mirror of
https://github.com/libretro/RetroArch
synced 2024-12-29 12:31:05 +00:00
528 lines
15 KiB
Perl
Executable File
528 lines
15 KiB
Perl
Executable File
#!/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/\.bss/.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
|