYPE(x) .type x,@object 108 109 #define _ENTRY(name) \ 110 .text; _ALIGN_TEXT; .globl name; .proc 1; FTYPE(name); name: 111 112 /* no profiling */ 113 #define _PROF_PROLOGUE 114 115 #define ENTRY(name) _ENTRY(_C_LABEL(name)); _PROF_PROLOGUE 116 #define NENTRY(name) _ENTRY(_C_LABEL(name)) 117 #define ASENTRY(name) _ENTRY(_ASM_LABEL(name)); _PROF_PROLOGUE 118 #define FUNC(name) ASENTRY(name) 119 120 #define ALTENTRY(name) \ 121 .globl _C_LABEL(name); FTYPE(_C_LABEL(name)); _C_LABEL(name): 122 #define DENTRY(name) \ 123 .globl _C_LABEL(name); OTYPE(_C_LABEL(name)); _C_LABEL(name): 124 125 #define ASMSTR .asciz 126 127 #define RCSID(x) .section .comment; \ 128 .ascii "@(""#)rcsid: "; \ 129 .asciz x; \ 130 .previous 131 132 #endif /* _SPARC_ASM_H_ */ 133