From 2ff8267af303d9a94d13bcfafeeaa2fcafcac9a2 Mon Sep 17 00:00:00 2001
From: Kelvin Sherlock <ksherlock@gmail.com>
Date: Thu, 12 Jan 2017 20:56:09 -0500
Subject: [PATCH] beginning support for SUPER relocation records.

---
 omf.cpp | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 omf.h   | 27 +++++++++++++++++++++++++
 2 files changed, 89 insertions(+), 1 deletion(-)

diff --git a/omf.cpp b/omf.cpp
index b6fcc86..6104f8d 100644
--- a/omf.cpp
+++ b/omf.cpp
@@ -8,7 +8,7 @@
 #include <fcntl.h>
 #include <err.h>
 #include <sysexits.h>
-
+#include <assert.h>
 
 #ifndef O_BINARY
 #define O_BINARY 0
@@ -86,6 +86,67 @@ void push(std::vector<uint8_t> &v, const std::string &s) {
 	v.insert(v.end(), s.begin(), s.end());
 }
 
+class super_reloc {
+
+	std::vector<uint8_t> _data;
+	uint32_t _page = 0;
+	int _count = 0;
+
+	super_reloc(unsigned type) {
+		_data.push_back(0xf7);
+		_data.push_back(0x00);
+		_data.push_back(0x00);
+		_data.push_back(0x00);
+		_data.push_back(0x00);
+		_data.push_back(type);
+	}
+
+	void append(uint32_t pc) {
+		unsigned offset = pc & 0xff;
+		unsigned page = pc >> 8;
+		assert(page >= _page);
+
+		if (page != _page) {
+			unsigned skip = page - _page;
+			if (skip > 1) _data.push_back(0x80 | skip);
+			_page = page;
+			_count = 0;
+			_data.push_back(0); // count-1 place holder.
+		}
+
+		_data[_data.size() - _count - 1] = _count; // count is count - 1 at this point,
+		_data.push_back(offset);
+		++_count;
+	}
+
+	std::vector<uint8_t> &&finish() {
+		uint32_t size = _data.size() - 5;
+		_data[1] = size & 0xff; size >>= 8;
+		_data[2] = size & 0xff; size >>= 8;
+		_data[3] = size & 0xff; size >>= 8;
+		_data[4] = size & 0xff; size >>= 8;
+
+		return std::move(_data);
+	}
+
+};
+
+#if 0
+compress() {
+
+
+	for(auto &r : s.reloc) {
+		// super reloc 2 -- size = 2, shift = 0
+		// super reloc 2 -- size = 3, shift = 0
+
+		if (r.size == 2 && r.shift == 0) {
+
+		}
+
+	}
+
+}
+#endif
 
 void save_omf(std::vector<omf::segment> &segments, bool expressload, const std::string &path) {
 
diff --git a/omf.h b/omf.h
index b048f54..5580118 100644
--- a/omf.h
+++ b/omf.h
@@ -7,6 +7,33 @@
 
 namespace omf {
 
+	enum opcode : uint8_t {
+		END = 0x00,
+		// 0x01-0xdf CONST
+		ALIGN = 0xe0,
+		ORG = 0xe1,
+		RELOC = 0xe2,
+		INTERSEG = 0xe3,
+		USING = 0xe4,
+		STRONG = 0xe5,
+		GLOBAL = 0xe6,
+		GEQU = 0xe7,
+		MEM = 0xe8,
+		EXPR = 0xeb,
+		ZEXPR = 0xec,
+		BEXPR = 0xed,
+		RELEXPR = 0xee,
+		LOCAL = 0xef,
+		EQU = 0xf0,
+		DS = 0xf1,
+		LCONST = 0xf2,
+		LEXPR = 0xf3,
+		ENTRY = 0xf4,
+		cRELOC = 0xf5,
+		cINTERSEG = 0xf6,
+		SUPER = 0xf7,
+	};
+
 	struct reloc {
 		uint8_t size = 0;
 		uint8_t shift = 0;