Update MIPS configuration rules.

Add a configuration choice for the NaN format on MIPS (either the
standard (legacy) format or the newer IEEE 2008 format.

Change how CPU_LDFLAGS are set for MIPS.  Use the same value as
CPU_CFLAGS since CC is used to do linking.  This ensures consistency
between compiles and links and adds support for N32 ABI to linking.

Signed-off-by: Steve Ellcey <sellcey@imgtec.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

Rules.mak

@@ -412,17 +412,14 @@ ifeq ($(TARGET_ARCH),mips)
 	CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
 	CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
 	CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64R2)+=-mips64r2 -mtune=mips64r2
-	ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
-		CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
-		CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
-	endif
-	ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
-		CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
-		CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
-	endif
 	CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
 	CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
 	CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
+
+	CPU_CFLAGS-$(CONFIG_MIPS_NAN_LEGACY)+=-mnan=legacy
+	CPU_CFLAGS-$(CONFIG_MIPS_NAN_2008)+=-mnan=2008
+
+	CPU_LDFLAGS-y += $(CPU_CFLAGS)
 endif
 
 ifeq ($(TARGET_ARCH),nios)

extra/Configs/Config.mips

@@ -32,6 +32,21 @@ config CONFIG_MIPS_N64_ABI
 
 endchoice
 
+choice
+	prompt "Target NAN Encoding"
+	default CONFIG_MIPS_NAN_LEGACY
+	help
+	  This is the NAN Encoding you want to use.  Chose either Legacy
+	  or 2008.
+
+config CONFIG_MIPS_NAN_LEGACY
+	bool "LEGACY"
+
+config CONFIG_MIPS_NAN_2008
+	bool "2008"
+
+endchoice
+
 choice
 	prompt "Target Processor Architecture"
 	default CONFIG_MIPS_ISA_1 if CONFIG_MIPS_O32_ABI