pa.c (pa_som_asm_init_sections): Don't force all constant data into data section…

pa.c (pa_som_asm_init_sections): Don't force all constant data into data section when generating PIC code.

	* config/pa/pa.c (pa_som_asm_init_sections): Don't force all constant
	data into data section when generating PIC code.
	(pa_select_section): Use pa_reloc_rw_mask() to qualify relocs.
	(pa_reloc_rw_mask): Return 3 when generating PIC code and when
	generating code for SOM targets earlier than HP-UX 11.  Otherwise,
	return 2 for SOM and 0 for other targets.

From-SVN: r273557

gcc/ChangeLog

+2019-07-17  John David Anglin  <danglin@gcc.gnu.org>
+
+	* config/pa/pa.c (pa_som_asm_init_sections): Don't force all constant
+	data into data section when generating PIC code.
+	(pa_select_section): Use pa_reloc_rw_mask() to qualify relocs.
+	(pa_reloc_rw_mask): Return 3 when generating PIC code and when
+	generating code for SOM targets earlier than HP-UX 11.  Otherwise,
+	return 2 for SOM and 0 for other targets.
+	 
 2019-07-17  Jeff Law  <law@redhat.com>
 
 	* tree-ssa-dse.c (initialize_ao_ref_for_dse): Fix formatting.

gcc/config/pa/pa.c

@@ -9805,19 +9805,22 @@ pa_som_asm_init_sections (void)
       = get_unnamed_section (0, output_section_asm_op,
 			     "\t.SPACE $PRIVATE$\n\t.SUBSPA $TM_CLONE_TABLE$");
 
-  /* FIXME: HPUX ld generates incorrect GOT entries for "T" fixups
-     which reference data within the $TEXT$ space (for example constant
+  /* HPUX ld generates incorrect GOT entries for "T" fixups which
+     reference data within the $TEXT$ space (for example constant
      strings in the $LIT$ subspace).
 
      The assemblers (GAS and HP as) both have problems with handling
-     the difference of two symbols which is the other correct way to
+     the difference of two symbols.  This is the other correct way to
      reference constant data during PIC code generation.
 
-     So, there's no way to reference constant data which is in the
-     $TEXT$ space during PIC generation.  Instead place all constant
-     data into the $PRIVATE$ subspace (this reduces sharing, but it
-     works correctly).  */
-  readonly_data_section = flag_pic ? data_section : som_readonly_data_section;
+     Thus, we can't put constant data needing relocation in the $TEXT$
+     space during PIC generation.
+
+     Previously, we placed all constant data into the $DATA$ subspace
+     when generating PIC code.  This reduces sharing, but it works
+     correctly.  Now we rely on pa_reloc_rw_mask() for section selection.
+     This puts constant data not needing relocation into the $TEXT$ space.  */
+  readonly_data_section = som_readonly_data_section;
 
   /* We must not have a reference to an external symbol defined in a
      shared library in a readonly section, else the SOM linker will
@@ -9850,7 +9853,7 @@ pa_select_section (tree exp, int reloc,
       && DECL_INITIAL (exp)
       && (DECL_INITIAL (exp) == error_mark_node
           || TREE_CONSTANT (DECL_INITIAL (exp)))
-      && !reloc)
+      && !(reloc & pa_reloc_rw_mask ()))
     {
       if (TARGET_SOM
 	  && DECL_ONE_ONLY (exp)
@@ -9859,7 +9862,8 @@ pa_select_section (tree exp, int reloc,
       else
 	return readonly_data_section;
     }
-  else if (CONSTANT_CLASS_P (exp) && !reloc)
+  else if (CONSTANT_CLASS_P (exp)
+	   && !(reloc & pa_reloc_rw_mask ()))
     return readonly_data_section;
   else if (TARGET_SOM
 	   && TREE_CODE (exp) == VAR_DECL
@@ -9875,12 +9879,11 @@ pa_select_section (tree exp, int reloc,
 static int
 pa_reloc_rw_mask (void)
 {
-  /* We force (const (plus (symbol) (const_int))) to memory when the
-     const_int doesn't fit in a 14-bit integer.  The SOM linker can't
-     handle this construct in read-only memory and we want to avoid
-     this for ELF.  So, we always force an RTX needing relocation to
-     the data section.  */
-  return 3;
+  if (flag_pic || (TARGET_SOM && !TARGET_HPUX_11))
+    return 3;
+
+  /* HP linker does not support global relocs in readonly memory.  */
+  return TARGET_SOM ? 2 : 0;
 }
 
 static void