Task* Core::load_elf(unsigned int start, unsigned int size)
{
const char* phdr_types[] = { "NULL", "LOAD", "DYNAMIC", "INTERP", "NOTE", "SHLIB", "PHDR" };
Elf32_Ehdr* header = (Elf32_Ehdr*) start;
if(header->e_type != ET_EXEC || header->e_machine != EM_386)
{
#ifdef _DEBUGGING_ELF_LOADER_
printf("load_elf: wrong machine or type\n");
#endif
return NULL;
}
#ifdef _DEBUGGING_ELF_LOADER_
printf("load_elf: entry point is 0x%X\n", header->e_entry);
#endif
VirtualMemoryManager* vmm = new VirtualMemoryManager;
Elf32_Phdr* pheader = (Elf32_Phdr*) (start + header->e_phoff);
Elf32_Phdr* p;
for(p = pheader; p < pheader + header->e_phnum; p++)
{
#ifdef _DEBUGGING_ELF_LOADER_
printf("load_elf: program header element type 0x%x\n", p->p_type);
#endif
if(p->p_type == PT_NULL)
;
else if(p->p_type == PT_LOAD)
{
unsigned int pages = bytes_to_pages(p->p_memsz);
if(p->p_filesz == 0) //FIXME: some bug at alloc_at???
continue;
unsigned int phys = (start + p->p_offset) & 0xFFFFF000;
unsigned int virt = p->p_vaddr & 0xFFFFF000;
unsigned int count = pages;
unsigned int flags = PAGE_PRESENT | PAGE_USER | (p->p_flags & PF_W ? PAGE_WRITABLE : 0);
#ifdef _DEBUGGING_ELF_LOADER_
printf("load_elf: file 0x%X (0x%x bytes) -> virtual 0x%X (0x%x bytes)\n",
p->p_offset, p->p_filesz, p->p_vaddr, p->p_memsz);
printf("load_elf: flags = 0x%x, align = 0x%x\n", p->p_flags, p->p_align);
printf("load_elf: mapping 0x%X to 0x%X: %i pages, %s\n", phys, virt, count,
flags & PAGE_WRITABLE ? "writable" : "read only");
#endif
vmm->alloc_at(phys, virt, count, flags, true, "ELF PT_LOAD segment");
}
else
{
#ifdef _DEBUGGING_ELF_LOADER_
printf("load_elf: unknown section type\n");
#endif
}
}
Task* task = hal->taskman->create_task(3, header->e_entry, 1, vmm);
task->image = (void*) start;
return task;
}
unsigned int exec_syscall(Registers r)
{
void* image = hal->mm->alloc(bytes_to_pages(r.ebx));
memcpy(image, (void*) r.ecx, r.ebx);
Task* task = core->load_executable((unsigned int) image, r.ebx, NULL);
if(!task)
return 0;
else
{
task->tss->eflags |= 0x3000;
task->wait_reason = wrNone;
return task->index;
}
}
os_word round_bytes_to_page_size(os_word bytes) {
return GC_PAGE_SIZE * bytes_to_pages(bytes);
}
