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.

5 files changed, 218 insertions, 0 deletions

diff --git a/include/ChangeLog b/include/ChangeLog
index b56b6ba..650f7c9 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,8 @@
+2018-07-30  Andrew Jenner  <andrew@codesourcery.com>
+
+	* elf/common.h (EM_CSKY, EM_CSKY_OLD): Define.
+	* elf/csky.h: New file.
+
 2018-07-27  Chenghua Xu  <paul.hua.gm@gmail.com>
 	    Maciej W. Rozycki  <macro@linux-mips.org>
 
diff --git a/include/dis-asm.h b/include/dis-asm.h
index 77b9e61..949ccde 100644
--- a/include/dis-asm.h
+++ b/include/dis-asm.h
@@ -300,6 +300,7 @@ extern void print_s390_disassembler_options (FILE *);
 extern void print_wasm32_disassembler_options (FILE *);
 extern bfd_boolean aarch64_symbol_is_valid (asymbol *, struct disassemble_info *);
 extern bfd_boolean arm_symbol_is_valid (asymbol *, struct disassemble_info *);
+extern bfd_boolean csky_symbol_is_valid (asymbol *, struct disassemble_info *);
 extern void disassemble_init_powerpc (struct disassemble_info *);
 extern void disassemble_init_s390 (struct disassemble_info *);
 extern void disassemble_init_wasm32 (struct disassemble_info *);
diff --git a/include/elf/common.h b/include/elf/common.h
index 3a6244d..1a940ff 100644
--- a/include/elf/common.h
+++ b/include/elf/common.h
@@ -340,6 +340,7 @@
 #define EM_LANAI	244	/* Lanai 32-bit processor.  */
 #define EM_BPF		247	/* Linux BPF – in-kernel virtual machine.  */
 #define EM_NFP		250	/* Netronome Flow Processor.  */
+#define EM_CSKY		252	/* C-SKY processor family.  */
 
 /* If it is necessary to assign new unofficial EM_* values, please pick large
    random numbers (0x8523, 0xa7f2, etc.) to minimize the chances of collision
@@ -435,6 +436,10 @@
 /* Old constant that might be in use by some software. */
 #define EM_OPENRISC		EM_OR1K
 
+/* C-SKY historically used 39, the same value as MCORE, from which the
+   architecture was derived.  */
+#define EM_CSKY_OLD		EM_MCORE
+
 /* See the above comment before you add a new EM_* value here.  */
 
 /* Values for e_version.  */
diff --git a/include/elf/csky.h b/include/elf/csky.h
new file mode 100644
index 0000000..1ccbd62
--- /dev/null
+++ b/include/elf/csky.h
@@ -0,0 +1,97 @@
+/* C-SKY ELF support for BFD.
+   Copyright (C) 1998-2018 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.  */
+
+#ifndef _ELF_CSKY_H
+#define _ELF_CSKY_H
+
+#include "elf/reloc-macros.h"
+
+/* Values of relocation types according to the ABI doc.
+   The order should be consistent with csky bfd reloc type
+   table in bfd-in2.h.  */
+START_RELOC_NUMBERS (elf_csky_reloc_type)
+    RELOC_NUMBER (R_CKCORE_NONE,0)
+    RELOC_NUMBER (R_CKCORE_ADDR32,1)
+    RELOC_NUMBER (R_CKCORE_PCREL_IMM8BY4,2)
+    RELOC_NUMBER (R_CKCORE_PCREL_IMM11BY2,3)
+    RELOC_NUMBER (R_CKCORE_PCREL_IMM4BY2,4)
+    RELOC_NUMBER (R_CKCORE_PCREL32,5)
+    RELOC_NUMBER (R_CKCORE_PCREL_JSR_IMM11BY2,6)
+    RELOC_NUMBER (R_CKCORE_GNU_VTINHERIT,7)
+    RELOC_NUMBER (R_CKCORE_GNU_VTENTRY,8)
+    RELOC_NUMBER (R_CKCORE_RELATIVE,9)
+    RELOC_NUMBER (R_CKCORE_COPY,10)
+    RELOC_NUMBER (R_CKCORE_GLOB_DAT,11)
+    RELOC_NUMBER (R_CKCORE_JUMP_SLOT,12)
+    RELOC_NUMBER (R_CKCORE_GOTOFF,13)
+    RELOC_NUMBER (R_CKCORE_GOTPC,14)
+    RELOC_NUMBER (R_CKCORE_GOT32,15)
+    RELOC_NUMBER (R_CKCORE_PLT32,16)
+    RELOC_NUMBER (R_CKCORE_ADDRGOT,17)
+    RELOC_NUMBER (R_CKCORE_ADDRPLT,18)
+    RELOC_NUMBER (R_CKCORE_PCREL_IMM26BY2,19)
+    RELOC_NUMBER (R_CKCORE_PCREL_IMM16BY2,20)
+    RELOC_NUMBER (R_CKCORE_PCREL_IMM16BY4,21)
+    RELOC_NUMBER (R_CKCORE_PCREL_IMM10BY2,22)
+    RELOC_NUMBER (R_CKCORE_PCREL_IMM10BY4,23)
+    RELOC_NUMBER (R_CKCORE_ADDR_HI16,24)
+    RELOC_NUMBER (R_CKCORE_ADDR_LO16,25)
+    RELOC_NUMBER (R_CKCORE_GOTPC_HI16,26)
+    RELOC_NUMBER (R_CKCORE_GOTPC_LO16,27)
+    RELOC_NUMBER (R_CKCORE_GOTOFF_HI16,28)
+    RELOC_NUMBER (R_CKCORE_GOTOFF_LO16,29)
+    RELOC_NUMBER (R_CKCORE_GOT12,30)
+    RELOC_NUMBER (R_CKCORE_GOT_HI16,31)
+    RELOC_NUMBER (R_CKCORE_GOT_LO16,32)
+    RELOC_NUMBER (R_CKCORE_PLT12,33)
+    RELOC_NUMBER (R_CKCORE_PLT_HI16,34)
+    RELOC_NUMBER (R_CKCORE_PLT_LO16,35)
+    RELOC_NUMBER (R_CKCORE_ADDRGOT_HI16,36)
+    RELOC_NUMBER (R_CKCORE_ADDRGOT_LO16,37)
+    RELOC_NUMBER (R_CKCORE_ADDRPLT_HI16,38)
+    RELOC_NUMBER (R_CKCORE_ADDRPLT_LO16,39)
+    RELOC_NUMBER (R_CKCORE_PCREL_JSR_IMM26BY2,40)
+    RELOC_NUMBER (R_CKCORE_TOFFSET_LO16, 41)
+    RELOC_NUMBER (R_CKCORE_DOFFSET_LO16, 42)
+    RELOC_NUMBER (R_CKCORE_PCREL_IMM18BY2, 43)
+    RELOC_NUMBER (R_CKCORE_DOFFSET_IMM18, 44)
+    RELOC_NUMBER (R_CKCORE_DOFFSET_IMM18BY2, 45)
+    RELOC_NUMBER (R_CKCORE_DOFFSET_IMM18BY4, 46)
+    RELOC_NUMBER (R_CKCORE_GOTOFF_IMM18, 47)
+    RELOC_NUMBER (R_CKCORE_GOT_IMM18BY4, 48)
+    RELOC_NUMBER (R_CKCORE_PLT_IMM18BY4, 49)
+    RELOC_NUMBER (R_CKCORE_PCREL_IMM7BY4, 50)
+    RELOC_NUMBER (R_CKCORE_TLS_LE32, 51)
+    RELOC_NUMBER (R_CKCORE_TLS_IE32, 52)
+    RELOC_NUMBER (R_CKCORE_TLS_GD32, 53)
+    RELOC_NUMBER (R_CKCORE_TLS_LDM32, 54)
+    RELOC_NUMBER (R_CKCORE_TLS_LDO32, 55)
+    RELOC_NUMBER (R_CKCORE_TLS_DTPMOD32, 56)
+    RELOC_NUMBER (R_CKCORE_TLS_DTPOFF32, 57)
+    RELOC_NUMBER (R_CKCORE_TLS_TPOFF32, 58)
+    RELOC_NUMBER (R_CKCORE_PCREL_FLRW_IMM8BY4, 59)
+    RELOC_NUMBER (R_CKCORE_NOJSRI, 60)
+    RELOC_NUMBER (R_CKCORE_CALLGRAPH, 61)
+    RELOC_NUMBER (R_CKCORE_IRELATIVE, 62)
+    RELOC_NUMBER (R_CKCORE_PCREL_BLOOP_IMM4BY4, 63)
+    RELOC_NUMBER (R_CKCORE_PCREL_BLOOP_IMM12BY4, 64)
+END_RELOC_NUMBERS (R_CKCORE_MAX)
+
+#endif /* _ELF_CSKY_H  */
diff --git a/include/opcode/csky.h b/include/opcode/csky.h
new file mode 100644
index 0000000..9b193b6
--- /dev/null
+++ b/include/opcode/csky.h
@@ -0,0 +1,110 @@
+/* C-SKY assembler/disassembler support.
+   Copyright (C) 2004-2018 Free Software Foundation, Inc.
+   Contributed by C-SKY Microsystems and Mentor Graphics.
+
+   This file is part of GDB and GAS.
+
+   GDB and GAS are 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, or (at
+   your option) any later version.
+
+   GDB and GAS are 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 GDB or GAS; see the file COPYING3.  If not, write to the
+   Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+#include "dis-asm.h"
+
+/* The following bitmasks control instruction set architecture.  */
+#define CSKYV1_ISA_E1       (1 << 0)
+#define CSKYV2_ISA_E1       (1 << 1)
+#define CSKYV2_ISA_1E2      (1 << 2)
+#define CSKYV2_ISA_2E3      (1 << 3)
+#define CSKYV2_ISA_3E7      (1 << 4)
+#define CSKYV2_ISA_7E10     (1 << 5)
+#define CSKYV2_ISA_3E3R1    (1 << 6)
+
+#define CSKY_ISA_TRUST      (1 << 11)
+#define CSKY_ISA_CACHE      (1 << 12)
+#define CSKY_ISA_NVIC       (1 << 13)
+#define CSKY_ISA_CP         (1 << 14)
+#define CSKY_ISA_MP         (1 << 15)
+#define CSKY_ISA_MP_1E2     (1 << 16)
+#define CSKY_ISA_JAVA       (1 << 17)
+#define CSKY_ISA_MAC        (1 << 18)
+#define CSKY_ISA_MAC_DSP    (1 << 19)
+
+/* Base ISA for csky v1 and v2.  */
+#define CSKY_ISA_DSP        (1 << 20)
+#define CSKY_ISA_DSP_1E2    (1 << 21)
+#define CSKY_ISA_DSP_ENHANCE (1 << 22)
+
+/* Base float instruction (803f & 810f).  */
+#define CSKY_ISA_FLOAT_E1   (1 << 25)
+/* M_FLOAT support (810f).  */
+#define CSKY_ISA_FLOAT_1E2  (1 << 26)
+/* 803 support (803f).  */
+#define CSKY_ISA_FLOAT_1E3  (1 << 27)
+/* 807 support (803f & 807f).  */
+#define CSKY_ISA_FLOAT_3E4  (1 << 28)
+/* Vector DSP support.  */
+#define CSKY_ISA_VDSP       (1 << 29)
+
+/* The following bitmasks control cpu architecture for CSKY.  */
+#define CSKY_ABI_V1         (1 << 28)
+#define CSKY_ABI_V2         (2 << 28)
+#define CSKY_ARCH_MASK      0x0000001F
+#define CSKY_ABI_MASK       0xF0000000
+
+#define CSKY_ARCH_510       0x1
+#define CSKY_ARCH_610       0x2
+#define CSKY_ARCH_801       0xa
+#define CSKY_ARCH_802       0x10
+#define CSKY_ARCH_803       0x9
+#define CSKY_ARCH_807       0x6
+#define CSKY_ARCH_810       0x8
+
+#define CSKY_ARCH_MAC       (1 << 15)
+#define CSKY_ARCH_DSP       (1 << 14)
+#define CSKY_ARCH_FLOAT     (1 << 13)
+#define CSKY_ARCH_SIMD      (1 << 12)
+#define CSKY_ARCH_CP        (1 << 11)
+#define CSKY_ARCH_MP        (1 << 10)
+#define CSKY_ARCH_CACHE     (1 << 9)
+#define CSKY_ARCH_JAVA      (1 << 8)
+#define CSKY_ARCH_APS       (1 << 7)
+
+#define IS_CSKY_V1(a) \
+  (((a) & CSKY_ABI_MASK) == CSKY_ABI_V1)
+#define IS_CSKY_V2(a) \
+  (((a) & CSKY_ABI_MASK) == CSKY_ABI_V2)
+#define IS_CSKY_ARCH_V1(a) \
+  (((a) & CSKY_ARCH_MASK) == CSKY_ARCH_510				\
+   || ((a) & CSKY_ARCH_MASK) == CSKY_ARCH_610)
+#define IS_CSKY_ARCH_V2(a)  \
+  (!(IS_CSKY_ARCH_V1 (a)))
+
+#define IS_CSKY_ARCH_510(a)	(((a) & CSKY_ARCH_MASK) == CSKY_ARCH_510)
+#define IS_CSKY_ARCH_610(a)	(((a) & CSKY_ARCH_MASK) == CSKY_ARCH_610)
+#define IS_CSKY_ARCH_801(a)	(((a) & CSKY_ARCH_MASK) == CSKY_ARCH_801)
+#define IS_CSKY_ARCH_802(a)	(((a) & CSKY_ARCH_MASK) == CSKY_ARCH_802)
+#define IS_CSKY_ARCH_803(a)	(((a) & CSKY_ARCH_MASK) == CSKY_ARCH_803)
+#define IS_CSKY_ARCH_807(a)	(((a) & CSKY_ARCH_MASK) == CSKY_ARCH_807)
+#define IS_CSKY_ARCH_810(a)	(((a) & CSKY_ARCH_MASK) == CSKY_ARCH_810)
+
+#define CPU_ARCH_MASK \
+  (CSKY_ARCH_JAVA | CSKY_ARCH_FLOAT | CSKY_ARCH_DSP | CSKY_ARCH_MASK)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+extern int print_insn_csky (bfd_vma memaddr, struct disassemble_info *info);
+#ifdef __cplusplus
+}
+#endif