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 35 #ifndef _MACHINE_ASM_H_ 36 #define _MACHINE_ASM_H_ 37 38 #include <sys/cdefs.h> 39 40 #ifdef PIC 41 #define PIC_PROLOGUE \ 42 pushl %ebx; \ 43 call 1f; \ 44 1: \ 45 popl %ebx; \ 46 addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx 47 #define PIC_EPILOGUE \ 48 popl %ebx 49 #define PIC_PLT(x) x@PLT 50 #define PIC_GOT(x) x@GOT(%ebx) 51 #define PIC_GOTOFF(x) x@GOTOFF(%ebx) 52 #else 53 #define PIC_PROLOGUE 54 #define PIC_EPILOGUE 55 #define PIC_PLT(x) x 56 #define PIC_GOTOFF(x) x 57 #endif 58 59 /* 60 * CNAME and HIDENAME manage the relationship between symbol names in C 61 * and the equivalent assembly language names. CNAME is given a name as 62 * it would be used in a C program. It expands to the equivalent assembly 63 * language name. HIDENAME is given an assembly-language name, and expands 64 * to a possibly-modified form that will be invisible to C programs. 65 */ 66 #define CNAME(csym) csym 67 #define HIDENAME(asmsym) .asmsym 68 69 /* XXX should use .p2align 4,0x90 for -m486. */ 70 #define _START_ENTRY .text; .p2align 2,0x90 71 72 #define _ENTRY(x) _START_ENTRY; \ 73 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): \ 74 .cfi_startproc 75 #define END(x) .cfi_endproc; .size x, . - x 76 77 #ifdef PROF 78 #define ALTENTRY(x) _ENTRY(x); \ 79 pushl %ebp; \ 80 .cfi_def_cfa_offset 8; \ 81 .cfi_offset %ebp, -8; \ 82 movl %esp,%ebp; \ 83 call PIC_PLT(HIDENAME(mcount)); \ 84 popl %ebp; \ 85 .cfi_restore %ebp; \ 86 .cfi_def_cfa_offset 4; \ 87 jmp 9f 88 #define ENTRY(x) _ENTRY(x); \ 89 pushl %ebp; \ 90 .cfi_def_cfa_offset 8; \ 91 .cfi_offset %ebp, -8; \ 92 movl %esp,%ebp; \ 93 call PIC_PLT(HIDENAME(mcount)); \ 94 popl %ebp; \ 95 .cfi_restore %ebp; \ 96 .cfi_def_cfa_offset 4; \ 97 9: 98 #else 99 #define ALTENTRY(x) _ENTRY(x) 100 #define ENTRY(x) _ENTRY(x) 101 #endif 102 103 /* 104 * WEAK_REFERENCE(): create a weak reference alias from sym. 105 * The macro is not a general asm macro that takes arbitrary names, 106 * but one that takes only C names. It does the non-null name 107 * translation inside the macro. 108 */ 109 110 #define WEAK_REFERENCE(sym, alias) \ 111 .weak CNAME(alias); \ 112 .equ CNAME(alias),CNAME(sym) 113 114 /* 115 * STRONG_ALIAS: create a strong alias. 116 */ 117 #define STRONG_ALIAS(alias,sym) \ 118 .globl alias; \ 119 alias = sym 120 121 #define RCSID(x) .text; .asciz x 122 123 #undef __FBSDID 124 #if !defined(STRIP_FBSDID) 125 #define __FBSDID(s) .ident s 126 #else 127 #define __FBSDID(s) /* nothing */ 128 #endif /* not STRIP_FBSDID */ 129 130 #endif /* !_MACHINE_ASM_H_ */ 131