Changed as7 to allow sys open statements, rewrite write_test.s to
use this syntax, and fixed up a bug in sys_open in a7out.
This commit is contained in:
Warren Toomey
+21
-22
@@ -86,9 +86,9 @@ sub simulate {
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my $opcode = ( $instruction >> 12 ) & 074;
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my $indirect = ( $instruction >> 13 ) & 1;
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my $addr = $instruction & 017777;
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printf( "PC %06o: instruction %08o, op %03o, ind %o, addr %06o\n",
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$PC, $instruction, $opcode, $indirect, $addr )
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if ($debug);
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#printf( "PC %06o: instruction %08o, op %03o, ind %o, addr %06o\n",
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# $PC, $instruction, $opcode, $indirect, $addr )
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# if ($debug);
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# Simulate the instruction. Each subroutine updates the $PC
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if ( defined( $Oplist{$opcode} ) ) {
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@@ -163,14 +163,14 @@ sub iot {
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if ( defined( $Syscallist{$addr} ) ) {
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$Syscallist{$addr}->();
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} else {
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printf( "Unknown syscall %d at location 0%o\n", $addr, $PC );
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printf( "PC %06o: Unknown syscall %d\n", $PC, $addr );
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die("\n");
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}
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}
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# Exit system call
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sub sys_exit {
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print("exit system call\n") if ($debug);
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printf("PC %06o: exit system call\n", $PC) if ($debug);
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exit(0);
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}
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@@ -178,7 +178,7 @@ sub sys_exit {
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sub sys_close {
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# AC is the file descriptor
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my $fd= $AC;
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print("close: closing fd $fd\n") if ($debug);
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printf("PC %06o: close: closing fd %d\n", $PC, $fd) if ($debug);
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# Bump up the PC
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$PC += 1;
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@@ -207,24 +207,23 @@ sub sys_open {
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# Convert this to a sensible ASCII filename
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my $filename= mem2string($start);
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printf("open: file %s\n", $filename) if ($debug);
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printf("PC %06o: open: file %s\n", $PC, $filename) if ($debug);
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open(my $FH, "<", $filename);
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# No filehandle, so it's an error
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if (!defined($FH)) {
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# Open the file
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if (open(my $FH, "<", $filename)) {
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# Find a place in the @FD array to store this filehandle. 99 is arbitrary
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my $fd;
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foreach $fd (0 .. 99) {
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if (!defined($FD[$fd])) {
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$FD[$fd]= $FH; last;
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}
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}
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$AC=$fd; return;
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} else {
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# No filehandle, so it's an error
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print("open failed: $!\n") if ($debug);
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$AC= 0777777; return;
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}
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# Find a place in the @FD array to store this filehandle. 99 is arbitrary
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my $fd;
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foreach $fd (0 .. 99) {
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if (!defined($FD[$fd])) {
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$FD[$fd]= $FH; last;
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}
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}
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$AC=$fd; return;
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}
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# Read system call
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@@ -238,7 +237,7 @@ sub sys_read {
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my $start= $Mem[$PC+1];
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my $count= $Mem[$PC+2];
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my $end= $start + $count -1;
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printf("read: %d words from %o from fd %d\n", $count, $start, $fd) if ($debug);
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printf("PC %06o: read: %d words from %o from fd %d\n", $PC, $count, $start, $fd) if ($debug);
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# Bump up the PC
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$PC += 3;
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@@ -284,7 +283,7 @@ sub sys_write {
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my $start= $Mem[$PC+1];
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my $count= $Mem[$PC+2];
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my $end= $start + $count -1;
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printf("write: %d words from %o to fd %d\n", $count, $start, $fd) if ($debug);
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printf("PC %06o: write: %d words from %o to fd %d\n", $PC, $count, $start, $fd) if ($debug);
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# Bump up the PC
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$PC += 3;
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@@ -26,8 +26,39 @@ my $stage = 1; # Pass one or pass two
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# Check the arguments
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die("Usage: $0 file1.s [file2.s ...]\n") if ( @ARGV < 1 );
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# Start with the location counter at zero
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$Var{'.'} = 0;
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# Define the syscalls as variables so that
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# I don't have to hand-code the logic below.
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# Also, start with the location counter at zero
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%Var= (
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'.' => 0,
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save => 1,
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getuid => 2,
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open => 3,
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read => 4,
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write => 5,
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creat => 6,
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seek => 7,
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tell => 8,
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close => 9,
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link => 10,
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unlink => 11,
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setuid => 12,
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rename => 13,
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exit => 14,
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time => 15,
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intrp => 16,
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chdir => 17,
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chmod => 18,
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chown => 19,
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badcal => 20,
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syslog => 21,
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capt => 23,
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rele => 24,
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status => 25,
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smes => 27,
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rmes => 28,
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fork => 29
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);
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# Parse all the files
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foreach my $file (@ARGV) {
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@@ -189,6 +220,7 @@ sub parse_expression {
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'i' => 0020000,
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'eae' => 0640000,
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'iot' => 0700000,
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'sys' => 0700000,
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'opr' => 0740000,
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'law' => 0760000,
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'lam' => 0777777,
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+9
-8
@@ -7,16 +7,16 @@ main:
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lac in
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dac out
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" The assembler doesn't know sys write, so iot 5 for now
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" Write hello to fd1 i.e stdout
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lac d1
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iot 5; hello; 7
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sys write; hello; 7
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" open file fred
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iot 3; fred; 0; 0
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sys open; fred; 0; 0
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" read 5 words into the buffer from stdin: type in 10 or more characters!
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lac d0
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iot 4; buf; 5
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sys read; buf; 5
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" Stop and dump memory, so you can see five words at location 0400
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" Comment out the hlt instruction to test close and exit
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@@ -24,10 +24,10 @@ main:
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" close stdin
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lac d0
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iot 9
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sys close
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" exit
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iot 14
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sys exit
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" We should not get to the halt instruction
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hlt
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@@ -41,8 +41,6 @@ in: 023
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out: 0
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" Hello, world\n, two ASCII chars per word
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d0: 0
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d1: 1
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hello: 0110145; 0154154; 0157054; 040; 0167157; 0162154; 0144012
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" fred as a string, NUL terminated
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@@ -51,3 +49,6 @@ fred: 0146162; 0145144; 0
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" Input buffer for read
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. = 0400
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buf: 0
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d0: 0
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d1: 1
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