1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
|
/* -*- mode: asm -*- */
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1993 The Regents of the University of California.
* All rights reserved.
*
* Copyright (c) 2018 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by
* Konstantin Belousov <kib@FreeBSD.org> under sponsorship from
* the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(__i386__)
#include <i386/asmacros.h>
#else /* !__i386__ */
#ifndef _MACHINE_ASMACROS_H_
#define _MACHINE_ASMACROS_H_
#include <sys/cdefs.h>
/* XXX too much duplication in various asm*.h's. */
/*
* CNAME is used to manage the relationship between symbol names in C
* and the equivalent assembly language names. CNAME is given a name as
* it would be used in a C program. It expands to the equivalent assembly
* language name.
*/
#define CNAME(csym) csym
#define ALIGN_DATA .p2align 3 /* 8 byte alignment, zero filled */
#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
#define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
#define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \
.type CNAME(name),@function; CNAME(name):
#define ENTRY(name) GEN_ENTRY(name)
#define ALTENTRY(name) GEN_ENTRY(name)
#define END(name) .size name, . - name
/*
* Convenience for adding frame pointers to hand-coded ASM. Useful for
* DTrace, HWPMC, and KDB.
*/
#define PUSH_FRAME_POINTER \
pushq %rbp ; \
movq %rsp, %rbp ;
#define POP_FRAME_POINTER \
popq %rbp
#ifdef LOCORE
/*
* Access per-CPU data.
*/
#define PCPU(member) %gs:PC_ ## member
#define PCPU_ADDR(member, reg) \
movq %gs:PC_PRVSPACE, reg ; \
addq $PC_ ## member, reg
/*
* Convenience macro for declaring interrupt entry points.
*/
#define IDTVEC(name) ALIGN_TEXT; .globl __CONCAT(X,name); \
.type __CONCAT(X,name),@function; __CONCAT(X,name):
.macro SAVE_SEGS
movw %fs,TF_FS(%rsp)
movw %gs,TF_GS(%rsp)
movw %es,TF_ES(%rsp)
movw %ds,TF_DS(%rsp)
.endm
.macro MOVE_STACKS qw
.L.offset=0
.rept \qw
movq .L.offset(%rsp),%rdx
movq %rdx,.L.offset(%rax)
.L.offset=.L.offset+8
.endr
.endm
.macro PTI_UUENTRY has_err
movq PCPU(KCR3),%rax
movq %rax,%cr3
movq PCPU(RSP0),%rax
subq $PTI_SIZE - 8 * (1 - \has_err),%rax
MOVE_STACKS ((PTI_SIZE / 8) - 1 + \has_err)
movq %rax,%rsp
popq %rdx
popq %rax
.endm
.macro PTI_UENTRY has_err
swapgs
lfence
cmpq $~0,PCPU(UCR3)
je 1f
pushq %rax
pushq %rdx
PTI_UUENTRY \has_err
1:
.endm
.macro PTI_ENTRY name, contk, contu, has_err=0
ALIGN_TEXT
.globl X\name\()_pti
.type X\name\()_pti,@function
X\name\()_pti:
/* %rax, %rdx, and possibly err are not yet pushed */
testb $SEL_RPL_MASK,PTI_CS-PTI_ERR-((1-\has_err)*8)(%rsp)
jz \contk
PTI_UENTRY \has_err
jmp \contu
.endm
.macro PTI_INTRENTRY vec_name
SUPERALIGN_TEXT
.globl X\vec_name\()_pti
.type X\vec_name\()_pti,@function
X\vec_name\()_pti:
testb $SEL_RPL_MASK,PTI_CS-3*8(%rsp) /* err, %rax, %rdx not pushed */
jz .L\vec_name\()_u
PTI_UENTRY has_err=0
jmp .L\vec_name\()_u
.endm
.macro INTR_PUSH_FRAME vec_name
SUPERALIGN_TEXT
.globl X\vec_name
.type X\vec_name,@function
X\vec_name:
testb $SEL_RPL_MASK,PTI_CS-3*8(%rsp) /* come from kernel? */
jz .L\vec_name\()_u /* Yes, dont swapgs again */
swapgs
.L\vec_name\()_u:
lfence
subq $TF_RIP,%rsp /* skip dummy tf_err and tf_trapno */
movq %rdi,TF_RDI(%rsp)
movq %rsi,TF_RSI(%rsp)
movq %rdx,TF_RDX(%rsp)
movq %rcx,TF_RCX(%rsp)
movq %r8,TF_R8(%rsp)
movq %r9,TF_R9(%rsp)
movq %rax,TF_RAX(%rsp)
movq %rbx,TF_RBX(%rsp)
movq %rbp,TF_RBP(%rsp)
movq %r10,TF_R10(%rsp)
movq %r11,TF_R11(%rsp)
movq %r12,TF_R12(%rsp)
movq %r13,TF_R13(%rsp)
movq %r14,TF_R14(%rsp)
movq %r15,TF_R15(%rsp)
SAVE_SEGS
movl $TF_HASSEGS,TF_FLAGS(%rsp)
pushfq
andq $~(PSL_D|PSL_AC),(%rsp)
popfq
testb $SEL_RPL_MASK,TF_CS(%rsp) /* come from kernel ? */
jz 1f /* yes, leave PCB_FULL_IRET alone */
movq PCPU(CURPCB),%r8
andl $~PCB_FULL_IRET,PCB_FLAGS(%r8)
call handle_ibrs_entry
1:
.endm
.macro INTR_HANDLER vec_name
.text
PTI_INTRENTRY \vec_name
INTR_PUSH_FRAME \vec_name
.endm
.macro RESTORE_REGS
movq TF_RDI(%rsp),%rdi
movq TF_RSI(%rsp),%rsi
movq TF_RDX(%rsp),%rdx
movq TF_RCX(%rsp),%rcx
movq TF_R8(%rsp),%r8
movq TF_R9(%rsp),%r9
movq TF_RAX(%rsp),%rax
movq TF_RBX(%rsp),%rbx
movq TF_RBP(%rsp),%rbp
movq TF_R10(%rsp),%r10
movq TF_R11(%rsp),%r11
movq TF_R12(%rsp),%r12
movq TF_R13(%rsp),%r13
movq TF_R14(%rsp),%r14
movq TF_R15(%rsp),%r15
.endm
#ifdef KMSAN
/*
* The KMSAN runtime relies on a TLS block to track initialization and origin
* state for function parameters and return values. To keep this state
* consistent in the face of asynchronous kernel-mode traps, the runtime
* maintains a stack of blocks: when handling an exception or interrupt,
* kmsan_intr_enter() pushes the new block to be used until the handler is
* complete, at which point kmsan_intr_leave() restores the previous block.
*
* Thus, KMSAN_ENTER/LEAVE hooks are required only in handlers for events that
* may have happened while in kernel-mode. In particular, they are not required
* around amd64_syscall() or ast() calls. Otherwise, kmsan_intr_enter() can be
* called unconditionally, without distinguishing between entry from user-mode
* or kernel-mode.
*/
#define KMSAN_ENTER callq kmsan_intr_enter
#define KMSAN_LEAVE callq kmsan_intr_leave
#else
#define KMSAN_ENTER
#define KMSAN_LEAVE
#endif
#endif /* LOCORE */
#ifdef __STDC__
#define ELFNOTE(name, type, desctype, descdata...) \
.pushsection .note.name, "a", @note ; \
.align 4 ; \
.long 2f - 1f /* namesz */ ; \
.long 4f - 3f /* descsz */ ; \
.long type ; \
1:.asciz #name ; \
2:.align 4 ; \
3:desctype descdata ; \
4:.align 4 ; \
.popsection
#else /* !__STDC__, i.e. -traditional */
#define ELFNOTE(name, type, desctype, descdata) \
.pushsection .note.name, "a", @note ; \
.align 4 ; \
.long 2f - 1f /* namesz */ ; \
.long 4f - 3f /* descsz */ ; \
.long type ; \
1:.asciz "name" ; \
2:.align 4 ; \
3:desctype descdata ; \
4:.align 4 ; \
.popsection
#endif /* __STDC__ */
#endif /* !_MACHINE_ASMACROS_H_ */
#endif /* __i386__ */
|
