asm.h revision 93256
1/* $FreeBSD: head/sys/ia64/include/asm.h 93256 2002-03-27 02:20:09Z marcel $ */ 2/* From: NetBSD: asm.h,v 1.18 1997/11/03 04:22:06 ross Exp */ 3 4/* 5 * Copyright (c) 1991,1990,1989,1994,1995,1996 Carnegie Mellon University 6 * All Rights Reserved. 7 * 8 * Permission to use, copy, modify and distribute this software and its 9 * documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie Mellon 26 * the rights to redistribute these changes. 27 */ 28 29/* 30 * Assembly coding style 31 * 32 * This file contains macros and register defines to 33 * aid in writing more readable assembly code. 34 * Some rules to make assembly code understandable by 35 * a debugger are also noted. 36 * 37 * The document 38 * 39 * "ALPHA Calling Standard", DEC 27-Apr-90 40 * 41 * defines (a superset of) the rules and conventions 42 * we use. While we make no promise of adhering to 43 * such standard and its evolution (esp where we 44 * can get faster code paths) it is certainly intended 45 * that we be interoperable with such standard. 46 * 47 * In this sense, this file is a proper part of the 48 * definition of the (software) Alpha architecture. 49 */ 50 51/* 52 * Macro to make a local label name. 53 */ 54#define LLABEL(name,num) L ## name ## num 55 56/* 57 * MCOUNT 58 */ 59 60#if !defined(GPROF) && !defined(PROF) 61#define MCOUNT /* nothing */ 62#else 63#define MCOUNT \ 64 br.call.sptk.many b7=_mcount 65#endif 66 67/* 68 * ENTRY 69 * Declare a global leaf function. 70 * A leaf function does not call other functions. 71 */ 72#define ENTRY(_name_, _n_args_) \ 73 .global _name_; \ 74 .align 16; \ 75 .proc _name_; \ 76_name_:; \ 77 .regstk _n_args_, 0, 0, 0 \ 78 MCOUNT 79 80#define ENTRY_NOPROFILE(_name_, _n_args_) \ 81 .global _name_; \ 82 .align 16; \ 83 .proc _name_; \ 84_name_:; \ 85 .regstk _n_args_, 0, 0, 0 86 87/* 88 * STATIC_ENTRY 89 * Declare a local leaf function. 90 */ 91#define STATIC_ENTRY(_name_, _n_args_) \ 92 .align 16; \ 93 .proc _name_; \ 94_name_:; \ 95 .regstk _n_args_, 0, 0, 0 \ 96 MCOUNT 97/* 98 * XENTRY 99 * Global alias for a leaf function, or alternate entry point 100 */ 101#define XENTRY(_name_) \ 102 .globl _name_; \ 103_name_: 104 105/* 106 * STATIC_XENTRY 107 * Local alias for a leaf function, or alternate entry point 108 */ 109#define STATIC_XENTRY(_name_) \ 110_name_: 111 112 113/* 114 * END 115 * Function delimiter 116 */ 117#define END(_name_) \ 118 .endp _name_ 119 120 121/* 122 * EXPORT 123 * Export a symbol 124 */ 125#define EXPORT(_name_) \ 126 .global _name_; \ 127_name_: 128 129 130/* 131 * IMPORT 132 * Make an external name visible, typecheck the size 133 */ 134#define IMPORT(_name_, _size_) \ 135 /* .extern _name_,_size_ */ 136 137 138/* 139 * ABS 140 * Define an absolute symbol 141 */ 142#define ABS(_name_, _value_) \ 143 .globl _name_; \ 144_name_ = _value_ 145 146 147/* 148 * BSS 149 * Allocate un-initialized space for a global symbol 150 */ 151#define BSS(_name_,_numbytes_) \ 152 .comm _name_,_numbytes_ 153 154 155/* 156 * MSG 157 * Allocate space for a message (a read-only ascii string) 158 */ 159#define ASCIZ .asciz 160#define MSG(msg,reg,label) \ 161 addl reg,@ltoff(label),gp;; \ 162 ld8 reg=[reg];; \ 163 .data; \ 164label: ASCIZ msg; \ 165 .text; 166 167/* 168 * System call glue. 169 */ 170#define SYSCALLNUM(name) \ 171 SYS_ ## name 172 173#define CALLSYS_NOERROR(name) \ 174 mov r15=SYSCALLNUM(name); \ 175 break 0x100000 ;; 176 177/* 178 * WEAK_ALIAS: create a weak alias (ELF only). 179 */ 180#ifdef __ELF__ 181#define WEAK_ALIAS(alias,sym) \ 182 .weak alias; \ 183 alias = sym 184#endif 185 186/* 187 * Kernel RCS ID tag and copyright macros 188 */ 189 190#ifdef _KERNEL 191 192#ifdef __ELF__ 193#define __KERNEL_SECTIONSTRING(_sec, _str) \ 194 .section _sec ; .asciz _str ; .text 195#else /* __ELF__ */ 196#define __KERNEL_SECTIONSTRING(_sec, _str) \ 197 .data ; .asciz _str ; .align 3 ; .text 198#endif /* __ELF__ */ 199 200#define __KERNEL_RCSID(_n, _s) __KERNEL_SECTIONSTRING(.ident, _s) 201#define __KERNEL_COPYRIGHT(_n, _s) __KERNEL_SECTIONSTRING(.copyright, _s) 202 203#ifdef NO_KERNEL_RCSIDS 204#undef __KERNEL_RCSID 205#define __KERNEL_RCSID(_n, _s) /* nothing */ 206#endif 207 208#endif /* _KERNEL */ 209 210#if !defined(lint) && !defined(STRIP_FBSDID) 211#define __FBSDID(s) .ident s 212#else 213#define __FBSDID(s) /* nothing */ 214#endif /* not lint and not STRIP_FBSDID */ 215