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Finished ELF header black magic...

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This commit is contained in:
xolatile 2024-07-11 11:03:44 -04:00
parent 6e88b65b8c
commit 5ad57f9262
2 changed files with 69 additions and 22 deletions
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68
source/unix.c
View File

@ -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));
}

23
source/unix.h
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@ -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);