xtensa: gas: support optional immediate simcall parameter

Starting with RH.0 release Xtensa ISA adds immediate parameter to
simcall opcode. For assembly source compatibility treat "simcall"
instruction without parameter as "simcall 0" when parameter is required.

2020-04-29  Max Filippov  <jcmvbkbc@gmail.com>
gas/
	* config/tc-xtensa.c (XTENSA_MARCH_EARLIEST): Define macro as 0
	if it's not defined.
	(microarch_earliest): New static variable.
	(xg_translate_idioms): Translate "simcall" to "simcall 0" when
	simcall opcode has mandatory parameter.
	(xg_init_global_config): Initialize microarch_earliest.

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 69e117cf5ebcdc729443363483c02db18731f5d8..f47deba09b6317c8c979d99afd0cb98b2fcc3172 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,12 @@
+2020-04-29  Max Filippov  <jcmvbkbc@gmail.com>
+
+       * config/tc-xtensa.c (XTENSA_MARCH_EARLIEST): Define macro as 0
+       if it's not defined.
+       (microarch_earliest): New static variable.
+       (xg_translate_idioms): Translate "simcall" to "simcall 0" when
+       simcall opcode has mandatory parameter.
+       (xg_init_global_config): Initialize microarch_earliest.
+
 2020-04-29  Nick Clifton  <nickc@redhat.com>
 
        PR 22699

diff --git a/gas/config/tc-xtensa.c b/gas/config/tc-xtensa.c
index ee75c13548ff1ba0f04b3e74b81188fc52338ec7..14a5a2a9497e45abdf2035b77f95e59970a327c5 100644 (file)
--- a/gas/config/tc-xtensa.c
+++ b/gas/config/tc-xtensa.c
@@ -35,6 +35,10 @@
 #define XSHAL_ABI 0
 #endif
 
+#ifndef XTENSA_MARCH_EARLIEST
+#define XTENSA_MARCH_EARLIEST 0
+#endif
+
 #ifndef uint32
 #define uint32 unsigned int
 #endif
@@ -74,6 +78,8 @@ const char FLT_CHARS[] = "rRsSfFdDxXpP";
 bfd_boolean density_supported;
 bfd_boolean absolute_literals_supported;
 
+static unsigned microarch_earliest;
+
 static vliw_insn cur_vinsn;
 
 unsigned xtensa_num_pipe_stages;
@@ -2502,6 +2508,18 @@ xg_translate_idioms (char **popname, int *pnum_args, char **arg_strings)
       return 0;
     }
 
+  /* Without an operand, this is given a default immediate operand of 0.  */
+  if ((strcmp (opname, "simcall") == 0 && microarch_earliest >= 280000))
+    {
+      if (*pnum_args == 0)
+       {
+         arg_strings[0] = (char *) xmalloc (2);
+         strcpy (arg_strings[0], "0");
+         *pnum_args = 1;
+       }
+      return 0;
+    }
+
   if (strcmp (opname, "bbsi.l") == 0)
     {
       if (xg_check_num_args (pnum_args, 3, opname, arg_strings))
@@ -5236,6 +5254,8 @@ xg_init_global_config (void)
 
   directive_state[directive_density] = XCHAL_HAVE_DENSITY;
   directive_state[directive_absolute_literals] = XSHAL_USE_ABSOLUTE_LITERALS;
+
+  microarch_earliest = XTENSA_MARCH_EARLIEST;
 }
 
 void