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
|
/* $FreeBSD$ */
/* From: NetBSD: asm.h,v 1.18 1997/11/03 04:22:06 ross Exp */
/*
* Copyright (c) 1991,1990,1989,1994,1995,1996 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* Assembly coding style
*
* This file contains macros and register defines to
* aid in writing more readable assembly code.
* Some rules to make assembly code understandable by
* a debugger are also noted.
*
* The document
*
* "ALPHA Calling Standard", DEC 27-Apr-90
*
* defines (a superset of) the rules and conventions
* we use. While we make no promise of adhering to
* such standard and its evolution (esp where we
* can get faster code paths) it is certainly intended
* that we be interoperable with such standard.
*
* In this sense, this file is a proper part of the
* definition of the (software) Alpha architecture.
*/
/*
* Macro to make a local label name.
*/
#define LLABEL(name,num) L ## name ## num
/*
* MCOUNT
*/
#if !defined(GPROF) && !defined(PROF)
#define MCOUNT /* nothing */
#else
#define MCOUNT \
.set noat; \
jsr at_reg,_mcount; \
.set at
#endif
/*
* ENTRY
* Declare a global leaf function.
* A leaf function does not call other functions.
*/
#define ENTRY(_name_, _n_args_) \
.global _name_; \
.align 16; \
.proc _name_; \
_name_:; \
.regstk _n_args_, 0, 0, 0 \
MCOUNT
#define ENTRY_NOPROFILE(_name_, _n_args_) \
.global _name_; \
.align 16; \
.proc _name_; \
_name_:; \
.regstk _n_args_, 0, 0, 0
/*
* STATIC_ENTRY
* Declare a local leaf function.
*/
#define STATIC_ENTRY(_name_, _n_args_) \
.align 16; \
.proc _name_; \
_name_:; \
.regstk _n_args_, 0, 0, 0 \
MCOUNT
/*
* XENTRY
* Global alias for a leaf function, or alternate entry point
*/
#define XENTRY(_name_) \
.globl _name_; \
_name_:
/*
* STATIC_XENTRY
* Local alias for a leaf function, or alternate entry point
*/
#define STATIC_XENTRY(_name_) \
_name_:
/*
* END
* Function delimiter
*/
#define END(_name_) \
.endp _name_
/*
* EXPORT
* Export a symbol
*/
#define EXPORT(_name_) \
.global _name_; \
_name_:
/*
* IMPORT
* Make an external name visible, typecheck the size
*/
#define IMPORT(_name_, _size_) \
/* .extern _name_,_size_ */
/*
* ABS
* Define an absolute symbol
*/
#define ABS(_name_, _value_) \
.globl _name_; \
_name_ = _value_
/*
* BSS
* Allocate un-initialized space for a global symbol
*/
#define BSS(_name_,_numbytes_) \
.comm _name_,_numbytes_
/*
* MSG
* Allocate space for a message (a read-only ascii string)
*/
#define ASCIZ .asciz
#define MSG(msg,reg,label) \
addl reg,@ltoff(label),gp;; \
ld8 reg=[reg];; \
.data; \
label: ASCIZ msg; \
.text;
/*
* System call glue.
*/
#define SYSCALLNUM(name) \
SYS_ ## name
#define CALLSYS_NOERROR(name) \
mov r15=SYSCALLNUM(name); \
break 0x100000 ;;
/*
* WEAK_ALIAS: create a weak alias (ELF only).
*/
#ifdef __ELF__
#define WEAK_ALIAS(alias,sym) \
.weak alias; \
alias = sym
#endif
/*
* Kernel RCS ID tag and copyright macros
*/
#ifdef _KERNEL
#ifdef __ELF__
#define __KERNEL_SECTIONSTRING(_sec, _str) \
.section _sec ; .asciz _str ; .text
#else /* __ELF__ */
#define __KERNEL_SECTIONSTRING(_sec, _str) \
.data ; .asciz _str ; .align 3 ; .text
#endif /* __ELF__ */
#define __KERNEL_RCSID(_n, _s) __KERNEL_SECTIONSTRING(.ident, _s)
#define __KERNEL_COPYRIGHT(_n, _s) __KERNEL_SECTIONSTRING(.copyright, _s)
#ifdef NO_KERNEL_RCSIDS
#undef __KERNEL_RCSID
#define __KERNEL_RCSID(_n, _s) /* nothing */
#endif
#endif /* _KERNEL */
|
