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
|
#!/usr/bin/env perl
##
## Copyright (c) 2010 The WebM project authors. All Rights Reserved.
##
## Use of this source code is governed by a BSD-style license
## that can be found in the LICENSE file in the root of the source
## tree. An additional intellectual property rights grant can be found
## in the file PATENTS. All contributing project authors may
## be found in the AUTHORS file in the root of the source tree.
##
# ads2gas.pl
# Author: Eric Fung (efung (at) acm.org)
#
# Convert ARM Developer Suite 1.0.1 syntax assembly source to GNU as format
#
# Usage: cat inputfile | perl ads2gas.pl > outputfile
#
use FindBin;
use lib $FindBin::Bin;
use thumb;
my $thumb = 0;
my $elf = 1;
foreach my $arg (@ARGV) {
$thumb = 1 if ($arg eq "-thumb");
$elf = 0 if ($arg eq "-noelf");
}
print "@ This file was created from a .asm file\n";
print "@ using the ads2gas.pl script.\n";
print "\t.equ DO1STROUNDING, 0\n";
print "\t.syntax unified\n";
if ($thumb) {
print "\t.thumb\n";
}
# Stack of procedure names.
@proc_stack = ();
while (<STDIN>)
{
undef $comment;
undef $line;
$comment_char = ";";
$comment_sub = "@";
# Handle comments.
if (/$comment_char/)
{
$comment = "";
($line, $comment) = /(.*?)$comment_char(.*)/;
$_ = $line;
}
# Load and store alignment
s/@/,:/g;
# Hexadecimal constants prefaced by 0x
s/#&/#0x/g;
# Convert :OR: to |
s/:OR:/ | /g;
# Convert :AND: to &
s/:AND:/ & /g;
# Convert :NOT: to ~
s/:NOT:/ ~ /g;
# Convert :SHL: to <<
s/:SHL:/ << /g;
# Convert :SHR: to >>
s/:SHR:/ >> /g;
# Convert ELSE to .else
s/\bELSE\b/.else/g;
# Convert ENDIF to .endif
s/\bENDIF\b/.endif/g;
# Convert ELSEIF to .elseif
s/\bELSEIF\b/.elseif/g;
# Convert LTORG to .ltorg
s/\bLTORG\b/.ltorg/g;
# Convert endfunc to nothing.
s/\bendfunc\b//ig;
# Convert FUNCTION to nothing.
s/\bFUNCTION\b//g;
s/\bfunction\b//g;
s/\bENTRY\b//g;
s/\bMSARMASM\b/0/g;
s/^\s+end\s+$//g;
# Convert IF :DEF:to .if
# gcc doesn't have the ability to do a conditional
# if defined variable that is set by IF :DEF: on
# armasm, so convert it to a normal .if and then
# make sure to define a value elesewhere
if (s/\bIF :DEF:\b/.if /g)
{
s/=/==/g;
}
# Convert IF to .if
if (s/\bIF\b/.if/g)
{
s/=+/==/g;
}
# Convert INCLUDE to .INCLUDE "file"
s/INCLUDE(\s*)(.*)$/.include $1\"$2\"/;
# Code directive (ARM vs Thumb)
s/CODE([0-9][0-9])/.code $1/;
# No AREA required
# But ALIGNs in AREA must be obeyed
s/^\s*AREA.*ALIGN=([0-9])$/.text\n.p2align $1/;
# If no ALIGN, strip the AREA and align to 4 bytes
s/^\s*AREA.*$/.text\n.p2align 2/;
# DCD to .word
# This one is for incoming symbols
s/DCD\s+\|(\w*)\|/.long $1/;
# DCW to .short
s/DCW\s+\|(\w*)\|/.short $1/;
s/DCW(.*)/.short $1/;
# Constants defined in scope
s/DCD(.*)/.long $1/;
s/DCB(.*)/.byte $1/;
# Make function visible to linker, and make additional symbol with
# prepended underscore
if ($elf) {
s/EXPORT\s+\|([\$\w]*)\|/.global $1 \n\t.type $1, function/;
} else {
s/EXPORT\s+\|([\$\w]*)\|/.global $1/;
}
s/IMPORT\s+\|([\$\w]*)\|/.global $1/;
s/EXPORT\s+([\$\w]*)/.global $1/;
s/export\s+([\$\w]*)/.global $1/;
# No vertical bars required; make additional symbol with prepended
# underscore
s/^\|(\$?\w+)\|/_$1\n\t$1:/g;
# Labels need trailing colon
# s/^(\w+)/$1:/ if !/EQU/;
# put the colon at the end of the line in the macro
s/^([a-zA-Z_0-9\$]+)/$1:/ if !/EQU/;
# ALIGN directive
s/\bALIGN\b/.balign/g;
if ($thumb) {
# ARM code - we force everything to thumb with the declaration in the header
s/\sARM//g;
} else {
# ARM code
s/\sARM/.arm/g;
}
# push/pop
s/(push\s+)(r\d+)/stmdb sp\!, \{$2\}/g;
s/(pop\s+)(r\d+)/ldmia sp\!, \{$2\}/g;
# NEON code
s/(vld1.\d+\s+)(q\d+)/$1\{$2\}/g;
s/(vtbl.\d+\s+[^,]+),([^,]+)/$1,\{$2\}/g;
if ($thumb) {
thumb::FixThumbInstructions($_, 0);
}
# eabi_attributes numerical equivalents can be found in the
# "ARM IHI 0045C" document.
if ($elf) {
# REQUIRE8 Stack is required to be 8-byte aligned
s/\sREQUIRE8/.eabi_attribute 24, 1 \@Tag_ABI_align_needed/g;
# PRESERVE8 Stack 8-byte align is preserved
s/\sPRESERVE8/.eabi_attribute 25, 1 \@Tag_ABI_align_preserved/g;
} else {
s/\sREQUIRE8//;
s/\sPRESERVE8//;
}
# Use PROC and ENDP to give the symbols a .size directive.
# This makes them show up properly in debugging tools like gdb and valgrind.
if (/\bPROC\b/)
{
my $proc;
/^_([\.0-9A-Z_a-z]\w+)\b/;
$proc = $1;
push(@proc_stack, $proc) if ($proc);
s/\bPROC\b/@ $&/;
}
if (/\bENDP\b/)
{
my $proc;
s/\bENDP\b/@ $&/;
$proc = pop(@proc_stack);
$_ = "\t.size $proc, .-$proc".$_ if ($proc and $elf);
}
# EQU directive
s/(\S+\s+)EQU(\s+\S+)/.equ $1, $2/;
# Begin macro definition
if (/\bMACRO\b/) {
$_ = <STDIN>;
s/^/.macro/;
s/\$//g; # remove formal param reference
s/;/@/g; # change comment characters
}
# For macros, use \ to reference formal params
s/\$/\\/g; # End macro definition
s/\bMEND\b/.endm/; # No need to tell it where to stop assembling
next if /^\s*END\s*$/;
print;
print "$comment_sub$comment\n" if defined $comment;
}
# Mark that this object doesn't need an executable stack.
printf ("\t.section\t.note.GNU-stack,\"\",\%\%progbits\n") if $elf;
|
