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// MIT License, Copyright (c) 2020 Marvin Borner
#include <assert.h>
#include <cpu.h>
#include <def.h>
#include <fs.h>
#include <load.h>
#include <mem.h>
#include <proc.h>
#include <str.h>
int bin_load(char *path, struct proc *proc)
{
char *data = vfs_read(path);
u32 stack = (u32)malloc(0x2000) + 0x1000;
proc->regs.ebp = (u32)stack;
proc->regs.useresp = (u32)stack;
proc->regs.eip = (u32)data;
strcpy(proc->name, path + 1);
return data ? 0 : 1;
}
int elf_verify(struct elf_header *h)
{
return h->ident[0] == ELF_MAG && (strncmp((char *)&h->ident[1], "ELF", 3) == 0) &&
h->ident[4] == ELF_32 && h->ident[5] == ELF_LITTLE && h->ident[6] == ELF_CURRENT &&
h->machine == ELF_386 && (h->type == ET_REL || h->type == ET_EXEC);
}
// TODO: Fix elf loading
void elf_load(char *path, struct proc *proc)
{
char *data = vfs_read(path);
struct elf_header *h = (struct elf_header *)data;
if (!elf_verify(h)) {
printf("File is not elf");
return;
}
if (h->type != ET_REL)
return;
struct elf_program_header *phdrs = (struct elf_program_header *)((u32 *)h + h->phoff);
for (int i = 0; i < h->phnum; i++) {
struct elf_program_header *phdr = &phdrs[i];
if (phdr->type != PT_LOAD)
continue;
memcpy((void *)phdr->vaddr, h + phdr->offset, phdr->filesz);
memset((void *)(phdr->vaddr + phdr->filesz), 0, phdr->memsz - phdr->filesz);
}
u32 stack = (u32)malloc(0x1000) + 0x1000;
proc->regs.ebp = (u32)stack;
proc->regs.esp = (u32)stack;
proc->regs.useresp = (u32)stack;
proc->regs.eip = (u32)h->entry;
strcpy(proc->name, path + 1);
}
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