riscv64 libc

asm defines, copied from aarch64.

diff --git a/lib/libc/arch/riscv64/DEFS.h b/lib/libc/arch/riscv64/DEFS.h
new file mode 100644 (file)
index 0000000..90e5eec
--- /dev/null
+++ b/lib/libc/arch/riscv64/DEFS.h
@@ -0,0 +1,60 @@
+/*     $OpenBSD: DEFS.h,v 1.1 2021/04/29 18:39:53 drahn Exp $  */
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * William Jolitz.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *     from: @(#)SYS.h 5.5 (Berkeley) 5/7/91
+ *     $NetBSD: SYS.h,v 1.5 2002/06/03 18:30:32 fvdl Exp $
+ */
+
+#include <machine/asm.h>
+
+/*
+ * We define a hidden alias with the prefix "_libc_" for each global symbol
+ * that may be used internally.  By referencing _libc_x instead of x, other
+ * parts of libc prevent overriding by the application and avoid unnecessary
+ * relocations.
+ */
+#define _HIDDEN(x)             _libc_##x
+#define _HIDDEN_ALIAS(x,y)                     \
+       STRONG_ALIAS(_HIDDEN(x),y);             \
+       .hidden _HIDDEN(x)
+#define _HIDDEN_FALIAS(x,y)                    \
+       _HIDDEN_ALIAS(x,y);                     \
+       .type _HIDDEN(x),@function
+
+/*
+ * For functions implemented in ASM that aren't syscalls.
+ *   END_STRONG(x)     Like DEF_STRONG() in C; for standard/reserved C names
+ *   END_WEAK(x)       Like DEF_WEAK() in C; for non-ISO C names
+ */
+#define        END_STRONG(x)   END(x); _HIDDEN_FALIAS(x,x); END(_HIDDEN(x))
+#define        END_WEAK(x)     END_STRONG(x); .weak x
+