* readelf.c (get_machine_dlags): Add support for RX's PID mode.

	* ld-scripts/phdrs.exp: Expect to fail for the RX.

	* elf32-rx.c: Add support for PID mode.
	(rx_elf_relocate_section): Add checks for unsafe PID relocations.
	Include addend in R_RX_SYM relocations.

	* config/rx-defs.h (rx_pid_register): New.
	(rx_gp_register): New.
	* config/rx-parse.y (rx_lex): Add support for %gpreg and %pidreg.
	(displacement): Add PID support.
	* config/tc-rx.c (rx_pid_mode): New.
	(rx_num_int_regs): New.
	(rx_pid_register): New.
	(rx_gp_register): New.
	(options): Add -mpid and -mint-register= options.
	(md_longopts): Likewise.
	(md_parse_option): Likewise.
	(md_show_usage): Likewise.
	(rx_pid_symbol): New.
	(rx_pidreg_symbol): New.
	(rx_gpreg_symbol): New.
	(md_begin): Support PID.
	(rx_validate_fix_sub): Support PID.
	(tc_gen_reloc): Support PID.
	* doc/c-rx.texi: Document PID support.

	* rx.h (E_FLAG_RX_PID): New.

1 files changed, 31 insertions, 0 deletions

diff --git a/gas/config/rx-parse.y b/gas/config/rx-parse.y
index 2d1f85e9f4c..b473788cc04 100644
--- a/gas/config/rx-parse.y
+++ b/gas/config/rx-parse.y
@@ -1170,6 +1170,8 @@ rx_lex (void)
     return 0;
 
   if (ISALPHA (*rx_lex_start)
+      || (rx_pid_register != -1 && memcmp (rx_lex_start, "%pidreg", 7) == 0)
+      || (rx_gp_register != -1 && memcmp (rx_lex_start, "%gpreg", 6) == 0)
       || (*rx_lex_start == '.' && ISALPHA (rx_lex_start[1])))
     {
       unsigned int i;
@@ -1183,6 +1185,28 @@ rx_lex (void)
       save = *e;
       *e = 0;
 
+      if (strcmp (rx_lex_start, "%pidreg") == 0)
+	{
+	  {
+	    rx_lval.regno = rx_pid_register;
+	    *e = save;
+	    rx_lex_start = e;
+	    rx_last_token = REG;
+	    return REG;
+	  }
+	}
+
+      if (strcmp (rx_lex_start, "%gpreg") == 0)
+	{
+	  {
+	    rx_lval.regno = rx_gp_register;
+	    *e = save;
+	    rx_lex_start = e;
+	    rx_last_token = REG;
+	    return REG;
+	  }
+	}
+
       if (rx_last_token == 0)
 	for (ci = 0; ci < NUM_CONDITION_OPCODES; ci ++)
 	  if (check_condition (condition_opcode_table[ci].string))
@@ -1482,6 +1506,13 @@ displacement (expressionS exp, int msize)
 	}
     }
 
+  if (exp.X_op == O_subtract)
+    {
+      exp.X_md = BFD_RELOC_RX_DIFF;
+      O2 (exp);
+      return 2;
+    }
+
   if (exp.X_op != O_constant)
     {
       rx_error (_("displacements must be constants"));