1/* -*- mode: asm -*- */
2/*-
3 * SPDX-License-Identifier: BSD-3-Clause
4 *
5 * Copyright (c) 1993 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef _MACHINE_ASMACROS_H_
34#define _MACHINE_ASMACROS_H_
35
36#include <sys/cdefs.h>
37
38/* XXX too much duplication in various asm*.h's. */
39
40/*
41 * CNAME is used to manage the relationship between symbol names in C
42 * and the equivalent assembly language names. CNAME is given a name as
43 * it would be used in a C program. It expands to the equivalent assembly
44 * language name.
45 */
46#define CNAME(csym) csym
47
48#define ALIGN_DATA .p2align 2 /* 4 byte alignment, zero filled */
49#define ALIGN_TEXT .p2align 2,0x90 /* 4-byte alignment, nop filled */
50#define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
51
52#define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \
53 .type CNAME(name),@function; CNAME(name):
54#define ENTRY(name) GEN_ENTRY(name)
55#define ALTENTRY(name) GEN_ENTRY(name)
56#define END(name) .size name, . - name
57
58#ifdef LOCORE
59
60#define GSEL_KPL 0x0020 /* GSEL(GCODE_SEL, SEL_KPL) */
61#define SEL_RPL_MASK 0x0003
62
63/*
64 * Convenience macro for declaring interrupt entry points.
65 */
66#define IDTVEC(name) ALIGN_TEXT; .globl __CONCAT(X,name); \
67 .type __CONCAT(X,name),@function; __CONCAT(X,name):
68
69/*
70 * Macros to create and destroy a trap frame.
71 */
72 .macro PUSH_FRAME2
73 pushal
74 pushl $0
75 movw %ds,(%esp)
76 pushl $0
77 movw %es,(%esp)
78 pushl $0
79 movw %fs,(%esp)
80 movl %esp,%ebp
81 .endm
82
83 .macro PUSH_FRAME
84 pushl $0 /* dummy error code */
85 pushl $0 /* dummy trap type */
86 PUSH_FRAME2
87 .endm
88
89/*
90 * Access per-CPU data.
91 */
92#define PCPU(member) %fs:PC_ ## member
93
94#define PCPU_ADDR(member, reg) \
95 movl %fs:PC_PRVSPACE, reg ; \
96 addl $PC_ ## member, reg
97
98/*
99 * Setup the kernel segment registers.
100 */
101 .macro SET_KERNEL_SREGS
102 movl $KDSEL, %eax /* reload with kernel's data segment */
103 movl %eax, %ds
104 movl %eax, %es
105 movl $KPSEL, %eax /* reload with per-CPU data segment */
106 movl %eax, %fs
107 .endm
108
109 .macro NMOVE_STACKS
110 movl PCPU(KESP0), %edx
111 movl $TF_SZ, %ecx
112 testl $PSL_VM, TF_EFLAGS(%esp)
113 jz .L\@.1
114 addl $VM86_STACK_SPACE, %ecx
115.L\@.1: subl %ecx, %edx
116 movl %edx, %edi
117 movl %esp, %esi
118 rep; movsb
119 movl %edx, %esp
120 .endm
121
122 .macro LOAD_KCR3
123 call .L\@.1
124.L\@.1: popl %eax
125 movl (tramp_idleptd - .L\@.1)(%eax), %eax
126 movl %eax, %cr3
127 .endm
128
129 .macro MOVE_STACKS
130 LOAD_KCR3
131 NMOVE_STACKS
132 .endm
133
134 .macro KENTER
135 testl $PSL_VM, TF_EFLAGS(%esp)
136 jz .L\@.1
137 LOAD_KCR3
138 movl PCPU(CURPCB), %eax
139 testl $PCB_VM86CALL, PCB_FLAGS(%eax)
140 jnz .L\@.3
141 NMOVE_STACKS
142 movl $handle_ibrs_entry,%edx
143 call *%edx
144 jmp .L\@.3
145.L\@.1: testb $SEL_RPL_MASK, TF_CS(%esp)
146 jz .L\@.3
147.L\@.2: MOVE_STACKS
148 movl $handle_ibrs_entry,%edx
149 call *%edx
150.L\@.3:
151 .endm
152
153#endif /* LOCORE */
154
155#ifdef __STDC__
156#define ELFNOTE(name, type, desctype, descdata...) \
157.pushsection .note.name, "a", @note ; \
158 .align 4 ; \
159 .long 2f - 1f /* namesz */ ; \
160 .long 4f - 3f /* descsz */ ; \
161 .long type ; \
1621:.asciz #name ; \
1632:.align 4 ; \
1643:desctype descdata ; \
1654:.align 4 ; \
166.popsection
167#else /* !__STDC__, i.e. -traditional */
168#define ELFNOTE(name, type, desctype, descdata) \
169.pushsection .note.name, "a", @note ; \
170 .align 4 ; \
171 .long 2f - 1f /* namesz */ ; \
172 .long 4f - 3f /* descsz */ ; \
173 .long type ; \
1741:.asciz "name" ; \
1752:.align 4 ; \
1763:desctype descdata ; \
1774:.align 4 ; \
178.popsection
179#endif /* __STDC__ */
180
181#endif /* !_MACHINE_ASMACROS_H_ */