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>

4 files changed, 178 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/kvx/sys/cachectl.h b/libc/sysdeps/linux/kvx/sys/cachectl.h
new file mode 100644
index 000000000..707de263e
--- /dev/null
+++ b/libc/sysdeps/linux/kvx/sys/cachectl.h
@@ -0,0 +1,21 @@
+/*
+ * This file is subject to the terms and conditions of the LGPL V2.1
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2020 Kalray Inc.
+ */
+
+#ifndef _SYS_CACHECTL_H
+#define _SYS_CACHECTL_H	1
+
+#include <asm/cachectl.h>
+
+__BEGIN_DECLS
+
+extern int cachectl(void *addr, size_t len, unsigned long cache,
+		    unsigned long flags);
+
+__END_DECLS
+
+#endif
diff --git a/libc/sysdeps/linux/kvx/sys/procfs.h b/libc/sysdeps/linux/kvx/sys/procfs.h
new file mode 100644
index 000000000..bbbfb838e
--- /dev/null
+++ b/libc/sysdeps/linux/kvx/sys/procfs.h
@@ -0,0 +1,101 @@
+/* Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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; see the file COPYING.LIB.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_PROCFS_H
+#define _SYS_PROCFS_H	1
+
+/* This is somewhat modelled after the file of the same name on SVR4
+   systems.  It provides a definition of the core file format for ELF
+   used on Linux.  It doesn't have anything to do with the /proc file
+   system, even though Linux has one.
+
+   Anyway, the whole purpose of this file is for GDB and GDB only.
+   Don't read too much into it.  Don't use it for anything other than
+   GDB unless you know what you are doing.  */
+
+#include <features.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/user.h>
+
+__BEGIN_DECLS
+
+/* Type for a general-purpose register.  */
+typedef unsigned long elf_greg_t;
+/* No FP registers for kvx. */
+typedef struct {} elf_fpregset_t;
+
+/* And the whole bunch of them.  We could have used `struct
+   pt_regs' directly in the typedef, but tradition says that
+   the register set is an array, which does have some peculiar
+   semantics, so leave it that way.  */
+#define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof(elf_greg_t))
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+/* Signal info.  */
+struct elf_siginfo
+  {
+    int si_signo;			/* Signal number.  */
+    int si_code;			/* Extra code.  */
+    int si_errno;			/* Errno.  */
+  };
+
+/* Definitions to generate Intel SVR4-like core files.  These mostly
+   have the same names as the SVR4 types with "elf_" tacked on the
+   front to prevent clashes with Linux definitions, and the typedef
+   forms have been avoided.  This is mostly like the SVR4 structure,
+   but more Linuxy, with things that Linux does not support and which
+   GDB doesn't really use excluded.  */
+
+struct elf_prstatus
+  {
+    short int pr_cursig;		/* Current signal.  */
+    __pid_t pr_pid;
+    elf_gregset_t pr_reg;		/* GP registers.  */
+  };
+
+
+#define ELF_PRARGSZ     (80)    /* Number of chars for args.  */
+
+struct elf_prpsinfo
+  {
+    char pr_fname[16];			/* Filename of executable.  */
+    char pr_psargs[ELF_PRARGSZ];	/* Initial part of arg list.  */
+  };
+
+/* The rest of this file provides the types for emulation of the
+   Solaris <proc_service.h> interfaces that should be implemented by
+   users of libthread_db.  */
+
+/* Addresses.  */
+typedef void *psaddr_t;
+
+/* Register sets.  Linux has different names.  */
+typedef elf_gregset_t prgregset_t;
+typedef elf_fpregset_t prfpregset_t;
+
+/* We don't have any differences between processes and threads,
+   therefore have only one PID type.  */
+typedef __pid_t lwpid_t;
+
+/* Process status and info.  In the end we do provide typedefs for them.  */
+typedef struct elf_prstatus prstatus_t;
+typedef struct elf_prpsinfo prpsinfo_t;
+
+__END_DECLS
+
+#endif	/* sys/procfs.h */
diff --git a/libc/sysdeps/linux/kvx/sys/ucontext.h b/libc/sysdeps/linux/kvx/sys/ucontext.h
new file mode 100644
index 000000000..548892389
--- /dev/null
+++ b/libc/sysdeps/linux/kvx/sys/ucontext.h
@@ -0,0 +1,29 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2018 Kalray Inc.
+ */
+
+#ifndef _SYS_UCONTEXT_H
+#define _SYS_UCONTEXT_H	1
+
+#include <signal.h>
+#include <bits/sigcontext.h>
+
+/* Type for general register.  */
+typedef unsigned long greg_t;
+
+/* Number of general registers.  */
+#define NGREG	64
+
+typedef struct ucontext {
+	unsigned long	  uc_flags;
+	struct ucontext  *uc_link;
+	stack_t		  uc_stack;
+	struct sigcontext uc_mcontext;
+	sigset_t	  uc_sigmask;	/* mask last for extensibility */
+} ucontext_t;
+
+#endif /* sys/ucontext.h */
diff --git a/libc/sysdeps/linux/kvx/sys/user.h b/libc/sysdeps/linux/kvx/sys/user.h
new file mode 100644
index 000000000..2e228ff19
--- /dev/null
+++ b/libc/sysdeps/linux/kvx/sys/user.h
@@ -0,0 +1,27 @@
+/*
+ * This file is subject to the terms and conditions of the LGPL V2.1
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2019 Kalray Inc.
+ */
+
+#ifndef _SYS_USER_H
+#define _SYS_USER_H	1
+
+struct user_regs_struct
+{
+  /* GPR */
+  unsigned long long gpr_regs[64];
+
+  /* SFR */
+  unsigned long lc; 
+  unsigned long le; 
+  unsigned long ls; 
+  unsigned long ra; 
+
+  unsigned long cs; 
+  unsigned long spc;
+};
+
+#endif