kvx: add support for kvx arch to uClibc-ng

This commit adds support for Kalray VLIW family (kvx)

Kalray kv3 core is embedded in Kalray Coolidge SoC. This core which is the
third of the KV family has the following features:

    32/64 bits execution mode
    6-issue VLIW architecture
    64 x 64bits general purpose registers
    SIMD instructions
    little-endian

In order to build a usable toolchain, build scripts are provided at the
following address: https://github.com/kalray/build-scripts.

Kalray uses FOSS which is available at https://github.com/kalray
This includes Linux kernel, uClibc-ng, gcc, binutils, etc.

Signed-off-by: Clément Léger <cleger@kalray.eu>
Signed-off-by: Guillaume Thouvenin <gthouvenin@kalray.eu>
Signed-off-by: Laurent Thevenoux <lthevenoux@kalray.eu>
Signed-off-by: Marc Poulhies <mpoulhies@kalray.eu>
Signed-off-by: Marius Gligor <mgligor@kalray.eu>
Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>

1 files changed, 99 insertions, 0 deletions

diff --git a/ldso/ldso/kvx/dl-sysdep.h b/ldso/ldso/kvx/dl-sysdep.h
new file mode 100644
index 000000000..9bb20ca8e
--- /dev/null
+++ b/ldso/ldso/kvx/dl-sysdep.h
@@ -0,0 +1,99 @@
+/*
+ * Various assembly language/system dependent hacks that are required
+ * so that we can minimize the amount of platform specific code.
+ * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 2017-2018 by Waldemar Brodkorb <wbx@uclibc-ng.org>
+ * Copyright (C) 2018 Kalray Inc.
+
+ * Ported from GNU C Library
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1995-2017 Free Software Foundation, Inc.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Defines that this system uses RELOCA.  */
+#define ELF_USES_RELOCA
+
+#include <elf.h>
+#include <link.h>
+
+/* Initialization sequence for the GOT.  */
+#define INIT_GOT(GOT_BASE,MODULE) \
+{				\
+  GOT_BASE[2] = (unsigned long) _dl_linux_resolve; \
+  GOT_BASE[1] = (unsigned long) MODULE; \
+}
+
+/* Here we define the magic numbers that this dynamic loader should accept */
+#define MAGIC1 EM_KVX
+#undef  MAGIC2
+
+/* Used for error messages */
+#define ELF_TARGET "kvx"
+
+#define ARCH_NEEDS_BOOTSTRAP_RELOCS
+
+struct elf_resolve;
+unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
+
+#define elf_machine_type_class(type)			      \
+  ((((type) == R_KVX_JMP_SLOT || (type) == R_KVX_64_DTPMOD || \
+     (type) == R_KVX_64_DTPOFF                                \
+  || (type) == R_KVX_64_TPOFF)			              \
+    * ELF_RTYPE_CLASS_PLT)			 	      \
+   | (((type) == R_KVX_COPY) * ELF_RTYPE_CLASS_COPY))
+
+/* Return the link-time address of _DYNAMIC.  Conveniently, this is the
+   first element of the GOT. */
+extern const ElfW(Addr) _GLOBAL_OFFSET_TABLE_[] attribute_hidden;
+static __always_inline ElfW(Addr) __attribute__ ((unused))
+elf_machine_dynamic (void)
+{
+  unsigned long *ptr;
+  __asm__("\n"
+	"pcrel %0 = @gotaddr()\n"
+	";;\n" : "=r"(ptr) :: );
+  return *ptr;
+}
+
+/* Return the run-time load address of the shared object.  */
+
+static __always_inline ElfW(Addr) __attribute__ ((unused))
+elf_machine_load_address (void)
+{
+  /* To figure out the load address we use the definition that for any symbol:
+     dynamic_addr(symbol) = static_addr(symbol) + load_addr
+
+    _DYNAMIC sysmbol is used here as its link-time address stored in
+    the special unrelocated first GOT entry.  */
+
+    extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
+    return (ElfW(Addr)) &_DYNAMIC - elf_machine_dynamic ();
+}
+
+static __always_inline void
+elf_machine_relative(Elf64_Addr load_off, const Elf64_Addr rel_addr,
+                     Elf64_Word relative_count)
+{
+	Elf64_Rela *rpnt = (Elf64_Rela*)rel_addr;
+	--rpnt;
+	do {
+		Elf64_Addr *const reloc_addr = (Elf64_Addr*)(load_off + (++rpnt)->r_offset);
+
+		*reloc_addr = load_off + rpnt->r_addend;
+	} while (--relative_count);
+}