Add a new ".nop" directive to the assembler to allow the creation of no-op instructions in an architeture neutral manner.

	* read.c (s_nop): New function.  Handles the .nop directive.
	(potable): Add entry for "nop".
	(s_nops): Code tidy.
	* read.h (s_nop): Add prototype.
	* config/tc-bpf.h (md_single_noop_insn): Define.
	* config/tc-mmix.h (md_single_noop_insn): Define.
	* config/tc-or1k.h (md_single_noop_insn): Define.
	* config/tc-s12z.c (md_assemble): Preserve the input line pointer,
	rather than corrupting it.
	* write.c (relax_segment): Update error message regarding
	non-absolute values passed to .fill and .nops.
	* NEWS: Mention the new directive.
	* doc/as.texi: Document the new directive.
	* doc/internals.texi: Document the new internal macros used to
	implement the new directive.
	* testsuite/gas/all/nop.s: New test.
	* testsuite/gas/all/nop.d: New test control file.
	* testsuite/gas/all/gas.exp: Run the new test.
	* testsuite/gas/elf/dwarf-5-nop-for-line-table.s: New test.
	* testsuite/gas/elf/dwarf-5-nop-for-line-table.d: New test
	control file.
	* testsuite/gas/elf/elf.exp: Run the new test.
	* testsuite/gas/i386/space1.l: Adjust expected output.

1 files changed, 6 insertions, 3 deletions

diff --git a/gas/config/tc-s12z.c b/gas/config/tc-s12z.c
index d89fb0c..c79d2f4 100644
--- a/gas/config/tc-s12z.c
+++ b/gas/config/tc-s12z.c
@@ -3807,6 +3807,7 @@ md_assemble (char *str)
       return;
     }
 
+  char * saved_ilp = input_line_pointer;
   input_line_pointer = skip_whites (op_end);
 
   size_t i;
@@ -3816,15 +3817,17 @@ md_assemble (char *str)
       if (0 == strcmp (name, opc->name))
 	{
 	  if (opc->parse_operands (opc))
-	    return;
+	    {
+	      input_line_pointer = saved_ilp;
+	      return;
+	    }
 	  continue;
 	}
     }
 
   as_bad (_("Invalid instruction: \"%s\""), str);
   as_bad (_("First invalid token: \"%s\""), fail_line_pointer);
-  while (*input_line_pointer++)
-    ;
+  input_line_pointer = saved_ilp;
 }