1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)DEFS.h 5.1 (Berkeley) 4/23/90 35 * $FreeBSD$ 36 */ 37 38 #ifndef _MACHINE_ASM_H_ 39 #define _MACHINE_ASM_H_ 40 41 #include <sys/cdefs.h> 42 43 #ifdef PIC 44 #define PIC_PROLOGUE \ 45 pushl %ebx; \ 46 call 1f; \ 47 1: \ 48 popl %ebx; \ 49 addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx 50 #define PIC_EPILOGUE \ 51 popl %ebx 52 #define PIC_PLT(x) x@PLT 53 #define PIC_GOT(x) x@GOT(%ebx) 54 #define PIC_GOTOFF(x) x@GOTOFF(%ebx) 55 #else 56 #define PIC_PROLOGUE 57 #define PIC_EPILOGUE 58 #define PIC_PLT(x) x 59 #define PIC_GOTOFF(x) x 60 #endif 61 62 /* 63 * CNAME and HIDENAME manage the relationship between symbol names in C 64 * and the equivalent assembly language names. CNAME is given a name as 65 * it would be used in a C program. It expands to the equivalent assembly 66 * language name. HIDENAME is given an assembly-language name, and expands 67 * to a possibly-modified form that will be invisible to C programs. 68 */ 69 #define CNAME(csym) csym 70 #define HIDENAME(asmsym) .asmsym 71 72 /* XXX should use .p2align 4,0x90 for -m486. */ 73 #define _START_ENTRY .text; .p2align 2,0x90 74 75 #define _ENTRY(x) _START_ENTRY; \ 76 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): \ 77 .cfi_startproc 78 #define END(x) .cfi_endproc; .size x, . - x 79 80 #ifdef PROF 81 #define ALTENTRY(x) _ENTRY(x); \ 82 pushl %ebp; \ 83 .cfi_def_cfa_offset 8; \ 84 .cfi_offset %ebp, -8; \ 85 movl %esp,%ebp; \ 86 call PIC_PLT(HIDENAME(mcount)); \ 87 popl %ebp; \ 88 .cfi_restore %ebp; \ 89 .cfi_def_cfa_offset 4; \ 90 jmp 9f 91 #define ENTRY(x) _ENTRY(x); \ 92 pushl %ebp; \ 93 .cfi_def_cfa_offset 8; \ 94 .cfi_offset %ebp, -8; \ 95 movl %esp,%ebp; \ 96 call PIC_PLT(HIDENAME(mcount)); \ 97 popl %ebp; \ 98 .cfi_restore %ebp; \ 99 .cfi_def_cfa_offset 4; \ 100 9: 101 #else 102 #define ALTENTRY(x) _ENTRY(x) 103 #define ENTRY(x) _ENTRY(x) 104 #endif 105 106 /* 107 * WEAK_REFERENCE(): create a weak reference alias from sym. 108 * The macro is not a general asm macro that takes arbitrary names, 109 * but one that takes only C names. It does the non-null name 110 * translation inside the macro. 111 */ 112 113 #define WEAK_REFERENCE(sym, alias) \ 114 .weak CNAME(alias); \ 115 .equ CNAME(alias),CNAME(sym) 116 117 /* 118 * STRONG_ALIAS: create a strong alias. 119 */ 120 #define STRONG_ALIAS(alias,sym) \ 121 .globl alias; \ 122 alias = sym 123 124 #define RCSID(x) .text; .asciz x 125 126 #undef __FBSDID 127 #if !defined(STRIP_FBSDID) 128 #define __FBSDID(s) .ident s 129 #else 130 #define __FBSDID(s) /* nothing */ 131 #endif /* not STRIP_FBSDID */ 132 133 #endif /* !_MACHINE_ASM_H_ */ 134