Add support for the C_SKY series of processors.

This patch series is a new binutils port for C-SKY processors, including support for both the V1 and V2 processor variants.  V1 is derived from the MCore architecture while V2 is substantially different, with mixed 16- and 32-bit instructions, a larger register set, a different (but overlapping) ABI, etc.  There is support for bare-metal ELF targets and Linux with both glibc and uClibc.

This code is being contributed jointly by C-SKY Microsystems and Mentor Graphics.  C-SKY is responsible for the technical content and has proposed Lifang Xia and Yunhai Shang as port maintainers.  (Note that C-SKY does have a corporate copyright assignment on file with the FSF.) Mentor Graphics' role has been cleaning up the code, adding documentation and additional test cases, etc, to address issues we anticipated reviewers would complain about.

bfd     * Makefile.am (ALL_MACHINES, ALL_MACHINES_CFILES): Add C-SKY.
        (BFD32_BACKENDS, BFD_BACKENDS_CFILES): Likewise.
        * Makefile.in: Regenerated.
        * archures.c (enum bfd_architecture): Add bfd_arch_csky and
        related bfd_mach defines.
        (bfd_csky_arch): Declare.
        (bfd_archures_list): Add C-SKY.
        * bfd-in.h (elf32_csky_build_stubs): Declare.
        (elf32_csky_size_stubs): Declare.
        (elf32_csky_next_input_section: Declare.
        (elf32_csky_setup_section_lists): Declare.
        * bfd-in2.h: Regenerated.
        * config.bfd: Add C-SKY.
        * configure.ac: Likewise.
        * configure: Regenerated.
        * cpu-csky.c: New file.
        * elf-bfd.h (enum elf_target_id): Add C-SKY.
        * elf32-csky.c: New file.
        * libbfd.h: Regenerated.
        * reloc.c: Add C-SKY relocations.
        * targets.c (csky_elf32_be_vec, csky_elf32_le_vec): Declare.
        (_bfd_target_vector): Add C-SKY target vector entries.

binutils* readelf.c: Include elf/csky.h.
        (guess_is_rela): Handle EM_CSKY.
        (dump_relocations): Likewise.
        (get_machine_name): Likewise.
        (is_32bit_abs_reloc): Likewise.

include  * dis-asm.h (csky_symbol_is_valid): Declare.
         * opcode/csky.h: New file.

opcodes  * Makefile.am (TARGET_LIBOPCODES_CFILES): Add csky-dis.c.
         * Makefile.in: Regenerated.
         * configure.ac: Add C-SKY.
         * configure: Regenerated.
         * csky-dis.c: New file.
         * csky-opc.h: New file.
         * disassemble.c (ARCH_csky): Define.
         (disassembler, disassemble_init_for_target): Add case for ARCH_csky.
         * disassemble.h (print_insn_csky, csky_get_disassembler): Declare.

gas      * Makefile.am (TARGET_CPU_CFILES): Add entry for C-SKY.
         (TARGET_CPU_HFILES, TARGET_ENV_HFILES): Likewise.
         * Makefile.in: Regenerated.
         * config/tc-csky.c: New file.
         * config/tc-csky.h: New file.
         * config/te-csky_abiv1.h: New file.
         * config/te-csky_abiv1_linux.h: New file.
         * config/te-csky_abiv2.h: New file.
         * config/te-csky_abiv2_linux.h: New file.
         * configure.tgt: Add C-SKY.
         * doc/Makefile.am (CPU_DOCS): Add entry for C-SKY.
         * doc/Makefile.in: Regenerated.
         * doc/all.texi: Set CSKY feature.
         * doc/as.texi (Overview): Add C-SKY options.
         (Machine Dependencies): Likewise.
         * doc/c-csky.texi: New file.
         * testsuite/gas/csky/*: New test cases.

ld      * Makefile.am (ALL_EMULATION_SOURCES): Add C-SKY emulations.
        (ecskyelf.c, ecskyelf_linux.c): New rules.
        * Makefile.in: Regenerated.
        * configure.tgt: Add C-SKY.
        * emulparams/cskyelf.sh: New file.
        * emulparams/cskyelf_linux.sh: New file.
        * emultempl/cskyelf.em: New file.
        * gen-doc.texi: Add C-SKY.
        * ld.texi: Likewise.
        (Options specific to C-SKY targets): New section.
        * testsuite/ld-csky/*: New tests.

2 files changed, 17 insertions, 0 deletions

diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index b40b267..35c04b4 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,11 @@
+2018-07-30  Andrew Jenner  <andrew@codesourcery.com>
+
+	* readelf.c: Include elf/csky.h.
+	(guess_is_rela): Handle EM_CSKY.
+	(dump_relocations): Likewise.
+	(get_machine_name): Likewise.
+	(is_32bit_abs_reloc): Likewise.
+
 2018-07-25  Nick Clifton  <nickc@redhat.com>
 
 	* rdcoff.c (parse_coff_struct_type): Free fields array upon early
diff --git a/binutils/readelf.c b/binutils/readelf.c
index fe8560c..90dbdf7 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -98,6 +98,7 @@
 #include "elf/cr16.h"
 #include "elf/cris.h"
 #include "elf/crx.h"
+#include "elf/csky.h"
 #include "elf/d10v.h"
 #include "elf/d30v.h"
 #include "elf/dlx.h"
@@ -797,6 +798,7 @@ guess_is_rela (unsigned int e_machine)
     case EM_CR16:
     case EM_CRIS:
     case EM_CRX:
+    case EM_CSKY:
     case EM_D30V:
     case EM_CYGNUS_D30V:
     case EM_FR30:
@@ -1348,6 +1350,10 @@ dump_relocations (Filedata *          filedata,
 	  rtype = elf_frv_reloc_type (type);
 	  break;
 
+	case EM_CSKY:
+	  rtype = elf_csky_reloc_type (type);
+	  break;
+
 	case EM_FT32:
 	  rtype = elf_ft32_reloc_type (type);
 	  break;
@@ -2501,6 +2507,7 @@ get_machine_name (unsigned e_machine)
     case EM_ADAPTEVA_EPIPHANY:	return "Adapteva EPIPHANY";
     case EM_CYGNUS_FRV:		return "Fujitsu FR-V";
     case EM_S12Z:               return "Freescale S12Z";
+    case EM_CSKY:		return "C-SKY";
 
     default:
       snprintf (buff, sizeof (buff), _("<unknown>: 0x%x"), e_machine);
@@ -12307,6 +12314,8 @@ is_32bit_abs_reloc (Filedata * filedata, unsigned int reloc_type)
       return reloc_type == 3; /* R_CR16_NUM32.  */
     case EM_CRX:
       return reloc_type == 15; /* R_CRX_NUM32.  */
+    case EM_CSKY:
+      return reloc_type == 1; /* R_CKCORE_ADDR32.  */
     case EM_CYGNUS_FRV:
       return reloc_type == 1;
     case EM_CYGNUS_D10V: