mips.c (mips_need_mips16_rdhwr_p): New variable.

gcc/
	* config/mips/mips.c (mips_need_mips16_rdhwr_p): New variable.
	(mips_get_tp): Set it.  Record that __mips16_rdhwr binds locally.
	(mips_start_unique_function, mips_output_mips16_rdhwr)
	(mips_code_end): New functions.
	(TARGET_ASM_CODE_END): Define.

libgcc/
	* config.host (mips64*-*-linux*, mipsisa64*-*-linux*)
	(mips*-*-linux*): Remove t-slibgcc-libgcc.
	* config/mips/t-mips16 (LIB1ASMFUNCS): Remove __mips16_rdhwr.
	* config/mips/mips16.S (__mips16_rdhwr): Delete.

From-SVN: r184380

2 files changed, 71 insertions, 0 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e052b4e..07635df 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,13 @@
 2012-02-19  Richard Sandiford  <rdsandiford@googlemail.com>
 
+	* config/mips/mips.c (mips_need_mips16_rdhwr_p): New variable.
+	(mips_get_tp): Set it.  Record that __mips16_rdhwr binds locally.
+	(mips_start_unique_function, mips_output_mips16_rdhwr)
+	(mips_code_end): New functions.
+	(TARGET_ASM_CODE_END): Define.
+
+2012-02-19  Richard Sandiford  <rdsandiford@googlemail.com>
+
 	* config/mips/mips.c (mips16_build_call_stub): Add CFI information
 	to stubs with non-sibling calls.
 
diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index 2dfbb4b..1a26267 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -592,6 +592,9 @@ struct target_globals *mips16_globals;
    and returned from mips_sched_reorder2.  */
 static int cached_can_issue_more;
 
+/* True if the output uses __mips16_rdhwr.  */
+static bool mips_need_mips16_rdhwr_p;
+
 /* Index R is the smallest register class that contains register R.  */
 const enum reg_class mips_regno_to_class[FIRST_PSEUDO_REGISTER] = {
   LEA_REGS,	LEA_REGS,	M16_REGS,	V1_REG,
@@ -2842,7 +2845,9 @@ mips_get_tp (void)
   tp = gen_reg_rtx (Pmode);
   if (TARGET_MIPS16)
     {
+      mips_need_mips16_rdhwr_p = true;
       fn = mips16_stub_function ("__mips16_rdhwr");
+      SYMBOL_REF_FLAGS (fn) |= SYMBOL_FLAG_LOCAL;
       if (!call_insn_operand (fn, VOIDmode))
 	fn = force_reg (Pmode, fn);
       emit_insn (PMODE_INSN (gen_tls_get_tp_mips16, (tp, fn)));
@@ -5827,6 +5832,33 @@ mips_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
   return addr;
 }
 
+/* Declare a unique, locally-binding function called NAME, then start
+   its definition.  */
+
+static void
+mips_start_unique_function (const char *name)
+{
+  tree decl;
+
+  decl = build_decl (BUILTINS_LOCATION, FUNCTION_DECL,
+		     get_identifier (name),
+		     build_function_type_list (void_type_node, NULL_TREE));
+  DECL_RESULT (decl) = build_decl (BUILTINS_LOCATION, RESULT_DECL,
+				   NULL_TREE, void_type_node);
+  TREE_PUBLIC (decl) = 1;
+  TREE_STATIC (decl) = 1;
+
+  DECL_COMDAT_GROUP (decl) = DECL_ASSEMBLER_NAME (decl);
+
+  targetm.asm_out.unique_section (decl, 0);
+  switch_to_section (get_named_section (decl, NULL, 0));
+
+  targetm.asm_out.globalize_label (asm_out_file, name);
+  fputs ("\t.hidden\t", asm_out_file);
+  assemble_name (asm_out_file, name);
+  putc ('\n', asm_out_file);
+}
+
 /* Start a definition of function NAME.  MIPS16_P indicates whether the
    function contains MIPS16 code.  */
 
@@ -5865,6 +5897,26 @@ mips_end_function_definition (const char *name)
     }
 }
 
+/* Output a definition of the __mips16_rdhwr function.  */
+
+static void
+mips_output_mips16_rdhwr (void)
+{
+  const char *name;
+
+  name = "__mips16_rdhwr";
+  mips_start_unique_function (name);
+  mips_start_function_definition (name, false);
+  fprintf (asm_out_file,
+	   "\t.set\tpush\n"
+	   "\t.set\tmips32r2\n"
+	   "\t.set\tnoreorder\n"
+	   "\trdhwr\t$3,$29\n"
+	   "\t.set\tpop\n"
+	   "\tj\t$31\n");
+  mips_end_function_definition (name);
+}
+
 /* Return true if calls to X can use R_MIPS_CALL* relocations.  */
 
 static bool
@@ -8467,6 +8519,15 @@ mips_file_start (void)
 	     ASM_COMMENT_START,
 	     mips_small_data_threshold, mips_arch_info->name, mips_isa);
 }
+
+/* Implement TARGET_ASM_CODE_END.  */
+
+static void
+mips_code_end (void)
+{
+  if (mips_need_mips16_rdhwr_p)
+    mips_output_mips16_rdhwr ();
+}
 
 /* Make the last instruction frame-related and note that it performs
    the operation described by FRAME_PATTERN.  */
@@ -17357,6 +17418,8 @@ mips_expand_vec_minmax (rtx target, rtx op0, rtx op1,
 #define TARGET_ASM_FILE_START mips_file_start
 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
+#undef TARGET_ASM_CODE_END
+#define TARGET_ASM_CODE_END mips_code_end
 
 #undef TARGET_INIT_LIBFUNCS
 #define TARGET_INIT_LIBFUNCS mips_init_libfuncs