[ARC] Disable TP register when building for bare metal.

gcc/
2017-03-27  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/elf.h (ARGET_ARC_TP_REGNO_DEFAULT): Define.
	* config/arc/linux.h (ARGET_ARC_TP_REGNO_DEFAULT): Likewise.
	* config/arc/arc.opt (mtp-regno): Use ARGET_ARC_TP_REGNO_DEFAULT.

From-SVN: r246497

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 598f03d..2740aa6 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,11 @@
 2017-03-27  Claudiu Zissulescu  <claziss@synopsys.com>
 
+       * config/arc/elf.h (ARGET_ARC_TP_REGNO_DEFAULT): Define.
+       * config/arc/linux.h (ARGET_ARC_TP_REGNO_DEFAULT): Likewise.
+       * config/arc/arc.opt (mtp-regno): Use ARGET_ARC_TP_REGNO_DEFAULT.
+
+2017-03-27  Claudiu Zissulescu  <claziss@synopsys.com>
+
        * config/arc/predicates.md (long_immediate_loadstore_operand):
        Consider scaled addresses cases.
 

diff --git a/gcc/config/arc/arc.opt b/gcc/config/arc/arc.opt
index 17af736..6060ded 100644 (file)
--- a/gcc/config/arc/arc.opt
+++ b/gcc/config/arc/arc.opt
@@ -469,7 +469,7 @@ EnumValue
 Enum(arc_fpu) String(fpud_all) Value(FPU_FPUD_ALL)
 
 mtp-regno=
-Target RejectNegative Joined UInteger Var(arc_tp_regno) Init(25)
+Target RejectNegative Joined UInteger Var(arc_tp_regno) Init(TARGET_ARC_TP_REGNO_DEFAULT)
 Specify thread pointer register number.
 
 mtp-regno=none

diff --git a/gcc/config/arc/elf.h b/gcc/config/arc/elf.h
index d2106c5..2b572a5 100644 (file)
--- a/gcc/config/arc/elf.h
+++ b/gcc/config/arc/elf.h
@@ -53,3 +53,7 @@ along with GCC; see the file COPYING3.  If not see
 #  define MULTILIB_DEFAULTS { "mcpu=" ARC_MULTILIB_CPU_DEFAULT }
 # endif
 #endif
+
+/* Bare-metal toolchains do not need a thread pointer register.  */
+#undef TARGET_ARC_TP_REGNO_DEFAULT
+#define TARGET_ARC_TP_REGNO_DEFAULT -1

diff --git a/gcc/config/arc/linux.h b/gcc/config/arc/linux.h
index 10c291c..6e1a96e 100644 (file)
--- a/gcc/config/arc/linux.h
+++ b/gcc/config/arc/linux.h
@@ -74,3 +74,7 @@ along with GCC; see the file COPYING3.  If not see
 /* We do not have any MULTILIB_OPTIONS specified, so there are no
    MULTILIB_DEFAULTS.  */
 #undef  MULTILIB_DEFAULTS
+
+/* Linux toolchains use r25 as the thread pointer register.  */
+#undef TARGET_ARC_TP_REGNO_DEFAULT
+#define TARGET_ARC_TP_REGNO_DEFAULT 25