From 5ad57f9262c0445c3b59e88a3b17893f7e8f81ee Mon Sep 17 00:00:00 2001
From: xolatile <xolatile@proton.me>
Date: Thu, 11 Jul 2024 11:03:44 -0400
Subject: [PATCH] Finished ELF header black magic...

---
 source/unix.c | 68 ++++++++++++++++++++++++++++++++++++++-------------
 source/unix.h | 23 +++++++++++++----
 2 files changed, 69 insertions(+), 22 deletions(-)

diff --git a/source/unix.c b/source/unix.c
index f43657a..fc6fbbf 100644
--- a/source/unix.c
+++ b/source/unix.c
@@ -1,17 +1,9 @@
 #include "unix.h"
 
-static const uint16_t main_header_size = 0x40;
-static const uint16_t text_sector_size = 0x38;
-static const uint16_t data_sector_size = 0x38;
-
-static const uint16_t full_header_size = main_header_size
-                                       + text_sector_size
-                                       + data_sector_size; // 0xb0
-
 static const uint32_t softcore = 0x1000;   // I DON'T KNOW WHAT IS THIS...
 static const uint32_t hardcore = 0x400000; // I DON'T KNOW WHAT IS THIS...
 
-uint8_t header_bytes [64] = {
+uint8_t main_header_byte [MAIN_HEADER_SIZE] = {
 	0X7F, 0X45, 0X4C, 0X46, 0X02, 0X01, 0X01, 0X03,
 	0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00,
 	0X02, 0X00, 0X3E, 0X00, 0X01, 0X00, 0X00, 0X00,
@@ -22,18 +14,60 @@ uint8_t header_bytes [64] = {
 	0X02, 0X00, 0X40, 0X00, 0X00, 0X00, 0X00, 0X00,
 };
 
-void header (uint8_t  has_program,
-             uint8_t  for_linux,
-             uint8_t  for_x86_64,
-             uint64_t entry_point) {
+uint8_t text_sector_byte [TEXT_SECTOR_SIZE]; = {
+	0X01, 0X00, 0X00, 0X00, 0X05, 0X00, 0X00, 0X00,
+	0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00,
+	0X00, 0X00, 0X40, 0X00, 0X00, 0X00, 0X00, 0X00,
+	0X00, 0X00, 0X40, 0X00, 0X00, 0X00, 0X00, 0X00,
+	0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, // HDR + TXT
+	0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, // HDR + TXT
+	0X00, 0X10, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00,
+};
+
+uint8_t data_sector_byte [DATA_SECTOR_SIZE] = {
+	0X01, 0X00, 0X00, 0X00, 0X06, 0X00, 0X00, 0X00,
+	0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, // HDR + TXT
+	0X00, 0X10, 0X40, 0X00, 0X00, 0X00, 0X00, 0X00, // +++ ^
+	0X00, 0X10, 0X40, 0X00, 0X00, 0X00, 0X00, 0X00, // +++ ^
+	0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, // DAT
+	0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00, // DAT
+	0X00, 0X10, 0X00, 0X00, 0X00, 0X00, 0X00, 0X00,
+};
+
+void main_header (uint8_t  has_program,
+                  uint8_t  for_linux,
+                  uint8_t  for_x86_64,
+                  uint64_t entry_point) {
 	/* */
 	uint64_t enter = entry_point; // TEST
 
-	header_bytes [16] = (has_program) ? 0x02 : 0x03; // else linkable
-	header_bytes [ 7] = (for_linux)   ? 0x03 : 0x00; // else system v
-	header_bytes [18] = (for_x86_64)  ? 0x3e : 0x00; // else ?
+	main_header_bytes [16] = (has_program) ? 0x02 : 0x03; // else linkable
+	main_header_bytes [ 7] = (for_linux)   ? 0x03 : 0x00; // else system v
+	main_header_bytes [18] = (for_x86_64)  ? 0x3e : 0x00; // else ?
 
 	if (entry_point != 0) {
-		memcpy (& header_bytes [24], & enter, 8);
+		memcpy (& main_header_bytes [24], & enter, sizeof (enter));
 	}
 }
+
+void text_sector (uint64_t text_size) {
+	/* */
+	uint64_t text = text_size; // TEST
+
+	memcpy (& text_sector_byte [32], & text, sizeof (text));
+	memcpy (& text_sector_byte [40], & text, sizeof (text));
+}
+
+void data_sector (uint64_t text_size,
+                  uint64_t data_size) {
+	/* */
+	uint64_t data = data_size; // TEST
+	uint64_t main = HEADER_SIZE + text_size;
+	uint64_t move = 0x401000 + main;
+
+	memcpy (& data_sector_byte [ 8], & main, sizeof (main));
+	memcpy (& data_sector_byte [16], & move, sizeof (move));
+	memcpy (& data_sector_byte [24], & move, sizeof (move));
+	memcpy (& data_sector_byte [32], & data, sizeof (data));
+	memcpy (& data_sector_byte [40], & data, sizeof (data));
+}
diff --git a/source/unix.h b/source/unix.h
index 61c0278..4c87520 100644
--- a/source/unix.h
+++ b/source/unix.h
@@ -1,9 +1,22 @@
 #include <stdint.h>
 #include <string.h>
 
-extern uint8_t elf_header_bytes [64];
+#define MAIN_HEADER_SIZE (0x40)
+#define TEXT_SECTOR_SIZE (0x38)
+#define DATA_SECTOR_SIZE (0x38)
 
-extern void header (uint8_t  has_program,
-                    uint8_t  for_linux,
-                    uint8_t  for_x86_64,
-                    uint64_t entry_point);
+#define HEADER_SIZE (MAIN_HEADER_SIZE + TEXT_SECTOR_SIZE + DATA_SECTOR_SIZE)
+
+extern uint8_t main_header_byte [MAIN_HEADER_SIZE];
+extern uint8_t text_sector_byte [TEXT_SECTOR_SIZE];
+extern uint8_t data_sector_byte [DATA_SECTOR_SIZE];
+
+extern void main_header (uint8_t  has_program,
+                         uint8_t  for_linux,
+                         uint8_t  for_x86_64,
+                         uint64_t entry_point);
+
+extern void text_sector (uint64_t text_size);
+
+extern void data_sector (uint64_t text_size,
+                         uint64_t data_size);