arm.opt (-marm-pic-data-is-text-relative): New option.

2013-11-19  Joey Ye  <joey.ye@arm.com>

        * config/arm/arm.opt (-marm-pic-data-is-text-relative): New option.
        * doc/invoke.texi (-marm-pic-data-is-text-relative): Documentation
        for new option.
        * config/arm/arm.c (arm_option_override): By default disable
        -marm-pic-data-is-text-relative.
        (legitimize_pic_address): Use arm_pic_data_is_text_relative.
        (arm_assemble_integer): Likewise.
        * config/arm/arm.h (TARGET_DEFAULT_PIC_DATA_IS_TEXT_RELATIVE): 
        New macro to initialize -marm-pic-data-is-text-relative.

From-SVN: r205016

gcc/ChangeLog

+2013-11-19  Joey Ye  <joey.ye@arm.com>
+
+	* config/arm/arm.opt (-marm-pic-data-is-text-relative): New option.
+	* doc/invoke.texi (-marm-pic-data-is-text-relative): Documentation
+	for new option.
+	* config/arm/arm.c (arm_option_override): By default disable
+	-marm-pic-data-is-text-relative.
+	(legitimize_pic_address): Use arm_pic_data_is_text_relative.
+	(arm_assemble_integer): Likewise.
+	* config/arm/arm.h (TARGET_DEFAULT_PIC_DATA_IS_TEXT_RELATIVE):
+	New macro to initialize -marm-pic-data-is-text-relative.
+
 2013-11-19  Bin Cheng  <bin.cheng@arm.com>
 
 	* tree-ssa-loop-ivopts.c (enum ainc_type): New.

gcc/config/arm/arm.c

@@ -2449,6 +2449,10 @@ arm_option_override (void)
 	arm_pic_register = pic_register;
     }
 
+  if (TARGET_VXWORKS_RTP
+      && !global_options_set.x_arm_pic_data_is_text_relative)
+    arm_pic_data_is_text_relative = 0;
+
   /* Enable -mfix-cortex-m3-ldrd by default for Cortex-M3 cores.  */
   if (fix_cm3_ldrd == 2)
     {
@@ -5965,7 +5969,7 @@ legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg)
 	   || (GET_CODE (orig) == SYMBOL_REF &&
 	       SYMBOL_REF_LOCAL_P (orig)))
 	  && NEED_GOT_RELOC
-	  && !TARGET_VXWORKS_RTP)
+	  && arm_pic_data_is_text_relative)
 	insn = arm_pic_static_addr (orig, reg);
       else
 	{
@@ -21458,7 +21462,7 @@ arm_assemble_integer (rtx x, unsigned int size, int aligned_p)
 	{
 	  /* See legitimize_pic_address for an explanation of the
 	     TARGET_VXWORKS_RTP check.  */
-	  if (TARGET_VXWORKS_RTP
+	  if (!arm_pic_data_is_text_relative
 	      || (GET_CODE (x) == SYMBOL_REF && !SYMBOL_REF_LOCAL_P (x)))
 	    fputs ("(GOT)", asm_out_file);
 	  else

gcc/config/arm/arm.h

@@ -568,6 +568,10 @@ extern int prefer_neon_for_64bits;
 #define NEED_PLT_RELOC	0
 #endif
 
+#ifndef TARGET_DEFAULT_PIC_DATA_IS_TEXT_RELATIVE
+#define TARGET_DEFAULT_PIC_DATA_IS_TEXT_RELATIVE 1
+#endif
+
 /* Nonzero if we need to refer to the GOT with a PC-relative
    offset.  In other words, generate
 

gcc/config/arm/arm.opt

@@ -158,6 +158,10 @@ mlong-calls
 Target Report Mask(LONG_CALLS)
 Generate call insns as indirect calls, if necessary
 
+mpic-data-is-text-relative
+Target Report Var(arm_pic_data_is_text_relative) Init(TARGET_DEFAULT_PIC_DATA_IS_TEXT_RELATIVE)
+Assume data segments are relative to text segment.
+
 mpic-register=
 Target RejectNegative Joined Var(arm_pic_register_string)
 Specify the register to be used for PIC addressing

gcc/doc/invoke.texi

@@ -12188,6 +12188,12 @@ before execution begins.
 Specify the register to be used for PIC addressing.  The default is R10
 unless stack-checking is enabled, when R9 is used.
 
+@item -mpic-data-is-text-relative
+@opindex mpic-data-is-text-relative
+Assume that each data segments are relative to text segment at load time.
+Therefore, it permits addressing data using PC-relative operations.
+This option is on by default for targets other than VxWorks RTP.
+
 @item -mpoke-function-name
 @opindex mpoke-function-name
 Write the name of each function into the text section, directly