--- /dev/null
+#!/usr/bin/env perl
+# by David Conrad
+# This code is licensed under GPLv2 or later; go to gnu.org to read it
+# (not that it much matters for an asm preprocessor)
+# usage: set your assembler to be something like "perl gas-preprocessor.pl gcc"
+use strict;
+
+# Apple's gas is ancient and doesn't support modern preprocessing features like
+# .rept and has ugly macro syntax, among other things. Thus, this script
+# implements the subset of the gas preprocessor used by x264 and ffmpeg
+# that isn't supported by Apple's gas.
+
+my @gcc_cmd = @ARGV;
+my @preprocess_c_cmd;
+
+my $fix_unreq = $^O eq "darwin";
+
+if ($gcc_cmd[0] eq "-fix-unreq") {
+ $fix_unreq = 1;
+ shift @gcc_cmd;
+} elsif ($gcc_cmd[0] eq "-no-fix-unreq") {
+ $fix_unreq = 0;
+ shift @gcc_cmd;
+}
+
+if (grep /\.c$/, @gcc_cmd) {
+ # C file (inline asm?) - compile
+ @preprocess_c_cmd = (@gcc_cmd, "-S");
+} elsif (grep /\.[sS]$/, @gcc_cmd) {
+ # asm file, just do C preprocessor
+ @preprocess_c_cmd = (@gcc_cmd, "-E");
+} else {
+ die "Unrecognized input filetype";
+}
+
+# if compiling, avoid creating an output file named '-.o'
+if ((grep /^-c$/, @gcc_cmd) && !(grep /^-o/, @gcc_cmd)) {
+ foreach my $i (@gcc_cmd) {
+ if ($i =~ /\.[csS]$/) {
+ my $outputfile = $i;
+ $outputfile =~ s/\.[csS]$/.o/;
+ push(@gcc_cmd, "-o");
+ push(@gcc_cmd, $outputfile);
+ last;
+ }
+ }
+}
+@gcc_cmd = map { /\.[csS]$/ ? qw(-x assembler -) : $_ } @gcc_cmd;
+@preprocess_c_cmd = map { /\.o$/ ? "-" : $_ } @preprocess_c_cmd;
+
+my $comm;
+
+# detect architecture from gcc binary name
+if ($gcc_cmd[0] =~ /arm/) {
+ $comm = '@';
+} elsif ($gcc_cmd[0] =~ /powerpc|ppc/) {
+ $comm = '#';
+}
+
+# look for -arch flag
+foreach my $i (1 .. $#gcc_cmd-1) {
+ if ($gcc_cmd[$i] eq "-arch") {
+ if ($gcc_cmd[$i+1] =~ /arm/) {
+ $comm = '@';
+ } elsif ($gcc_cmd[$i+1] =~ /powerpc|ppc/) {
+ $comm = '#';
+ }
+ }
+}
+
+# assume we're not cross-compiling if no -arch or the binary doesn't have the arch name
+if (!$comm) {
+ my $native_arch = qx/arch/;
+ if ($native_arch =~ /arm/) {
+ $comm = '@';
+ } elsif ($native_arch =~ /powerpc|ppc/) {
+ $comm = '#';
+ }
+}
+
+if (!$comm) {
+ die "Unable to identify target architecture";
+}
+
+my %ppc_spr = (ctr => 9,
+ vrsave => 256);
+
+open(ASMFILE, "-|", @preprocess_c_cmd) || die "Error running preprocessor";
+
+my $current_macro = '';
+my $macro_level = 0;
+my %macro_lines;
+my %macro_args;
+my %macro_args_default;
+my $macro_count = 0;
+my $altmacro = 0;
+
+my @pass1_lines;
+my @ifstack;
+
+my %symbols;
+
+# pass 1: parse .macro
+# note that the handling of arguments is probably overly permissive vs. gas
+# but it should be the same for valid cases
+while (<ASMFILE>) {
+ # remove all comments (to avoid interfering with evaluating directives)
+ s/(?<!\\)$comm.*//x;
+
+ # comment out unsupported directives
+ s/\.type/$comm.type/x;
+ s/\.func/$comm.func/x;
+ s/\.endfunc/$comm.endfunc/x;
+ s/\.ltorg/$comm.ltorg/x;
+ s/\.size/$comm.size/x;
+ s/\.fpu/$comm.fpu/x;
+ s/\.arch/$comm.arch/x;
+ s/\.object_arch/$comm.object_arch/x;
+
+ # the syntax for these is a little different
+ s/\.global/.globl/x;
+ # also catch .section .rodata since the equivalent to .const_data is .section __DATA,__const
+ s/(.*)\.rodata/.const_data/x;
+ s/\.int/.long/x;
+ s/\.float/.single/x;
+
+ # catch unknown section names that aren't mach-o style (with a comma)
+ if (/.section ([^,]*)$/) {
+ die ".section $1 unsupported; figure out the mach-o section name and add it";
+ }
+
+ parse_line($_);
+}
+
+sub eval_expr {
+ my $expr = $_[0];
+ $expr =~ s/([A-Za-z._][A-Za-z0-9._]*)/$symbols{$1}/g;
+ eval $expr;
+}
+
+sub handle_if {
+ my $line = $_[0];
+ # handle .if directives; apple's assembler doesn't support important non-basic ones
+ # evaluating them is also needed to handle recursive macros
+ if ($line =~ /\.if(n?)([a-z]*)\s+(.*)/) {
+ my $result = $1 eq "n";
+ my $type = $2;
+ my $expr = $3;
+
+ if ($type eq "b") {
+ $expr =~ s/\s//g;
+ $result ^= $expr eq "";
+ } elsif ($type eq "c") {
+ if ($expr =~ /(.*)\s*,\s*(.*)/) {
+ $result ^= $1 eq $2;
+ } else {
+ die "argument to .ifc not recognized";
+ }
+ } elsif ($type eq "") {
+ $result ^= eval_expr($expr) != 0;
+ } elsif ($type eq "eq") {
+ $result = eval_expr($expr) == 0;
+ } elsif ($type eq "lt") {
+ $result = eval_expr($expr) < 0;
+ } else {
+ chomp($line);
+ die "unhandled .if varient. \"$line\"";
+ }
+ push (@ifstack, $result);
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+sub parse_line {
+ my $line = @_[0];
+
+ # evaluate .if blocks
+ if (scalar(@ifstack)) {
+ if (/\.endif/) {
+ pop(@ifstack);
+ return;
+ } elsif ($line =~ /\.elseif\s+(.*)/) {
+ if ($ifstack[-1] == 0) {
+ $ifstack[-1] = !!eval_expr($1);
+ } elsif ($ifstack[-1] > 0) {
+ $ifstack[-1] = -$ifstack[-1];
+ }
+ return;
+ } elsif (/\.else/) {
+ $ifstack[-1] = !$ifstack[-1];
+ return;
+ } elsif (handle_if($line)) {
+ return;
+ }
+
+ # discard lines in false .if blocks
+ foreach my $i (0 .. $#ifstack) {
+ if ($ifstack[$i] <= 0) {
+ return;
+ }
+ }
+ }
+
+ if (/\.macro/) {
+ $macro_level++;
+ if ($macro_level > 1 && !$current_macro) {
+ die "nested macros but we don't have master macro";
+ }
+ } elsif (/\.endm/) {
+ $macro_level--;
+ if ($macro_level < 0) {
+ die "unmatched .endm";
+ } elsif ($macro_level == 0) {
+ $current_macro = '';
+ return;
+ }
+ }
+
+ if ($macro_level > 1) {
+ push(@{$macro_lines{$current_macro}}, $line);
+ } elsif ($macro_level == 0) {
+ expand_macros($line);
+ } else {
+ if ($line =~ /\.macro\s+([\d\w\.]+)\s*(.*)/) {
+ $current_macro = $1;
+
+ # commas in the argument list are optional, so only use whitespace as the separator
+ my $arglist = $2;
+ $arglist =~ s/,/ /g;
+
+ my @args = split(/\s+/, $arglist);
+ foreach my $i (0 .. $#args) {
+ my @argpair = split(/=/, $args[$i]);
+ $macro_args{$current_macro}[$i] = $argpair[0];
+ $argpair[0] =~ s/:vararg$//;
+ $macro_args_default{$current_macro}{$argpair[0]} = $argpair[1];
+ }
+ # ensure %macro_lines has the macro name added as a key
+ $macro_lines{$current_macro} = [];
+
+ } elsif ($current_macro) {
+ push(@{$macro_lines{$current_macro}}, $line);
+ } else {
+ die "macro level without a macro name";
+ }
+ }
+}
+
+sub expand_macros {
+ my $line = @_[0];
+
+ # handle .if directives; apple's assembler doesn't support important non-basic ones
+ # evaluating them is also needed to handle recursive macros
+ if (handle_if($line)) {
+ return;
+ }
+
+ if (/\.purgem\s+([\d\w\.]+)/) {
+ delete $macro_lines{$1};
+ delete $macro_args{$1};
+ delete $macro_args_default{$1};
+ return;
+ }
+
+ if ($line =~ /\.altmacro/) {
+ $altmacro = 1;
+ return;
+ }
+
+ if ($line =~ /\.noaltmacro/) {
+ $altmacro = 0;
+ return;
+ }
+
+ $line =~ s/\%([^,]*)/eval_expr($1)/eg if $altmacro;
+
+ if ($line =~ /\.set\s+(.*),\s*(.*)/) {
+ $symbols{$1} = eval_expr($2);
+ }
+
+ if ($line =~ /(\S+:|)\s*([\w\d\.]+)\s*(.*)/ && exists $macro_lines{$2}) {
+ push(@pass1_lines, $1);
+ my $macro = $2;
+
+ # commas are optional here too, but are syntactically important because
+ # parameters can be blank
+ my @arglist = split(/,/, $3);
+ my @args;
+ my @args_seperator;
+
+ my $comma_sep_required = 0;
+ foreach (@arglist) {
+ # allow arithmetic/shift operators in macro arguments
+ $_ =~ s/\s*(\+|-|\*|\/|<<|>>)\s*/$1/g;
+
+ my @whitespace_split = split(/\s+/, $_);
+ if (!@whitespace_split) {
+ push(@args, '');
+ push(@args_seperator, '');
+ } else {
+ foreach (@whitespace_split) {
+ #print ("arglist = \"$_\"\n");
+ if (length($_)) {
+ push(@args, $_);
+ my $sep = $comma_sep_required ? "," : " ";
+ push(@args_seperator, $sep);
+ #print ("sep = \"$sep\", arg = \"$_\"\n");
+ $comma_sep_required = 0;
+ }
+ }
+ }
+
+ $comma_sep_required = 1;
+ }
+
+ my %replacements;
+ if ($macro_args_default{$macro}){
+ %replacements = %{$macro_args_default{$macro}};
+ }
+
+ # construct hashtable of text to replace
+ foreach my $i (0 .. $#args) {
+ my $argname = $macro_args{$macro}[$i];
+ my @macro_args = @{ $macro_args{$macro} };
+ if ($args[$i] =~ m/=/) {
+ # arg=val references the argument name
+ # XXX: I'm not sure what the expected behaviour if a lot of
+ # these are mixed with unnamed args
+ my @named_arg = split(/=/, $args[$i]);
+ $replacements{$named_arg[0]} = $named_arg[1];
+ } elsif ($i > $#{$macro_args{$macro}}) {
+ # more args given than the macro has named args
+ # XXX: is vararg allowed on arguments before the last?
+ $argname = $macro_args{$macro}[-1];
+ if ($argname =~ s/:vararg$//) {
+ #print "macro = $macro, args[$i] = $args[$i], args_seperator=@args_seperator, argname = $argname, arglist[$i] = $arglist[$i], arglist = @arglist, args=@args, macro_args=@macro_args\n";
+ #$replacements{$argname} .= ", $args[$i]";
+ $replacements{$argname} .= "$args_seperator[$i] $args[$i]";
+ } else {
+ die "Too many arguments to macro $macro";
+ }
+ } else {
+ $argname =~ s/:vararg$//;
+ $replacements{$argname} = $args[$i];
+ }
+ }
+
+ my $count = $macro_count++;
+
+ # apply replacements as regex
+ foreach (@{$macro_lines{$macro}}) {
+ my $macro_line = $_;
+ # do replacements by longest first, this avoids wrong replacement
+ # when argument names are subsets of each other
+ foreach (reverse sort {length $a <=> length $b} keys %replacements) {
+ $macro_line =~ s/\\$_/$replacements{$_}/g;
+ }
+ $macro_line =~ s/\\\@/$count/g;
+ $macro_line =~ s/\\\(\)//g; # remove \()
+ parse_line($macro_line);
+ }
+ } else {
+ push(@pass1_lines, $line);
+ }
+}
+
+close(ASMFILE) or exit 1;
+open(ASMFILE, "|-", @gcc_cmd) or die "Error running assembler";
+#open(ASMFILE, ">/tmp/a.S") or die "Error running assembler";
+
+my @sections;
+my $num_repts;
+my $rept_lines;
+
+my %literal_labels; # for ldr <reg>, =<expr>
+my $literal_num = 0;
+
+my $thumb = 0;
+
+my %thumb_labels;
+my %call_targets;
+
+my $in_irp = 0;
+my @irp_args;
+my $irp_param;
+
+# pass 2: parse .rept and .if variants
+# NOTE: since we don't implement a proper parser, using .rept with a
+# variable assigned from .set is not supported
+foreach my $line (@pass1_lines) {
+ # handle .previous (only with regard to .section not .subsection)
+ if ($line =~ /\.(section|text|const_data)/) {
+ push(@sections, $line);
+ } elsif ($line =~ /\.previous/) {
+ if (!$sections[-2]) {
+ die ".previous without a previous section";
+ }
+ $line = $sections[-2];
+ push(@sections, $line);
+ }
+
+ $thumb = 1 if $line =~ /\.code\s+16|\.thumb/;
+ $thumb = 0 if $line =~ /\.code\s+32|\.arm/;
+
+ # handle ldr <reg>, =<expr>
+ if ($line =~ /(.*)\s*ldr([\w\s\d]+)\s*,\s*=(.*)/) {
+ my $label = $literal_labels{$3};
+ if (!$label) {
+ $label = "Literal_$literal_num";
+ $literal_num++;
+ $literal_labels{$3} = $label;
+ }
+ $line = "$1 ldr$2, $label\n";
+ } elsif ($line =~ /\.ltorg/) {
+ $line .= ".align 2\n";
+ foreach my $literal (keys %literal_labels) {
+ $line .= "$literal_labels{$literal}:\n .word $literal\n";
+ }
+ %literal_labels = ();
+ }
+
+ # thumb add with large immediate needs explicit add.w
+ if ($thumb and $line =~ /add\s+.*#([^@]+)/) {
+ $line =~ s/add/add.w/ if eval_expr($1) > 255;
+ }
+
+ # mach-o local symbol names start with L (no dot)
+ $line =~ s/(?<!\w)\.(L\w+)/$1/g;
+
+ if ($thumb and $line =~ /^\s*(\w+)\s*:/) {
+ $thumb_labels{$1}++;
+ }
+
+ if ($line =~ /^\s*((\w+:)?blx?|\.globl)\s+(\w+)/) {
+ $call_targets{$3}++;
+ }
+
+ # @l -> lo16() @ha -> ha16()
+ $line =~ s/,\s+([^,]+)\@l\b/, lo16($1)/g;
+ $line =~ s/,\s+([^,]+)\@ha\b/, ha16($1)/g;
+
+ # move to/from SPR
+ if ($line =~ /(\s+)(m[ft])([a-z]+)\s+(\w+)/ and exists $ppc_spr{$3}) {
+ if ($2 eq 'mt') {
+ $line = "$1${2}spr $ppc_spr{$3}, $4\n";
+ } else {
+ $line = "$1${2}spr $4, $ppc_spr{$3}\n";
+ }
+ }
+
+ # old gas versions store upper and lower case names on .req,
+ # but they remove only one on .unreq
+ if ($fix_unreq) {
+ if ($line =~ /\.unreq\s+(.*)/) {
+ $line = ".unreq " . lc($1) . "\n";
+ print ASMFILE ".unreq " . uc($1) . "\n";
+ }
+ }
+
+ if ($line =~ /\.rept\s+(.*)/) {
+ $num_repts = $1;
+ $rept_lines = "\n";
+
+ # handle the possibility of repeating another directive on the same line
+ # .endr on the same line is not valid, I don't know if a non-directive is
+ if ($num_repts =~ s/(\.\w+.*)//) {
+ $rept_lines .= "$1\n";
+ }
+ $num_repts = eval($num_repts);
+ } elsif ($line =~ /\.irp\s+([\d\w\.]+)\s*(.*)/) {
+ $in_irp = 1;
+ $num_repts = 1;
+ $rept_lines = "\n";
+ $irp_param = $1;
+
+ # only use whitespace as the separator
+ my $irp_arglist = $2;
+ $irp_arglist =~ s/,/ /g;
+ $irp_arglist =~ s/^\s+//;
+ @irp_args = split(/\s+/, $irp_arglist);
+ } elsif ($line =~ /\.irpc\s+([\d\w\.]+)\s*(.*)/) {
+ $in_irp = 1;
+ $num_repts = 1;
+ $rept_lines = "\n";
+ $irp_param = $1;
+
+ my $irp_arglist = $2;
+ $irp_arglist =~ s/,/ /g;
+ $irp_arglist =~ s/^\s+//;
+ @irp_args = split(//, $irp_arglist);
+ } elsif ($line =~ /\.endr/) {
+ if ($in_irp != 0) {
+ foreach my $i (@irp_args) {
+ my $line = $rept_lines;
+ $line =~ s/\\$irp_param/$i/g;
+ $line =~ s/\\\(\)//g; # remove \()
+ print ASMFILE $line;
+ }
+ } else {
+ for (1 .. $num_repts) {
+ print ASMFILE $rept_lines;
+ }
+ }
+ $rept_lines = '';
+ $in_irp = 0;
+ @irp_args = '';
+ } elsif ($rept_lines) {
+ $rept_lines .= $line;
+ } else {
+ print ASMFILE $line;
+ }
+}
+
+print ASMFILE ".text\n";
+print ASMFILE ".align 2\n";
+foreach my $literal (keys %literal_labels) {
+ print ASMFILE "$literal_labels{$literal}:\n .word $literal\n";
+}
+
+map print(ASMFILE ".thumb_func $_\n"),
+ grep exists $thumb_labels{$_}, keys %call_targets;
+
+close(ASMFILE) or exit 1;
+#exit 1
notaz.gp2x.de / pcsx_rearmed.git / commitdiff