Correct the parsing of derferred register addressing in the PDP11 assembler.

	PR 23481
	* config/tc-pdp11.c (parse_op_noreg): Check for deferred register
	addressing before assuming non-deferred addressing.
	* testsuite/gas/pdp11/pr23481.s: New test source file.
	* testsuite/gas/pdp11/pr23481.d: New test driver file.
	* testsuite/gas/pdp11/pdp11.exp: Run the new test.

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 4467bb2..7874132 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,13 @@
+2018-08-07  James Patrick Conlon  <cptjustice@gmail.com>
+           Nick Clifton  <nickc@redhat.com>
+
+       PR 23481
+       * config/tc-pdp11.c (parse_op_noreg): Check for deferred register
+       addressing before assuming non-deferred addressing.
+       * testsuite/gas/pdp11/pr23481.s: New test source file.
+       * testsuite/gas/pdp11/pr23481.d: New test driver file.
+       * testsuite/gas/pdp11/pdp11.exp: Run the new test.
+
 2018-08-06  Claudiu Zissulescu  <claziss@synopsys.com>
 
        * config/tc-arc.c (rf16_only): New static variable.
@@ -93,7 +103,7 @@
        (swap_2_operands): Also swap flags fields.
        * config/tc-i386-intel.c (i386_intel_operand): Likewise.
 
-2018-08-01  James Patrick Conlon <cptjustice@gmail.com>
+2018-08-01  James Patrick Conlon  <cptjustice@gmail.com>
            Nick Clifton  <nickc@redhat.com>
 
        PR 14480

diff --git a/gas/config/tc-pdp11.c b/gas/config/tc-pdp11.c
index e151b27..1ebd461 100644 (file)
--- a/gas/config/tc-pdp11.c
+++ b/gas/config/tc-pdp11.c
@@ -350,10 +350,7 @@ parse_reg (char *str, struct pdp11_code *operand)
       str += 2;
     }
   else
-    {
-      operand->error = _("Bad register name");
-      return str;
-    }
+    operand->error = _("Bad register name");
 
   return str;
 }
@@ -594,10 +591,21 @@ parse_op_noreg (char *str, struct pdp11_code *operand)
           str = parse_op_no_deferred (str, operand);
         }
       else
-        str = parse_op_no_deferred (str + 1, operand);
+        {
+          /* @Rn == (Rn): Register deferred.  */
+          str = parse_reg (str + 1, operand);
+         
+          /* Not @Rn */
+          if (operand->error)
+           {
+             operand->error = NULL;
+             str = parse_op_no_deferred (str, operand);
+           }
+        }
 
       if (operand->error)
        return str;
+
       operand->code |= 010;
     }
   else

diff --git a/gas/testsuite/gas/pdp11/pdp11.exp b/gas/testsuite/gas/pdp11/pdp11.exp
index b3609f9..0c78566 100644 (file)
--- a/gas/testsuite/gas/pdp11/pdp11.exp
+++ b/gas/testsuite/gas/pdp11/pdp11.exp
@@ -22,4 +22,5 @@ if [expr [istarget "pdp11-*-*"]]  then {
     run_dump_test "opcode"
     run_dump_test "absreloc"
     run_dump_test "pr14480"
+    run_dump_test "pr23481"
 }

diff --git a/gas/testsuite/gas/pdp11/pr23481.d b/gas/testsuite/gas/pdp11/pr23481.d
new file mode 100644 (file)
index 0000000..fb40785
--- /dev/null
+++ b/gas/testsuite/gas/pdp11/pr23481.d
@@ -0,0 +1,14 @@
+#name: PR 23481 - correct assembly of '@rN' and '(rN)'
+#objdump: -dw
+
+dump.o: +file format .*
+
+Disassembly of section .text:
+
+0+00 <start>:
+[      ]+0:[   ]+2009[         ]+cmp[  ]+r0, \(r1\)
+[      ]+2:[   ]+2009[         ]+cmp[  ]+r0, \(r1\)
+[      ]+4:[   ]+2240[         ]+cmp[  ]+\(r1\), r0
+[      ]+6:[   ]+2240[         ]+cmp[  ]+\(r1\), r0
+[      ]+8:[   ]+2249[         ]+cmp[  ]+\(r1\), \(r1\)
+#pass

diff --git a/gas/testsuite/gas/pdp11/pr23481.s b/gas/testsuite/gas/pdp11/pr23481.s
new file mode 100644 (file)
index 0000000..5a61b98
--- /dev/null
+++ b/gas/testsuite/gas/pdp11/pr23481.s
@@ -0,0 +1,10 @@
+start:
+        cmp     r0,(r1)
+        cmp     r0,@r1
+        cmp     (r1),r0
+        cmp     @r1,r0
+        cmp     (r1),@r1
+
+        halt
+
+        .END