clear screen of serial console on startup, parse atags, pick default 0x100 location...

[AROS.git] / tools / sfdc / StubMOS.pl

### Class StubMOS: Create a MorphOS stub file #################################

BEGIN {
    package StubMOS;
    use vars qw(@ISA);
    @ISA = qw( Stub );

    sub new {
        my $proto  = shift;
        my $class  = ref($proto) || $proto;
        my $self   = $class->SUPER::new( @_ );
        bless ($self, $class);
        return $self;
    }

    sub header {
        my $self = shift;
        
        $self->SUPER::header (@_);

        print "\n";
        print "#include <emul/emulregs.h>\n";
        print "#include <stdarg.h>\n";
        print "\n";
    }

    sub function_proto {
        my $self      = shift;
        my %params    = @_;
        my $prototype = $params{'prototype'};

        if ($prototype->{type} eq 'varargs') {

            if ($prototype->{subtype} ne 'tagcall') {
                # We have to add the attribute to ourself first
            
                $self->special_function_proto (@_);
                print " __attribute__((varargs68k));\n";
                print "\n";
                $self->special_function_proto (@_);
            }
        }
        else {
            $self->SUPER::function_proto (@_);
        }
    }
    
    sub function_start {
        my $self      = shift;
        my %params    = @_;
        my $prototype = $params{'prototype'};
        my $sfd       = $self->{SFD};

        if ($prototype->{type} eq 'function') {
            print "\n";
            print "{\n";

            if (!$prototype->{nb}) {
                print "  BASE_EXT_DECL\n";
            }
        }
        elsif ($prototype->{type} eq 'varargs') {
            if ($prototype->{subtype} ne 'tagcall') {
                my $na;

                if ($prototype->{subtype} eq 'printfcall') {
                    $na = $prototype->{numargs} - 2;
                }
                else {
                    # methodcall: first vararg is removed
                    $na = $prototype->{numargs} - 3;
                }
                
                print "\n";
                print "{\n";
                print "  va_list _va;\n";
                print "  va_start (_va, $prototype->{___argnames}[$na]);\n";
                print "  return $$prototype{'real_funcname'}(BASE_PAR_NAME ";
            }
            else {
                # Shamelessly stolen from fd2inline ...
                
                # number of regs that contain varargs
                my $n = 9 - $prototype->{numregs};

                # add 4 bytes if that's an odd number, to avoid splitting a tag
                my $d = $n & 1 ? 4 : 0;

                # offset of the start of the taglist
                my $taglist = 8;

                # size of the stack frame
                my $local = ($taglist + $n * 4 + $d + 8 + 15) & ~15;

                #  Stack frame:
                #
                #   0 -  3: next frame ptr
                #   4 -  7: save lr
                #   8 -  8+n*4+d+8-1: tag list start
                #   ? - local-1: padding

                print  "__asm(\"\n";
                print  "        .align  2\n";
                print  "        .globl  $prototype->{funcname}\n";
                print  "        .type   $prototype->{funcname},\@function\n";
                print  "$prototype->{funcname}:\n";
                print  "        stwu    1,-$local(1)\n";
                print  "        mflr    0\n";
                printf "        stw     0,%d(1)\n", $local + 4;

                # If n is odd, one tag is split between regs and stack.
                # Copy its ti_Data together with the ti_Tag.
            
                if ($d != 0) {
                    # read ti_Data
                    printf "    lwz     0,%d(1)\n", $local + 8;
                }

                # Save the registers
            
                for my $count ($prototype->{numregs} .. 8) {
                    printf "    stw     %d,%d(1)\n",
                    $count + 2,
                    ($count - $prototype->{numregs}) * 4 + $taglist;
                }

                if ($d != 0) {
                    # write ti_Data
                    printf "    stw     0,%d(1)\n", $taglist + $n * 4;
                }

                # Add TAG_MORE

                print  "        li      11,2\n";
                printf "        addi    0,1,%d\n", $local + 8 + $d;
                printf "        stw     11,%d(1)\n", $taglist + $n * 4 + $d;
                printf "        stw     0,%d(1)\n", $taglist + $n * 4 + $d + 4;

                # vararg_reg = &saved regs
            
                printf "        addi    %d,1,%d\n",
                $prototype->{numregs} + 2, $taglist;
                print " bl      $prototype->{real_funcname}\n";
            }
        }
        else {
            $self->SUPER::function_start (@_);
        }
    }

    sub function_arg {
        my $self      = shift;
        my %params    = @_;
        my $prototype = $params{'prototype'};
        my $argtype   = $params{'argtype'};
        my $argname   = $params{'argname'};
        my $argreg    = $params{'argreg'};
        my $argnum    = $params{'argnum'};
        my $sfd       = $self->{SFD};

        if ($$prototype{'type'} eq 'function') {
            print "  REG_" . (uc $argreg) . " = (ULONG) $argname;\n";
        }
        elsif ($prototype->{type} eq 'varargs') {
            if ($prototype->{subtype} eq 'tagcall') {
#           if ($argnum < $prototype->{numargs} - 2) {
#               my $regoffset;
#
#               if ($argreg =~ /^d[0-9]$/) {
#                   ( $regoffset = $argreg ) =~ s/^d//;
#               }
#               elsif ($argreg =~ /^a[0-9]$/) {
#                   ( $regoffset = $argreg ) =~ s/^a//;
#                   $regoffset += 8;
#               }
#               else {
#                   die;
#               }
#
#               $regoffset *= 4;
#
#               # Save the non-varargs registers in the EmulHandle struct
#
#               printf "        stw     %d,%d(2)\n", $argnum + 3, $regoffset;
#           }
            }
            elsif ($prototype->{subtype} eq 'methodcall' &&
                   $argnum == $prototype->{numargs} - 2) {
                # Nuke it!
            }
            elsif ($argnum == $prototype->{numargs} - 1) {
                my $vt  = $$prototype{'argtypes'}[$$prototype{'numargs'} - 1];
                print ", ($vt) _va->overflow_arg_area";
            }
            else {
                $self->SUPER::function_arg (@_);
            }
        }
        else {
            $self->SUPER::function_arg (@_);
        }
    }
    
    sub function_end {
        my $self      = shift;
        my %params    = @_;
        my $prototype = $params{'prototype'};
        my $sfd       = $self->{SFD};

        
        if ($$prototype{'type'} eq 'function') {
            if (!$prototype->{nb}) {
                print "  REG_A6 = (ULONG) BASE_NAME;\n";
            }

            print "  ";
            
            if (!$prototype->{nr}) {
                print "return ($prototype->{return}) ";
            }

            print "(*MyEmulHandle->EmulCallDirectOS)(-$prototype->{bias});\n";
            print "}\n";
        }
        elsif ($prototype->{type} eq 'varargs') {
            if ($prototype->{subtype} eq 'tagcall') {
                # number of regs that contain varargs
                my $n = 9 - $prototype->{numregs};

                # add 4 bytes if that's an odd number, to avoid splitting a tag
                my $d = $n & 1 ? 4 : 0;

                # offset of the start of the taglist
                my $taglist = 8;

                # size of the stack frame
                my $local = ($taglist + $n * 4 + $d + 8 + 15) & ~15;

                # clear stack frame & return
                printf "        lwz     0,%d(1)\n", $local + 4;
                print  "        mtlr    0\n";
                printf "        addi    1,1,%d\n", $local;
                print  "        blr\n";
                print  ".L$prototype->{funcname}e1:\n";
                print  "        .size   $prototype->{funcname}," .
                    ".L$prototype->{funcname}e1-$prototype->{funcname}\n";

                print "\");\n";
            }
            else {
                print ");\n";
                print "}\n";
            }
        }
        else {
            $self->SUPER::function_end (@_);
        }
    }


    sub special_function_proto {
        my $self     = shift;
        my %params   = @_;
        my $prototype    = $params{'prototype'};
        my $decl_regular = $params{'decl_regular'};
        my $sfd      = $self->{SFD};

        if ($prototype->{type} eq 'varargs' && $decl_regular) {
            my $rproto = $prototype->{real_prototype};

            print "$$rproto{'return'} $$rproto{'funcname'}(";
            if (!$prototype->{nb}) {
                if ($$rproto{'numargs'} == 0) {
                    print "BASE_PAR_DECL0";
                }
                else {
                    print "BASE_PAR_DECL ";
                }
            }
            print join (', ', @{$$rproto{'___args'}});

            print ");\n";
            print "\n";
        }
        
        print "$$prototype{'return'}\n";
        print "$$prototype{'funcname'}(";
        if (!$prototype->{nb}) {
            if ($$prototype{'numargs'} == 0) {
                print "BASE_PAR_DECL0";
            }
            else {
                print "BASE_PAR_DECL ";
            }
        }

        my @newargs;

        for my $i (0 .. $#{@{$prototype->{___args}}}) {
            if ($prototype->{subtype} ne 'methodcall' ||
                $i != $prototype->{numargs} - 2 ) {
                push @newargs, $prototype->{___args}[$i];
            }
        }

        print join (', ', @newargs);
        print ")";
        
    }
}