disp8: Consolidate a logic to get compressed displacement

Consolidated two separate but similar functions in nasm and ndisasm
into a commonly linked source code.
To encode and decode the compressed displacement (disp8*N) for EVEX,
N value should be derived using various conditions.

Signed-off-by: Jin Kyu Song <jin.kyu.song@intel.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/disp8.h b/disp8.h
new file mode 100644
index 0000000..fc18e4f
--- /dev/null
+++ b/disp8.h
@@ -0,0 +1,45 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 1996-2013 The NASM Authors - All Rights Reserved
+ *   See the file AUTHORS included with the NASM distribution for
+ *   the specific copyright holders.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following
+ *   conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * 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.
+ *
+ *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * disp8.h   header file for disp8.c
+ */
+
+#ifndef NASM_DISP8_H
+#define NASM_DISP8_H
+
+#include "nasm.h"
+
+uint8_t get_disp8N(insn *ins);
+bool is_disp8n(operand *input, insn *ins, int8_t *compdisp);
+#endif  /* NASM_DISP8_H */