1/* $OpenBSD: asm.h,v 1.8 2022/12/06 00:08:38 jca Exp $ */
2
3/*
4 * Copyright (c) 2020 Brian Bamsch <bbamsch@google.com>
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * William Jolitz.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * from: @(#)asm.h 5.5 (Berkeley) 5/7/91
36 */
37
38#ifndef _MACHINE_ASM_H_
39#define _MACHINE_ASM_H_
40
41#define _C_LABEL(x) x
42#define _ASM_LABEL(x) x
43
44#ifdef __STDC__
45# define __CONCAT(x,y) x ## y
46# define __STRING(x) #x
47#else
48# define __CONCAT(x,y) x/**/y
49# define __STRING(x) "x"
50#endif
51
52#ifndef _ALIGN_TEXT
53# define _ALIGN_TEXT .align 0
54#endif
55
56/* NB == No Binding: use .globl or .weak as necessary */
57#define _ENTRY_NB(x) \
58 .text; .p2align 1; .type x,@function; x:
59#define _ENTRY(x) .globl x; _ENTRY_NB(x)
60
61#if defined(PROF) || defined(GPROF)
62// XXX Profiler Support
63#define _PROF_PROLOGUE \
64 addi sp, sp, -16; \
65 sd ra, 8(sp); \
66 sd fp, 0(sp); \
67 mv fp, sp; \
68 call __mcount; \
69 ld ra, 8(sp); \
70 ld fp, 0(sp); \
71 add sp, sp, 16;
72#else
73#define _PROF_PROLOGUE
74#endif
75
76#if defined(_RET_PROTECTOR)
77// XXX Retguard Support
78#error RETGUARD not yet supported for riscv64
79#else
80#define RETGUARD_CALC_COOKIE(reg)
81#define RETGUARD_LOAD_RANDOM(x, reg)
82#define RETGUARD_SETUP(x, reg)
83#define RETGUARD_CHECK(x, reg)
84#define RETGUARD_PUSH(reg)
85#define RETGUARD_POP(reg)
86#define RETGUARD_SYMBOL(x)
87#endif
88
89#define ENTRY(y) _ENTRY(y); _PROF_PROLOGUE
90#define ENTRY_NP(y) _ENTRY(y)
91#define ENTRY_NB(y) _ENTRY_NB(y); _PROF_PROLOGUE
92#define ASENTRY(y) _ENTRY(y); _PROF_PROLOGUE
93#define ASENTRY_NP(y) _ENTRY(y)
94#define END(y) .size y, . - y
95#define EENTRY(sym) .globl sym; sym:
96#define EEND(sym)
97
98#ifdef __PIC__
99#define PIC_SYM(x,y) x(y)
100#else
101#define PIC_SYM(x,y) x
102#endif
103
104#define STRONG_ALIAS(alias,sym) \
105 .global alias; \
106 alias = sym
107#define WEAK_ALIAS(alias,sym) \
108 .weak alias; \
109 alias = sym
110
111#define SWAP_FAULT_HANDLER(handler, tmp0, tmp1) \
112 ld tmp0, CI_CURPCB(tp); /* Load the pcb */ \
113 ld tmp1, PCB_ONFAULT(tmp0); /* Save old handler */ \
114 sd handler, PCB_ONFAULT(tmp0); /* Set the handler */ \
115 mv handler, tmp1
116
117#define SET_FAULT_HANDLER(handler, pcb) \
118 ld pcb, CI_CURPCB(tp); /* Load the pcb */ \
119 sd handler, PCB_ONFAULT(pcb) /* Set the handler */
120
121#define ENTER_USER_ACCESS(tmp) \
122 li tmp, SSTATUS_SUM; \
123 csrs sstatus, tmp
124
125#define EXIT_USER_ACCESS(tmp) \
126 li tmp, SSTATUS_SUM; \
127 csrc sstatus, tmp
128
129#endif /* _MACHINE_ASM_H_ */