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