tools: add elf tool

tools/main.c

@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "elf.h"
+
+int main(int argc, char** argv)
+{
+	FILE* fp;
+	long file_size;
+
+	fp = fopen("testfile", "rb");
+
+	fseek(fp, 0, SEEK_END);
+	file_size = ftell(fp);
+	fseek(fp, 0, SEEK_SET);
+	printf("size: %d!!\n", file_size);
+	
+	uint8_t* file = (uint8_t*)malloc(file_size);
+
+	fread(file, 1, file_size, fp);
+
+	Elf32_Ehdr *elf_ehdr = (Elf32_Ehdr*)file;
+
+	int program_header_table_entry_count = elf_ehdr->e_phnum;
+	int program_header_table_entry_size = elf_ehdr->e_phentsize;
+
+	printf("magic: %s, type: %d, entry: 0x%X\n", elf_ehdr->e_ident, elf_ehdr->e_type, elf_ehdr->e_entry);
+	printf("PHNUM: %d\n", program_header_table_entry_count);
+	printf("PHENTSIZE: %d\n\n", program_header_table_entry_size);
+
+	for(int i = 0; i < program_header_table_entry_count; i++)
+	{
+		Elf32_Phdr *elf_phdr = (Elf32_Phdr *)((uint32_t)file + elf_ehdr->e_phoff +
+                                          i * elf_ehdr->e_phentsize);
+
+		printf("HEADER %d, type: 0x%X, vaddr: 0x%X, paddr: 0x%X, memsz: 0x%X\n", i, elf_phdr->p_type, elf_phdr->p_vaddr, elf_phdr->p_paddr, elf_phdr->p_memsz);
+		if(elf_phdr->p_type != PT_LOAD)
+		{
+			printf("not PT_LOAD, skipping...\n");
+			continue;
+		}
+		int pages_needed = elf_phdr->p_memsz / 0x1000;
+		printf("pages needed: %d\n", pages_needed);
+		///////////////////////////
+		//MAP HERE
+		///////////////////////////
+		
+		//memcpy(elf_phdr->p_vaddr, file+elf_phdr->p_offset, elf_phdr->p_filesz);
+
+		uint32_t file_start = elf_phdr->p_vaddr + elf_phdr->p_filesz;
+		uint32_t file_end = elf_phdr->p_vaddr + pages_needed * 0x1000;
+		//memset(file_start, 0, file_end - file_start);
+
+		printf("p_filesz: 0x%X (%d)\n", elf_phdr->p_filesz, elf_phdr->p_filesz);
+		
+		
+
+		printf("================================\n\n\n\n");
+	}
+
+	fclose(fp);
+	free(file);
+	return 0;
+}