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.

1 files changed, 59 insertions, 0 deletions

diff --git a/bfd/cpu-csky.c b/bfd/cpu-csky.c
new file mode 100644
index 0000000..a8f251d
--- /dev/null
+++ b/bfd/cpu-csky.c
@@ -0,0 +1,59 @@
+/* BFD support for C-SKY processors.
+   Copyright (C) 1994-2018 Free Software Foundation, Inc.
+   Contributed by C-SKY Microsystems and Mentor Graphics.
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+#include "sysdep.h"
+#include "bfd.h"
+#include "libbfd.h"
+
+#define N(NUMBER, PRINT, ISDEFAULT, NEXT)  \
+{                                                                      \
+  32,                     /* 32 bits in a word */                      \
+  32,                     /* 32 bits in an address */                  \
+  8,                      /* 8 bits in a byte */                       \
+  bfd_arch_csky,          /* Architecture */                           \
+  NUMBER,                 /* Machine number */                         \
+  "csky",                 /* Architecture name */                      \
+  PRINT,                  /* Printable name */                         \
+  3,                      /* Section align power */                    \
+  ISDEFAULT,              /* Is this the default architecture ? */     \
+  bfd_default_compatible, /* Architecture comparison function */       \
+  bfd_default_scan,       /* String to architecture conversion */      \
+  bfd_arch_default_fill,                                               \
+  NEXT                    /* Next in list */                           \
+}
+
+static const bfd_arch_info_type arch_info_struct[] =
+{
+  /* ABI v1 processors. */
+  N (bfd_mach_ck510,   "csky:ck510",    FALSE, & arch_info_struct[1]),
+  N (bfd_mach_ck610,   "csky:ck610",    FALSE, & arch_info_struct[2]),
+
+  /* ABI v2 processors.  */
+  N (bfd_mach_ck801,   "csky:ck801",    FALSE, & arch_info_struct[3]),
+  N (bfd_mach_ck802,   "csky:ck802",    FALSE, & arch_info_struct[4]),
+  N (bfd_mach_ck803,   "csky:ck803",    FALSE, & arch_info_struct[5]),
+  N (bfd_mach_ck807,   "csky:ck807",    FALSE, & arch_info_struct[6]),
+  N (bfd_mach_ck810,   "csky:ck810",    FALSE, & arch_info_struct[7]),
+  N (bfd_mach_ck_unknown, "csky:any",   FALSE, NULL)
+};
+
+const bfd_arch_info_type bfd_csky_arch =
+  N (0, "csky", TRUE, & arch_info_struct[0]);