| 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_ */ |