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
|
#!/usr/bin/perl
#
# insns.pl produce insnsa.c and insnsd.c from insns.dat
#
# The Netwide Assembler is copyright (C) 1996 Simon Tatham and
# Julian Hall. All rights reserved. The software is
# redistributable under the licence given in the file "Licence"
# distributed in the NASM archive.
print STDERR "Reading insns.dat...\n";
$fname = "insns.dat" unless $fname = $ARGV[0];
open (F, $fname) || die "unable to open $fname";
$line = 0;
$opcodes = 0;
$insns = 0;
while (<F>) {
$line++;
next if /^\s*;/; # comments
chomp;
split;
next if $#_ == -1; # blank lines
(warn "line $line does not contain four fields\n"), next if $#_ != 3;
($formatted, $nd) = &format(@_);
if ($formatted) {
$insns++;
$aname = "aa_$_[0]";
push @$aname, $formatted;
}
$opcodes[$opcodes++] = $_[0], $done{$_[0]} = 1 if !$done{$_[0]};
if ($formatted && !$nd) {
push @big, $formatted;
foreach $i (&startbyte($_[2])) {
$aname = sprintf "dd_%02X",$i;
push @$aname, $#big;
}
}
}
close F;
print STDERR "Writing insnsa.c...\n";
open A, ">insnsa.c";
print A "/* This file auto-generated from insns.dat by insns.pl" .
" - don't edit it */\n\n";
print A "#include <stdio.h>\n";
print A "#include \"nasm.h\"\n";
print A "#include \"insns.h\"\n";
print A "\n";
foreach $i (@opcodes) {
print A "static struct itemplate instrux_${i}[] = {\n";
$aname = "aa_$i";
foreach $j (@$aname) {
print A " $j\n";
}
print A " {-1}\n};\n\n";
}
print A "struct itemplate *nasm_instructions[] = {\n";
foreach $i (@opcodes) {
print A " instrux_${i},\n";
}
print A "};\n";
close A;
print STDERR "Writing insnsd.c...\n";
open D, ">insnsd.c";
print D "/* This file auto-generated from insns.dat by insns.pl" .
" - don't edit it */\n\n";
print D "#include <stdio.h>\n";
print D "#include \"nasm.h\"\n";
print D "#include \"insns.h\"\n";
print D "\n";
print D "static struct itemplate instrux[] = {\n";
foreach $j (@big) {
print D " $j\n";
}
print D " {-1}\n};\n\n";
for ($c=0; $c<256; $c++) {
$h = sprintf "%02X", $c;
print D "static struct itemplate *itable_${h}[] = {\n";
$aname = "dd_$h";
foreach $j (@$aname) {
print D " instrux + $j,\n";
}
print D " NULL\n};\n\n";
}
print D "struct itemplate **itable[] = {\n";
for ($c=0; $c<256; $c++) {
printf D " itable_%02X,\n", $c;
}
print D "};\n";
close D;
printf STDERR "Done: %d instructions\n", $insns;
sub format {
local ($opcode, $operands, $codes, $flags) = @_;
local $num, $nd = 0;
return (undef, undef) if $operands eq "ignore";
# format the operands
$operands =~ s/:/|colon,/g;
$operands =~ s/mem(\d+)/mem|bits$1/g;
$operands =~ s/mem/memory/g;
$operands =~ s/memory_offs/mem_offs/g;
$operands =~ s/imm(\d+)/imm|bits$1/g;
$operands =~ s/imm/immediate/g;
$operands =~ s/rm(\d+)/regmem|bits$1/g;
$num = 3;
$operands = '0,0,0', $num = 0 if $operands eq 'void';
$operands .= ',0', $num-- while $operands !~ /,.*,/;
$operands =~ tr/a-z/A-Z/;
# format the flags
$flags =~ s/,/|IF_/g;
$flags =~ s/(\|IF_ND|IF_ND\|)//, $nd = 1 if $flags =~ /IF_ND/;
$flags = "IF_" . $flags;
("{I_$opcode, $num, {$operands}, \"$codes\", $flags},", $nd);
}
# Here we determine the range of possible starting bytes for a given
# instruction. We need only consider the codes:
# \1 \2 \3 mean literal bytes, of course
# \4 \5 \6 \7 mean PUSH/POP of segment registers: special case
# \10 \11 \12 mean byte plus register value
# \17 means byte zero
# \330 means byte plus condition code
# \0 or \340 mean give up and return empty set
sub startbyte {
local ($codes) = @_;
local $word, @range;
while (1) {
die "couldn't get code in '$codes'" if $codes !~ /^(\\[^\\]+)(\\.*)?$/;
$word = $1, $codes = $2;
return (hex $1) if $word =~ /^\\[123]$/ && $codes =~ /^\\x(..)/;
return (0x07, 0x17, 0x1F) if $word eq "\\4";
return (0xA1, 0xA9) if $word eq "\\5";
return (0x06, 0x0E, 0x16, 0x1E) if $word eq "\\6";
return (0xA0, 0xA8) if $word eq "\\7";
$start=hex $1, $r=8, last if $word =~ /^\\1[012]$/ && $codes =~/^\\x(..)/;
return (0) if $word eq "\\17";
$start=hex $1, $r=16, last if $word =~ /^\\330$/ && $codes =~ /^\\x(..)/;
return () if $word eq "\\0" || $word eq "\\340";
}
@range = ();
push @range, $start++ while ($r-- > 0);
@range;
}
|
