xref: /freebsd/sys/cddl/dev/dtrace/aarch64/dtrace_asm.S (revision 43faedc1339a9624c7acedb7f3e5624e64da5b99)
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 *
22 * $FreeBSD$
23 */
24/*
25 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
26 * Use is subject to license terms.
27 */
28
29#define _ASM
30#define _LOCORE
31
32#include <sys/cpuvar_defs.h>
33#include <sys/dtrace.h>
34
35#include <machine/armreg.h>
36#include <machine/asm.h>
37
38#include "assym.s"
39
40/*
41void dtrace_membar_producer(void)
42*/
43ENTRY(dtrace_membar_producer)
44	RET
45END(dtrace_membar_producer)
46
47/*
48void dtrace_membar_consumer(void)
49*/
50ENTRY(dtrace_membar_consumer)
51	RET
52END(dtrace_membar_consumer)
53
54/*
55dtrace_icookie_t dtrace_interrupt_disable(void)
56*/
57ENTRY(dtrace_interrupt_disable)
58	msr	daifset, #2
59	RET
60END(dtrace_interrupt_disable)
61
62/*
63void dtrace_interrupt_enable(dtrace_icookie_t cookie)
64*/
65ENTRY(dtrace_interrupt_enable)
66	msr	daifclr, #2
67	RET
68END(dtrace_interrupt_enable)
69/*
70uint8_t
71dtrace_fuword8_nocheck(void *addr)
72*/
73ENTRY(dtrace_fuword8_nocheck)
74	ldrb	w0, [x0]
75	RET
76END(dtrace_fuword8_nocheck)
77
78/*
79uint16_t
80dtrace_fuword16_nocheck(void *addr)
81*/
82ENTRY(dtrace_fuword16_nocheck)
83	ldrh	w0, [x0]
84	RET
85END(dtrace_fuword16_nocheck)
86
87/*
88uint32_t
89dtrace_fuword32_nocheck(void *addr)
90*/
91ENTRY(dtrace_fuword32_nocheck)
92	ldr	w0, [x0]
93	RET
94END(dtrace_fuword32_nocheck)
95
96/*
97uint64_t
98dtrace_fuword64_nocheck(void *addr)
99*/
100ENTRY(dtrace_fuword64_nocheck)
101	ldr	x0, [x0]
102	RET
103END(dtrace_fuword64_nocheck)
104
105/*
106void
107dtrace_copy(uintptr_t uaddr, uintptr_t kaddr, size_t size)
108*/
109ENTRY(dtrace_copy)
110	cbz	x2, 2f		/* If len == 0 then skip loop */
1111:
112	ldrb	w4, [x0], #1	/* Load from uaddr */
113	strb	w4, [x1], #1	/* Store in kaddr */
114	sub	x2, x2, #1	/* len-- */
115	cbnz	x2, 1b
1162:
117	RET
118END(dtrace_copy)
119
120/*
121void
122dtrace_copystr(uintptr_t uaddr, uintptr_t kaddr, size_t size,
123    volatile uint16_t *flags)
124XXX: Check for flags?
125*/
126ENTRY(dtrace_copystr)
127	cbz     x2, 2f          /* If len == 0 then skip loop */
128
1291:	ldrb    w4, [x0], #1    /* Load from uaddr */
130	strb    w4, [x1], #1    /* Store in kaddr */
131	cbz     w4, 2f          /* If == 0 then break */
132	sub     x2, x2, #1      /* len-- */
133	cbnz    x2, 1b
1342:
135	RET
136END(dtrace_copystr)
137
138/*
139uintptr_t
140dtrace_caller(int aframes)
141*/
142ENTRY(dtrace_caller)
143	mov	x0, #-1
144	RET
145END(dtrace_caller)
146
147/*
148uint32_t
149dtrace_cas32(uint32_t *target, uint32_t cmp, uint32_t new)
150*/
151ENTRY(dtrace_cas32)
1521:	ldxr	w3, [x0]	/* Load target */
153	cmp	w3, w1		/* Check if *target == cmp */
154	bne	2f		/* No, return */
155	stxr	w12, w2, [x0]	/* Store new to target */
156	cbnz	w12, 1b		/* Try again if store not succeed */
1572:	mov	w0, w3		/* Return the value loaded from target */
158	RET
159END(dtrace_cas32)
160
161/*
162void *
163dtrace_casptr(volatile void *target, volatile void *cmp, volatile void *new)
164*/
165ENTRY(dtrace_casptr)
1661:	ldxr	x3, [x0]	/* Load target */
167	cmp	x3, x1		/* Check if *target == cmp */
168	bne	2f		/* No, return */
169	stxr	w12, x2, [x0]	/* Store new to target */
170	cbnz	w12, 1b		/* Try again if store not succeed */
1712:	mov	x0, x3		/* Return the value loaded from target */
172	RET
173END(dtrace_casptr)
174