master
1/* $NetBSD: asm.h,v 1.5 2003/08/07 16:26:53 agc Exp $ */
2
3/*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 1990 The Regents of the University of California.
7 * All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * William Jolitz.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)asm.h 5.5 (Berkeley) 5/7/91
37 */
38
39#ifndef _MACHINE_ASM_H_
40#define _MACHINE_ASM_H_
41#include <sys/cdefs.h>
42
43#define _C_LABEL(x) x
44#define _ASM_LABEL(x) x
45
46#ifndef _ALIGN_TEXT
47# define _ALIGN_TEXT .align 2
48#endif
49
50#ifndef _STANDALONE
51#define STOP_UNWINDING .cantunwind
52#define _FNSTART .fnstart
53#define _FNEND .fnend
54#define _SAVE(...) .save __VA_ARGS__
55#else
56#define STOP_UNWINDING
57#define _FNSTART
58#define _FNEND
59#define _SAVE(...)
60#endif
61
62/*
63 * gas/arm uses @ as a single comment character and thus cannot be used here.
64 * It recognises the # instead of an @ symbol in .type directives.
65 */
66#define _ASM_TYPE_FUNCTION #function
67#define _ASM_TYPE_OBJECT #object
68
69/*
70 * EENTRY()/EEND() mark "extra" entry/exit points from a function.
71 * LEENTRY()/LEEND() are the same for local symbols.
72 * The unwind info cannot handle the concept of a nested function, or a function
73 * with multiple .fnstart directives, but some of our assembler code is written
74 * with multiple labels to allow entry at several points. The EENTRY() macro
75 * defines such an extra entry point without a new .fnstart, so that it's
76 * basically just a label that you can jump to. The EEND() macro does nothing
77 * at all, except document the exit point associated with the same-named entry.
78 */
79#define GLOBAL(x) .global x
80
81#ifdef __thumb__
82#define _FUNC_MODE .code 16; .thumb_func
83#else
84#define _FUNC_MODE .code 32
85#endif
86
87#define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x:
88#define _LEEND(x) /* nothing */
89#define _EENTRY(x) GLOBAL(x); _LEENTRY(x)
90#define _EEND(x) _LEEND(x)
91
92#define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART
93#define _LEND(x) .size x, . - x; _FNEND
94#define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART
95#define _END(x) _LEND(x)
96
97#define ENTRY(y) _ENTRY(_C_LABEL(y));
98#define EENTRY(y) _EENTRY(_C_LABEL(y));
99#define ENTRY_NP(y) _ENTRY(_C_LABEL(y))
100#define EENTRY_NP(y) _EENTRY(_C_LABEL(y))
101#define END(y) _END(_C_LABEL(y))
102#define EEND(y) _EEND(_C_LABEL(y))
103#define ASENTRY(y) _ENTRY(_ASM_LABEL(y));
104#define ASLENTRY(y) _LENTRY(_ASM_LABEL(y));
105#define ASEENTRY(y) _EENTRY(_ASM_LABEL(y));
106#define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y));
107#define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y))
108#define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y))
109#define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y))
110#define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y))
111#define ASEND(y) _END(_ASM_LABEL(y))
112#define ASLEND(y) _LEND(_ASM_LABEL(y))
113#define ASEEND(y) _EEND(_ASM_LABEL(y))
114#define ASLEEND(y) _LEEND(_ASM_LABEL(y))
115
116#define ASMSTR .asciz
117
118#if defined(PIC)
119#define PLT_SYM(x) PIC_SYM(x, PLT)
120#define GOT_SYM(x) PIC_SYM(x, GOT)
121#define GOT_GET(x,got,sym) \
122 ldr x, sym; \
123 ldr x, [x, got]
124#define GOT_INIT(got,gotsym,pclabel) \
125 ldr got, gotsym; \
126 pclabel: add got, pc
127#ifdef __thumb__
128#define GOT_INITSYM(gotsym,pclabel) \
129 .align 2; \
130 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4)
131#else
132#define GOT_INITSYM(gotsym,pclabel) \
133 .align 2; \
134 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8)
135#endif
136
137#ifdef __STDC__
138#define PIC_SYM(x,y) x ## ( ## y ## )
139#else
140#define PIC_SYM(x,y) x/**/(/**/y/**/)
141#endif
142
143#else
144#define PLT_SYM(x) x
145#define GOT_SYM(x) x
146#define GOT_GET(x,got,sym) \
147 ldr x, sym;
148#define GOT_INIT(got,gotsym,pclabel)
149#define GOT_INITSYM(gotsym,pclabel)
150#define PIC_SYM(x,y) x
151#endif /* PIC */
152
153#undef __FBSDID
154#if !defined(lint) && !defined(STRIP_FBSDID)
155#define __FBSDID(s) .ident s
156#else
157#define __FBSDID(s) /* nothing */
158#endif
159
160#define WEAK_ALIAS(alias,sym) \
161 .weak alias; \
162 alias = sym
163
164#ifdef __STDC__
165#define WARN_REFERENCES(sym,msg) \
166 .stabs msg ## ,30,0,0,0 ; \
167 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
168#else
169#define WARN_REFERENCES(sym,msg) \
170 .stabs msg,30,0,0,0 ; \
171 .stabs __STRING(sym),1,0,0,0
172#endif /* __STDC__ */
173
174# define RET bx lr
175# define RETeq bxeq lr
176# define RETne bxne lr
177# define RETc(c) bx##c lr
178
179#if __ARM_ARCH >= 7
180#define ISB isb
181#define DSB dsb
182#define DMB dmb
183#define WFI wfi
184
185#if defined(__ARM_ARCH_7VE__) || defined(__clang__)
186#define MSR_ELR_HYP(regnum) msr elr_hyp, lr
187#define ERET eret
188#else
189#define MSR_ELR_HYP(regnum) .word (0xe12ef300 | regnum)
190#define ERET .word 0xe160006e
191#endif
192
193#elif __ARM_ARCH == 6
194#include <machine/sysreg.h>
195#define ISB mcr CP15_CP15ISB
196#define DSB mcr CP15_CP15DSB
197#define DMB mcr CP15_CP15DMB
198#define WFI mcr CP15_CP15WFI
199#endif
200
201#endif /* !_MACHINE_ASM_H_ */