mirror of https://github.com/vivier/EMILE.git
90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <elf.h>
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#include "zlib.h"
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gzFile ZEXPORT gzopen (char*, char*);
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#define PAGE_SHIFT 12
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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int main(int argc, char **argv)
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{
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gzFile in;
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Elf32_Ehdr elf_header;
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Elf32_Phdr *program_header;
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unsigned long min_addr, max_addr, kernel_size;
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int i;
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char * base;
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in = gzopen("vmlinux.gz", "rb");
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gzread(in, &elf_header, sizeof(Elf32_Ehdr));
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if (elf_header.e_machine != EM_68K)
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{
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fprintf(stderr, "Not MC680x0 architecture\n");
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return 1;
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}
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if (elf_header.e_type != ET_EXEC)
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{
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fprintf(stderr, "Not an executable file\n");
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return 2;
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}
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program_header = (Elf32_Phdr *)malloc(elf_header.e_phnum *
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sizeof (Elf32_Phdr));
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if (program_header == NULL)
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{
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fprintf(stderr, "Cannot allocate memory\n");
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return 3;
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}
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gzseek(in, elf_header.e_phoff, SEEK_SET);
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gzread(in, program_header, elf_header.e_phnum * sizeof(Elf32_Phdr));
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min_addr = 0xffffffff;
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max_addr = 0;
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for (i = 0; i < elf_header.e_phnum; i++)
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{
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min_addr = (min_addr > program_header[i].p_vaddr) ?
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program_header[i].p_vaddr : min_addr;
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max_addr = (max_addr < program_header[i].p_vaddr + program_header[i].p_memsz) ?
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program_header[i].p_vaddr + program_header[i].p_memsz: max_addr;
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}
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if (min_addr == 0)
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{
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min_addr = PAGE_SIZE;
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program_header[0].p_vaddr += PAGE_SIZE;
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program_header[0].p_offset += PAGE_SIZE;
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program_header[0].p_filesz -= PAGE_SIZE;
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program_header[0].p_memsz -= PAGE_SIZE;
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}
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kernel_size = max_addr - min_addr;
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fprintf(stderr, "Kernel memory footprint: %ld\n", kernel_size);
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fprintf(stderr, "Base address: 0x%lx\n", min_addr);
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fprintf(stderr, "Entry point: 0x%lx\n", (long)elf_header.e_entry);
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base = (char*)malloc(kernel_size);
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memset(base, 0, kernel_size);
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for (i = 0; i < elf_header.e_phnum; i++)
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{
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fprintf(stderr, "Reading Program Section #%d, "
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"offset 0x%lx, (0x%lx,%lx)\n",
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i, (long)program_header[i].p_offset,
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program_header[i].p_vaddr - PAGE_SIZE,
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(long)program_header[i].p_filesz);
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gzseek(in, program_header[i].p_offset, SEEK_SET);
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gzread(in, base + program_header[i].p_vaddr - PAGE_SIZE,
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program_header[i].p_filesz);
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}
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write(STDOUT_FILENO, base, kernel_size);
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gzclose(in);
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return 0;
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}
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