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, 80 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/kvx/bits/syscalls.h b/libc/sysdeps/linux/kvx/bits/syscalls.h
new file mode 100644
index 000000000..71bd5e4fe
--- /dev/null
+++ b/libc/sysdeps/linux/kvx/bits/syscalls.h
@@ -0,0 +1,80 @@
+/*
+ * 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 _BITS_SYSCALLS_H
+#define _BITS_SYSCALLS_H
+#ifndef _SYSCALL_H
+# error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
+#endif
+
+#ifndef __ASSEMBLER__
+
+#define INTERNAL_SYSCALL_NCS(name, err, nr, args...)                    \
+ 	({									\
+		register long _ret __asm__("r0");			\
+		register unsigned long _scno  __asm__("r6") = name;	\
+		LOAD_ARGS_##nr (args)					\
+		__asm__ __volatile__("scall %[r_scno]"			\
+				     : "=r" (_ret)			\
+				     : [r_scno] "r" (_scno) ASM_ARGS_##nr \
+				     : ASM_CLOBBER_##nr);		\
+		_ret;							\
+	})
+
+/* Mark all argument registers as per ABI in the range r1-r5 as
+   clobbered when they are not used for the invocation of the scall */
+#define ASM_CLOBBER_6 "cc", "memory",					\
+    "r7", "r8", "r9", "r10", "r11", /* unused argument registers */ \
+    "r15", /* struct pointer */						\
+    "r16", "r17", /* veneer registers */				\
+    "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39", /* 32->63 are caller-saved */ \
+    "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47",		\
+    "r48", "r49", "r50", "r51", "r52", "r53", "r54", "r55",		\
+    "r56", "r57", "r58", "r59", "r60", "r61", "r62", "r63"
+#define ASM_CLOBBER_5 "r5", ASM_CLOBBER_6
+#define ASM_CLOBBER_4 "r4", ASM_CLOBBER_5
+#define ASM_CLOBBER_3 "r3", ASM_CLOBBER_4
+#define ASM_CLOBBER_2 "r2", ASM_CLOBBER_3
+#define ASM_CLOBBER_1 "r1", ASM_CLOBBER_2
+#define ASM_CLOBBER_0 ASM_CLOBBER_1
+
+#define LOAD_ARGS_0()
+#define ASM_ARGS_0
+
+#define LOAD_ARGS_1(a1)                                 \
+	LOAD_ARGS_0();					\
+	_ret  = (long) a1;
+#define ASM_ARGS_1      ASM_ARGS_0, "r"(_ret)
+
+#define LOAD_ARGS_2(a1, a2)                             \
+	LOAD_ARGS_1(a1);				\
+	register long _a2 __asm__("r1") = (long) a2;
+#define ASM_ARGS_2      ASM_ARGS_1, "r"(_a2)
+
+#define LOAD_ARGS_3(a1, a2, a3)                         \
+	LOAD_ARGS_2(a1, a2);				\
+	register long _a3 __asm__("r2") = (long) a3;
+#define ASM_ARGS_3      ASM_ARGS_2, "r"(_a3)
+
+#define LOAD_ARGS_4(a1, a2, a3, a4)                     \
+	LOAD_ARGS_3(a1, a2, a3);			\
+	register long _a4 __asm__("r3") = (long) a4;
+#define ASM_ARGS_4      ASM_ARGS_3, "r"(_a4)
+
+#define LOAD_ARGS_5(a1, a2, a3, a4, a5)                 \
+	LOAD_ARGS_4(a1, a2, a3, a4);			\
+	register long _a5 __asm__("r4") = (long) a5;
+#define ASM_ARGS_5      ASM_ARGS_4, "r"(_a5)
+
+#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6)             \
+	LOAD_ARGS_5(a1, a2, a3, a4, a5);		\
+	register long _a6 __asm__("r5") = (long) a6;
+#define ASM_ARGS_6      ASM_ARGS_5, "r"(_a6)
+
+#endif /* __ASSEMBLER__ */
+#endif /* _BITS_SYSCALLS_H */