1 /* $NetBSD: asm.h,v 1.17 2002/01/14 16:37:36 eeh Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Allen Briggs 5 * All rights reserved. 6 * 7 * Gleaned from locore.s and sun3 asm.h which had the following copyrights: 8 * locore.s: 9 * Copyright (c) 1988 University of Utah. 10 * Copyright (c) 1982, 1990 The Regents of the University of California. 11 * sun3/include/asm.h: 12 * Copyright (c) 1993 Adam Glass 13 * Copyright (c) 1990 The Regents of the University of California. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. All advertising materials mentioning features or use of this software 24 * must display the following acknowledgement: 25 * This product includes software developed by the University of 26 * California, Berkeley and its contributors. 27 * 4. Neither the name of the University nor the names of its contributors 28 * may be used to endorse or promote products derived from this software 29 * without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 41 * SUCH DAMAGE. 42 */ 43 44 #ifndef _ASM_H_ 45 #define _ASM_H_ 46 47 #ifndef _LOCORE 48 #define _LOCORE 49 #endif 50 #include <machine/frame.h> 51 52 #ifdef __arch64__ 53 #ifndef __ELF__ 54 #define __ELF__ 55 #endif 56 #endif 57 58 /* Pull in CCFSZ, CC64FSZ, and BIAS from frame.h */ 59 #ifndef _LOCORE 60 #define _LOCORE 61 #endif 62 #include <machine/frame.h> 63 64 #ifdef __ELF__ 65 #define _C_LABEL(name) name 66 #else 67 #ifdef __STDC__ 68 #define _C_LABEL(name) _ ## name 69 #else 70 #define _C_LABEL(name) _/**/name 71 #endif 72 #endif 73 #define _ASM_LABEL(name) name 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. 80 * 81 * We can use two code sequences. We can read the %pc or use the call 82 * instruction that saves the pc in %o7. Call requires the branch unit and 83 * IEU1, and clobbers %o7 which needs to be restored. This instruction 84 * sequence takes about 4 cycles due to instruction interdependence. Reading 85 * the pc takes 4 cycles to dispatch and is always dispatched alone. That 86 * sequence takes 7 cycles. 87 */ 88 #define PIC_PROLOGUE(dest,tmp) \ 89 mov %o7, tmp; \ 90 sethi %hi(_GLOBAL_OFFSET_TABLE_-4),dest; \ 91 call 0f; \ 92 or dest,%lo(_GLOBAL_OFFSET_TABLE_+4),dest; \ 93 0: \ 94 add dest,%o7,dest; \ 95 mov tmp, %o7 96 97 /* 98 * PICCY_SET() does the equivalent of a `set var, %dest' instruction in 99 * a PIC-like way, but without involving the Global Offset Table. This 100 * only works for VARs defined in the same file *and* in the text segment. 101 */ 102 #define PICCY_SET(var,dest,tmp) \ 103 3: rd %pc, tmp; add tmp,(var-3b),dest 104 #else 105 #define PIC_PROLOGUE(dest,tmp) 106 #define PICCY_OFFSET(var,dest,tmp) 107 #endif 108 109 #define FTYPE(x) .type x,@function 110 #define OTYPE(x) .type x,@object 111 112 #define _ENTRY(name) \ 113 .align 4; .globl name; .proc 1; FTYPE(name); name: 114 115 #ifdef GPROF 116 /* see _MCOUNT_ENTRY in profile.h */ 117 #ifdef __ELF__ 118 #define _PROF_PROLOGUE \ 119 .data; .align 8; 1: .uaword 0; .uaword 0; \ 120 .text; save %sp,-CC64FSZ,%sp; sethi %hi(1b),%o0; call _mcount; \ 121 or %o0,%lo(1b),%o0; restore 122 #else 123 #define _PROF_PROLOGUE \ 124 .data; .align 8; 1: .uaword 0; .uaword 0; \ 125 .text; save %sp,-CC64FSZ,%sp; sethi %hi(1b),%o0; call mcount; \ 126 or %o0,%lo(1b),%o0; restore 127 #endif 128 #else 129 #define _PROF_PROLOGUE 130 #endif 131 132 #define ENTRY(name) _ENTRY(_C_LABEL(name)); _PROF_PROLOGUE 133 #define ASENTRY(name) _ENTRY(_ASM_LABEL(name)); _PROF_PROLOGUE 134 #define FUNC(name) ASENTRY(name) 135 #define RODATA(name) .align 4; .text; .globl _C_LABEL(name); \ 136 OTYPE(_C_LABEL(name)); _C_LABEL(name): 137 138 139 #define ASMSTR .asciz 140 141 #define RCSID(name) .asciz name 142 143 #ifdef __ELF__ 144 #define WEAK_ALIAS(alias,sym) \ 145 .weak alias; \ 146 alias = sym 147 #endif 148 149 /* 150 * WARN_REFERENCES: create a warning if the specified symbol is referenced. 151 */ 152 #ifdef __ELF__ 153 #ifdef __STDC__ 154 #define WARN_REFERENCES(_sym,_msg) \ 155 .section .gnu.warning. ## _sym ; .ascii _msg ; .text 156 #else 157 #define WARN_REFERENCES(_sym,_msg) \ 158 .section .gnu.warning./**/_sym ; .ascii _msg ; .text 159 #endif /* __STDC__ */ 160 #else 161 #ifdef __STDC__ 162 #define __STRING(x) #x 163 #define WARN_REFERENCES(sym,msg) \ 164 .stabs msg ## ,30,0,0,0 ; \ 165 .stabs __STRING(_ ## sym) ## ,1,0,0,0 166 #else 167 #define __STRING(x) "x" 168 #define WARN_REFERENCES(sym,msg) \ 169 .stabs msg,30,0,0,0 ; \ 170 .stabs __STRING(_/**/sym),1,0,0,0 171 #endif /* __STDC__ */ 172 #endif /* __ELF__ */ 173 174 #endif /* _ASM_H_ */ 175