Implement decoding of riscv_flush_icache syscall

* linux/riscv/syscallent.h ([259]): Add riscv_flush_icache entry.
* riscv.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* xlat/riscv_flush_icache_flags.in: New file.
* NEWS: Mention it.

Makefile.am

@@ -254,6 +254,7 @@ strace_SOURCES =	\
 	regs.h		\
 	renameat.c	\
 	resource.c	\
+	riscv.c		\
 	rt_sigframe.c	\
 	rt_sigreturn.c	\
 	rtc.c		\

NEWS

@@ -15,6 +15,7 @@ Noteworthy changes in release ?.?? (????-??-??)
   * Enhanced decoding of get_thread_area, memfd_create, modify_ldt,
     perf_event_open, reboot, set_thread_area, and shmget syscalls.
   * Implemented decoding of KVM_* and DM_LIST_DEVICES ioctl commands.
+  * Implemented decoding of riscv_flush_icache syscall.
   * Enhanced decoding of getsockopt and setsockopt syscalls for SOL_NETLINK
     level.
   * Enhanced decoding of BPF_MAP_CREATE command of bpf syscall.

linux/riscv/syscallent.h

@@ -1 +1,4 @@
 #include "64/syscallent.h"
+
+/* #define __NR_riscv_flush_icache (__NR_arch_specific_syscall + 15) */
+[259] = { 3,	TM,		SEN(riscv_flush_icache),	"riscv_flush_icache"	},

riscv.c

@@ -0,0 +1,53 @@
+/*
+ * RISC-V-specific syscall decoders.
+ *
+ * Copyright (c) 2018 The strace developers.
+ * All rights reserved.
+ *
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#include "defs.h"
+
+#ifdef RISCV
+
+# include "xlat/riscv_flush_icache_flags.h"
+
+SYS_FUNC(riscv_flush_icache)
+{
+	/* uintptr_t start */
+	printaddr(tcp->u_arg[0]);
+
+	/* uintptr_t end */
+	tprints(", ");
+	printaddr(tcp->u_arg[1]);
+
+	/* uintptr_t flags */
+	tprints(", ");
+	printflags64(riscv_flush_icache_flags, tcp->u_arg[2],
+		     "SYS_RISCV_FLUSH_ICACHE_???");
+
+	return RVAL_DECODED;
+}
+
+#endif /* RISCV */

xlat/riscv_flush_icache_flags.in

@@ -0,0 +1 @@
+SYS_RISCV_FLUSH_ICACHE_LOCAL 1