asm.h revision 290079 
1/*-
2 * Copyright (c) 2014 Andrew Turner
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/arm64/include/asm.h 290079 2015-10-27 22:24:57Z andrew $
27 */
28
29#ifndef _MACHINE_ASM_H_
30#define	_MACHINE_ASM_H_
31
32#undef __FBSDID
33#if !defined(lint) && !defined(STRIP_FBSDID)
34#define	__FBSDID(s)     .ident s
35#else
36#define	__FBSDID(s)     /* nothing */
37#endif
38
39#define	_C_LABEL(x)	x
40
41#define	ENTRY(sym)						\
42	.text; .globl sym; .align 2; .type sym,#function; sym:
43#define	EENTRY(sym)						\
44	.globl	sym; sym:
45#define	END(sym) .size sym, . - sym
46#define	EEND(sym)
47
48#define	WEAK_REFERENCE(sym, alias)				\
49	.weak alias;						\
50	.set alias,sym
51
52#define	UINT64_C(x)	(x)
53
54#if defined(PIC)
55#define	PIC_SYM(x,y)	x ## @ ## y
56#else
57#define	PIC_SYM(x,y)	x
58#endif
59
60/*
61 * Sets the trap fault handler. The exception handler will return to the
62 * address in the handler register on a data abort or the xzr register to
63 * clear the handler. The tmp parameter should be a register able to hold
64 * the temporary data.
65 */
66#define	SET_FAULT_HANDLER(handler, tmp)					\
67	ldr	tmp, [x18, #PC_CURTHREAD];	/* Load curthread */	\
68	ldr	tmp, [tmp, #TD_PCB];		/* Load the pcb */	\
69	str	handler, [tmp, #PCB_ONFAULT]	/* Set the handler */
70
71#endif /* _MACHINE_ASM_H_ */
72