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_PLT(x) x@PLT 45 #define PIC_GOT(x) x@GOTPCREL(%rip) 46 #else 47 #define PIC_PLT(x) x 48 #endif 49 50 /* 51 * CNAME and HIDENAME manage the relationship between symbol names in C 52 * and the equivalent assembly language names. CNAME is given a name as 53 * it would be used in a C program. It expands to the equivalent assembly 54 * language name. HIDENAME is given an assembly-language name, and expands 55 * to a possibly-modified form that will be invisible to C programs. 56 */ 57 #define CNAME(csym) csym 58 #define HIDENAME(asmsym) .asmsym 59 60 #define _START_ENTRY .text; .p2align 4,0x90 61 62 #define _ENTRY(x) _START_ENTRY; \ 63 .globl CNAME(x); .type CNAME(x),@function; CNAME(x):; \ 64 .cfi_startproc 65 66 #ifdef PROF 67 #define ALTENTRY(x) _ENTRY(x); \ 68 pushq %rbp; \ 69 .cfi_def_cfa_offset 16; \ 70 .cfi_offset %rbp, -16; \ 71 movq %rsp,%rbp; \ 72 call PIC_PLT(HIDENAME(mcount)); \ 73 popq %rbp; \ 74 .cfi_restore %rbp; \ 75 .cfi_def_cfa_offset 8; \ 76 jmp 9f 77 #define ENTRY(x) _ENTRY(x); \ 78 pushq %rbp; \ 79 .cfi_def_cfa_offset 16; \ 80 .cfi_offset %rbp, -16; \ 81 movq %rsp,%rbp; \ 82 call PIC_PLT(HIDENAME(mcount)); \ 83 popq %rbp; \ 84 .cfi_restore %rbp; \ 85 .cfi_def_cfa_offset 8; \ 86 9: 87 #else 88 #define ALTENTRY(x) _ENTRY(x) 89 #define ENTRY(x) _ENTRY(x) 90 #endif 91 92 #define END(x) .size x, . - x; .cfi_endproc 93 /* 94 * WEAK_REFERENCE(): create a weak reference alias from sym. 95 * The macro is not a general asm macro that takes arbitrary names, 96 * but one that takes only C names. It does the non-null name 97 * translation inside the macro. 98 */ 99 #define WEAK_REFERENCE(sym, alias) \ 100 .weak CNAME(alias); \ 101 .equ CNAME(alias),CNAME(sym) 102 103 #define RCSID(x) .text; .asciz x 104 105 #undef __FBSDID 106 #if !defined(STRIP_FBSDID) 107 #define __FBSDID(s) .ident s 108 #else 109 #define __FBSDID(s) /* nothing */ 110 #endif /* !STRIP_FBSDID */ 111 112 #endif /* !_MACHINE_ASM_H_ */ 113