1 /* $NetBSD: asm.h,v 1.15 2002/09/17 15:28:28 uwe 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 /* Pull in CCFSZ, CC64FSZ, and BIAS from frame.h */ 48 #ifndef _LOCORE 49 #define _LOCORE 50 #endif 51 #include <machine/frame.h> 52 53 #ifdef __ELF__ 54 #define _C_LABEL(name) name 55 #else 56 #ifdef __STDC__ 57 #define _C_LABEL(name) _ ## name 58 #else 59 #define _C_LABEL(name) _/**/name 60 #endif 61 #endif 62 #define _ASM_LABEL(name) name 63 64 #ifdef PIC 65 /* 66 * PIC_PROLOGUE() is akin to the compiler generated function prologue for 67 * PIC code. It leaves the address of the Global Offset Table in DEST, 68 * clobbering register TMP in the process. 69 * 70 * We can use two code sequences. We can read the %pc or use the call 71 * instruction that saves the pc in %o7. Call requires the branch unit and 72 * IEU1, and clobbers %o7 which needs to be restored. This instruction 73 * sequence takes about 4 cycles due to instruction interdependence. Reading 74 * the pc takes 4 cycles to dispatch and is always dispatched alone. That 75 * sequence takes 7 cycles. 76 */ 77 #ifdef __arch64__ 78 #define PIC_PROLOGUE(dest,tmp) \ 79 mov %o7, tmp; \ 80 sethi %hi(_GLOBAL_OFFSET_TABLE_-4),dest; \ 81 call 0f; \ 82 or dest,%lo(_GLOBAL_OFFSET_TABLE_+4),dest; \ 83 0: \ 84 add dest,%o7,dest; \ 85 mov tmp, %o7 86 #else 87 #define PIC_PROLOGUE(dest,tmp) \ 88 mov %o7,tmp; 3: call 4f; nop; 4: \ 89 sethi %hi(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \ 90 or dest,%lo(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \ 91 add dest,%o7,dest; mov tmp,%o7 92 #endif 93 94 /* 95 * PICCY_SET() does the equivalent of a `set var, %dest' instruction in 96 * a PIC-like way, but without involving the Global Offset Table. This 97 * only works for VARs defined in the same file *and* in the text segment. 98 */ 99 #ifdef __arch64__ 100 #define PICCY_SET(var,dest,tmp) \ 101 3: rd %pc, tmp; add tmp,(var-3b),dest 102 #else 103 #define PICCY_SET(var,dest,tmp) \ 104 mov %o7,tmp; 3: call 4f; nop; 4: \ 105 add %o7,(var-3b),dest; mov tmp,%o7 106 #endif 107 #else 108 #define PIC_PROLOGUE(dest,tmp) 109 #define PICCY_OFFSET(var,dest,tmp) 110 #endif 111 112 #define FTYPE(x) .type x,@function 113 #define OTYPE(x) .type x,@object 114 115 #define _ENTRY(name) \ 116 .align 4; .globl name; .proc 1; FTYPE(name); name: 117 118 #ifdef GPROF 119 /* see _MCOUNT_ENTRY in profile.h */ 120 #ifdef __ELF__ 121 #ifdef __arch64__ 122 #define _PROF_PROLOGUE \ 123 .data; .align 8; 1: .uaword 0; .uaword 0; \ 124 .text; save %sp,-CC64FSZ,%sp; sethi %hi(1b),%o0; call _mcount; \ 125 or %o0,%lo(1b),%o0; restore 126 #else 127 #define _PROF_PROLOGUE \ 128 .data; .align 4; 1: .long 0; \ 129 .text; save %sp,-96,%sp; sethi %hi(1b),%o0; call _mcount; \ 130 or %o0,%lo(1b),%o0; restore 131 #endif 132 #else 133 #ifdef __arch64__ 134 #define _PROF_PROLOGUE \ 135 .data; .align 8; 1: .uaword 0; .uaword 0; \ 136 .text; save %sp,-CC64FSZ,%sp; sethi %hi(1b),%o0; call mcount; \ 137 or %o0,%lo(1b),%o0; restore 138 #else 139 #define _PROF_PROLOGUE \ 140 .data; .align 4; 1: .long 0; \ 141 .text; save %sp,-96,%sp; sethi %hi(1b),%o0; call mcount; \ 142 or %o0,%lo(1b),%o0; restore 143 #endif 144 #endif 145 #else 146 #define _PROF_PROLOGUE 147 #endif 148 149 #define ENTRY(name) _ENTRY(_C_LABEL(name)); _PROF_PROLOGUE 150 #define ENTRY_NOPROFILE(name) _ENTRY(_C_LABEL(name)) 151 #define ASENTRY(name) _ENTRY(_ASM_LABEL(name)); _PROF_PROLOGUE 152 #define FUNC(name) ASENTRY(name) 153 #define RODATA(name) .align 4; .text; .globl _C_LABEL(name); \ 154 OTYPE(_C_LABEL(name)); _C_LABEL(name): 155 156 157 #define ASMSTR .asciz 158 159 #ifdef __ELF__ 160 #define RCSID(name) .pushsection ".ident"; .asciz name; .popsection 161 #else 162 #define RCSID(name) .asciz name 163 #endif 164 165 #ifdef NO_KERNEL_RCSIDS 166 #define __KERNEL_RCSID(_n, _s) /* nothing */ 167 #else 168 #define __KERNEL_RCSID(_n, _s) RCSID(_s) 169 #endif 170 171 #ifdef __ELF__ 172 #define WEAK_ALIAS(alias,sym) \ 173 .weak alias; \ 174 alias = sym 175 #endif 176 177 /* 178 * WARN_REFERENCES: create a warning if the specified symbol is referenced. 179 */ 180 #ifdef __ELF__ 181 #ifdef __STDC__ 182 #define WARN_REFERENCES(_sym,_msg) \ 183 .section .gnu.warning. ## _sym ; .ascii _msg ; .text 184 #else 185 #define WARN_REFERENCES(_sym,_msg) \ 186 .section .gnu.warning./**/_sym ; .ascii _msg ; .text 187 #endif /* __STDC__ */ 188 #else 189 #ifdef __STDC__ 190 #define __STRING(x) #x 191 #define WARN_REFERENCES(sym,msg) \ 192 .stabs msg ## ,30,0,0,0 ; \ 193 .stabs __STRING(_ ## sym) ## ,1,0,0,0 194 #else 195 #define __STRING(x) "x" 196 #define WARN_REFERENCES(sym,msg) \ 197 .stabs msg,30,0,0,0 ; \ 198 .stabs __STRING(_/**/sym),1,0,0,0 199 #endif /* __STDC__ */ 200 #endif /* __ELF__ */ 201 202 #endif /* _ASM_H_ */ 203