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, 24 insertions, 0 deletions

diff --git a/libm/kvx/feraiseexcept.c b/libm/kvx/feraiseexcept.c
new file mode 100644
index 000000000..156bf66cf
--- /dev/null
+++ b/libm/kvx/feraiseexcept.c
@@ -0,0 +1,24 @@
+/*
+  (C) Copyright 2019 Kalray S.A.
+  This file provides feraiseexcept for the Coolidge processor.
+*/
+
+#include <fenv.h>
+
+int feraiseexcept(int excepts)
+{
+  /* Mask excepts to be sure only supported flag bits are set */
+  excepts &= FE_ALL_EXCEPT;
+
+  /* Set $cs with 'excepts' as a set mask. */
+  __builtin_kvx_wfxl(KVX_SFR_CS, (long long)excepts << 32);
+
+  /* C99 requirements are met. The flags are raised at the same time
+     so order is preserved. FE_INEXACT is not raised if one of the
+     exceptions is FE_OVERFLOW or FE_UNDERFLOW. */
+
+  /* The above insn cannot fail (while the OS allows access to the
+     floating-point exception flags of the $cs register). Return
+     success. */
+  return 0;
+}