xtensa: gas: put .literal_position at section start

Provide literal position at the beginning of each section for literal
space reserved by relaxations when text-section-literals or
auto-litpools options are used. Remove code that adds fill frag to the
literal section for every .literal_position directive to avoid creation
of empty literal sections.

Fix auto-litpools tests that got literal pool address changes.

gas/
2019-04-11  Max Filippov  <jcmvbkbc@gmail.com>

	* config/tc-xtensa.c (xtensa_is_init_fini): Add declaration.
	(xtensa_mark_literal_pool_location): Don't add fill frag to literal
	section that records literal pool location.
	(md_begin): Call xtensa_mark_literal_pool_location when text
	section literals or auto litpools are used.
	(xtensa_elf_section_change_hook): Call
	xtensa_mark_literal_pool_location when text section literals or
	auto litpools are used, there's no literal pool location defined
	for the current section and it's not .init or .fini.
	* testsuite/gas/xtensa/auto-litpools-first1.d: Fix up addresses.
	* testsuite/gas/xtensa/auto-litpools-first2.d: Likewise.
	* testsuite/gas/xtensa/auto-litpools.d: Likewise.

gas/ChangeLog

@@ -1,3 +1,18 @@
+2019-04-11  Max Filippov  <jcmvbkbc@gmail.com>
+
+	* config/tc-xtensa.c (xtensa_is_init_fini): Add declaration.
+	(xtensa_mark_literal_pool_location): Don't add fill frag to literal
+	section that records literal pool location.
+	(md_begin): Call xtensa_mark_literal_pool_location when text
+	section literals or auto litpools are used.
+	(xtensa_elf_section_change_hook): Call
+	xtensa_mark_literal_pool_location when text section literals or
+	auto litpools are used, there's no literal pool location defined
+	for the current section and it's not .init or .fini.
+	* testsuite/gas/xtensa/auto-litpools-first1.d: Fix up addresses.
+	* testsuite/gas/xtensa/auto-litpools-first2.d: Likewise.
+	* testsuite/gas/xtensa/auto-litpools.d: Likewise.
+
 2019-04-11  Sudakshina Das  <sudi.das@arm.com>
 
 	* config/tc-aarch64.c (process_omitted_operand): Add case for

gas/config/tc-xtensa.c

@@ -497,6 +497,7 @@ static fixS *xg_append_jump (fragS *fragP, symbolS *sym, offsetT offset);
 static void xtensa_maybe_create_literal_pool_frag (bfd_boolean, bfd_boolean);
 static bfd_boolean auto_litpools = FALSE;
 static int auto_litpool_limit = 0;
+static bfd_boolean xtensa_is_init_fini (segT seg);
 
 /* Alignment Functions.  */
 
@@ -4797,7 +4798,6 @@ xtensa_mark_literal_pool_location (void)
 {
   /* Any labels pointing to the current location need
      to be adjusted to after the literal pool.  */
-  emit_state s;
   fragS *pool_location;
 
   if (use_literal_section)
@@ -4818,19 +4818,7 @@ xtensa_mark_literal_pool_location (void)
 		RELAX_LITERAL_POOL_END, NULL, 0, NULL);
   xtensa_set_frag_assembly_state (frag_now);
 
-  /* Now put a frag into the literal pool that points to this location.  */
   set_literal_pool_location (now_seg, pool_location);
-  xtensa_switch_to_non_abs_literal_fragment (&s);
-  frag_align (2, 0, 0);
-  record_alignment (now_seg, 2);
-
-  /* Close whatever frag is there.  */
-  frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL);
-  xtensa_set_frag_assembly_state (frag_now);
-  frag_now->tc_frag_data.literal_frag = pool_location;
-  frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL);
-  xtensa_restore_emit_state (&s);
-  xtensa_set_frag_assembly_state (frag_now);
 }
 
 
@@ -5334,6 +5322,9 @@ md_begin (void)
   /* Set up the assembly state.  */
   if (!frag_now->tc_frag_data.is_assembly_state_set)
     xtensa_set_frag_assembly_state (frag_now);
+
+  if (!use_literal_section)
+    xtensa_mark_literal_pool_location ();
 }
 
 
@@ -5933,6 +5924,11 @@ xtensa_elf_section_change_hook (void)
   /* Set up the assembly state.  */
   if (!frag_now->tc_frag_data.is_assembly_state_set)
     xtensa_set_frag_assembly_state (frag_now);
+
+  if (!use_literal_section
+      && seg_info (now_seg)->tc_segment_info_data.literal_pool_loc == NULL
+      && !xtensa_is_init_fini (now_seg))
+    xtensa_mark_literal_pool_location ();
 }
 
 

gas/testsuite/gas/xtensa/auto-litpools-first1.d

@@ -5,8 +5,8 @@
 .*: +file format .*xtensa.*
 #...
 Contents of section .text:
- 0000 ........ 20170331 .*
+ 0000 20170331 .*
 #...
-00000000 <f>:
+00000004 <f>:
-.*0:.*j.8 .*
+.*4:.*l32r.*a2, 0.*
 #...

gas/testsuite/gas/xtensa/auto-litpools-first2.d

@@ -5,11 +5,9 @@
 .*: +file format .*xtensa.*
 #...
 Contents of section .text:
- 0000 ........ ........ 20170331 .*
+ 0000 20170331 .*
 #...
-00000000 <f>:
+00000004 <f>:
-   0:.*addi.*a1.*
+   4:.*addi.*a1.*
-   3:.*j.*c.*
+   7:.*l32r.*a2, 0.*
-#...
-   c:.*l32r.*a2, 8.*
 #...

gas/testsuite/gas/xtensa/auto-litpools.d

@@ -4,9 +4,9 @@
 
 .*: +file format .*xtensa.*
 #...
-.*8:.*l32r.a2, 4 .*
+.*4:.*l32r.a2, 0 .*
 #...
-.*3f029:.*j.3f030 .*
+.*3f025:.*j.3f02c .*
 #...
-.*40752:.*l32r.a2, 3f02c .*
+.*4074e:.*l32r.a2, 3f028 .*
 #...