risc-v: initial 64 bit port, static only (no TLS/NPTL)

Only a simple hello world is tested in qemu system emulation.

1 files changed, 73 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/riscv64/bits/fenv.h b/libc/sysdeps/linux/riscv64/bits/fenv.h
new file mode 100644
index 000000000..a3f8031af
--- /dev/null
+++ b/libc/sysdeps/linux/riscv64/bits/fenv.h
@@ -0,0 +1,73 @@
+/* Floating point environment, RISC-V version.
+   Copyright (C) 1998-2018 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/>.  */
+
+#ifndef _FENV_H
+# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
+#endif
+
+enum
+  {
+    FE_INEXACT   =
+#define FE_INEXACT	(0x01)
+      FE_INEXACT,
+    FE_UNDERFLOW =
+#define FE_UNDERFLOW	(0x02)
+      FE_UNDERFLOW,
+    FE_OVERFLOW  =
+#define FE_OVERFLOW	(0x04)
+      FE_OVERFLOW,
+    FE_DIVBYZERO =
+#define FE_DIVBYZERO	(0x08)
+      FE_DIVBYZERO,
+    FE_INVALID   =
+#define FE_INVALID	(0x10)
+      FE_INVALID
+  };
+
+#define FE_ALL_EXCEPT \
+	(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
+
+enum
+  {
+    FE_TONEAREST  =
+#define FE_TONEAREST	(0x0)
+      FE_TONEAREST,
+    FE_TOWARDZERO =
+#define FE_TOWARDZERO	(0x1)
+      FE_TOWARDZERO,
+    FE_DOWNWARD   =
+#define FE_DOWNWARD	(0x2)
+      FE_DOWNWARD,
+    FE_UPWARD     =
+#define FE_UPWARD	(0x3)
+      FE_UPWARD
+  };
+
+
+typedef unsigned int fexcept_t;
+typedef unsigned int fenv_t;
+
+/* If the default argument is used we use this value.  */
+#define FE_DFL_ENV	((__const fenv_t *) -1)
+
+#if __GLIBC_USE (IEC_60559_BFP_EXT)
+/* Type representing floating-point control modes.  */
+typedef unsigned int femode_t;
+
+/* Default floating-point control modes.  */
+# define FE_DFL_MODE	((const femode_t *) -1L)
+#endif