[v2,01/12] nds32: Build Infastructure

diff --git a/sysdeps/nds32/Implies b/sysdeps/nds32/Implies
new file mode 100644
index 0000000..387a0ca
--- /dev/null
+++ b/sysdeps/nds32/Implies
@@ -0,0 +1,3 @@ 
+wordsize-32
+ieee754/dbl-64
+ieee754/flt-32
diff --git a/sysdeps/nds32/Makefile b/sysdeps/nds32/Makefile
new file mode 100644
index 0000000..0ed96ab
--- /dev/null
+++ b/sysdeps/nds32/Makefile
@@ -0,0 +1,15 @@ 
+ifeq ($(subdir),elf)
+sysdep-dl-routines += tlsdesc dl-tlsdesc
+sysdep_routines += tlsdesc dl-tlsdesc
+sysdep-rtld-routines += tlsdesc dl-tlsdesc
+endif
+
+ifeq ($(subdir),csu)
+gen-as-const-headers += tlsdesc.sym
+endif
+
+ifeq ($(subdir),stdlib)
+# Avoid compiler calling abort() function when encountering
+# divde-by-zero case.
+CFLAGS-divrem.c += -fno-isolate-erroneous-paths-dereference
+endif
diff --git a/sysdeps/nds32/configure b/sysdeps/nds32/configure
new file mode 100755
index 0000000..8ece006
--- /dev/null
+++ b/sysdeps/nds32/configure
@@ -0,0 +1,10 @@ 
+# This file is generated from configure.ac by Autoconf.  DO NOT EDIT!
+ # Local configure fragment for sysdeps/nds32.
+
+# For nds32 ABI for linux toolchain, the $r15 register is not only an
+# assembler reserved register but also used to passing the sysem call
+# number. In order to ensure the data safety, $r15 is included in
+# clobber list by default. Using the option -minline-asm-r15 can
+# avoid the conflict between asm-specifier for syscall number and
+# clobber list when issuing system call by inline assembly.
+CFLAGS="$CFLAGS -minline-asm-r15"
diff --git a/sysdeps/nds32/configure.ac b/sysdeps/nds32/configure.ac
new file mode 100644
index 0000000..c0e2494
--- /dev/null
+++ b/sysdeps/nds32/configure.ac
@@ -0,0 +1,10 @@ 
+GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
+# Local configure fragment for sysdeps/nds32.
+
+# For nds32 ABI for linux toolchain, the $r15 register is not only an 
+# assembler reserved register but also used to passing the sysem call
+# number. In order to ensure the data safety, $r15 is included in
+# clobber list by default. Using the option -minline-asm-r15 can
+# avoid the conflict between asm-specifier for syscall number and
+# clobber list when issuing system call by inline assembly.
+CFLAGS="$CFLAGS -minline-asm-r15"
diff --git a/sysdeps/nds32/nofpu/Implies b/sysdeps/nds32/nofpu/Implies
new file mode 100644
index 0000000..abcbadb
--- /dev/null
+++ b/sysdeps/nds32/nofpu/Implies
@@ -0,0 +1 @@ 
+ieee754/soft-fp
diff --git a/sysdeps/nds32/nptl/Makefile b/sysdeps/nds32/nptl/Makefile
new file mode 100644
index 0000000..6f553d6
--- /dev/null
+++ b/sysdeps/nds32/nptl/Makefile
@@ -0,0 +1,4 @@ 
+
+ifeq ($(subdir),csu)
+gen-as-const-headers += tcb-offsets.sym
+endif
diff --git a/sysdeps/nds32/preconfigure b/sysdeps/nds32/preconfigure
new file mode 100644
index 0000000..a5faf50
--- /dev/null
+++ b/sysdeps/nds32/preconfigure
@@ -0,0 +1,30 @@ 
+case "$machine" in
+nds32*)
+    endian_abi_type=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __NDS32_E\([B|L]*\)__ 1/\1/p'`
+    case "$endian_abi_type" in
+    L)
+       endian_abi_type=0
+       ;;
+    B)
+       echo "glibc does not yet support big-endian configuration" >&2
+       exit 1
+       ;;
+    esac
+
+    float_abi_type=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __NDS32_EXT_FPU_\([S|D]P*\) 1/\1/p' | wc -l`
+    case "$float_abi_type" in
+    0)
+       with_fp_cond=0
+       ;;
+    *)
+       echo "glibc does not yet support systems with FP instructions" >&2
+       exit 1
+       ;;
+    esac
+
+    base_machine=nds32
+    machine=nds32
+
+    $as_echo "#define NDS32_ABI_TYPE 0x$float_abi_type$endian_abi_type" >>confdefs.h
+    ;;
+esac
diff --git a/sysdeps/unix/sysv/linux/nds32/Implies b/sysdeps/unix/sysv/linux/nds32/Implies
new file mode 100644
index 0000000..91b4e1e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/Implies
@@ -0,0 +1,3 @@ 
+nds32/nptl
+unix/sysv/linux/generic/wordsize-32
+unix/sysv/linux/generic
diff --git a/sysdeps/unix/sysv/linux/nds32/Makefile b/sysdeps/unix/sysv/linux/nds32/Makefile
new file mode 100644
index 0000000..2709916
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/Makefile
@@ -0,0 +1,17 @@ 
+ifeq ($(subdir),misc)
+sysdep_headers += sys/cachectl.h
+sysdep_routines += cacheflush prctl mremap
+endif
+
+
+ifeq ($(subdir),stdlib)
+gen-as-const-headers += ucontext_i.sym
+endif
+
+ifeq ($(subdir),elf)
+sysdep_routines += dl-vdso
+ifeq ($(build-shared),yes)
+# This is needed for DSO loading from static binaries.
+sysdep-dl-routines += dl-static
+endif
+endif
diff --git a/sysdeps/unix/sysv/linux/nds32/Versions b/sysdeps/unix/sysv/linux/nds32/Versions
new file mode 100644
index 0000000..abe47ce
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/Versions
@@ -0,0 +1,11 @@ 
+ld {
+  GLIBC_PRIVATE {
+  # used for loading by static libraries
+    _dl_var_init;
+  }
+}
+libc {
+  GLIBC_2.28 {
+    cacheflush;
+  }
+}
diff --git a/sysdeps/unix/sysv/linux/nds32/configure b/sysdeps/unix/sysv/linux/nds32/configure
new file mode 100755
index 0000000..e815611
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/configure
@@ -0,0 +1,4 @@ 
+# This file is generated from configure.ac by Autoconf.  DO NOT EDIT!
+ # Local configure fragment for sysdeps/unix/sysv/linux/nds32.
+
+arch_minimum_kernel=4.16.0
diff --git a/sysdeps/unix/sysv/linux/nds32/configure.ac b/sysdeps/unix/sysv/linux/nds32/configure.ac
new file mode 100644
index 0000000..a5a0593
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/configure.ac
@@ -0,0 +1,4 @@ 
+GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
+# Local configure fragment for sysdeps/unix/sysv/linux/nds32.
+
+arch_minimum_kernel=4.16.0
diff --git a/sysdeps/unix/sysv/linux/nds32/shlib-versions b/sysdeps/unix/sysv/linux/nds32/shlib-versions
new file mode 100644
index 0000000..a94d2a4
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/shlib-versions
@@ -0,0 +1,7 @@ 
+DEFAULT			GLIBC_2.28
+
+%if NDS32_ABI_TYPE == 0
+ld=ld-linux-nds32le.so.1
+%else
+%error cannot determine ABI
+%endif