RISC-V: Add configure support for riscv*-linux*.

This adds the target and native configure support, and the NEWS entries for
the new target and native configurations.

	gdb/
	* Makefile.in (ALL_TARGET_OBS): Add riscv-linux-tdep.c.
	(ALLDEPFILES): Add riscv-linux-nat.c, and riscv-linux-tdep.c.
	* NEWS: Mention new GNU/Linux RISC-V target.
	* configure.host: Add riscv*-*-linux*.
	* configure.nat: Add riscv*.
	* configure.tgt: Add riscv*-*-linux*.

gdb/ChangeLog

@@ -1,5 +1,11 @@
 2018-08-09  Jim Wilson  <jimw@sifive.com>
 
+	* Makefile.in (ALL_TARGET_OBS): Add riscv-linux-tdep.c.
+	(ALLDEPFILES): Add riscv-linux-nat.c, and riscv-linux-tdep.c.
+	* NEWS: Mention new GNU/Linux RISC-V target.
+	* configure.host: Add riscv*-*-linux*.
+	* configure.nat: Add riscv*.
+	* configure.tgt: Add riscv*-*-linux*.
 	* riscv-linux-nat.c: New file.
 	* riscv-linux-tdep.c: New file.
 

gdb/Makefile.in

@@ -753,6 +753,7 @@ ALL_TARGET_OBS = \
 	ppc-sysv-tdep.o \
 	ppc64-tdep.o \
 	ravenscar-thread.o \
+	riscv-linux-tdep.o \
 	riscv-tdep.o \
 	rl78-tdep.o \
 	rs6000-aix-tdep.o \
@@ -2304,6 +2305,8 @@ ALLDEPFILES = \
 	procfs.c \
 	ravenscar-thread.c \
 	remote-sim.c \
+	riscv-linux-nat.c \
+	riscv-linux-tdep.c \
 	riscv-tdep.c \
 	rl78-tdep.c \
 	rs6000-lynx178-tdep.c \

gdb/NEWS

@@ -41,6 +41,14 @@ thread apply [all | COUNT | -COUNT] [FLAG]... COMMAND
   FLAG arguments allow to control what output to produce and how to handle
   errors raised when applying COMMAND to a thread.
 
+* New native configurations
+
+GNU/Linux/RISC-V		riscv*-*-linux*
+
+* New targets
+
+GNU/Linux/RISC-V		riscv*-*-linux*
+
 *** Changes in GDB 8.2
 
 * The 'set disassembler-options' command now supports specifying options

gdb/configure.host

@@ -149,6 +149,8 @@ powerpc64*-*-linux*)	gdb_host=ppc64-linux
 			;;
 powerpc*-*-linux*)	gdb_host=linux ;;
 
+riscv*-*-linux*)	gdb_host=linux ;;
+
 s390*-*-linux*)		gdb_host=linux ;;
 
 sh*-*-netbsdelf* | sh*-*-knetbsd*-gnu)

gdb/configure.nat

@@ -267,6 +267,10 @@ case ${gdb_host} in
 		# Host: PowerPC, running Linux
 		NATDEPFILES="${NATDEPFILES} ppc-linux-nat.o ppc-linux.o"
 		;;
+	    riscv*)
+		# Host: RISC-V, running Linux
+		NATDEPFILES="${NATDEPFILES} riscv-linux-nat.o"
+		;;
 	    s390)
 		# Host: S390, running Linux
 		NATDEPFILES="${NATDEPFILES} s390-linux-nat.o"

gdb/configure.tgt

@@ -517,6 +517,12 @@ s390*-*-linux*)
 	build_gdbserver=yes
 	;;
 
+riscv*-*-linux*)
+	# Target: Linux/RISC-V
+	gdb_target_obs="riscv-linux-tdep.o riscv-tdep.o glibc-tdep.o \
+ 			linux-tdep.o solib-svr4.o symfile-mem.o linux-record.o"
+	;;
+
 riscv*-*-*)
 	# Target: RISC-V architecture
 	gdb_target_obs="riscv-tdep.o"