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#include "elf.h"
#include <mem/paging.h>
#include <mem/seg.h>
#include <stdlib.h>
#include <core/sys.h>
int elf_check(uint8_t *data) {
struct elf_ehdr *h = (struct elf_ehdr*)data;
if (h->e_ident[0] == 0x7F && h->e_ident[1] == 'E' && h->e_ident[2] == 'L' && h->e_ident[3] == 'F') return 0;
return 1;
}
thread_entry elf_load(uint8_t *data, struct process* process) {
struct elf_ehdr *ehdr = (struct elf_ehdr*)data;
struct elf_phdr *phdr;
int i;
if (elf_check(data)) return 0;
pagedir_switch(process->pagedir);
phdr = (struct elf_phdr*)((uint8_t*)(data + ehdr->e_phoff));
for (i = 0; i < ehdr->e_phnum; i++) {
if (phdr[i].p_type == PT_LOAD) {
seg_map(simpleseg_make(phdr[i].p_vaddr, phdr[i].p_memsz, (phdr[i].p_flags & PF_W) != 0), process->pagedir, 0);
memcpy((uint8_t*)phdr[i].p_vaddr, data + phdr[i].p_offset, phdr[i].p_filesz);
if (phdr[i].p_memsz > phdr[i].p_filesz) {
memset((uint8_t*)phdr[i].p_vaddr + phdr[i].p_memsz, 0, phdr[i].p_memsz - phdr[i].p_filesz);
}
}
}
return (thread_entry)ehdr->e_entry;
}
struct process* elf_exec(uint8_t *data, int privilege) {
if (elf_check(data)) return 0;
struct process* p = process_new(0, 0, privilege);
thread_entry e = elf_load(data, p);
thread_new(p, e, 0);
return p;
}
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