317 lines
8.7 KiB
Perl
317 lines
8.7 KiB
Perl
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#!/usr/bin/perl
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my $bigend; # little/big endian
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my $nxstack;
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$nxstack = 0;
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eval 'exec /usr/local/bin/perl -S $0 ${1+"$@"}'
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if $running_under_some_shell;
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while ($ARGV[0] =~ /^-/) {
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$_ = shift;
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last if /^--/;
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if (/^-n/) {
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$nflag++;
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next;
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}
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die "I don't recognize this switch: $_\\n";
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}
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$printit++ unless $nflag;
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$\ = "\n"; # automatically add newline on print
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$n=0;
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$thumb = 0; # ARM mode by default, not Thumb.
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@proc_stack = ();
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LINE:
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while (<>) {
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# For ADRLs we need to add a new line after the substituted one.
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$addPadding = 0;
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# First, we do not dare to touch *anything* inside double quotes, do we?
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# Second, if you want a dollar character in the string,
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# insert two of them -- that's how ARM C and assembler treat strings.
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s/^([A-Za-z_]\w*)[ \t]+DCB[ \t]*\"/$1: .ascii \"/ && do { s/\$\$/\$/g; next };
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s/\bDCB\b[ \t]*\"/.ascii \"/ && do { s/\$\$/\$/g; next };
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s/^(\S+)\s+RN\s+(\S+)/$1 .req r$2/ && do { s/\$\$/\$/g; next };
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# If there's nothing on a line but a comment, don't try to apply any further
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# substitutions (this is a cheap hack to avoid mucking up the license header)
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s/^([ \t]*);/$1@/ && do { s/\$\$/\$/g; next };
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# If substituted -- leave immediately !
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s/@/,:/;
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s/;/@/;
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while ( /@.*'/ ) {
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s/(@.*)'/$1/g;
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}
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s/\{FALSE\}/0/g;
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s/\{TRUE\}/1/g;
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s/\{(\w\w\w\w+)\}/$1/g;
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s/\bINCLUDE[ \t]*([^ \t\n]+)/.include \"$1\"/;
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s/\bGET[ \t]*([^ \t\n]+)/.include \"${ my $x=$1; $x =~ s|\.s|-gnu.S|; \$x }\"/;
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s/\bIMPORT\b/.extern/;
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s/\bEXPORT\b/.global/;
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s/^(\s+)\[/$1IF/;
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s/^(\s+)\|/$1ELSE/;
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s/^(\s+)\]/$1ENDIF/;
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s/IF *:DEF:/ .ifdef/;
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s/IF *:LNOT: *:DEF:/ .ifndef/;
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s/ELSE/ .else/;
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s/ENDIF/ .endif/;
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if( /\bIF\b/ ) {
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s/\bIF\b/ .if/;
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s/=/==/;
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}
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if ( $n == 2) {
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s/\$/\\/g;
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}
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if ($n == 1) {
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s/\$//g;
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s/label//g;
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$n = 2;
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}
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if ( /MACRO/ ) {
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s/MACRO *\n/.macro/;
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$n=1;
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}
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if ( /\bMEND\b/ ) {
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s/\bMEND\b/.endm/;
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$n=0;
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}
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# ".rdata" doesn't work in 'as' version 2.13.2, as it is ".rodata" there.
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#
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if ( /\bAREA\b/ ) {
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my $align;
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$align = "2";
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if ( /ALIGN=(\d+)/ ) {
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$align = $1;
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}
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if ( /CODE/ ) {
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$nxstack = 1;
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}
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s/^(.+)CODE(.+)READONLY(.*)/ .text/;
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s/^(.+)DATA(.+)READONLY(.*)/ .section .rdata/;
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s/^(.+)\|\|\.data\|\|(.+)/ .data/;
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s/^(.+)\|\|\.bss\|\|(.+)/ .bss/;
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s/$/; .p2align $align/;
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# Enable NEON instructions but don't produce a binary that requires
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# ARMv7. RVCT does not have equivalent directives, so we just do this
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# for all CODE areas.
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if ( /.text/ ) {
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# Separating .arch, .fpu, etc., by semicolons does not work (gas
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# thinks the semicolon is part of the arch name, even when there's
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# whitespace separating them). Sadly this means our line numbers
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# won't match the original source file (we could use the .line
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# directive, which is documented to be obsolete, but then gdb will
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# show the wrong line in the translated source file).
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s/$/; .arch armv7-a\n .fpu neon\n .object_arch armv4t/;
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}
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}
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s/\|\|\.constdata\$(\d+)\|\|/.L_CONST$1/; # ||.constdata$3||
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s/\|\|\.bss\$(\d+)\|\|/.L_BSS$1/; # ||.bss$2||
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s/\|\|\.data\$(\d+)\|\|/.L_DATA$1/; # ||.data$2||
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s/\|\|([a-zA-Z0-9_]+)\@([a-zA-Z0-9_]+)\|\|/@ $&/;
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s/^(\s+)\%(\s)/ .space $1/;
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s/\|(.+)\.(\d+)\|/\.$1_$2/; # |L80.123| -> .L80_123
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s/\bCODE32\b/.code 32/ && do {$thumb = 0};
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s/\bCODE16\b/.code 16/ && do {$thumb = 1};
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if (/\bPROC\b/)
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{
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my $prefix;
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my $proc;
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/^([A-Za-z_\.]\w+)\b/;
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$proc = $1;
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$prefix = "";
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if ($proc)
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{
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$prefix = $prefix.sprintf("\t.type\t%s, %%function; ",$proc);
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push(@proc_stack, $proc);
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s/^[A-Za-z_\.]\w+/$&:/;
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}
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$prefix = $prefix."\t.thumb_func; " if ($thumb);
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s/\bPROC\b/@ $&/;
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$_ = $prefix.$_;
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}
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s/^(\s*)(S|Q|SH|U|UQ|UH)ASX\b/$1$2ADDSUBX/;
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s/^(\s*)(S|Q|SH|U|UQ|UH)SAX\b/$1$2SUBADDX/;
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if (/\bENDP\b/)
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{
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my $proc;
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s/\bENDP\b/@ $&/;
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$proc = pop(@proc_stack);
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$_ = "\t.size $proc, .-$proc".$_ if ($proc);
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}
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s/\bSUBT\b/@ $&/;
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s/\bDATA\b/@ $&/; # DATA directive is deprecated -- Asm guide, p.7-25
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s/\bKEEP\b/@ $&/;
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s/\bEXPORTAS\b/@ $&/;
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s/\|\|(.)+\bEQU\b/@ $&/;
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s/\|\|([\w\$]+)\|\|/$1/;
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s/\bENTRY\b/@ $&/;
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s/\bASSERT\b/@ $&/;
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s/\bGBLL\b/@ $&/;
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s/\bGBLA\b/@ $&/;
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s/^\W+OPT\b/@ $&/;
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s/:OR:/|/g;
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s/:SHL:/<</g;
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s/:SHR:/>>/g;
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s/:AND:/&/g;
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s/:LAND:/&&/g;
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s/CPSR/cpsr/;
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s/SPSR/spsr/;
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s/ALIGN$/.balign 4/;
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s/ALIGN\s+([0-9x]+)$/.balign $1/;
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s/psr_cxsf/psr_all/;
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s/LTORG/.ltorg/;
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s/^([A-Za-z_]\w*)[ \t]+EQU/ .set $1,/;
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s/^([A-Za-z_]\w*)[ \t]+SETL/ .set $1,/;
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s/^([A-Za-z_]\w*)[ \t]+SETA/ .set $1,/;
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s/^([A-Za-z_]\w*)[ \t]+\*/ .set $1,/;
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# {PC} + 0xdeadfeed --> . + 0xdeadfeed
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s/\{PC\} \+/ \. +/;
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# Single hex constant on the line !
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#
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# >>> NOTE <<<
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# Double-precision floats in gcc are always mixed-endian, which means
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# bytes in two words are little-endian, but words are big-endian.
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# So, 0x0000deadfeed0000 would be stored as 0x0000dead at low address
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# and 0xfeed0000 at high address.
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#
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s/\bDCFD\b[ \t]+0x([a-fA-F0-9]{8})([a-fA-F0-9]{8})/.long 0x$1, 0x$2/;
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# Only decimal constants on the line, no hex !
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s/\bDCFD\b[ \t]+([0-9\.\-]+)/.double $1/;
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# Single hex constant on the line !
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# s/\bDCFS\b[ \t]+0x([a-f0-9]{8})([a-f0-9]{8})/.long 0x$1, 0x$2/;
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# Only decimal constants on the line, no hex !
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# s/\bDCFS\b[ \t]+([0-9\.\-]+)/.double $1/;
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s/\bDCFS[ \t]+0x/.word 0x/;
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s/\bDCFS\b/.float/;
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s/^([A-Za-z_]\w*)[ \t]+DCD/$1 .word/;
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s/\bDCD\b/.word/;
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s/^([A-Za-z_]\w*)[ \t]+DCW/$1 .short/;
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s/\bDCW\b/.short/;
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s/^([A-Za-z_]\w*)[ \t]+DCB/$1 .byte/;
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s/\bDCB\b/.byte/;
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s/^([A-Za-z_]\w*)[ \t]+\%/.comm $1,/;
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s/^[A-Za-z_\.]\w+/$&:/;
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s/^(\d+)/$1:/;
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s/\%(\d+)/$1b_or_f/;
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s/\%[Bb](\d+)/$1b/;
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s/\%[Ff](\d+)/$1f/;
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s/\%[Ff][Tt](\d+)/$1f/;
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s/&([\dA-Fa-f]+)/0x$1/;
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if ( /\b2_[01]+\b/ ) {
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s/\b2_([01]+)\b/conv$1&&&&/g;
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while ( /[01][01][01][01]&&&&/ ) {
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s/0000&&&&/&&&&0/g;
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s/0001&&&&/&&&&1/g;
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s/0010&&&&/&&&&2/g;
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s/0011&&&&/&&&&3/g;
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s/0100&&&&/&&&&4/g;
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s/0101&&&&/&&&&5/g;
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s/0110&&&&/&&&&6/g;
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s/0111&&&&/&&&&7/g;
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s/1000&&&&/&&&&8/g;
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s/1001&&&&/&&&&9/g;
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s/1010&&&&/&&&&A/g;
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s/1011&&&&/&&&&B/g;
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s/1100&&&&/&&&&C/g;
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s/1101&&&&/&&&&D/g;
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s/1110&&&&/&&&&E/g;
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s/1111&&&&/&&&&F/g;
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}
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s/000&&&&/&&&&0/g;
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s/001&&&&/&&&&1/g;
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s/010&&&&/&&&&2/g;
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s/011&&&&/&&&&3/g;
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s/100&&&&/&&&&4/g;
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s/101&&&&/&&&&5/g;
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s/110&&&&/&&&&6/g;
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s/111&&&&/&&&&7/g;
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s/00&&&&/&&&&0/g;
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s/01&&&&/&&&&1/g;
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s/10&&&&/&&&&2/g;
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s/11&&&&/&&&&3/g;
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s/0&&&&/&&&&0/g;
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s/1&&&&/&&&&1/g;
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s/conv&&&&/0x/g;
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}
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if ( /commandline/)
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{
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if( /-bigend/)
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{
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$bigend=1;
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}
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}
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if ( /\bDCDU\b/ )
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{
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my $cmd=$_;
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my $value;
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my $prefix;
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my $w1;
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my $w2;
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my $w3;
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my $w4;
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s/\s+DCDU\b/@ $&/;
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$cmd =~ /\bDCDU\b\s+0x(\d+)/;
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$value = $1;
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$value =~ /(\w\w)(\w\w)(\w\w)(\w\w)/;
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$w1 = $1;
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$w2 = $2;
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$w3 = $3;
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$w4 = $4;
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if( $bigend ne "")
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{
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# big endian
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$prefix = "\t.byte\t0x".$w1.";".
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"\t.byte\t0x".$w2.";".
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"\t.byte\t0x".$w3.";".
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"\t.byte\t0x".$w4."; ";
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}
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else
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{
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# little endian
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$prefix = "\t.byte\t0x".$w4.";".
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"\t.byte\t0x".$w3.";".
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"\t.byte\t0x".$w2.";".
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"\t.byte\t0x".$w1."; ";
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}
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$_=$prefix.$_;
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}
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if ( /\badrl\b/i )
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{
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s/\badrl\s+(\w+)\s*,\s*(\w+)/ldr $1,=$2/i;
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$addPadding = 1;
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}
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s/\bEND\b/@ END/;
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} continue {
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printf ("%s", $_) if $printit;
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if ($addPadding != 0)
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{
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printf (" mov r0,r0\n");
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$addPadding = 0;
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}
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}
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#If we had a code section, mark that this object doesn't need an executable
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# stack.
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if ($nxstack) {
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printf (" .section\t.note.GNU-stack,\"\",\%\%progbits\n");
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}
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