Add support for the ASCII directive inside linker scripts.

* ldlex.l: Add ASCII token.
 * ldgram.y: Add parsing of the ASCII command.
 * ldlang.c (lang_add_string): Add maximum size parameter.  Move escape character handling code into separate function.
 * ldlang.h (lang_add_string): Update prototype.
 * NEWS: Mention the new feature.
 * ld.texi (Output Section Data): Document the new directives.
 * testsuite/ld-scripts/asciz.t: Adjust to work on more architectures and to test more aspects of the ASCIZ directive.
 * testsuite/ld-scripts/asciz.d: Adjust to match the changes to the test linker script.
 * testsuite/ld-scripts/ascii.d: New test driver.
 * testsuite/ld-scripts/ascii.s: New test assembler source.
 * testsuite/ld-scripts/ascii.t: New test script.
 * testsuite/ld-scripts/script.exp: Run the new test.

ld/ldlang.c

@@ -8361,15 +8361,20 @@ lang_add_data (int type, union etree_union *exp)
   new_stmt->type = type;
 }
 
-void
-lang_add_string (const char *s)
-{
-  bfd_vma  len = strlen (s);
-  bfd_vma  i;
-  bool     escape = false;
+/* Convert escape codes in S.
+   Supports \n, \r, \t and \NNN octals.
+   Returns a copy of S in a malloc'ed buffer.  */
 
-  /* Add byte expressions until end of string.  */
-  for (i = 0 ; i < len; i++)
+static char *
+convert_string (const char * s)
+{
+  size_t  len = strlen (s);
+  size_t  i;
+  bool    escape = false;
+  char *  buffer = malloc (len + 1);
+  char *  b;
+
+  for (i = 0, b = buffer; i < len; i++)
     {
       char c = *s++;
 
@@ -8404,7 +8409,7 @@ lang_add_string (const char *s)
 		    value += (c - '0');
 		    i++;
 		    s++;
-
+ 
 		    c = *s;
 		    if ((c >= '0') && (c <= '7'))
 		      {
@@ -8422,26 +8427,58 @@ lang_add_string (const char *s)
 		    i--;
 		    s--;
 		  }
-
+		
 		c = value;
 	      }
 	      break;
 	    }
-
-	  lang_add_data (BYTE, exp_intop (c));
 	  escape = false;
 	}
       else
 	{
 	  if (c == '\\')
-	    escape = true;
-	  else
-	    lang_add_data (BYTE, exp_intop (c));
+	    {
+	      escape = true;
+	      continue;
+	    }
 	}
+
+      * b ++ = c;
     }
 
-  /* Remeber to terminate the string.  */
-  lang_add_data (BYTE, exp_intop (0));
+  * b = 0;
+  return buffer;
+}
+
+void
+lang_add_string (size_t size, const char *s)
+{
+  size_t  len;
+  size_t  i;
+  char *  string;
+
+  string = convert_string (s);
+  len = strlen (string);
+
+  /* Check if it is ASCIZ command (len == 0) */
+  if (size == 0)
+    /* Make sure that we include the terminating nul byte.  */
+    size = len + 1;
+  else if (len >= size)
+    {
+      len = size - 1;
+
+      einfo (_("%P:%pS: warning: ASCII string does not fit in allocated space,"
+               " truncated\n"), NULL);
+    }
+
+  for (i = 0 ; i < len ; i++)
+    lang_add_data (BYTE, exp_intop (string[i]));
+
+  while (i++ < size)
+    lang_add_data (BYTE, exp_intop ('\0'));
+
+  free (string);
 }
 
 /* Create a new reloc statement.  RELOC is the BFD relocation type to