FreeBSD/Linux Kernel Cross Reference
sys/kern/genassym.awk
1 # $NetBSD: genassym.awk,v 1.5 1998/11/25 06:10:19 castor Exp $
2
3 #
4 # Copyright (c) 1997 The NetBSD Foundation, Inc.
5 # All rights reserved.
6 #
7 # This code is derived from software contributed to The NetBSD Foundation
8 # by Gordon W. Ross
9 #
10 # Redistribution and use in source and binary forms, with or without
11 # modification, are permitted provided that the following conditions
12 # are met:
13 # 1. Redistributions of source code must retain the above copyright
14 # notice, this list of conditions and the following disclaimer.
15 # 2. Redistributions in binary form must reproduce the above copyright
16 # notice, this list of conditions and the following disclaimer in the
17 # documentation and/or other materials provided with the distribution.
18 # 3. All advertising materials mentioning features or use of this software
19 # must display the following acknowledgement:
20 # This product includes software developed by the NetBSD
21 # Foundation, Inc. and its contributors.
22 # 4. Neither the name of The NetBSD Foundation nor the names of its
23 # contributors may be used to endorse or promote products derived
24 # from this software without specific prior written permission.
25 #
26 # THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 # ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 # TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 # POSSIBILITY OF SUCH DAMAGE.
37 #
38
39 # This parses the assembly file genassym.s and translates each
40 # element of the assyms[] array into a cpp define. The assembly
41 # file genassym.s is simply compiled from plain old C code. See
42 # src/sys/arch/sun3/sun3/genassym.c for an example of the C code,
43 # and see src/sys/arch/sun3/conf/Makefile.sun3 for an example of
44 # the make rules that build assym.h using this program.
45 #
46 # Using actual C code for this (instead of genassym.cf)
47 # has the advantage that "make depend" automatically
48 # tracks dependencies of this C code on the (many)
49 # header files used here. Also, this awk script is
50 # much smaller and simpler than sys/kern/genassym.sh.
51 #
52 # Both this method and the genassym.cf method have the
53 # disadvantage that they depend on gcc-specific features.
54 # This method depends on the format of assembly output for
55 # data, and the genassym.cf method depends on features of
56 # the gcc asm() statement (inline assembly).
57 #
58 # Matthias Pfaller deserves credit for the basic idea of
59 # translating cc output (assembly) into an assym.h file.
60 # This variant of the method was developed by Gordon Ross.
61
62 BEGIN {
63 len = 0;
64 val = 0;
65 str = "";
66 translate = 0;
67 }
68
69 # This marks the beginning of the part we should translate.
70 # Note: leading _ is absent on some platforms (e.g. alpha).
71 /^_?assyms:/ {
72 translate = 1;
73 }
74
75 /^\t\.ascii/ {
76 if (!translate)
77 next;
78 # Get NAME from '"NAME\*"'
79 len = index($2, "\\");
80 str = substr($2,2,len-2);
81 printf("#define\t%s\t", str);
82 next;
83 }
84
85 /^\t\.(skip|zero)/ {
86 next;
87 }
88
89 /^\t\.(long|quad|word)/ {
90 if (!translate)
91 next;
92 printf("%s\n", $2);
93 next;
94 }
95
96 # This marks the end of the part we should translate.
97 # Note: leading _ is absent on some platforms (e.g. alpha).
98 /^_?nassyms:/ {
99 exit;
100 }
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