[NDS32] Support Linux target for nds32.

gcc/
	* config.gcc (nds32*): Use nds32-linux.opt and nds32-elf.opt.
	(nds32le-*-*, nds32be-*-*): Integrate checking process.
	(nds32*-*-*): Add glibc and uclibc conditions.
	* common/config/nds32/nds32-common.c (nds32_except_unwind_info): New.
	(TARGET_EXCEPT_UNWIND_INFO): Define.
	* config/nds32/elf.h: New file.
	* config/nds32/linux.h: New file.
	* config/nds32/nds32-elf.opt: New file.
	* config/nds32/nds32-linux.opt: New file.
	* config/nds32/nds32-fp-as-gp.c
	(pass_nds32_fp_as_gp::gate): Consider TARGET_LINUX_ABI.
	* config/nds32/nds32.c (nds32_conditional_register_usage): Consider
	TARGET_LINUX_ABI.
	(nds32_asm_file_end): Ditto.
	(nds32_print_operand): Ditto.
	(nds32_insert_attributes): Ditto.
	(nds32_init_libfuncs): New function.
	(TARGET_HAVE_TLS): Define.
	(TARGET_INIT_LIBFUNCS): Define.
	* config/nds32/nds32.h (TARGET_DEFAULT_RELAX): Apply different relax
	spec content.
	(TARGET_ELF): Apply different mcmodel setting.
	(LINK_SPEC, LIB_SPEC, STARTFILE_SPEC, ENDFILE_SPEC): The content has
	been migrated into elf.h and linux.h files.
	* config/nds32/nds32.md (add_pc): Consider TARGET_LINUX_ABI.
	* config/nds32/nds32.opt (mvh): Consider TARGET_LINUX_ABI.
	(mcmodel): The content has been migrated into nds32-elf.opt and
	nds32-linux.opt files.
	* config/nds32/t-elf: New file.
	* config/nds32/t-linux: New file.

libgcc/
	* config.host (nds32*-linux*): New.
	* config/nds32/linux-atomic.c: New file.
	* config/nds32/linux-unwind.h: New file.

Co-Authored-By: Kito Cheng <kito.cheng@gmail.com>
Co-Authored-By: Monk Chiang <sh.chiang04@gmail.com>

From-SVN: r261116

1 files changed, 49 insertions, 10 deletions

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 4d9f9c6..c3aecbf 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -448,6 +448,16 @@ mips*-*-*)
 nds32*)
 	cpu_type=nds32
 	extra_headers="nds32_intrinsic.h"
+	case ${target} in
+	  nds32*-*-linux*)
+	    extra_options="${extra_options} nds32/nds32-linux.opt"
+	    ;;
+	  nds32*-*-elf*)
+	    extra_options="${extra_options} nds32/nds32-elf.opt"
+	    ;;
+	  *)
+	    ;;
+	esac
 	extra_objs="nds32-cost.o nds32-intrinsic.o nds32-isr.o nds32-md-auxiliary.o nds32-pipelines-auxiliary.o nds32-predicates.o nds32-memory-manipulation.o nds32-fp-as-gp.o nds32-relax-opt.o nds32-utils.o"
 	;;
 nios2-*-*)
@@ -2335,18 +2345,32 @@ msp430*-*-*)
 	tmake_file="${tmake_file} msp430/t-msp430"
 	extra_gcc_objs="driver-msp430.o"
 	;;
-nds32le-*-*)
+nds32*-*-*)
 	target_cpu_default="0"
 	tm_defines="${tm_defines}"
-	tm_file="dbxelf.h elfos.h newlib-stdint.h ${tm_file} nds32/nds32_intrinsic.h"
-	tmake_file="nds32/t-nds32 nds32/t-mlibs"
-	;;
-nds32be-*-*)
-	target_cpu_default="0|MASK_BIG_ENDIAN"
-	tm_defines="${tm_defines} TARGET_BIG_ENDIAN_DEFAULT=1"
-	tm_file="dbxelf.h elfos.h newlib-stdint.h ${tm_file} nds32/nds32_intrinsic.h"
-	tmake_file="nds32/t-nds32 nds32/t-mlibs"
+	case ${target} in
+	  nds32le*-*-*)
+	    ;;
+	  nds32be-*-*)
+	    target_cpu_default="${target_cpu_default}|MASK_BIG_ENDIAN"
+	    tm_defines="${tm_defines} TARGET_BIG_ENDIAN_DEFAULT=1"
+	    ;;
+	esac
+	case ${target} in
+	  nds32*-*-elf*)
+	    tm_file="dbxelf.h elfos.h newlib-stdint.h ${tm_file} nds32/elf.h nds32/nds32_intrinsic.h"
+	    tmake_file="nds32/t-nds32 nds32/t-elf"
+	    ;;
+	  nds32*-*-linux*)
+	    tm_file="dbxelf.h elfos.h ${tm_file} gnu-user.h linux.h glibc-stdint.h nds32/linux.h nds32/nds32_intrinsic.h"
+	    tmake_file="${tmake_file} nds32/t-nds32 nds32/t-linux"
+	    ;;
+	esac
 
+	# Handle --enable-default-relax setting.
+	if test x${enable_default_relax} = xyes; then
+		tm_defines="${tm_defines} TARGET_DEFAULT_RELAX=1"
+	fi
 	# Handle --with-ext-dsp
 	if test x${with_ext_dsp} = xyes; then
 		tm_defines="${tm_defines} TARGET_DEFAULT_EXT_DSP=1"
@@ -4383,15 +4407,30 @@ case "${target}" in
 		"")
 			# the default library is newlib
 			with_nds32_lib=newlib
+			tm_defines="${tm_defines} TARGET_DEFAULT_CTOR_DTOR=1"
 			;;
 		newlib)
 			# OK
+			tm_defines="${tm_defines} TARGET_DEFAULT_CTOR_DTOR=1"
 			;;
 		mculib)
 			# OK
+			# for the arch=v3f or arch=v3s under mculib toolchain,
+			# we would like to set -fno-math-errno as default
+			case "${with_arch}" in
+			v3f | v3s)
+				tm_defines="${tm_defines} TARGET_DEFAULT_NO_MATH_ERRNO=1"
+				;;
+			esac
+			;;
+		glibc)
+			# OK
+			tm_defines="${tm_defines} TARGET_DEFAULT_TLSDESC_TRAMPOLINE=1"
+			;;
+		uclibc)
 			;;
 		*)
-			echo "Cannot accept --with-nds32-lib=$with_nds32_lib, available values are: newlib mculib" 1>&2
+			echo "Cannot accept --with-nds32-lib=$with_nds32_lib, available values are: newlib mculib glibc uclibc" 1>&2
 			exit 1
 			;;
 		esac